U.S. patent application number 17/627043 was filed with the patent office on 2022-09-01 for refrigeration system and refrigerated storage.
The applicant listed for this patent is Gree Electric Appliances, Inc. of Zhuhai. Invention is credited to Haomin Lian, Zhongkeng Long, Chiliang Luo, Ningfang Ma, Zhiping Zhang, Wei Zhou.
Application Number | 20220275976 17/627043 |
Document ID | / |
Family ID | 1000006391780 |
Filed Date | 2022-09-01 |
United States Patent
Application |
20220275976 |
Kind Code |
A1 |
Zhang; Zhiping ; et
al. |
September 1, 2022 |
Refrigeration System and Refrigerated Storage
Abstract
The present disclosure provides a refrigeration system and a
refrigerated storage including the same, relating to the technical
field of refrigeration equipment, and solving the technical
problems of a high compressor pressure ratio, a reduced
refrigeration coefficient and a high exhaust temperature in a
refrigerated storage. The refrigeration system includes at least
two sets of refrigerant compression devices, a refrigerant
evaporation device and a flow path switching valve set, wherein all
the refrigerant compression devices are fluidly connected to the
flow path switching valve set; the flow path switching valve set is
configured to control the refrigerant compression devices by
switching the flow path switching valve set to supply a refrigerant
to a refrigerant evaporation in an alternative manner or in series.
According to the technical solution provided by the present
disclosure, double-temperature high-efficiency refrigeration is
achieved, and the energy efficiency of the refrigeration system is
improved.
Inventors: |
Zhang; Zhiping; (Zhuhai,
Guangdong, CN) ; Zhou; Wei; (Zhuhai, Guangdong,
CN) ; Long; Zhongkeng; (Zhuhai, Guangdong, CN)
; Luo; Chiliang; (Zhuhai, Guangdong, CN) ; Lian;
Haomin; (Zhuhai, Guangdong, CN) ; Ma; Ningfang;
(Zhuhai, Guangdong, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Gree Electric Appliances, Inc. of Zhuhai |
West Jinji Road, Qianshan |
|
CN |
|
|
Family ID: |
1000006391780 |
Appl. No.: |
17/627043 |
Filed: |
June 28, 2020 |
PCT Filed: |
June 28, 2020 |
PCT NO: |
PCT/CN2020/098447 |
371 Date: |
January 13, 2022 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25B 2400/06 20130101;
F25B 5/04 20130101; F25B 41/20 20210101; F25B 41/40 20210101; F25B
5/02 20130101 |
International
Class: |
F25B 5/02 20060101
F25B005/02; F25B 5/04 20060101 F25B005/04; F25B 41/20 20060101
F25B041/20; F25B 41/40 20060101 F25B041/40 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 23, 2019 |
CN |
201910897189.1 |
Claims
1. A refrigeration system, comprising: at least two sets of
refrigerant compression devices, wherein each of the refrigerant
compression devices is configured to compress a refrigerant; a
refrigerant evaporation device; and a flow path switching valve
set, wherein all the refrigerant compression devices are fluidly
connected to the flow path switching valve set, the flow path
switching valve set is configured to cause the refrigerant
compression devices by means of switching the flow path switching
valve set to supply a refrigerant to the refrigerant evaporation
device in an alternative manner or in series.
2. The refrigeration system according to claim 1, wherein each set
of refrigerant compressing devices has different compression
ratios.
3. The refrigeration system according to claim 2, wherein when all
the refrigerant compression devices supply refrigerants in series,
the compression ratio of the refrigerant compressing device located
downstream is greater than the compression ratio of the refrigerant
compressing device located upstream.
4. The refrigeration system according to claim 1, further
comprising: a cold supply switching valve set fluidly connected to
the flow path switching valve set; and at least two refrigerant
evaporation devices, wherein the cold supply switching valve set is
configured to cause the refrigerant by the cold supply switching
valve set to flow towards at least one refrigerant evaporation
device.
5. The refrigeration system according to claim 4, wherein there are
two sets of refrigerant compression devices, namely a first cold
supply assembly and a second cold supply assembly; an outlet
pipeline of the first cold supply assembly is fluidly connected to
the flow path switching valve set, and an inlet pipeline and an
outlet pipeline of the second cold supply assembly are both fluidly
connected to the flow path switching valve set to form a
circulation loop; the cold supply switching valve set comprises a
first supply pipeline and a second supply pipe; one end of the
first supply pipeline is fluidly connected to the flow path
switching valve set and the other end of the first supply pipeline
flows back to the first cold supply assembly after passing through
an evaporator of one refrigerant evaporation device; and one end of
the second supply pipeline is fluidly connected to the cold supply
switching valve set and the other end of the second supply pipeline
is fluidly connected to the flow path switching valve set by an
evaporator of the other refrigerant evaporation device.
6. The refrigeration system according to claim 5, wherein the first
cold supply assembly comprises a first compressor, and the second
cold supply assembly comprises a second compressor and a
condenser.
7. The refrigeration system according to claim 6. wherein the flow
path switching valve set comprises a cooler and a first throttle
valve; an outlet pipeline of the first compressor communicates with
the cooler; an inlet pipeline and an outlet pipeline of the second
compressor both communicate with the cooler; and the first throttle
valve is arranged on a pipeline between the condenser and the
cooler.
8. The refrigeration system according to claim 7, wherein the
outlet pipeline of the first compressor extends below a liquid
level in the cooler; two ends of the circulation loop are
respectively connected to two positions on the cooler located above
the liquid level in the cooler; and the second supply pipeline and
the first supply pipeline are respectively connected to two
positions on the cooler located below the liquid level in the
cooler.
9. The refrigeration system according to claim 7, wherein the cold
supply switching valve set further comprises a second throttle
valve and a pump; the second throttle valve is arranged on the
first supply pipeline; and the pump is arranged on the second
supply pipeline.
10. The refrigeration system according to claim 1, wherein the
refrigerant compressing device comprises: a compressor, comprising
a first fluid outlet and a first fluid inlet; a cooler, comprising
a second fluid inlet, a second fluid outlet, a third fluid inlet
and a fourth fluid outlet, the first fluid outlet communicating
with the second fluid inlet, and the second fluid outlet
communicating with the first fluid inlet; and a second compressor,
comprising a fourth fluid inlet and a fourth fluid outlet, the
fourth fluid outlet communicating with the fourth fluid inlet, and
the fourth fluid outlet communicating with the third fluid
inlet.
11. The refrigeration system according to claim 10, wherein the
fluid path switching valve set comprises: a first throttle valve,
arranged on a pipeline between the fourth fluid outlet and the
third fluid inlet; and a second throttle valve, arranged on a
pipeline between the second fluid outlet and the first fluid
inlet.
12. The refrigeration system according to claim 11, wherein the
refrigerant compressing device further comprises: a condenser,
arranged between the first throttle valve and the second
compressor.
13. The refrigeration system according to claim 11, wherein the
refrigerant evaporation device comprises: a first evaporator,
comprising a liquid inlet and a gas outlet, the liquid inlet
communicating with the second fluid outlet, and the gas outlet
communicating with a fifth fluid inlet of the cooler; and a second
evaporator, arranged between the second throttle valve and the
first fluid inlet.
14. A refrigerated storage, comprising: a freezing storage; a
refrigeration storage; and a refrigeration system comprising: at
least two sets of refrigerant compression devices, wherein each of
the refrigerant compression devices is configured to compress a
refrigerant; a refrigerant evaporation device; and a flow path
switching valve set, wherein all the refrigerant compression
devices are fluidly connected to the flow path switching valve set,
the flow path switching valve set is configured to cause the
refrigerant compression devices by means of switching the flow path
switching valve set to supply a refrigerant to the refrigerant to
the refrigerant evaporation device in an alternative manner or in
series; wherein the refrigeration system is connected to the
freezing storage and the refrigeration storage.
15. The refrigerated storage according to claim 14, wherein the
refrigerated storage has three refrigeration modes, namely, a
refrigeration mode for the freezing storage, a dual-refrigeration
mode for both of the freezing storage and the refrigeration
storage, and a refrigeration mode for the refrigeration storage.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The application is the United States national phase of
International Application No. PCT/CN2020/098447 filed Jun. 28,
2020, and claims priority to Chinese Patent Application No.
201910897189.1, filed on Sep. 23, 2019, the disclosures of which
are hereby incorporated by reference in their entirety.
BACKGROUND
Field of the Invention
[0002] The present disclosure relates to the technical field of
refrigeration equipment, and in particular to a refrigeration
system and a refrigerated storage.
Description of Related Art
[0003] The refrigerated storage usually comprises a freezing room
and a refrigerating room, the temperature of the freezing room is
-18.degree. C., and the temperature of the refrigerating room is
0.degree. C. The current practice is to use a low-temperature
compressor to refrigerate the freezing room and use a
medium-temperature compressor to refrigerate the refrigerating
room. With the reduction of the evaporation temperature, the
pressure ratio increases. When at a high pressure ratio, the
low-temperature compressor has the problems of reduced volume
efficiency, reduced refrigeration coefficient and high exhaust
temperature.
BRIEF SUMMARY OF THE INVENTION
[0004] The present disclosure is to provide a refrigeration system
and a refrigerated storage, so as to improve the phenomena of high
compressor pressure ratio, reduced refrigeration coefficient and
high exhaust temperature in the refrigerated storage in related
art.
[0005] Some embodiments of the present disclosure provide a
refrigeration system, including: at least two sets of refrigerant
compression devices, wherein each of the refrigerant compression
devices is configured to compress a refrigerant; a refrigerant
evaporation device; and a flow path switching valve set, wherein
all the refrigerant compression devices are fluidly connected to
the flow path switching valve set, the flow path switching valve
set is configured to control the refrigerant compression devices by
switching the flow path switching valve set to supply a refrigerant
to the refrigerant evaporation device in an alternative manner or
in series.
[0006] In some embodiments, each set of refrigerant compressing
device has different compression ratios.
[0007] In some embodiments, when all the refrigerant compression
devices supply refrigerants in series, the compression ratio of the
refrigerant compressing device located downstream is greater than
the compression ratio of the refrigerant compressing device located
upstream.
[0008] In some embodiments, the refrigeration system further
includes: a cold supply switching valve set fluidly connected to
the flow path switching valve set; and at least two refrigerant
evaporation devices, wherein the cold supply switching valve set is
configured to control the refrigerant by the cold supply switching
valve set to flow towards at least one refrigerant evaporation
device.
[0009] In some embodiments, there are two sets of refrigerant
compression devices, namely a first cold supply assembly and a
second cold supply assembly; an outlet pipeline of the first cold
supply assembly is fluidly connected to the flow path switching
valve set, and an inlet pipeline and an outlet pipeline of the
second cold supply assembly are both fluidly connected to the flow
path switching valve set to form a circulation loop; the cold
supply switching valve set includes a first supply pipeline and a
second supply pipe; one end of the first supply pipeline is fluidly
connected to the flow path switching valve set and the other end of
the first supply pipeline flows back to the first cold supply
assembly after passing through an evaporator of one refrigerant
evaporation device; and one end of the second supply pipeline is
connected to the cold supply switching valve set and the other end
of the second supply pipeline is fluidly connected to the flow path
switching valve set by an evaporator of the other refrigerant
evaporation device.
[0010] In some embodiments, the first cold supply assembly includes
a first compressor, and the second cold supply assembly includes a
second compressor and a condenser.
[0011] In some embodiments, the flow path switching valve set
includes a cooler and a first throttle valve; an outlet pipeline of
the first compressor communicates with the cooler; an inlet
pipeline and an outlet pipeline of the second compressor both
communicate with the cooler; and the first throttle valve is
arranged on a pipeline between the condenser and the cooler.
[0012] In some embodiments, the outlet pipeline of the first
compressor extends below a liquid level in the cooler; two ends of
the circulation loop are both connected to a position above the
liquid level in the cooler; two ends of the circulation loop are
respectively connected to two positions on the cooler located above
the liquid level in the cooler; and the second supply pipeline and
the first supply pipeline are respectively connected to two
positions on the cooler located below the liquid level in the
cooler.
[0013] In some embodiments, the cold supply switching valve set
further includes a second throttle valve and a pump; the second
throttle valve is arranged on the first supply pipeline; and the
pump is arranged on the second supply pipeline.
[0014] In some embodiments, the refrigerant compressing device
includes: a compressor, provided with a first fluid outlet and a
first fluid inlet; a cooler, provided with a second fluid inlet, a
second fluid outlet, a third fluid inlet and a fourth fluid outlet,
wherein the first fluid outlet communicates with the second fluid
inlet, and the second fluid outlet communicates with the first
fluid inlet; and a second compressor, provided with a fourth fluid
inlet and a fourth fluid outlet, wherein the fourth fluid outlet
communicates with the fourth fluid inlet, and the fourth fluid
outlet communicates with the third fluid inlet.
[0015] In some embodiments, the flow path switching valve set
includes: a first throttle valve, arranged on a pipeline between
the fourth fluid outlet and the third fluid inlet; and a second
throttle valve, arranged on a pipeline between the second fluid
outlet and the first fluid inlet.
[0016] In some embodiments, the refrigerant compressing device
further includes: a condenser, arranged between the first throttle
valve and the second compressor.
[0017] In some embodiments, the refrigerant evaporation device
includes: a first evaporator, provided with a liquid inlet and a
gas outlet, wherein the liquid inlet communicates with the second
fluid outlet, and the gas outlet communicates with a fifth fluid
inlet of the cooler; and a second evaporator, arranged between the
second throttle valve and the first fluid inlet.
[0018] Some other embodiments of the present disclosure provide a
refrigerated storage, including: a freezing storage; a
refrigeration storage; and the refrigeration system provided by any
technical solution of the present disclosure, wherein the
refrigeration system is connected to the freezing storage and the
refrigeration storage.
[0019] In some embodiments, the refrigerated storage has three
refrigeration modes, namely, a refrigeration mode for the freezing
storage, a dual-refrigeration mode for both the freezing storage
and the refrigeration storage, and a refrigeration mode for the
refrigeration storage.
[0020] The refrigeration system provided by the present disclosure
includes at least two sets of refrigerant compression devices and a
flow path switching valve set, wherein the flow path switching
valve set can control all the refrigerant compression devices to
supply refrigerants for the refrigerant evaporation device in an
alternative manner or in series, two compressors form one set of
refrigeration system to supply cold for the freezing room and the
refrigerating room at the same time, and the first compressor is
compressed to an intermediate pressure (the pressure of the
refrigerating room); with the reduction of the pressure ratio of
each stage, the volume efficiency of the compressor can be
improved, so that the energy efficiency of the refrigeration system
can be improved; the second low-temperature compressor is started
according to different storage temperatures, so the problem of low
energy efficiency of the low-temperature refrigerated storage is
solved; and the first compressor and the second compressor are
connected in series, a cooler is increased in the middle, and the
corresponding refrigerant compressing device is started according
to different use conditions, so that double-temperature
high-efficiency refrigeration is realized, and the energy
efficiency of the refrigeration system is improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] To describe the technical solutions in the embodiments of
the present disclosure or related art more clearly, the following
briefly describes the accompanying drawings required for describing
the embodiments or the related art. Apparently, the accompanying
drawings in the following description show merely some embodiments
of the present disclosure, and a person of ordinary skill in the
art may still derive other drawings from these accompanying
drawings without creative efforts.
[0022] FIG. 1 is a schematic structural diagram of a refrigeration
system according to an embodiment of the present disclosure.
[0023] FIG. 2 is a schematic diagram of a medium flow direction
when a refrigeration system provided by some embodiments of the
present disclosure is in a refrigeration mode for the freezing
storage.
[0024] FIG. 3 is a schematic diagram of a medium flow direction
when a refrigeration system provided by some embodiments of the
present disclosure is in a dual-refrigeration mode for both of the
freezing storage and the refrigeration storage.
[0025] FIG. 4 is a schematic diagram of a medium flow direction
when a refrigeration system provided by some embodiments of the
present disclosure is in a refrigeration mode for the refrigeration
storage.
[0026] In the drawings: 1. First compressor; 2. Second compressor;
3. Cooler; 4. Condenser; 5. First throttle valve; 6. Pump; 7.
Second throttle valve; 8. Circulation loop; 9. First supply
pipeline; 10. Second supply pipeline; 100. First evaporator; 200.
Second evaporator; 30. Refrigerant compressing device; 40. Flow
path switching valve set; 50. Cold supply switching valve set; 60.
Refrigerant evaporation device; 301. First cold supply assembly;
302. Second cold supply assembly.
DETAILED DESCRIPTION OF THE INVENTION
[0027] Some embodiments of the present disclosure provide a
refrigeration system, including a flow path switching valve set 40
and at least two sets of refrigerant compression devices 30,
wherein all the refrigerant compression devices 30 are fluidly
connected to the flow path switching valve set 40 through fluid.
All the refrigerant compression devices 30 are controlled through
the flow path switching valve set 40 to supply refrigerants for the
refrigerant evaporation device in an alternative manner or in
series. That is, the flow path switching valve set 40 controls
whether each refrigerant compressing device 30 is in the
circulation loop by controlling the communicating and disconnected
states of each valve, so that at least one of the refrigerant
compression devices 30 communicates with the circulation loop, and
the refrigerant compressing device 30 in the communicating state
provides a refrigerant for the refrigerant evaporation device. The
flow path switching valve set 40 may also connect part or all of
the refrigerant compression devices 30 in series, so as to provide
the required refrigerant for the refrigerant evaporation device.
The series connection means that the refrigerant sequentially
passes through each refrigerant compressing device 30.
[0028] In some embodiments, different refrigerant compression
devices 30 have different compression ratios.
[0029] In some embodiments, when all the refrigerant compression
devices 30 supply the refrigerant in series, in a medium flowing
direction, the compression ratio of the refrigerant compressing
device 30 located on a rear side is greater than the compression
ratio of the refrigerant compressing device 30 located on a front
side.
[0030] In some embodiments, the refrigeration system further
includes a cold supply switching valve set 50 fluidly connected to
the flow path switching valve set 40. There are at least two
refrigerant evaporation devices, and the refrigerant can be
controlled by the cold supply switching valve set 50 to flow
towards any one of part or all of the refrigerant evaporation
devices.
[0031] As shown in FIG. 1, in one embodiment of the present
disclosure, there are two sets of refrigerant compression devices
30, namely a first cold supply assembly 301 and a second cold
supply assembly 302; and a medium temperature provided by the first
cold supply assembly 301 is less than a medium temperature provided
by the second cold supply assembly 302. An outlet pipeline of the
first cold supply assembly 301 is fluidly connected to the flow
path switching valve set 40, and an inlet pipeline and an outlet
pipeline of the second cold supply assembly 302 are both connected
to the flow path switching valve set 40 to form a circulation loop
8. The cold supply switching valve set 50 includes a first supply
pipeline 9 and a second supply pipeline 10. One end of the first
supply pipeline 9 is connected to the flow path switching valve set
40 and the other end of the first supply pipeline 9 flows back to
the first cold supply assembly 301 after passing through an
evaporator of one refrigerant evaporation device; and one end of
the second supply pipeline 10 is fluidly connected to the flow path
switching valve set 40 and the other end of the second supply
pipeline 10 is fluidly connected to the flow path switching valve
set 40 by an evaporator of other one refrigerant evaporation
device.
[0032] Specifically, the first cold supply assembly 301 includes a
first compressor 1, and the second cold supply assembly 302
includes a second compressor 2 and a condenser 4. The second
compressor 2 and the condenser 4 are both connected through a
pipeline.
[0033] The flow path switching valve set 40 includes a cooler 3 and
a first throttle valve 5, an outlet pipeline of the first
compressor 1 communicates with the cooler 3, an inlet pipeline and
an outlet pipeline of the second compressor 2 both communicate with
the cooler 3, and the first throttle valve 5 is arranged on a
pipeline between the condenser 4 and the cooler 3.
[0034] The outlet pipeline of the first compressor 2 extends below
a liquid level in the cooler 3, and two ends of the circulation
loop 8 are respectively connected to two positions on the cooler 3
located above the liquid level in the cooler 3; and the second
supply pipeline 301 and the first supply pipeline 9 are
respectively connected to two positions on the cooler 3 located
below the liquid level in the cooler 3. The cooler 3 is a flash
evaporator, which is a product in related art and purchased from
the external market.
[0035] The flow path switching valve set 40 further includes a
second throttle valve 7 and a pump 6, wherein the second throttle
valve 7 is arranged on the first supply pipeline 9; and the pump 6
is arranged on the second supply pipeline 10.
[0036] In some embodiments, the refrigerant compressing device 30
includes a first compressor 1, a second compressor 2 and a cooler
3. The compressor 1 is provided with a first fluid outlet 101 and a
first fluid inlet 102. The cooler 3 is provided with a second fluid
inlet 31, a second fluid outlet 32, a third fluid inlet 33 and a
fourth fluid outlet 34. The first fluid outlet 101 communicates
with the second fluid inlet 31, and the second fluid outlet 32
communicates with the first fluid inlet 102. The second compressor
2 is provided with a fourth fluid inlet 21 and a fourth fluid
outlet 22; and the fourth fluid outlet 34 communicates with the
fourth fluid inlet 21, and the fourth fluid outlet 22 communicates
with the third fluid inlet 33. By controlling the valve position of
the flow path switching valve set 40, the first compressor 1 and
the second compressor 2 are either or both located in the
circulation loop. Specifically, in the refrigeration mode for the
refrigeration storage, only the second compressor 2 works. In the
dual-refrigeration mode for both of the refrigeration storage and
the freezing storage, the first compressor 1 and the second
compressor 2 work at the same time; moreover, the refrigerant
obtained after secondary compression of the first compressor 1 and
the second compressor 2 is provided to the first evaporator 100 in
the refrigeration storage and the second evaporator 200 in the
freezing storage at the same time. In the refrigeration mode for
the refrigeration storage, the first compressor 1 and the second
compressor 2 work at the same time; moreover, the refrigerant
obtained after secondary compression of the first compressor 1 and
the second compressor 2 is only provided to the second evaporator
200 in the freezing storage.
[0037] Referring to FIG. 1, in some embodiments, the flow path
switching valve set 40 includes a first throttle valve 5 and a
second throttle valve 7. The first throttle valve 5 is arranged on
a pipeline between the fourth fluid outlet 22 and the third fluid
inlet 33. The second throttle valve 7 is arranged on a pipeline
between the second fluid outlet 32 and the first fluid inlet 102.
By controlling the conduction status of the first throttle valve 5
and the second throttle valve 7, it is simple and convenient to
control whether the first compressor 1 and the second compressor 2
are in the circulation loop.
[0038] Referring to FIG. 1, in some embodiments, the refrigerant
compressing device 30 further includes a condenser 4, and the
condenser 4 is arranged between the first throttle valve 5 and the
second compressor 2.
[0039] Referring to FIG. 1, in some embodiments, the refrigerant
evaporation device 60 includes a first evaporator 100 and a second
evaporator 200. The first evaporator 100 is provided with a liquid
inlet 100a and a gas outlet 100b, the liquid inlet 100a
communicates with the second fluid outlet 32, and the gas outlet
100b communicates with a fifth fluid inlet 35 of the cooler 3. The
second evaporator 200 is arranged between the second throttle valve
7 and the first fluid inlet 102.
[0040] Some embodiments of the present disclosure provide a
refrigerated storage, including a freezing storage, a refrigeration
storage and a refrigeration system. The refrigeration system is
connected to the freezing storage and the refrigeration storage.
The first evaporator 100 is arranged in the refrigeration storage,
and the second evaporator 200 is arranged in the freezing storage.
The first supply pipeline 9 is connected to the second evaporator
200, and the second supply pipeline 10 is connected to the first
evaporator 100.
[0041] As shown in FIG. 2 to FIG. 4, the refrigerated storage has
three refrigeration modes, namely a refrigeration mode for the
freezing storage, a dual-refrigeration mode for both of the
freezing storage and the refrigeration storage, and a refrigeration
mode for the refrigeration storage. In the refrigeration mode for
the freezing storage, only the freezing storage is refrigerated,
and the refrigeration storage is not refrigerated. In the
dual-refrigeration mode for both of the freezing storage and the
refrigeration storage, the freezing storage and the refrigeration
storage are refrigerated. In the refrigeration mode for the
refrigeration storage, only the refrigeration storage is
refrigerated, and the freezing storage is not refrigerated.
[0042] The refrigeration system provided by some embodiments of the
present disclosure adopts two compressors, that is, a first
compressor 1 and a second compressor 2 are connected in series to
form a bipolar system. The second compressor 2 may operate
independently, the second compressor 2 and the first compressor 1
may operate at the same time, the first compressor 1 and the second
compressor 2 are connected in series, and the first compressor 1 is
compressed to an intermediate pressure (the pressure of the
refrigerating room); with the reduction of the pressure ratio of
each stage, the volume efficiency of the compressor can be
improved, so that the energy efficiency of the refrigeration system
can be improved; the first compressor 1 and the second compressor 2
are started according to different storage temperatures to solve
the problem of low energy efficiency of the low-temperature
refrigerated storage; and the first compressor 1 and the second
compressor 2 are connected in series, the cooler 3 is increased in
the middle, and the corresponding compressing device is started
according to different use conditions, so that double-temperature
high-efficiency refrigeration is realized, and the energy
efficiency of the refrigeration system is improved.
[0043] The following examples are given for detailed
description.
[0044] Firstly, the refrigeration mode for the freezing storage is
introduced. As shown in FIG. 2, in this mode, the freezing storage
needs refrigeration, and the refrigeration storage does not need
refrigeration. As shown in Table 1, the on/off status of each part
of the refrigeration system is as follows: the first compressor 1,
the second compressor 2, the first throttle valve 5 and the second
throttle valve 7 are turned on, and the pump 6 is turned off; and
the first compressor 1 is compressed to an intermediate pressure
and discharges the compressed gas to the cooler 3 for cooling. The
second compressor 2 absorbs the saturated gas in the cooler 3 and
discharges the compressed gas to the condenser 4. A gas-liquid
mixture formed after primary throttling of the first throttle valve
5 enters the cooler 3, gas is separated in the cooler 3, the
separated saturated gas is sucked by the second compressor 2 again
for compression, and saturated liquid in the cooler 3 is discharged
to the second evaporator 200 through secondary throttling of the
second throttle valve 7.
TABLE-US-00001 TABLE 1 First Second First throttle Second Pump
throttle compressor 1 valve 5 compressor 2 6 valve 7 On On On Off
On
[0045] Secondly, the dual-refrigeration mode for both of the
freezing storage and the refrigeration storage is introduced. As
shown in FIG. 3, in this mode, the freezing storage and the
refrigeration storage both need refrigeration. At this time, as
shown in Table 2, the on/off status of each part of the
refrigeration system is as follows: the first compressor 1, the
second compressor 2, the first throttle valve 5, the second
throttle valve 7 and the pump 6 are turned on. The first compressor
1 compresses a medium to an intermediate pressure and discharges
gas to the cooler 3 for cooling. The pump 6 is turned on to supply
liquid for the first evaporator 100, and the liquid absorbs heat of
the refrigeration storage and returns to the cooler 3 for gas and
liquid separation. Low-pressure exhaust and gas compressed exhaust
separated in the cooler 3 after evaporation of the refrigeration
storage are absorbed by the second compressor 2 to the condenser 4
and then flow to the cooler 3 after the primary throttling of the
first throttle valve 5, and saturated liquid is discharged to the
second evaporator 200 through the secondary throttling of the
second throttle valve 7.
TABLE-US-00002 TABLE 2 First Second First throttle Second throttle
compressor 1 valve 5 compressor 2 Pump 6 valve 7 On On On On On
[0046] Finally, the refrigeration mode for the refrigeration
storage is introduced. As shown in FIG. 4, in this mode, only the
refrigeration storage needs refrigeration, and the freezing storage
does not need refrigeration. As shown Table 3, the on/off status of
each part of the refrigeration system is as follows: the second
compressor 2, the first throttle valve 5 and the pump 6 are turned
on. The first compressor 1 and the second throttle valve 7 are both
turned off; the second compressor 2 compresses the exhaust to the
condenser 4, the pump 6 is turned on to supply liquid for the first
evaporator 100, and the liquid absorbs the heat of the
refrigeration storage to return to the cooler 3 for gas and liquid
separation; and after the second compressor 2 absorbs gas separated
in the cooler 3 after evaporation of the refrigeration storage for
compression to perform the next refrigeration circulation.
TABLE-US-00003 TABLE 3 First Second First throttle Second [0001]
throttle compressor 1 valve 5 compressor 2 Pump 6 valve 7 Off On On
On Off
[0047] In the present disclosure, unless otherwise clearly
specified and limited, the terms "mounting", "interconnection",
"connection" and "fixation" etc. are intended to be understood in a
broad sense. For example, the "connection" may be a fixed
connection, removable connection or integral connection; may be a
mechanical connection or electrical connection; may be a direct
connection or indirect connection using a medium; and may be a
communication or interaction between two elements, unless otherwise
explicitly limited. For those of ordinary skill in the art,
specific meanings of the foregoing terms in the present disclosure
may be understood according to specific circumstances.
[0048] In the description of the present disclosure, it should be
understood that an azimuth or position relationship indicated by
terms "center", "longitudinal", "transverse", "front", "rear",
"left", "right", "vertical", "horizontal", "top", "bottom",
"inner", "outer" and the like is an azimuth or position
relationship based on the accompanying draws, which is only for
facilitating description of the present disclosure and simplifying
description, but does not indicate or imply that the referred
device or component must have a specific azimuth and perform
construction and operation in the specific azimuth; therefore, it
cannot be interpreted as a limitation to the protection scope of
the present disclosure.
[0049] Finally, it should be noted that the above embodiments are
merely intended to illustrate the technical solutions of the
present disclosure and are not to limit them. Although the present
disclosure has been illustrated in detail with reference to the
preferred embodiments, those of ordinary skill in the art should
understand that modification can be made on the specific
embodiments of the present disclosure and equivalent replacement
can be made on part of the technical features; and the modification
and the equivalent replacement should be covered within the
protection scope of the technical solutions claimed by the present
disclosure without departing from the spirit of the technical
solutions of the present disclosure.
* * * * *