Vacuumizing equipment for refrigerating system

Abstract

The utility model relates to vacuumizing equipment for a refrigerating system, which comprises a vacuum pump, an inflating component, a power supply component and a controller, and the vacuum pump is connected with the refrigerating system through a vacuum pipeline; an air source in the inflating assembly is connected with a compressor in the refrigerating system through an air conveying pipeline; the power supply assembly comprises a power supply part and a power-on circuit. The compressor is connected with the power supply part through the power-on circuit. After the vacuum pump works for a certain time, the controller controls the vacuum pump and the compressor to vacuumize the refrigerating system at the same time, gas at the low-pressure end of the refrigerating system is extracted to the high-pressure end by means of the self-suction and exhaust capacity of the compressor, and then the vacuum pump extracts the gas from the high-pressure end, so that the vacuumizing efficiency of the refrigerating system is improved; and the production efficiency of the refrigeration equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum pumping equipment, in particular to a vacuum pumping equipment for a refrigeration system. Background Art

[0002] Vacuuming is an important process step in the production of refrigerators, freezers and other refrigeration equipment. Its purpose is to remove garbage, dirt and air from the refrigeration system environment, on the one hand to purify the system environment, and on the other hand to make the environment inside the system reach the standard negative pressure.

[0003] refer to Figure 1 The existing vacuum equipment is generally connected to the refrigeration system through a vacuum pipeline. The vacuum process takes a long time. The specific vacuum capacity depends on the capacity of the vacuum pump equipment. The vacuum efficiency is low, which in turn affects the specific production efficiency of refrigeration equipment such as refrigerators and freezers. Summary of the invention

[0004] The purpose of the utility model is to provide a vacuum pumping device for a refrigeration system, so as to solve the problems existing in the prior art that during the production process of the existing refrigeration equipment, the vacuum pumping process of the refrigeration system relies on a vacuum pump, the vacuum pumping efficiency is low, and the production efficiency of the refrigeration equipment is low.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0006] The utility model proposes a vacuum pumping device for a refrigeration system, which comprises:

[0007] A vacuum pump connected to the refrigeration system via a vacuum pipeline;

[0008] An air charging assembly, comprising an air source, an air pipeline and a vent valve, wherein the air source is connected to a compressor in the refrigeration system through the air pipeline;

[0009] A power supply assembly, comprising a power supply unit and a power supply line, wherein the compressor is connected to the power supply unit via the power supply line, and the power supply unit is used to supply power to the compressor;

[0010] A controller is connected to the vacuum pump, the inflation component and the power supply component, and the controller is configured to control the vacuum pump to evacuate the refrigeration system alone, control the inflation component to inflate gas into the refrigeration system, and control the power supply component to supply power to the compressor so that the compressor and the vacuum pump can jointly evacuate the refrigeration system.

[0011] In some embodiments of the present application, the refrigeration system includes a compressor, a condenser, a filter and an evaporator which are connected in sequence through a refrigerant pipeline, a first connecting part is formed on the compressor, the vacuum pipeline includes a first pipeline, the vacuum pump is connected to the first connecting part through the first pipeline, and the gas pipeline is connected to the first connecting part.

[0012] In some embodiments of the present application, a second connecting portion is formed on the filter, the vacuum pipeline further includes a second pipeline, and the vacuum pump is connected to the second connecting portion via the second pipeline.

[0013] In some embodiments of the present application, a first switch valve is provided on the first pipeline, and a second switch valve is provided on the second pipeline, which are used to control the opening and closing of the first pipeline and the second pipeline respectively.

[0014] In some embodiments of the present application, a first pressure detection component is provided on the first pipeline for detecting the pressure in the refrigeration system.

[0015] In some embodiments of the present application, a ventilation valve is provided on the gas pipeline to control the on-off of the gas pipeline.

[0016] In some embodiments of the present application, a capillary tube is further provided between the filter and the evaporator.

[0017] In some embodiments of the present application, the controller is connected to the compressor, the first pressure detection component, the first switch valve, the second switch valve, the air source, the ventilation valve and the vacuum pump.

[0018] In some embodiments of the present application, the controller is configured to, upon receiving a vacuuming instruction, turn on the vacuum pump, the first switch valve, and the second switch valve to individually vacuum the refrigeration system until the first pressure detection component detects that the pressure in the refrigeration system drops to no more than a first preset pressure, and then turn off the vacuum pump, the first switch valve, and the second switch valve.

[0019] In some embodiments of the present application, the controller is configured to control the opening of the vent valve and the gas source after the single vacuum pumping is completed, and to fill the refrigeration system with inert gas until the pressure of the refrigeration system detected by the first pressure detection component rises to not less than a second preset pressure, and the controller closes the gas source and the vent valve.

[0020] In some embodiments of the present application, the controller is configured to control the power supply part to be energized after the filling of the inert gas is completed, supply power to the compressor, and turn on the vacuum pump, the first switch valve and the second switch valve, and the compressor and the vacuum pump jointly evacuate the refrigeration system until the pressure of the refrigeration system detected by the first pressure detection component drops to less than a third preset pressure.

[0021] Compared with the prior art, the advantages and positive effects of the utility model are:

[0022] The vacuuming equipment for a refrigeration system involved in the present application comprises a vacuum pump, an air charging component, a power supply component and a controller. The controller controls the vacuum pump to evacuate the refrigeration system to a first preset pressure, and then controls the air charging component to fill the refrigeration system with inert gas to a second preset pressure. The controller then powers the compressor through the power supply component to enable the vacuum pump and the compressor to evacuate the refrigeration system at the same time. With the help of the compressor's own suction and exhaust capacity, the gas at the low-pressure end of the refrigeration system is drawn to the high-pressure end, and then the vacuum pump extracts the gas from the high-pressure end. The compressor and the vacuum pump work together to evacuate air, which can improve the vacuuming efficiency of the refrigeration system, thereby improving the production efficiency of the refrigeration equipment.

[0023] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of vacuum pumping a refrigeration system in the prior art;

[0026] Figure 2 This is a schematic diagram of the structure of the vacuum pumping equipment for the refrigeration system involved in this application;

[0027] Figure 3 This is a schematic diagram of the connection between the compressor, power supply component, and inflation component;

[0028] Figure 4 A schematic diagram of the gas flow path in the refrigeration system during the vacuum pump single extraction process involved in this application;

[0029] Figure 5 A schematic diagram of gas flow during the compressor charging process according to an embodiment;

[0030] Figure 6 A schematic diagram of a gas flow path during a joint extraction process of a compressor and a vacuum pump according to an embodiment;

[0031] Figure 7 Flow chart of vacuuming the refrigeration system for vacuuming equipment;

[0032] Reference numerals:

[0033] 10. Refrigerant pipeline; 20. Vacuum pipeline; 21. First pipeline; 22. Second pipeline; 30. Gas pipeline; 40. Power line;

[0034] 100. compressor; 110. first connecting portion;

[0035] 200, condenser; 300, filter; 310, second connection part; 400, evaporator; 500, vacuum pump;

[0036] 610, first switch valve; 620, ventilation valve; 630, second switch valve;

[0037] 700. Power Supply Department;

[0038] 810, first pressure detection component; 820, second pressure detection component;

[0039] 900. Capillary. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0046] refer to Figure 2 The present application proposes a vacuum pumping device for a refrigeration system, which includes a vacuum pump 500, an air charging component, a power supply component and a controller.

[0047] The vacuum pump 500 is connected to the refrigeration system via the vacuum pipeline 20 and is used to evacuate the refrigeration system.

[0048] The inflation assembly includes an air source, an air pipeline 30 and a vent valve 620 , and the vent valve 620 is disposed on the air pipeline 30 .

[0049] The gas source is connected to the compressor 100 in the refrigeration system through the gas pipeline 30 , and is used to fill the refrigeration system with inert gas through the compressor 100 to protect the performance of the compressor 100 .

[0050] The power supply assembly includes a power supply unit 700 and a power supply line 40 , and the compressor 100 is connected to the power supply unit 700 via the power supply line 40 .

[0051] The power supply unit 700 is used to supply power to the compressor 100 so that the compressor 100 can work in cooperation with the vacuum pump 500 through its own suction and exhaust capabilities to evacuate the refrigeration system.

[0052] The controller is connected to the vacuum pump 500, the inflation component and the power supply component. The controller is configured to control the vacuum pump 500 to evacuate the refrigeration system alone, control the inflation component to inflate gas into the refrigeration system, and control the power supply component to supply power to the compressor 100 so that the compressor 100 and the vacuum pump 500 can jointly evacuate the refrigeration system.

[0053] The refrigeration system includes a compressor 100 , a condenser 200 , a filter 300 , and an evaporator 400 which are sequentially connected via a refrigerant pipeline 10 .

[0054] The condenser 200 is connected to the output end of the compressor 100 , and the evaporator 400 is connected to the input end of the compressor 100 .

[0055] A first connection portion 110 is formed on the compressor 100 , the vacuum pipeline 20 includes a first pipeline 21 , and the vacuum pump 500 is connected to the first connection portion 110 via the first pipeline 21 .

[0056] The gas pipeline 30 is connected to the first connection part 110. Specifically, an adapter is connected to the end of the first connection part 110. The adapter is a three-way connector, one of which is used to connect to the first connection part 110, and the other two connectors are connected to the gas pipeline 30 and the first pipeline 21 respectively.

[0057] Combination Figure 3 The first pipeline 21 and the gas pipeline 30 are respectively connected to the compressor 100 , and a vent valve 620 is provided on the gas pipeline 30 for controlling the on-off of the gas pipeline 30 .

[0058] The first pipeline is provided with a first switch valve 610 for controlling the on-off of the first pipeline.

[0059] Compared with the prior art, the refrigeration system is only vacuumed by the vacuum pump 500, which results in low vacuuming efficiency. The overall purity of the environment in the refrigeration system cannot be guaranteed by the vacuum pump alone, resulting in problems such as poor refrigeration effect of the refrigeration equipment in the later stage.

[0060] In addition to the vacuum pump, the present application also utilizes the self-inhalation and exhaust capabilities of the compressor 100 in the refrigeration system to evacuate the low-pressure end, and the high-pressure end evacuation is achieved using the second connection portion 310 on the filter 300.

[0061] Specifically, a second connecting portion 310 is formed on the filter 300 , the vacuum pipeline 20 further includes a second pipeline 22 , and the vacuum pump 500 is connected to the second connecting portion 310 via the second pipeline 22 .

[0062] The second pipeline 22 is provided with a second switch valve 630 for controlling the on-off of the second pipeline 22 .

[0063] A capillary tube 900 is further disposed between the filter 300 and the evaporator 400 .

[0064] The diameter of the capillary tube 900 is relatively small, so extraction is difficult. The area between the output end of the capillary tube 900 and the compressor 100 is a low-pressure end, and the area between the input end of the capillary tube 900 and the output end of the compressor 100 is a high-pressure end.

[0065] The gas in the low-pressure end is output to the vacuum pump 500 through the first connecting portion 110 and the first pipeline 21 on the compressor 100 .

[0066] The gas in the high-pressure end is output to the vacuum pump 500 through the second connecting portion 310 on the filter 300 and the second pipeline 22 .

[0067] A first pressure detection component 810 is provided on the first pipeline 21, and a second pressure detection component 820 is provided on the second pipeline 22, for detecting the pressure in the refrigeration system.

[0068] The pressure of the refrigeration system detected by the first pressure detection component 810 is the pressure on the low-pressure side. The controller controls the vacuum pump 500 to control the pressure reference in the refrigeration system when the refrigeration system is evacuated, controls the end of inflation of the inflation component into the refrigeration system, and controls the compressor 100 and the vacuum pump 500 to end. The pressure reference in the refrigeration system is preferably the pressure on the low-pressure side, so as to improve the stability of the system operation and ensure the final vacuum degree of the refrigeration system.

[0069] Since the air humidity in the refrigeration system is relatively high at the beginning, the compressor 100 cannot participate in the vacuuming, otherwise it will affect the service life and internal structure of the compressor 100. Therefore, at the beginning, the vacuum pump 500 works alone to vacuum the refrigeration system.

[0070] Since the compressor 100 cannot be turned on in an environment with a relatively low vacuum degree, otherwise it will have an impact on the compressor 100, such as reducing the service life of the compressor 100 and increasing maintenance costs.

[0071] Therefore, after the vacuum pump 500 works alone until the vacuum degree of the refrigeration system drops to the target pressure, inert gas is injected into the refrigeration system to increase the pressure in the refrigeration system to a pressure range suitable for the operation of the compressor 100. The injection of inert gas can also further reduce the humidity in the refrigeration system and ensure the stability of the operation of the compressor 100.

[0072] Therefore, before the compressor is turned on, it needs to be filled with inert gas.

[0073] Specifically, the controller is connected to the compressor 100 , the first pressure detection member 810 , the first switch valve 610 , the second switch valve 630 , the air source, the ventilation valve 620 and the vacuum pump 500 .

[0074] refer to Figure 4 The controller is configured to, upon receiving a vacuuming instruction, turn on the vacuum pump 500, the first switch valve 610 and the second switch valve 630, and perform a separate vacuuming on the refrigeration system until the first pressure detection component 810 detects that the pressure in the refrigeration system drops to no more than the first preset pressure P1, and then turn off the vacuum pump 500, the first switch valve 610 and the second switch valve 630.

[0075] refer to Figure 5 The controller is configured to control the vent valve 620 and the gas source to open after the single vacuuming is completed, and to fill the refrigeration system with inert gas until the pressure of the refrigeration system detected by the first pressure detection component 810 rises to not less than the second preset pressure, and the controller closes the gas source and the vent valve 620.

[0076] refer to Figure 6 The controller is configured to control the power supply unit 700 to be powered after the inert gas is filled, supply power to the compressor 100, and turn on the vacuum pump 500, the first switch valve 610 and the second switch valve 630. The compressor 100 and the vacuum pump 500 jointly evacuate the refrigeration system until the pressure of the refrigeration system detected by the first pressure detection component drops to less than the third preset pressure.

[0077] Next, combine Figure 4-Figure 7 , the specific process of using the vacuum equipment to vacuum the refrigeration system is described in detail:

[0078] The controller receives a vacuuming instruction, which specifically includes a vacuuming button or a control panel, a mobile phone, or other signal control.

[0079] The controller controls the vacuum pump 500 , the first switch valve 610 on the first pipeline 21 , and the second switch valve 630 on the second pipeline 22 to open.

[0080] The vacuum pump 500 uses mechanical, physical, chemical or physicochemical methods to evacuate the refrigeration system.

[0081] The first detection component monitors the system pressure on the low-pressure side of the refrigeration system in real time.

[0082] When the system pressure P detected by the first detection component is not greater than the first preset pressure P1, that is, P≤P1, the controller shuts down the vacuum pump 500, the first switch valve 610 and the second switch valve 630, and opens the gas source and the vent valve 620.

[0083] After the gas source is turned on, an inert gas such as nitrogen is filled into the refrigeration system through the ventilation pipeline until the system pressure P rises to a value not less than the second preset pressure P2.

[0084] After the system pressure P satisfies P≥P2, the controller shuts off the gas source and the vent valve 620, turns on the power supply unit 700 to supply power to the compressor 100, and turns on the vacuum pump 500, the first switch element, and the second switch element at the same time.

[0085] After the compressor 100 is started, the residual gas in the refrigeration system is extracted from the low-pressure end and discharged to the high-pressure end of the compressor 100 for discharge by the vacuum pump 500. The vacuuming capability of the compressor 100 is utilized to achieve the requirement of rapid vacuuming, which greatly shortens the manufacturing process of refrigerators and freezers, and the vacuuming time is shortened from 20-30 minutes to about 10 minutes. This improves production efficiency and also plays a role in energy saving and efficiency improvement.

[0086] The vacuum pump 500 extracts the gas discharged from the compressor 100 and other remaining gas in the refrigeration system from the refrigeration system, and the vacuum extraction efficiency is greatly improved.

[0087] The compressor 100 and the vacuum pump 500 jointly evacuate the refrigeration system until the pressure P of the refrigeration system detected by the first pressure detection component drops to less than the third preset pressure P3. The controller then shuts down the power supply unit 700, the compressor 100, the vacuum pump 500, etc., and the vacuuming ends.

[0088] Among them, the range of P1 is 80~120Pa, the range of P2 is 180~220Pa, so as to meet the performance requirements of the compressor 100, and the range of P3 is 2~6Pa.

[0089] In some embodiments of the present application, a second pressure detecting component 820 is also provided on the second pipeline 22, which is used to detect the pressure of the refrigeration system passing through one side of the second pipeline 22, and is used to assist in judging the stability of the refrigeration system. The second pressure detecting component 820 detects the pressure at the high-pressure end of the refrigeration system, and therefore will be slightly higher than the pressure of the refrigeration system detected by the first pressure detecting component 810.

[0090] The pressure difference of the refrigeration system detected by the second pressure detection component 820 and the first pressure detection component 810 can assist in monitoring the vacuuming progress of the refrigeration system and improve the stability and accuracy of the vacuuming process.

[0091] In some embodiments of the present application, a vacuum degree detection device may be added to convert the vacuum degree value into an electrical signal and transmit it to the main control board of the controller. The main control board is integrated with a PID power chip or a thyristor, and the compressor 100 can be powered on and off according to pre-set control rules.

[0092] In other words, in addition to the first pressure detection device and the second pressure sensor, a device for detecting the vacuum degree can also be added in the refrigeration system. The vacuum degree device is connected to the controller to transmit the detected vacuum degree signal to the controller. When the vacuum degree detected by the vacuum degree device meets the requirements, the controller finally shuts down the vacuum pump 500 and the compressor 100.

[0093] This further ensures the vacuum degree of the refrigeration system, improves the purity of the environment inside the refrigerator refrigeration system, and also makes the negative pressure reach the standard.

[0094] The controller controls the vacuum pump 500 to evacuate the refrigeration system to a first preset pressure, and then controls the inflation component to fill the refrigeration system with inert gas to a second preset pressure. The controller then supplies power to the compressor 100 through the power supply component to enable the vacuum pump 500 and the compressor 100 to evacuate the refrigeration system at the same time.

[0095] With the help of the self-suction and exhaust capacity of the compressor 100, the gas at the low-pressure end of the refrigeration system is pumped to the high-pressure end, and then the vacuum pump 500 extracts the gas from the high-pressure end. The compressor 100 and the vacuum pump 500 work together to improve the vacuum efficiency of the refrigeration system, thereby improving the production efficiency of the refrigeration equipment.

[0096] It solves the performance defects of refrigerator such as poor refrigeration and ice blockage caused by the purity of the environment and negative pressure in the system, and has a simple structure and is easy to operate.

[0097] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0098] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A vacuum pumping device for a refrigeration system, characterized in that: include: A vacuum pump connected to the refrigeration system via a vacuum pipeline; An air charging assembly, comprising an air source, an air pipeline and a vent valve, wherein the air source is connected to a compressor in the refrigeration system through the air pipeline; A power supply assembly, comprising a power supply unit and a power supply line, wherein the compressor is connected to the power supply unit via the power supply line, and the power supply unit is used to supply power to the compressor; A controller is connected to the vacuum pump, the inflation component and the power supply component, and the controller is configured to control the vacuum pump to evacuate the refrigeration system alone, control the inflation component to inflate gas into the refrigeration system, and control the power supply component to supply power to the compressor so that the compressor and the vacuum pump can jointly evacuate the refrigeration system.

2. The vacuum pumping device for a refrigeration system according to claim 1, characterized in that: The refrigeration system includes a compressor, a condenser, a filter and an evaporator which are connected in sequence through a refrigerant pipeline. A first connecting part is formed on the compressor. The vacuum pipeline includes a first pipeline. The vacuum pump is connected to the first connecting part through the first pipeline, and the gas pipeline is connected to the first connecting part.

3. The vacuum pumping device for a refrigeration system according to claim 2, characterized in that: A second connecting portion is formed on the filter, the vacuum pipeline further includes a second pipeline, and the vacuum pump is connected to the second connecting portion via the second pipeline.

4. The vacuum pumping device for a refrigeration system according to claim 3, characterized in that: The first pipeline is provided with a first switch valve, and the second pipeline is provided with a second switch valve, which are used to control the on-off of the first pipeline and the second pipeline respectively.

5. The vacuum pumping device for a refrigeration system according to claim 4, characterized in that: The first pipeline is provided with a first pressure detection element for detecting the pressure in the refrigeration system; and / or The gas pipeline is provided with a vent valve for controlling the on-off of the gas pipeline.

6. The vacuum pumping device for a refrigeration system according to claim 2, characterized in that: A capillary tube is also arranged between the filter and the evaporator.

7. The vacuum pumping device for a refrigeration system according to claim 5, characterized in that: The controller is connected to the compressor, the first pressure detection member, the first switch valve, the second switch valve, the air source, the ventilation valve, and the vacuum pump.

8. The vacuum pumping device for a refrigeration system according to claim 7, characterized in that: The controller is configured to, upon receiving a vacuuming instruction, turn on the vacuum pump, the first switch valve, and the second switch valve to individually vacuum the refrigeration system until the first pressure detection component detects that the pressure in the refrigeration system drops to no more than a first preset pressure, and then turn off the vacuum pump, the first switch valve, and the second switch valve.

9. The vacuum pumping device for a refrigeration system according to claim 8, characterized in that: The controller is configured to control the opening of the vent valve and the gas source after the single vacuuming is completed, and to fill the refrigeration system with inert gas until the pressure of the refrigeration system detected by the first pressure detection component rises to not less than a second preset pressure, and the controller closes the gas source and the vent valve.

10. The vacuum pumping device for a refrigeration system according to claim 9, characterized in that: The controller is configured to control the power supply unit to be powered on to supply power to the compressor, and to start the vacuum pump, the first switch valve and the second switch valve after the inert gas is filled. The compressor and the vacuum pump jointly evacuate the refrigeration system until the pressure of the refrigeration system detected by the first pressure detection component drops to less than a third preset pressure.

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