Refrigerating system and environmental test box

Abstract

The embodiment of the utility model discloses a refrigerating system and an environmental test box. The refrigerating system comprises a compressor, an evaporator, a condenser, an economizer and a plurality of adjusting valves, an outlet of the compressor communicates with an inlet of the condenser, an outlet of the condenser communicates with the first end of the economizer, and the second end of the economizer communicates with an air supplementing opening of the compressor; the second end of the economizer is communicated with an inlet of the compressor through at least one regulating valve, or the second end of the economizer is communicated with an inlet of the evaporator through at least one regulating valve; the third end of the economizer is communicated with the inlet of the compressor through at least one regulating valve, the fourth end of the economizer is communicated with the third end of the economizer through at least one regulating valve, the third end of the economizer is communicated with the inlet of the evaporator through at least one regulating valve, and the outlet of the evaporator is communicated with the inlet of the compressor. The refrigerating system and the environmental test box provided by the embodiment of the utility model can meet the requirement of refrigerating capacity and realize energy conservation.

Description

Technical Field

[0001] The embodiments of the utility model relate to refrigeration technology, and in particular to a refrigeration system and an environmental test box. Background Art

[0002] When the refrigeration system is working, such as raising and lowering the temperature of the environmental test chamber, the temperature of the environmental test chamber needs to meet the product heating and cooling test requirements, which requires a large cooling capacity, while also meeting the constant temperature test. At this time, the required cooling capacity is very small, so the product refrigeration load operating range is relatively wide. At the same time, long-term testing requirements make customers pay more attention to the energy consumption of the refrigeration system.

[0003] At present, the existing refrigeration systems usually use variable frequency compressors to adjust the cooling capacity output, but there is a problem of high cost. There are also solutions that use a combination of different compressor capacities or use larger fixed frequency compressors to meet larger load demands, but when the cooling capacity output is small, its energy consumption is high. Utility Model Content

[0004] The embodiments of the utility model provide a refrigeration system and an environmental test box to meet the refrigeration capacity requirements and achieve energy saving.

[0005] In a first aspect, an embodiment of the utility model provides a refrigeration system, comprising: a compressor, an evaporator, a condenser, an economizer and a plurality of regulating valves, wherein the outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the first end of the economizer, and the second end of the economizer is connected to the air supply port of the compressor; the second end of the economizer is connected to the inlet of the compressor through at least one regulating valve, or the second end of the economizer is connected to the inlet of the evaporator through at least one regulating valve; the third end of the economizer is connected to the inlet of the compressor through at least one regulating valve, the fourth end of the economizer is connected to the third end of the economizer through at least one regulating valve, the third end of the economizer is connected to the inlet of the evaporator through at least one regulating valve, and the outlet of the evaporator is connected to the inlet of the compressor.

[0006] Optionally, the regulating valve includes a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve and a fifth regulating valve, the third end of the economizer is connected to the inlet of the evaporator through the first regulating valve, the fourth end of the economizer is connected to the third end of the economizer through the second regulating valve, the third end of the economizer is connected to the inlet of the compressor through the third regulating valve, the second end of the economizer is connected to the inlet of the compressor through the fourth regulating valve, and both ends of the fifth regulating valve are respectively connected to the inlet and outlet of the compressor.

[0007] Optionally, when the refrigeration system is running at full load, the first regulating valve and the second regulating valve are turned on, the fourth regulating valve and the fifth regulating valve are turned off, and the third regulating valve is adjusted according to the outlet temperature of the compressor.

[0008] Optionally, when the refrigeration system operates at partial load, the first regulating valve, the fourth regulating valve and the fifth regulating valve are turned on, the second regulating valve is turned off, and the third regulating valve is adjusted according to the outlet temperature of the compressor.

[0009] Optionally, the regulating valve includes a sixth regulating valve and a seventh regulating valve, the outlet of the compressor is connected to the inlet of the evaporator through the sixth regulating valve, and the second end of the economizer is connected to the inlet of the evaporator through the seventh regulating valve.

[0010] Optionally, when the refrigeration system operates at full load, the sixth regulating valve and the seventh regulating valve are closed.

[0011] Optionally, when the refrigeration system operates at partial load, the sixth regulating valve and the seventh regulating valve are connected.

[0012] Optionally, the refrigeration system further includes a controller, which is electrically connected to the compressor and each regulating valve, and is used to control the working state of the compressor and each regulating valve.

[0013] Optionally, the refrigeration system further includes a temperature sensor, and the temperature sensor is located at the outlet of the compressor.

[0014] In a second aspect, an embodiment of the utility model provides an environmental test chamber, comprising: a refrigeration system as described in the first aspect.

[0015] The refrigeration system and environmental test chamber provided by the embodiments of the utility model include: a compressor, an evaporator, a condenser, an economizer and a plurality of regulating valves, wherein the outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the first end of the economizer, and the second end of the economizer is connected to the air supply port of the compressor; the second end of the economizer is connected to the inlet of the compressor through at least one regulating valve, or the second end of the economizer is connected to the inlet of the evaporator through at least one regulating valve; the third end of the economizer is connected to the inlet of the compressor through at least one regulating valve, the fourth end of the economizer is connected to the third end of the economizer through at least one regulating valve, the third end of the economizer is connected to the inlet of the evaporator through at least one regulating valve, and the outlet of the evaporator is connected to the inlet of the compressor. The refrigeration system and environmental test chamber provided by the embodiments of the utility model replenish air to the compressor through the economizer to improve the refrigeration output, and adjust the refrigeration output by adjusting the opening of the regulating valve between the third end and the fourth end of the economizer. When the refrigeration demand is reduced, the refrigeration capacity is reduced by reducing the opening of the regulating valve between the third end and the fourth end of the economizer. When the regulating valve between the third end and the fourth end of the economizer is in a closed state, if the refrigeration demand is further reduced, the refrigeration output is reduced by adjusting the opening of the regulating valve between the second end of the economizer and the inlet of the compressor, or by adjusting the opening of the regulating valve between the second end of the economizer and the inlet of the evaporator, so as to meet the refrigeration demand and achieve energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural block diagram of a refrigeration system provided by an embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a refrigeration system provided by an embodiment of the utility model;

[0018] Figure 3 It is a structural schematic diagram of a refrigeration system provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0020] Figure 1 This is a structural block diagram of a refrigeration system provided by an embodiment of the utility model. Figure 1The refrigeration system includes: a compressor 10, an evaporator 20, a condenser 30, an economizer 40 and a plurality of regulating valves 50, wherein the outlet P2 of the compressor 10 is connected to the inlet of the condenser 30, the outlet of the condenser 30 is connected to the first end of the economizer 40, and the second end of the economizer 40 is connected to the air supply port P3 of the compressor 10; the second end of the economizer 40 is connected to the inlet P1 of the compressor 10 through at least one regulating valve 50, or the second end of the economizer 40 is connected to the inlet of the evaporator 20 through at least one regulating valve 50; the third end of the economizer 40 is connected to the inlet of the compressor 10 through at least one regulating valve 50, the fourth end of the economizer 40 is connected to the third end of the economizer 40 through at least one regulating valve 50, the third end of the economizer 40 is connected to the inlet of the evaporator 20 through at least one regulating valve 50, and the outlet of the evaporator 20 is connected to the inlet P1 of the compressor 10.

[0021] Specifically, the regulating valve 50 between the second end of the economizer 40 and the inlet of the compressor 10, the regulating valve 50 between the second end of the economizer 40 and the evaporator 20, the regulating valve 50 between the third end of the economizer 40 and the inlet of the compressor 10, the regulating valve 50 between the fourth end of the economizer 40 and the third end of the economizer 40, and the regulating valve 50 between the third end of the economizer 40 and the inlet of the evaporator 20 are all different regulating valves 50. Among them, the second end of the economizer 40 is connected to the inlet of the compressor 10 through at least one regulating valve 50, or the second end of the economizer 40 is connected to the inlet of the evaporator 20 through at least one regulating valve 50. Exemplarily, the second end of the economizer 40 is connected to the inlet of the compressor 10 through one regulating valve 50, or the second end of the economizer 40 is connected to the inlet of the evaporator 20 through another regulating valve 50, so that when the refrigeration capacity demand of the refrigeration system is reduced, the refrigeration capacity is reduced by adjusting the opening of the regulating valve. Furthermore, when the refrigeration system is in different working states, such as full-load operation and partial-load operation, the regulating valve 50 between the third end of the economizer 40 and the inlet of the evaporator 20 is in an on state, and the on-off states of other regulating valves 50 are different. The air supply port P3 of the compressor 10 can supply air to the compressor 10, and can also serve as an intermediate exhaust port to exhaust air from the compressor 10, so as to meet the actual cooling capacity requirement of the refrigeration system.

[0022] It should be noted that the specific number of regulating valves between the above-mentioned components can be determined according to actual refrigeration needs and is not limited here.

[0023] The refrigeration system provided in this embodiment includes: a compressor, an evaporator, a condenser, an economizer and a plurality of regulating valves, wherein the outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the first end of the economizer, and the second end of the economizer is connected to the air supply port of the compressor; the second end of the economizer is connected to the inlet of the compressor through at least one regulating valve, or the second end of the economizer is connected to the inlet of the evaporator through at least one regulating valve; the third end of the economizer is connected to the inlet of the compressor through at least one regulating valve, the fourth end of the economizer is connected to the third end of the economizer through at least one regulating valve, the third end of the economizer is connected to the inlet of the evaporator through at least one regulating valve, and the outlet of the evaporator is connected to the inlet of the compressor. The refrigeration system provided in this embodiment replenishes air to the compressor through the economizer to improve the refrigeration output, and adjusts the refrigeration output by adjusting the opening of the regulating valve between the third end and the fourth end of the economizer. When the refrigeration demand decreases, the refrigeration capacity is reduced by reducing the opening of the regulating valve between the third end and the fourth end of the economizer. When the regulating valve between the third end and the fourth end of the economizer is in a closed state, if the refrigeration demand is further reduced, the refrigeration output is reduced by adjusting the opening of the regulating valve between the second end of the economizer and the inlet of the compressor, or by adjusting the opening of the regulating valve between the second end of the economizer and the inlet of the evaporator, so as to meet the refrigeration demand and achieve energy saving.

[0024] Figure 2 This is a schematic diagram of the structure of a refrigeration system provided by an embodiment of the utility model. Figure 2 Optionally, the regulating valve 50 includes a first regulating valve 51, a second regulating valve 52, a third regulating valve 53, a fourth regulating valve 54 and a fifth regulating valve 55. The third end of the economizer 40 is connected to the inlet of the evaporator 20 through the first regulating valve 51, the fourth end of the economizer 40 is connected to the third end of the economizer 40 through the second regulating valve 52, the third end of the economizer 40 is connected to the inlet of the compressor 10 through the third regulating valve 53, the second end of the economizer 40 is connected to the inlet of the compressor 10 through the fourth regulating valve 54, and the two ends of the fifth regulating valve 55 are respectively connected to the inlet and outlet of the compressor 10. Each regulating valve is used to control the flow of its own pipeline to meet the actual cooling capacity demand of the refrigeration system.

[0025] Optionally, when the refrigeration system is running at full load, the first regulating valve 51 and the second regulating valve 52 are turned on, the fourth regulating valve 54 and the fifth regulating valve 55 are turned off, and the third regulating valve 53 is adjusted according to the outlet temperature of the compressor 10 .

[0026] Specifically, when the refrigeration system is running at full load, such as when the refrigeration system raises and lowers the temperature of the high and low temperature boxes of the environmental test box, the required refrigeration capacity is large, the refrigerant evaporates through the evaporator 20 to absorb heat and then becomes low-pressure steam, enters the compressor 10 through the inlet of the compressor 10 for compression, and the compressed high-temperature and high-pressure gaseous refrigerant enters the condenser 30 for condensation to become high-temperature and high-pressure liquid refrigerant, and then passes through the economizer 40, it is divided into two paths, the first path: the second regulating valve 52 bypasses a part of the refrigerant to throttle and cool down to absorb the heat of the main refrigerant, and becomes a gaseous refrigerant under intermediate pressure and enters the middle of the compressor 10 through the air supply port of the compressor 10 for compression, and the second path: the main refrigerant of the economizer 40 discharges heat to the above-mentioned first refrigerant to cool down, and then throttles through the first regulating valve 51 to become a low-temperature and low-pressure two-phase flow refrigerant to enter the evaporator 20 for heat evaporation, thereby generating refrigeration capacity. In this cycle, the fourth regulating valve 54 and the fifth regulating valve 55 are shut off and closed, and the third regulating valve 53 is adjusted according to the exhaust temperature, that is, the outlet temperature of the compressor 10.

[0027] Optionally, when the refrigeration system is operated at partial load, the first regulating valve 51, the fourth regulating valve 54 and the fifth regulating valve 55 are turned on, the second regulating valve 52 is turned off, and the third regulating valve 53 is adjusted according to the outlet temperature of the compressor.

[0028] Specifically, when the refrigeration system is running at partial load, in order to achieve a smaller cooling capacity output demand and reduce the power consumption of the compressor as much as possible, the refrigerant flow direction is basically the same as that of full load, with the following differences: the second regulating valve 52 will gradually close as the cooling capacity demand decreases, and finally completely close. When the second regulating valve 52 is completely closed, if the cooling capacity demand further decreases, the fourth regulating valve 54 is opened at this time. When the fourth regulating valve 54 is at the maximum opening or continues to open, its cooling capacity cannot be further reduced. At this time, the fifth regulating valve 55 is gradually opened to further reduce the cooling capacity output. After the fourth regulating valve 54 and the fifth regulating valve 55 are opened, the cooling capacity output of the compressor will be reduced. The principle is that the cooling capacity has a positive correlation trend with the liquid refrigerant flow rate flowing through the evaporator 20, that is, the liquid refrigerant flow rate flowing through the evaporator 20 increases, and the cooling capacity increases, and vice versa. After the fourth regulating valve 54 and the fifth regulating valve 55 are opened, the liquid refrigerant flow entering the evaporator 20 will decrease, that is, the cooling capacity output is reduced. The difference is that the refrigerant flowing through the fifth regulating valve 55 is fully compressed by the compressor 10, that is, compressed from the inlet P1 of the compressor 10 to the outlet P2 of the compressor 10, while the refrigerant flowing through the fourth regulating valve 54 is only partially compressed, that is, compressed from the inlet P1 of the compressor 10 to the air supply port P3 of the compressor 10.

[0029] Figure 3 This is a schematic diagram of the structure of a refrigeration system provided by an embodiment of the utility model. Figure 3Optionally, the regulating valve includes a sixth regulating valve 56 and a seventh regulating valve 57 , the outlet of the compressor 10 is connected to the inlet of the evaporator 20 through the sixth regulating valve 56 , and the second end of the economizer 40 is connected to the inlet of the evaporator 20 through the seventh regulating valve 57 .

[0030] The regulating valves in the refrigeration system include a first regulating valve 51, a second regulating valve 52, a third regulating valve 53, a sixth regulating valve 56 and a seventh regulating valve 57. Figure 2 The first regulating valve 51 and Figure 3 The position of the first regulating valve 51 in is the same as that in Figure 2 The second regulating valve 52 and Figure 3 The position of the second regulating valve 52 is the same. Figure 2 The third regulating valve 53 and Figure 3 The position of the third regulating valve 53 is the same.

[0031] Optionally, when the refrigeration system is running at full load, the sixth regulating valve 56 and the seventh regulating valve 57 are closed.

[0032] Specifically, when the refrigeration system is running at full load, the first regulating valve 51 and the second regulating valve 52 are turned on, and the sixth regulating valve 56 and the seventh regulating valve 57 are turned off. For example, when the refrigeration system raises and lowers the temperature of the high and low temperature box of the environmental test box, the required refrigeration capacity is large, and the refrigerant absorbs heat through the evaporator 20 and then becomes low-pressure steam, enters the compressor 10 through the inlet of the compressor 10 for compression, and the compressed high-temperature and high-pressure gaseous refrigerant enters the condenser 30 for condensation to become high-temperature and high-pressure liquid refrigerant, and then passes through the economizer 40, it is divided into two paths, the first path: bypassing a part of the refrigerant by the second regulating valve 52 for throttling and cooling to absorb the heat of the main refrigerant, and becomes a gaseous refrigerant under intermediate pressure, and enters the middle of the compressor 10 through the air supply port of the compressor 10 for compression, and the second path: the main refrigerant of the economizer 40 discharges heat to the above-mentioned first refrigerant to cool down, and then throttles through the first regulating valve 51 to become a low-temperature and low-pressure two-phase flow refrigerant to enter the evaporator 20 for heat evaporation, thereby generating refrigeration capacity. During this cycle, the sixth regulating valve 56 and the seventh regulating valve 57 are in a closed state, and the third regulating valve 53 is adjusted according to the exhaust gas temperature, that is, the outlet temperature of the compressor 10 .

[0033] Optionally, when the refrigeration system operates at partial load, the sixth regulating valve 56 and the seventh regulating valve 57 are connected.

[0034] Specifically, when the refrigeration system is running at partial load, the first regulating valve 51, the sixth regulating valve 56 and the seventh regulating valve 57 are turned on, the second regulating valve 52 is turned off, and the third regulating valve 53 is adjusted according to the outlet temperature of the compressor. In order to achieve a smaller cooling capacity output demand and reduce the power consumption of the compressor as much as possible, the refrigerant flow direction is basically the same as the full load, and the difference is as follows: the second regulating valve 52 is gradually closed as the cooling capacity demand decreases, and finally completely closed. When the second regulating valve 52 is completely closed, if the cooling capacity demand is further reduced, the seventh regulating valve 57 is opened at this time. When the seventh regulating valve 57 is at the maximum opening or continues to be opened, its cooling capacity cannot be further reduced. At this time, the sixth regulating valve 56 is gradually opened to further reduce the cooling capacity output. After the sixth regulating valve 56 and the seventh regulating valve 57 are opened, the cooling capacity output of the compressor will be reduced. The principle is that the cooling capacity has a positive correlation trend with the liquid refrigerant flow rate flowing through the evaporator 20, that is, the liquid refrigerant flow rate flowing through the evaporator 20 increases, and its cooling capacity increases, and vice versa. After the sixth regulating valve 56 and the seventh regulating valve 57 are opened, the flow rate of the liquid refrigerant entering the evaporator 20 will become smaller, that is, the cooling capacity output will be reduced. The difference is that the refrigerant flowing through the sixth regulating valve 56 is fully compressed by the compressor, that is, compressed from P1 to P2, while the refrigerant flowing through the seventh regulating valve 57 is only partially compressed, that is, compressed from the inlet P1 of the compressor 10 to the air supply port P3 of the compressor 10 (at this time, the air supply port P3 of the compressor 10 serves as an intermediate exhaust port to exhaust) and then enters the inlet of the evaporator 20. The refrigerant flowing through the sixth regulating valve 56 and the refrigerant flowing through the seventh regulating valve 57 both enter the inlet of the evaporator 20, and can also return to the outlet of the evaporator 20 in actual implementation, or can enter the inlet of the evaporator 20 all the way and the outlet of the evaporator 20 all the way according to different design considerations.

[0035] Optionally, the refrigeration system further includes a controller (not shown in the figure), which is electrically connected to the compressor and each regulating valve, and is used to control the working state of the compressor and each regulating valve. Specifically, the on-off state of each regulating valve is controlled by the controller, such as the controller receives a control instruction and controls the on-off state and opening size of each regulating valve according to the control instruction to meet the actual cooling capacity demand of the refrigeration system.

[0036] Optionally, the refrigeration system further includes a temperature sensor, which is located at the outlet of the compressor. The temperature sensor is electrically connected to the controller, and the temperature collected by the temperature sensor is transmitted to the controller, so that the controller controls the on / off state and opening size of the third regulating valve 53 according to the temperature.

[0037] It should be noted that the opening size of each of the above-mentioned regulating valves can be determined according to actual control requirements and is not limited here.

[0038] The refrigeration system provided in this embodiment replenishes air to the compressor through an economizer to increase the cooling capacity output, and adjusts the cooling capacity output by adjusting the opening of the second regulating valve. When the cooling capacity demand decreases, the second regulating valve is controlled to be closed, and the opening of the fourth regulating valve is adjusted, or the opening of the seventh regulating valve is adjusted. When the cooling capacity demand further decreases, the opening of the fifth regulating valve is adjusted, or the opening of the sixth regulating valve is adjusted to reduce the cooling capacity output to meet the cooling capacity demand and achieve energy saving; and the gas compressed at the air supply port of the compressor returns to the inlet of the compressor through the fourth regulating valve for cooling capacity output regulation. Compared with the traditional method of bypassing the cooling capacity output from the outlet of the compressor to the inlet of the compressor, the compression of another part of the bypassed refrigerant is reduced, that is, the power consumption of the compression from the air supply port to the outlet is saved.

[0039] This embodiment also provides an environmental test box, including: a refrigeration system as described in any embodiment of the utility model. Therefore, the environmental test box provided in this embodiment and the refrigeration system provided in any embodiment of the utility model belong to the same utility model concept, have corresponding beneficial effects, and the technical details not detailed in this embodiment are detailed in the refrigeration system provided in any embodiment of the utility model.

[0040] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A refrigeration system, characterized in that: include: A compressor, an evaporator, a condenser, an economizer and a plurality of regulating valves, wherein the outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the first end of the economizer, and the second end of the economizer is connected to the air supply port of the compressor; the second end of the economizer is connected to the inlet of the compressor through at least one regulating valve, or the second end of the economizer is connected to the inlet of the evaporator through at least one regulating valve; the third end of the economizer is connected to the inlet of the compressor through at least one regulating valve, the fourth end of the economizer is connected to the third end of the economizer through at least one regulating valve, the third end of the economizer is connected to the inlet of the evaporator through at least one regulating valve, and the outlet of the evaporator is connected to the inlet of the compressor.

2. The refrigeration system according to claim 1, characterized in that: The regulating valve includes a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve and a fifth regulating valve. The third end of the economizer is connected to the inlet of the evaporator through the first regulating valve, the fourth end of the economizer is connected to the third end of the economizer through the second regulating valve, the third end of the economizer is connected to the inlet of the compressor through the third regulating valve, the second end of the economizer is connected to the inlet of the compressor through the fourth regulating valve, and the two ends of the fifth regulating valve are connected to the inlet and outlet of the compressor respectively.

3. The refrigeration system according to claim 2, characterized in that: When the refrigeration system is running at full load, the first regulating valve and the second regulating valve are turned on, the fourth regulating valve and the fifth regulating valve are turned off, and the third regulating valve is adjusted according to the outlet temperature of the compressor.

4. The refrigeration system according to claim 2, characterized in that: When the refrigeration system operates at partial load, the first regulating valve, the fourth regulating valve and the fifth regulating valve are turned on, the second regulating valve is turned off, and the third regulating valve is adjusted according to the outlet temperature of the compressor.

5. The refrigeration system according to claim 1, characterized in that: The regulating valve includes a sixth regulating valve and a seventh regulating valve, the outlet of the compressor is communicated with the inlet of the evaporator through the sixth regulating valve, and the second end of the economizer is communicated with the inlet of the evaporator through the seventh regulating valve.

6. The refrigeration system according to claim 5, characterized in that: When the refrigeration system operates at full load, the sixth regulating valve and the seventh regulating valve are closed.

7. The refrigeration system according to claim 5, characterized in that: When the refrigeration system operates at partial load, the sixth regulating valve and the seventh regulating valve are connected.

8. The refrigeration system according to claim 1, characterized in that: It also includes a controller, which is electrically connected to the compressor and each regulating valve, and is used to control the working state of the compressor and each regulating valve.

9. The refrigeration system according to claim 1, characterized in that: A temperature sensor is also included, and the temperature sensor is located at the outlet of the compressor.

10. An environmental test chamber, characterized in that: include: A refrigeration system as claimed in any one of claims 1 to 9.

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