Evacuator of refrigeration equipment and refrigeration equipment

Abstract

The utility model relates to the technical field of vacuumizing, and provides an evacuating device of refrigeration equipment and the refrigeration equipment, the evacuating device of the refrigeration equipment comprises a connector, a first vacuum pump, a second vacuum pump and an exhaust pipeline, and the connector is used for being connected with a refrigeration pipeline of the refrigeration equipment; the first vacuum pump and the second vacuum pump are connected with the connector, and the exhaust pressure of the second vacuum pump is smaller than that of the first vacuum pump. The exhaust pipeline is connected with the connector, the first vacuum pump and the second vacuum pump. The refrigerating pipeline is primarily vacuumized through the first vacuum pump, then the second vacuum pump capable of working under the lower pressure is used for vacuumizing, the first vacuum pump can rapidly reduce the initial pressure, the second vacuum pump can continue to work under the lower pressure, and the lower vacuum degree is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of vacuum pumping, and particularly relates to a vacuum pumping device for a refrigeration device and a refrigeration device. Background Art

[0002] In related technologies, the method of filling refrigerant in refrigeration devices such as air-cooled refrigerators is usually to first use a vacuum pump to pump the vacuum degree of the refrigeration pipeline below 5 Pa, and then use a refrigerant filling device to detect the vacuum degree. After the vacuum degree meets the requirements, the set refrigerant is filled. However, the existing vacuum pumping devices cannot reduce the vacuum degree of the refrigeration pipeline to a lower level. Summary of the Utility Model

[0003] Embodiments of this application provide a vacuum pumping device for a refrigeration device and a refrigeration device to solve the problem that the existing vacuum pumping devices cannot achieve a lower vacuum degree.

[0004] In a first aspect, embodiments of this application provide a vacuum pumping device for a refrigeration device, including:

[0005] An interface for connecting to the refrigeration pipeline of the refrigeration device;

[0006] A first vacuum pump and a second vacuum pump, both the first vacuum pump and the second vacuum pump are connected to the interface, and the exhaust pressure of the second vacuum pump is less than the exhaust pressure of the first vacuum pump;

[0007] A suction pipeline connecting the interface, the first vacuum pump, and the second vacuum pump.

[0008] In some embodiments of this application, the first vacuum pump is a rotary vane vacuum pump, and / or the second vacuum pump is a molecular pump.

[0009] In some embodiments of this application, the suction pipeline includes a first branch and a second branch. The first branch is provided with a first vacuum valve, and the first vacuum valve is located between the first vacuum pump and the interface; the second branch is provided with a second vacuum valve, and the second vacuum valve is located between the second vacuum pump and the interface;

[0010] Or, the first vacuum pump, the second vacuum pump, and the interface are connected in sequence, and a first vacuum valve is arranged between the first vacuum pump and the second vacuum pump, and a second vacuum valve is arranged between the second vacuum pump and the interface; a suction branch is arranged between the suction ports of the first vacuum pump and the second vacuum pump, and the suction branch is provided with a third vacuum valve.

[0011] In some embodiments of this application, the vacuum pumping device further includes:

[0012] A vacuum gauge, which is connected to the evacuation pipeline, is configured to generate a first electrical signal when detecting that the vacuum degree of the refrigeration pipeline is less than a preset threshold value;

[0013] A control device, which is adapted to receive the first electrical signal and generate a corresponding first control signal, and the first control signal is used to turn off the first vacuum pump and start the second vacuum pump.

[0014] In some embodiments of the present application, the evacuation device further includes a connection detection sensor, which generates a second electrical signal when detecting that the interface is disconnected from the refrigeration pipeline, and the control device is adapted to receive the second electrical signal and generate a corresponding second control signal, and the second control signal is used to turn off the second vacuum pump.

[0015] In some embodiments of the present application, the number of the interfaces is multiple, and the multiple interfaces are all connected to the first vacuum pump and the second vacuum pump.

[0016] In some embodiments of the present application, the number of the first vacuum pumps is multiple, and the multiple first vacuum pumps are arranged in series;

[0017] And / or, the number of the second vacuum pumps is multiple, and the multiple second vacuum pumps are arranged in series.

[0018] In some embodiments of the present application, the evacuation device of the refrigeration equipment further includes an outer frame, which forms an accommodation space, and the first vacuum pump, the second vacuum pump and the evacuation pipeline are accommodated in the accommodation space, and the interface is located outside the accommodation space.

[0019] In some embodiments of the present application, the evacuation device further includes a heating component, which is connected to the interface to convey heating gas to the refrigeration pipeline.

[0020] In a second aspect, an embodiment of the present application further provides a refrigeration equipment, which includes the evacuation device of the refrigeration equipment as described in any one of the above.

[0021] The evacuation device of the refrigeration equipment provided by the embodiment of the present application includes an interface, a first vacuum pump, a second vacuum pump and an evacuation pipeline. The interface is used to connect to the refrigeration pipeline of the refrigeration equipment; both the first vacuum pump and the second vacuum pump are connected to the interface, and the exhaust pressure of the second vacuum pump is less than that of the first vacuum pump; the evacuation pipeline connects the interface, the first vacuum pump and the second vacuum pump. The refrigeration pipeline is initially evacuated by the first vacuum pump, and then the second vacuum pump, which can work at a lower pressure, is used for evacuation. The first vacuum pump can quickly reduce the initial pressure, while the second vacuum pump can continue to work at a lower pressure to achieve a lower vacuum degree.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0024] In order to more fully understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. Among them, the same reference numerals in the following description represent the same parts.

[0025] Figure 1 Structural schematic of the evacuation device of the refrigeration equipment provided by the embodiment of the present application Figure 1 .

[0026] Figure 2 Structural schematic of the evacuation device of the refrigeration equipment provided by the embodiment of the present application Figure 2 .

[0027] Figure 3 Structural schematic of the evacuation device of the refrigeration equipment provided by the embodiment of the present application Figure 3 .

[0028] Figure 4 Structural schematic of the evacuation device of the refrigeration equipment provided by the embodiment of the present application Figure 4 .

[0029] Figure 5 Structural schematic diagram of the evacuation device of the prior art.

[0030] Reference numerals:

[0031] 100, interface;

[0032] 200, first vacuum pump;

[0033] 300, second vacuum pump;

[0034] 400, extraction pipeline; 410, first branch; 420, second branch; 430, extraction branch; 401, first vacuum valve; 402, second vacuum valve; 403, third vacuum valve; 440, vacuum gauge;

[0035] 500, outer frame; 600, heating component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following further describes the embodiments of the present application in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0037] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application 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 cannot be understood as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0039] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below", and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0040] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0041] At present, the method of filling refrigerant in the refrigeration system of household air-cooled refrigerators is to first use a vacuum pump to pump the vacuum degree of the refrigeration pipeline below 5 Pa, and then use a refrigerant filling device to detect the vacuum degree. After the vacuum degree meets the requirements, the set refrigerant is filled. The vacuum pump moves along the wire body, and the evacuation time is about 20 minutes. When there are many refrigeration pipelines or the ambient temperature is relatively low, the vacuum degree of some boxes may be too high to meet the requirements of refrigerant filling, and the high vacuum degree means high water content in the system.

[0042] In addition to extracting the non-condensable gases in the system, the vacuum pump also needs to extract the moisture in the system. The moisture in the system is the most difficult to extract and is also an important factor leading to a long evacuation time. If the moisture in the system is too high, it will cause ice blockage in the system, and the moisture in the system will also react with the refrigerant compressor oil to produce acid, corroding the pipeline. Figure 5 FIG. is a schematic structural diagram of a vacuuming device in the prior art. A conventional vacuum pump is used for vacuuming. In the early stage of vacuuming, the vacuuming speed is relatively fast. When the vacuum degree drops to 50 Pa, the vacuuming efficiency will decrease. Statistics were made on a refrigerator:

[0043] Table 1

[0044]

[0045] It was found by comparison that during the evacuation process at 25 °C, the time taken for the vacuum degree (0.1 Mpa → 50 Pa) was 3 minutes, and the time taken for the vacuum degree (50 Pa → 5 Pa) was 13 minutes. As the vacuum degree of the pipeline system decreases, the system will be evacuated more and more slowly. The evacuation time at a room temperature of 10 °C is longer than that at 25 °C.

[0046] The embodiment of the present application provides a vacuuming device for a refrigeration device and a refrigeration device to solve the problem that the existing vacuuming device for a refrigeration device cannot achieve a lower vacuum degree. The following will be described in conjunction with the attached Figures 1-4 for illustration.

[0047] The vacuuming device for a refrigeration device provided by the embodiment of the present application can be applied to refrigeration devices such as refrigerators, freezers, and air conditioners. Exemplarily, please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of the vacuuming device for a refrigeration device provided by the embodiment of the present application.

[0048] According to an embodiment of the present application, referring to Figure 1As shown in the figure, the evacuation device of the refrigeration equipment includes an interface 100, a first vacuum pump 200, a second vacuum pump 300, and an evacuation pipeline 400. The interface 100 is used to connect to the refrigeration pipeline of the refrigeration equipment; both the first vacuum pump 200 and the second vacuum pump 300 are connected to the interface 100, and the exhaust pressure of the second vacuum pump 300 is less than the exhaust pressure of the first vacuum pump 200; the evacuation pipeline 400 connects the interface 100, the first vacuum pump 200, and the second vacuum pump 300.

[0049] It can be understood that in this embodiment, the degree of vacuum represents the air pressure in the refrigeration pipeline. The lower the degree of vacuum, the lower the air pressure in the refrigeration pipeline. The first vacuum pump 200 serves as a roughing pump in the evacuation device and is responsible for initially extracting the gas in the refrigeration pipeline. For example, the first vacuum pump 200 can be a rotary vane vacuum pump, which has a high pumping speed and a certain exhaust pressure at the initial stage of evacuation and can quickly reduce the pressure in the system; the second vacuum pump 300 serves as an auxiliary pump, and its exhaust pressure is less than that of the first vacuum pump 200, and is used to further extract the residual gas when the pressure in the system drops to a lower level. Due to the lower exhaust pressure, the second vacuum pump 300 can more effectively remove the trace gas in the system and improve the evacuation effect. The second vacuum pump 300 can adopt a pump with high precision and low exhaust pressure such as a molecular pump.

[0050] Exemplarily, first start the first vacuum pump 200 for evacuation, and then start the second vacuum pump 300 for evacuation when the vacuum pump drops to a certain extent. If the high-precision second vacuum pump 300 is directly started for evacuation, the second vacuum pump 300 may be damaged due to the too high internal pressure of the system. By first using the first vacuum pump 200 for roughing, the internal pressure of the system can be reduced, and the second vacuum pump 300 can be protected from damage.

[0051] The evacuation device of the refrigeration equipment provided by the embodiment of the present application includes an interface 100, a first vacuum pump 200, a second vacuum pump 300, and an evacuation pipeline 400. The interface 100 is used to connect to the refrigeration pipeline of the refrigeration equipment; both the first vacuum pump 200 and the second vacuum pump 300 are connected to the interface 100, and the exhaust pressure of the second vacuum pump 300 is less than the exhaust pressure of the first vacuum pump 200; the evacuation pipeline 400 connects the interface 100, the first vacuum pump 200, and the second vacuum pump 300. By initially evacuating the refrigeration pipeline with the first vacuum pump 200 and then using the second vacuum pump 300 that can work at a lower pressure for evacuation, the evacuation efficiency can be significantly improved, the evacuation time can be reduced, the first vacuum pump 200 can quickly reduce the initial pressure, and the second vacuum pump 300 can continue to work at a lower pressure to reach a lower degree of vacuum.

[0052] In an alternative embodiment, the first vacuum pump 200 is a rotary vane vacuum pump, and / or the second vacuum pump 300 is a molecular pump.

[0053] During the rough pumping stage of the rotary vane vacuum pump in the first vacuum pump 200, the pumping speed is fast. After pumping for a certain period of time, when the vacuum degree of the refrigeration pipeline drops to a certain level, the evacuation rate of the first vacuum pump 200 will slow down and the efficiency will decrease. At this time, the first vacuum pump 200 can be turned off, and the second vacuum pump 300 can be switched to continue pumping the refrigeration pipeline, reducing the vacuum degree of the refrigeration pipeline to a lower level. The cooperation of the first vacuum pump 200 and the second vacuum pump 300 makes full use of the characteristics of the two pumps, ensuring both the pumping efficiency and reducing the vacuum degree of the refrigeration pipeline to a lower level.

[0054] In an alternative embodiment, referring to Figure 2 As shown, the suction pipeline 400 includes a first branch 410 and a second branch 420. The first branch 410 is provided with a first vacuum valve 401, and the first vacuum valve 401 is located between the first vacuum pump 200 and the interface 100; the second branch 420 is provided with a second vacuum valve 402, and the second vacuum valve 402 is located between the second vacuum pump 300 and the interface 100.

[0055] In this embodiment, the first vacuum valve 401 is located between the first vacuum pump 200 and the interface 100 to control the on-off of the first branch 410. When it is necessary to start the first vacuum pump 200 for rough pumping, the first vacuum valve 401 is opened; when the rough pumping is completed or it is necessary to stop the first vacuum pump 200, the first vacuum valve 401 is closed. The second vacuum valve 402 is located between the second vacuum pump 300 and the interface 100 to control the on-off of the second branch 420. When it is necessary to start the second vacuum pump 300 for fine pumping, the second vacuum valve 402 is opened; when the fine pumping is completed or it is necessary to stop the second vacuum pump 300, the second vacuum valve 402 is closed.

[0056] By separately controlling the on-off of the first branch 410 and the second branch 420, the sequence and time of rough pumping and fine pumping can be flexibly arranged, thereby optimizing the entire evacuation process and improving the evacuation efficiency.

[0057] In another alternative embodiment, referring to Figure 1 As shown, the first vacuum pump 200, the second vacuum pump 300 and the interface 100 are connected in sequence, and a first vacuum valve 401 is provided between the first vacuum pump 200 and the second vacuum pump 300, and a second vacuum valve 402 is provided between the second vacuum pump 300 and the interface 100; a suction branch 430 is provided between the suction ports of the first vacuum pump 200 and the second vacuum pump 300, and the suction branch 430 is provided with a third vacuum valve 403.

[0058] In this embodiment, when it is necessary to start the first true pump for rough pumping, the first vacuum valve 401 and the third vacuum valve 403 are opened. When the rough pumping is completed or it is necessary to stop the first vacuum pump 200, the first vacuum valve 401 and the third vacuum valve 403 are closed. When it is necessary to start the second vacuum valve 402 for fine pumping, the first vacuum valve 401 and the third vacuum valve 403 are closed, and the second vacuum valve 402 is opened. When the fine pumping is completed or it is necessary to stop the second vacuum pump 300, the second vacuum valve 402 is closed.

[0059] In an alternative embodiment, referring to Figure 1 as shown, the evacuation device further includes a vacuum gauge 440 and a control device. The vacuum gauge 440 is connected to the evacuation pipeline 400 and is used to generate a first electrical signal when detecting that the vacuum degree of the refrigeration pipeline is less than a preset threshold. The control device is adapted to receive the first electrical signal and generate a corresponding first control signal, and the first control signal is used to turn off the first vacuum pump 200 and start the second vacuum pump 300.

[0060] In this embodiment, when the evacuation device is started, the first vacuum pump 200 starts to work and performs rough pumping on the refrigeration pipeline. At this time, the second vacuum pump 300 is in the closed state. As the first vacuum pump 200 continues to work, the vacuum degree in the refrigeration pipeline gradually decreases. The vacuum gauge 440 monitors the change of the vacuum degree in real time and feeds back the vacuum degree value to the control device. When the vacuum gauge 440 detects that the vacuum degree of the refrigeration pipeline is less than the preset rough pumping threshold, a first electrical signal is generated, indicating that the rough pumping stage has been completed and the fine pumping stage can be switched to. After receiving the first electrical signal, the control device immediately generates a first control signal to turn off the first vacuum pump 200 and turn on the second vacuum pump 300. At this time, the gas in the refrigeration pipeline will be mainly extracted by the second vacuum pump 300 to achieve a lower vacuum degree.

[0061] By setting the vacuum gauge 440 and the control device, the automation of the evacuation process is realized, and the first vacuum pump 200 can be timely turned off and the second vacuum pump 300 can be turned on, avoiding energy waste caused by the continuous operation of the first vacuum pump 200 when it has reached the limit vacuum degree it can reach.

[0062] In an alternative embodiment, the evacuation device further includes a connection detection sensor. The connection detection sensor generates a second electrical signal when detecting that the interface 100 is disconnected from the refrigeration pipeline. The control device is adapted to receive the second electrical signal and generate a corresponding second control signal, and the second control signal is used to turn off the second vacuum pump 300.

[0063] When the evacuation device is applied to the evacuation operation of the production line, during the entire evacuation process, the connection detection sensor continuously monitors the connection status between the interface 100 and the refrigeration pipeline. If the sensor detects that the interface 100 is disconnected, it will immediately generate a second electrical signal. For example, when the evacuation of a refrigerator is completed, the connector is disconnected to perform the evacuation of the next refrigerator. After receiving the second electrical signal, the control device will immediately recognize that the interface 100 has been disconnected. At this time, emergency measures need to be taken to prevent the fine evacuation pump from continuing to operate and pumping in air, which may cause excessive load and affect the lifespan. Therefore, the control device will generate a second control signal to close the second vacuum pump 300.

[0064] Optionally, while closing the second vacuum pump 300, the control device can also decide whether to reopen the first vacuum pump 200 for rough evacuation according to the preset logic and the requirements of the production line. If the production line needs to immediately evacuate the next refrigerator, the control device can keep the first vacuum pump 200 in the on state or reopen it to prepare for the next rough evacuation.

[0065] While closing the second vacuum pump 300, the control device will also control the relevant vacuum valves to switch to ensure the correct path of gas flow. For example, the second vacuum valve 402 is closed to prevent air from entering the second vacuum pump 300 through the interface 100.

[0066] In an alternative embodiment, referring to Figure 4 As shown, the number of interfaces 100 is multiple, and the multiple interfaces 100 are all connected to the first vacuum pump 200 and the second vacuum pump 300.

[0067] In this embodiment, by setting multiple interfaces 100, multiple different pipelines can be evacuated simultaneously. Exemplarily, the number of interfaces 100 can be set to 2. When evacuating a large refrigerator with a complex pipeline, these 2 connectors can be respectively connected to the refrigerator compressor process pipe and the filter process pipe for simultaneous evacuation; when evacuating a small refrigerator and washing machine, a small refrigerator generally has only one compressor process pipe interface 100. At this time, the evacuation device can evacuate two refrigerators simultaneously, improving the evacuation efficiency.

[0068] In an alternative embodiment, the number of the first vacuum pumps 200 is multiple, and the multiple first vacuum pumps 200 are connected in series; and / or, the number of the second vacuum pumps 300 is multiple, and the multiple second vacuum pumps 300 are connected in series.

[0069] It can be understood that after multiple first vacuum pumps 200 or second vacuum pumps 300 are connected in series, the air extraction capacity of the evacuation device can be improved. Each vacuum pump can further reduce the pressure on the basis of the previous vacuum pump, thereby achieving a lower vacuum degree and improving the evacuation effect.

[0070] In an alternative embodiment, refer to Figure 1 As shown, the evacuation device of the refrigeration equipment further includes an outer frame 500. The outer frame 500 forms a receiving space. The first vacuum pump 200, the second vacuum pump 300, and the suction pipeline 400 are accommodated in the receiving space, and the interface 100 is located outside the receiving space.

[0071] In this embodiment, the receiving space of the outer frame 500 provides a reasonable layout space for the first vacuum pump 200, the second vacuum pump 300, and the suction pipeline 400, making the entire device more compact and orderly, and also reducing the damage of the external environment to the evacuation device.

[0072] In an alternative embodiment, refer to Figure 4 As shown, the evacuation device further includes a heating component 600. The heating component 600 is communicated with the interface 100 to convey heated gas to the refrigeration pipeline.

[0073] In this embodiment, before evacuating the air, the refrigeration pipeline can be heated by introducing high-temperature heated gas inside the pipeline first. When the gas temperature inside the refrigeration pipeline is relatively high, the evacuation efficiency can be effectively improved, and the evacuation time of the refrigeration pipeline is greatly reduced.

[0074] Exemplarily, the heating component 600 may include an air compressor and a pipeline heater. The air compressor is mainly responsible for compressing external air into high-pressure gas. Through compression, the volume of the air decreases and the density increases. The pipeline heater heats the compressed air, and the heated high-temperature and high-pressure gas is introduced into the refrigeration pipeline. Due to the high ventilation efficiency of the high-temperature and high-pressure gas, the residual gas and impurities inside the refrigeration pipeline can be discharged faster, and the temperature rising efficiency is high, further improving the evacuation efficiency and speed.

[0075] In a second aspect, the embodiment of the present application further provides a refrigeration equipment. The refrigeration equipment includes the evacuation device of the refrigeration equipment as described in the above embodiment. By applying the evacuation device of the above embodiment to evacuate the air, the vacuum degree of the refrigeration pipeline in the refrigeration equipment is greatly reduced, which is convenient for subsequent refrigerant filling.

[0076] As shown in Table II below, in the present application, on the basis of the existing vacuum pump, an additional fine evacuation system is added. When the system reaches 50 pa, the valve is switched, and it is switched to the second vacuum pump. The second vacuum pump is a molecular pump, which has a high evacuation efficiency at a vacuum degree below 50 pa.

[0077] Table II

[0078]

[0079] It can be seen from the comparison between Table 1 and Table 2 that, compared with the existing evacuation device, the evacuation device of the present application has significantly shortened evacuation time at a vacuum degree (50 Pa → 5 Pa), has a relatively high air extraction efficiency, and can reach a lower vacuum degree within the same air extraction time.

[0080] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications, or equivalent replacements of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and should all be covered within the protection scope of the present application.

Claims

1. A evacuation device for a refrigeration equipment, characterized in that, Comprising: An interface (100) for connecting to the refrigeration pipeline of the refrigeration device; A first vacuum pump (200) and a second vacuum pump (300), both the first vacuum pump (200) and the second vacuum pump (300) are connected to the interface (100), and the exhaust pressure of the second vacuum pump (300) is less than the exhaust pressure of the first vacuum pump (200); An extraction pipeline (400) connecting the interface (100), the first vacuum pump (200) and the second vacuum pump (300).

2. The evacuation device of the refrigeration equipment according to claim 1, characterized in that, The first vacuum pump (200) is a rotary vane vacuum pump, and / or the second vacuum pump (300) is a molecular pump.

3. The evacuation device for a refrigeration device according to claim 1, characterized in that, The extraction pipeline (400) includes a first branch (410) and a second branch (420). The first branch (410) is provided with a first vacuum valve (401), and the first vacuum valve (401) is located between the first vacuum pump (200) and the interface (100); the second branch (420) is provided with a second vacuum valve (402), and the second vacuum valve (402) is located between the second vacuum pump (300) and the interface (100); Or, the first vacuum pump (200), the second vacuum pump (300) and the interface (100) are connected in sequence, and a first vacuum valve (401) is provided between the first vacuum pump (200) and the second vacuum pump (300), and a second vacuum valve (402) is provided between the second vacuum pump (300) and the interface (100); an extraction branch (430) is provided between the suction ports of the first vacuum pump (200) and the second vacuum pump (300), and the extraction branch (430) is provided with a third vacuum valve (403).

4. The evacuation device of the refrigeration equipment according to claim 1, characterized in that The evacuation device further includes: A vacuum gauge (440) communicating with the extraction pipeline (400), and the vacuum gauge (440) is used to generate a first electrical signal when detecting that the vacuum degree of the refrigeration pipeline is less than a preset threshold; A control device adapted to receive the first electrical signal and generate a corresponding first control signal, and the first control signal is used to turn off the first vacuum pump (200) and start the second vacuum pump (300).

5. The evacuation device of the refrigeration equipment according to claim 4, characterized in that The evacuation device further includes a connection detection sensor, and the connection detection sensor is used to generate a second electrical signal when detecting that the interface (100) is disconnected from the refrigeration pipeline. The control device is adapted to receive the second electrical signal and generate a corresponding second control signal, and the second control signal is used to turn off the second vacuum pump (300).

6. The evacuation device of a refrigeration equipment according to claim 1, characterized in that, The number of the interfaces (100) is multiple, and multiple interfaces (100) are all communicated with the first vacuum pump (200) and the second vacuum pump (300).

7. The evacuation device of the refrigeration equipment according to claim 1, characterized in that, The number of the first vacuum pumps (200) is multiple, and multiple first vacuum pumps (200) are arranged in series; and / or, the number of the second vacuum pumps (300) is multiple, and multiple second vacuum pumps (300) are arranged in series.

8. The evacuation device of a refrigeration equipment according to claim 1, characterized in that, The evacuation device of the refrigeration equipment further includes an outer frame (500), the outer frame (500) forms an accommodation space, the first vacuum pump (200), the second vacuum pump (300) and the air extraction pipeline (400) are accommodated in the accommodation space, and the interface (100) is located outside the accommodation space.

9. The evacuation device of the refrigeration equipment according to any one of claims 1-8, characterized in that, The evacuation device further includes a heating component (600), the heating component (600) is communicated with the interface (100) to convey heating gas to the refrigeration pipeline.

10. A refrigeration device, characterized in that, The refrigeration equipment includes the evacuation device of the refrigeration equipment according to any one of claims 1-9.

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