Control method of refrigerating system

Abstract

The invention relates to a control method of a refrigerating system. The control method comprises the steps that whether the suction temperature and the suction pressure of a first compressor are in a first temperature interval and a first pressure interval or not is judged; if the suction temperature is within the first temperature interval and the suction pressure is within the first pressure interval, whether the exhaust temperature and the exhaust pressure of a first compressor are within a second temperature interval and a second pressure interval or not is judged; if the exhaust temperature is larger than or equal to the first temperature upper limit value of the second temperature interval and the exhaust pressure is larger than or equal to the pressure upper limit value of the second pressure interval, a refrigerant exhausted from a first exhaust port of a first gas-liquid separator is controlled to be introduced into a second inlet of a second gas-liquid separator through a cooling mechanism; and the gas collection device is controlled to be communicated with a second exhaust port of the second gas-liquid separator to collect the non-condensable gas.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a control method for a refrigeration system. Background Art

[0002] Non-condensable gases, such as oxygen, nitrogen, carbon dioxide, and hydrocarbons, cannot condense into liquids under the specific temperature and pressure of the condenser and remain in a gaseous state. These gases are easily introduced into the refrigeration system, causing increases in condensing pressure, exhaust temperature, and exhaust pressure, shortening the compressor's service life and increasing its energy consumption.

[0003] In traditional refrigeration systems, when non-condensable gases appear, the refrigerant and non-condensable gases are often manually discharged to remove the non-condensable gases. However, this method wastes refrigerant because both the refrigerant and non-condensable gases are discharged together. Summary of the Invention

[0004] Based on this, it is necessary to provide a control method for a refrigeration system that facilitates the discharge of non-condensable gases and can reduce refrigerant waste in order to address the problem of refrigerant waste caused by discharging the refrigerant together with the traditional technology in order to discharge the non-condensable gases.

[0005] A method for controlling a refrigeration system comprises the following steps:

[0006] determining whether the suction temperature and suction pressure of the first compressor are respectively within a first temperature range and a first pressure range;

[0007] If the suction temperature is within the first temperature range and the suction pressure is within the first pressure range, determining whether the exhaust temperature and the exhaust pressure of the first compressor are respectively within the second temperature range and the second pressure range;

[0008] If the exhaust temperature is greater than or equal to the first temperature upper limit of the second temperature range and the exhaust pressure is greater than or equal to the pressure upper limit of the second pressure range, controlling the refrigerant discharged from the first exhaust port of the first gas-liquid separator to be cooled by the cooling mechanism and then passed into the second inlet of the second gas-liquid separator;

[0009] The gas collecting device is controlled to be in communication with the second exhaust port of the second gas-liquid separator to collect non-condensable gas.

[0010] The control method of the above-mentioned refrigeration system, when the suction temperature is within the first temperature range and the suction pressure is within the first pressure range, determines whether the exhaust temperature and exhaust pressure of the first compressor are respectively within the second temperature range and the second pressure range, when the exhaust temperature is greater than or equal to the first temperature upper limit of the second temperature range and the exhaust pressure is greater than or equal to the pressure upper limit of the second pressure range, controls the refrigerant discharged from the first exhaust port of the first gas-liquid separator to be cooled by the cooling mechanism and then passed into the second inlet of the second gas-liquid separator, and controls the gas collecting device to be connected to the second exhaust port of the second gas-liquid separator to collect non-condensable gas. At this time, the refrigerant passes through the first condenser for the first condensation, and the refrigerant after the first condensation enters the first gas-liquid separator for the first gas-liquid separation. The gas after the first gas-liquid separation enters the first heat exchanger for the second condensation, and the refrigerant after the second condensation enters the second gas-liquid separator for the second gas-liquid separation. The refrigerant is separated by the gas-liquid separator each time after condensation, which ensures the condensation effect of the refrigerant while making it easy to separate the non-condensable gas from the refrigerant and collect it in the gas collecting device. Since most of the gas collected in the gas collecting device is non-condensable gas, the refrigerant in the entire system will not be discharged together in order to discharge the non-condensable gas in the system as in the prior art, which will not cause waste of refrigerant.

[0011] In one embodiment, after controlling the gas collecting device to communicate with the second exhaust port of the second gas-liquid separator to collect non-condensable gas, the method further includes the following steps:

[0012] Controlling the gas collecting device to disconnect from the second exhaust port;

[0013] Control the gas collecting device to be connected to the outside for exhaust.

[0014] In one embodiment, after controlling the gas collecting device to communicate with the outside to exhaust, the method further includes the following steps:

[0015] Control the gas collecting device to disconnect from the outside world;

[0016] Return to the above steps to determine whether the suction temperature and suction pressure of the first compressor are respectively within the first temperature range and the first pressure range.

[0017] In one embodiment, before controlling the gas collecting device to disconnect from the second exhaust port, the method further includes the following steps:

[0018] Determining whether a duration of communication between the gas collecting device and the second exhaust port is greater than or equal to a first preset duration;

[0019] If the connection time is greater than or equal to the first preset time, the gas collecting device is controlled to be disconnected from the second exhaust port.

[0020] In one embodiment, the gas collected by the gas collecting device is the gas after heat exchange with the refrigerant at the exhaust end of the first compressor;

[0021] After controlling the gas collecting device to be disconnected from the second exhaust port, the method further includes the following steps:

[0022] determining whether the pressure of the gas in the gas collecting device is greater than or equal to the first pressure;

[0023] If the pressure of the gas in the gas collecting device is greater than or equal to the first pressure, the gas collecting device is controlled to be connected to the outside to exhaust.

[0024] In one embodiment, the steps are further included:

[0025] If the pressure of the gas in the gas collecting device is lower than the first pressure, the valve port of the stop valve is controlled to be connected to the vacuum pumping device to evacuate the gas in the gas collecting device.

[0026] In one embodiment, the gas collected by the gas collecting device is gas that has not exchanged heat with the refrigerant at the exhaust end of the first compressor;

[0027] After controlling the gas collecting device to be disconnected from the second exhaust port, the method further includes the following steps:

[0028] determining whether the temperature of the gas above the gas collecting device is greater than a first temperature;

[0029] If the temperature of the gas in the gas collecting device is greater than the first temperature, determining whether the pressure of the gas in the gas collecting device is greater than or equal to the first pressure;

[0030] If the pressure of the gas in the gas collecting device is greater than or equal to the first pressure, the gas collecting device is controlled to be connected to the outside to exhaust.

[0031] In one embodiment, the steps are further included:

[0032] If the pressure of the gas in the gas collecting device is lower than the first pressure, controlling the gas collecting device to communicate with the second exhaust port to collect the non-condensable gas;

[0033] determining whether the pressure of the gas in the gas collecting device is greater than or equal to the second pressure;

[0034] If the pressure of the gas in the gas collecting device is greater than or equal to the second pressure, the gas collecting device is controlled to be disconnected from the second exhaust port, and the gas collecting device is controlled to be connected to the outside for exhaust;

[0035] Wherein, the second pressure is greater than or equal to the first pressure.

[0036] In one embodiment, the steps are further included:

[0037] If the temperature of the gas above the gas collecting device is lower than the first temperature, the first exhaust port is controlled to be disconnected from the second inlet.

[0038] In one embodiment, before determining whether the suction temperature and suction pressure of the first compressor are respectively within the first temperature range and the first pressure range, the method further includes the following steps:

[0039] Determining whether the operating time of the refrigeration system is greater than or equal to a second preset time;

[0040] If the operation time of the refrigeration system is greater than or equal to the second preset time, it is determined whether the suction temperature and the suction pressure of the first compressor are respectively within the first temperature range and the first pressure range.

[0041] In one embodiment, if the suction temperature is within the first temperature range and the suction pressure is within the first pressure range, after determining whether the exhaust temperature and the exhaust pressure of the first compressor are respectively within the second temperature range and the second pressure range, the method further includes the following steps:

[0042] If the exhaust gas temperature is within the second temperature range and the exhaust gas pressure is within the second pressure range, determining whether the liquid inlet temperature of the load evaporator of the refrigeration system is within a third temperature range;

[0043] If the liquid inlet temperature is greater than a second upper temperature limit of the third temperature range, controlling the first exhaust port of the first gas-liquid separator to be connected to the second inlet of the second gas-liquid separator after the refrigeration system continues to operate for at least a third preset time;

[0044] The step of controlling the gas collecting device to communicate with the second exhaust port of the second gas-liquid separator to collect non-condensable gas is performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A structural diagram of a refrigeration system provided in one embodiment of the present application;

[0046] Figure 2 A structural diagram of a refrigeration system provided in another embodiment of the present application;

[0047] Figure 3 A flow chart of a method for controlling a refrigeration system according to an embodiment of the present application;

[0048] Figure 4 This is a flow chart of a control method for a refrigeration system provided in another embodiment of the present application.

[0049] Description of reference numerals:

[0050] 100, Refrigeration System; 10, First Compressor; 20, First Condenser; 31, First Throttle Valve; 32, Third Throttle Valve; 40, Load Evaporator; 50, First Gas-Liquid Separator; 51, First Inlet; 52, First Exhaust Port; 53, First Liquid Drain Port; 60, Second Gas-Liquid Separator; 61, Second Inlet; 62, Second Exhaust Port; 63, Second Liquid Drain Port; 70, First Pipeline; 80, Second Pipeline; 90, First Heat Exchanger; 110, Gas Collector; 120, Second Temperature Sensor; 130, Second Pressure Sensor; 140, Third Temperature Sensor; 150, Third Pressure Sensor; 160 , fourth temperature sensor; 170, third pipeline; 180, second compressor; 190, second condenser; 1110, second throttle valve; 1120, fourth pipeline; 1130, first control valve; 1140, fifth pipeline; 1150, sixth pipeline; 1160, third control valve; 1170, second heat exchanger; 1180, stop valve; 1190, fourth control valve; 1210, one-way valve; 1220, first temperature sensor; 1230, first pressure sensor; 1240, first drying filter; 1250, second drying filter; 1260, seventh pipeline; 1270, second control valve. DETAILED DESCRIPTION

[0051] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate 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 implementation methods.

[0057] See Figure 1 and Figure 2One embodiment of the present application provides a refrigeration system 100, comprising a first compressor 10, a first condenser 20, a throttling mechanism, and a load evaporator 40. The throttling mechanism includes a first throttle valve 31. The first compressor 10, the first condenser 20, the first throttle valve 31, and the load evaporator 40 are sequentially connected to form a first circulation loop. Refrigerant can circulate between the first compressor 10, the first condenser 20, the first throttle valve 31, and the load evaporator 40. When the refrigerant flows through the load evaporator 40, it can exchange heat with electronic components to control the temperature of the electronic components.

[0058] 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.

[0059] The refrigeration system 100 includes a first gas-liquid separator 50 having 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 refrigeration system 100 also includes a second gas-liquid separator 60 having a second inlet 61, a second exhaust port 62, and a second drain port 63. The first exhaust port 52 is controllably connected or disconnected with the second inlet 61 via a first pipeline 70. The second drain port 63 is controllably connected or disconnected with a second pipeline 80 located between the first drain port 53 and the input end of the load evaporator 40. The refrigerant flowing out of the second drain port 63 is expanded and decompressed by a throttling mechanism.

[0060] 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 via 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 world.

[0061] When no non-condensable gas exists in the refrigeration system 100, the refrigeration system 100 is in a normal operating state (an operating state in which the non-condensable gas does not need to be discharged). The first exhaust port 52 is disconnected from the second inlet 61, the second liquid discharge port 63 is disconnected from the second pipeline 80, and the second exhaust port 62 is disconnected from the gas collecting 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 electronic components in the load evaporator 40, it returns to the first compressor 10, completing one cycle. This cycle repeats repeatedly.

[0062] When the presence of non-condensable gas is detected in the refrigeration system 100, the refrigeration system 100 enters a non-condensable gas exhaust state, with the first exhaust port 52 communicating with the second inlet 61, the second liquid discharge port 63 communicating with the second pipeline 80, and the second exhaust port 62 communicating with the gas collecting device 110. At this point, the gaseous refrigerant discharged from the first compressor 10 is condensed once in the first condenser 20 (depending on 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 condensed in the first condenser 20 (including liquid and gaseous refrigerants and non-condensable gas that cannot be compressed and cooled) is separated in the first gas-liquid separator 50. Due to gravity, the liquid refrigerant enters the first throttle valve 31 for throttling and pressure reduction, and the mixture of gaseous refrigerant and non-condensable gas flows into the first pipeline 70. The first pipeline 70 is thermally coupled to the cooling mechanism via the first heat exchanger 90, and the cooling mechanism cools the gas in the first pipeline 70. Under the cooling mechanism, the gaseous refrigerant undergoes secondary condensation, resulting in relatively complete condensation. The resulting liquid refrigerant flows by gravity through the lower portion of the second gas-liquid separator 60 and into the second pipeline 80, joining the main circulation. The non-condensable gases are separated by the second gas-liquid separator 60 and then stored in the gas collection device 110. When the gas collection device 110 is connected to the outside world, the non-condensable gases are discharged to the outside.

[0063] The refrigeration system 100 provided in the embodiment of the present application, when there is non-condensable gas in the system, controls the refrigeration system 100 to enter the non-condensable gas emptying state, and the refrigerant passes through the first condenser 20 for the first condensation. The refrigerant after the first condensation enters the first gas-liquid separator 50 for the first gas-liquid separation. The gas after the first gas-liquid separation enters the first heat exchanger 90 for the second condensation. The refrigerant after the second condensation enters the second gas-liquid separator 60 for the second gas-liquid separation. The refrigerant is separated by the gas-liquid separator each time after condensation, which ensures the condensation effect of the refrigerant while facilitating the separation of the non-condensable gas from the refrigerant and collecting it in the gas collecting device 110. Finally, the non-condensable gas collected by the gas collecting device 110 is discharged. Since most of the gas collected in the gas collecting device 110 is non-condensable gas, the refrigerant in the entire system will not be discharged together in order to discharge the non-condensable gas in the system as in the prior art, and no waste of refrigerant will occur.

[0064] It should be noted that in the prior art, when vacuuming the refrigerant and non-condensable gases, the lubricating oil in the system is also extracted, making it impossible to determine the amount of oil in the system. When the lubricating oil content is low, it causes wear on the compressor components during compression. When the lubricating oil content is high, the refrigerant dissolves in the oil and the system produces an oil film that affects heat transfer, resulting in a decrease in the refrigeration capacity of the refrigeration system 100. The refrigeration system 100 provided in this application does not vacuum the entire refrigeration system 100, ensuring the constancy of the lubricating oil in the compressor, thereby reducing wear on the compressor while ensuring the refrigeration capacity of the refrigeration system 100.

[0065] In some embodiments, see 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.

[0066] Since the second temperature sensor 120 and the second pressure sensor 130 can respectively detect the suction temperature and suction pressure of the first compressor 10, and the third temperature sensor 140 and the third pressure sensor 150 can respectively 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 gas based on the suction temperature, suction pressure, discharge temperature, and discharge pressure, thereby facilitating control of the operating status of the refrigeration system 100. Compared with the prior art method of manually identifying whether non-condensable gas exists in the system, this method can reduce the occurrence of misjudgments.

[0067] Further, see Figure 2 The refrigeration system 100 further includes a fourth temperature sensor 160 for detecting the temperature of the refrigerant at the input end of the load evaporator 40. The temperature of the refrigerant at the input end of the load evaporator 40 can also be used to determine whether non-condensable gas is present in the refrigeration system 100, thereby facilitating control of the operating status of the refrigeration system 100.

[0068] In some embodiments, see Figure 1 The first circulation loop includes a third pipeline 170 located between the output end of the first throttle valve 31 and the input end of the load evaporator 40. The third pipeline 170 serves as a cooling mechanism. The third pipeline 170 and the second pipeline 80 are the same pipeline, or the third pipeline 170 is part of the second pipeline 80.

[0069] With the above configuration, when refrigeration system 100 is in normal operation, no actual heat exchange occurs during the refrigerant's passage through first heat exchanger 90. However, when refrigeration system 100 is in the non-condensable gas exhaust state, the mixture of gaseous refrigerant and non-condensable gas in first pipeline 70 exchanges heat with the refrigerant in third pipeline 170 in first heat exchanger 90. The mixture of gaseous refrigerant and non-condensable gas transfers heat to the low-temperature refrigerant in third pipeline 170, achieving secondary condensation. By using third pipeline 170 as the cooling mechanism, the structural configuration of refrigeration system 100 can be simplified.

[0070] In other embodiments, see Figure 2 The refrigeration system 100 further includes a second compressor 180, a second condenser 190, and a second throttle valve 1110. The second compressor 180, the second condenser 190, the second throttle valve 1110, and the first condenser 20 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 refrigerant circulates between the second compressor 180, the second condenser 190, the second throttle valve 1110, and the first condenser 20. When the refrigerant flows through the first condenser 20, it exchanges heat with the refrigerant in the first circulation loop to condense the refrigerant in the first circulation loop. It can be seen that the first condenser 20 is the evaporator of the second circulation loop and the condenser of the first circulation loop. The first condenser 20 is also called an evaporative condenser. The second circulation loop is a high-temperature stage circulation loop, and the first circulation loop is a low-temperature stage circulation loop.

[0071] It should be noted that regardless of whether the refrigeration system 100 is in normal operation or in the non-condensable gas evacuation state, the second circulation loop can be in operation to condense the refrigerant in the first circulation loop. Generally, the second compressor 180 is started first, and the second circulation loop is operated. After the second compressor 180 has been started normally for a certain period of time, the first compressor 10 is restarted.

[0072] Furthermore, the second circulation loop includes a fourth pipeline 1120 located between the output end of the second throttle valve 1110 and the input end of the first condenser 20, and the fourth pipeline 1120 serves as a cooling mechanism. When the refrigeration system 100 is in normal operation, no actual heat exchange occurs during the refrigerant flow through the first heat exchanger 90. When the refrigeration system 100 is in a non-condensable gas exhaust state, the mixture of gaseous refrigerant and non-condensable gas in the first pipeline 70 exchanges heat with the refrigerant in the fourth pipeline 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 pipeline 1120, achieving secondary condensation. By using the fourth pipeline 1120 as a cooling mechanism, the structural arrangement of the refrigeration system 100 can also be simplified.

[0073] In some embodiments, see Figure 1 and Figure 2 A first control valve 1130 is provided on the first pipeline 70. First control valve 1130 is used to control the on / off state of first pipeline 70. Since first control valve 1130 can control the on / off state of first pipeline 70, it is equivalent to controlling the on / off state between first exhaust port 52 and second inlet 61, thereby facilitating the switching of refrigeration system 100 between normal operation and a non-condensable gas exhaust state. Optionally, first control valve 1130 is a solenoid valve.

[0074] Furthermore, the refrigeration system 100 also includes a fifth pipeline 1140, the two ends of which are respectively connected to the second pipeline 80 and the second liquid discharge port 63. The throttling mechanism also includes a third throttle valve 32, which is provided on the fifth pipeline 1140. The refrigerant in the fifth pipeline 1140 is expanded and reduced in pressure through the third throttle valve 32. The fifth pipeline 1140 is provided to facilitate the connection between the second pipeline 80 and the second liquid discharge port 63. At the same time, the third throttle valve 32 is not only used to expand and reduce the pressure of the refrigerant in the fifth pipeline 1140, but also can control the opening and closing of the fifth pipeline 1140 (when the opening degree of the third throttle valve 32 is 0, the fifth pipeline 1140 is disconnected), and also has the effect of controlling the switching of the refrigeration system 100 between the normal operation state and the non-condensable gas exhaust state.

[0075] Specifically, the first throttle valve 31 , the second throttle valve 1110 and the third throttle valve 32 are all electronic expansion valves.

[0076] It is contemplated that in other embodiments, the throttling mechanism may omit the third throttle valve 32. In this case, the refrigerant in the fifth pipeline 1140 flows into the second pipeline 80 and, after expansion and pressure reduction through the first throttle valve 31, flows to the load evaporator 40. Furthermore, a second control valve 1270 is provided on the fifth pipeline 1140. The second control valve 1270 controls the opening and closing of the fifth pipeline 1140. In other words, the second control valve 1270 can control the opening and closing of the second pipeline 80 and the second drain port 63. Optionally, the second control valve 1270 is a solenoid valve.

[0077] In some embodiments, see Figure 1 and Figure 2The refrigeration system 100 further includes a sixth pipeline 1150, the two ends of which are connected to the second exhaust port 62 and the gas collecting device 110, respectively. The refrigeration system 100 further includes a third control valve 1160, which is provided on the sixth pipeline 1150 to control the on-off of the sixth pipeline 1150. By providing the sixth pipeline 1150 to facilitate the connection between the second exhaust port 62 and the gas collecting device 110, since the third control valve 1160 can control the on-off of the sixth pipeline 1150, it is equivalent to the third control valve 1160 being able to control the on-off between the second exhaust port 62 and the gas collecting device 110, so that the refrigeration system 100 can switch between the normal operation state and the non-condensable gas exhaust state. Optionally, the third control valve 1160 is a solenoid valve.

[0078] Further, see Figure 2 Refrigeration system 100 also includes a second heat exchanger 1170. The second circulation loop includes a seventh pipeline 1260 located between the output end of first compressor 10 and the input end of first condenser 20. Sixth pipeline 1150 and seventh pipeline 1260 are thermally coupled via second heat exchanger 1170. This arrangement, on the one hand, allows the non-condensable gas flowing through sixth pipeline 1150 to pre-cool the refrigerant compressed by first compressor 10, thereby improving system energy efficiency. On the other hand, the non-condensable gas heats up after heat exchange, increasing its pressure and making it easier to release from gas collecting device 110.

[0079] Furthermore, a shutoff valve 1180 is provided on the sixth pipeline 1150. One of the valve ports of shutoff valve 1180 is configured to communicate with a vacuum pump to extract gas from the gas collecting device 110. Specifically, shutoff valve 1180 is located between the third control valve 1160 and the gas collecting device 110. When 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 non-condensable gas content in the gas collecting device 110 is low, the valve port of shutoff valve 1180 is connected to the vacuum pump, which then extracts the non-condensable gas from the gas collecting device 110 through vacuuming.

[0080] In some embodiments, see Figure 1 and Figure 2 A fourth control valve 1190 is installed on the gas collecting device 110, and the fourth control valve 1190 is used to control the connection and disconnection between the gas collecting device 110 and the outside world. When a large amount of non-condensable gas is collected in the gas collecting device 110, the fourth control valve 1190 is controlled to connect the gas collecting device 110 to the outside world for exhaust. It should be noted that during the process of exhausting the gas collecting device 110 to the outside, the third control valve 1160 is in a closed state to prevent the refrigerant from being discharged to the outside through the gas collecting device 110. Specifically, the fourth control valve 1190 is also a solenoid valve.

[0081] Furthermore, a one-way valve 1210 is installed on the gas collecting device 110, which allows the gas in the gas collecting device 110 to flow to the outside. By providing the one-way valve 1210, the gas from the outside is prevented from flowing back to the gas collecting device 110.

[0082] In some embodiments, see Figure 1 The refrigeration system 100 further includes a first temperature sensor 1220, which is used to detect the temperature of the gas in the gas collecting device 110. Figure 1 and Figure 2 The refrigeration system 100 further 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 has reached a preset temperature and / or the first pressure sensor 1230 detects that the pressure of the gas in the gas collecting device 110 has reached a preset pressure, the third control valve 1160 can be controlled to close and the fourth control valve 1190 can be controlled to open for exhaust, thereby avoiding manual judgment based on experience and improving the accuracy of the judgment.

[0083] In other embodiments, see Figure 1 The refrigeration system 100 further includes a first filter dryer 1240 and a second filter dryer 1250. The first filter dryer 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 filter dryer 1240 before flowing to the first gas-liquid separator 50. The second filter dryer 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 filter dryer 1250 before flowing to the second throttle valve 1110 for throttling.

[0084] See Figure 3 Another embodiment of the present application further provides a method for controlling a refrigeration system, comprising the steps of:

[0085] S110: Determine whether the suction temperature and suction pressure of the first compressor 10 are respectively within a first temperature range and a first pressure range.

[0086] 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 performing normally and can operate stably. However, when 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 performing abnormally, and the abnormality must be eliminated before proceeding to the next step.

[0087] It should be noted that the first temperature range and the first pressure range are selected as needed, which vary depending on the structure of the refrigeration system 100 and are not specifically limited here. Specifically, the first temperature range can be set to (T1, T2) and the first pressure range can be set to (P1, P2).

[0088] 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.

[0089] 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 .

[0090] The inventors have found that when different amounts of nitrogen (used to simulate non-condensable gas) are added to the refrigeration system 100 for operation, a critical value will exist. When the nitrogen content in the refrigeration system 100 is high, the exhaust temperature and pressure will increase significantly. This may be because the presence of non-condensable gas hinders the condensation process of the refrigerant and pushes up the pressure of the system. It can be seen that when there is no non-condensable gas in the refrigeration system 100 or there is a relatively small amount of non-condensable gas, the exhaust temperature of the first compressor 10 is within the second temperature range, and the exhaust pressure of the first compressor 10 is also within the second pressure range. When there is a large amount of non-condensable gas in the refrigeration system 100, the exhaust temperature and exhaust pressure of the first compressor 10 will both increase, so that the exhaust temperature exceeds the second temperature range and the exhaust pressure exceeds the second pressure range. In this way, by judging whether the exhaust temperature and exhaust pressure of the first compressor 10 are respectively within the second temperature range and the second pressure range, it can be determined whether there is a large amount of non-condensable gas in the refrigeration system 100.

[0091] 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.

[0092] S130: If the exhaust temperature is greater than or equal to the first temperature upper limit of the second temperature range and the exhaust pressure is greater than or equal to the pressure upper limit of the second pressure range, the refrigerant discharged from the first exhaust port 52 of the first gas-liquid separator 50 is controlled to be cooled by the cooling mechanism and then passed into the second inlet 61 of the second gas-liquid separator 60.

[0093] Specifically, the second temperature range can be set to (T3, T4) and the second pressure range can be set to (P3, P4). If the exhaust temperature is greater than or equal to T4 and the exhaust pressure is greater than or equal to P4, it indicates that a large amount of non-condensable gas is present in the refrigeration system 100. The first exhaust port 52 of the first gas-liquid separator 50 is controlled to communicate with 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 with the second inlet 61 of the second gas-liquid separator 60.

[0094] 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 controlled to communicate with 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 may also be controlled to communicate after the refrigeration system 100 continues to operate for a fourth preset period of time, to allow a certain amount of time for the non-condensable gas to accumulate.

[0095] The fourth preset duration is set as needed. Optionally, the fourth preset duration is 30 seconds. Of course, in other embodiments, the specific value of the fourth preset duration is not limited.

[0096] S140: Control the gas collecting device 110 to communicate with the second exhaust port 62 of the second gas-liquid separator 60 to collect non-condensable gas.

[0097] Specifically, the third control valve 1160 is opened so that the gas collecting device 110 is in communication with the second exhaust port 62 of the second gas-liquid separator 60 .

[0098] When the gas collecting device 110 is connected to the second exhaust port 62 of the second gas-liquid separator 60 , non-condensable gas formed after the first gas-liquid separation in the first gas-liquid separator 50 and the second gas-liquid separation in the second gas-liquid separator 60 enters the gas collecting device 110 and is collected.

[0099] 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 to the second pipeline 80 through the fifth pipeline 1140, and then flows to the load evaporator 40 through the second pipeline 80 to participate in the temperature control of the electronic components. In some embodiments, the refrigerant in the fifth pipeline 1140 is expanded and reduced in pressure through the third throttle valve 32, and the first throttle valve 31 is changed to a fixed opening of n% for operation. The third throttle valve 32 automatically adjusts the opening according to the current operating conditions to meet the temperature requirements of the load end (the load evaporator 40 serves as the load end). In other embodiments, the second control valve 1270 is opened, and the refrigerant in the fifth pipeline 1140 is expanded and reduced in pressure through the first throttle valve 31. The first throttle valve 31 automatically adjusts the opening to meet the temperature requirements of the load end.

[0100] The control method for the refrigeration system provided in the embodiment of the present application determines whether the exhaust temperature and exhaust pressure of the first compressor 10 are respectively within the second temperature range and the second pressure range when the intake temperature is within the first temperature range and the intake pressure is within the first pressure range. When the exhaust temperature is greater than or equal to the first temperature upper limit of the second temperature range and the exhaust pressure is greater than or equal to the pressure upper limit of the second pressure range, the refrigerant discharged from the first exhaust port 52 of the first gas-liquid separator 50 is controlled to be cooled by the cooling mechanism and then passed into the second inlet 61 of the second gas-liquid separator 60, and the gas collecting device 110 is controlled to be connected to the second exhaust port 62 of the second gas-liquid separator 60 to collect non-condensable gas. At this time, the refrigerant passes through the first condenser 20 for the first condensation. The refrigerant after the first condensation enters the first gas-liquid separator 50 for the first gas-liquid separation. The gas after the first gas-liquid separation enters the first heat exchanger 90 for the second condensation. The refrigerant after the second condensation enters the second gas-liquid separator 60 for the second gas-liquid separation. After each condensation, the refrigerant is separated by a gas-liquid separator, which ensures the condensation effect of the refrigerant while facilitating the separation of non-condensable gases from the refrigerant and collecting them in the gas collecting device 110. Since the gas collected in the gas collecting device is mostly non-condensable gas, the refrigerant in the entire system does not need to be discharged together in order to discharge the non-condensable gas in the system as in the prior art, thus avoiding waste of refrigerant.

[0101] In some embodiments, before S110, the process further includes the following steps:

[0102] Determining whether the operating time of the refrigeration system 100 is greater than or equal to a second preset time;

[0103] If the operating time of the refrigeration system 100 is greater than or equal to the second preset time, step S110 is executed.

[0104] The operating time of the refrigeration system 100 is the operating time of the refrigeration system 100 in a normal operating state. 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 short, misjudgment 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 be determined 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.

[0105] The above configuration, when the operating time of the refrigeration system 100 is greater than or equal to the second preset time, executes step S110, which can reduce the occurrence of misjudgment.

[0106] It should be noted that the second preset duration is selected according to needs and is not limited here.

[0107] In some embodiments, see Figure 4 , after S140, also includes:

[0108] S150: Control the gas collecting device 110 to disconnect from the second exhaust port 62;

[0109] 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.

[0110] Furthermore, the S150 also includes:

[0111] The first exhaust port 52 of the first gas-liquid separator 50 is controlled to be disconnected from the second inlet 61 of the second gas-liquid separator 60. At this time, the refrigeration system 100 is switched back to the normal operation state.

[0112] S160: Control the gas collecting device 110 to communicate with the outside to exhaust.

[0113] Specifically, the fourth control valve 1190 is opened to connect the gas collecting device 110 to the outside for exhaust. At this time, the non-condensable gas stored in the gas collecting device 110 is discharged to the outside, so as to facilitate the collection of the non-condensable gas next time.

[0114] Furthermore, after S160, it also includes:

[0115] Controlling the gas collecting device 110 to be disconnected from the outside world;

[0116] Return to step S110.

[0117] Specifically, after controlling the gas collecting device 110 to be disconnected from the outside, the step of determining whether the operating time of the refrigeration system 100 is greater than or equal to the second preset time is first performed. If the operating time of the refrigeration system 100 is greater than or equal to the second preset time, step S110 is then performed.

[0118] By returning to step S110, it is determined again whether the suction temperature and the suction pressure of the first compressor 10 are respectively within the first temperature range and the first pressure range, and this cycle is repeated to avoid the presence of a large amount of non-condensable gas in the refrigeration system 100.

[0119] In some embodiments, before S150, the process further includes the following steps:

[0120] Determine whether the duration of the communication between the gas collecting device 110 and the second exhaust port 62 is greater than or equal to a first preset duration;

[0121] If the connection time is greater than or equal to the first preset time, the gas collecting device 110 is controlled to be disconnected from the second exhaust port 62 .

[0122] When the gas collecting device 110 is connected to the second exhaust port 62 for a short time, 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 relatively low. If the pressure is lower than the external atmospheric pressure or the pressure is not much 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 in turn prolongs the collection time and is not conducive to the stable operation of the system.

[0123] It can be seen that setting the connection time to be greater than or equal to the first preset time and then controlling the gas collecting device 110 to disconnect from the second exhaust port 62 can ensure that enough non-condensable gas is collected in the gas collecting device 110, avoid frequent control of valve opening and closing, shorten the collection time, and facilitate stable operation of the system.

[0124] The first preset time period is set as needed and is not specifically limited herein. Generally, the first preset time period 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 non-condensable gases in the refrigeration system 100 are excessive and require multiple collection cycles.

[0125] In some embodiments, the gas collected in the gas collecting device 110 is the gas that has undergone 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 are heat exchanged in the second heat exchanger 1170 before entering the gas collecting device 110. After S150, the following steps are also included:

[0126] It is determined whether the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure.

[0127] The first pressure is greater than atmospheric pressure. In some embodiments, the first pressure is 3 atmospheric pressures. The pressure of the gas in the gas collecting device 110 is detected by the first pressure sensor 1230.

[0128] If the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure, step S160 is executed.

[0129] 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 the pressure difference, thereby ensuring the exhaust effect.

[0130] Furthermore, if the pressure of the gas in the gas collecting device 110 is lower than the first pressure, the valve port of the control stop valve 1180 is connected to the vacuum pumping device to evacuate the gas in the gas collecting device 110 .

[0131] When the pressure of the gas in the gas collecting device 110 is lower than the first pressure, it proves that there is less non-condensable gas in the gas collecting device 110, and it cannot be automatically discharged from the gas collecting device 110 under the action of the pressure difference. The vacuum equipment can extract the residual gas in the gas collecting device 110 to ensure that there is no gas residual in the gas collecting device 110.

[0132] It should be noted that when the vacuum equipment extracts the gas in the gas collecting device 110 , the third control valve 1160 is in a closed state and will not affect the operation of the refrigeration system 100 .

[0133] 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 through the sixth pipeline 1150. After S150, the following steps are also included:

[0134] Determining whether the temperature of the gas above the gas collecting device 110 is greater than the first temperature;

[0135] According to the density properties of the gaseous refrigerant and the non-condensable gas, assuming that the gas collecting device 110 still contains the gaseous refrigerant, since the density of the non-condensable gas is relatively small, it will occupy the space above the gas collecting device 110, and the gaseous refrigerant will be mainly concentrated below. Due to the different boiling points, when the gas collected by the gas collecting device 110 is a 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 minimum temperature of the non-condensable gas should be maintained above 0°C, and the temperature of the gaseous refrigerant should be below 0°C. The first temperature can be set to be greater than or equal to 0°C.

[0136] Specifically, the first temperature sensor 1220 is installed above the gas collecting device 110 to detect the temperature above the gas collecting device 110 .

[0137] If the temperature of the gas above the gas collecting device 110 is greater than the first temperature, it is determined whether the pressure of the gas in the gas collecting device 110 is greater than or equal to the first pressure.

[0138] When the temperature of the upper gas in the gas collecting device 110 is greater than the first temperature, it is proved that the gas collected in the gas collecting device 110 is non-condensable gas. It is further judged whether the pressure of the gas in the gas collecting device 110 is greater than the first pressure to determine whether the exhaust condition is met.

[0139] 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 controlled to open, and the gas collecting device 110 is connected to the outside to exhaust. At this time, under the action of the pressure difference, the gas in the gas collecting device 110 is automatically discharged to the outside.

[0140] If the pressure of the gas in the gas collecting device 110 is lower than the first pressure, the gas collecting device 110 is controlled to communicate with the second exhaust port 62 to collect the non-condensable gas;

[0141] Determining whether the pressure of the gas in the gas collecting device 110 is greater than or equal to the second pressure;

[0142] 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 controlled to be disconnected from the second exhaust port 62 , and the gas collecting device 110 is controlled to be connected to the outside for exhaust.

[0143] 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.

[0144] Of course, in some other embodiments, the first pressure and the second pressure may be set in other ways, which are not limited here.

[0145] 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 non-condensable gas exists 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 at this time is insufficient and it is necessary to continue collecting gas so as to exhaust under the action of the pressure difference.

[0146] In some embodiments, if the temperature of the gas above the gas collecting device 110 is lower than the first temperature, the first exhaust port 52 is disconnected from the second inlet 61. Alternatively, the first control valve 1130 is closed, and the first exhaust port 52 and the second inlet 61 are disconnected.

[0147] When the temperature of the upper gas in the gas collecting device 110 is lower than the first temperature, it proves that no non-condensable gas is collected in the gas collecting device 110, indicating that the non-condensable gas in the refrigeration system 100 is exhausted. At this time, the first exhaust port 52 is controlled to be disconnected from the second inlet 61, and the refrigeration system 100 switches to the normal operation state.

[0148] It should be noted here that after the above-mentioned fourth control valve 1190 opens to control the gas collecting device 110 to connect with the outside world for exhaust for a certain period of time, such as 1s-2s, it is then closed and stabilized for a certain period of time, such as 10s, and the temperature and pressure in the gas collecting device 110 are detected again until the temperature of the gas above the gas collecting device 110 is lower than the first temperature, and the non-condensable gas is discharged.

[0149] It should also be noted here 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, and it is impossible to judge whether there is non-condensable gas in the gas collecting device 110 by temperature.

[0150] The inventors also discovered that by adding varying amounts of nitrogen (used to simulate non-condensable gases) to refrigeration system 100 and operating it, they found that when the nitrogen content in refrigeration system 100 was low, the exhaust temperature and pressure did not change significantly, but the outlet liquid temperature (the temperature of the refrigerant as it flows to the load evaporator 40) fluctuated significantly. Combining experimental methods with theoretical experience, they concluded that the most obvious manifestation of the presence of trace amounts of non-condensable gases in refrigeration system 100 is peak fluctuations in the outlet liquid temperature, resulting in data points exceeding the accuracy standard.

[0151] In some embodiments, after S120, the process further includes the following steps:

[0152] If the exhaust gas temperature is within the second temperature range and the exhaust gas temperature is within the second pressure range, determining whether the liquid inlet temperature of the load evaporator 40 of the refrigeration system 100 is within the third temperature range;

[0153] The fourth temperature sensor 160 obtains the liquid inlet temperature of the load evaporator 40 .

[0154] If the liquid inlet temperature is greater than the second upper temperature limit 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 controlled to be connected after the refrigeration system 100 continues to operate for at least a third preset time period;

[0155] Execute step S140.

[0156] The third temperature range is the range of the liquid inlet temperature when there is no non-condensable gas in the refrigeration system 100. The third temperature range varies adaptively according to different working conditions and is not limited here.

[0157] When the liquid inlet temperature is greater than the second upper temperature limit of the third temperature range, it indicates that a small amount (trace amount) of non-condensable gas is present in the refrigeration system 100. After the refrigeration system 100 continues to operate for at least the third preset time period, the non-condensable gas accumulates, and the first exhaust port 52 of the first gas-liquid separator 50 is controlled to communicate with the second inlet 61 of the second gas-liquid separator 60, and step S140 is executed to facilitate the collection of the non-condensable gas.

[0158] It should be noted that the third preset duration is selected according to needs and is not specifically limited here.

[0159] The subsequent steps of the refrigeration system 100 for discharging a small amount of non-condensable gas are the same as the steps for discharging a large amount of non-condensable gas, and will not be described in detail here.

[0160] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0161] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A control method for a refrigeration system, characterized in that: Including steps: determining whether the suction temperature and suction pressure of the first compressor (10) are respectively within a first temperature range and a first pressure range; If the intake temperature is within the first temperature range and the intake pressure is within the first pressure range, determining whether the exhaust temperature and the exhaust pressure of the first compressor (10) are respectively within the second temperature range and the second pressure range; If the exhaust temperature is greater than or equal to the first temperature upper limit of the second temperature range and the exhaust pressure is greater than or equal to the pressure upper limit of the second pressure range, the refrigerant discharged from the first exhaust port (52) of the first gas-liquid separator (50) is controlled to be cooled by the cooling mechanism and then passed into the second inlet (61) of the second gas-liquid separator (60); The gas collecting device (110) is controlled to communicate with the second exhaust port (62) of the second gas-liquid separator (60) to collect non-condensable gas.

2. The control method of the refrigeration system according to claim 1, characterized in that: After controlling the gas collecting device (110) to communicate with the second exhaust port (62) of the second gas-liquid separator (60) to collect non-condensable gas, the method further includes the following steps: Controlling the gas collecting device (110) to disconnect from the second exhaust port (62); The gas collecting device (110) is controlled to communicate with the outside to exhaust gas.

3. The control method of the refrigeration system according to claim 2, characterized in that: After controlling the gas collecting device (110) to communicate with the outside to exhaust, the method further includes the following steps: Controlling the gas collecting device (110) to disconnect from the outside world; Return to execute the above steps to determine whether the suction temperature and suction pressure of the first compressor (10) are respectively within the first temperature range and the first pressure range.

4. The control method of the refrigeration system according to claim 2, characterized in that: Before controlling the gas collecting device (110) to disconnect from the second exhaust port (62), the method further includes the following steps: Determining whether the duration of the communication between the gas collecting device (110) and the second exhaust port (62) is greater than or equal to a first preset duration; If the connection time is greater than or equal to the first preset time, the gas collecting device (110) is controlled to disconnect from the second exhaust port (62).

5. The control method of the refrigeration system according to claim 2, characterized in that: The gas collected by the gas collecting device (110) is the gas that has undergone heat exchange with the refrigerant at the exhaust end of the first compressor (10); After controlling the gas collecting device (110) to disconnect from the second exhaust port (62), the method further includes the following steps: determining whether the pressure of the gas in the gas collecting device (110) is greater than or equal to a first pressure; If the pressure of the gas in the gas collecting device (110) is greater than or equal to the first pressure, the gas collecting device (110) is controlled to be connected to the outside to exhaust gas.

6. The control method of the refrigeration system according to claim 5, characterized in that: Also includes the steps: If the pressure of the gas in the gas collecting device (110) is lower than the first pressure, the valve port of the control stop valve (1180) is connected to the vacuum pumping device to evacuate the gas in the gas collecting device (110).

7. The control method of the refrigeration system according to claim 2, characterized in that: The gas collected by the gas collecting device (110) is the gas that has not exchanged heat with the refrigerant at the exhaust end of the first compressor (10); After controlling the gas collecting device (110) to disconnect from the second exhaust port (62), the method further includes the following steps: Determining whether the temperature of the gas above the gas collecting device (110) is greater than a first temperature; If the temperature of the gas in the gas collecting device (110) is greater than the first temperature, determining whether the pressure of the gas in the gas collecting device (110) is greater than or equal to the first pressure; If the pressure of the gas in the gas collecting device (110) is greater than or equal to the first pressure, the gas collecting device (110) is controlled to be connected to the outside to exhaust gas.

8. The control method of the refrigeration system according to claim 7, characterized in that: Also includes the steps: If the pressure of the gas in the gas collecting device (110) is lower than the first pressure, controlling the gas collecting device (110) to communicate with the second exhaust port (62) to collect the non-condensable gas; determining whether the pressure of the gas in the gas collecting device (110) is greater than or equal to a second pressure; 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 controlled to be disconnected from the second exhaust port (62), and the gas collecting device (110) is controlled to be connected to the outside to exhaust gas; Wherein, the second pressure is greater than or equal to the first pressure.

9. The control method of the refrigeration system according to claim 7, characterized in that: Also includes the steps: If the temperature of the gas above the gas collecting device (110) is lower than the first temperature, the first exhaust port (52) is controlled to be disconnected from the second inlet (61).

10. The control method of the refrigeration system according to claim 1, characterized in that: Before determining whether the suction temperature and suction pressure of the first compressor (10) are respectively within the first temperature range and the first pressure range, the method further comprises the steps of: Determining whether the operating time of the refrigeration system is greater than or equal to a second preset time; If the operating time of the refrigeration system is greater than or equal to the second preset time, it is determined whether the suction temperature and the suction pressure of the first compressor (10) are respectively within the first temperature range and the first pressure range.

11. The control method for a refrigeration system according to any one of claims 1 to 10, characterized in that: If the intake temperature is within the first temperature range and the intake pressure is within the first pressure range, after determining whether the exhaust temperature and the exhaust pressure of the first compressor (10) are respectively within the second temperature range and the second pressure range, the method further comprises the steps of: If the exhaust temperature is within the second temperature range and the exhaust pressure is within the second pressure range, determining whether the liquid inlet temperature of the load evaporator (40) of the refrigeration system is within a third temperature range; If the liquid inlet temperature is greater than a second upper temperature limit of the third temperature range, controlling the first exhaust port (52) of the first gas-liquid separator (50) to be connected to the second inlet (61) of the second gas-liquid separator (60) after the refrigeration system continues to operate for at least a third preset time period; The step of controlling the gas collecting device (110) to communicate with the second exhaust port (62) of the second gas-liquid separator (60) to collect non-condensable gas is performed.

Images