U.S. patent application number 16/092175 was filed with the patent office on 2019-05-02 for heat pump unit and multi-functional mode control method.
The applicant listed for this patent is Carrier Corporation. Invention is credited to Jianhua Chen, Jie Chen, Haijun Li, Guangyu Shen.
Application Number | 20190128581 16/092175 |
Document ID | / |
Family ID | 58579291 |
Filed Date | 2019-05-02 |
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United States Patent
Application |
20190128581 |
Kind Code |
A1 |
Li; Haijun ; et al. |
May 2, 2019 |
HEAT PUMP UNIT AND MULTI-FUNCTIONAL MODE CONTROL METHOD
Abstract
A heat pump unit, which comprises: a heat pump system comprising
a compressor, a refrigeration heat exchanger, a heating heat
exchanger, a first heat exchanger, a flow path switching valve and
a throttling element, wherein the throttling dement is arranged on
a flow path between any two of the heat exchangers; and further
comprising a mode switching flow path, wherein a first flow path, a
second flow path and a third flow path are arranged and each flow
path is controllably conducted or disconnected to realize different
functional modes.
Inventors: |
Li; Haijun; (Shanghai,
CN) ; Chen; Jie; (Shanghai, CN) ; Chen;
Jianhua; (Shanghai, CN) ; Shen; Guangyu;
(Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Carrier Corporation |
Palm Beach Gardens |
FL |
US |
|
|
Family ID: |
58579291 |
Appl. No.: |
16/092175 |
Filed: |
April 5, 2017 |
PCT Filed: |
April 5, 2017 |
PCT NO: |
PCT/US2017/026066 |
371 Date: |
October 8, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25B 2400/24 20130101;
F25B 2700/2117 20130101; F25B 2700/1933 20130101; F25B 2313/0316
20130101; F25B 41/04 20130101; F25B 13/00 20130101; F25B 29/003
20130101; F25B 2600/2501 20130101; F25B 2600/2519 20130101; F25B
41/062 20130101; F25B 41/046 20130101; F25B 49/02 20130101; F25B
2400/0409 20130101; F25B 2600/2513 20130101; F24H 4/04 20130101;
F25B 47/022 20130101; F25B 41/043 20130101 |
International
Class: |
F25B 49/02 20060101
F25B049/02; F25B 29/00 20060101 F25B029/00; F25B 41/04 20060101
F25B041/04; F25B 47/02 20060101 F25B047/02; F25B 41/06 20060101
F25B041/06; F24H 4/04 20060101 F24H004/04 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 8, 2016 |
CN |
201610215119.X |
Claims
1. A heat pump unit, comprising: a heat pump system comprising a
compressor, a refrigeration heat exchanger, a heating heat
exchanger, a first heat exchanger, a flow path switching valve
which is capable of switching a flow direction of refrigerant and a
throttling element, wherein the throttling element is arranged on a
flow path between any two of the refrigeration heat exchanger, the
heating heat exchanger and the first heat exchanger; and further
comprising: a mode switching flow path, wherein a first flow path,
a second flow path and a third flow path are arranged in the mode
switching flow path and each flow path is controllably conducted or
disconnected to realize different functional modes, wherein, under
a sole refrigeration mode, a circular flow direction of the
refrigerant is from a gas outlet of the compressor to a gas suction
port of the compressor through the flow path switching valve, the
first heat exchanger, the first flow path of the mode switching
flow path and the refrigeration heat exchanger; and/or under a sole
heating mode, the circular flow direction of the refrigerant is
from the gas outlet of the compressor to the gas suction port of
the compressor through the flow path switching valve, the heating
heat exchanger, the second flow path of the mode switching flow
path, the first heat exchanger and the flow path switching valve;
and/or under a simultaneous refrigeration and heating mode, the
circular flow direction of the refrigerant is from the gas outlet
of the compressor to the gas suction port of the compressor through
the flow path switching valve, the heating heat exchanger, the
third flow path of the mode switching flow path and the
refrigeration heat exchanger; a refrigeration water system
exchanging heat with the refrigeration heat exchanger; and a
heating water system exchanging heat with the heating heat
exchanger.
2. The heat pump unit according to claim 1, wherein the first flow
path comprises a conducted first one-way valve, a throttling
element, a first electromagnetic valve and a conducted second
one-way valve which are sequentially connected; and/or the second
flow path comprises a conducted third one-way valve, a throttling
element, a second electromagnetic valve and a conducted fourth
one-way valve which are sequentially connected; and/or the third
flow path comprises a conducted third one-way valve, a throttling
element, a first electromagnetic valve and a conducted second
one-way valve which are sequentially connected.
3. The heat pump unit according to claim 1, wherein the first flow
path comprises a first one-way valve, a throttling element and a
first valve capable of being fully closed in two ways which are
sequentially connected; and/or the second flow path comprises a
third one-way valve, a throttling element and a second valve
capable of being fully closed in two ways which are sequentially
connected; and/or the third flow path comprises a third one-way
valve, a throttling element and a first valve capable of being
fully closed in two ways which are sequentially connected.
4. The heat pump unit according to claim 1, further comprising a
defrosting branch which is connected with a flow path between an
outlet of the throttling element and an outlet of the heating heat
exchanger; and the defrosting branch is controllably opened or
closed to enable or disable a defrosting function.
5. The heat pump unit according to claim 4, wherein a third
electromagnetic valve and a fifth one-way valve are arranged on the
defrosting branch, wherein the fifth one-way valve is conducted
along a flow direction from the throttling element to the heating
heat exchanger.
6. The heat pump unit according to claim 5, wherein the fifth
one-way valve is arranged downstream of the third electromagnetic
valve.
7. The heat pump unit according to claim 4, wherein a third valve
capable of being fully closed in two ways is arranged on the
defrosting branch.
8. The heat pump unit according to claim 3, wherein the first valve
and/or the second valve and/or the third valve are electric ball
valves.
9. The heat pump unit according to claim 1, further comprising a
fourth electromagnetic valve which is arranged between the flow
path switching valve and a second end of the refrigeration heat
exchanger, and a hot gas bypass branch; wherein the hot gas bypass
branch comprises a first branch section which connects the gas
outlet of the compressor and the second end of the refrigeration
heat exchanger, and a second branch section which connects a first
end of the refrigeration heat exchanger and an inlet of the
throttling element; and the hot gas bypass branch together with the
fourth electromagnetic valve is controllably conducted or
disconnected to enable or disable a hot gas bypass function.
10. The heat pump unit according to claim 9, wherein a fifth
electromagnetic valve is arranged on the first branch section
and/or a sixth one-way valve is arranged on the second branch
section, wherein the sixth one-way valve is conducted along a flow
direction from the refrigeration heat exchanger to the throttling
element.
11. The heat pump unit according to claim 1, wherein the
refrigeration water system comprises a first water loop which is
connected between a refrigeration end and the refrigeration heat
exchanger; and a first driving part which drives water to circulate
in the water loop.
12. The heat pump unit according to claim 1, wherein the heating
water system comprises a second water loop which is connected
between a heating end and the heating heat exchanger; and a second
driving part which drives water to circulate in the water loop.
13. The heat pump unit according to claim 12, wherein the heating
end comprises a heat supply end and/or a sanitary hot water
end.
14. The heat pump unit according to claim 1, wherein the first flow
path and/or the second flow path and/or the third flow path have a
common flow path, and the throttling element is arranged on the
common flow path.
15. The heat pump unit according to claim 14, further comprising a
drier-filter which is arranged on the common flow path and located
upstream of the throttling element.
16. The heat pump unit according to claim 2, further comprising a
liquid reservoir which is arranged between a location downstream of
the heating heat exchanger and the third one-way valve.
17. The heat pump unit according to claim 1, further comprising a
gas-liquid separator which is arranged upstream of the gas suction
port of the compressor.
18. The heat pump unit according to claim 1, wherein the first heat
exchanger is a water-refrigerant heat exchanger or an
air-refrigerant heat exchanger.
19. The heat pump unit according to claim 1, wherein the first heat
exchanger comprises a V-shaped heat exchange coil.
20. The heat pump unit according to claim 1, wherein the flow path
switching valve has a first switching position and a second
switching position; at the first switching position, the gas outlet
of the compressor is connected to the heating heat exchanger
through the flow path switching valve; and/or at the second
switching position, the gas outlet of the compressor is connected
to the first heat exchanger through the flow path switching
valve.
21. The heat pump unit according to claim 1, wherein the compressor
is a scroll compressor or a screw compressor.
22. The heat pump unit according to claim 1, wherein the throttling
element is an electronic expansion valve.
23. The heat pump unit according to claim 4, further comprising a
gas suction pressure sensor which is arranged at the gas suction
port of the compressor and/or a first temperature sensor which is
arranged at the position of the first heat exchanger.
24. The heat pump unit according to claim 9, further comprising a
first pressure sensor which is arranged in the refrigeration heat
exchanger; and/or a liquid level sensor which is arranged in the
refrigeration heat exchanger.
25. A multifunctional mode control method for a heat pump unit,
wherein the heat pump unit comprises a compressor, a refrigeration
heat exchanger, a heating heat exchanger, a first heat exchanger, a
flow path switching valve which is capable of switching a flow
direction of refrigerant and a throttling element, wherein the
throttling element is arranged on a flow path between any two of
the refrigeration heat exchanger, the heating heat exchanger and
the first heat exchanger; and a refrigeration water system and a
heating water system; and further comprises a mode switching flow
path, wherein a first flow path, a second flow path and a third
flow path are arranged in the mode switching flow path, wherein,
during operation in a sole refrigeration mode, the first flow path
of the mode switching flow path is conducted, and the second flow
path and the third flow path of the mode switching flow path are
disconnected; a circular flow direction of the refrigerant is from
a gas outlet of the compressor to a gas suction port of the
compressor through the flow path switching valve, the first heat
exchanger, the first flow path of the mode switching flow path and
the refrigeration heat exchanger; and at this moment, the
refrigeration water system exchanges heat with the refrigeration
heat exchanger; and/or during operation in a sole heating mode, the
second flow path of the mode switching flow path is conducted, and
the first flow path and the third flow path of the mode switching
flow path are disconnected; the circular flow direction of the
refrigerant is from the gas outlet of the compressor to the gas
suction port of the compressor through the flow path switching
valve, the heating heat exchanger, the second flow path of the mode
switching flow path, the first heat exchanger and the flow path
switching valve; and at this moment, the heating water system
exchanges heat with the heating heat exchanger; and/or during
operation in a simultaneous refrigeration and heating mode, the
third flow path of the mode switching flow path is conducted, and
the first flow path and the second flow path of the mode switching
flow path are disconnected; the circular flow direction of the
refrigerant is from the gas outlet of the compressor to the gas
suction port of the compressor through the flow path switching
valve, the heating heat exchanger, the third flow path of the mode
switching flow path and the refrigeration heat exchanger; and at
this moment, the refrigeration water system and the heating water
system respectively exchange heat with the refrigeration heat
exchanger and the heating heat exchanger.
26. The multifunctional mode control method for the heat pump unit
according to claim 25, wherein the heating water system comprises a
heat supply end and/or a sanitary hot water end; the sole heating
mode further comprises a heat supply mode and/or a sanitary hot
water mode; during operation in the heat supply mode, the heat
supply end exchanges heat with the heating heat exchanger; and/or
during operation in the sanitary hot water mode, the sanitary hot
water end exchanges heat with the heating heat exchanger.
27. The multifunctional mode control method for the heat pump unit
according to claim 25, wherein the heating water system comprises a
heat supply end and/or a sanitary hot water end; the simultaneous
refrigeration and heating mode further comprises a simultaneous
refrigeration and heat supply mode and/or a simultaneous
refrigeration and sanitary hot water mode; during operation in the
simultaneous refrigeration and heat supply mode, the heat supply
end exchanges heat with the heating heat exchanger; and/or during
operation in the simultaneous refrigeration and sanitary hot water
mode, the sanitary hot water end exchanges heat with the heating
heat exchanger.
28. The multifunctional mode control method for the heat pump unit
according to claim 25, wherein a first electromagnetic valve and a
second electromagnetic valve are further arranged in the mode
switching flow path; when the first electromagnetic valve is
conducted, the second electromagnetic valve is disconnected, and
when the flow path switching valve is switched to a second
switching position, the first flow path of the mode switching flow
path is conducted and the second flow path and the third flow path
of the mode switching flow path are disconnected; and/or when the
second electromagnetic valve is conducted, the first
electromagnetic valve is disconnected, and when the flow path
switching valve is switched to a first switching position, the
second flow path of the mode switching flow path is conducted and
the first flow path and the third flow path of the mode switching
flow path are disconnected; and/or when the first electromagnetic
valve is conducted, the second electromagnetic valve is
disconnected, and when the flow path switching valve is switched to
a first switching position, the third flow path of the mode
switching flow path is conducted and the first flow path and the
second flow path of the mode switching flow path are
disconnected.
29. The multifunctional mode control method for the heat pump unit
according to claim 25, further comprising a defrosting branch which
is connected between an outlet of the throttling element and an
outlet of the heating heat exchanger; wherein when a defrosting
mode is enabled, the defrosting branch is conducted, the circular
flow direction of the refrigerant is from the gas outlet of the
compressor to the gas suction port of the compressor through the
flow path switching valve, the first heat exchanger, the throttling
element, the defrosting branch, the heating heat exchanger and the
flow path switching valve; and at this moment, high-temperature
gaseous refrigerant flows to the first heat exchanger to perform
defrosting on the first heat exchanger.
30. The multifunctional mode control method for the heat pump unit
according to claim 29, wherein the defrosting branch comprises a
third electromagnetic valve and a fifth one-way valve, wherein the
fifth one-way valve is conducted along a flow direction from the
throttling element to the heating heat exchanger; and when the
defrosting mode is enabled, the third electromagnetic valve is
conducted, the first electromagnetic valve and the second
electromagnetic valve are disconnected, and the flow path switching
valve is switched to the second switching position.
31. The multifunctional mode control method for the heat pump unit
according to claim 29, further comprising a gas suction pressure
sensor which is arranged at the gas suction port of the compressor;
wherein when the gas suction pressure is smaller than a first
pressure threshold, the first heat exchange is frosted and at this
moment the defrosting mode is enabled.
32. The multifunctional mode control method for the heat pump unit
according to claim 29, further comprising a first temperature
sensor which is arranged at the position of the first heat
exchanger; wherein when a difference between the first temperature
and ambient temperature is small than a first temperature
threshold, the first heat exchanger is frosted and at this moment
the defrosting mode is enabled.
33. The multifunctional mode control method for the heat pump unit
according to claim 25, further comprising a fourth electromagnetic
valve which is arranged between the flow path switching valve and a
second end of the refrigeration heat exchanger; and a hot gas
bypass branch, wherein the hot gas bypass branch comprises a first
branch section which connects the gas outlet of the compressor and
the second end of the refrigeration heat exchanger, and a second
branch section which connects a first end of the refrigeration heat
exchanger and an inlet of the throttling element; when a hot gas
bypass mode is enabled, the hot gas bypass branch is conducted, and
the circular flow direction of the refrigerant is from the gas
outlet of the compressor to the gas suction port of the compressor
through the first branch section, the refrigeration heat exchanger,
the second branch section, the throttling element, the first heat
exchanger and the flow path switching valve; and at this moment,
high-temperature gaseous refrigerant flows to the refrigeration
heat exchanger and squeezes out liquid refrigerant in the
refrigeration heat exchanger.
34. The multifunctional mode control method for the heat pump unit
according to claim 33, further comprising a fifth electromagnetic
valve which is arranged on the first branch section and/or a sixth
one-way valve which is arranged on the second branch section;
wherein when the hot gas bypass mode is enabled, the fifth
electromagnetic valve and the second electromagnetic valve are
conducted, the first electromagnetic valve and the fourth
electromagnetic valve are disconnected, and the flow path switching
valve is switched to the second switching position.
35. The multifunctional mode control method for the heat pump unit
according to claim 33, further comprising a first pressure sensor
which is arranged in the refrigeration heat exchanger; wherein when
an internal pressure of the refrigeration heat exchanger is smaller
than a second pressure threshold, liquid refrigerant starts to be
accumulated in the refrigeration heat exchanger and at this moment
the hot gas bypass mode is enabled.
36. The multifunctional mode control method for the heat pump unit
according to claim 33, further comprising a liquid level sensor
which is arranged in the refrigeration heat exchanger; wherein when
a liquid level in the refrigeration heat exchanger is greater than
a first liquid level threshold, liquid refrigerant starts to be
accumulated in the refrigeration heat exchanger and at this moment
the hot gas bypass mode is enabled.
Description
TECHNICAL FIELD
[0001] The present invention relates to a heat pump unit and a
multifunctional mode control method thereof, in particular to a
heat pump unit with multifunctional modes such as refrigeration,
heat supply, sanitary hot water supply and simultaneous
refrigeration and heat supply/sanitary hot water supply and the
like, and a multifunctional mode control method thereof.
BACKGROUND ART
[0002] Heat pump units designed by adopting a four-pipe system are
usually applied to places such as hospitals and hotels, where two
pipelines are applied to supply heat or provide sanitary hot water,
and the other two pipelines may be applied to refrigeration. This
type of heat pump units can provide heating and refrigeration
functions for different user ends throughout the year, so as to
provide relatively better user experience. At the same time, this
type of heat pump units may also require more complex water system
control solutions and occupy huge equipment arrangement spaces. In
addition to relatively high expenses and costs of parts, pipeline
arrangement complexity and labor costs also increase; and the more
complex the system is, the more professional and difficult the
inspection and maintenance are, and great inconvenience is caused
to users.
SUMMARY OF THE INVENTION
[0003] The purpose of the present invention is to provide a heat
pump unit with multifunctional modes such as refrigeration, heat
supply, sanitary hot water supply and simultaneous refrigeration
and heat supply/sanitary hot water supply, and the like.
[0004] The purpose of the present invention is to further provide a
multifunctional mode control method for the above-described heat
pump unit.
[0005] According to one aspect of the present invention, there is
provided a heat pump unit, which comprises: a heat pump system
comprising a compressor, a refrigeration heat exchanger, a heating
heat exchanger, a first heat exchanger, a flow path switching valve
which is capable of switching a flow direction of refrigerant and a
throttling element, wherein the throttling element is arranged on a
flow path between any two of the refrigeration heat exchanger, the
heating heat exchanger and the first heat exchanger; and further
comprising: a mode switching flow path, wherein a first flow path,
a second flow path and a third flow path are arranged in the mode
switching flow path and each flow path is controllably conducted or
disconnected to realize different functional modes, wherein, under
a sole refrigeration mode, a circular flow direction of the
refrigerant is from a gas outlet of the compressor to a gas suction
port of the compressor through the flow path switching valve, the
first heat exchanger, the first flow path of the mode switching
flow path and the refrigeration heat exchanger; and/or under a sole
heating mode, the circular flow direction of the refrigerant is
from the gas outlet of the compressor to the gas suction port of
the compressor through the flow path switching valve, the heating
heat exchanger, the second flow path of the mode switching flow
path, the first heat exchanger and the flow path switching valve;
and/or under a simultaneous refrigeration and heating mode, the
circular flow direction of the refrigerant is from the gas outlet
of the compressor to the gas suction port of the compressor through
the flow path switching valve, the heating heat exchanger, the
third flow path of the mode switching flow path and the
refrigeration heat exchanger; a refrigeration water system which
exchanges heat with the refrigeration heat exchanger; and a heating
water system which exchanges heat with the heating heat
exchanger.
[0006] According to another aspect of the present invention, there
is further provided a multifunctional mode control method for a
heat pump unit, wherein the heat pump unit comprises a compressor,
a refrigeration heat exchanger, a heating heat exchanger, a first
heat exchanger, a flow path switching valve which is capable of
switching a flow direction of refrigerant and a throttling element,
wherein the throttling element is arranged on a flow path between
any two of the refrigeration heat exchanger, the heating heat
exchanger and the first heat exchanger; and a refrigeration water
system and a heating water system; and further comprises a mode
switching flow path, wherein a first flow path, a second flow path
and a third flow path are arranged in the mode switching flow path,
wherein, during operation in a sole refrigeration mode, the first
flow path of the mode switching flow path is conducted, and the
second flow path and the third flow path of the mode switching flow
path are disconnected; a circular flow direction of the refrigerant
is from a gas outlet of the compressor to a gas suction port of the
compressor through the flow path switching valve, the first heat
exchanger, the first flow path of the mode switching flow path and
the refrigeration heat exchanger; and at this moment, the
refrigeration water system exchanges heat with the refrigeration
heat exchanger; and/or during operation in a sole heating mode, the
second flow path of the mode switching flow path is conducted, and
the first flow path and the third flow path of the mode switching
flow path are disconnected; the circular flow direction of the
refrigerant is from the gas outlet of the compressor to the gas
suction port of the compressor through the flow path switching
valve, the heating heat exchanger, the second flow path of the mode
switching flow path, the first heat exchanger and the flow path
switching valve; and at this moment, the heating water system
exchanges heat with the heating heat exchanger; and/or during
operation in a simultaneous refrigeration and heating mode, the
third flow path of the mode switching flow path is conducted, and
the first flow path and the second flow path of the mode switching
flow path are disconnected; the circular flow direction of the
refrigerant is from the gas outlet of the compressor to the gas
suction port of the compressor through the flow path switching
valve, the heating heat exchanger, the third flow path of the mode
switching flow path and the refrigeration heat exchanger; and at
this moment, the refrigeration water system and the heating water
system respectively exchange heat with the refrigeration heat
exchanger and the heating heat exchanger.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 illustrates a schematic view of a heat pump unit
according to one embodiment of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0008] As illustrated in FIG. 1, according to one embodiment of the
present invention, a heat pump unit is illustrated and comprises a
heat pump system 100, a refrigeration water system 200 and a
heating water system 300. Here, the heat pump system 100 is a
system for refrigerant working and circulation, and refrigerant is
compressed by a compressor and then releases or absorbs heat at
positions of different heat exchangers. The refrigeration water
system 200 and the heating water system 300 are systems for water
working and circulation, water in the refrigeration water system
200 and the heating water system 300 exchanges heat with each heat
exchanger in the heat pump system 100 to release or absorb heat to
produce cold water or hot water, so as to provide further
refrigeration, heat supply or sanitary hot water supply
functions.
[0009] Specifically, the heat pump system 100 comprises a
compressor 110, a refrigeration heat exchanger 130, a heating heat
exchanger 140, a first heat exchanger 150, a flow path switching
valve 120 and a throttling element 160, wherein the throttling
element 160 is arranged such that the throttling element 160 exists
on a flow path between any two of the refrigeration heat exchanger
130, the heating heat exchanger 140 and the first heat exchanger
150. In order to realize this purpose, several throttling elements
160 may be arranged such that the throttling elements 160 are
respectively arranged in a flow path between every two heat
exchangers; and only one throttling element 160 may also be
arranged, and the throttling element 160 is guaranteed to be
located on the flow path between any two of the heat exchangers
through flow path design. Or, a combination of above-mentioned
arrangements is used.
[0010] Besides, the heat pump system should further comprise a mode
switching flow path, wherein a first flow path, a second flow path
and a third flow path are respectively arranged in the mode
switching flow path, and all flow paths may be fully independent or
have a partially overlapped common flow path. In addition, each
flow path is controllably conducted or disconnected to realize
different functional modes. As an example, under a sole
refrigeration mode, a circular flow direction of the refrigerant is
from a gas outlet of the compressor 110 to a gas suction port of
the compressor 110 through the flow path switching valve 120, the
first heat exchanger 150, the first flow path of the mode switching
flow path and the refrigeration heat exchanger 130; and/or under a
sole heating mode, the circular flow direction of the refrigerant
is from the gas outlet of the compressor 110 to the gas suction
port of the compressor 110 through the flow path switching valve
120, the heating heat exchanger 140, the second flow path of the
mode switching flow path, the first heat exchanger 150 and the flow
path switching valve 120; and/or under a simultaneous refrigeration
and heating mode, the circular flow direction of the refrigerant is
from the gas outlet of the compressor 110 to the gas suction port
of the compressor 110 through the flow path switching valve 120,
the heating heat exchanger 140, the third flow path of the mode
switching flow path and the refrigeration heat exchanger 130.
[0011] Besides, the refrigeration water system 200 realizes heat
exchange with the heat pump system 100 through the refrigeration
heat exchanger 130 and supplies cold to a user end; and the heating
water system 300 realizes heat exchange with the heat pump system
100 through the heating heat exchanger 140 and supplies heat to the
user end.
[0012] Based on the above-mentioned heat pump unit, multiple modes
such as refrigeration, heating and simultaneous refrigeration and
heating and the like may be respectively realized. In consideration
of the fact that heating may include two sub-modes: heat supply and
sanitary hot water supply, the above-mentioned heat pump system may
respectively fulfill five functional modes with only one set of
system and only one flow path switching valve. Thus, the costs of
parts are greatly reduced and the complexity of water loop control
is simplified. As compared with the existing four-pipe unit using
two sets of systems, the operation costs may be decreased by up to
20%.
[0013] Under the concept of the above-mentioned mode switching flow
path, according to the understanding of one skilled in the art,
multiple specific flow paths and element connection ways may be
obtained. One of implementation modes is described in detail herein
with reference to FIG. 1. For example, from upstream to downstream,
the first flow path may comprise a conducted first one-way valve
181, a throttling element 160, a first electromagnetic valve 171
and a conducted second one-way valve 182 which are sequentially
connected; and/or from upstream to downstream, the second flow path
may comprise a conducted third one-way valve 183, a throttling
element 160, a second electromagnetic valve 172 and a conducted
fourth one-way valve 184 which are sequentially connected; and/or
from upstream to downstream, the third flow path may comprise a
conducted third one-way valve 183, a throttling element 160, a
first electromagnetic valve 171 and a conducted second one-way
valve 182 which are sequentially connected. In this implementation
mode, under a sole refrigeration mode, the circular flow direction
of the refrigerant is from a gas outlet of the compressor 110 to a
gas suction port of the compressor 110 through the flow path
switching valve 120, the first heat exchanger 150, the first
one-way valve 181, the throttling element 160, the first
electromagnetic valve 171, the second one-way valve 182 and the
refrigeration heat exchanger 130; and/or under a sole heating mode,
the circular flow direction of the refrigerant is from the gas
outlet of the compressor 110 to the gas suction port of the
compressor 110 through the flow path switching valve 120, the
heating heat exchanger 140, the third one-way valve 183, the
throttling element 160, the second electromagnetic valve 172, the
fourth one-way valve 184, the first heat exchanger 150 and the flow
path switching valve 120; and/or under a simultaneous refrigeration
and heating mode, the circular flow direction of the refrigerant is
from the gas outlet of the compressor 110 to the gas suction port
of the compressor 110 through the flow path switching valve 120,
the heating heat exchanger 140, the third one-way valve 183, the
throttling element 160, the first electromagnetic valve 171, the
second one-way valve 182 and the refrigeration heat exchanger
130.
[0014] Alternatively, in order to further complete the functions of
the heat pump unit, a defrosting branch may be further arranged and
is connected with a flow path between an outlet of the throttling
element 160 and an outlet of the heating heat exchanger 140; and
the defrosting branch is controllably opened or closed to enable or
disable a defrosting function. For example, in the embodiment
illustrated in FIG. 1, a third electromagnetic valve 173 and a
fifth one-way valve 185 are arranged on the defrosting branch,
wherein the fifth one-way valve 185 is arranged downstream of the
third electromagnetic valve 173 and the fifth one-way 185 is
conducted along a flow direction from the throttling element 160 to
the heating heat exchanger 140. During operation in a defrosting
mode, the defrosting branch is conducted by conducting the third
electromagnetic valve 173 to perform defrosting on the first heat
exchanger 150.
[0015] Specifically, in order to provide a condition for judging
whether to operate the defrosting mode, a gas suction pressure
sensor should be further arranged at the gas suction port of the
compressor 110 and/or a first temperature sensor should be further
arranged at the position of the first heat exchanger 150. Whether
to enter the defrosting mode is judged by detecting a gas suction
pressure and/or a temperature at the position of the first heat
exchanger. For example, when the gas suction pressure is relatively
low, it indicates that a frosting situation possibly exists in the
first heat exchanger and the defrosting mode needs to be enabled.
For another example, when a difference between the temperature at
the position of the first heat exchanger and ambient temperature is
relatively small, it also indicates that a frosting situation
possibly exists in the first heat exchanger and the defrosting mode
needs to be enabled.
[0016] Alternatively, as another implementation mode for completing
the functions of the heat pump unit, a hot gas bypass branch may be
further arranged and a fourth electromagnetic valve 174 may be
arranged between the flow path switching valve 120 and a second end
of the refrigeration heat exchanger 130; the hot gas bypass branch
comprises a first branch section which connects the gas outlet of
the compressor 110 and the second end of the refrigeration heat
exchanger 130, and a second branch section which connects a first
end of the refrigeration heat exchanger 130 and an inlet of the
throttling element 160; and the hot gas bypass branch together with
the fourth electromagnetic valve 174 is controllably conducted or
disconnected to enable or disable a hot gas bypass function. For
example, in the embodiment illustrated in FIG. 1, a fifth
electromagnetic valve 175 is arranged on the first branch section
and/or a sixth one-way valve 186 is arranged on the second branch
section. During operation in a hot gas bypass mode, the hot gas
bypass branch is conducted by conducting the fifth electromagnetic
valve 175, and the fourth electromagnetic valve 174 and the first
electromagnetic valve 171 are disconnected to block the two ends of
the refrigeration heat exchanger 130, such that high-temperature
gaseous refrigerant directly flows into the refrigeration heat
exchanger 130 through the compressor 110 to drain liquid
refrigerant accumulated in the refrigeration heat exchanger 130 out
through the second branch section, thereby not only preventing the
liquid refrigerant from being accumulated in the refrigeration heat
exchanger 130 and being frozen, but also guaranteeing enough
refrigerant to participate in working and circulation.
[0017] Specifically, in order to provide a condition for judging
whether to operate the hot gas bypass mode, a first pressure sensor
should be further arranged in the refrigeration heat exchanger 130
and/or a liquid level sensor should be further arranged in the
refrigeration heat exchanger 130. Whether to enter the hot gas
bypass mode is judged by detecting an internal pressure of the
refrigeration heat exchanger 130 and/or a liquid level in the
refrigeration heat exchanger 130. For example, when the internal
pressure of the refrigeration heat exchanger 130 is relatively low,
it indicates that liquid refrigerant possibly starts to be
accumulated in the refrigeration heat exchanger and the hot gas
bypass mode needs to be enabled. For another example, when a
certain liquid level exists in the refrigeration heat exchanger
130, it also indicates that liquid refrigerant possibly starts to
be accumulated in the refrigeration heat exchanger 130 and the hot
gas bypass mode needs to be enabled.
[0018] In addition, in order to further improve the heat pump unit
provided by this embodiment, the flow path thereof may also be
improved and the type of the parts thereof may be reasonably
selected. Partial specific implementation modes will be described
below with reference to FIG. 1.
[0019] Alternatively, the first flow path and/or the second flow
path and/or the third flow path have a common flow path, and the
throttling element 160 is arranged on the common flow path. This
design allows that the same throttling element may be shared under
various modes, the throttling effect is kept and the costs of parts
are reduced at the same time. Here, as an alternative embodiment,
the throttling element 160 may be an electronic expansion valve or
other throttling expansion mechanisms. As a preferred solution, the
electronic expansion valve can be controllably adjusted, such that
throttling to different extents is provided under different
functional modes or under different refrigerant flow rates to
better adapt to the actual working conditions.
[0020] Alternatively, the system further comprises a drier-filter
192, and the drier-filter 192 is arranged on the common flow path
and is located upstream of the throttling element 160, so as to
provide drying and filtering effects for refrigerant which enters
the throttling element 160 and prevent the throttling element 160
from being blocked.
[0021] Alternatively, the system further comprises a liquid
reservoir 191 and the liquid reservoir 191 is arranged between a
location downstream of the heating heat exchanger 140 and the third
one-way valve 183. When different refrigerant amounts are needed
during operation in different functional modes, excessive
refrigerant may be stored in the liquid reservoir 191.
[0022] Alternatively, the system further comprises a gas-liquid
separator 193 which is arranged upstream of the gas suction port of
the compressor 110, so as to separate liquid refrigerant from a
refrigerant flow which flows into the compressor 110, thereby
avoiding the problems such as compressor liquid impact and the
like.
[0023] Besides, for the type selection and design of the parts
thereof, the specific implementation modes are also provided below
with reference to FIG. 1 for the purpose of reference.
[0024] For example, the flow path switching valve 120 may be a
four-way valve and may also be other valves which are capable of
switching the flow direction of the refrigerant. Further, the flow
path switching valve 120 should have a first switching position and
a second switching position, so as to implement switching between
at least two flow directions. Here, at the first switching
position, the gas outlet of the compressor 110 is connected to the
heating heat exchanger 140 through the flow path switching valve
120; and/or at the second switching position, the gas outlet of the
compressor 110 is connected to the first heat exchanger 150 through
the flow path switching valve 120.
[0025] Besides, jointly arranging the electromagnetic valve and the
one-way valve in a certain flow path is mentioned multiple times
above, mainly because a conventional electromagnetic valve is
generally difficult to have an effect of reverse and full closing.
As a result, in order to guarantee that a flow path can be fully
disconnected when an electromagnetic valve is closed, a one-way
valve with a reverse cutoff function should be further
correspondingly provided. Accordingly, it is also feasible to adopt
other types of valves which can fully control the conduction and
disconnection of the flow path. In other words, a first valve, a
second valve and a third valve which can realize two-way full
closing may be used for respectively replacing the combination of
the above-mentioned electromagnetic valve and the one-way valve.
For example, as an alternative implementation mode, electric ball
valves may be used for replacing the combination of the
electromagnetic valve and the one-way valve.
[0026] More specifically, in the embodiment described above, a
design may be adopted such that the first flow path comprises a
first one-way valve 181, a throttling element 160 and a first
electric ball valve which are sequentially connected; and/or the
second flow path comprises a third one-way valve 183, a throttling
element 160 and a second electric ball valve which are sequentially
connected; and/or the third flow path comprises a third one-way
valve 183, a throttling element 160 and a first electric ball valve
which are sequentially connected. For another example, in the
embodiment described above, a design may be adopted such that a
third electric ball valve is arranged on the defrosting branch.
[0027] Alternatively, the first heat exchanger 150 may be a
water-refrigerant heat exchanger or an air-refrigerant heat
exchanger. When the first heat exchanger 150 is an air-refrigerant
heat exchanger, the first heat exchanger 150 may comprise a
V-shaped heat exchange coil, so as to achieve better heat exchange
efficiency. Only when the first heat exchanger 150 is an
air-refrigerant heat exchanger, there is a need for defrosting.
[0028] Alternatively, the compressor 110 may be a scroll compressor
110 or a screw compressor 110.
[0029] The water system of the heat pump unit will be further
described below with reference to FIG. 1.
[0030] The water system in this embodiment comprises a
refrigeration water system 200 and a heating water system 300. The
refrigeration water system 200 comprises a first water loop which
is connected between a refrigeration end 240 and the refrigeration
heat exchanger 130. The first water loop comprises a first water
inlet pipeline 210, a first water return pipeline 220 and a first
water pump 230 which drives water to circulate therein.
[0031] In addition, the heating water system 300 comprises a second
water loop which is connected between a heating end 340 and the
heating heat exchanger 140; and the second water loop comprises a
second water inlet pipeline 310, a second water return pipeline 320
and a second water pump 330 which drives water to circulate in the
water loop. In this embodiment, in consideration of demands of
hotels, hospitals or other application places, the heating end 340
is required to be capable of providing heating or sanitary hot
water. Thus, the heating end 340 should comprise a heat supply end
and/or a sanitary hot water end.
[0032] One embodiment of the heat pump unit is described in detail
above with reference to FIG. 1. A multifunctional mode control
method suitable for the heat pump unit will be further described
below in combination with the heat pump unit.
[0033] With respect to the most fundamental heat pump unit, in
other words, the heat pump unit comprises a compressor 110, a
refrigeration heat exchanger 130, a heating heat exchanger 140, a
first heat exchanger 150, a flow path switching valve 120 which is
capable of switching a flow direction of refrigerant and a
throttling element 160, wherein the throttling element 160 is
arranged on a flow path between any two of the refrigeration heat
exchanger 130, the heating heat exchanger 140 and the first heat
exchanger 150; and a refrigeration water system and a heating water
system; and further comprises a mode switching flow path, wherein a
first flow path, a second flow path and a third flow path are
arranged in the mode switching flow path. In such a case, during
operation in a sole refrigeration mode, the first flow path of the
mode switching flow path is conducted, and the second flow path and
the third flow path of the mode switching flow path are
disconnected; a circular flow direction of the refrigerant is from
a gas outlet of the compressor 110 to a gas suction port of the
compressor 110 through the flow path switching valve 120, the first
heat exchanger 150, the first flow path of the mode switching flow
path and the refrigeration heat exchanger 130; and at this moment,
the refrigeration water system exchanges heat with the
refrigeration heat exchanger 130; and/or during operation in a sole
heating mode, the second flow path of the mode switching flow path
is conducted, and the first flow path and the third flow path of
the mode switching flow path are disconnected; the circular flow
direction of the refrigerant is from the gas outlet of the
compressor 110 to the gas suction port of the compressor 110
through the flow path switching valve 120, the heating heat
exchanger 140, the second flow path of the mode switching flow
path, the first heat exchanger 150 and the flow path switching
valve 120; and at this moment, the heating water system exchanges
heat with the heating heat exchanger 140; and/or during operation
in a simultaneous refrigeration and heating mode, the third flow
path of the mode switching flow path is conducted, and the first
flow path and the second flow path of the mode switching flow path
are disconnected; the circular flow direction of the refrigerant is
from the gas outlet of the compressor 110 to the gas suction port
of the compressor 110 through the flow path switching valve 120,
the heating heat exchanger 140, the third flow path of the mode
switching flow path and the refrigeration heat exchanger 130; and
at this moment, the refrigeration water system and the heating
water system respectively exchange heat with the refrigeration heat
exchanger 130 and the heating heat exchanger 140.
[0034] More specifically, when the heating water system further
comprises a heat supply end and/or a sanitary hot water end, a sole
heating mode is further divided into a heat supply mode and/or a
sanitary hot water mode. During operation in the heat supply mode,
the heat supply end exchanges heat with the heating heat exchanger
140; and/or during operation in the sanitary hot water mode, the
sanitary hot water end exchanges heat with the heating heat
exchanger 140. As an alternative implementation mode, when the
heating water system further comprises a heat supply end and/or a
sanitary hot water end, the simultaneous refrigeration and heating
mode further comprises a simultaneous refrigeration and heat supply
mode and/or a simultaneous refrigeration and sanitary hot water
mode. During operation in the simultaneous refrigeration and heat
supply mode, the heat supply end exchanges heat with the heating
heat exchanger 140; and/or during operation in the simultaneous
refrigeration and sanitary hot water mode, the sanitary hot water
end exchanges heat with the heating heat exchanger 140. Under this
situation, heating or sanitary hot water can be respectively or
simultaneously provided for a user end.
[0035] Specifically, under a situation that a first electromagnetic
valve 171 and a second electromagnetic valve 172 are arranged in
the mode switching flow path, a control method for conducting each
flow path is provided in detail herein. When the first
electromagnetic valve 171 is conducted, the second electromagnetic
valve 172 is disconnected and the flow path switching valve 120 is
switched to a second switching position, the first flow path of the
mode switching flow path is conducted and the second flow path and
the third flow path of the mode switching flow path are
disconnected; and/or when the second electromagnetic valve 172 is
conducted, the first electromagnetic valve 171 is disconnected and
the flow path switching valve 120 is switched to a first switching
position, the second flow path of the mode switching flow path is
conducted and the first flow path and the third flow path of the
mode switching flow path are disconnected; and/or when the first
electromagnetic valve 171 is conducted, the second electromagnetic
valve 172 is disconnected and the flow path switching valve 120 is
switched to a first switching position, the third flow path of the
mode switching flow path is conducted and the first flow path and
the second flow path of the mode switching flow path are
disconnected.
[0036] Alternatively, in order to improve the defrosting function
of the heat pump unit, the heat pump unit further comprises a
defrosting branch which is connected between an outlet of the
throttling element 160 and an outlet of the heating heat exchanger
140. In this implementation mode, when a defrosting mode is
enabled, the defrosting branch is conducted, the circular flow
direction of the refrigerant is from the gas outlet of the
compressor 110 to the gas suction port of the compressor 110
through the flow path switching valve 120, the first heat exchanger
150, the throttling element 160, the defrosting branch, the heating
heat exchanger 140 and the flow path switching valve 120; and at
this moment, high-temperature gaseous refrigerant flows to the
first heat exchanger 150 to perform defrosting on the first heat
exchanger 150.
[0037] Specifically, a control method for operating the defrosting
mode is provided in detail herein. That is, when the defrosting
mode is enabled, the third electromagnetic valve 173 is conducted,
the first electromagnetic valve 171 and the second electromagnetic
valve 172 are disconnected, and the flow path switching valve 120
is switched to the second switching position.
[0038] In order to clearly know whether or when to operate the
defrosting mode, a plurality of conditions for judging whether to
conduct the defrosting branch is provided in this embodiment. As an
implementation mode, the heat pump unit comprises a gas suction
pressure sensor which is arranged at the gas suction port of the
compressor 110; and when the gas suction pressure is smaller than a
first pressure threshold, a frosting phenomenon may probably occur
in the first heat exchange 150 and at this moment the defrosting
mode needs to be enabled. As another implementation mode, the heat
pump unit comprises a first temperature sensor which is arranged at
the position of the first heat exchanger 150; and when a difference
between the first temperature and ambient temperature is small than
a first temperature threshold, a frosting phenomenon may probably
occur in the first heat exchanger 150 and the defrosting mode needs
to be enabled.
[0039] Alternatively, in order to prevent the refrigeration heat
exchanger 130 from having a risk of being frozen during operation
in the heating mode and prevent the refrigerant from having a risk
of imbalance in a mode switching process, the heat pump unit
further comprises a fourth electromagnetic valve 174 which is
arranged between the flow path switching valve 120 and a second end
of the refrigeration heat exchanger 130, and a hot gas bypass
branch; the hot gas bypass branch comprises a first branch section
which connects the gas outlet of the compressor 110 and the second
end of the refrigeration heat exchanger 130, and a second branch
section which connects a first end of the refrigeration heat
exchanger 130 and an inlet of the throttling element 160. In this
implementation mode, when a hot gas bypass mode is enabled, the hot
gas bypass branch is conducted, and the circular flow direction of
the refrigerant is from the gas outlet of the compressor 110 to the
gas suction port of the compressor 110 through the first branch
section, the refrigeration heat exchanger 130, the second branch
section, the throttling element 160, the first heat exchanger 150
and the flow path switching valve 120; and at this moment,
high-temperature gaseous refrigerant flows to the refrigeration
heat exchanger 130 and squeezes out liquid refrigerant in the
refrigeration heat exchanger 130.
[0040] Specifically, when the heat pump unit comprises a fifth
electromagnetic valve 175 which is arranged on the first branch
section and/or a sixth one-way valve 186 which is arranged on the
second branch section, a control method for enabling the hot gas
bypass mode is provided in detail herein. That is, when the hot gas
bypass mode is enabled, the fifth electromagnetic valve 175 and the
second electromagnetic valve 172 are conducted, the first
electromagnetic valve 171 and the fourth electromagnetic valve 174
are disconnected, and the flow path switching valve is switched to
the second switching position.
[0041] In order to clearly know whether or when to operate the hot
gas bypass mode, a plurality of conditions for judging whether to
conduct the hot gas bypass branch is provided in this embodiment.
As an implementation mode, the heat pump unit comprises a first
pressure sensor which is arranged in the refrigeration heat
exchanger 130; and when an internal pressure of the refrigeration
heat exchanger 130 is smaller than a second pressure threshold,
liquid refrigerant probably starts to be accumulated in the
refrigeration heat exchanger 130 and at this moment the hot gas
bypass mode is enabled. Specifically, in this implementation mode,
if a saturated temperature of refrigerant in the refrigeration heat
exchanger 130 is lower than a freezing point temperature of water
(or other secondary refrigerant which exchanges heat with the
refrigerant), at this moment the refrigeration heat exchanger has a
risk of being frozen and thus a hot gas bypass is needed. As
another implementation mode, the heat pump unit comprises a liquid
level sensor which is arranged in the refrigeration heat exchanger
130; and when a liquid level in the refrigeration heat exchanger
130 is greater than a first liquid level threshold, liquid
refrigerant probably starts to be accumulated in the refrigeration
heat exchanger 130 and at this moment the hot gas bypass mode is
enabled.
[0042] After the embodiments of the heat pump unit and the control
method thereof provided by the present invention are described in
detail above, a working process of the heat pump unit provided by
the present invention will be comprehensively and integrally
described below with reference to FIG. 1.
[0043] During operation in a sole refrigeration mode, the flow path
switching valve 120 is switched to the second position and the
first electromagnetic valve 171 and the fourth electromagnetic
valve 174 are conducted; the second electromagnetic valve 172, the
third electromagnetic valve 173 and the fifth electromagnetic valve
175 are disconnected; and at this moment, the circular flow
direction of the refrigerant is from the gas outlet of the
compressor 110 to the gas suction port of the compressor 110
through the flow path switching valve 120, the first heat exchanger
150, the first one-way valve 181, the drier-filter 192, the
throttling element 160, the first electromagnetic valve 171, the
second one-way valve 182, the refrigeration heat exchanger 130, the
fourth electromagnetic valve 174 and the gas-liquid separator 193.
Here, the refrigerant releases heat at the position of the first
heat exchanger 150 and absorbs heat at the position of the
refrigeration heat exchanger 130. Water flowing through the
refrigeration heat exchanger 130 via the refrigeration water system
200 is cooled thereby and flows to the refrigeration end 240 under
the drive of the first water pump 230 to provide cold for a
user.
[0044] During operation in a sole heating mode, the four-way valve
120 is switched to the first position and the second
electromagnetic valve 172 is conducted; the first electromagnetic
valve 171, the third electromagnetic valve 173, the fourth
electromagnetic valve 174 and the fifth electromagnetic valve 175
are disconnected; and the circular flow direction of the
refrigerant is from the gas outlet of the compressor 110 to the gas
suction port of the compressor 110 through the flow path switching
valve 120, the heating heat exchanger 140, the liquid reservoir
191, the third one-way valve 183, the drier-filter 192, the
throttling element 160, the second electromagnetic valve 172, the
fourth one-way valve 184, the first heat exchanger 150, the flow
path switching valve 120 and the gas-liquid separator 193. Here,
the refrigerant releases heat at the position of the heating heat
exchanger 140 and absorbs heat at the position of the first heat
exchanger 150. Water flowing through the heating heat exchanger 140
via the heating water system 300 is heated thereby and flows to the
heating end 340 under the drive of the second water pump 330 for
heating. Specifically, the heating end 340 may be a heat supply end
and/or a sanitary hot water end. When the heating end 340 is a heat
supply end, heating may be provided to the user; and when the
heating end 340 is a sanitary hot water end, sanitary hot water may
be provided to the user. Of course, the heating end 340 may be
simultaneously the both, and at this moment water pipelines for
heat supply and sanitary hot water supply should be isolated since
heat supply hot water is only used as a heat transfer medium and
the requirement on water quality is not high while sanitary hot
water is directly used by the user and the water quality thereof
needs to satisfy corresponding standards.
[0045] During operation in a simultaneous refrigeration and heating
mode, the four-way valve 120 is switched to the first position and
the first electromagnetic valve 171 and the fourth electromagnetic
valve 174 are conducted; the second electromagnetic valve 172, the
third electromagnetic valve 173 and the fifth electromagnetic valve
175 are disconnected; the circular flow direction of the
refrigerant is from the gas outlet of the compressor 110 to the gas
suction port of the compressor 110 through the flow path switching
valve 120, the heating heat exchanger 140, the liquid reservoir
191, the third one-way valve 183, the drier-filter 192, the
throttling element 160, the first electromagnetic valve 171, the
second one-way valve 182, the refrigeration heat exchanger 130, the
fourth electromagnetic valve 174 and the gas-liquid separator 193.
Here, the refrigerant releases heat at the position of the heating
heat exchanger 140 and absorbs heat at the position of the
refrigeration heat exchanger 130. At this moment, on one hand,
water flowing through the refrigeration heat exchanger 130 via the
refrigeration water system 200 is cooled thereby and flows to the
refrigeration end 240 under the drive of the first water pump 230
to provide cold for the user; and on the other hand, water flowing
through the heating heat exchanger 140 via the heating water system
300 is heated thereby and flows to the heating end 340 under the
drive of the second water pump 330 for heating. Specifically, the
heating end 340 may be a heat supply end and/or a sanitary hot
water end. When the heating end 340 is a heat supply end, heating
may be provided to the user; and when the heating end 340 is a
sanitary hot water end, sanitary hot water may be provided to the
user. Of course, the heating end 340 may be simultaneously the
both, and at this moment water pipelines for heat supply and
sanitary hot water supply should be isolated since heat supply hot
water is only used as a heat transfer medium and the requirement on
water quality is not high while sanitary hot water is directly used
by the user and the water quality thereof needs to satisfy
corresponding standards.
[0046] During operation in a defrosting mode, the four-way valve
120 is switched to the second position and the third
electromagnetic valve 173 is conducted; the first electromagnetic
valve 171, the second electromagnetic valve 172, the fourth
electromagnetic valve 174 and the fifth electromagnetic valve 175
are disconnected; and the circular flow direction of the
refrigerant is from the gas outlet of the compressor 110 to the gas
suction port of the compressor 110 through the flow path switching
valve 120, the first heat exchanger 150, the first one-way valve
181, the drier-filter 192, the throttling element 160, the third
electromagnetic valve 173, the fifth one-way valve 185, the liquid
reservoir 191, the heating heat exchanger 140, the flow path
switching valve 120 and the gas-liquid separator 193. Here, the
refrigerant releases heat at the position of the first heat
exchanger 150 and absorbs heat at the position of the heating heat
exchanger 140. At this moment, the first heat exchanger 150 which
is at low temperature for a long time and is possibly frosted will
achieve a defrosting effect under the circulation of
high-temperature gaseous refrigerant, and thereby the performance
of the heat exchanger and the system is prevented from being
influenced.
[0047] When a hot gas bypass function is enabled, the second
electromagnetic valve 172 and the fifth electromagnetic valve 175
are conducted; the first electromagnetic valve 171, the third
electromagnetic valve 173 and the fourth electromagnetic valve 174
are disconnected; and the circular flow direction of the
refrigerant is from the gas outlet of the compressor 110 to the gas
suction port of the compressor 110 through the fifth
electromagnetic valve 175, the refrigeration heat exchanger 130,
the sixth one-way valve 186, the drier-filter 192, the throttling
element 160, the second electromagnetic valve 172, the fourth
one-way valve 184, the first heat exchanger 150, the flow path
switching valve 120 and the gas-liquid separator 193. At this
moment, the refrigeration heat exchanger 130 which possibly is at
low temperature and accumulates a number of liquid refrigerant in
winter will drain the liquid refrigerant to the heat pump system
under the circulation of high-temperature gaseous refrigerant to
participate in normal working and circulation, and thereby is
prevented from being frozen.
[0048] In the description of the present invention, it needs to be
understood that direction or position relationships indicated by
terms "above", "below", "front", "rear", "left", "right" and the
like are direction or position relationships illustrated in the
drawings, and are only used for facilitating the description of the
present invention and simplifying the description instead of
indicating or implying that the indicated devices or features must
have specific directions and be constructed and operated in
specific directions, and thus shall not be understood as
limitations to the present invention.
[0049] The above-mentioned examples mainly describe the heat pump
unit and the control method thereof provided by the present
invention. Although only some implementation modes of the present
invention are described, one skilled in the art shall understand
that the present invention may be implemented in many other forms
without departing from the essence and scope of the present
invention. Therefore, the described examples and implementation
modes shall be considered as exemplary instead of restrictive. The
present invention may cover various modifications and replacements
without going beyond the spirit and scope of the present invention
as defined by the attached claims.
* * * * *