Vacuumizing equipment and refrigerator

Abstract

The utility model relates to the technical field of vacuumizing, and provides vacuumizing equipment and a refrigerator, the vacuumizing equipment comprises a connector, a vacuum pump assembly, a heating assembly and an exhaust pipeline, and the connector is used for being connected with a to-be-vacuumized pipeline; the vacuum pump assembly is connected with the interface; the heating assembly comprises an air compressor and a heater, an outlet of the air compressor is connected with the heater, and the heater is connected with the connector through a gas conveying pipeline so as to introduce heating gas into the pipeline to be evacuated; the air compressor and the heater are arranged to form high-temperature and high-pressure gas, the high-temperature and high-pressure gas is introduced into the to-be-evacuated pipeline, the temperature of gas in the to-be-evacuated pipeline can be rapidly increased, and the vacuum pump assembly has the higher air extraction rate when the temperature of the to-be-evacuated pipeline is high; therefore, the vacuumizing time can be shortened, and the vacuumizing efficiency of the vacuumizing equipment is greatly improved.

Description

Technical Field

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

[0002] In related technologies, before filling a refrigerant into a refrigeration device such as an air-cooled refrigerator, it is necessary to evacuate the refrigeration pipeline and then fill a set refrigerant. However, the existing vacuum pumping devices take a relatively long time to evacuate and have low evacuation efficiency. Utility Model Content

[0003] Embodiments of this application provide a vacuum pumping device and a refrigerator to solve the problem of low evacuation efficiency of existing vacuum pumping devices.

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

[0005] An interface for connecting to a pipeline to be evacuated;

[0006] A vacuum pump assembly connected to the interface;

[0007] A heating assembly including an air compressor and a heater, an outlet of the air compressor is connected to the heater, and the heater is connected to the interface through an air delivery pipeline to introduce heated gas into the pipeline to be evacuated;

[0008] An air extraction pipeline connecting the interface and the vacuum pump assembly.

[0009] In some embodiments of this application, a first vacuum valve is provided on the air extraction pipeline, and the first vacuum valve is used to connect or close the pipeline between the vacuum pump assembly and the interface.

[0010] In some embodiments of this application, a second vacuum valve is provided on the air delivery pipeline, and the second vacuum valve is used to connect or close the pipeline between the heating assembly and the interface.

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

[0012] A temperature sensor for detecting the gas temperature of the air delivery pipeline and generating a corresponding first electrical signal;

[0013] A control device electrically connected to the temperature sensor and the heater, the control device is used to receive the first electrical signal and generate a corresponding adjustment instruction, and the adjustment instruction is used to adjust the heating power of the heater.

[0014] In some embodiments of the present application, the vacuum pumping device further includes a timer for measuring the heating time of the heater and generating a second electrical signal after the time of the heater reaches a preset heating time. The control device is adapted to generate a shutdown instruction after receiving the second electrical signal to control the heater and the air compressor to shut down.

[0015] In some embodiments of the present application, the temperature of the heated gas is 60°C - 80°C.

[0016] In some embodiments of the present application, the number of the interfaces is multiple, and multiple interfaces are all connected to the heating component and the vacuum pump component.

[0017] In some embodiments of the present application, the vacuum pumping device further includes an outer frame which forms an accommodation space. The vacuum pump component, the heating component and the air extraction pipeline are accommodated in the accommodation space, and the interfaces are located outside the accommodation space.

[0018] In some embodiments of the present application, the vacuum pump component includes a first vacuum pump and a second vacuum pump. The first vacuum pump and the second vacuum pump are both connected to the interface, and the exhaust pressure of the second vacuum pump is less than that of the first vacuum pump.

[0019] In a second aspect, an embodiment of the present application further provides a refrigerator, which includes the vacuum pumping device as described in any one of the above.

[0020] The vacuum pumping device provided by the embodiment of the present application includes an interface, a vacuum pump component, a heating component and an air extraction pipeline. The interface is used to connect to a pipeline to be evacuated; the vacuum pump component is connected to the interface; the heating component includes an air compressor and a heater. The outlet of the air compressor is connected to the heater, and the heater is connected to the interface through an air delivery pipeline to introduce heated gas into the pipeline to be evacuated; the air extraction pipeline connects the interface and the vacuum pump component. By setting the air compressor and the heater to form high-temperature and high-pressure gas and introducing the high-temperature and high-pressure gas into the pipeline to be evacuated, the temperature of the gas inside the pipeline to be evacuated can be rapidly increased. The vacuum pump component has a higher pumping rate when the pipeline to be evacuated is at a high temperature, so that the evacuation time can be reduced, and the efficiency of the vacuum pumping device for evacuating is greatly improved.

[0021] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0023] To more fully understand the present application and its beneficial effects, the following will be described in conjunction with the accompanying drawings. Among them, the same reference numerals in the following description represent the same parts.

[0024] Figure 1 Structural schematic of the vacuum pumping device provided by the embodiment of the present application Figure 1 。

[0025] Figure 2 Structural schematic of the vacuum pumping device provided by the embodiment of the present application Figure 2 。

[0026] Figure 3 Structural schematic of the vacuum pumping device provided by the embodiment of the present application Figure 3 。

[0027] Figure 4 Structural schematic of the vacuum pumping device provided by the embodiment of the present application Figure 4 。

[0028] Figure 5 Structural schematic diagram of the vacuum pumping device of the prior art.

[0029] Reference numerals:

[0030] 100, interface; 200, vacuum pump assembly; 210, first vacuum pump; 220, second vacuum pump; 300, heating assembly; 310, air compressor; 320, heater; 330, gas pipeline; 340, temperature sensor; 400, suction pipeline; 401, first vacuum valve; 402, second vacuum valve; 403, vacuum gauge; 500, outer frame. Detailed implementation manners

[0031] The following will further describe in detail the implementation manners of the present application in conjunction with the accompanying 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.

[0032] 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 should not be construed 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 construed as indicating or implying relative importance.

[0033] 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 circumstances.

[0034] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may 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 may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] In the description of this specification, the description with reference 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 descriptions 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.

[0036] 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 fill the set refrigerant. However, when there are many refrigeration pipelines or the ambient temperature is relatively low, the vacuum degree of the box body may be too high to meet the requirements of refrigerant filling.

[0037] The structural schematic diagram of the vacuum pumping equipment of the prior art is referred to Figure 5 As shown, the interface is connected to the pipeline to be evacuated, and the pipeline to be evacuated is evacuated through the vacuum pump assembly. In addition to extracting the non-condensable gas in the refrigeration system, the moisture in the refrigeration system also needs to be extracted. However, the moisture in the refrigeration system is the most difficult to extract and is an important factor leading to a long evacuation time. If the moisture in the refrigeration 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.

[0038] Taking the refrigeration pipeline of the refrigerator as an example, the experimental data during the evacuation of the refrigeration pipeline of the refrigerator are shown in the following table:

[0039] Table 1

[0040]

[0041] As can be seen from the above table, during the evacuation process at 38°C, the time taken for the vacuum degree (0.1 Mpa → 50 Pa) is 10 minutes, which is relatively short. As the temperature drops, the system will be evacuated more and more slowly. Since the existing vacuum pumps generally use small rotary vane vacuum pumps, the higher the gas temperature in the pipeline, the faster the pumping rate.

[0042] The embodiment of the present application provides a vacuum pumping device and a refrigerator to solve the problem that the vacuum pumping device of the existing refrigeration equipment cannot achieve a lower vacuum degree. The following will be described in conjunction with the attached Figures 1-4 for illustration.

[0043] It can be understood that in this embodiment, the vacuum degree represents the air pressure in the refrigeration pipeline. The lower the vacuum degree, the lower the air pressure in the refrigeration pipeline.

[0044] The vacuum pumping device provided by the embodiment of the present application can be applied to refrigeration equipment such as refrigerators, freezers, and air conditioners. Exemplarily, please refer to Figure 1 , Figure 1 which is the structural schematic diagram of the vacuum pumping device provided by the embodiment of the present application.

[0045] According to an embodiment of the present application, referring to Figure 1 and Figure 2As shown, the vacuum pumping device includes an interface 100, a vacuum pump assembly 200, a heating assembly 300, and a suction pipeline 400. The interface 100 is used to connect to the pipeline to be evacuated; the vacuum pump assembly 200 is connected to the interface 100; the heating assembly 300 includes an air compressor 310 and a heater 320. The outlet of the air compressor 310 is connected to the heater 320, and the heater 320 is connected to the interface 100 through an air delivery pipeline 330 to introduce heated gas into the pipeline to be evacuated; the suction pipeline 400 connects the interface 100 and the vacuum pump assembly 200.

[0046] It can be understood that in this embodiment, the vacuum pump assembly 200 is connected to the interface 100 through the suction pipeline 400 to evacuate the pipeline to be evacuated. The heating assembly 300 includes an air compressor 310 and a heater 320. The air compressor 310 is responsible for generating gas at a certain pressure. The outlet of the air compressor 310 is connected to the heater 320. The high-pressure gas compressed by the air compressor 310 enters the heater 320 for heating. The heated gas then enters the interface 100 through the air delivery pipeline 330 and is introduced into the pipeline to be evacuated to heat the gas in the pipeline to be evacuated and increase the temperature of the pipeline to be evacuated.

[0047] Through the combination of the air compressor 310 and the heater 320, the heating assembly 300 can generate high-temperature and high-pressure gas. When the high-temperature and high-pressure gas enters the pipeline to be evacuated, it will quickly increase the temperature of the gas inside the pipeline. The thermal motion of the high-temperature gas molecules intensifies, resulting in an increase in the collision frequency between gas molecules and an acceleration of the diffusion speed, making it easier to be pumped out by the vacuum pump, greatly shortening the time required to reach the required vacuum degree and improving the evacuation efficiency. Moreover, the high-temperature and high-pressure gas not only accelerates the movement of gas molecules but also helps to carry out small bubbles, moisture, and other impurities in the pipeline.

[0048] In an alternative embodiment, with reference to Figure 1 As shown, the suction pipeline 400 is provided with a first vacuum valve 401, and the first vacuum valve 401 is used to connect or close the pipeline between the vacuum pump assembly 200 and the interface 100.

[0049] In this embodiment, the first vacuum valve 401 is used to control the connection state between the vacuum pump assembly 200 and the pipeline to be evacuated. When the first vacuum valve 401 is opened, the vacuum pump assembly 200 can extract gas from the pipeline to be evacuated through the suction pipeline 400. When the first vacuum valve 401 is closed, the heated gas heated by the heating assembly 300 will not enter the vacuum pump assembly 200.

[0050] In another alternative embodiment, the air delivery pipeline 330 is provided with a second vacuum valve 402, and the second vacuum valve 402 is used to connect or close the pipeline between the heating assembly 300 and the interface 100.

[0051] In this embodiment, the second vacuum valve 402 is used to control the connection state between the heating component 300 and the pipeline to be evacuated. When the second vacuum valve 402 is opened, the gas heated by the heating component 300 can enter the pipeline to be evacuated through the gas transmission pipeline 330 to heat the pipeline to be evacuated. After the pipeline to be evacuated reaches the preset temperature, the second vacuum valve 402 can be closed to stop the gas transmission, which also avoids affecting the evacuation of the pipeline to be evacuated by the vacuum pump assembly 200 during the evacuation process.

[0052] The first vacuum valve 401 and the second vacuum valve 402 can be used to control the independent operation of the vacuum pump assembly 200 and the heating component 300, ensuring the normal operation of the vacuum pumping device.

[0053] In an alternative embodiment, as Figure 1 shown, the vacuum pumping device further includes a temperature sensor 340 and a control device. The temperature sensor 340 is used to detect the gas temperature of the gas transmission pipeline 330 and generate a corresponding first electrical signal; the control device is electrically connected to the temperature sensor 340 and the heater 320. The control device is used to receive the first electrical signal and generate a corresponding adjustment instruction, and the adjustment instruction is used to adjust the heating power of the heater 320.

[0054] Exemplarily, the power of the heater 320 can be adjusted. For example, the power adjustment range of the heater 320 is 0 - 2000w. Before the evacuation starts, the air compressor 310 and the pipeline heater 320 are turned on, the second vacuum valve 402 is opened, and the first vacuum valve 401 is closed for hot gas heating. The initial power of the pipeline heater 320 is 1000w, and the temperature sensor 340 detects the gas temperature. When the temperature is within the range of 60°C - 80°C, heating is performed. When it is detected that the gas temperature is less than 60°C, the power of the heater 320 is increased. When the temperature is higher than 80°C, the power of the heater 320 is decreased until the temperature is within 60°C - 80°C, because too low a temperature will cause insufficient heating, and too high a temperature will damage the refrigerator foaming layer.

[0055] In this embodiment, the control device generates a corresponding adjustment instruction based on the temperature data detected by the temperature sensor 340 to adjust the heating power of the heater 320, ensuring that the temperature of the heated gas fluctuates within the set target range, improving the accuracy and stability of heating, avoiding energy waste, and improving energy utilization efficiency.

[0056] In an alternative embodiment, the vacuum pumping device further includes a timer. The timer is used to measure the heating time of the heater 320 and generate a second electrical signal after the time of the heater 320 reaches the preset heating time. The control device is adapted to generate a shutdown instruction after receiving the second electrical signal to control the heater 320 and the air compressor 310 to shut down.

[0057] In this embodiment, after the heater 320 is turned on for heating, the heating time of the heater 320 can be started. When the heating time reaches the preset heating time threshold, the timer will generate a second electrical signal as a signal indicating that the heating is completed. At this time, the controller will generate a shutdown signal to turn off the heater 320 and the air compressor 310, and the heater 320 and the air compressor 310 will stop working, saving energy.

[0058] Exemplarily, the preset heating time can be 30 s or 40 s. In some other alternative embodiments, the preset heating time can also be set according to manual debugging, and this embodiment does not make specific limitations thereto.

[0059] In an alternative embodiment, referring to Figure 3 as shown, the number of the interfaces 100 is multiple, and the multiple interfaces 100 are all connected to the heating assembly 300 and the vacuum pump assembly 200.

[0060] In this embodiment, by providing multiple interfaces 100, multiple different pipelines can be evacuated simultaneously. Exemplarily, the number of the 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 small ice washers, a small refrigerator generally has only one compressor process pipe interface 100. At this time, the vacuum evacuation device can evacuate two refrigerators simultaneously, improving the evacuation efficiency.

[0061] In an alternative embodiment, the vacuum evacuation device further includes an outer frame 500. The outer frame 500 forms an accommodation space, and the vacuum pump assembly 200, the heating assembly 300, and the evacuation pipeline 400 are accommodated in the accommodation space, and the interfaces 100 are located outside the accommodation space.

[0062] In this embodiment, the accommodation space of the outer frame 500 provides a reasonable layout space for the vacuum pump assembly 200, the heating assembly 300, and the evacuation pipeline 400, making the whole device more compact and orderly, and also reducing the damage of the external environment to the vacuum evacuation device.

[0063] In an alternative embodiment, referring to Figure 4 as shown, the vacuum pump assembly 200 includes a first vacuum pump 210 and a second vacuum pump 220. Both the first vacuum pump 210 and the first vacuum pump 210 are connected to the interface 100, and the exhaust pressure of the second vacuum pump 220 is less than the exhaust pressure of the first vacuum pump 210.

[0064] The first vacuum pump 210 serves as a roughing pump in the vacuum pumping equipment and is responsible for initially pumping the gas in the refrigeration pipeline. For example, the first vacuum pump 210 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 220 serves as an auxiliary pump, and its exhaust pressure is less than that of the first vacuum pump 210 and is used to further pump the residual gas when the pressure in the system drops to a lower level. Due to the lower exhaust pressure, the second vacuum pump 220 can more effectively remove the trace gas in the system and improve the evacuation effect. The second vacuum pump 220 can adopt pumps with high precision and low exhaust pressure such as a molecular pump.

[0065] Exemplarily, first start the first vacuum pump 210 for evacuation. When the vacuum pump drops to a certain extent, then start the second vacuum pump 220 for evacuation. If the high-precision second vacuum pump 220 is directly started for evacuation, the second vacuum pump 220 may be damaged due to the too high internal pressure of the system. By first using the first vacuum pump 210 for rough pumping, the internal pressure of the system can be reduced to protect the second vacuum pump 220 from damage.

[0066] By initially evacuating the refrigeration pipeline with the first vacuum pump 210 and then using the second vacuum pump 220 that can work at a lower pressure for evacuation, the evacuation efficiency can be significantly improved and the evacuation time can be reduced. The first vacuum pump 210 can quickly reduce the initial pressure, while the second vacuum pump 220 can continue to work at a lower pressure to achieve a lower vacuum degree.

[0067] In an alternative embodiment, refer to Figure 1 As shown, a vacuum gauge 403 is provided in the suction pipeline 400, and the vacuum gauge 403 is used to detect the vacuum degree of the pipeline to be evacuated.

[0068] Optionally, when the vacuum pumping equipment is started, the first vacuum pump 210 starts to work and rough pumps the refrigeration pipeline. At this time, the second vacuum pump 220 is in a closed state. As the first vacuum pump 210 continues to work, the vacuum degree in the refrigeration pipeline gradually decreases. The vacuum gauge 403 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 403 detects that the vacuum degree of the refrigeration pipeline is less than a preset rough pumping threshold, an electrical signal is generated, indicating that the rough pumping stage has been completed and the fine pumping stage can be switched. After receiving the electrical signal, the control device immediately generates a control signal to close the first vacuum pump 210 and open the second vacuum pump 220. At this time, the gas in the refrigeration pipeline will be mainly pumped through the second vacuum pump 220 to achieve a higher vacuum degree.

[0069] By setting up a vacuum gauge 403 and a control device, the evacuation process is automated, and the first vacuum pump 210 can be timely shut down and the second vacuum pump 220 can be turned on, avoiding energy waste caused by the continuous operation of the first vacuum pump 210 when the ultimate vacuum degree it can reach has been achieved.

[0070] The vacuum pumping device provided by the embodiment of the present application includes an interface 100, a vacuum pump assembly 200, a heating assembly 300, and a suction pipeline 400. The interface 100 is used to connect with the pipeline to be evacuated; the vacuum pump assembly 200 is connected to the interface 100; the heating assembly 300 includes an air compressor 310 and a heater 320. The outlet of the air compressor 310 is connected to the heater 320, and the heater 320 is connected to the interface 100 through an air delivery pipeline 330 to introduce heated gas into the pipeline to be evacuated. By setting up the air compressor 310 and the heater 320 to form high-temperature and high-pressure gas and introducing the high-temperature and high-pressure gas into the pipeline to be evacuated, the temperature of the gas inside the pipeline to be evacuated can be rapidly increased. The vacuum pump assembly 200 has a higher pumping rate when the pipeline to be evacuated is at a high temperature, so that the evacuation time can be reduced, and the efficiency of the vacuum pumping device for vacuum pumping is greatly improved.

[0071] In a second aspect, the embodiment of the present application further provides a refrigerator. The refrigerator includes the vacuum pumping device as described in the above embodiment. By applying the vacuum pumping device in the above embodiment to evacuate the refrigerator, the evacuation efficiency of the refrigeration pipeline in the refrigerator is greatly improved, and the vacuum degree of the refrigeration pipeline in the refrigerator is also reduced, facilitating subsequent refrigerant filling.

[0072] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] 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 by the protection scope of the present application.

Claims

1. A vacuum extraction device, characterized in that, Comprising: An interface (100) for connecting to a pipeline to be evacuated; A vacuum pump assembly (200) connected to the interface (100); A heating assembly (300) including an air compressor (310) and a heater (320), an outlet of the air compressor (310) is connected to the heater (320), and the heater (320) is connected to the interface (100) through an air delivery pipeline (330) to introduce heated gas into the pipeline to be evacuated; An evacuation pipeline (400) connecting the interface (100) and the vacuum pump assembly (200).

2. The vacuum extraction device according to claim 1, characterized in that, A first vacuum valve (401) is provided on the evacuation pipeline (400), and the first vacuum valve (401) is used to connect or close the pipeline between the vacuum pump assembly (200) and the interface (100).

3. The vacuum extraction device according to claim 1, characterized in that, A second vacuum valve (402) is provided on the air delivery pipeline (330), and the second vacuum valve (402) is used to connect or close the pipeline between the heating assembly (300) and the interface (100).

4. The vacuum pumping device according to claim 1, characterized in that, The evacuation device further includes: A temperature sensor (340) for detecting the gas temperature of the air delivery pipeline (330) and generating a corresponding first electrical signal; A control device electrically connected to the temperature sensor (340) and the heater (320), the control device is used to receive the first electrical signal and generate a corresponding adjustment instruction, and the adjustment instruction is used to adjust the heating power of the heater (320).

5. The vacuum extraction device according to claim 4, wherein The evacuation device further includes a timer for measuring the heating time of the heater (320) and generating a second electrical signal after the time of the heater (320) reaches a preset heating time, and the control device is adapted to generate a shutdown instruction after receiving the second electrical signal, and the shutdown instruction is used to control the heater (320) and the air compressor (310) to shut down.

6. The evacuation device according to claim 1, wherein The temperature of the heated gas is 60°C - 80°C.

7. The vacuum extraction device according to claim 1, characterized in that, The number of the interfaces (100) is multiple, and multiple interfaces (100) are all connected to the heating assembly (300) and the vacuum pump assembly (200).

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

9. The vacuum extraction device according to any one of claims 1-8, characterized in that, The vacuum pump assembly (200) includes a first vacuum pump (210) and a second vacuum pump (220), the first vacuum pump (210) and the first vacuum pump (210) are both connected to the interface (100), and the exhaust pressure of the second vacuum pump (220) is less than the exhaust pressure of the first vacuum pump (210).

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

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