A temperature control system and a method for controlling leakage and suction of heat exchange medium.

Abstract

This application relates to the field of temperature control technology, specifically to a temperature control system and a method for controlling heat exchange medium leakage. The temperature control system includes a compressor and an expansion valve, which are connected by pipelines to form a heat exchange medium circulation loop. The pipeline section between the compressor's exhaust port and the expansion valve's inlet is the high-pressure side pipeline, and the pipeline section between the expansion valve's outlet and the compressor's suction port is the low-pressure side pipeline. The outlet of the vacuum pump is connected to the inlet of the vacuum tank. A high-pressure side recovery valve is connected between the high-pressure side pipeline and the vacuum pump's inlet, and a low-pressure side recovery valve is connected between the low-pressure side pipeline and the vacuum pump's inlet. When a leak occurs in the temperature control system of this application, the residual heat exchange medium in the corresponding pipeline can be drawn into the vacuum tank for storage through the high-pressure side recovery valve and / or the low-pressure side recovery valve, reducing the amount of heat exchange medium escaping to the external environment from the source, reducing resource waste, and lowering the safety risks caused by heat exchange medium leakage.

Description

Technical Field

[0001] This application relates to the field of temperature control technology, specifically to a temperature control system and a method for controlling leakage and suction of heat exchange medium. Background Technology

[0002] With increasing global emphasis on environmental protection, heat exchange media with low Global Warming Potential (GWP) are gradually replacing traditional high GWP heat exchange media. However, some low GWP heat exchange media are flammable, and their leakage in confined spaces may cause combustion or even explosion. In applications with extremely high safety requirements, such as energy storage systems, the safety risks posed by heat exchange media leakage are particularly prominent.

[0003] Currently, preventative measures against leaks of flammable heat exchange media mainly focus on optimizing system sealing, leak detection and alarm systems, and localized ventilation and dilution. These methods are mostly reactive strategies, unable to control the continuous release of heat exchange media into the external environment at the source, resulting in resource waste and still posing certain safety risks.

[0004] Therefore, how to provide a temperature control system that reduces resource waste and lowers the safety risks caused by heat exchange medium leakage has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a temperature control system that reduces resource waste and mitigates the safety risks associated with heat exchange medium leakage. The specific solution is as follows: A temperature control system, comprising: The compressor and the expansion valve are connected by a pipeline to form a heat exchange medium circulation loop; wherein, the pipeline section between the exhaust port of the compressor and the inlet of the expansion valve is the high-pressure side pipeline, and the pipeline section between the outlet of the expansion valve and the suction port of the compressor is the low-pressure side pipeline. A vacuum pump and a vacuum tank, wherein the outlet of the vacuum pump is connected to the inlet of the vacuum tank; A high-pressure side recovery valve is connected between the high-pressure side pipeline and the inlet of the vacuum pump. A low-pressure side recovery valve is connected between the low-pressure side pipeline and the inlet of the vacuum pump.

[0006] In some embodiments, the temperature control system further includes: A high-pressure side pressure sensor is installed in the high-pressure side pipeline; A low-pressure side pressure sensor is installed in the low-pressure side pipeline.

[0007] In some embodiments, the temperature control system further includes: A throttling device is provided, which is connected in series with the high-pressure side recovery valve between the high-pressure side pipeline and the inlet of the vacuum pump.

[0008] In some embodiments, the temperature control system further includes: The flash tank has its inlet connected to both the high-pressure side recovery valve and the low-pressure side recovery valve, and its outlet connected to the inlet of the vacuum pump.

[0009] In some embodiments, the temperature control system further includes: A first heat exchanger and a second heat exchanger, wherein the first heat exchanger is disposed on one of the high-pressure side pipeline and the low-pressure side pipeline and is configured to be connected to the temperature-controlled object for heat exchange; and the second heat exchanger is disposed on the other of the high-pressure side pipeline and the low-pressure side pipeline and is configured to be connected to the external medium for heat exchange; and the second heat exchanger is an air-cooled heat exchanger or a plate heat exchanger.

[0010] In some embodiments, the temperature control system further includes: A first multi-way valve assembly includes a first port, a second port, a third port, and a fourth port. The first port is connected to one end of a second connecting pipe, and the other end of the second connecting pipe is connected to one end of the first connecting pipe. The second port is connected to the suction port of the compressor, the third port is connected to the other end of the first connecting pipe, and the fourth port is connected to the discharge port of the compressor. The first heat exchanger is disposed in the first connecting pipeline, and the second heat exchanger is disposed in the second connecting pipeline.

[0011] In some embodiments, a second multi-way valve assembly is further provided between the first connecting pipeline and the second connecting pipeline. The second multi-way valve assembly includes a fifth port, a sixth port, a seventh port, and an eighth port. The fifth port is connected to the second connecting pipeline, and the sixth port is connected to the first connecting pipeline. The temperature control system also includes a liquid reservoir and a third connecting pipe. The third connecting pipe connects the seventh port and the eighth port. The liquid reservoir and the expansion valve are both located on the third connecting pipe. The liquid reservoir is located on the inlet side of the expansion valve, and the lower end of the liquid reservoir along the direction of gravity is connected to the inlet of the expansion valve.

[0012] In some embodiments, the temperature control system further includes: A throttling device is provided, wherein the high-pressure side recovery valve and the throttling device are connected in series between the high-pressure side pipeline and the inlet of the vacuum pump; The third multi-way valve group has a ninth port, a tenth port, and an eleventh port. The outlet of the high-pressure side recovery valve and the outlet of the low-pressure side recovery valve are both connected to the ninth port. The tenth port is connected to the inlet of the throttling device. The outlet of the throttling device and the eleventh port are both connected to the inlet of the vacuum pump.

[0013] A heat exchange medium leakage suction control method, applied to the above-mentioned temperature control system, includes: Determine whether the temperature control system has leaked, and determine the location of the leak in the temperature control system; If only the low-pressure side pipeline leaks, shut down the compressor and expansion valve, open the low-pressure side recovery valve, start the vacuum pump, pump the heat exchange medium in the low-pressure side pipeline and deliver it to the vacuum tank, and close the low-pressure side recovery valve after the heat exchange medium in the low-pressure side pipeline has been pumped out. In the case of leakage only in the high-pressure side pipeline, shut down the compressor and the expansion valve, open the high-pressure side recovery valve, start the vacuum pump, pump the heat exchange medium in the high-pressure side pipeline and deliver it to the vacuum tank. After the heat exchange medium in the high-pressure side pipeline is pumped out, close the high-pressure side recovery valve after a first preset time. When both the low-pressure side pipeline and the high-pressure side pipeline are leaking, shut down the compressor and the expansion valve, open the high-pressure side recovery valve and the low-pressure side recovery valve, start the vacuum pump, and pump the heat exchange medium in the high-pressure side pipeline and the low-pressure side pipeline to the vacuum tank. After the heat exchange medium in the high-pressure side pipeline and the low-pressure side pipeline has been pumped out, shut down the vacuum pump.

[0014] In some embodiments, determining the location of a leak in the temperature control system includes: Obtain the pressure detection value of the high-pressure side pipeline and the pressure detection value of the low-pressure side pipeline; If the pressure detection value of the low-pressure side pipeline is lower than the first preset pressure, and the pressure drop rate of the low-pressure side pipeline is greater than the preset rate, and the pressure drop rate of the high-pressure side pipeline is less than the preset rate, it is determined that only the low-pressure side pipeline is leaking. If the pressure detection value of the high-pressure side pipeline is lower than the second preset pressure, and the pressure drop rate of the high-pressure side pipeline is greater than the preset rate, and the pressure drop rate of the low-pressure side pipeline is less than the preset rate, it is determined that only the high-pressure side pipeline is leaking. If the pressure detection value of the low-pressure side pipeline is lower than the first preset pressure, the pressure detection value of the high-pressure side pipeline is lower than the second preset pressure, the pressure drop rate of the high-pressure side pipeline is greater than the preset rate, and the pressure drop rate of the low-pressure side pipeline is greater than the preset rate, then it is determined that both the low-pressure side pipeline and the high-pressure side pipeline are leaking.

[0015] In some embodiments, the operating power of the vacuum pump is P1 when only the low-pressure side pipeline leaks, P2 when only the high-pressure side pipeline leaks, and P3 when both the low-pressure side pipeline and the high-pressure side pipeline leak, satisfying: P3 > P2 > P1.

[0016] In some embodiments, determining whether the temperature control system has leaked includes: Obtain the pressure detection values ​​of the high-pressure side pipeline, the low-pressure side pipeline, and the heat exchange medium concentration value of the space where the temperature control system is located. Determine that the temperature control system is leaking if at least one of the following conditions is met: The pressure detection value of the low-pressure side pipeline is lower than the first preset pressure; The pressure detection value of the high-pressure side pipeline is lower than the second preset pressure; The concentration of the heat exchange medium in the space where the temperature control system is located is higher than the preset concentration value.

[0017] In some embodiments, determining that the heat exchange medium in the low-pressure side pipeline and / or the high-pressure side pipeline has been completely drawn off includes: If the pressure in the low-pressure side pipeline and / or the high-pressure side pipeline is lower than a preset pressure threshold, or if the vacuum pump has been running for a second preset duration, it is determined that the heat exchange medium in the low-pressure side pipeline and / or the high-pressure side pipeline has been successfully pumped.

[0018] In some embodiments, when a leak occurs in the low-pressure side pipeline, after closing the low-pressure side recovery valve, the following steps are further included: Open the high-pressure side recovery valve to draw the heat exchange medium in the high-pressure side pipeline and deliver it to the vacuum tank. After the heat exchange medium in the high-pressure side pipeline is drawn out, turn off the vacuum pump.

[0019] In some embodiments, when a leak occurs in the high-pressure side pipeline, after closing the high-pressure side recovery valve after a first preset time delay, the method further includes: Open the low-pressure side recovery valve to draw the heat exchange medium in the low-pressure side pipeline and deliver it to the vacuum tank. After the heat exchange medium in the low-pressure side pipeline is drawn out, turn off the vacuum pump.

[0020] The technical effects of this application are as follows: The temperature control system of this application, through the installation of a vacuum suction pump, a vacuum tank, a high-pressure side recovery valve, and a low-pressure side recovery valve, can adopt targeted suction methods and control strategies for different leakage scenarios, such as leakage in the high-pressure side pipeline, leakage in the low-pressure side pipeline, or leakage in both the high-pressure side pipeline and the low-pressure side pipeline. This minimizes the residual amount of heat exchange medium in the system, thereby reducing the continued escape of heat exchange medium into the external environment, inhibiting the continued increase of the concentration of heat exchange medium in the external environment, improving the overall safety protection efficiency, and enhancing the system safety level. Attached Figure Description

[0021] Figure 1 This is a simplified structural diagram of a first specific embodiment of the temperature control system provided in this application; Figure 2 This is a simplified structural diagram of a second specific embodiment of the temperature control system provided in this application; Figure 3 This is a simplified structural diagram of the third specific embodiment of the temperature control system provided in this application in cooling mode; Figure 4 for Figure 3 A simplified structural diagram of the temperature control system in heating mode; Figure 5 This is a simplified structural diagram of the fourth specific embodiment of the temperature control system provided in this application in cooling mode; Figure 6 for Figure 5 A simplified structural diagram of the temperature control system in heating mode; The annotations in the attached figures are explained as follows: Compressor 100; Expansion valve 101; High-pressure side pipeline 102; Low-pressure side pipeline 103; Vacuum pump 104; Vacuum tank 105; High-pressure side recovery valve 106; Low-pressure side recovery valve 107; High-pressure side pressure sensor 108; Low-pressure side pressure sensor 109; Throttling device 110; Flash tank 111; First heat exchanger 112; Second heat exchanger 113; Gas-liquid separator 114; Liquid receiver 115; First connecting pipeline 116 Second connecting pipe 117; First multi-way valve group 118; First port 118a; Second port 118b; Third port 118c; Fourth port 118d; Third connecting pipe 119; Second multi-way valve group 120; Fifth port 120a; Sixth port 120b; Seventh port 120c; Eighth port 120d; Third multi-way valve group 121; Ninth port 121a; Tenth port 121b; Eleventh port 121c. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this application, the specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0023] In the description of the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0024] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0025] The directional terms used in the embodiments of this application, such as "inner" and "outer," are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. Furthermore, unless otherwise stated in this application, "multiple" as used in this application refers to two or more.

[0026] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0027] In the description of the embodiments in this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] Please refer to Figure 1 , Figure 1 This is a simplified structural diagram of a first specific embodiment of the temperature control system provided in this application.

[0029] In this embodiment of the application, the temperature control system includes a compressor 100 and an expansion valve 101. The compressor 100 has an intake port and an exhaust port, and the expansion valve 101 has an inlet and an outlet. The exhaust port of the compressor 100 is connected to the inlet of the expansion valve 101 through a pipeline, and the outlet of the expansion valve 101 is connected to the intake port of the compressor 100 through a pipeline, thereby forming a heat exchange medium circulation loop.

[0030] Combination Figure 1 To understand, taking the compressor 100 and expansion valve 101 as the boundary, the heat exchange medium circulation loop includes a high-pressure side pipeline 102 and a low-pressure side pipeline 103. The pipeline section between the discharge port of the compressor 100 and the inlet of the expansion valve 101 is the high-pressure side pipeline 102, meaning the discharge port of the compressor 100 is the starting point of the high-pressure side, and the inlet of the expansion valve 101 is the ending point of the high-pressure side. The pipeline section between the outlet of the expansion valve 101 and the suction port of the compressor 100 is the low-pressure side pipeline 103, meaning the outlet of the expansion valve 101 is the starting point of the low-pressure side, and the suction port of the compressor 100 is the ending point of the low-pressure side.

[0031] In this embodiment of the application, the temperature control system further includes a vacuum pump 104 and a vacuum tank 105. The vacuum pump 104 has an inlet and an outlet, and the vacuum tank 105 has an inlet and an outlet. The outlet of the vacuum pump 104 is connected to the inlet of the vacuum tank 105.

[0032] The temperature control system also includes a high-pressure side recovery valve 106 and a low-pressure side recovery valve 107. The high-pressure side recovery valve 106 is connected between the high-pressure side pipeline 102 and the inlet of the vacuum pump 104, and the low-pressure side recovery valve 107 is connected between the low-pressure side pipeline 103 and the inlet of the vacuum pump 104.

[0033] As described above, the high-pressure side pipeline 102 and the low-pressure side pipeline 103 are separated by an expansion valve 101. The expansion valve 101 is a throttling element. If a recovery valve is only installed on the high-pressure side or the low-pressure side, the refrigerant in the other pipeline must pass through the expansion valve 101 to be recovered, resulting in extremely high suction resistance and low recovery efficiency. However, this embodiment of the application provides independent recovery valves on both the high-pressure and low-pressure sides. When a leak occurs on the high-pressure side and / or the low-pressure side, the corresponding recovery valve can be opened and the vacuum pump 104 can be started to draw the residual heat exchange medium from the leak area into the vacuum tank 105 for storage, reducing the amount of heat exchange medium escaping to the external environment from the source. Specifically: If the leak occurs in the high-pressure side pipeline 102, the compressor 100 and expansion valve 101 can be shut down to reduce the flow of heat exchange medium from the low-pressure side pipeline 103 into the leak area. The high-pressure side recovery valve 106 can be opened and the vacuum pump 104 can be started. The heat exchange medium in the high-pressure side pipeline 102 enters the vacuum pump 104 through the high-pressure side recovery valve 106 and is then transported to the vacuum tank 105. After the heat exchange medium in the high-pressure side pipeline 102 is completely pumped out, the amount of residual heat exchange medium in the leak area is significantly reduced, reducing the continued escape of heat exchange medium into the external environment and reducing the amount of heat exchange medium leakage.

[0034] If the leak occurs in the low-pressure side pipeline 103, the compressor 100 and expansion valve 101 can be shut down to reduce the flow of heat exchange medium from the high-pressure side pipeline 102 into the leak area. The low-pressure side recovery valve 107 can be opened and the vacuum pump 104 can be started. The heat exchange medium in the low-pressure side pipeline 103 enters the vacuum pump 104 through the low-pressure side recovery valve 107 and is then transported to the vacuum tank 105. After the heat exchange medium in the low-pressure side pipeline 103 is completely pumped out, the amount of residual heat exchange medium in the leak area is significantly reduced, reducing the continued escape of heat exchange medium into the external environment and reducing the amount of heat exchange medium leakage.

[0035] If both the high-pressure side pipeline 102 and the low-pressure side pipeline 103 leak, the high-pressure side recovery valve 106 and the low-pressure side recovery valve 107 can be opened simultaneously to draw in heat exchange medium from both sides for rapid recovery.

[0036] Therefore, the temperature control system of this application embodiment, through the setting of vacuum suction pump 104, vacuum tank 105, high-pressure side recovery valve 106 and low-pressure side recovery valve 107, can adopt targeted suction methods and control strategies for different leakage scenarios, such as leakage only in high-pressure side pipeline 102, leakage only in low-pressure side pipeline 103, or leakage in both high-pressure side pipeline 102 and low-pressure side pipeline 103. This minimizes the residual amount of heat exchange medium in the system, thereby reducing the continued escape of heat exchange medium into the external environment and inhibiting the continued increase of heat exchange medium concentration in the external environment. Especially when the heat exchange medium is a flammable medium, it improves the overall safety protection efficiency and enhances the system safety level.

[0037] Please continue to refer to this. Figure 1 In some embodiments, the temperature control system further includes a high-pressure side pressure sensor 108 and a low-pressure side pressure sensor 109, with the high-pressure side pressure sensor 108 disposed in the high-pressure side pipeline 102 and the low-pressure side pressure sensor 109 disposed in the low-pressure side pipeline 103.

[0038] By setting a high-pressure side pressure sensor 108 and a low-pressure side pressure sensor 109, the pressure changes of the high-pressure side pipeline 102 and the low-pressure side pipeline 103 can be monitored in real time. When a pipeline leaks, the pressure on the corresponding side will drop abnormally. Based on the pressure detection values ​​of the two pressure sensors and the pressure drop rate, it can be determined whether a leak has occurred and the location of the leak. Then, the opening and closing of the corresponding recovery valve and the start of the vacuum pump 104 are automatically controlled to achieve accurate identification of the leak location and intelligent control of suction and recovery.

[0039] In some other embodiments, the temperature control system also includes a concentration detection device, located within the space where the temperature control system is situated, for detecting the concentration of the heat exchange medium in that space. If the concentration of the heat exchange medium in the space where the temperature control system is situated is higher than a preset concentration value, it can be determined that a leak has occurred in the temperature control system. Based on this, the location of the leak can be further determined by the pressure drop rate obtained from the high-pressure side pressure sensor 108 and the low-pressure side pressure sensor 109. Specifically, the concentration detection device can be a gas sensor.

[0040] Please continue to refer to this. Figure 1 In some embodiments, the temperature control system further includes a throttling device 110, which and the high-pressure side recovery valve 106 are connected in series between the high-pressure side pipeline 102 and the inlet of the vacuum pump 104.

[0041] The throttling device 110 can specifically be a component with throttling and pressure reduction functions, such as an electronic expansion valve. Under normal operating conditions, the heat exchange medium pressure in the high-pressure side pipeline 102 is high. If the high-pressure side recovery valve 106 is opened, the high-pressure heat exchange medium directly enters the vacuum pump 104, which will impact the vacuum pump 104, affecting its service life and even causing damage. Therefore, in this embodiment, the throttling device 110 and the high-pressure side recovery valve 106 are connected in series on the recovery path of the high-pressure side pipeline 102. When a leak occurs on the high-pressure side, the high-pressure heat exchange medium first passes through the throttling device 110 to reduce its pressure before entering the vacuum pump 104, reducing the direct impact of the high-pressure heat exchange medium on the vacuum pump 104, thus protecting the vacuum pump 104 and extending its service life.

[0042] It should be noted that the throttling device 110 can be installed upstream of the high-pressure side recovery valve 106 or downstream of the high-pressure side recovery valve 106, both of which can achieve the function of throttling and reducing pressure. Upstream refers to the side closer to the high-pressure side pipeline 102, and downstream refers to the side closer to the inlet of the vacuum suction pump 104.

[0043] Please continue to refer to this. Figure 1In some embodiments of this application, the temperature control system further includes a flash tank 111, the inlet of which is connected to both the high-pressure side recovery valve 106 and the low-pressure side recovery valve 107, and the outlet of which is connected to the inlet of the vacuum pump 104.

[0044] During the heat exchange medium extraction and recovery process, the heat exchange medium entering the recovery pipeline may exist in a gas-liquid two-phase state. If the liquid heat exchange medium directly enters the vacuum pump 104, it will impact the vacuum pump 104 and affect its service life. Based on this, this embodiment of the application sets up a flash tank 111 in front of the inlet of the vacuum pump 104 to achieve gas-liquid separation, reduce the amount of liquid heat exchange medium entering the vacuum pump 104, and reduce the possibility of damage to the vacuum pump 104 due to liquid impact.

[0045] Please refer to Figure 1 and Figure 2 , Figure 2 This is a simplified structural diagram of a second specific embodiment of the temperature control system provided in this application.

[0046] In this embodiment, the temperature control system further includes a first heat exchanger 112 and a second heat exchanger 113. The first heat exchanger 112 is disposed on one of the high-pressure side pipeline 102 and the low-pressure side pipeline 103, and the second heat exchanger 113 is disposed on the other of the high-pressure side pipeline 102 and the low-pressure side pipeline 103. The first heat exchanger 112 is configured to be heat-exchange connected to the temperature-controlled object, which may specifically be a battery module of an energy storage system or other loads requiring temperature control. The second heat exchanger 113 is configured to exchange heat with an external medium. The second heat exchanger 113 is an air-cooled heat exchanger or a plate heat exchanger. The air-cooled heat exchanger uses a fan to drive air to flow across the heat exchange surface to exchange heat with the heat exchange medium, where the external medium is air. The plate heat exchanger heats or cools the heat exchange medium in the temperature control system by exchanging heat with other heat exchange media, where the external medium is water or other refrigerant. The first heat exchanger 112 can be a plate heat exchanger.

[0047] When the first heat exchanger 112 is located on the high-pressure side pipeline 102 and the second heat exchanger 113 is located on the low-pressure side pipeline 103, the temperature control system is in heating mode. The first heat exchanger 112 acts as a condenser, heating the controlled object, while the second heat exchanger 113 acts as an evaporator, heating the heat exchange medium. When the first heat exchanger 112 is located on the low-pressure side pipeline 103 and the second heat exchanger 113 is located on the high-pressure side pipeline 102, the temperature control system is in cooling mode. The first heat exchanger 112 acts as an evaporator, cooling the controlled object, while the second heat exchanger 113 acts as a condenser, cooling the heat exchange medium. Therefore, the functions of the first heat exchanger 112 and the second heat exchanger 113 are reversed in either heating or cooling mode.

[0048] like Figure 1 and Figure 2 As shown, in some embodiments, the temperature control system also includes a gas-liquid separator 114, which is disposed in front of the suction port of the compressor 100 and is used to separate the heat exchange medium entering the compressor 100 into gas and liquid, so that the compressor 100 draws in gaseous heat exchange medium as much as possible, thereby reducing the possibility of the compressor 100 being damaged by liquid slugging.

[0049] Please refer to Figures 3-6 , Figure 3 This is a simplified structural diagram of the third specific embodiment of the temperature control system provided in this application in cooling mode; Figure 4 for Figure 3 A simplified structural diagram of the temperature control system in heating mode; Figure 5 This is a simplified structural diagram of the fourth specific embodiment of the temperature control system provided in this application in cooling mode; Figure 6 for Figure 5 A simplified diagram of the temperature control system in heating mode.

[0050] In this embodiment of the application, the temperature control system further includes a first multi-way valve group 118. The first multi-way valve group 118 includes a first port 118a, a second port 118b, a third port 118c, and a fourth port 118d. The first port 118a is connected to one end of the second connecting pipe 117, and the other end of the second connecting pipe 117 is connected to one end of the first connecting pipe 116. The second port 118b is connected to the suction port of the compressor 100, the third port 118c is connected to the other end of the first connecting pipe 116, and the fourth port 118d is connected to the discharge port of the compressor 100.

[0051] The first heat exchanger 112 is installed in the first connecting pipe 116, and the second heat exchanger 113 is installed in the second connecting pipe 117.

[0052] The first multi-way valve assembly 118 has a first working position and a second working position, such as Figure 3 As shown, in the first operating position, the first port 118a and the fourth port 118d are connected, and the second port 118b and the third port 118c are connected. At this time, the high-temperature and high-pressure gaseous heat exchange medium discharged from the compressor 100 enters the second connecting pipe 117 through the fourth port 118d and the first port 118a. It condenses into a liquid in the second heat exchanger 113. After the liquid heat exchange medium is throttled and depressurized by the expansion valve 101, it enters the first connecting pipe 116. After cooling the temperature-controlled object in the first heat exchanger 112, it absorbs heat and becomes gaseous or a gas-liquid two-phase medium. After the gaseous heat exchange medium or the gas-liquid two-phase heat exchange medium completes gas-liquid separation through the gas-liquid separator 114, it returns to the suction port of the compressor 100. It can be seen that the temperature control system is in cooling mode at this time.

[0053] like Figure 4As shown, in the second operating position, the first port 118a and the second port 118b are connected, and the fourth port 118d and the third port 118c are connected. At this time, the high-temperature, high-pressure gaseous heat exchange medium discharged from the compressor 100 enters the first connecting pipe 116 through the fourth port 118d and the third port 118c. After heating the temperature-controlled object in the first heat exchanger 112, it condenses and releases heat, becoming liquid. The liquid heat exchange medium, after being throttled and depressurized by the expansion valve 101, enters the second connecting pipe 117. In the second heat exchanger 113, it evaporates and absorbs heat, becoming gaseous or a gas-liquid two-phase medium. The gaseous heat exchange medium or the gas-liquid two-phase heat exchange medium enters the gas-liquid separator 114 through the first port 118a and the second port 118b to complete gas-liquid separation, and then returns to the suction port of the compressor 100. Therefore, the temperature control system is in heating mode at this time.

[0054] In energy storage systems, cooling is needed in summer to remove the heat generated by the charging and discharging of battery modules, while heating may be required in winter to ensure the normal operation of battery modules in low-temperature environments. Through the configuration of the first multi-way valve group 118 as described above, the temperature control system of this embodiment can flexibly switch between cooling and heating modes to meet the temperature control needs of different scenarios, demonstrating good versatility and adaptability.

[0055] It should be noted that, Figures 3 to 6 The diagram shows the connections under different operating modes. Reference numeral 106 indicates the recovery valve connected to the high-pressure side pipeline 102 under the current operating mode, and reference numeral 107 indicates the recovery valve connected to the low-pressure side pipeline 103 under the current operating mode.

[0056] Please continue to refer to this. Figures 3-6 In this embodiment of the application, a second multi-way valve group 120 is further provided between the first connecting pipe 116 and the second connecting pipe 117. The second multi-way valve group 120 includes a fifth port 120a, a sixth port 120b, a seventh port 120c and an eighth port 120d. The fifth port 120a is connected to the second connecting pipe 117 and the sixth port 120b is connected to the first connecting pipe 116. The temperature control system also includes a reservoir 115 and a third connecting pipe 119. The third connecting pipe 119 connects the seventh port 120c and the eighth port 120d. The reservoir 115 and the expansion valve 101 are both located in the third connecting pipe 119. The reservoir 115 is located on the inlet side of the expansion valve 101. The lower end of the reservoir 115 along the direction of gravity is connected to the inlet of the expansion valve 101.

[0057] As configured above, the liquid receiver 115 is used to store the liquid heat exchange medium in the system to stabilize the system pressure. At the same time, under the action of gravity, the liquid refrigerant is deposited at the bottom and flows into the expansion valve 101 through the lower outlet, which effectively reduces the amount of gaseous refrigerant entering the expansion valve 101 and improves the stability of the liquid supply at the inlet of the expansion valve 101 and the throttling control accuracy.

[0058] The second multi-way valve group 120 has a third working position and a fourth working position. In the third working position, the fifth port 120a and the eighth port 120d are connected, and the sixth port 120b and the seventh port 120c are connected. The liquid heat exchange medium from the second connecting pipe 117 enters the third connecting pipe 119 through the fifth port 120a and the eighth port 120d, and flows through the liquid reservoir 115 and the expansion valve 101 in sequence. The heat exchange medium after pressure reduction enters the first connecting pipe 116 through the seventh port 120c and the sixth port 120b.

[0059] In the fourth working position, the fifth port 120a and the seventh port 120c are connected, and the sixth port 120b and the eighth port 120d are connected. The liquid heat exchange medium from the first connecting pipe 116 enters the third connecting pipe 119 through the sixth port 120b and the eighth port 120d, and flows through the liquid reservoir 115 and the expansion valve 101 in sequence. The heat exchange medium after pressure reduction enters the second connecting pipe 117 through the seventh port 120c and the fifth port 120a.

[0060] Therefore, by setting the second multi-way valve group 120, it is ensured that the liquid receiver 115 is always located in front of the expansion valve 101, regardless of whether the temperature control system is in cooling mode or heating mode. This effectively reduces the amount of gaseous refrigerant entering the expansion valve 101 and improves the liquid supply stability and throttling control accuracy at the inlet of the expansion valve 101.

[0061] Please continue to refer to this. Figures 3-6 In this embodiment of the application, the temperature control system further includes a third multi-way valve group 121. The third multi-way valve group 121 has a ninth port 121a, a tenth port 121b and an eleventh port 121c. The outlet of the high-pressure side recovery valve 106 and the outlet of the low-pressure side recovery valve 107 are both connected to the ninth port 121a. The tenth port 121b is connected to the inlet of the throttling device 110. The outlet of the throttling device 110 and the eleventh port 121c are both connected to the inlet of the vacuum suction pump 104.

[0062] The third multi-way valve group 121 has a fifth working position and a sixth working position. In the fifth working position, the ninth port 121a and the tenth port 121b are connected. The high-pressure heat exchange medium drawn from the high-pressure side recovery valve 106 enters the throttling device 110 through the ninth port 121a and the tenth port 121b. After being throttled and depressurized, it enters the vacuum suction pump 104, thereby protecting the vacuum suction pump 104.

[0063] In the sixth working position, the ninth port 121a and the eleventh port 121c are connected. The low-pressure heat exchange medium drawn from the low-pressure side recovery valve 107 directly enters the vacuum pump 104 through the ninth port 121a and the eleventh port 121c, without passing through the throttling device 110, thereby reducing flow resistance and improving the low-pressure side suction efficiency.

[0064] When both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 are leaking, the third multi-way valve group 121 is in the fifth working position, with the ninth port 121a and the tenth port 121b connected, so that the heat exchange medium extracted from the high-pressure side pipeline 102 and the low-pressure side pipeline 103 enters the vacuum suction pump 104 after passing through the throttling device 110.

[0065] exist Figures 1-6 In the diagram, the red arrows indicate the heat exchange medium recovery path when a leak occurs on the high-pressure side, and the blue arrows indicate the heat exchange medium recovery path when a leak occurs on the low-pressure side. In the heat pump system, due to the reversing action of the first multi-way valve group 118, the positions of the high-pressure side pipe 102 and the low-pressure side pipe 103 change with the switching of cooling / heating modes. For example, in… Figure 3 and Figure 5 In the cooling mode shown, the second connecting pipe 117 constitutes the high-pressure side pipe 102, and the first connecting pipe 116 constitutes the low-pressure side pipe 103. Figure 4 and Figure 6 In the heating mode shown, the second connecting pipe 117 constitutes the low-pressure side pipe 103, and the first connecting pipe 116 constitutes the high-pressure side pipe 102. This embodiment ensures that the high-pressure side suction path always passes through the throttling device 110 by switching the third multi-way valve group 121, thereby protecting the vacuum suction pump 104 from direct impact by the high-pressure refrigerant. Meanwhile, the low-pressure side suction path can bypass the throttling device 110, achieving matching between the suction path and the system operating mode. This allows the system to maintain stable operation under different operating conditions and ensures the safety and controllability of the refrigerant recovery path.

[0066] The temperature control system in this application embodiment can be a single-loop refrigeration system, a dual secondary heat exchange system, or a heat pump system.

[0067] This application also provides a method for controlling heat exchange medium leakage and suction, which can be applied to the temperature control system described in any of the above embodiments. The executing entity of the control method can be the controller of the temperature control system, or a host computer or cloud control platform that is communicatively connected to the temperature control system.

[0068] In this embodiment of the application, the heat exchange medium leakage suction control method includes: Determine if there is a leak in the temperature control system and locate the leak.

[0069] When only the low-pressure side pipeline 103 is leaking, the compressor 100 and expansion valve 101 are shut down. Shutting down the compressor 100 and expansion valve 101 reduces the flow of heat exchange medium between the high-pressure side pipeline 102 and the low-pressure side pipeline 103, reducing the continuous inflow of high-pressure side heat exchange medium into the leak area and thus reducing the total leakage. Then, the low-pressure side recovery valve 107 is opened, and the vacuum pump 104 is started to draw the heat exchange medium from the low-pressure side pipeline 103 and deliver it to the vacuum tank 105. Since the refrigerant pressure on the low-pressure side is low, the vacuum pump 104 can operate at lower power, meeting the suction requirements while saving energy. After the heat exchange medium in the low-pressure side pipeline 103 is completely drawn out, the low-pressure side recovery valve 107 is closed. At this point, the heat exchange medium in the leak area has been completely drawn out, the compressor 100 stops running, and the expansion valve 101 is closed. The flow of high-pressure side heat exchange medium into the leak area is reduced, thereby reducing the amount of heat exchange medium leakage.

[0070] When only the high-pressure side pipeline 102 leaks, the compressor 100 and expansion valve 101 are shut off. This is also to reduce the flow of heat exchange medium between the high-pressure side pipeline 102 and the low-pressure side pipeline 103, thereby reducing the continuous inflow of low-pressure side heat exchange medium into the leak area and reducing the total leakage. Then, the high-pressure side recovery valve 106 is opened, and the vacuum pump 104 is started to draw the heat exchange medium in the high-pressure side pipeline 102 and deliver it to the vacuum tank 105. Since the refrigerant pressure on the high-pressure side is high, the vacuum pump 104 needs to operate at high power for efficient evacuation. After the heat exchange medium in the high-pressure side pipeline 102 has been evacuated, the high-pressure side recovery valve 106 is closed after a first preset time delay. The purpose of the delayed closure is to connect the leak port with the external environment. After the high-pressure side suction is completed, the high-pressure side pressure has dropped to a low level. After the high-pressure side heat exchange medium is suctioned, the high-pressure side recovery valve 106 is kept open for a first preset time so that the external air can enter the high-pressure side pipeline through the leak port, thereby reducing the pressure difference between the high-pressure side pipeline and the external environment and reducing the impact of the pressure difference on the vacuum suction pump 104.

[0071] The specific value of the first preset duration is not limited and can be set according to the actual working conditions.

[0072] When both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 are leaking, shut down the compressor 100 and the expansion valve 101, open the high-pressure side recovery valve 106 and the low-pressure side recovery valve 107, start the vacuum pump 104 to run at full speed, and simultaneously pump the heat exchange medium in the low-pressure side pipeline 103 and the high-pressure side pipeline 102 and transport it to the vacuum tank 105 to extract the residual heat exchange medium in the system in a shorter time. After the heat exchange medium in the high-pressure side pipeline 102 and the low-pressure side pipeline 103 has been pumped out, shut down the vacuum pump 104.

[0073] Therefore, the heat exchange medium leakage suction control method of this application embodiment can adopt targeted suction methods and control strategies for different leakage scenarios, such as leakage only in the high-pressure side pipeline 102, leakage only in the low-pressure side pipeline 103, or leakage in both the high-pressure side pipeline 102 and the low-pressure side pipeline 103. This minimizes the residual amount of heat exchange medium in the system, reduces the continued escape of heat exchange medium into the external environment, inhibits the continued increase of heat exchange medium concentration in the external environment, improves the overall safety protection efficiency, and enhances the system safety level.

[0074] In this embodiment of the application, the method for determining the leakage location of the temperature control system includes: Obtain the pressure detection value of the high-pressure side pipeline 102 and the pressure detection value of the low-pressure side pipeline 103.

[0075] If the pressure detection value of the low-pressure side pipeline 103 is lower than the first preset pressure, and the pressure drop rate of the low-pressure side pipeline 103 is greater than the preset rate, while the pressure drop rate of the high-pressure side pipeline 102 is less than the preset rate, it is determined that only the low-pressure side pipeline 103 is leaking. In this case, the pressure detection value of the low-pressure side pipeline 103 is lower than the first preset pressure, the low-pressure side pressure drops rapidly while the high-pressure side pressure changes slowly, indicating that the rupture is located on the low-pressure side. Due to the obstruction of the expansion valve 101, the leakage on the low-pressure side has a small impact on the high-pressure side pressure, and the pressure drop rate on the high-pressure side is lower than that on the low-pressure side.

[0076] If the pressure detection value of the high-pressure side pipeline 102 is lower than the second preset pressure, and the pressure drop rate of the high-pressure side pipeline 102 is greater than the preset rate, while the pressure drop rate of the low-pressure side pipeline 103 is less than the preset rate, it is determined that only the high-pressure side pipeline 102 is leaking. In this case, the pressure detection value of the high-pressure side pipeline 102 is lower than the second preset pressure, the high-pressure side pressure drops rapidly while the low-pressure side pressure changes slowly, indicating that the rupture is located on the high-pressure side.

[0077] If the pressure detection value of the low-pressure side pipeline 103 is lower than the first preset pressure, the pressure detection value of the high-pressure side pipeline 102 is lower than the second preset pressure, the pressure drop rate of the high-pressure side pipeline 102 is greater than the preset rate, and the pressure drop rate of the low-pressure side pipeline 103 is greater than the preset rate, then it is determined that both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 are leaking. In this case, the pressure on both sides drops rapidly and synchronously, indicating that the rupture is located on both the low-pressure side and the high-pressure side simultaneously.

[0078] The specific values ​​of the first preset pressure, the second preset pressure, and the preset speed can be set according to the system design parameters and actual working conditions. This application does not impose any specific limitations on these values.

[0079] In this embodiment, the vacuum pump 104 operates at different power levels depending on the location of the leak. When only the low-pressure side pipeline 103 leaks, the operating power of the vacuum pump 104 is P1; when only the high-pressure side pipeline 102 leaks, the operating power is P2; and when both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 leak, the operating power is P3. The three operating power levels satisfy the following order: P3 > P2 > P1.

[0080] The low-pressure side heat exchange medium has a lower pressure, so it can meet the suction requirements with a lower operating power P1, which is also beneficial for energy saving. The high-pressure side heat exchange medium has a higher pressure, so a higher operating power P2 is required to overcome the high pressure difference for suction and improve suction efficiency. In emergency situations where both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 leak, the vacuum suction pump 104 needs to run at full speed with the highest operating power P3 to extract the heat exchange medium in the system in the shortest possible time. The operating power of the vacuum suction pump 104 increases step by step according to the severity and location of the leak, taking into account both suction efficiency and energy consumption.

[0081] In some embodiments, determining whether a leak has occurred in the temperature control system can also be done by combining the concentration value of the heat exchange medium in the space where the temperature control system is located. Specifically, the pressure detection value of the high-pressure side pipeline 102, the pressure detection value of the low-pressure side pipeline 103, and the concentration value of the heat exchange medium in the space where the temperature control system is located are obtained. A leak in the temperature control system is determined to occur if at least one of the following conditions is met: The pressure detection value of the low-pressure side pipeline 103 is lower than the first preset pressure; The pressure reading of the high-pressure side pipeline 102 is lower than the second preset pressure. The concentration of the heat exchange medium in the space where the temperature control system is located is higher than the preset concentration value.

[0082] Combining pressure detection with concentration detection can improve the reliability and response speed of leak detection.

[0083] In this embodiment of the application, determining that the heat exchange medium in the low-pressure side pipeline 103 and / or the high-pressure side pipeline 102 has been completely drawn off includes: If the pressure in the low-pressure side pipeline 103 and / or the high-pressure side pipeline 102 is lower than the preset pressure threshold, or if the operating time of the vacuum pump 104 reaches the second preset duration, it is determined that the heat exchange medium in the low-pressure side pipeline 103 and / or the high-pressure side pipeline 102 has been successfully pumped.

[0084] Specifically, when only the low-pressure side pipeline 103 is pumped, when the pressure of the low-pressure side pipeline 103 is lower than the preset pressure threshold, or when the operating time of the vacuum pump 104 reaches the second preset duration, it is determined that the heat exchange medium in the low-pressure side pipeline 103 has been pumped out.

[0085] When only the high-pressure side pipeline 102 is pumped, if the pressure of the high-pressure side pipeline 102 is lower than the preset pressure threshold, or the operating time of the vacuum pump 104 reaches the second preset duration, it is determined that the heat exchange medium in the high-pressure side pipeline 102 has been pumped out.

[0086] When both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 are being pumped simultaneously, if the pressure of both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 is lower than a preset pressure threshold, or if the operating time of the vacuum pump 104 reaches a second preset duration, it is determined that the heat exchange medium in both the low-pressure side pipeline 103 and the high-pressure side pipeline 102 has been completely pumped out.

[0087] As set up above, the system pressure can be used to determine whether the heat exchange medium has been completely pumped out. When the system pressure drops to a sufficiently low level (e.g., below 0.05 MPa), it indicates that the residual heat exchange medium in the pipeline has been basically emptied. Alternatively, the running time can be used to determine whether the heat exchange medium has been completely pumped out, and the corresponding recovery valve and / or vacuum pump 104 control can be executed to ensure sufficient recovery of the heat exchange medium and avoid excessive operation of the vacuum pump 104.

[0088] The second preset time is set specifically based on the volume of the corresponding pipeline, the suction capacity of the vacuum pump, and the leakage conditions. The second preset time is not less than the time required for the heat exchange medium in the corresponding pipeline to be completely suctioned. Therefore, when the vacuum pump has been running for the second preset time, it can be determined that the heat exchange medium in the corresponding pipeline has been completely suctioned.

[0089] In this embodiment of the application, when only the low-pressure side pipeline 103 leaks, after closing the low-pressure side recovery valve 107, the following is further included: Open the high-pressure side recovery valve 106 to draw the heat exchange medium in the high-pressure side pipeline 102 and transport it to the vacuum tank 105. After the heat exchange medium in the high-pressure side pipeline 102 is drawn, turn off the vacuum pump 104.

[0090] Thus, after the heat exchange medium in the high-pressure side pipeline 102 is evacuated, the residual heat exchange medium in the system has been basically evacuated, which facilitates subsequent maintenance operations.

[0091] In this embodiment of the application, when only the high-pressure side pipeline 102 leaks, after closing the high-pressure side recovery valve 106 after a first preset time delay, the following steps are also included: Open the low-pressure side recovery valve 107, draw the heat exchange medium in the low-pressure side pipeline 103 and transport it to the vacuum tank 105. After the heat exchange medium in the low-pressure side pipeline 103 is drawn out, turn off the vacuum pump 104.

[0092] Thus, after the heat exchange medium in the low-pressure side pipeline 103 is evacuated, the residual heat exchange medium in the system has been basically evacuated, which facilitates subsequent maintenance operations.

[0093] In summary, this application embodiment overcomes several shortcomings of existing technologies in flammable refrigerant leakage protection by introducing an active recovery mechanism of vacuum pump 104 and vacuum tank 105, combined with pressure drop rate and intelligent control strategy. This achieves a shift from passive response to active intervention, significantly improving system safety and reliability. Compared to passive protection methods in existing technologies, this application embodiment can quickly locate the leak after detecting an abnormal pressure and initiate directional suction in the shortest possible time, extracting the residual heat exchange medium from the leak area and isolating it in vacuum tank 105. This effectively controls the concentration of the heat exchange medium within the system space, preventing it from reaching the flammability threshold. Experimental data shows that the system using this application embodiment can initiate the suction process within 30 seconds after a heat exchange medium leak and recover more than 90% of the heat exchange medium within 5 minutes, significantly outperforming the response capability of traditional ventilation dilution methods, which require at least 10 minutes to reduce the concentration to a safe range.

[0094] For high-pressure side leakage, this embodiment of the application connects a throttling device 110 in series before the vacuum pump 104 to effectively reduce the pressure of the high-pressure refrigerant. This design avoids the direct impact of the high-pressure refrigerant on the vacuum pump 104, extends the service life of the equipment, and improves the pumping efficiency. According to tests, after adopting the throttling device 110, the pumping efficiency of the vacuum pump 104 in handling high-pressure side leakage increased by 25%, while the equipment failure rate decreased by more than 60%. For low-pressure side leakage, the system adopts a low-power operation strategy, which ensures effective pumping under low gas density conditions while significantly reducing energy consumption. Energy consumption during low-pressure side pumping is reduced by 35%, improving energy efficiency while maintaining system safety.

[0095] This application embodiment also introduces a combined control structure of a third multi-way valve group and a multi-way valve group to realize intelligent switching of the high-pressure side and low-pressure side suction paths and forced introduction of the throttling mechanism, thereby ensuring that the vacuum suction pump 104 can operate safely under different pressure conditions, so that the system can still maintain accurate identification of leakage paths and efficient suction when switching between heating mode and cooling mode, thus enhancing versatility and adaptability.

[0096] Meanwhile, the system improves the accuracy of leak location determination by analyzing the pressure drop rate. Experiments show that the accuracy rate of leak identification on the high-pressure side and low-pressure side in this embodiment reaches 98% and 95% respectively, which is far higher than the identification method based on a single sensor, effectively avoiding misjudgment and response delay.

[0097] Furthermore, this application embodiment features a system-wide synchronous suction strategy to address emergencies such as simultaneous leaks on both sides (high and low pressure sides). This strategy, by simultaneously opening the high-pressure and low-pressure recovery valves, enables the vacuum pump 104 to operate at full speed, quickly extracting most of the refrigerant from the system and minimizing the concentration of flammable gases. In simulated dual-side leak tests, this strategy reduced the system pressure to below 0.05 MPa within 3 minutes, more than 60% faster than traditional methods, significantly enhancing the system's emergency response capability.

[0098] In some energy storage systems, the installation positions of the vacuum pump 104 and the vacuum tank 105 can be optimized according to space constraints. In multi-loop systems, multiple vacuum pumps 104 and recovery paths can be set up to achieve parallel treatment of multiple leak points. At the same time, the operating power of the vacuum pump 104 can be dynamically adjusted according to the system pressure status, thereby maintaining efficient and energy-saving suction under different operating conditions.

[0099] In summary, this application significantly improves the safety, response speed, and energy efficiency of heat exchange medium leakage handling through active suction mechanism, intelligent pressure identification, dynamic power adjustment, and path control. Compared with existing technologies, it not only achieves rapid location and efficient recovery of leaks on both sides, but also maintains stable and reliable operation under various system configurations and operating modes, demonstrating broad application prospects and significant technological advancements.

[0100] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A temperature control system, characterized in that, include: The compressor (100) and the expansion valve (101) are connected by a pipeline to form a heat exchange medium circulation loop; wherein, the pipeline section between the exhaust port of the compressor (100) and the inlet of the expansion valve (101) is the high-pressure side pipeline (102), and the pipeline section between the outlet of the expansion valve (101) and the suction port of the compressor (100) is the low-pressure side pipeline (103). A vacuum pump (104) and a vacuum tank (105), wherein the outlet of the vacuum pump (104) is connected to the inlet of the vacuum tank (105); A high-pressure side recovery valve (106) is connected between the high-pressure side pipeline (102) and the inlet of the vacuum pump (104); A low-pressure side recovery valve (107) is connected between the low-pressure side pipeline (103) and the inlet of the vacuum pump (104).

2. The temperature control system according to claim 1, characterized in that, The temperature control system also includes: A high-pressure side pressure sensor (108) is installed in the high-pressure side pipeline (102). A low-pressure side pressure sensor (109) is installed in the low-pressure side pipeline (103).

3. The temperature control system according to claim 1, characterized in that, The temperature control system also includes: A throttling device (110) is connected in series between the high-pressure side pipeline (102) and the inlet of the vacuum pump (104). The high-pressure side recovery valve (106) and the throttling device (110) are arranged in series between the high-pressure side pipeline (102) and the inlet of the vacuum pump (104).

4. The temperature control system according to claim 1, characterized in that, The temperature control system also includes: The flash tank (111) is connected to both the high-pressure side recovery valve (106) and the low-pressure side recovery valve (107) at its inlet, and the outlet of the flash tank (111) is connected to the inlet of the vacuum pump (104).

5. The temperature control system according to claim 1, characterized in that, The temperature control system also includes: A first heat exchanger (112) and a second heat exchanger (113), wherein the first heat exchanger (112) is disposed on one of the high-pressure side pipeline (102) and the low-pressure side pipeline (103), and the first heat exchanger (112) is configured to be connected to the temperature-controlled object for heat exchange; the second heat exchanger (113) is disposed on the other of the high-pressure side pipeline (102) and the low-pressure side pipeline (103), and the second heat exchanger (113) is configured to be connected to the external medium for heat exchange; the second heat exchanger (113) is an air-cooled heat exchanger or a plate heat exchanger.

6. The temperature control system according to claim 5, characterized in that, The temperature control system also includes: A first multi-way valve assembly (118) includes a first port (118a), a second port (118b), a third port (118c), and a fourth port (118d). The first port (118a) is connected to one end of a second connecting pipe (117), and the other end of the second connecting pipe (117) is connected to one end of a first connecting pipe (116). The second port (118b) is connected to the suction port of the compressor (100), the third port (118c) is connected to the other end of the first connecting pipe (116), and the fourth port (118d) is connected to the discharge port of the compressor (100). The first heat exchanger (112) is disposed in the first connecting pipe (116), and the second heat exchanger (113) is disposed in the second connecting pipe (117).

7. The temperature control system according to claim 6, characterized in that, A second multi-way valve group (120) is also provided between the first connecting pipe (116) and the second connecting pipe (117). The second multi-way valve group (120) includes a fifth port (120a), a sixth port (120b), a seventh port (120c) and an eighth port (120d). The fifth port (120a) is connected to the second connecting pipe (117), and the sixth port (120b) is connected to the first connecting pipe (116). The temperature control system also includes a reservoir (115) and a third connecting pipe (119). The third connecting pipe (119) connects the seventh port (120c) and the eighth port (120d). The reservoir (115) and the expansion valve (101) are both located in the third connecting pipe (119). The reservoir (115) is located on the inlet side of the expansion valve (101). The lower end of the reservoir (115) along the direction of gravity is connected to the inlet of the expansion valve (101).

8. The temperature control system according to claim 6, characterized in that, The temperature control system also includes: A throttling device (110) is provided, wherein the high-pressure side recovery valve (106) and the throttling device (110) are connected in series between the high-pressure side pipeline (102) and the inlet of the vacuum pump (104); The third multi-way valve group (121) has a ninth port (121a), a tenth port (121b), and an eleventh port (121c). The outlet of the high-pressure side recovery valve (106) and the outlet of the low-pressure side recovery valve (107) are both connected to the ninth port (121a). The tenth port (121b) is connected to the inlet of the throttling device (110). The outlet of the throttling device (110) and the eleventh port (121c) are both connected to the inlet of the vacuum pump (104).

9. A method for controlling heat exchange medium leakage and suction, applied to the temperature control system according to any one of claims 1 to 8, characterized in that, include: Determine whether the temperature control system has leaked, and determine the location of the leak in the temperature control system; In the case of leakage only in the low-pressure side pipeline (103), shut down the compressor (100) and expansion valve (101), open the low-pressure side recovery valve (107), start the vacuum pump (104), pump the heat exchange medium in the low-pressure side pipeline (103) and deliver it to the vacuum tank (105). After the heat exchange medium in the low-pressure side pipeline (103) is pumped out, close the low-pressure side recovery valve (107). In the case of leakage only in the high-pressure side pipeline (102), the compressor (100) and the expansion valve (101) are shut down, the high-pressure side recovery valve (106) is opened, the vacuum pump (104) is started, the heat exchange medium in the high-pressure side pipeline (102) is drawn and delivered to the vacuum tank (105), and after the heat exchange medium in the high-pressure side pipeline (102) is drawn down, the high-pressure side recovery valve (106) is closed after a first preset time. When both the low-pressure side pipeline (103) and the high-pressure side pipeline (102) are leaking, shut down the compressor (100) and the expansion valve (101), open the high-pressure side recovery valve (106) and the low-pressure side recovery valve (107), start the vacuum pump (104), pump the heat exchange medium in the high-pressure side pipeline (102) and the low-pressure side pipeline (103) and deliver it to the vacuum tank (105). After the heat exchange medium in the high-pressure side pipeline (102) and the low-pressure side pipeline (103) is pumped out, shut down the vacuum pump (104).

10. The heat exchange medium leakage suction control method according to claim 9, characterized in that, Determining the location of the leak in the temperature control system includes: Obtain the pressure detection value of the high-pressure side pipeline (102) and the pressure detection value of the low-pressure side pipeline (103); If the pressure detection value of the low-pressure side pipeline (103) is lower than the first preset pressure, and the pressure drop rate of the low-pressure side pipeline (103) is greater than the preset rate, and the pressure drop rate of the high-pressure side pipeline (102) is less than the preset rate, it is determined that only the low-pressure side pipeline (103) is leaking. If the pressure detection value of the high-pressure side pipeline (102) is lower than the second preset pressure, and the pressure drop rate of the high-pressure side pipeline (102) is greater than the preset rate, and the pressure drop rate of the low-pressure side pipeline (103) is less than the preset rate, it is determined that only the high-pressure side pipeline (102) is leaking. If the pressure detection value of the low-pressure side pipeline (103) is lower than the first preset pressure, and the pressure detection value of the high-pressure side pipeline (102) is lower than the second preset pressure, and the pressure drop rate of the high-pressure side pipeline (102) is greater than the preset rate, and the pressure drop rate of the low-pressure side pipeline (103) is greater than the preset rate, then it is determined that both the low-pressure side pipeline (103) and the high-pressure side pipeline (102) are leaking.

11. The heat exchange medium leakage suction control method according to claim 9, characterized in that, When only the low-pressure side pipeline (103) leaks, the operating power of the vacuum pump (104) is P1; when only the high-pressure side pipeline (102) leaks, the operating power of the vacuum pump (104) is P2; and when both the low-pressure side pipeline (103) and the high-pressure side pipeline (102) leak, the operating power of the vacuum pump (104) is P3, satisfying the condition: P3 > P2 > P1.

12. The heat exchange medium leakage suction control method according to claim 9, characterized in that, The determination of whether the temperature control system has leaked includes: The pressure detection values ​​of the high-pressure side pipeline (102), the low-pressure side pipeline (103), and the heat exchange medium concentration value of the space where the temperature control system is located are obtained. If at least one of the following conditions is met, it is determined that the temperature control system has leaked, and the conditions include: The pressure detection value of the low-pressure side pipeline (103) is lower than the first preset pressure; The pressure detection value of the high-pressure side pipeline (102) is lower than the second preset pressure; The concentration of the heat exchange medium in the space where the temperature control system is located is higher than the preset concentration value.

13. The heat exchange medium leakage suction control method according to claim 9, characterized in that, Determining that the heat exchange medium in the low-pressure side pipeline (103) and / or the high-pressure side pipeline (102) has been completely drawn off includes: If the pressure in the low-pressure side pipeline (103) and / or the high-pressure side pipeline (102) is lower than a preset pressure threshold, or if the operating time of the vacuum pump (104) reaches a second preset duration, it is determined that the heat exchange medium in the low-pressure side pipeline (103) and / or the high-pressure side pipeline (102) has been successfully pumped.

14. The heat exchange medium leakage suction control method according to claim 9, characterized in that, In the case where only the low-pressure side pipeline (103) leaks, after closing the low-pressure side recovery valve (107), the following steps are also included: Open the high-pressure side recovery valve (106), suck the heat exchange medium in the high-pressure side pipeline (102) and transport it to the vacuum tank (105). After the heat exchange medium in the high-pressure side pipeline (102) is sucked out, turn off the vacuum pump (104).

15. The heat exchange medium leakage suction control method according to claim 9, characterized in that, In the case where only the high-pressure side pipeline (102) leaks, after closing the high-pressure side recovery valve (106) after a first preset time delay, the following further steps are taken: Open the low-pressure side recovery valve (107), suck up the heat exchange medium in the low-pressure side pipeline (103) and transport it to the vacuum tank (105). After the heat exchange medium in the low-pressure side pipeline (103) is sucked up, turn off the vacuum pump (104).

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