Refrigeration system

Abstract

This application relates to a refrigeration system, comprising: a first compressor, a first condenser, a throttling mechanism, and a load evaporator, wherein the first compressor, the first condenser, the first throttling valve, and the load evaporator are sequentially connected to form a first circulation loop; a first gas-liquid separator, wherein the output end of the first condenser is connected to a first inlet, and the input end of the first throttling valve is connected to a first drain port; a second gas-liquid separator, wherein a first exhaust port is controllably connected or disconnected from a second inlet via a first pipeline, and a second drain port is controllably connected or disconnected from a second pipeline located between the first drain port and the input end of the load evaporator, wherein refrigerant flowing out through the second drain port expands and depressurizes through the throttling mechanism; a first heat exchanger and a cooling mechanism, wherein the first pipeline and the cooling mechanism are thermally coupled through the first heat exchanger, and the cooling mechanism is used to cool the gas in the first pipeline; and a gas collecting device controllably connected or disconnected from the second exhaust port, wherein the gas collecting device is controllably connected or disconnected from the outside.

Description

Technical Field

[0001] This application relates to the field of temperature control technology, and in particular to a refrigeration system. Background Technology

[0002] Non-condensable gases include oxygen, nitrogen, carbon dioxide, and hydrocarbons, which cannot be condensed into liquids under specific temperatures and pressures in a condenser and always remain in a gaseous state. Non-condensable gases easily enter refrigeration systems, causing increases in condensing pressure, exhaust temperature, and exhaust pressure, thus affecting the compressor's lifespan and increasing its energy consumption.

[0003] In traditional technology, when non-condensable gases are present in a refrigeration system, they are often manually removed from the system along with the refrigerant to eliminate the non-condensable gases. This method, however, results in the waste of refrigerant because both are removed together. Utility Model Content

[0004] Therefore, it is necessary to address the problem of refrigerant waste caused by the discharge of refrigerant along with non-condensable gases in traditional technologies, and to provide a refrigeration system that facilitates the discharge of non-condensable gases and reduces refrigerant waste.

[0005] A refrigeration system, comprising:

[0006] The system comprises a first compressor, a first condenser, a throttling mechanism, and a load evaporator. The throttling mechanism includes a first throttling valve. The first compressor, the first condenser, the first throttling valve, and the load evaporator are sequentially connected to form a first circulation loop.

[0007] The first gas-liquid separator has a first inlet, a first exhaust port and a first drain port, the output end of the first condenser is connected to the first inlet, and the input end of the first throttle valve is connected to the first drain port.

[0008] The second gas-liquid separator has a second inlet, a second exhaust port and a second liquid outlet. The first exhaust port is controllably connected to or disconnected from the second inlet through a first pipeline. The second liquid outlet is controllably connected to or disconnected from a second pipeline located between the first liquid outlet and the input end of the load evaporator. The refrigerant flowing out through the second liquid outlet expands and reduces pressure through the throttling mechanism.

[0009] A first heat exchanger and a cooling mechanism, wherein the first pipeline is thermally coupled to the cooling mechanism through the first heat exchanger, and the cooling mechanism is used to cool the gas in the first pipeline;

[0010] A gas collecting device that is controllably connected to or disconnected from the second exhaust port, the gas collecting device being controllably connected to or disconnected from the outside.

[0011] In the aforementioned refrigeration system, when non-condensable gases are present, the system is controlled to enter a non-condensable gas venting state. The refrigerant undergoes initial condensation in the first condenser. After initial condensation, the refrigerant enters the first gas-liquid separator for initial gas-liquid separation. The gas after initial separation enters the first heat exchanger for secondary condensation. The refrigerant after secondary condensation then enters the second gas-liquid separator for secondary gas-liquid separation. Each time the refrigerant condenses, it passes through a gas-liquid separator, ensuring effective condensation while facilitating the separation and collection of non-condensable gases into a gas collection device. Finally, the collected non-condensable gases are discharged. Since the gas collected in the gas collection device is predominantly non-condensable, unlike existing technologies where the entire system's refrigerant is discharged to remove non-condensable gases, refrigerant waste is avoided.

[0012] In one embodiment, the first circulation loop includes a third pipe located between the output of the first throttle valve and the input of the load evaporator, the third pipe serving as the cooling mechanism.

[0013] In one embodiment, the refrigeration system further includes a second compressor, a second condenser, a second expansion valve, and the first condenser, which are connected in sequence to form a second circulation loop;

[0014] The first circulation loop and the second circulation loop are thermally coupled through the first condenser;

[0015] The second circulation loop includes a fourth pipe located between the output end of the second throttle valve and the input end of the first condenser, the fourth pipe serving as the cooling mechanism.

[0016] In one embodiment, a first control valve is provided on the first pipeline, which is used to control the opening and closing of the first pipeline.

[0017] In one embodiment, the refrigeration system further includes a fifth pipeline, the two ends of which are respectively connected to the second pipeline and the second drain port;

[0018] The throttling mechanism further includes a third throttling valve, which is located on the fifth pipeline, and the refrigerant in the fifth pipeline expands and reduces pressure through the third throttling valve;

[0019] or,

[0020] The fifth pipeline is equipped with a second control valve, which is used to control the opening and closing of the fifth pipeline. The refrigerant in the fifth pipeline expands and reduces pressure through the first throttling valve.

[0021] In one embodiment, the refrigeration system further includes a sixth pipeline, the two ends of which are respectively connected to the second exhaust port and the gas collection device;

[0022] The refrigeration system also includes a third control valve, which is located on the sixth pipeline to control the on / off state of the sixth pipeline.

[0023] In one embodiment, the refrigeration system further includes a sixth pipeline, the two ends of which are respectively connected to the second exhaust port and the gas collection device;

[0024] The refrigeration system further includes a second heat exchanger, and the first circulation loop includes a seventh pipeline located between the output end of the first compressor and the input end of the first condenser, and the sixth pipeline and the seventh pipeline are thermally coupled through the second heat exchanger.

[0025] In one embodiment, the sixth pipeline is provided with a shut-off valve, one port of which is configured to communicate with a vacuum pump to extract gas from the gas collection device.

[0026] In one embodiment, the gas collection device is equipped with a fourth control valve, which is used to control the connection between the gas collection device and the outside world.

[0027] In one embodiment, the gas collection device is equipped with a one-way valve that allows gas in the gas collection device to flow to the outside.

[0028] In one embodiment, the refrigeration system further includes a first temperature sensor for detecting the temperature of the gas in the gas collection device;

[0029] and / or

[0030] The refrigeration system also includes a first pressure sensor, which is used to detect the pressure of the gas in the gas collection device.

[0031] In one embodiment, the refrigeration system further includes a second temperature sensor and a second pressure sensor, the second temperature sensor being used to detect the suction temperature of the first compressor, and the second pressure sensor being used to detect the suction pressure of the first compressor.

[0032] The refrigeration system further includes a third temperature sensor and a third pressure sensor. The third temperature sensor is used to detect the exhaust temperature of the first compressor, and the third pressure sensor is used to detect the exhaust temperature of the first compressor.

[0033] and / or

[0034] The refrigeration system also includes a fourth temperature sensor, which is used to detect the temperature of the refrigerant flowing to the input end of the load evaporator. Attached Figure Description

[0035] Figure 1 This is a structural diagram of a refrigeration system provided in one embodiment of this application;

[0036] Figure 2 A structural diagram of a refrigeration system provided in another embodiment of this application;

[0037] Figure 3 A flowchart illustrating a control method for a refrigeration system provided in an embodiment of this application;

[0038] Figure 4 A flowchart of a control method for a refrigeration system provided in another embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100. Refrigeration system; 10. First compressor; 20. First condenser; 31. First throttle valve; 32. Third throttle valve; 40. Loaded evaporator; 50. First gas-liquid separator; 51. First inlet; 52. First exhaust port; 53. First drain port; 60. Second gas-liquid separator; 61. Second inlet; 62. Second exhaust port; 63. Second drain port; 70. First pipeline; 80. Second pipeline; 90. First heat exchanger; 110. Gas collection device; 120. Second temperature sensor; 130. Second pressure sensor; 140. Third temperature sensor; 150. Third pressure sensor; 160. 170. Fourth temperature sensor; 180. Third pipeline; 190. Second compressor; 1110. Second condenser; 1120. Second throttle valve; 1130. Fourth pipeline; 1140. First control valve; 1150. Sixth pipeline; 1160. Third control valve; 1170. Second heat exchanger; 1180. Shut-off valve; 1190. Fourth control valve; 1210. Check valve; 1220. First temperature sensor; 1230. First pressure sensor; 1240. First dryer filter; 1250. Second dryer filter; 1260. Seventh pipeline; 1270. Second control valve. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] See Figure 1 and Figure 2 One embodiment of this application provides a refrigeration system 100, including a first compressor 10, a first condenser 20, a throttling mechanism, and a load evaporator 40. The throttling mechanism includes a first throttling valve 31, and the first compressor 10, the first condenser 20, the first throttling valve 31, and the load evaporator 40 are sequentially connected to form a first circulation loop. The refrigerant can circulate among the first compressor 10, the first condenser 20, the first throttling valve 31, and the load evaporator 40. When the refrigerant flows through the load evaporator 40, it can exchange heat with electronic components for temperature control of the electronic components.

[0048] In some specific embodiments, the electronic component is a chip. It is conceivable that in other embodiments, the type of electronic component is not limited.

[0049] The refrigeration system 100 includes a first gas-liquid separator 50, which has a first inlet 51, a first exhaust port 52, and a first drain port 53. The output end of the first condenser 20 is connected to the first inlet 51, and the input end of the first throttling valve 31 is connected to the first drain port 53. The refrigeration system 100 also includes a second gas-liquid separator 60, which has a second inlet 61, a second exhaust port 62, and a second drain port 63. The first exhaust port 52 is controllably connected to or disconnected from the second inlet 61 via a first pipe 70. The second drain port 63 is controllably connected to or disconnected from a second pipe 80 located between the first drain port 53 and the input end of the load evaporator 40. The refrigerant flowing out through the second drain port 63 expands and depressurizes through a throttling mechanism.

[0050] Furthermore, the refrigeration system 100 also includes a first heat exchanger 90, a cooling mechanism, and a gas collecting device 110. The first pipeline 70 is thermally coupled to the cooling mechanism through the first heat exchanger 90, and the cooling mechanism is used to cool the gas in the first pipeline 70. The gas collecting device 110 can be controllably connected to or disconnected from the second exhaust port 62, and the gas collecting device 110 can be controllably connected to or disconnected from the outside environment.

[0051] When there are no non-condensable gases in the refrigeration system 100, the refrigeration system 100 is in normal operation (operation without discharging non-condensable gases). The first exhaust port 52 is disconnected from the second inlet 61, the second liquid outlet 63 is disconnected from the second pipeline 80, and the second exhaust port 62 is disconnected from the gas collection device 110. At this time, the refrigerant flows through the first compressor 10, the first condenser 20, the first gas-liquid separator 50, and the first throttle valve 31 to the load evaporator 40. After exchanging heat with the electronic components in the load evaporator 40, it flows back to the first compressor 10, completing one cycle. This cycle repeats continuously.

[0052] When non-condensable gases are detected in the refrigeration system 100, the refrigeration system 100 enters a non-condensable gas venting state. The first exhaust port 52 is connected to the second inlet 61, the second liquid outlet 63 is connected to the second pipeline 80, and the second exhaust port 62 is connected to the gas collection device 110. At this time, the gaseous refrigerant discharged from the first compressor 10 is condensed once by the first condenser 20 (due to the heat transfer performance of the first condenser 20, the refrigerant may or may not be completely condensed into a liquid state in the first condenser 20). The medium after condensation by the first condenser 20 (containing liquid and gaseous refrigerant and non-condensable gases that cannot be compressed and cooled) is separated in the first gas-liquid separator 50. Due to gravity, the liquid refrigerant enters the first throttling valve 31 for throttling and pressure reduction, and the mixture of gaseous refrigerant and non-condensable gases flows into the first pipeline 70. The first pipeline 70 is thermally coupled to the cooling mechanism through the first heat exchanger 90, and the cooling mechanism cools the gas in the first pipeline 70. Under the cooling effect of the cooling mechanism, the gaseous refrigerant undergoes secondary condensation, resulting in relatively thorough condensation. The liquid refrigerant formed after secondary condensation flows under gravity through the second gas-liquid separator 60 into the second pipeline 80 to participate in the main circulation. Non-condensable gases, after being separated by the second gas-liquid separator 60, enter the gas collection device 110 for storage. When the gas collection device 110 is connected to the outside, the non-condensable gases are discharged to the outside.

[0053] The refrigeration system 100 provided in this embodiment, when containing non-condensable gases, controls the refrigeration system 100 to enter a non-condensable gas venting state. The refrigerant undergoes a first condensation in the first condenser 20, followed by a first gas-liquid separator 50 for a first gas-liquid separation. The gas after the first gas-liquid separation then enters the first heat exchanger 90 for a second condensation, and finally, the refrigerant enters the second gas-liquid separator 60 for a second gas-liquid separation. Each time the refrigerant condenses, it passes through a gas-liquid separator, ensuring effective condensation while easily separating and collecting non-condensable gases into a gas collection device 110. Finally, the non-condensable gases collected in the gas collection device 110 are discharged. Since the gas collected in the gas collection device 110 is predominantly non-condensable, unlike in existing technologies where the entire system's refrigerant is discharged to remove non-condensable gases, refrigerant waste is avoided.

[0054] It should be noted that in existing technologies, when vacuuming is used to expel the refrigerant and non-condensable gases together, the lubricating oil in the system is also extracted. This makes it impossible to determine the amount of oil remaining in the system. When the lubricating oil content is low, it causes wear on components during compressor compression. When the lubricating oil content is high, the refrigerant dissolves in the oil, and an oil film forms in the system, affecting heat transfer and leading to a decrease in the cooling capacity of the refrigeration system 100. However, the refrigeration system 100 provided in this application does not require vacuuming or venting the entire refrigeration system 100, ensuring a constant level of lubricating oil in the compressor, thereby reducing compressor wear while maintaining the cooling capacity of the refrigeration system 100.

[0055] In some embodiments, see further reference. Figure 1 and Figure 2 The refrigeration system 100 includes a second temperature sensor 120 and a second pressure sensor 130. The second temperature sensor 120 is used to detect the suction temperature of the first compressor 10, and the second pressure sensor 130 is used to detect the suction pressure of the first compressor 10. The refrigeration system 100 also includes a third temperature sensor 140 and a third pressure sensor 150. The third temperature sensor 140 is used to detect the discharge pressure of the first compressor 10, and the third pressure sensor 150 is used to detect the discharge pressure of the first compressor 10.

[0056] Since the second temperature sensor 120 and the second pressure sensor 130 can detect the suction temperature and suction pressure of the first compressor 10, respectively, and the third temperature sensor 140 and the third pressure sensor 150 can detect the discharge temperature and discharge pressure of the first compressor 10, it is possible to determine whether the refrigeration system 100 contains non-condensable gases based on the suction temperature, suction pressure, discharge temperature, and discharge pressure, thereby facilitating the control of the operating status of the refrigeration system 100. Compared with the prior art method of manually identifying the presence of non-condensable gases in the system, this reduces the occurrence of misjudgments.

[0057] Further reading Figure 2 The refrigeration system 100 also includes a fourth temperature sensor 160, which is used to detect the temperature of the refrigerant flowing to the input end of the load evaporator 40. Based on the temperature of the refrigerant flowing to the input end of the load evaporator 40, it can also be determined whether the refrigeration system 100 contains non-condensable gases, which also facilitates the control of the operating status of the refrigeration system 100.

[0058] In some embodiments, see further reference. Figure 1 The first circulation loop includes a third pipe 170 located between the output end of the first throttle valve 31 and the input end of the load evaporator 40, and the third pipe 170 serves as a cooling mechanism. The third pipe 170 is either the same pipe as the second pipe 80, or the third pipe 170 is part of the second pipe 80.

[0059] In the above configuration, when the refrigeration system 100 is in normal operation, there is no actual heat exchange as the refrigerant flows through the first heat exchanger 90. When the refrigeration system 100 is in a non-condensable gas venting state, the mixture of gaseous refrigerant and non-condensable gas in the first pipe 70 exchanges heat with the refrigerant in the third pipe 170 in the first heat exchanger 90. The mixture of gaseous refrigerant and non-condensable gas transfers heat to the low-temperature refrigerant in the third pipe 170, achieving secondary condensation. By using the third pipe 170 as a cooling mechanism, the structural configuration of the refrigeration system 100 can be simplified.

[0060] In other embodiments, see further description. Figure 2 The refrigeration system 100 also includes a second compressor 180, a second condenser 190, and a second throttle valve 1110. The second compressor 180, second condenser 190, second throttle valve 1110, and first condenser 20 are sequentially connected to form a second circulation loop. The first circulation loop and the second circulation loop are thermally coupled through the first condenser 20. The refrigerant circulates among the second compressor 180, second condenser 190, second throttle valve 1110, and first condenser 20. When the refrigerant flows through the first condenser 20, it exchanges heat with the refrigerant in the first circulation loop, thereby condensing the refrigerant in the first circulation loop. Therefore, the first condenser 20 is both the evaporator of the second circulation loop and the condenser of the first circulation loop; the first condenser 20 is also called an evaporator-condenser. The second circulation loop is a high-temperature stage circulation loop, and the first circulation loop is a low-temperature stage circulation loop.

[0061] It should be noted that regardless of whether the refrigeration system 100 is in normal operation or in a non-condensable gas venting state, the second circulation loop can be in operation to condense the refrigerant in the first circulation loop. Generally, the second compressor 180 starts first, the second circulation loop operates, and after the second compressor 180 has been running normally for a certain period of time, the first compressor 10 starts then.

[0062] Furthermore, the second circulation loop includes a fourth pipe 1120 located between the output end of the second throttle valve 1110 and the input end of the first condenser 20, which serves as a cooling mechanism. When the refrigeration system 100 is in normal operation, there is no actual heat exchange as the refrigerant flows through the first heat exchanger 90. When the refrigeration system 100 is in a non-condensable gas venting state, the mixture of gaseous refrigerant and non-condensable gas in the first pipe 70 exchanges heat with the refrigerant in the fourth pipe 1120 in the first heat exchanger 90. The mixture of gaseous refrigerant and non-condensable gas transfers heat to the low-temperature refrigerant in the fourth pipe 1120, achieving secondary condensation. By using the fourth pipe 1120 as a cooling mechanism, the structural configuration of the refrigeration system 100 can also be simplified.

[0063] In some embodiments, see further reference. Figure 1 and Figure 2 A first control valve 1130 is provided on the first pipeline 70, which is used to control the opening and closing of the first pipeline 70. Since the first control valve 1130 can control the opening and closing of the first pipeline 70, it is equivalent to controlling the opening and closing between the first exhaust port 52 and the second inlet 61, so that the refrigeration system 100 can switch between normal operation and non-condensable gas venting. Optionally, the first control valve 1130 is a solenoid valve.

[0064] Furthermore, the refrigeration system 100 also includes a fifth pipe 1140, the two ends of which are connected to the second pipe 80 and the second drain port 63, respectively. The throttling mechanism also includes a third throttling valve 32, which is located on the fifth pipe 1140. The refrigerant in the fifth pipe 1140 expands and decreases in pressure through the third throttling valve 32. By setting up the fifth pipe 1140, it is convenient to connect the second pipe 80 and the second drain port 63. At the same time, the third throttling valve 32 is not only used for the expansion and pressure reduction of the refrigerant in the fifth pipe 1140, but also to control the opening and closing of the fifth pipe 1140 (when the opening of the third throttling valve 32 is 0, the fifth pipe 1140 is disconnected). It also has the effect of controlling the switching of the refrigeration system 100 between the normal operating state and the non-condensable gas venting state.

[0065] Specifically, the first throttle valve 31, the second throttle valve 1110, and the third throttle valve 32 mentioned above are all electronic expansion valves.

[0066] It is conceivable that in some other embodiments, the throttling mechanism may omit the third throttling valve 32. In this case, the refrigerant in the fifth pipe 1140 flows into the second pipe 80, expands and decreases in pressure through the first throttling valve 31, and then flows to the load evaporator 40. Furthermore, a second control valve 1270 is provided on the fifth pipe 1140. The second control valve 1270 controls the opening and closing of the fifth pipe 1140; that is, the second control valve 1270 can control the opening and closing of the second pipe 80 and the second drain port 63. Optionally, the second control valve 1270 is a solenoid valve.

[0067] In some embodiments, see further reference. Figure 1 and Figure 2 The refrigeration system 100 also includes a sixth pipe 1150, with its two ends connected to the second exhaust port 62 and the gas collecting device 110, respectively. The refrigeration system 100 also includes a third control valve 1160, which is located on the sixth pipe 1150 to control the on / off state of the sixth pipe 1150. By providing the sixth pipe 1150 to connect the second exhaust port 62 and the gas collecting device 110, and since the third control valve 1160 can control the on / off state of the sixth pipe 1150, it is equivalent to the third control valve 1160 being able to control the on / off state between the second exhaust port 62 and the gas collecting device 110, thus allowing the refrigeration system 100 to switch between normal operating conditions and non-condensable gas venting conditions. Optionally, the third control valve 1160 is a solenoid valve.

[0068] Further reading Figure 2 The refrigeration system 100 also includes a second heat exchanger 1170. The second circulation loop includes a seventh pipe 1260 located between the output end of the first compressor 10 and the input end of the first condenser 20. The sixth pipe 1150 and the seventh pipe 1260 are thermally coupled through the second heat exchanger 1170. With this configuration, on the one hand, the non-condensable gas flowing through the sixth pipe 1150 pre-cools the refrigerant compressed by the first compressor 10, thereby improving the system's energy efficiency; on the other hand, the non-condensable gas heats up after heat exchange, and its pressure increases, making it easier to release from the gas collection device 110.

[0069] Furthermore, a shut-off valve 1180 is installed on the sixth pipeline 1150. One port of the shut-off valve 1180 is configured to connect to a vacuum pump to extract gas from the gas collecting device 110. Specifically, the shut-off valve 1180 is located between the third control valve 1160 and the gas collecting device 110. When the third control valve 1160 is closed, the connection between the gas collecting device 110 and the second exhaust port 62 is cut off. If the content of non-condensable gas in the gas collecting device 110 is low, the port of the shut-off valve 1180 is connected to the vacuum pump, and the vacuum pump extracts the non-condensable gas from the gas collecting device 110 by evacuation.

[0070] In some embodiments, see further reference. Figure 1 and Figure 2 A fourth control valve 1190 is installed on the gas collection device 110, which controls the connection between the gas collection device 110 and the outside environment. When a large amount of non-condensable gas is collected in the gas collection device 110, the fourth control valve 1190 is controlled to connect the gas collection device 110 to the outside environment for exhaust. It should be noted that during the exhaust process of the gas collection device 110, the third control valve 1160 is in the closed state to prevent refrigerant from being discharged to the outside environment through the gas collection device 110. Specifically, the fourth control valve 1190 is also a solenoid valve.

[0071] Furthermore, a one-way valve 1210 is installed on the gas collecting device 110, which allows gas in the gas collecting device 110 to flow to the outside. By setting the one-way valve 1210, it is possible to prevent gas from flowing back from the outside to the gas collecting device 110.

[0072] In some embodiments, see further reference. Figure 1 The refrigeration system 100 also includes a first temperature sensor 1220, which is used to detect the temperature of the gas in the gas collecting device 110. (Continue reading...) Figure 1 and Figure 2 The refrigeration system 100 also includes a first pressure sensor 1230, which is used to detect the pressure of the gas in the gas collecting device 110. When the first temperature sensor 1220 detects that the temperature of the gas in the gas collecting device 110 reaches a preset temperature and / or the first pressure sensor 1230 detects that the pressure of the gas in the gas collecting device 110 reaches a preset pressure, the third control valve 1160 can be closed and the fourth control valve 1190 can be opened to exhaust gas, thus avoiding the need for manual judgment based on experience and improving the accuracy of the judgment.

[0073] In other embodiments, see further description. Figure 1 The refrigeration system 100 also includes a first dryer filter 1240 and a second dryer filter 1250. The first dryer filter 1240 is located at the output end of the first condenser 20. The refrigerant flowing out of the first condenser 20 is dried and filtered by the first dryer filter 1240 before flowing to the first gas-liquid separator 50. The second dryer filter 1250 is located at the output end of the second condenser 190. The refrigerant flowing out of the second condenser 190 is dried and filtered by the second dryer filter 1250 before flowing to the second throttling valve 1110 for throttling.

[0074] See Figure 3 Another embodiment of this application also provides a control method for a refrigeration system, including the following steps:

[0075] S110: Determine whether the suction temperature and suction pressure of the first compressor 10 are within the first temperature range and the first pressure range, respectively.

[0076] The suction temperature of the first compressor 10 is obtained through the second temperature sensor 120, and the suction pressure of the first compressor 10 is obtained through the second pressure sensor 130. When the suction temperature of the first compressor 10 is within the first temperature range and the suction pressure of the first compressor 10 is within the first pressure range, it proves that the refrigeration system 100 is functioning normally and operating stably. Conversely, if the suction temperature of the first compressor 10 is outside the first temperature range, or the suction pressure of the first compressor 10 is outside the first pressure range, the refrigeration system 100 is malfunctioning and needs to be rectified before proceeding with further steps.

[0077] It should be noted that the first temperature range and the first pressure range are selected as needed, and vary depending on the structure of the refrigeration system 100; no specific limitation is made here. Specifically, the first temperature range can be set as (T1, T2), and the first pressure range as (P1, P2).

[0078] S120: If the intake temperature is within the first temperature range and the intake pressure is within the first pressure range, determine whether the exhaust temperature and exhaust pressure of the first compressor 10 are within the second temperature range and the second pressure range, respectively.

[0079] The exhaust temperature of the first compressor 10 is obtained through the third temperature sensor 140, and the exhaust pressure of the first compressor 10 is obtained through the third pressure sensor 150.

[0080] The inventors discovered that by adding different amounts of nitrogen (used to simulate non-condensable gases) to the refrigeration system 100, a critical value exists. When the nitrogen content in the refrigeration system 100 is high, a significant increase in discharge temperature and pressure occurs. This is likely because the presence of non-condensable gases hinders the condensation process of the refrigerant and increases the system pressure. It is evident that when there are no non-condensable gases or only a small amount of non-condensable gases in the refrigeration system 100, the discharge temperature and pressure of the first compressor 10 are within the second temperature range and pressure range, respectively. However, when there are a large amount of non-condensable gases in the refrigeration system 100, both the discharge temperature and pressure of the first compressor 10 increase, causing the discharge temperature and pressure to exceed the second temperature and pressure ranges. Therefore, by determining whether the discharge temperature and pressure of the first compressor 10 are within the second temperature and pressure ranges, respectively, it can be determined whether there is a large amount of non-condensable gas in the refrigeration system 100.

[0081] It should be noted that the second temperature range and the second pressure range can also be set as needed, and are not limited here.

[0082] S130: If the exhaust temperature is greater than or equal to the first temperature limit of the second temperature range and the exhaust pressure is greater than or equal to the pressure limit of the second pressure range, the refrigerant discharged from the first exhaust port 52 of the first gas-liquid separator 50 is cooled by the cooling mechanism and then introduced into the second inlet 61 of the second gas-liquid separator 60.

[0083] Specifically, the second temperature range can be set to (T3, T4), and the second pressure range to (P3, P4). Then, when the exhaust temperature is greater than or equal to T4 and the exhaust pressure is greater than or equal to P4, it indicates that the refrigeration system 100 contains a large amount of non-condensable gas. The first exhaust port 52 of the first gas-liquid separator 50 is then connected to the second inlet 61 of the second gas-liquid separator 60 to discharge the non-condensable gas. More specifically, the first control valve 1130 is opened to connect the first exhaust port 52 of the first gas-liquid separator 50 to the second inlet 61 of the second gas-liquid separator 60.

[0084] In some specific embodiments, if the exhaust temperature is greater than or equal to the first upper temperature limit of the second temperature range and the exhaust pressure is greater than or equal to the upper pressure limit of the second pressure range, the first exhaust port 52 of the first gas-liquid separator 50 is immediately connected to the second inlet 61 of the second gas-liquid separator 60. In other specific embodiments, if the exhaust temperature is greater than or equal to the first upper temperature limit of the second temperature range and the exhaust pressure is greater than or equal to the upper pressure limit of the second pressure range, the first exhaust port 52 and the second inlet 61 can also be connected after the refrigeration system 100 continues to operate for a fourth preset time, so as to give the non-condensable gas a certain accumulation time.

[0085] The fourth preset duration can be set as needed. Optionally, the fourth preset duration is 30 seconds. Of course, in some other embodiments, the specific value of the fourth preset duration is not limited.

[0086] S140: Control the gas collection device 110 to connect with the second exhaust port 62 of the second gas-liquid separator 60 to collect non-condensable gases.

[0087] Specifically, the third control valve 1160 is opened to connect the gas collecting device 110 with the second exhaust port 62 of the second gas-liquid separator 60.

[0088] When the gas collecting device 110 is connected to the second exhaust port 62 of the second gas-liquid separator 60, the non-condensable gas formed after the first gas-liquid separation by the first gas-liquid separator 50 and the second gas-liquid separation by the second gas-liquid separator 60 enters the gas collecting device 110 and is collected.

[0089] It should be noted that when the gas collecting device 110 collects gas, the second drain port 63 of the second gas-liquid separator 60 is connected to the second pipeline 80 through the fifth pipeline 1140. At this time, the liquid separated by the second gas-liquid separator 60 flows through the fifth pipeline 1140 to the second pipeline 80, and then through the second pipeline 80 to the load evaporator 40 to participate in the temperature control of electronic components. In some embodiments, the refrigerant in the fifth pipeline 1140 expands and depressurizes through the third throttle valve 32, and the first throttle valve 31 operates at a fixed opening of n%. The third throttle valve 32 automatically adjusts its opening according to the current operating conditions to meet the temperature requirements of the load end (the load evaporator 40 is the load end). In other embodiments, the second control valve 1270 is opened, and the refrigerant in the fifth pipeline 1140 expands and depressurizes through the first throttle valve 31. The first throttle valve 31 automatically adjusts its opening to meet the temperature requirements of the load end.

[0090] The control method for the refrigeration system provided in this application embodiment determines whether the discharge temperature and discharge pressure of the first compressor 10 are within a second temperature range and a second pressure range, respectively, when the discharge temperature is greater than or equal to the upper limit of the first temperature range and the discharge pressure is greater than or equal to the upper limit of the second pressure range. When the discharge temperature is greater than or equal to the upper limit of the first temperature range and the discharge pressure is greater than or equal to the upper limit of the second pressure range, the refrigerant discharged from the first discharge port 52 of the first gas-liquid separator 50 is cooled by a cooling mechanism and then introduced into the second inlet 61 of the second gas-liquid separator 60. Furthermore, the gas collecting device 110 is connected to the second discharge port 62 of the second gas-liquid separator 60 to collect non-condensable gases. At this time, the refrigerant undergoes a first condensation in the first condenser 20. The refrigerant after the first condensation enters the first gas-liquid separator 50 for a first gas-liquid separation. The gas after the first gas-liquid separation enters the first heat exchanger 90 for a second condensation. The refrigerant after the second condensation enters the second gas-liquid separator 60 for a second gas-liquid separation. Each time the refrigerant condenses, it passes through a gas-liquid separator, ensuring the condensation effect of the refrigerant while easily separating non-condensable gases from the refrigerant and collecting them in the gas collection device 110. Since the gas collected in the gas collection device is mostly non-condensable, unlike existing technologies where the entire refrigerant in the system is discharged along with the non-condensable gases, there is no waste of refrigerant.

[0091] In some embodiments, before S110, the following step is included:

[0092] Determine whether the running time of the refrigeration system 100 is greater than or equal to the second preset time;

[0093] If the operating time of the refrigeration system 100 is greater than or equal to the second preset time, proceed to step S110.

[0094] The operating time of the refrigeration system 100 is the operating time of the refrigeration system 100 under normal operating conditions. Generally, after the refrigeration system 100 has been running for a certain period of time, it enters a stable operating state. If the operating time of the refrigeration system 100 is too short, misjudgments may occur. For example, in some cases, when the operating time of the refrigeration system 100 is insufficient, even if the performance of the refrigeration system 100 is normal, it may result in the judgment that the suction temperature of the first compressor 10 is outside the first temperature range, or the suction pressure of the first compressor 10 is outside the first pressure range.

[0095] The above settings, when the running time of the refrigeration system 100 is greater than or equal to the second preset time, execute step S110, which can reduce the occurrence of misjudgment.

[0096] It should be noted that the second preset duration can be selected as needed, and is not limited here.

[0097] In some embodiments, see Figure 4 Following S140, it also includes:

[0098] S150: Control the gas collection device 110 to disconnect from the second exhaust port 62;

[0099] Specifically, closing the third control valve 1160 disconnects the gas collecting device 110 from the second exhaust port 62 of the second gas-liquid separator 60. At this time, the non-condensable gas is stored in the gas collecting device 110.

[0100] Furthermore, the S150 also includes:

[0101] The first exhaust port 52 of the first gas-liquid separator 50 is disconnected from the second inlet 61 of the second gas-liquid separator 60. At this time, the refrigeration system 100 switches back to normal operation.

[0102] S160: Control the gas collection device 110 to connect with the outside for exhaust.

[0103] Specifically, the fourth control valve 1190 is opened to connect the gas collection device 110 to the outside for exhaust. At this time, the non-condensable gas stored in the gas collection device 110 is discharged to the outside so that it can be collected again next time.

[0104] Furthermore, following the S160, it also includes:

[0105] The control gas collection device 110 is disconnected from the outside environment;

[0106] Return to step S110.

[0107] Specifically, after the control gas collection device 110 is disconnected from the outside, the step of determining whether the running time of the refrigeration system 100 is greater than or equal to the second preset time is executed first. If the running time of the refrigeration system 100 is greater than or equal to the second preset time, then step S110 is executed.

[0108] By returning to step S110, it is determined again whether the suction temperature and suction pressure of the first compressor 10 are within the first temperature range and the first pressure range, respectively. This cycle is repeated to avoid the presence of a large amount of non-condensable gas in the refrigeration system 100.

[0109] In some embodiments, before S150, the following steps are also included:

[0110] Determine whether the connection time between the gas collection device 110 and the second exhaust port 62 is greater than or equal to the first preset time.

[0111] If the connection duration is greater than or equal to the first preset duration, the control gas collection device 110 is disconnected from the second exhaust port 62.

[0112] When the connection time between the gas collecting device 110 and the second exhaust port 62 is short, less non-condensable gas enters the gas collecting device 110. When less non-condensable gas is collected in the gas collecting device 110, the pressure in the gas collecting device 110 is low. If the pressure is lower than the external atmospheric pressure or only slightly higher than the external atmospheric pressure when the fourth control valve 1190 is opened for exhaust, the gas collected in the gas collecting device 110 cannot be discharged to the outside, and the non-condensable gas needs to be collected again, which will prolong the collection time and is not conducive to the stable operation of the system.

[0113] It is evident that by setting the connection time to be greater than or equal to the first preset time before disconnecting the gas collection device 110 from the second exhaust port 62, it is possible to ensure that enough non-condensable gas is collected in the gas collection device 110, avoid frequent valve opening and closing, shorten the collection time, and facilitate the stable operation of the system.

[0114] The first preset duration is set as needed and is not specifically limited here. Generally, the first preset duration is greater than or equal to the number of cycles of the refrigeration system 100, which is sufficient to separate the non-condensable gases in the system, unless the content of non-condensable gases in the refrigeration system 100 is too high and requires multiple collections.

[0115] In some embodiments, the gas collected in the gas collecting device 110 is the gas after heat exchange with the refrigerant at the exhaust end of the first compressor 10. Optionally, the gas in the sixth pipeline 1150 and the gas in the seventh pipeline 1260 exchange heat in the second heat exchanger 1170 before entering the gas collecting device 110. After S150, the following step is further included:

[0116] Determine whether the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure.

[0117] The first pressure is greater than atmospheric pressure. In some specific embodiments, the first pressure is 3 atmospheres. The pressure of the gas in the gas collecting device 110 is detected by the first pressure sensor 1230.

[0118] If the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure, proceed to step S160.

[0119] When the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure, the gas in the gas collecting device 110 can be quickly discharged from the gas collecting device 110 under the action of pressure difference, ensuring the exhaust effect.

[0120] Furthermore, if the pressure of the gas in the gas collecting device 110 is less than the first pressure, the valve port of the control shut-off valve 1180 is connected to the vacuum pumping equipment to vent the gas in the gas collecting device 110.

[0121] When the pressure of the gas in the gas collecting device 110 is less than the first pressure, it proves that there is less non-condensable gas in the gas collecting device 110. It will not be able to be automatically discharged from the gas collecting device 110 under the action of pressure difference. The vacuum equipment can extract the gas remaining in the gas collecting device 110 to ensure that there is no gas residue in the gas collecting device 110.

[0122] It should be noted that when the vacuum equipment extracts gas from the gas collection device 110, the third control valve 1160 is in the closed state and will not affect the operation of the refrigeration system 100.

[0123] In other embodiments, the gas collected by the gas collecting device 110 is gas that has not exchanged heat with the refrigerant at the exhaust end of the first compressor 10. In this case, the gas discharged from the second exhaust port 62 of the second gas-liquid separator 60 directly enters the gas collecting device 110 via the sixth pipeline 1150. After S150, the following step is also included:

[0124] Determine whether the temperature of the gas above the gas collecting device 110 is greater than the first temperature;

[0125] Based on the density properties of gaseous refrigerant and non-condensable gas, assuming that the gas collecting device 110 still contains gaseous refrigerant, since the non-condensable gas has a relatively lower density, it will occupy the space above the gas collecting device 110, while the gaseous refrigerant will mainly concentrate at the bottom. Due to their different boiling points, when the gas collected by the gas collecting device 110 is gas that has not exchanged heat with the refrigerant at the exhaust end of the first compressor 10, the temperature of the gaseous refrigerant is much lower than the temperature of the non-condensable gas. The temperature above the gas collecting device 110 is the temperature of the non-condensable gas. Generally, the temperature of the non-condensable gas should be kept at least above 0℃, while the temperature of the gaseous refrigerant should be below 0℃. The first temperature can be set to be greater than or equal to 0℃.

[0126] Specifically, the first temperature sensor 1220 is installed above the gas collection device 110 to detect the temperature above the gas collection device 110.

[0127] If the temperature of the gas above the gas collecting device 110 is greater than the first temperature, determine whether the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure.

[0128] When the temperature of the gas above the gas collecting device 110 is greater than the first temperature, it proves that the gas collected in the gas collecting device 110 is a non-condensable gas. Then, it is determined whether the pressure of the gas in the gas collecting device 110 is greater than the first pressure to determine whether the exhaust conditions are met.

[0129] If the gas pressure in the gas collecting device 110 is greater than or equal to the first pressure, the fourth control valve 1190 is opened, and the gas collecting device 110 is connected to the outside to exhaust gas. At this time, under the action of pressure difference, the gas in the gas collecting device 110 is automatically discharged to the outside.

[0130] If the pressure of the gas in the gas collecting device 110 is less than the first pressure, control the gas collecting device 110 to connect with the second exhaust port 62 to collect non-condensable gas;

[0131] Determine whether the pressure of the gas in the gas collecting device 110 is greater than or equal to the second pressure;

[0132] If the pressure of the gas in the gas collecting device 110 is greater than or equal to the second pressure, the gas collecting device 110 is disconnected from the second exhaust port 62, and the gas collecting device 110 is connected to the outside for exhaust.

[0133] The second pressure is greater than or equal to the first pressure. Specifically, when the first pressure is 3 atmospheres, the second pressure can be 6 atmospheres.

[0134] Of course, in other embodiments, the first pressure and the second pressure can be set in other ways, which are not limited here.

[0135] When the temperature of the gas in the gas collecting device 110 is greater than the first temperature, but the gas pressure in the gas collecting device 110 is less than the first pressure, it proves that there is non-condensable gas in the gas collecting device 110, which also indirectly proves that there is non-condensable gas in the refrigeration system 100. Since the gas pressure in the gas collecting device 110 is less than the first pressure, it proves that the gas collected in the gas collecting device 110 is insufficient at this time, and it is necessary to continue collecting gas so that it can be discharged under the action of pressure difference.

[0136] In some embodiments, if the temperature of the gas above the gas collecting device 110 is lower than a first temperature, the first exhaust port 52 is disconnected from the second inlet 61. Optionally, the first control valve 1130 is closed, at which time the first exhaust port 52 is disconnected from the second inlet 61.

[0137] When the temperature of the gas above the gas collecting device 110 is lower than the first temperature, it proves that no non-condensable gas has been collected in the gas collecting device 110, indicating that the non-condensable gas in the refrigeration system 100 has been emptied. At this time, the first exhaust port 52 is disconnected from the second inlet 61, and the refrigeration system 100 switches to normal operation.

[0138] It should be noted that after the fourth control valve 1190 is opened to control the gas collection device 110 to connect with the outside and exhaust for a certain period of time, such as after opening for 1-2 seconds, it is then closed and stabilized for a certain period of time, such as after 10 seconds. The temperature and pressure in the gas collection device 110 are then checked again until the temperature in the gas above the gas collection device 110 is lower than the first temperature, and the non-condensable gas is then vented.

[0139] It should also be noted that when the gas collected in the gas collecting device 110 is the gas after heat exchange with the refrigerant at the exhaust end of the first compressor 10, since the gas exchanges heat with the refrigerant at the exhaust end of the first compressor 10 when passing through the second heat exchanger 1170, the temperature of both the gaseous refrigerant and the non-condensable gas increases after the heat exchange. Therefore, it is not possible to determine whether there is non-condensable gas in the gas collecting device 110 by temperature.

[0140] The inventors' research also revealed that by adding different amounts of nitrogen (used to simulate non-condensable gases) to the refrigeration system 100, it was found that when the nitrogen content in the refrigeration system 100 was low, the discharge temperature and pressure did not change significantly, but the outlet liquid temperature (the temperature at which the refrigerant flows to the load evaporator 40) fluctuated more noticeably. Based on a combination of experimental methods and theoretical experience, it was concluded that if the refrigeration system 100 contains trace amounts of non-condensable gases, the most obvious manifestation will be a peak fluctuation in the outlet liquid temperature, resulting in data points exceeding the accuracy standard.

[0141] In some embodiments, after S120, the following step is also included:

[0142] If the exhaust temperature is within the second temperature range and the exhaust temperature is within the second pressure range, determine whether the liquid inlet temperature of the load evaporator 40 of the refrigeration system 100 is within the third temperature range.

[0143] The fourth temperature sensor 160 acquires the inlet temperature of the load evaporator 40.

[0144] If the liquid inlet temperature is greater than the upper limit of the second temperature range of the third temperature range, the first exhaust port 52 of the first gas-liquid separator 50 and the second inlet 61 of the second gas-liquid separator 60 are connected after the refrigeration system 100 continues to run for at least a third preset time.

[0145] Perform step S140.

[0146] The third temperature range is the range of liquid inlet temperature when there is no non-condensable gas in the refrigeration system 100. The third temperature range varies adaptively depending on the operating conditions and is not limited here.

[0147] When the inlet liquid temperature is greater than the upper limit of the second temperature range of the third temperature range, it indicates that the refrigeration system 100 contains a small amount (trace amount) of non-condensable gas. After the refrigeration system 100 continues to operate for at least a third preset time, the non-condensable gas accumulates. The first exhaust port 52 of the first gas-liquid separator 50 is connected to the second inlet 61 of the second gas-liquid separator 60, and step S140 is executed to facilitate the collection of non-condensable gas.

[0148] It should be noted that the third preset duration can be selected as needed, and no specific limitation is made here.

[0149] The subsequent steps for the refrigeration system 100 to discharge a small amount of non-condensable gas are the same as those for discharging a large amount of non-condensable gas, and will not be described in detail here.

[0150] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0151] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A refrigeration system characterized by, include: The first compressor (10), the first condenser (20), the throttling mechanism and the load evaporator (40) are connected in sequence to form a first circulation loop. The throttling mechanism includes a first throttling valve (31). The first gas-liquid separator (50) has a first inlet (51), a first exhaust port (52) and a first drain port (53). The output end of the first condenser (20) is connected to the first inlet (51), and the input end of the first throttle valve (31) is connected to the first drain port (53). The second gas-liquid separator (60) has a second inlet (61), a second exhaust port (62) and a second drain port (63). The first exhaust port (52) is controllably connected to or disconnected from the second inlet (61) through a first pipeline (70). The second drain port (63) is controllably connected to or disconnected from the second pipeline (80) located between the first drain port (53) and the input end of the load evaporator (40). The refrigerant flowing out through the second drain port (63) expands and depressurizes through the throttling mechanism. The first heat exchanger (90) and the cooling mechanism are thermally coupled through the first heat exchanger (90), and the cooling mechanism is used to cool the gas in the first pipeline (70). A gas collecting device (110) that is controllably connected to or disconnected from the second exhaust port (62) is controllably connected to or disconnected from the outside.

2. The refrigeration system of claim 1, wherein, The first circulation loop includes a third pipe (170) located between the output end of the first throttle valve (31) and the input end of the load evaporator (40), the third pipe (170) serving as the cooling mechanism.

3. The refrigeration system of claim 1, wherein, The refrigeration system further includes a second compressor (180), a second condenser (190), a second throttle valve (1110), and the first condenser (20) that are connected in sequence to form a second circulation loop; The first circulation loop and the second circulation loop are thermally coupled through the first condenser (20); The second circulation loop includes a fourth pipe (1120) located between the output end of the second throttle valve (1110) and the input end of the first condenser (20), the fourth pipe (1120) serving as the cooling mechanism.

4. The refrigeration system of claim 1, wherein, The first pipeline (70) is provided with a first control valve (1130), which is used to control the opening and closing of the first pipeline (70).

5. The refrigeration system of claim 1, wherein, The refrigeration system also includes a fifth pipe (1140), the two ends of which are connected to the second pipe (80) and the second drain port (63), respectively; The throttling mechanism also includes a third throttling valve (32), which is located on the fifth pipeline (1140). The refrigerant in the fifth pipeline (1140) expands and depressurizes through the third throttling valve (32). or, The fifth pipeline (1140) is provided with a second control valve (1270), which is used to control the opening and closing of the fifth pipeline (1140). The refrigerant in the fifth pipeline (1140) expands and depressurizes through the first throttle valve (31).

6. The refrigeration system of claim 1, wherein, The refrigeration system also includes a sixth pipe (1150), the two ends of which are connected to the second exhaust port (62) and the gas collecting device (110), respectively. The refrigeration system also includes a third control valve (1160), which is located on the sixth pipeline (1150) to control the opening and closing of the sixth pipeline (1150).

7. The refrigeration system of claim 1, wherein, The refrigeration system also includes a sixth pipe (1150), the two ends of which are connected to the second exhaust port (62) and the gas collecting device (110), respectively. The refrigeration system further includes a second heat exchanger (1170), and the first circulation loop includes a seventh pipe (1260) located between the output end of the first compressor (10) and the input end of the first condenser (20), and the sixth pipe (1150) and the seventh pipe (1260) are thermally coupled through the second heat exchanger (1170).

8. The refrigeration system of claim 7, wherein, The sixth pipeline (1150) is provided with a shut-off valve (1180), one port of which is configured to be connected to a vacuum pump to extract gas from the gas collection device (110).

9. The refrigeration system of claim 1 wherein, The gas collection device (110) is equipped with a fourth control valve (1190), which is used to control the connection and disconnection between the gas collection device (110) and the outside world.

10. The refrigeration system of claim 1, wherein, The gas collecting device (110) is equipped with a one-way valve (1210), which allows the gas in the gas collecting device (110) to flow to the outside.

11. The refrigeration system of claim 1 wherein, The refrigeration system further includes a first temperature sensor (1220), which is used to detect the temperature of the gas in the gas collecting device (110); and / or The refrigeration system also includes a first pressure sensor (1230), which is used to detect the pressure of the gas in the gas collection device (110).

12. The refrigeration system of any of claims 1-11, wherein, The refrigeration system further includes a second temperature sensor (120) and a second pressure sensor (130), the second temperature sensor (120) being used to detect the suction temperature of the first compressor (10), and the second pressure sensor (130) being used to detect the suction pressure of the first compressor (10); The refrigeration system further includes a third temperature sensor (140) and a third pressure sensor (150). The third temperature sensor (140) is used to detect the exhaust temperature of the first compressor (10), and the third pressure sensor (150) is used to detect the exhaust temperature of the first compressor (10). and / or The refrigeration system further includes a fourth temperature sensor (160) for detecting the temperature of refrigerant flowing to the input side of the load evaporator (40).

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