WO2021057137A1

WO2021057137A1 - Refrigeration system and refrigerated storage

Info

Publication number: WO2021057137A1
Application number: PCT/CN2020/098447
Authority: WO
Inventors: 张治平; 周巍; 龙忠铿; 罗炽亮; 练浩民; 马宁芳
Original assignee: 珠海格力电器股份有限公司
Priority date: 2019-09-23
Filing date: 2020-06-28
Publication date: 2021-04-01
Also published as: CN110579064A; US20220275976A1

Abstract

The present disclosure provides a refrigeration system and a refrigerated storage comprising same, relating to the technical field of refrigeration devices, 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 comprises at least two refrigerant compressing devices, a refrigerant evaporating device and a flow path switching valve set, the refrigerant compressing devices both being connected to the flow path switching valve set, and the flow path switching valve set being configured to control the refrigerant compressing devices by means of switching of the flow path switching valve set to supply a refrigerant to a refrigerant demand unit in an alternative manner or in series. The technical solution provided in the present disclosure achieves double-temperature high-efficiency refrigeration and improves the energy efficiency of the refrigeration system.

Description

Refrigeration system and cold storage

This application is based on the application whose CN application number is 201910897189.1 and the application date is September 23, 2019. Basis, and claiming its priority, the disclosure of the CN application is hereby incorporated into this application as a whole.

Technical field

The present disclosure relates to the technical field of refrigeration equipment, in particular to a refrigeration system and a cold storage.

Background technique

The cold storage usually includes a freezer room and a cold storage room. The temperature of the freezer room is -18℃ and the temperature of the cold storage room is 0℃. The current practice is to use a low-temperature compressor to cool the freezing room and a medium-temperature compressor to cool the cold room. As the evaporation temperature decreases, the pressure ratio increases. At the high pressure ratio, the low-temperature compressor has the problems of reduced volumetric efficiency, reduced refrigeration coefficient, and high exhaust temperature.

Summary of the invention

The purpose of the present disclosure is to provide a refrigeration system and a cold storage to improve the phenomenon of high compressor pressure ratio, low refrigeration coefficient, and high exhaust temperature in the cold storage of the related art.

Some embodiments of the present disclosure provide a refrigeration system, including:

At least two sets of refrigerant compression devices, each of the refrigerant compression devices is configured to compress refrigerant;

Refrigerant evaporator; and

A flow path switching valve group, all of the refrigerant compression devices are connected to the flow path switching valve group; the flow path switching valve group is configured to control the refrigerant compression device by switching the flow path switching valve group The refrigerant is supplied to the refrigerant demand components in an alternative or in series mode.

In some embodiments, the compression ratio of each set of the refrigerant compression device is different.

In some embodiments, when all the refrigerant compression devices supply refrigerant in series, the compression ratio of the refrigerant compression device located downstream is greater than the compression ratio of the refrigerant compression device located upstream.

In some embodiments, the refrigeration system further includes:

A cooling supply switching valve group connected to the flow path switching valve group; and

At least two refrigerant evaporating devices, and the cooling supply switching valve group is configured to control the flow of refrigerant to at least one of the refrigerant evaporating devices through the cooling supply switching valve group.

In some embodiments, the number of the refrigerant compression device is two sets, namely a first cooling component and a second cooling component; the outlet pipe of the first cooling component and the flow switching valve group Connected, the inlet pipeline and the outlet pipeline of the second cooling assembly are both connected with the flow path switching valve group to form a circulation loop;

The cooling supply switching valve group includes a first supply pipeline and a second supply pipeline; one end of the first supply pipeline is connected to the flow path switching valve group, and the other end passes through an evaporator of a refrigerant evaporation device and then flows back To the first cooling assembly; one end of the second supply pipeline is connected to the cooling switching valve group, and the other end passes through the evaporator of another refrigerant evaporation device and then flows back into the flow path switching valve group.

In some embodiments, wherein the first cooling component includes a first compressor, and the second cooling component includes a second compressor and a condenser.

In some embodiments, wherein the flow path switching valve group includes a cooler and a first throttle valve, the outlet pipe of the first compressor is in communication with the cooler, and the inlet of the second compressor Both the pipeline and the outlet pipeline communicate with the cooler, and the first throttle valve is arranged on the pipeline between the condenser and the cooler.

In some embodiments, wherein the outlet pipe of the first compressor extends below the liquid level in the cooler, and both ends of the circulation loop are connected at positions above the liquid level in the cooler; The second supply pipeline and the first supply pipeline are both connected at a position below the liquid level of the cooler.

In some embodiments, the cooling supply switching valve set further includes a second throttle valve and a pump, the second throttle valve is provided on the first supply line, and the pump is provided on the first supply line. 2. On the supply pipeline.

In some embodiments, wherein the refrigerant compression device includes:

The first compressor has a first fluid outlet and a first fluid inlet;

The cooler has a second fluid inlet, a second fluid outlet, a third fluid inlet, and a fourth fluid outlet; the first fluid outlet is in communication with the second fluid inlet, and the second fluid outlet is connected to the first fluid outlet. Fluid inlet communication, and

The second compressor has a fourth fluid inlet and a fourth fluid outlet; the fourth fluid outlet is in communication with the fourth fluid inlet, and the fourth fluid outlet is in communication with the third fluid inlet.

In some embodiments, wherein the flow path switching valve group includes:

The first throttle valve is provided in the pipeline between the fourth fluid outlet and the third fluid inlet; and

The second throttle valve is arranged in the pipeline between the second fluid outlet and the first fluid inlet.

In some embodiments, wherein the refrigerant compression device further includes:

The condenser is arranged between the first throttle valve and the second compressor.

In some embodiments, the refrigerant evaporation device includes:

The first evaporator has a liquid inlet and an air outlet, the liquid inlet is in communication with the second fluid outlet, and the air outlet is in communication with the fifth inlet of the cooler; and

The second evaporator is arranged between the second throttle valve and the first fluid inlet.

Other embodiments of the present disclosure provide a cold storage, which includes:

freezer;

Cold storage; and

In the refrigeration system provided by any technical solution of the present disclosure, the refrigeration system is connected to the freezer and the cold storage.

In some embodiments, the cold storage has three cooling modes, namely, a freezer cooling mode, a freezer and a cold storage simultaneous cooling mode, and a cold storage cooling mode.

The refrigeration system provided by the present disclosure includes at least two sets of refrigerant compression devices and a flow path switching valve group. Through the flow path switching valve group, all refrigerant compression devices can be controlled to supply refrigerant to the refrigerant evaporation device in an alternative or series manner. Two compressors form a set of refrigeration system, which provides cooling to the freezer room and the cold storage room at the same time. The first compressor compresses to the intermediate pressure (the pressure of the cold storage room); as the pressure ratio of each stage decreases, the volumetric efficiency of the compressor can be improved , The energy efficiency of the refrigeration system is improved; the low-temperature and second compressors are turned on according to the temperature of different warehouses, which solves the problem of low energy efficiency of low-temperature cold storage. The first compressor and the second compressor are connected in series, and the cooler is added in the middle, according to different usage conditions. Turn on the corresponding refrigerant compression device to achieve dual-temperature high-efficiency refrigeration and improve the energy efficiency of the refrigeration system.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present disclosure or related technologies, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or related technologies. Obviously, the accompanying drawings in the following description are merely the present invention. For some of the disclosed embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

Figure 1 is a schematic structural diagram of a refrigeration system provided by some embodiments of the present disclosure;

Fig. 2 is a schematic diagram of medium flow when the refrigeration system provided by some embodiments of the present disclosure is in the refrigeration mode of the freezer;

FIG. 3 is a schematic diagram of medium flow when the refrigeration system provided by some embodiments of the present disclosure is in the simultaneous cooling mode of the freezer and the cold storage;

Fig. 4 is a diagram showing the flow of the medium when the refrigeration system provided by some embodiments of the present disclosure is in the refrigeration mode of the refrigerator.

In the figure: 1. First compressor; 2. Second compressor; 3. Cooler; 4. Condenser; 5. First throttle valve; 6. Pump; 7. Second throttle valve; 8. Circulation Circuit; 9, the first supply pipeline; 10, the second supply pipeline; 100, the first evaporator; 200, the second evaporator;

30. Refrigerant compression device; 40. Flow path switching valve group; 50. Cooling supply switching valve group; 60. Refrigerant evaporation device;

301. The first cooling component; 302. The second cooling component.

detailed description

Some embodiments of the present disclosure provide a refrigeration system that includes a flow path switching valve group 40 and at least two sets of refrigerant compression devices 30, and all the refrigerant compression devices 30 are fluidly connected to the flow path switching valve group 40. The flow path switching valve group 40 controls all the refrigerant compression devices 30 to supply refrigerant to the refrigerant evaporating devices in an alternative or series manner. In other words, the flow path switching valve group 40 controls whether each refrigerant compression device 30 is in the circulation circuit by controlling the communication and disconnection states of its own valves, so that at least one of the refrigerant compression devices 30 is in communication with the circulation circuit. The refrigerant compression device 30 in the communicating state provides refrigerant for the refrigerant evaporating device. The flow path switching valve group 40 can also connect part or all of the refrigerant compression device 30 in series to provide the refrigerant required by the refrigerant evaporation device. The so-called series connection means that the refrigerant passes through each refrigerant compression device 30 in sequence.

In some embodiments, different refrigerant compression devices 30 have different compression ratios.

In some embodiments, when all the refrigerant compression devices 30 supply refrigerant in series, the compression ratio of the refrigerant compression device 30 on the rear side is greater than the compression ratio of the refrigerant compression device 30 on the front side along the medium flow direction.

In some embodiments, the refrigeration system further includes a cooling supply switching valve group 50 connected to the flow path switching valve group 40, the number of refrigerant evaporating devices is at least two, and the cooling medium can be controlled to flow to any one, through the cooling supply switching valve group 50, Part or all of the refrigerant evaporation device.

As shown in FIG. 1, in an embodiment of the present disclosure, the number of refrigerant compression devices 30 is two sets, which are a first cooling assembly 301 and a second cooling assembly 302. The first cooling assembly 301 provides The temperature of the medium is lower than the temperature of the medium provided by the second cooling assembly 302. The outlet pipeline of the first cooling assembly 301 is connected with the flow path switching valve group 40, and the inlet pipeline and the outlet pipeline of the second cooling assembly 302 are both connected with the flow path switching valve group 40 to form a circulation circuit 8. The cooling switching valve group 50 includes a first supply line 9 and a second supply line 10. One end of the first supply pipe 9 is connected to the flow switching valve group 40, and the other end passes through the evaporator of a refrigerant evaporator and flows back to the first cooling assembly 301; one end of the second supply pipe 10 is connected to the flow switching valve group 40 Connected, the other end passes through the evaporator of another refrigerant evaporator and then flows back into the flow path switching valve group 40.

Specifically, the first cooling component 301 includes a first compressor 1, and the second cooling component 302 includes a second compressor 2 and a condenser 4. Both the second compressor 2 and the condenser 4 are connected by pipelines.

The flow path switching valve group 40 includes a cooler 3 and a first throttle valve 5. The outlet pipe of the first compressor 1 is in communication with the cooler 3, and the inlet pipe and the outlet pipe of the second compressor 2 are both connected with the cooler. 3 is connected, and the first throttle valve 5 is arranged on the pipeline between the condenser 4 and the cooler 3.

The outlet pipe of the first compressor 1 extends below the liquid level in the cooler 3, and both ends of the circulation loop 8 are connected at positions above the liquid level in the cooler 3; the second supply pipe 10 and the first supply pipe 9 are connected to the position below the liquid level of the cooler 3. The cooler 3 is a flasher, which is a related technical product and is purchased from an external market.

The flow path switching valve group 40 further includes a second throttle valve 7 and a pump 6, 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.

In some embodiments, the refrigerant compression device 30 includes a first compressor 1, a second compressor 2 and a cooler 3. The first compressor 1 has a first fluid outlet 101 and a first fluid inlet 102. The cooler 3 has 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 and the second fluid inlet 31 are in communication, and the second fluid outlet 32 is in communication with the first fluid inlet 102. The second compressor 2 has a fourth fluid inlet 21 and a fourth fluid outlet 22; the fourth fluid outlet 34 and the fourth fluid inlet 21 are in communication, and the fourth fluid outlet 22 and the third fluid inlet 33 are in communication. By controlling the valve position of the flow path switching valve group 40, the first compressor 1 and the second compressor 2 are selected or simultaneously in the circulation loop. Specifically, in the refrigerator cooling mode, only the second compressor 2 works. In the simultaneous working mode of the refrigerator and the freezer, the first compressor 1 and the second compressor 2 work at the same time, and the refrigerant after the second compression of the first compressor 1 and the second compressor 2 is supplied to the refrigerator at the same time The first evaporator 100 and the second evaporator 200 in the freezer. In the freezer-only working mode, the first compressor 1 and the second compressor 2 work at the same time, and the refrigerant after the second compression of the first compressor 1 and the second compressor 2 is only provided to the second compressor in the freezer. Evaporator 200.

Referring to FIG. 1, in some embodiments, the flow path switching valve group 40 includes a first throttle valve 5 and a second throttle valve 7. The first throttle valve 5 is provided in the pipeline between the fourth fluid outlet 22 and the third fluid inlet 33. The second throttle valve 7 is provided in the pipeline between the second fluid outlet 32 and the first fluid inlet 102. By controlling the conduction state of the first throttle valve 5 and the second throttle valve 7, it is possible to easily control whether the first compressor 1 and the second compressor 2 are in the circulation circuit.

Referring to FIG. 1, in some embodiments, the refrigerant compression device 30 further includes a condenser 4, and the condenser 4 is provided between the first throttle valve 5 and the second compressor 2.

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 has a liquid inlet 100a and an air outlet 100b. The liquid inlet 100a is in communication with the second fluid outlet 32, and the air outlet 100b is in communication with the fifth inlet 35 of the cooler 3. The second evaporator 200 is provided between the second throttle valve 7 and the first fluid inlet 102.

Some embodiments of the present disclosure provide a cold storage, including a freezer, a cold storage, and a refrigeration system. The refrigeration system is connected to the freezer and cold storage. The first evaporator 100 is installed in the refrigerator, and the second evaporator 200 is installed in the refrigerator. The first supply line 9 is connected to the second evaporator 200, and the second supply line 10 is connected to the first evaporator 100.

As shown in Figures 2 to 4, the above-mentioned cold storage has three cooling modes, namely, a freezer cooling mode, a freezer and a refrigerator simultaneous cooling mode, and a refrigerator cooling mode. When in the freezer refrigeration mode, only the freezer is refrigerated, and the refrigerator is not. When in the simultaneous cooling mode of the freezer and the cold storage, both the freezer and the cold storage are cooled. When in the cold storage refrigeration mode, only the cold storage is cooled, and the freezer is not.

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 can be operated independently or the second compressor can be operated independently. Compressor 2 and first compressor 1 run at the same time, and the two are connected in series. The first compressor 1 compresses to the intermediate pressure (pressure in the refrigerating room); as the pressure ratio of each stage decreases, the volumetric efficiency of the compressor is improved, so that The energy efficiency of the refrigeration system is improved; the first compressor 1 and the second compressor 2 are turned on according to different warehouse temperatures, which solves the problem of low energy efficiency in low-temperature cold storage. The first compressor 1 and the second compressor 2 are connected in series, and a cooler is added in the middle. 3. Turn on the corresponding refrigerant compression device according to different usage conditions to realize dual-temperature high-efficiency refrigeration and improve the energy efficiency of the refrigeration system.

The following examples are explained in detail.

First, introduce the refrigeration mode of the freezer. As shown in Figure 2, in this mode, the freezer requires refrigeration, but the refrigerator does not require refrigeration. As shown in Table 1, the switch states of the components of the refrigeration system are as follows: turn on the first compressor 1, the second compressor 2, the first throttle valve 5, the second throttle valve 7, and the pump 6 is closed; the first compressor 1 compresses To the intermediate pressure, the compressed gas is discharged to the cooler 3 for cooling. The second compressor 2 absorbs the saturated gas in the cooler 3 and compresses and discharges it to the condenser 4. After the first-stage throttling of the first throttle valve 5, a gas-liquid mixture is formed and enters the cooler 3, where the gas is separated in the cooler 3, and the separated saturated gas is again sucked by the second compressor 2 for compression and cooling The saturated liquid in the vessel 3 is discharged to the second evaporator 200 through the secondary throttling of the second throttle valve 7.

Table 1:

第一压缩机1 First compressor 1	第一节流阀5The first throttle valve 5	第二压缩机2 Second compressor 2	泵6 Pump 6	第二节流阀7The second throttle valve 7
开open	开open	开open	关turn off	开open

Secondly, introduce the cooling mode of the freezer and the cold storage at the same time. As shown in Figure 3, in this mode, both the freezer and cold storage need refrigeration. At this time, as shown in Table 2, the switch states of the components of the refrigeration system are as follows: turn on the first compressor 1, the second compressor 2, the first throttle valve 5, the second throttle valve 7, and the pump 6. The first compressor 1 compresses the medium to an intermediate pressure and discharges it to the cooler 3 for cooling. The pump 6 is turned on to supply liquid to the first evaporator 100, and the liquid absorbs the heat of the refrigerator and returns to the cooler 3 for gas-liquid separation. The second compressor 2 absorbs the low-pressure stage exhaust gas and the gas separated in the cooler 3 after evaporating from the refrigerator, compresses the exhaust gas to the condenser 4, passes through the first-stage throttling of the first throttle valve 5, and then flows to the cooler 3. The saturated liquid is discharged to the second evaporator 200 through the secondary throttling of the second throttle valve 7.

Table 2:

第一压缩机1 First compressor 1	第一节流阀5The first throttle valve 5	第二压缩机2 Second compressor 2	泵6 Pump 6	第二节流阀7The second throttle valve 7
开open	开open	开open	开open	开open

Finally, the cooling mode of the refrigerator is introduced. As shown in Figure 4, in this mode, only the refrigerator requires refrigeration, and the freezer does not require refrigeration. As shown in Table 3, the switch states of the components of the refrigeration system are as follows: turn on the second compressor 2, the first throttle valve 5, and the pump 6. The first compressor 1 and the second throttle valve 7 are both closed; the second compressor 2 compresses the exhaust gas to the condenser 4, and the pump 6 is turned on to supply liquid to the first evaporator 100. The liquid absorbs the heat from the refrigerator and returns to the cooler Gas-liquid separation is carried out in step 3; the second compressor 2 sucks the gas separated in the cooler 3 after being evaporated in the refrigerator to compress for the next refrigeration cycle.

table 3:

第一压缩机1 First compressor 1	第一节流阀5The first throttle valve 5	第二压缩机2 Second compressor 2	泵6 Pump 6	第二节流阀7The second throttle valve 7
关turn off	开open	开open	开open	关turn off

In the present disclosure, unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection. , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise specified The limit. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present disclosure can be understood according to specific circumstances.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying The referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the protection scope of the present disclosure.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: The disclosed specific implementations are modified or equivalent replacements of some technical features; without departing from the spirit of the technical solutions of the present disclosure, they should all be covered in the scope of the technical solutions claimed by the present disclosure.

Claims

A refrigeration system, including:

At least two sets of refrigerant compression devices (30), each of the refrigerant compression devices (30) is configured to compress refrigerant;

Refrigerant evaporator (60); and

The flow path switching valve group (40), all of the refrigerant compression devices (30) are connected to the flow path switching valve group (40); the flow path switching valve group (40) is configured to switch the The flow path switching valve group (40) controls the refrigerant compression device (30) to supply refrigerant to the refrigerant demand component (60) in an alternative or series manner.
The refrigeration system according to claim 1, wherein the compression ratio of each set of the refrigerant compression device (30) is different.
The refrigeration system according to claim 2, wherein when all the refrigerant compression devices (30) supply refrigerant in series, the compression ratio of the refrigerant compression device (30) located downstream is greater than that of the refrigerant located upstream The compression ratio of the compression device (30).
The refrigeration system according to claim 1, further comprising:

The cooling supply switching valve group (50) connected to the flow path switching valve group (40); and

At least two refrigerant evaporating devices (60), and the cooling supply switching valve group (50) is configured to control the flow of refrigerant to at least one of the refrigerant evaporating devices (60) through the cooling supply switching valve group (50).
The refrigeration system according to claim 4, wherein:

The number of the refrigerant compression device (30) is two, which are the first cooling component (301) and the second cooling component (302); the outlet pipeline of the first cooling component (301) and the The flow path switching valve group (40) is connected, and the inlet pipe and the outlet pipe of the second cooling assembly (302) are both connected with the flow path switching valve group (40) to form a circulation loop;

The cooling switch valve group (50) includes a first supply pipe (9) and a second supply pipe (10); one end of the first supply pipe (9) is connected to the flow path switch valve group (40). ) Connection, the other end flows back to the first cooling assembly (301) after passing through the evaporator of a refrigerant evaporator; one end of the second supply pipeline (10) is connected to the cooling switching valve group (50), and the other One end passes through an evaporator of another refrigerant evaporation device and then flows back into the flow path switching valve group (40).
The refrigeration system according to claim 5, wherein the first cooling component (301) includes a first compressor (1), and the second cooling component (302) includes a second compressor (2) and Condenser (4).
The refrigeration system according to claim 6, wherein the flow path switching valve group (40) includes a cooler (3) and a first throttle valve (5), and an outlet pipe of the first compressor (1) The inlet pipe and the outlet pipe of the second compressor (2) are both in communication with the cooler (3), and the first throttle valve (5) is provided On the pipeline between the condenser (4) and the cooler (3).
The refrigeration system according to claim 7, wherein the outlet pipe of the first compressor (1) extends below the liquid level in the cooler (3), and both ends of the circulation loop (8) Both are connected at a position above the liquid level in the cooler (3); the second supply pipe (301) and the first supply pipe (9) are both connected below the liquid level in the cooler (3) position.
The refrigeration system according to claim 7, wherein the cooling supply switching valve group (50) further comprises a second throttle valve (7) and a pump (6), and the second throttle valve (7) is arranged at On the first supply pipeline (9), the pump (6) is arranged on the second supply pipeline (10).
The refrigeration system according to claim 1, wherein the refrigerant compression device (30) comprises:

The first compressor (1) has a first fluid outlet (101) and a first fluid inlet (102);

The cooler (3) has 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) and the The second fluid inlet (31) is in communication, and the second fluid outlet (32) is in communication with the first fluid inlet (102); and

The second compressor (2) has a fourth fluid inlet (21) and a fourth fluid outlet (22); the fourth fluid outlet (34) is in communication with the fourth fluid inlet (21), and the fourth fluid inlet (21) is in communication with the fourth fluid inlet (21). The fluid outlet (22) is in communication with the third fluid inlet (33).
The refrigeration system according to claim 10, wherein the flow path switching valve group (40) comprises:

The first throttle valve (5) is provided in the pipeline between the fourth fluid outlet (22) and the third fluid inlet (33); and

The second throttle valve (7) is arranged in the pipeline between the second fluid outlet (32) and the first fluid inlet (102).
The refrigeration system according to claim 11, wherein the refrigerant compression device (30) further comprises:

The condenser (4) is arranged between the first throttle valve (5) and the second compressor (2).
The refrigeration system according to claim 11, the refrigerant evaporating device (60) comprises:

The first evaporator (100) has a liquid inlet (100a) and an air outlet (100b), the liquid inlet (100a) is in communication with the second fluid outlet (32), and the air outlet (100b) is connected to The fifth inlet (35) of the cooler (3) is in communication; and

The second evaporator (200) is arranged between the second throttle valve (7) and the first fluid inlet (102).
A kind of cold storage, which includes:

freezer;

Cold storage; and

The refrigeration system according to any one of claims 1-13, wherein the refrigeration system is connected to both the freezer and the cold storage.
The cold storage according to claim 14, wherein the cold storage has three cooling modes, namely, a freezer cooling mode, a freezer and a cold storage simultaneous cooling mode, and a cold storage cooling mode.