U.S. patent application number 16/051496 was filed with the patent office on 2018-11-22 for anti-slugging control method and control apparatus for air-conditioning system, and air-conditioning system.
The applicant listed for this patent is GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD., MIDEA GROUP CO., LTD.. Invention is credited to Weimin XIE.
Application Number | 20180335237 16/051496 |
Document ID | / |
Family ID | 62146046 |
Filed Date | 2018-11-22 |
United States Patent
Application |
20180335237 |
Kind Code |
A1 |
XIE; Weimin |
November 22, 2018 |
ANTI-SLUGGING CONTROL METHOD AND CONTROL APPARATUS FOR
AIR-CONDITIONING SYSTEM, AND AIR-CONDITIONING SYSTEM
Abstract
An anti-slugging control method and control apparatus for an
air-conditioning system. The control method includes obtaining a
discharge superheat DSH of a compressor in real time, and
monitoring the DSH during operation of the air-conditioning system
(S10); controlling a timer to start timing if the DSH is less than
a first preset value M1 continuously for a first preset time t1,
and controlling an outdoor unit of the air-conditioning system to
stop to prevent slugging from occurring in the compressor when a
measured time t of the timer reaches a second preset time t2. The
DSH in the air-conditioning system is monitored in real time, such
that a refrigerant drawn back to an air return port of the
compressor can be ensured to be in a completely gaseous state,
thereby preventing a liquid refrigerant from entering the
compressor and preventing slugging. In addition, because a value of
the discharge superheat is relatively large, it is convenient to
inspect and control data, thereby improving the precision of
anti-slugging control, and operating safety and reliability of the
air-conditioning system.
Inventors: |
XIE; Weimin; (Foshan,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD.
MIDEA GROUP CO., LTD. |
Foshan
Foshan |
|
CN
CN |
|
|
Family ID: |
62146046 |
Appl. No.: |
16/051496 |
Filed: |
August 1, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/CN2017/089642 |
Jun 22, 2017 |
|
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16051496 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25B 2600/0251 20130101;
F25B 2600/01 20130101; F25B 2700/1931 20130101; F25B 2500/19
20130101; F25B 2500/06 20130101; F25B 49/022 20130101; F25B
2700/21152 20130101; F25B 2500/08 20130101; F25B 2600/23 20130101;
F25B 2700/2117 20130101; F25B 2500/28 20130101; F25B 49/02
20130101; F25B 2700/2116 20130101 |
International
Class: |
F25B 49/02 20060101
F25B049/02 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 17, 2016 |
CN |
201611027983.3 |
Nov 17, 2016 |
CN |
201611034105.4 |
Claims
1. A control method for preventing an air conditioning system from
liquid-slugging, comprising: acquiring an drain superheat degree of
a compressor in real time, and monitoring the drain superheat
degree during an operating process of the air conditioning system;
when the drain superheat degree is less than a first preset value
for a first preset time period, controlling a timer to start
timing; and when a counted time period of the timer reaches a
second preset time period, controlling an outdoor unit of the air
conditioning system to shut down for preventing the compressor from
the liquid-slugging.
2. The control method according to claim 1, wherein during a timing
process of the timer, when the drain superheat degree is greater
than or equal to the first preset value for a third preset time
period, resetting the timer and continuing to determine whether the
drain superheat degree satisfies a condition that the timer starts
timing.
3. The control method according to claim 1, after controlling the
outdoor unit to shut down, further comprising: determining whether
a number of anti-liquid-slugging protection activated by the air
conditioning system during a fourth preset time period exceeds a
preset number, wherein, while the number of the
anti-liquid-slugging protection activated by the air conditioning
system during the fourth preset time period exceeds the preset
number, controlling the outdoor unit to be unrecoverable without
being powered off; and while the number of the anti-liquid-slugging
protection activated by the air conditioning system during the
fourth preset time period does not exceed the preset number,
resetting the timer, and controlling the outdoor unit to restart
after a fifth preset time period.
4. The control method according to claim 1, wherein the air
conditioning system comprises the compressor, a condenser and an
evaporator, and acquiring the drain superheat degree of the
compressor in real time comprises: detecting temperature of an air
outlet of the compressor, and detecting temperature of a middle
part of the condenser and temperature of a middle part of the
evaporator; when the air conditioning system is in a refrigerating
mode, calculating the drain superheat degree of the compressor
according to the temperature of the air outlet and the temperature
of the middle part of the condenser; and when the air conditioning
system is in a heating mode, calculating the drain superheat degree
of the compressor according to the temperature of the air outlet
and the temperature of the middle part of the evaporator.
5. The control method according to claim 1, wherein acquiring the
drain superheat degree of the compressor in real time comprises:
detecting a pressure of an air outlet of the compressor and
detecting temperature of the air outlet of the compressor; and
calculating the drain superheat degree of the compressor according
to the pressure of the air outlet and the temperature of the air
outlet.
6. The control method according to claim 3, wherein the first
preset time period is 20 minutes, the second preset time period is
30 minutes, the third preset time period is 5 minutes, the fourth
preset time period is 120 minutes, and the fifth preset time period
is 6 minutes.
7. A non-transitory computer readable storage medium, having
computer programs stored thereon, wherein when the computer
programs are executed by a processor, a control method for
preventing an air conditioning system from liquid-slugging
according to claim 1 is implemented.
8. A control device for preventing an air conditioning system from
liquid-slugging, comprising: an acquiring device, configured to
acquire a drain superheat degree of a compressor in real time; a
monitoring device, configured to monitor the drain superheat degree
during an operating process of the air conditioning system; a
control device, configured to, when the drain superheat degree is
less than a first preset value for a first preset time period,
control a timer to start timing; and when a counted time period of
the timer reaches a second preset time period, control an outdoor
unit of the air conditioning system to shut down for preventing the
compressor from the liquid-slugging.
9. The control device according to claim 8, wherein during a timing
process of the timer, when the drain superheat degree is greater
than or equal to the first preset value for a third preset time
period, the control device is configured to reset the timer and
continue to determine whether the drain superheat degree satisfies
a condition that the timer starts timing.
10. The control method according to claim 8, wherein after the
outdoor unit is controlled to shut down, the control device is
further configured to determine whether a number of
anti-liquid-slugging protection activated by the air conditioning
system during a fourth preset time period exceeds a preset number,
wherein, while the number of the anti-liquid-slugging protection
activated by the air conditioning system during the fourth preset
time period exceeds the preset number, the control device is
configured to control the outdoor unit to be unrecoverable without
being powered off; and while the number of the anti-liquid-slugging
protection activated by the air conditioning system during the
fourth preset time period does not exceed the preset number, the
control device is configured to reset the timer, and control the
outdoor unit to restart after a fifth preset time period.
11. The control device according to claim 8, wherein the air
conditioning system comprises the compressor, a condenser and an
evaporator, and the control device further comprises: a first
temperature sensor arranged at an air outlet of the compressor and
configured to detect temperature of the air outlet of the
compressor; a second temperature sensor arranged at a middle part
of the condenser and configured to detect temperature of the middle
part of the condenser; and a third temperature sensor arranged at a
middle part of the evaporator and configured to detect temperature
of the middle part of the evaporator; wherein the acquiring device
is further configured to calculate the drain superheat degree of
the compressor according to the temperature of the air outlet and
the temperature of the middle part of the condenser when the air
conditioning system is in a refrigerating mode; and to calculate
the drain superheat degree of the compressor according to the
temperature of the air outlet and the temperature of the middle
part of the evaporator when the air conditioning system is in a
heating mode.
12. The control device according to claim 8, further comprising a
fourth temperature sensor and a pressure sensor arranged at an air
outlet of the compressor, wherein the fourth temperature sensor is
configured to detect temperature of the air outlet of the
compressor and the pressure sensor is configured to detect pressure
of the air outlet of the compressor, and the acquiring device is
configured to calculate the drain superheat degree of the
compressor according to the temperature of the air outlet and the
pressure of the air outlet.
13. The control device according to claim 10, wherein the first
preset time period is 20 minutes, the second preset time period is
30 minutes, the third preset time period is 5 minutes, the fourth
preset time period is 120 minutes, and the fifth preset time period
is 6 minutes.
14. An air conditioning system, comprising: a control device for
preventing an air conditioning system from liquid-slugging,
comprising: an acquiring device, configured to acquire a drain
superheat degree of a compressor in real time; a monitoring device,
configured to monitor the drain superheat degree during an
operating process of the air conditioning system; a control device,
configured to, when the drain superheat degree is less than a first
preset value for a first preset time period, control a timer to
start timing; and when a counted time period of the timer reaches a
second preset time period, control an outdoor unit of the air
conditioning system to shut down for preventing the compressor from
the liquid-slugging.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application PCT/CN2017/089642, filed Jun. 22, 2017, which claims
the priority of Chinese Patent Application No. 201611027983.3 and
Chinese Patent Application No. 201611034105.4, both filed with the
State Intellectual Property Office of P. R. China on Nov. 17, 2016,
the entire content of which are incorporated herein by
reference.
FIELD
[0002] The present disclosure relates to the field of air
conditioner technology, and more particularly to a control method
of anti-liquid-slugging of air conditioning system and a control
device of anti-liquid-slugging of air conditioning system, and an
air conditioning system.
BACKGROUND
[0003] In an air conditioning system, several factors, such as too
much refrigerant or lubricating oil, excessive adjustment degree
(opening degree) of expansion valve (or adjusting valve),
instability of thermal load of an evaporator and the like, may
cause that liquid refrigerant enters into an air cylinder of a
compressor, such that the compressor is suffered from
liquid-slugging. As a result, long-time and heavy liquid-slugging
may cause a valve plate of the compressor deformed, broken or even
cause the compressor permanently damaged.
[0004] In related arts, in order to ensure that the refrigerant
sucked back through an air inlet of the compressor is gaseous,
suction superheat degree of the air conditioning system is general
monitored in real time, thereby preventing that the liquid
refrigerant enters into the compressor and avoiding that the
compressor is suffered from the liquid-slugging. However, generally
the value of the suction superheat degree of the air conditioning
system is relatively small, which is not easy to be detected and
controlled. Therefore, an accuracy of anti-liquid-slugging control
of the compressor is relatively low and reliability is poor.
[0005] Therefore, there is a need to improve the control method for
preventing the compressor from the liquid-slugging in the related
arts.
SUMMARY
[0006] Embodiments of the present disclosure seek to solve at least
one of the problems existing in the related art to at least some
extent.
[0007] Embodiments of the present disclosure provide a control
method of anti-liquid-slugging of air conditioning system. The
control method includes acquiring a drain superheat degree of a
compressor in real time, monitoring the drain superheat degree
during an operating process of the air conditioning system; when
the drain superheat degree is less than a first preset value for a
first preset time period, controlling a timer to start timing; and
when a counted time period of the timer reaches a second preset
time period, controlling an outdoor unit of the air conditioning
system to shut down for preventing the compressor from the
liquid-slugging.
[0008] In at least one embodiment, during a timing process of the
timer, when the drain superheat degree is greater than or equal to
the first preset value for a third preset time period, resetting
the timer and continuing to determine whether the drain superheat
degree satisfies a condition that the timer starts timing.
[0009] In at least one embodiment, after controlling the outdoor
unit to shut down, the control method further includes determining
whether a number of anti-liquid-slugging protection activated by
the air conditioning system during a fourth preset time period
exceeds a preset number, while the number of the
anti-liquid-slugging protection activated by the air conditioning
system during the fourth preset time period exceeds the preset
number, controlling the outdoor unit to be unrecoverable without
being powered off; and while the number of the anti-liquid-slugging
protection activated by the air conditioning system during the
fourth preset time period does not exceed the preset number,
resetting the timer, and controlling the outdoor unit to restart
after a fifth preset time period.
[0010] In at least one embodiment, the air conditioning system
includes the compressor, a condenser and an evaporator, and
acquiring the drain superheat degree of the compressor in real time
includes: detecting temperature of an air outlet of the compressor,
and detecting temperature of a middle part of the condenser and
temperature of a middle part of the evaporator; when the air
conditioning system is in a refrigerating mode, calculating the
drain superheat degree of the compressor according to the
temperature of the air outlet and the temperature of the middle
part of the condenser; and when the air conditioning system is in a
heating mode, calculating the drain superheat degree of the
compressor according to the temperature of the air outlet and the
temperature of the middle part of the evaporator.
[0011] In at least one embodiment, acquiring the drain superheat
degree of the compressor in real time includes: detecting a
pressure of an air outlet of the compressor and detecting
temperature of the air outlet of the compressor; and calculating
the drain superheat degree of the compressor according to the
pressure of the air outlet and the temperature of the air
outlet.
[0012] In at least one embodiment, the first preset time period may
be 20 minutes, the second preset time period may be 30 minutes, the
third preset time period may be 5 minutes, the fourth preset time
period may be 120 minutes and the fifth preset time period may be 6
minutes.
[0013] With the control method of anti-liquid-slugging of air
conditioning system according to embodiments of the present
disclosure, by acquiring the drain superheat degree of the
compressor in real time, and by monitoring the drain superheat
degree during the operating process of the air conditioning system,
the timer is controlled to start timing when the drain superheat
degree is less than the first preset value for the first preset
time period; and the outdoor unit of the air conditioning system is
controlled to shut down for preventing the compressor from the
liquid-slugging when the counted time period of the timer reaches
the second preset time period. Therefore, the control method of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure may realize
anti-liquid-slugging protection by monitoring the drain superheat
degree of the compressor in real time, such that it may be ensured
that refrigerant sucked back through an air inlet of the compressor
is gaseous, thereby preventing liquid refrigerant from entering
into the compressor and avoiding the compressor being suffered from
the liquid-slugging. In addition, since the value of the drain
superheat degree is relatively large, which is easy for data
detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0014] Embodiments of the present disclosure provide a
non-transitory computer readable storage medium, having computer
programs stored thereon. When the computer programs are executed by
a processor, the control method of anti-liquid-slugging of air
conditioning system according to embodiments of the present
disclosure are realized.
[0015] Embodiments of the present disclosure provide a control
device of anti-liquid-slugging of air conditioning system. The
control device includes: an acquiring device, configured to acquire
a drain superheat degree of a compressor in real time; a monitoring
device, configured to monitor the drain superheat degree during an
operating process of the air conditioning system; and a control
device, configured to, when the drain superheat degree is less than
a first preset value for a first preset time period, control a
timer to start timing; and when a counted time period of the timer
reaches a second preset time period, control an outdoor unit of the
air conditioning system to shut down for preventing the compressor
from the liquid-slugging.
[0016] In at least one embodiment, during a timing process of the
timer, when the drain superheat degree is greater than or equal to
the first preset value for a third preset time period, the control
device is configured to reset the timer and continue to determine
whether the drain superheat degree satisfies a condition that the
timer starts timing.
[0017] In at least one embodiment, after the outdoor unit is
controlled to shut down, the control device is further configured
to determine, whether a number of anti-liquid-slugging protection
activated by the air conditioning system during a fourth preset
time period exceeds a preset number, while the number of the
anti-liquid-slugging protection activated by the air conditioning
system during the fourth preset time period exceeds the preset
number, the control device is configured to control the outdoor
unit to be unrecoverable without being powered off; and while the
number of the anti-liquid-slugging protection activated by the air
conditioning system during the fourth preset time period does not
exceed the preset number, the control device is configured to reset
the timer, and control the outdoor unit to restart after a fifth
preset time period.
[0018] In at least one embodiment, the air conditioning system
includes the compressor, a condenser and an evaporator, and the
control device further includes: a first temperature sensor
arranged at an air outlet of the compressor and configured to
detect temperature of the air outlet of the compressor; a second
temperature sensor arranged at a middle part of the condenser and
configured to detect temperature of the middle part of the
condenser; and a third temperature sensor arranged at a middle part
of the evaporator and configured to detect temperature of the
middle part of the evaporator; the acquiring device is further
configured to calculate the drain superheat degree of the
compressor according to the temperature of the air outlet and the
temperature of the middle part of the condenser when the air
conditioning system is in a refrigerating mode; and to calculate
the drain superheat degree of the compressor according to the
temperature of the air outlet and the temperature of the middle
part of the evaporator when the air conditioning system is in a
heating mode.
[0019] In at least one embodiment, the control device further
includes a temperature sensor and a pressure sensor arranged at an
air outlet of the compressor, the temperature sensor is configured
to detect temperature of the air outlet of the compressor and the
pressure sensor is configured to detect pressure of the air outlet
of the compressor, and the acquiring device is configured to
calculate the drain superheat degree of the compressor according to
the temperature of the air outlet and the pressure of the air
outlet.
[0020] In at least one embodiment, the first preset time period may
be 20 minutes, the second preset time period may be 30 minutes, the
third preset time period may be 5 minutes, the fourth preset time
period may be 120 minutes and the fifth preset time period may be 6
minutes.
[0021] With the control device of anti-liquid-slugging of air
conditioning system according to embodiments of the present
disclosure, by acquiring the drain superheat degree of the
compressor in real time with the acquiring device, and by
monitoring the drain superheat degree with the monitoring device
during the operating process of the air conditioning system, the
control device is configured to control the timer to start timing
when the drain superheat degree is less than the first preset value
for the first preset time period; and the control device is
configured to control the outdoor unit of the air conditioning
system to shut down for preventing the compressor from the
liquid-slugging when the counted time period of the timer reaches
the second preset time period. Therefore, the control device of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure may realize
anti-liquid-slugging protection by monitoring the drain superheat
degree of the compressor in real time, such that it may be ensured
that refrigerant sucked back through an air inlet of the compressor
is gaseous, thereby preventing liquid refrigerant from entering
into the compressor and avoiding the compressor being suffered from
the liquid-slugging. In addition, since the value of the drain
superheat degree is relatively large, which is easy for data
detection and anti-liquid-slugging control, an accuracy of the
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0022] Embodiments of the present disclosure provide an air
conditioning system. The air conditioning system includes the
control device of anti-liquid-slugging of air conditioning system
according to above embodiments.
[0023] With the air conditioning system according to embodiments of
the present disclosure, an anti-liquid-slugging protection is
realized by monitoring the drain superheat degree of the compressor
in real time with the above control device of anti-liquid-slugging
of air conditioning system, such that it may be ensured that
refrigerant sucked back through an air inlet of the compressor is
gaseous, thereby preventing liquid refrigerant from entering into
the compressor and avoiding the compressor being suffered from the
liquid-slugging. In addition, since the value of the drain
superheat degree is relatively large, which is easy for data
detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is a flow chart illustrating a control method of
anti-liquid-slugging of air conditioning system according to an
embodiment of the present disclosure;
[0025] FIG. 2 is a diagram illustrating a pressure vs enthalpy
curve of an air conditioning system according to an embodiment of
the present disclosure;
[0026] FIG. 3 is a flow chart illustrating a control method of
anti-liquid-slugging of air conditioning system according to
another embodiment of the present disclosure;
[0027] FIG. 4 is a flow chart illustrating a control method of
anti-liquid-slugging of air conditioning system according to one
embodiment of the present disclosure;
[0028] FIG. 5 is a block diagram illustrating a control device of
anti-liquid-slugging of air conditioning system according to an
embodiment of the present disclosure;
[0029] FIG. 6 is a schematic diagram illustrating an air
conditioning system according to an embodiment of the present
disclosure;
[0030] FIG. 7 is a block diagram illustrating a control device of
anti-liquid-slugging of air conditioning system according to
another embodiment of the present disclosure;
[0031] FIG. 8 is a schematic diagram illustrating an air
conditioning system according to another embodiment of the present
disclosure; and
[0032] FIG. 9 is a block diagram illustrating an air conditioning
system according to embodiments of the present disclosure.
REFERENCE NUMERALS
[0033] acquiring device 10, monitoring device 20, control device
30, fourth temperature sensor 40, pressure sensor 50, and timer 60;
[0034] first temperature sensor 70, second temperature sensor 80,
third temperature sensor 90, calculating device 11; [0035]
compressor 100, evaporator 200, condenser 300, air conditioning
system 400, and control device 500 of anti-liquid-slugging of air
conditioning system.
DETAILED DESCRIPTION
[0036] Descriptions will be made in detail to embodiments of the
present disclosure, examples of the embodiments are shown in
drawings, in which the same or similar elements and the elements
having same or similar functions are denoted by like reference
numerals throughout the descriptions. The embodiments described
herein with reference to drawings are explanatory, are intended to
understand the present disclosure, and are not construed to limit
the present disclosure.
[0037] A control method of anti-liquid-slugging of air conditioning
system and a control device of anti-liquid-slugging of air
conditioning system and an air conditioning system provided in
embodiments of the present disclosure will be described with
reference to drawings.
[0038] FIG. 1 is a flow chart illustrating a control method of
anti-liquid-slugging of air conditioning system according to an
embodiment of the present disclosure. As illustrated in FIG. 1, the
control method of anti-liquid-slugging of air conditioning system
includes the followings.
[0039] In block S10, drain superheat degree DSH of a compressor is
acquired in real time, and the drain superheat degree DSH is
monitored during an operating process of an air conditioning
system.
[0040] According to an embodiment of the present disclosure,
acquiring the drain superheat degree DSH of the compressor in real
time includes the following. Pressure P of an air outlet of the
compressor is detected, and temperature Tc of the air outlet of the
compressor is detected. The drain superheat degree DSH of the
compressor is calculated according to the pressure P of the air
outlet and the temperature Tc of the air outlet.
[0041] In one embodiment, based on analysis of the operating
process of the air conditioning system, a pressure vs enthalpy
diagram illustrated in FIG. 2 may be obtained. In the diagram, a
longitudinal coordinate represents a logarithm value LogP of an
absolute pressure of the air conditioning system, while a
horizontal coordinate represents a specific enthalpy value b of the
air conditioning system. As illustrated in FIG. 2, the air
conditioning system is in a superheat and exothermic phase
indicated by segments 1-2, where gaseous refrigerant with high
temperature and high pressure is exhausted from the air outlet of
the compressor. The air conditioning system is in a constant
pressure and exothermic phase indicated by segments 2-4. The air
conditioning system is in a constant pressure and endothermic phase
indicated by segments 5-6. The air conditioning system is in a
superheat and endothermic phase indicated by segments 6-7, where
the refrigerant is sucked back through an air inlet of the
compressor. As illustrated in FIG. 2, the drain superheat degree
DSH of the air conditioning system corresponds to the suction
superheat degree SSH, and the value of the drain superheat degree
DSH is greater than the value of the suction superheat degree SSH.
Therefore, when the drain superheat degree DSH is within a
predetermined range, it may be ensured that the refrigerant sucked
back through the air inlet of the compressor is gaseous.
[0042] During the operating process of the air conditioning system,
the pressure P of the air outlet of the compressor and the
temperature Tc of the air outlet are detected in real time, an
acquiring device may be configured to acquire drain saturation
temperature Tp according to the pressure P of the air outlet of the
compressor detected in real time, and to calculate a difference
between the temperature Tc of the air outlet and the drain
saturation temperature Tp as real-time drain superheat degree DSH.
Therefore, the real-time drain superheat degree DSH may be used for
anti-liquid-slugging control.
[0043] In block S20, when the drain superheat degree DSH is less
than a first preset value M1 for a first preset time period t1, a
timer is controlled to start timing.
[0044] In block S30, when a counted time period t of the timer
reaches a second preset time period t2, an outdoor unit of the air
conditioning system is controlled to shut down for preventing the
compressor from the liquid-slugging.
[0045] According to one embodiment of the present disclosure, the
first preset time period t1 may be 20 minutes, the second preset
time period t2 may be 30 minutes, and the first preset value M1 may
be A.degree. C.
[0046] In one embodiment, the drain superheat degree DSH of the
compressor is acquired in real time, and the drain superheat degree
DSH is monitored during the operating process of the air
conditioning system to determine whether the drain superheat degree
DSH of the air conditioning system is greater than or equal to the
first preset value M1. When the drain superheat degree DSH is
greater than or equal to the first preset value M1 (such as
A.degree. C.), it is indicated that a suction superheat degree SSH
of the air conditioning system is sufficiently large, such that the
outdoor unit of the air conditioning system is controlled to
operate normally. The refrigerant sucked back through the air inlet
of the compressor is gaseous. When the drain superheat degree DSH
is less than the first preset value M1, it is further determined
whether a duration reaches the first preset time period t1 (such as
20 minutes). When the duration reaches the first preset time period
t1, the timer is controlled to start timing.
[0047] Further, it is determined whether the counted time period t
of the timer reaches a second preset time period t2 (such as 30
minutes). When the counted time period t of the timer reaches the
second preset time period t2, that is the duration when the drain
superheat degree DSH is less than the first preset value M1 reaches
a second preset time period t2, it is indicated that the suction
superheat degree SSH of the air conditioning system is relatively
low. The outdoor unit of the air conditioning system is controlled
to shut down for preventing liquid refrigerant from being sucked
back through the air inlet of the compressor and avoiding the
compressor being suffered from the liquid-slugging.
[0048] According to an embodiment of the present disclosure, during
a timing process of the timer, when the drain superheat degree DSH
is greater than or equal to the first preset value M1 for a third
preset time period t3, the timer is reset and the control method
continues to determine whether the drain superheat degree satisfies
a condition that the timer starts timing.
[0049] According to one embodiment of the present disclosure, the
third preset time period t3 may be 5 minutes.
[0050] In one embodiment, during the timing process of the timer,
the drain superheat degree DSH is monitored in real time. When the
drain superheat degree DSH is greater than or equal to the first
preset value M1 (such as A.degree. C.), it is further determined
whether a duration reaches the third preset time period t3 (such as
5 minutes). When the drain superheat degree DSH is greater than or
equal to the first preset value M1 (such as A.degree. C.) for the
third preset time period t3, the timer is reset and it is
determined again whether the drain superheat degree DSH satisfies
the condition that the timer starts timing.
[0051] According to an embodiment of the present disclosure, after
the outdoor unit is controlled to shut down, it is further
determined whether a number N of anti-liquid-slugging protection
activated by the air conditioning system during a fourth preset
time period t4 exceeds a preset number (such as one). While the
number N of the anti-liquid-slugging protection activated by the
air conditioning system during the fourth preset time period t4
exceeds the preset number (such as one), the outdoor unit is
controlled to be unrecoverable without being powered off. While the
number N of the anti-liquid-slugging protection activated by the
air conditioning system during the fourth preset time period t4
does not exceed the preset number (such as one), the timer is
reset, and the outdoor unit is controlled to restart after a fifth
preset time period.
[0052] According to one embodiment of the present disclosure, the
fourth preset time period t4 may be 120 minutes and the fifth
preset time period may be 6 minutes.
[0053] In one embodiment, the number N of the anti-liquid-slugging
protection activated by the air conditioning system (that is, the
number of controlling the outdoor unit to shut down) may be counted
by a counter. While the number N of the anti-liquid-slugging
protection activated by the air conditioning system during the
fourth preset time period t4 (such as 120 minutes) exceeds the
preset number (such as one), it is indicated that the suction
superheat degree SSH of the air conditioning system keeps
continuously relatively low, such that the outdoor unit is
controlled to be unrecoverable without being powered off. That is,
after the outdoor unit is powered off, the outdoor unit can be
recoverably started. While the number N of the anti-liquid-slugging
protection activated by the air conditioning system during the
fourth preset time period t4 (such as 120 minutes) does not exceed
the preset number (such as one), the timer is reset and the outdoor
unit is automatically controlled to restart after the fifth preset
time period t5 (such as 6 minutes), and it is determined again
whether the drain superheat degree DSH satisfies the condition that
the timer starts timing.
[0054] As described above and illustrated in FIG. 4, the control
method of anti-liquid-slugging of air conditioning system according
to embodiments of the present disclosure may specifically include
the following.
[0055] In block S101, the anti-liquid-slugging protection control
is activated.
[0056] In block S102, the drain superheat degree DSH of the
compressor is acquired in real time and the drain superheat degree
DSH is monitored during the operating process of the air
conditioning system.
[0057] In block S103, it is determined whether the drain superheat
degree DSH is less than the first preset value M1.
[0058] If yes, a block S104 is executed. If no, a block S105 is
executed.
[0059] In block S104, it is determined whether a duration reaches
the first preset time period t1.
[0060] If yes, a block S106 is executed. If no, the block S103 is
executed.
[0061] In block S105, the outdoor unit of the air conditioning
system is controlled to operate normally.
[0062] In block S106, the timer is controlled to start timing.
[0063] In block S107, it is determined whether the drain superheat
degree DSH is greater than or equal to the first preset value
M1.
[0064] If yes, a block S108 is executed. If no, a block S110 is
executed.
[0065] In block S108, it is determined whether a duration reaches
the third preset time period t3.
[0066] If yes, a block S109 is executed. If no, the block S107 is
executed.
[0067] In block S109, the timer is reset and the block S102 is
executed.
[0068] In block S110, it is determined whether the counted time
period t of the timer reaches the second preset time period t2.
[0069] If yes, a block S111 is executed. If no, the block S107 is
executed.
[0070] In block S111, the outdoor unit of the air conditioning
system is controlled to shut down.
[0071] In block S112, it is determined whether the number N of the
anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 exceeds the preset number
(such as one).
[0072] If yes, a block S113 is executed. If no, a block S114 is
executed.
[0073] In block S113, the outdoor unit is controlled to be
unrecoverable without being powered off.
[0074] In block S114, the timer is reset, and the outdoor unit is
controlled to restart after the fifth preset time period t5, and
the block S102 is executed.
[0075] In block S115, the anti-liquid-slugging control ends.
[0076] In conclusion, with the control method of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure, by acquiring the drain
superheat degree of the compressor in real time, and by monitoring
the drain superheat degree during the operating process of the air
conditioning system, the timer is controlled to start timing when
the drain superheat degree is less than the first preset value for
the first preset time period; and the outdoor unit of the air
conditioning system is controlled to shut down for preventing the
compressor from the liquid-slugging when the counted time period of
the timer reaches the second preset time period. Therefore, the
control method of anti-liquid-slugging of air conditioning system
according to embodiments of the present disclosure may realize
anti-liquid-slugging protection by monitoring the drain superheat
degree of the compressor in real time, such that it may be ensured
that refrigerant sucked back through an air inlet of the compressor
is gaseous, thereby preventing liquid refrigerant from entering
into the compressor and avoiding the compressor being suffered from
the liquid-slugging. In addition, since the value of the drain
superheat degree is relatively large, which is easy for data
detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0077] FIG. 3 is a flow chart illustrating a control method of
anti-liquid-slugging of air conditioning system according to
another embodiment of the present disclosure. The air conditioning
system includes the compressor, a condenser and an evaporator. As
illustrated in FIG. 3, the control method of anti-liquid-slugging
of air conditioning system includes the followings.
[0078] In block S1, temperature Tc of an air outlet of the
compressor is detected and temperature T1 of a middle part of the
condenser and temperature T2 of a middle part of the evaporator are
detected.
[0079] In block S2, when the air conditioning system is in a
refrigerating mode, the drain superheat degree DSH of the
compressor is calculated according to the temperature Tc of the air
outlet and the temperature T1 of the middle part of the
condenser.
[0080] In block S3, when the air conditioning system is in a
heating mode, the drain superheat degree DSH of the compressor is
calculated according to the temperature Tc of the air outlet and
the temperature T2 of the middle part of the evaporator.
[0081] In one embodiment, based on analysis of the operating
process of the air conditioning system, a pressure vs enthalpy
diagram illustrated in FIG. 2 may be obtained. In the diagram, a
longitudinal coordinate represent a logarithm value LogP of an
absolute pressure of the air conditioning system, while a
horizontal coordinate represents a specific enthalpy value b of the
air conditioning system. As illustrated in FIG. 2, the air
conditioning system is in a superheat and exothermic phase
indicated by segments 1-2, where gaseous refrigerant with high
temperature and high pressure is exhausted from the air outlet of
the compressor. The air conditioning system is in a constant
pressure and exothermic phase indicated by segments 2-4. The air
conditioning system is in a constant pressure and endothermic phase
indicated by segments 5-6. The air conditioning system is in a
superheat and endothermic phase indicated by segments 6-7, where
the refrigerant is sucked back through an air inlet of the
compressor. As illustrated in FIG. 2, the drain superheat degree
DSH of the air conditioning system corresponds to the suction
superheat degree SSH, and the value of the drain superheat degree
DSH is greater than the value of the suction superheat degree SSH.
Therefore, when the drain superheat degree DSH is within a
predetermined range, it may be ensured that the refrigerant sucked
back through the air inlet of the compressor is gaseous.
[0082] During the operating process of the air conditioning system,
the temperature Tc of the air outlet of the compressor is detected
in real time, and the temperature T1 of the middle part of the
condenser and the temperature T2 of the middle part of the
evaporator are detected. When the air conditioning system is in the
refrigerating mode, the temperature T1 of the middle part of the
condenser is equivalent to saturation temperature at a high
pressure side of the air conditioning system. That is, the
temperature T1 of the middle part of the condenser may be
determined as drain saturation temperature. Therefore, the drain
superheat degree DSH of the compressor may be nearly represented as
a difference (Tc-T1) between the temperature Tc of the air outlet
of the compressor and the temperature T1 of the middle part of the
condenser. When the air conditioning system is in the heating mode,
the temperature T2 of the middle part of the evaporator is
equivalent to the saturation temperature at the high pressure side
of the air conditioning system. That is, the temperature T2 of the
middle part of the evaporator may be determined as the drain
saturation temperature. Therefore, the drain superheat degree DSH
of the compressor may be nearly represented as a difference (Tc-T2)
between the temperature Tc of the air outlet of the compressor and
the temperature T2 of the middle part of the evaporator. Further,
the real-time drain superheat degree DSH may be used for
anti-liquid-slugging control.
[0083] In block S4, the drain superheat degree DSH is monitored
during the operating process of the air conditioning system.
[0084] In block S5, when the drain superheat degree DSH is less
than a first preset value M1 for a first preset time period t1, the
timer is controlled to start timing. When a counted time period t
of the timer reaches a second preset time period t2, an outdoor
unit of the air conditioning system is controlled to shut down for
preventing the compressor from liquid-slugging.
[0085] According to one embodiment of the present disclosure, the
first preset time period t1 may be 20 minutes, the second preset
time period t2 may be 30 minutes and the first preset value M1 may
be A.degree. C.
[0086] In one embodiment, the drain superheat degree DSH of the
compressor is acquired in real time, and the drain superheat degree
DSH is monitored during the operating process of the air
conditioning system to determine whether the drain superheat degree
DSH of the air conditioning system is greater than or equal to the
first preset value M1. When the drain superheat degree DSH is
greater than or equal to the first preset value M1 (such as
A.degree. C.), it is indicated that the suction superheat degree
SSH of the air conditioning system is sufficiently large. The
outdoor unit of the air conditioning system keeps operating
normally and the refrigerant sucked back through the air inlet of
the compressor is gaseous. When the drain superheat degree DSH is
less than the first preset value M1, it is further determined
whether a duration reaches the first preset time period t1 (such as
20 minutes). When the duration reaches the first preset time period
t1, the timer is controlled to start timing.
[0087] Further, it is determined whether the counted time period t
of the timer reaches the second preset time period t2 (such as 30
minutes). When the counted time period t of the timer reaches the
second preset time period t2, that is the duration when the drain
superheat degree DSH is less than the first preset value M1 reaches
the second preset time period t2, it is indicated that the suction
superheat degree SSH of the air conditioning system is relatively
low. Therefore, the outdoor unit of the air conditioning system is
controlled to shut down for preventing liquid refrigerant from
being sucked back through the air inlet of the compressor and
avoiding the compressor being suffered from the
liquid-slugging.
[0088] According to an embodiment of the present disclosure, during
the timing process of the timer, when the drain superheat degree
DSH is greater than or equal to the first preset value M1 for a
third preset time period t3, the timer is reset, and the control
method continues to determine whether the drain superheat degree
DSH satisfies a condition that the timer starts timing.
[0089] According to one embodiment of the present disclosure, the
third preset time period t3 may be 5 minutes.
[0090] In one embodiment, during the timing process of the timer,
the drain superheat degree DSH is monitored in real time. When the
drain superheat degree DSH is greater than or equal to the first
preset value M1 (such as A.degree. C.), it is further determined
whether the duration reaches the third preset time period t3 (such
as 5 minutes). When the drain superheat degree DSH is greater than
or equal to the first preset value M1 (such as A.degree. C.) for
the third preset time period t3, the timer is reset and it is
determined again whether the drain superheat degree DSH satisfies
the condition that the timer starts timing.
[0091] According to an embodiment of the present disclosure, after
the outdoor unit is controlled to shut down, it is further
determined whether a number N of anti-liquid-slugging activated by
the air conditioning system during a fourth preset time period t4
exceeds a preset number (such as one). While the number N of the
anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 exceeds the preset number
(such as one), the outdoor unit is controlled to be unrecoverable
without being powered off. While the number N of the
anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 does not exceed the preset
number (such as one), the timer is reset and the outdoor unit is
controlled to restart after a fifth preset time period t5.
[0092] According to one embodiment of the present disclosure, the
fourth preset time period t4 may be 120 minutes, and the fifth
preset time period t5 may be 6 minutes.
[0093] In one embodiment, the number N of the anti-liquid-slugging
activated by the air conditioning system (i.e., the number of
controlling the outdoor unit to shut down) may be counted via a
counter. While the number N of the anti-liquid-slugging activated
by the air conditioning system during the fourth preset time period
t4 (such as 120 minutes) exceeds the preset number (such as one),
it is indicated that the suction superheat degree SSH of the air
conditioning system keeps continuously relatively low, such that
the outdoor unit is unrecoverable without being powered off. That
is, after the outdoor unit is powered off, the outdoor unit can be
recoverably started. While the number N of the anti-liquid-slugging
activated by the air conditioning system during the fourth preset
time period t4 (such as 120 minutes) does not exceed the preset
number (such as one), the timer is reset and the outdoor unit is
automatically controlled to restart after the fifth preset time
period t5 (such as 6 minutes). In addition, it is determined again
whether the drain superheat degree DSH satisfies the condition that
the timer starts timing.
[0094] As described above and illustrated in FIG. 4, the control
method of anti-liquid-slugging of air conditioning system according
to embodiments of the present disclosure may specifically include
the following.
[0095] In block S101, the anti-liquid-slugging protection control
is activated.
[0096] In block S102, the drain superheat degree DSH of the
compressor is acquired in real time and the drain superheat degree
DSH is monitored during the operating process of the air
conditioning system.
[0097] In block S103, it is determined whether the drain superheat
degree DSH is less than the first preset value M1.
[0098] If yes, a block S104 is executed. If no, a block S105 is
executed.
[0099] In block S104, it is determined whether a duration reaches
the first preset time period t1.
[0100] If yes, a block S106 is executed. If no, the block S103 is
executed.
[0101] In block S105, the outdoor unit of the air conditioning
system is controlled to operate normally.
[0102] In block S106, the timer is controlled to start timing.
[0103] In block S107, it is determined whether the drain superheat
degree DSH is greater than or equal to the first preset value
M1.
[0104] If yes, a block S108 is executed. If no, a block S110 is
executed.
[0105] In block S108, it is determined whether a duration reaches
the third preset time period t3.
[0106] If yes, a block S109 is executed. If no, the block S107 is
executed.
[0107] In block S109, the timer is reset and the block S102 is
executed.
[0108] In block S110, it is determined whether the counted time
period t of the timer reaches the second preset time period t2.
[0109] If yes, a block S111 is executed. If no, the block S107 is
executed.
[0110] In block S111, the outdoor unit of the air conditioning
system is controlled to shut down.
[0111] In block S112, it is determined whether the number N of the
anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 exceeds the preset number
(such as one).
[0112] If yes, a block S113 is executed. If no, a block S114 is
executed.
[0113] In block S113, the outdoor unit is controlled to be
unrecoverable without being powered off.
[0114] In block S114, the timer is reset, and the outdoor unit is
controlled to restart after the fifth preset time period t5, and
the block S102 is executed.
[0115] In block S115, the anti-liquid-slugging control ends.
[0116] In conclusion, with the control method of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure, by detecting the temperature
of the air outlet of the compressor, and by detecting the
temperature of the middle part of the condenser and the temperature
of the middle part of the evaporator, when the air conditioning
system is in the refrigerating mode, the drain superheat degree of
the compressor is calculated according to the temperature of the
air outlet and the temperature of the middle part of the condenser,
and when the air conditioning system is in the heating mode, the
drain superheat degree of the compressor is calculated according to
the temperature of the air outlet and the temperature of the middle
part of the evaporator, by monitoring the drain superheat degree
during the operating process of the air conditioning system, the
timer is controlled to start timing when the drain superheat degree
is less than the first preset value for the first preset time
period; and the outdoor unit of the air conditioning system is
controlled to shut down for preventing the compressor from the
liquid-slugging when the counted time period of the timer reaches
the second preset time period. Therefore, the control method of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure may realize
anti-liquid-slugging protection by monitoring the drain superheat
degree of the compressor in real time, such that it may be ensured
that the refrigerant sucked back through an air inlet of the
compressor is gaseous, thereby preventing liquid refrigerant from
entering into the compressor and avoiding the compressor being
suffered from the liquid-slugging. In addition, since the value of
the drain superheat degree is relatively large, which is easy for
data detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0117] Embodiments of the present disclosure further provide a
non-transitory computer readable storage medium, having computer
programs stored thereon. When the computer programs are executed by
a processor, the control method of anti-liquid-slugging of air
conditioning system according to embodiments of the present
disclosure is realized.
[0118] FIG. 5 is a block diagram illustrating a control device of
anti-liquid-slugging of air conditioning system according to an
embodiment of the present disclosure. As illustrated in FIG. 5, the
control device includes an acquiring device 10, a monitoring device
20 and a control device 30. The acquiring device 10 is configured
to acquire a drain superheat degree DSH of a compressor in real
time. The monitoring device 20 is configured to monitor the drain
superheat degree during an operating process of the air
conditioning system. The control device 30 is configured to control
a timer 60 to start timing when the drain superheat degree is less
than a first preset value M1 for a first preset time period t1, and
to control an outdoor unit of the air conditioning system to shut
down for preventing the compressor from the liquid-slugging when a
counted time period of the timer 60 reaches a second preset time
period t2.
[0119] According to one embodiment of the present disclosure, the
first preset time period t1 may be 20 minutes, the second preset
time period t2 may be 30 minutes and the first preset value M1 may
be A.degree. C.
[0120] In one embodiment, the acquiring device 10 is configured to
acquire the drain superheat degree DSH of the compressor in real
time, the monitoring device 20 is configured to monitor the drain
superheat degree DSH during the operating process of the air
conditioning system, and to determine whether the drain superheat
degree DSH of the air conditioning system is greater than or equal
to the first preset value M1. When the drain superheat degree DSH
is greater than or equal to the first preset value M1 (such as
A.degree. C.), it is indicated that a suction superheat degree SSH
of the air conditioning system is sufficiently large, such that the
control device 30 controls the outdoor unit of the air conditioning
system to keep operating normally. Refrigerant sucked back through
an air inlet of the compressor is gaseous. When the drain superheat
degree DSH is less than the first preset value M1, the control
device 30 is configured to further determine whether a duration
reaches the first preset time period t1 (such as 20 minutes). When
the duration reaches the first preset time period t1, the control
device 30 is configured to control the timer 60 to start
timing.
[0121] Further, the control device 30 is configured to determine
whether a counted time period t of the timer 60 reaches the second
preset time period t2 (such as 30 minutes). When the counted time
period t of the timer 60 reaches the second preset time period t2,
that is the duration when the drain superheat degree DSH is less
than the first preset value M1 reaches the second preset time
period t2, the suction superheat degree SSH of the air conditioning
system is accordingly relatively low, the control device 30 is
configured to control the outdoor unit of the air conditioning
system to shut down for preventing liquid refrigerant from being
sucked back through the air inlet of the compressor, and avoiding
the compressor being suffered from the liquid-slugging.
[0122] According to an embodiment of the present disclosure, as
illustrated in FIG. 6, the control device of anti-liquid-slugging
of air conditioning system further includes a fourth temperature
sensor 40 and a pressure sensor 50 arranged at the air outlet of
the compressor. The fourth temperature sensor 40 is configured to
detect temperature Tc of the air outlet of the compressor, and the
pressure sensor 50 is configured to detect pressure P of the air
outlet of the compressor. The acquiring device 10 is configured to
calculate the drain superheat degree DSH of the compressor
according to the pressure P of the air outlet and the temperature
Tc of the air outlet.
[0123] According to one embodiment of the present disclosure, the
fourth temperature sensor 40 may be a drain temperature sensing
bulb.
[0124] Based on analysis of the operating process of the air
conditioning system, a pressure vs enthalpy diagram illustrated in
FIG. 2 may be obtained. In the diagram, a longitudinal coordinate
represents a logarithm value LogP of an absolute pressure of the
air conditioning system, while a horizontal coordinate represents a
specific enthalpy value b of the air conditioning system. As
illustrated in FIG. 2, the air conditioning system is in a
superheat and exothermic phase indicated by segments 1-2, where
gaseous refrigerant with high temperature and high pressure is
exhausted from the air outlet of the compressor. The air
conditioning system is in a constant pressure and exothermic phase
indicated by segments 2-4. The air conditioning system is in a
constant pressure and endothermic phase indicated by segments 5-6.
The air conditioning system is in a superheat and endothermic phase
indicated by segments 6-7, where the refrigerant is sucked back
through the air inlet of the compressor. As illustrated in FIG. 2,
the drain superheat degree DSH of the air conditioning system
corresponds to the suction superheat degree SSH, and the value of
the drain superheat degree DSH is greater than the value of the
suction superheat degree SSH. Therefore, when the drain superheat
degree DSH is within a predetermined range, it may be ensured that
the refrigerant sucked back through the air inlet of the compressor
is gaseous.
[0125] During the operating process of the air conditioning system,
the pressure P of the air outlet of the compressor and the
temperature Tc of the air outlet are detected in real time, the
acquiring device may be configured to acquire drain saturation
temperature Tp according to the pressure P of the air outlet of the
compressor detected in real time, and to calculate a difference
between the temperature Tc of the air outlet and the drain
saturation temperature Tp as real-time drain superheat degree DSH.
Therefore, the real-time drain superheat degree DSH may be used for
anti-liquid-slugging control.
[0126] According to an embodiment of present disclosure, during a
timing process of the timer 60, when the drain superheat degree DSH
is greater than or equal to the first preset value M1 for a third
preset time period t3, the control device 30 is configured to reset
the timer 60 and continue to determine whether the drain superheat
degree DSH satisfies a condition that the timer 60 starts
timing.
[0127] According to one embodiment of the present disclosure, the
third preset time period t3 may be 5 minutes.
[0128] In one embodiment, during the timing process of the timer
60, the monitoring device 20 is configured to monitor the drain
superheat degree DSH in real time. When the drain superheat degree
DSH is greater than or equal to the first preset value M1 (such as
A.degree. C.), the control device 30 is configured to further
determine whether a duration reaches the third preset time period
t3 (such as 5 minutes). When the drain superheat degree DSH is
greater than or equal to the first preset value M1 (such as
A.degree. C.) for the third preset time period t3, the control
device 30 is configured to reset the timer 60 and determine again
whether the drain superheat degree DSH satisfies the condition that
the timer 60 starts timing.
[0129] According to an embodiment of the present disclosure, after
the outdoor unit is controlled to shut down, the control device 30
is configured to further determine whether a number N of
anti-liquid-slugging activated by the air conditioning system
during a fourth preset time period t4 exceeds a preset number (such
as one). While the number N of the anti-liquid-slugging activated
by the air conditioning system during the fourth preset time period
t4 exceeds the preset number (such as one), the control device 30
is configured to control the outdoor unit to be unrecoverable
without being powered off. While the number N of the
anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 does not exceed the preset
number (such as one), the control device 30 is configured to reset
the timer 60 and control the outdoor unit to restart after a fifth
preset time period t5.
[0130] According to one embodiment of the present disclosure, the
fourth preset time period t4 may be 120 minutes and the fifth
preset time period t5 may be 6 minutes.
[0131] In one embodiment, the number N of the anti-liquid-slugging
activated by the air conditioning system (i.e., the number of
controlling the outdoor unit to shut down) may be counted via a
counter. While the number N of the anti-liquid-slugging activated
by the air conditioning system during the fourth preset time period
t4 exceeds the preset number (such as one), it is indicated that
the suction superheat degree SSH of the air conditioning system
keeps continuously relatively low. The control device 30 is
configured to control the outdoor unit to be unrecoverable without
being powered off. That is, after the outdoor unit is powered off,
the outdoor unit can be recoverably started. While the number N of
the anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 (such as 120 minutes) does
not exceed the preset number (such as one), the control device 30
is configured to reset the timer and automatically control the
outdoor unit to restart after the fifth preset time period t5 (such
as 6 minutes), and determine again whether the drain superheat
degree DSH satisfies the condition that the timer 60 starts
timing.
[0132] In conclusion, according to the control device of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure, by acquiring the drain
superheat degree of the compressor in real time with the acquiring
device, and by monitoring the drain superheat degree with the
monitoring device during the operating process of the air
conditioning system, the control device is configured to control
the timer to start timing when the drain superheat degree is less
than the first preset value for the first preset time period; and
the control device is configured to control the outdoor unit of the
air conditioning system to shut down for preventing the compressor
from the liquid-slugging when the counted time period of the timer
reaches the second preset time period. Therefore, the control
device of anti-liquid-slugging of air conditioning system according
to embodiments of the present disclosure may realize
anti-liquid-slugging protection by monitoring the drain superheat
degree of the compressor in real time, such that it may be ensured
that refrigerant sucked back through an air inlet of the compressor
is gaseous, thereby preventing liquid refrigerant from entering
into the compressor and avoiding the compressor being suffered from
the liquid-slugging. In addition, since the value of the drain
superheat degree is relatively large, which is easy for data
detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0133] FIG. 7 is a block diagram illustrating a control device of
anti-liquid-slugging of air conditioning system according to
another embodiment of the present disclosure. As illustrated in
FIG. 7, the control device includes a first temperature sensor 70,
a second temperature sensor 80, a third temperature sensor 90 and
the acquiring device 10 (i.e., the calculating device 11 in
embodiments illustrated in FIG. 7), the monitoring device 20 and
the control device 30.
[0134] As illustrated in FIG. 8, the first temperature sensor 70 is
arranged at the air outlet of the compressor 100. The first
temperature sensor 70 is configured to detect temperature Tc of the
air outlet of the compressor 10. The second temperature sensor 80
is arranged at a middle part of the evaporator 200, and the second
temperature sensor 80 is configured to detect temperature T1 of the
middle part of the evaporator 200. The third temperature sensor 90
is arranged at a middle part of the condenser 300, and the third
temperature sensor 90 is configured to detect temperature T2 of the
middle part of the condenser 300. The acquiring device 10 (i.e.,
the calculating device 11) is configured to, when the air
conditioning system is in a refrigerating mode, calculate the drain
superheat degree DSH of the compressor 100 according to the
temperature Tc of the air outlet and the temperature T2 of the
middle part of the condenser 300, and when the air conditioning
system is in a heating mode, calculate the drain superheat degree
DSH of the compressor 100 according to the temperature Tc of the
air outlet and the temperature T1 of the middle part of the
evaporator 200. The monitoring device 20 is configured to monitor
the drain superheat degree DSH during the operating process of the
air conditioning system. The control device 30 is configured to
control the timer 60 to start timing when the drain superheat
degree DSH is less than the first preset value M1 for the first
preset time period t1, and control the outdoor unit of the air
conditioning system to shut down for preventing the compressor from
the liquid-slugging when the counted time period t of the timer 60
reaches the second preset time period t2.
[0135] According to one embodiment of the present disclosure, the
first preset time period t1 may be 20 minutes, the second preset
time period t2 may be 30 minutes and the first preset value M1 may
be A.degree. C.
[0136] In one embodiment, during the operating process of the air
conditioning system, the first temperature sensor 70 is configured
to detect the temperature Tc of the air outlet of compressor 100 in
real time, the second temperature sensor 80 is configured to detect
the temperature T1 of the middle part of the condenser 300 in real
time, and the third temperature sensor 90 is configured to detect
the temperature T2 of the evaporator 200 in real time. When the air
conditioning system is in the refrigerating mode, the temperature
T1 of the middle part of the condenser 300 is equivalent to
saturation temperature at a high pressure side of the air
conditioning system. That is, the temperature T1 of the middle part
of the condenser 300 may be determined as drain saturation
temperature. Therefore, the drain superheat degree DSH of the
compressor 100 may be nearly represented as a difference (Tc-T1)
between the temperature Tc of the air outlet of the compressor 100
and the temperature T1 of the middle part of the condenser 300.
When the air conditioning system is in the heating mode, the
temperature T2 of the middle part of the evaporator 200 is
equivalent to the saturation temperature at the high pressure side
of the air conditioning system. That is, the temperature T2 of the
middle part of the evaporator 200 may be determined as the drain
saturation temperature. The drain superheat degree DSH of the
compressor 100 may be nearly represented as a difference (Tc-T2)
between the temperature Tc of the air outlet of the compressor 100
and the temperature T2 of the middle part of the evaporator 200.
The real-time drain superheat degree DSH may be used for
anti-liquid-slugging control.
[0137] As such, when the air conditioning system is in the
refrigerating mode, the calculating device 11 is configured to
calculate the drain superheat degree DSH of the compressor 100
according to the temperature Tc of the air outlet of the compressor
100 and the temperature T1 of the middle part of the condenser 300.
When the air conditioning system is in the heating mode, the
calculating device 11 is configured to calculate the drain
superheat degree DSH of the compressor 100 according to the
temperature Tc of the air outlet of the compressor 100 and the
temperature T2 of the middle part of the evaporator 200. The
monitoring device 20 is configured to monitor the drain superheat
degree DSH during the operating process of the air conditioning
system, and determine whether the drain superheat degree DSH of the
air conditioning system is greater than or equal to the first
preset value M1. When the drain superheat degree DSH is greater
than or equal to the first preset value M1 (such as A.degree. C.),
it is indicated that the suction superheat degree DSH of the air
conditioning system is relatively large. The control device 30 is
configured to control the outdoor unit of the air conditioning
system to keep operating normally. The refrigerant sucked back
through the air inlet of the compressor 100 is gaseous. When the
drain superheat degree DSH is less than the first preset value M1,
the control device 30 is configured to further determine whether a
duration reaches the first preset time period t1 (such as 20
minutes). When the duration reaches the first preset time period
t1, the control device 30 is configured to control the timer 60 to
start timing.
[0138] Further, the control device 30 is configured to determine
whether the counted time period t of the timer 60 reaches the
second preset time period t2 (such as 30 minutes). When the counted
time period t of the timer 60 reaches the second preset time period
t2, that is, the duration when the drain superheat degree DSH is
less than the first preset value M1 reaches the second preset time
period t2, the suction superheat degree SSH of the air conditioning
system is accordingly relatively low, the control device 30 is
configured to control the outdoor unit of the air conditioning
system to shut down for preventing liquid refrigerant from being
sucked back through the air inlet of the compressor 100 and
avoiding the compressor 100 being suffered from the
liquid-slugging.
[0139] According to an embodiment of the present disclosure, during
the timing process of the timer 60, when the drain superheat degree
DSH is greater than the first preset value M1 for the third preset
time period t3, the control device 30 is configured to reset the
timer 60 and continue to determine whether the drain superheat
degree DSH satisfies the condition that the timer 60 starts
timing.
[0140] According to one embodiment of the present disclosure, the
third preset time period t3 may be 5 minutes.
[0141] In one embodiment, during the timing process of the timer
60, the monitoring device 20 is configured to monitor the drain
superheat degree DSH in real time. When the drain superheat degree
DSH is greater than or equal to the first preset value M1 (such as
A.degree. C.), the control device 30 may be configured to further
determine whether a duration reaches the third preset time period
t3 (such as 5 minutes). When the drain superheat degree DSH is
greater than or equal to the first preset value M1 (such as
A.degree. C.) for the third preset time period t3, the control
device 30 is configured to reset the timer 60 and to determine
again whether the drain superheat degree DSH satisfies the
condition that the timer 60 starts timing.
[0142] According to an embodiment of the present disclosure, after
the outdoor unit is controlled to shut down, the control device 30
is further configured to determine whether a number N of
anti-liquid-slugging activated by the air conditioning system
during a fourth preset time period t4 exceeds a preset number (such
as two). While the number N of the anti-liquid-slugging activated
by the air conditioning system during the fourth preset time period
t4 exceeds the preset number (such as two), the control device 30
is configured to control the outdoor unit to be unrecoverable
without being powered off. While the number N of the
anti-liquid-slugging activated by the air conditioning system
during the fourth preset time period t4 does not exceed the preset
number (such as two), the control device 30 is configured to reset
the timer 60 and control the outdoor unit to restart after a fifth
preset time period t5.
[0143] According to one embodiment of the present disclosure, the
fourth preset time period t4 may be 120 minutes, and the fifth
preset time period t5 may be 6 minutes.
[0144] In one embodiment, the number N of the anti-liquid-slugging
activated by the air conditioning system (that is the number of
controlling the outdoor unit to shut down) may be counted by a
counter. While the number N of the anti-liquid-slugging activated
by the air conditioning system during the fourth preset time period
t4 (such as 120 minutes) exceeds the preset number (such as one),
it is indicated that the suction superheat degree SSH of the air
conditioning system keeps continuously relatively low. The control
device 30 is configured to control the outdoor unit to be
unrecoverable without being powered off. That is, it is required to
power the outdoor unit off, and the outdoor unit can be recoverably
started. While the number N of the anti-liquid-slugging activated
by the air conditioning system during the fourth preset time period
t4 (such as 120 minutes) does not exceed the preset number (such as
one), the control device 30 is configured to reset the timer 60 and
automatically control the outdoor unit to restart after the fifth
preset time period t5 (such as 6 minutes), and determine again
whether the drain superheat degree DSH satisfies the condition that
the timer 60 starts timing.
[0145] In conclusion, with the control device of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure, by detecting the temperature
of the air outlet of the compressor with the first temperature
sensor, by detecting the temperature of the middle part of the
evaporator with the second temperature sensor and by detecting the
temperature of the middle part of the condenser with the third
temperature sensor, the drain superheat degree of the compressor is
calculated via the calculating device according to the temperature
of the air outlet and the temperature of the middle part of the
condenser when the air conditioning system is in the refrigerating
mode and the drain superheat degree of the compressor is calculated
via the calculating device according to the temperature of the air
outlet and the temperature of the middle part of the evaporator
when the air conditioning system is in the heating mode. The
monitoring device 20 is configured to monitor the drain superheat
degree during the operating process of the air conditioning system.
The control device is configured to control the timer to start
timing when the drain superheat degree is less than the first
preset value for the first preset time period, and to control the
outdoor unit of the air conditioning system to shut down when the
counted time period of the timer reaches the second preset time
period. As can be seen above, the control device of
anti-liquid-slugging of air conditioning system according to
embodiments of the present disclosure may realize
anti-liquid-slugging protection by monitoring the drain superheat
degree of the compressor in real time, such that it may be ensured
that the refrigerant sucked back through an air inlet of the
compressor is gaseous, thereby preventing liquid refrigerant from
entering into the compressor and avoiding the compressor being
suffered from the liquid-slugging. In addition, since the value of
the drain superheat degree is relatively large, which is easy for
data detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0146] FIG. 9 is a block diagram illustrating an air conditioning
system according to embodiments of the present disclosure. As
illustrated in FIG. 9, the air conditioning system 400 includes the
anti-liquid-slugging device 500 of the air conditioning system.
[0147] In conclusion, with the air conditioning system provided in
embodiments of the present disclosure, an anti-liquid-slugging
protection is realized by monitoring the drain superheat degree of
the compressor in real time with the above control device of
anti-liquid-slugging of air conditioning system, such that it may
be ensured that the refrigerant sucked back through an air inlet of
the compressor is gaseous, thereby preventing liquid refrigerant
from entering into the compressor and avoiding the compressor being
suffered from the liquid-slugging. In addition, since the value of
the drain superheat degree is relatively large, which is easy for
data detection and anti-liquid-slugging control, an accuracy of
anti-liquid-slugging control is improved and security and
reliability during the operating process of the air conditioning
system are improved.
[0148] It is to be noted that, in the specification, relational
terms such as "first" and "second" are used herein for
distinguishing one entity or operation from another entity or
operation, but not necessarily require or imply any such actual
relationship or order existing among these entities or operations.
Moreover, the terms "comprises", "includes" or any other variation
thereof are intended to cover a non-exclusive inclusion, such that
a process, method, article, or device including a serious of
elements includes not only those elements, but also other elements
that are not explicitly listed, or includes inherent elements of
such the process, method, article, or device. Without more
limitation, there is no exclusion that the process, the method, the
article, or the device including an element defined by the sentence
"include one. . ." includes other same elements.
[0149] The logic and/or steps described in other manners herein or
shown in the flow chart, for example, may be considered as a
particular sequence table of executable instructions for realizing
the logical function, may be specifically achieved in any computer
readable medium to be used by the instruction execution system,
device or equipment (such as the system based on computers, the
system comprising processors or other systems capable of obtaining
the instruction from the instruction execution system, device and
equipment and executing the instruction), or to be used in
combination with the instruction execution system, device and
equipment. As to the specification, "the computer readable medium"
may be any device adaptive for including, storing, communicating,
propagating or transferring programs to be used by or in
combination with the instruction execution system, device or
equipment. More specific examples of the computer readable medium
(non-exhaustive list) comprise but are not limited to: an
electronic connection (an electronic device) with one or more
wires, a portable computer enclosure (a magnetic device), a random
access memory (RAM), a read only memory (ROM), an erasable
programmable read-only memory (EPROM or a flash memory), an optical
fiber device and a portable compact disk read-only memory (CDROM).
In addition, the computer readable medium may even be a paper or
other appropriate medium capable of printing programs thereon, this
is because, for example, the paper or other appropriate medium may
be optically scanned and then edited, decrypted or processed with
other appropriate methods when necessary to obtain the programs in
an electric manner, and then the programs may be stored in the
computer memories.
[0150] It should be understood that each part of the present
disclosure may be realized by the hardware, software, firmware or
their combination. In the above embodiments, a plurality of steps
or methods may be realized by the software or firmware stored in
the memory and executed by the appropriate instruction execution
system. For example, if it is realized by the hardware, likewise in
another embodiment, the steps or methods may be realized by one or
a combination of the following techniques known in the art: a
discrete logic circuit having a logic gate circuit for realizing a
logic function of a data signal, an application-specific integrated
circuit having an appropriate combination logic gate circuit, a
programmable gate array (PGA), a field programmable gate array
(FPGA), etc.
[0151] In the present disclosure, unless specified or limited
otherwise, the terms "mounted," "connected," "coupled," and "fixed"
are used broadly and encompass such as fixed, detachable or
integral connections; also can be mechanical or electrical
connections, also can be direct and indirect connections via an
intermediate medium, and further can be internal connections or the
interactions between two elements, unless otherwise expressly
defined which can be understood by that according to the detail
embodiment of the present disclosure.
[0152] In the description of the present disclosure, reference
throughout this specification to "an embodiment", "some
embodiments", "an example", "a specific example" or "some examples"
means that a particular feature, structure, material, or
characteristic described in connection with the embodiment or
example is included in at least one embodiment or example of the
present disclosure. The appearances of the phrases in various
places throughout this specification are not necessarily referring
to the same embodiment or example of the present disclosure.
Furthermore, the particular features, structures, materials, or
characteristics may be combined in any suitable manner in one or
more embodiments or examples. Without a contradiction, the
different embodiments or examples and the features of the different
embodiments or examples can be combined.
* * * * *