Cold and hot impact test box

Abstract

The invention discloses a cold and hot impact test box, and relates to the technical field of test equipment, the cold and hot impact test box comprises a box body, at least one heat exchange device, a first protection device and a regulation and control device, a high temperature test cavity and a low temperature test cavity are formed in the box body, and the high temperature test cavity and the low temperature test cavity are arranged separately; at least one heat exchange device is connected with the high-temperature test cavity or the low-temperature test cavity and is used for heating the high-temperature test cavity or cooling the low-temperature test cavity; the heat exchange equipment comprises a first compressor; the first protection device comprises a cooling pipeline and an air pump, the cooling pipeline is communicated with the low-temperature test cavity and a first inlet of the at least one first compressor, and the air pump is used for guiding cold air of the low-temperature test cavity to enter the at least one first compressor from the cooling pipeline. The invention aims to improve the safety performance of the cold and hot impact test box and prolong the service life of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, in particular to a thermal shock testing box. Background Art

[0002] A thermal shock chamber is a device used to simulate the performance and reliability of products in rapidly fluctuating temperature environments. It assesses a product's adaptability and resistance to these temperature fluctuations by exposing it to extreme low and high temperatures in short bursts. This type of testing is crucial for product development and quality control in fields such as electronic equipment, automotive components, and aerospace components.

[0003] Traditional thermal shock test chambers typically consist of a single enclosure, clearly divided into a high-temperature test chamber and a low-temperature test chamber. Material containers move back and forth between the two chambers to facilitate the placement of test materials. The refrigeration unit, a core component comprising a compressor, condenser, and evaporator, is responsible for rapidly reducing the temperature. A heating unit is also essential to create a high-temperature environment.

[0004] However, when the existing thermal shock test chamber is faced with insufficient refrigerant or the compressor is blocked by impurities, the compressor is easily damaged due to overheating. Summary of the Invention

[0005] The main purpose of the present invention is to provide a thermal shock test chamber, aiming to improve the safety performance of the thermal shock test chamber and the service life of the compressor.

[0006] To achieve the above objectives, the present invention proposes a thermal shock test chamber comprising:

[0007] A box body, wherein a high-temperature test chamber and a low-temperature test chamber are formed in the box body;

[0008] At least one heat exchange device, at least one of the heat exchange devices is connected to the high-temperature test chamber or the low-temperature test chamber, and is used to heat the high-temperature test chamber or to cool the low-temperature test chamber; the heat exchange device includes a first compressor;

[0009] a first protection device, the first protection device comprising a cooling pipe and an air pump, the cooling pipe communicating with the low-temperature test chamber and a first inlet of at least one of the first compressors, the air pump being configured to guide cold air from the low-temperature test chamber through the cooling pipe into the at least one of the first compressors; and

[0010] The control device includes a first temperature sensor and a controller, wherein the first temperature sensor is used to measure the temperature of at least one of the first compressors and output a temperature signal, and the controller is electrically connected to the first temperature sensor and the air pump, and is used to receive the temperature signal and control the start or stop of the air pump according to the temperature signal.

[0011] In one embodiment, at least one of the heat exchange devices is a refrigeration device, which further includes a regenerator, a condenser, an evaporator and an expansion valve; in the refrigeration device, the outlet of the first compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the high-pressure side inlet of the regenerator, the high-pressure side outlet of the regenerator is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the inlet of the evaporator, the first outlet of the evaporator is connected to the low-pressure side inlet of the regenerator, the low-pressure side outlet of the regenerator is connected to the second inlet of the first compressor, and the outlet of the evaporator is connected to the low-pressure test chamber.

[0012] In one embodiment, the thermal shock test chamber further includes a second protection device, which includes a pressure relief pipe, a first pressure relief valve, and a cooling box. The inlet of the first pressure relief valve is connected to the outlet of the condenser, and the outlet of the first pressure relief valve is connected to the pressure relief pipe. The cooling box is connected to the pressure relief pipe and the low-pressure side outlet of the regenerator.

[0013] In one embodiment, the refrigeration device includes a high-pressure pipeline, wherein the inlet and outlet of the high-pressure pipeline are connected to the outlet of the condenser and the high-pressure side inlet of the regenerator respectively;

[0014] The second protection device further includes a second temperature sensor, the probe of the second temperature sensor extending into the high-pressure pipeline for measuring the temperature inside the high-pressure pipeline;

[0015] The controller is electrically connected to the second temperature sensor and the first pressure relief valve. The controller is further configured to receive the second temperature signal and regulate the opening and closing of the first pressure relief valve.

[0016] In one embodiment, the first pressure relief valve is a three-way solenoid valve, the inlet of the three-way solenoid valve is connected to the outlet of the condenser, the first outlet of the three-way solenoid valve is connected to the inlet of the high-pressure pipeline, and the second outlet of the three-way solenoid valve is connected to the high-pressure pipeline.

[0017] In one embodiment, a first air inlet cavity and a second air inlet cavity are formed inside the cooling box, and the second air inlet cavity is arranged around the first air inlet cavity; the first air inlet cavity is connected to the pressure relief pipe and the low-pressure side outlet of the regenerator; the second air inlet cavity is connected to the low-temperature test cavity and the outside world.

[0018] In one embodiment, the cross-sectional area of the second air inlet cavity is gradually reduced along the flow direction in the second air inlet cavity.

[0019] In one embodiment, the thermal shock test chamber further includes a second compressor, an outlet of the second compressor is connected to the inlet of the condenser, and a low-pressure side outlet of the regenerator is connected to the inlet of the second compressor.

[0020] In one embodiment, the first compressor is provided with a second pressure relief valve.

[0021] In one embodiment, the first protection device further includes a gas-liquid separator, and the gas-liquid separator is provided in the cooling pipe.

[0022] The hot and cold shock test chamber provided by the present application connects the low-temperature test chamber with the first compressor by setting up a cooling pipe, thereby constructing an efficient cooling circuit. Through this design, the cold air in the low-temperature test chamber can be directly introduced into the first compressor under the guidance of the air pump, thereby achieving effective cooling of the inside of the first compressor, thereby eliminating the risk of overheating. In addition, the hot and cold shock test chamber is also equipped with a first temperature sensor and a controller. The two work together to monitor the temperature of the first compressor in real time and automatically adjust the operation of the air pump to ensure that the first compressor is always maintained within a safe and stable temperature range. This application not only significantly improves the safety performance of the equipment and greatly extends the service life of the first compressor, but also further enhances the overall stability and test accuracy of the equipment, providing a more reliable and efficient solution for hot and cold shock tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 A schematic structural diagram of a thermal shock test chamber provided in one embodiment of the present invention;

[0025] Figure 2 A cross-sectional view of a thermal shock test chamber provided in one embodiment of the present invention;

[0026] Figure 3 A schematic structural diagram of a heat exchange device provided in one embodiment of the present invention;

[0027] Figure 4A schematic structural diagram of a heat exchange device provided in another embodiment of the present invention.

[0028] Description of Figure Numbers:

[0029] 100. Thermal shock test chamber; 1. Chamber; 11. High-temperature test chamber; 12. Low-temperature test chamber; 2. Heat exchange equipment; 21. First compressor; 22. Condenser; 23. Regenerator; 24. Expansion valve; 25. Evaporator; 26. High-pressure pipeline; 3. First protection device; 31. Cooling pipeline; 32. Air pump; 33. Gas-liquid separator; 4. Second protection device; 41. Pressure relief pipeline; 42. First pressure relief valve; 42a. Three-way solenoid valve.

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The present application provides a thermal shock test chamber 100 .

[0035] See also Figures 1 to 4In one embodiment of the present application, the thermal shock test chamber 100 includes a chamber 1, at least one heat exchange device 2, a first protection device 3, and a control device. A high-temperature test chamber 11 and a low-temperature test chamber 12 are formed in the chamber 1. The at least one heat exchange device 2 is connected to the high-temperature test chamber 11 or the low-temperature test chamber 12 for heating the high-temperature test chamber 11 or cooling the low-temperature test chamber 12. The heat exchange device 2 includes a first compressor 21. The first protection device 3 includes a cooling pipe 31 and an air pump 32. The cooling pipe 31 connects the low-temperature test chamber 12 and a first inlet of the at least one first compressor 21. The air pump 32 is used to guide cold air from the low-temperature test chamber 12 into the at least one first compressor 21 through the cooling pipe 31. The control device includes a first temperature sensor and a controller. The first temperature sensor is used to measure the temperature of the at least one first compressor 21 and output a temperature signal. The controller is electrically connected to the first temperature sensor and the air pump 32 for receiving the temperature signal and controlling the start or stop of the air pump 32 according to the temperature signal.

[0036] The hot and cold shock test chamber 100 provided in the present application connects the low-temperature test chamber 12 with the first compressor 21 by setting a cooling pipe 31, thereby constructing an efficient cooling circuit. Through this design, the cold air in the low-temperature test chamber 12 can be directly introduced into the first compressor 21 under the guidance of the air pump 32, thereby achieving effective cooling of the interior of the first compressor 21, thereby eliminating the risk of overheating. In addition, the hot and cold shock test chamber 100 is also equipped with a first temperature sensor and a controller, which work together to monitor the temperature of the first compressor 21 in real time and automatically adjust the operation of the air pump 32 to ensure that the first compressor 21 is always maintained within a safe and stable temperature range. The present application not only significantly improves the safety performance of the equipment and greatly extends the service life of the first compressor 21, but also further enhances the overall stability and test accuracy of the equipment, providing a more reliable and efficient solution for hot and cold shock tests.

[0037] It is understood that the core function of the thermal shock test chamber 100 is to rapidly switch between high and low temperature environments to simulate extreme climate conditions, and the heat exchange device 2 is a key component for achieving this function, responsible for regulating the temperature within the high-temperature test chamber 11 and the low-temperature test chamber 12 by cooling or heating. In various embodiments of the present application, the configuration of the heat exchange device 2 is flexible. For example, in one embodiment of the present application, to simplify the system structure and reduce costs, only one heat exchange device 2 can be provided, which can perform both cooling and heating functions to achieve rapid temperature adjustment. Alternatively, in another embodiment of the present application, to improve the accuracy and speed of temperature adjustment, two heat exchange devices 2 can be provided, each dedicated to cooling and heating, corresponding to the high-temperature test chamber 11 and the low-temperature test chamber 12, respectively, to achieve more professional and efficient temperature control. Alternatively, in other embodiments of the present application, to enhance the reliability and continuous operation capability of the equipment, three or more heat exchange devices 2 can be provided as a redundant design. When one device fails, the other device can immediately take over the work to ensure the continuous progress of the test. Based on the above-mentioned multiple configuration methods, the design of the first protection device 3 is also correspondingly flexible. It can be used specifically to protect a single heat exchange device 2, or its protection range can be expanded to cover multiple or all heat exchange devices 2 to ensure the safe and stable operation of the entire system.

[0038] See also Figure 3 In order to further illustrate the present invention, the following will be described in detail using a refrigeration device in the heat exchange device 2 as a specific example. In one embodiment, at least one heat exchange device 2 is a refrigeration device, and the refrigeration device further includes a regenerator 23, a condenser 22, an evaporator 25 and an expansion valve 24; in the refrigeration device, the outlet of the first compressor 21 is connected to the inlet of the condenser 22, the outlet of the condenser 22 is connected to the high-pressure side inlet of the regenerator 23, the high-pressure side outlet of the regenerator 23 is connected to the inlet of the expansion valve 24, the outlet of the expansion valve 24 is connected to the inlet of the evaporator 25, the first outlet of the evaporator 25 is connected to the low-pressure side inlet of the regenerator 23, the low-pressure side outlet of the regenerator 23 is connected to the second inlet of the first compressor 21, and the second outlet of the evaporator 25 is connected to the low-temperature test chamber 12.

[0039] In this embodiment, the first compressor 21 compresses the refrigerant and delivers it to the condenser 22. The refrigerant releases heat and cools in the condenser 22. It then undergoes further heat exchange through the high-pressure side of the regenerator 23, raising the refrigerant temperature before entering the evaporator 25. This ensures efficient evaporation of the refrigerant after the expansion valve 24. The evaporator 25 absorbs heat from the low-temperature test chamber 12, rapidly cooling it. The low-pressure side of the regenerator 23 recovers heat from the low-temperature refrigerant at the evaporator 25 outlet to preheat the refrigerant entering the first compressor 21, reducing the power consumption of the first compressor 21. This cyclic operation not only achieves efficient energy utilization and reduces energy loss, but also precisely and stably controls the temperature within the low-temperature test chamber 12 by precisely controlling the refrigerant flow rate and pressure. Furthermore, the provision of the regenerator 23 effectively balances pressure and temperature fluctuations within the system, enhancing operational stability, preventing overheating of the first compressor 21, and extending the equipment's service life. The modular design also makes the equipment easy to expand or modify to accommodate test chambers of varying specifications. Multiple units can be connected in parallel or in series, improving testing efficiency.

[0040] See also Figure 4 In one embodiment, the thermal shock test chamber 100 further includes a second protection device 4, which includes a pressure relief pipe 41, a first pressure relief valve 42, and a cooling box 43. The inlet of the first pressure relief valve 42 is connected to the outlet of the condenser 22, and the outlet of the first pressure relief valve 42 is connected to the pressure relief pipe 41. The cooling box 43 is connected to the pressure relief pipe 41 and the low-pressure side outlet of the regenerator 23.

[0041] In this embodiment, the safety and stability of the thermal shock test chamber 100 are significantly improved by adding a second protection device 4, including a pressure relief pipe 41, a first pressure relief valve 42 and a cooling box 43. Specifically, when the system pressure exceeds the preset safety threshold, the first pressure relief valve 42 automatically opens, and the high-temperature and high-pressure refrigerant at the outlet of the condenser 22 is guided to the cooling box 43 through the pressure relief pipe 41. The cooling box 43 effectively cools and reduces the pressure of this part of the high-temperature and high-pressure gas, avoiding equipment damage or safety hazards caused by excessive pressure. At the same time, the cooled refrigerant returns to the system through the low-pressure side outlet of the regenerator 23, which not only realizes the recovery and utilization of heat, but also reduces the power consumption and heat load of the first compressor 21. This design not only ensures the safe operation of the equipment under extreme working conditions, but also optimizes energy utilization efficiency, reduces energy waste, and extends the service life of the equipment, providing more reliable and efficient environmental simulation conditions for thermal shock tests.

[0042] In one embodiment, the refrigeration device includes a high-pressure pipe 26, the inlet and outlet of the high-pressure pipe 26 are respectively connected to the outlet of the condenser 22 and the high-pressure side inlet of the regenerator 23; the second protection device 4 also includes a second temperature sensor, the probe of the second temperature sensor extends into the high-pressure pipe 26, and is used to measure the temperature in the high-pressure pipe 26 and output a second temperature signal; the controller is electrically connected to the second temperature sensor and the first pressure relief valve 42, and the controller is also used to receive the second temperature signal and regulate the opening and closing of the first pressure relief valve 42.

[0043] In this embodiment, a high-pressure pipe 26 is installed in the refrigeration unit, with its inlet and outlet connected to the outlet of the condenser 22 and the high-pressure inlet of the regenerator 23, respectively, ensuring smooth refrigerant flow and efficient heat exchange. Simultaneously, a second temperature sensor probe in the second protection device 4 extends into the high-pressure pipe 26, measuring and outputting the pipe's internal temperature signal in real time. This allows the controller to accurately receive and regulate the opening and closing of the first pressure relief valve 42 accordingly, achieving precise temperature monitoring and intelligent pressure relief control within the high-pressure pipe 26. When the temperature exceeds a safety threshold, the controller automatically commands the pressure relief valve to open, promptly releasing excess pressure and preventing equipment damage or safety accidents, significantly improving the safety and stability of the system.

[0044] Please continue reading Figure 4 In one embodiment, the first pressure relief valve 42 is a three-way solenoid valve 42a, the inlet of the three-way solenoid valve 42a is connected to the outlet of the condenser 22, the first outlet of the three-way solenoid valve 42a is connected to the inlet of the high-pressure pipeline 26, and the second outlet of the three-way solenoid valve 42a is connected to the high-pressure pipeline 26.

[0045] In this embodiment, when the system detects that the pressure within the high-pressure pipeline 26 exceeds a preset safety threshold, the three-way solenoid valve 42a responds quickly, directing the excess pressure to a safe area, effectively preventing equipment damage or safety accidents caused by excessive pressure. Furthermore, the design of the three-way solenoid valve 42a simplifies the piping layout, reduces system complexity, and improves the maintainability and service life of the equipment. This layout also optimizes the refrigeration cycle, reduces energy loss, and improves the system's energy efficiency, providing more stable and efficient environmental simulation conditions for thermal shock testing.

[0046] In one embodiment, a first air inlet cavity and a second air inlet cavity are formed inside the cooling box 43, and the second air inlet cavity is arranged around the first air inlet cavity; the first air inlet cavity is connected to the pressure relief pipe 41 and the low-pressure side outlet of the regenerator 23; the second air inlet cavity is connected to the low-temperature test cavity 12 and the outside world.

[0047] In this embodiment, the second air inlet cavity surrounds the first air inlet cavity. This design means that within the cooling box 43, the second air inlet cavity surrounds the first air inlet cavity in a circumferential manner. For example, the first air inlet cavity is located in the center or inner position, while the second air inlet cavity surrounds the outside of the first air inlet cavity, forming a "hugging" or "encircling" structure. In this way, the first air inlet cavity can quickly receive and centrally cool the high-temperature, high-pressure gas released from the high-pressure pipeline 26, while the second air inlet cavity connects the low-temperature test chamber 12 with the outside world. This ensures that the cold air in the low-temperature test chamber 12 can quickly cool the high-temperature gas in the first air inlet cavity.

[0048] In one embodiment, the cross-sectional area of the second air inlet cavity is configured to gradually decrease along the flow direction within the second air inlet cavity. It is understood that the cross-sectional area of the second air inlet cavity gradually decreases from the inlet to the outlet, forming a gradual or convergent structure. According to the principles of fluid dynamics, the cold air is accelerated when passing through the second air inlet cavity, thereby enhancing the cooling effect on the high-temperature air in the first air inlet cavity.

[0049] In one embodiment, the thermal shock test chamber 100 further includes a second compressor, the outlet of the second compressor is connected to the inlet of the condenser 22 , and the low-pressure side outlet of the regenerator 23 is connected to the inlet of the second compressor.

[0050] In this embodiment, the first compressor 21 and the second compressor are arranged in parallel. In this way, the two compressors can operate independently without interfering with each other. When a larger cooling capacity is required, the two compressors can work simultaneously to jointly provide cooling capacity for the system. When the temperature of the first compressor 21 is too high due to long-term operation or other reasons, the effect of the first protection device 3 is limited. In order to prevent damage, the operation of the first compressor 21 can be temporarily stopped, and the second compressor can be immediately started to take over the cooling task of the first compressor 21, ensuring the temperature stability in the test chamber and the continuous progress of the test. The parallel design provides a redundancy mechanism. Even if one compressor fails or requires maintenance, the other compressor can ensure the normal operation of the system.

[0051] In one embodiment, a second pressure relief valve is provided on the first compressor 21. It is understood that the second pressure relief valve can serve as a safety valve for the first compressor 21. When the internal pressure of the first compressor 21 rises above a preset safety threshold during operation due to various reasons (such as excessive refrigerant charge, system blockage, excessive external temperature, etc.), the second pressure relief valve automatically opens to release excess pressure, thereby preventing damage to the compressor or danger from overpressure. By timely releasing pressure, the second pressure relief valve helps maintain the stable operation of the first compressor 21 and prevents excessive pressure fluctuations from affecting the performance of the entire refrigeration system.

[0052] If liquid refrigerant enters the compressor, it may cause a "liquid hammer" phenomenon, causing serious damage to the compressor's piston, valve plate, and other components. Therefore, in one embodiment, the first protection device 3 also includes a gas-liquid separator 33, which is arranged in the cooling pipe 31. The addition of the gas-liquid separator 33 can separate the cold air and water in the cooling pipe 31, so that the cold air does not carry any liquid substances after entering the first compressor 21. This allows the first protection device 3 to protect the compressor from damage caused by abnormal pressure while also effectively preventing potential dangers such as liquid hammer, greatly enhancing the safety of the entire system.

[0053] Of course, in other embodiments of the present application, the heat exchange device 2 can also be a heating device. The specific structure of the heating device can refer to the existing technology or directly utilize the structure provided in this application. For example, the heating device also includes a first compressor 21, a regenerator 23, a condenser 22, an evaporator 25, and an expansion valve 24. The outlet of the first compressor 21 is connected to the inlet of the evaporator 25, the outlet of the evaporator 25 is connected to the high-pressure side inlet of the regenerator 23, the high-pressure side outlet of the regenerator 23 is connected to the inlet of the condenser 22, the outlet of the condenser 22 is connected to the inlet of the expansion valve 24, the outlet of the expansion valve 24 is connected to the low-pressure side inlet of the regenerator 23, the low-pressure side outlet of the regenerator 23 is connected to the second inlet of the first compressor 21, and the outlet of the evaporator 25 is connected to the high-temperature test chamber 11. In this way, the outlet of the evaporator 25 is directly connected to the high-temperature test chamber 11, providing a stable and reliable high-temperature environment for testing, ensuring the accuracy and consistency of the test. When the first compressor 21 overheats, the solution used in the refrigeration device can also be used to ensure that the compressor operates within a safe temperature range.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A thermal shock test chamber, characterized in that: include: A box body, wherein a high-temperature test chamber and a low-temperature test chamber are formed in the box body; At least one heat exchange device, at least one of the heat exchange devices is connected to the high-temperature test chamber or the low-temperature test chamber, and is used to heat the high-temperature test chamber or to cool the low-temperature test chamber; the heat exchange device includes a first compressor; a first protection device, the first protection device comprising a cooling pipe and an air pump, the cooling pipe communicating with the low-temperature test chamber and a first inlet of at least one of the first compressors, the air pump being configured to guide cold air from the low-temperature test chamber through the cooling pipe into the at least one of the first compressors; as well as The control device includes a first temperature sensor and a controller, wherein the first temperature sensor is used to measure the temperature of at least one of the first compressors and output a temperature signal, and the controller is electrically connected to the first temperature sensor and the air pump, and is used to receive the temperature signal and control the start or stop of the air pump according to the temperature signal.

2. The thermal shock test chamber according to claim 1, characterized in that: At least one of the heat exchange devices is a refrigeration device, which also includes a regenerator, a condenser, an evaporator and an expansion valve; in the refrigeration device, the outlet of the first compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the high-pressure side inlet of the regenerator, the high-pressure side outlet of the regenerator is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the inlet of the evaporator, the first outlet of the evaporator is connected to the low-pressure side inlet of the regenerator, the low-pressure side outlet of the regenerator is connected to the second inlet of the first compressor, and the second outlet of the evaporator is connected to the low-pressure test chamber.

3. The thermal shock test chamber according to claim 2, characterized in that: The thermal shock test chamber also includes a second protection device, which includes a pressure relief pipe, a first pressure relief valve and a cooling box. The inlet of the first pressure relief valve is connected to the outlet of the condenser, and the outlet of the first pressure relief valve is connected to the pressure relief pipe. The cooling box is connected to the pressure relief pipe and the low-pressure side outlet of the regenerator.

4. The thermal shock test chamber according to claim 3, wherein: The refrigeration device includes a high-pressure pipeline, the inlet and outlet of the high-pressure pipeline are respectively connected to the outlet of the condenser and the high-pressure side inlet of the regenerator; The second protection device further includes a second temperature sensor, the probe of the second temperature sensor extending into the high-pressure pipeline for measuring the temperature inside the high-pressure pipeline; The controller is electrically connected to the second temperature sensor and the first pressure relief valve. The controller is further configured to receive the second temperature signal and regulate the opening and closing of the first pressure relief valve.

5. The thermal shock test chamber according to claim 3, wherein: The first pressure relief valve is a three-way solenoid valve, the inlet of the three-way solenoid valve is connected to the outlet of the condenser, the first outlet of the three-way solenoid valve is connected to the inlet of the high-pressure pipeline, and the second outlet of the three-way solenoid valve is connected to the high-pressure pipeline.

6. The thermal shock test chamber according to claim 3, wherein: The interior of the cooling box is formed with a first air inlet cavity and a second air inlet cavity which are separated from each other, and the second air inlet cavity is arranged around the first air inlet cavity; the first air inlet cavity is connected to the pressure relief pipe and the low-pressure side outlet of the regenerator; the second air inlet cavity is connected to the low-temperature test cavity and the outside world.

7. The thermal shock test chamber according to claim 6, wherein: Along the flow direction in the second air inlet cavity, the cross-sectional area of the second air inlet cavity is gradually reduced.

8. The thermal shock test chamber according to claim 3, wherein: The thermal shock test chamber further includes a second compressor, the outlet of the second compressor is connected to the inlet of the condenser, and the low-pressure side outlet of the regenerator is connected to the inlet of the second compressor.

9. The thermal shock test chamber according to any one of claims 1 to 8, characterized in that: The first compressor is provided with a second pressure relief valve.

10. The thermal shock test chamber according to any one of claims 1 to 8, characterized in that: The first protection device further includes a gas-liquid separator, which is arranged in the cooling pipe.

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