Refrigerant recovery equipment and control method thereof

Abstract

The invention discloses refrigerant recovery equipment and a control method thereof, and relates to the technical field of refrigerant recovery. The device comprises a recovery unit, a vibration assembly, a self-cleaning assembly and a valve assembly, the recovery unit comprises a recovery pipeline, and the vibration assembly is arranged on the outer surface of the recovery pipeline and used for stripping oil stains attached to the inner wall of the recovery pipeline. The self-cleaning assembly comprises a self-cleaning pipeline, and the self-cleaning pipeline communicates with the recycling pipeline and is used for conducting pipeline self-cleaning by introducing external airflow to purge the recycling pipeline. The valve assembly is arranged in the recovery pipeline and the self-cleaning pipeline so as to be used for pipeline switching when the operation mode of the refrigerant recovery equipment is changed. Therefore, on the basis that shutdown disassembly and cleaning are not needed, oil stains attached to the refrigerating machine recovery equipment can be cleaned, the cleaning convenience of the refrigerating machine recovery equipment is improved, the flow resistance in a recovery pipeline is reduced, and therefore the recovery efficiency of the refrigerating machine recovery equipment is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerant recovery, and particularly to a refrigerant recovery device and a control method thereof. Background Art

[0002] With the gradual enhancement of the public's environmental protection awareness, the demand for refrigerant recovery has also gradually increased. During the refrigerant recovery process, devices such as compressors are usually required to form a refrigerant recovery system for refrigerant treatment, such as removing impurities and moisture in the refrigerant.

[0003] However, due to the mutual solubility between the refrigerant and the compressor lubricating oil, the recovered refrigerant often contains a large amount of oil stains, such as compressor lubricating oil and other impurities. As a result, after the refrigerant recovery system is used multiple times, the inner wall of the pipeline is prone to adhering to oil stains, requiring frequent shutdown and disassembly for cleaning, and greatly reducing the recovery efficiency of the refrigerant recovery system. Summary of the Invention

[0004] In view of the problem that the inner wall of the pipeline of the recovery system is prone to adhering to oil stains and requires frequent shutdown for cleaning, the present invention is proposed to provide a refrigerant recovery device and a control method thereof that can overcome or at least partially solve the above problems.

[0005] Based on the first aspect of the present invention, there is provided a refrigerant recovery device, the device comprising: a recovery unit, the recovery unit comprising a recovery pipeline; a vibration assembly, the vibration assembly being disposed on the outer surface of the recovery pipeline for peeling off the oil stains adhering to the inner wall of the recovery pipeline; a self-cleaning assembly, the self-cleaning assembly comprising a self-cleaning pipeline, the self-cleaning pipeline being communicated with the recovery pipeline for introducing an external air flow to blow the recovery pipeline for pipeline self-cleaning; a valve assembly, the valve assembly being disposed in the recovery pipeline and the self-cleaning pipeline for pipeline switching during the operation mode transformation of the refrigerant recovery device.

[0006] An optional invention content, the recovery unit includes a first drying filter, a compressor, an oil separator, a heat exchanger, and a liquid storage tank. A communication is formed between every two adjacent devices among the first drying filter, the compressor, the oil separator, the heat exchanger, and the liquid storage tank through connecting pipes. The first drying filter is communicated with the recovery inlet of the recovery unit, so that the refrigerant flowing in from the recovery inlet sequentially passes through the first drying filter, the compressor, the oil separator, and the heat exchanger and enters the liquid storage tank for storage; the vibration assembly includes at least one vibrator, and the vibrator is installed on the outer surface of the recovery pipeline between the first drying filter and the recovery inlet; and / or, the vibrator is installed on the outer surface of the first drying filter; and / or, the vibrator is installed on the outer surface of the heat exchanger; and / or, the vibrator is installed on the outer surface of the recovery pipeline between the heat exchanger and the liquid storage tank.

[0007] An optional invention content, the connecting pipes are made of soft materials.

[0008] An optional invention content, the self-cleaning pipeline includes: a first cleaning pipeline, the first cleaning pipeline includes a self-cleaning air inlet, and the first cleaning pipeline is communicated with the air inlet of the compressor; a second cleaning pipeline, the second cleaning pipeline communicates the liquid inlet of the liquid storage tank with the first air port of the first drying filter, wherein the second air port of the first drying filter is communicated with the self-cleaning air outlet, so that the external air flow entering the first cleaning pipeline sequentially purges the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, and the first drying filter and then flows out from the self-cleaning air outlet; the valve assembly includes: a first cleaning valve, the first cleaning valve is arranged in the first cleaning pipeline to control the on-off of the air path of the self-cleaning air inlet; a second cleaning valve, the second cleaning valve is arranged in the second cleaning pipeline to control the on-off of the air path between the second cleaning pipeline and the first drying filter; a first recovery valve, the first recovery valve is arranged at the liquid inlet of the liquid storage tank to control the on-off of the liquid path of the liquid storage tank.

[0009] An optional invention content, where the recovery inlet serves as the self-cleaning air outlet; or, the self-cleaning pipeline further includes a third cleaning pipeline, which is connected to the second air port of the first drying filter, and the self-cleaning air outlet is arranged at the end of the third cleaning pipeline away from the first drying filter. The external air flow entering the first cleaning pipeline purges the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the first drying filter, and the third cleaning pipeline in sequence, and then flows out from the self-cleaning air outlet; the valve assembly further includes a third cleaning valve, which is arranged in the third cleaning pipeline to control the on-off of the air path of the self-cleaning air outlet; and a second recovery valve, which is arranged in the connecting pipeline between the second air port of the first drying filter and the recovery inlet to control the on-off of the air path of the recovery inlet.

[0010] An optional invention content, where the self-cleaning pipeline further includes a fourth cleaning pipeline, and the fourth cleaning pipeline is connected to the first cleaning pipeline and the third cleaning pipeline; the valve assembly includes: a pipeline reversing valve, which is arranged at the connection of the first cleaning pipeline, the recovery pipeline, and the fourth cleaning pipeline to switch the on-off of the air paths between the first cleaning pipeline and the fourth cleaning pipeline, between the first cleaning pipeline and the recovery pipeline, and between the fourth cleaning pipeline and the recovery pipeline through the pipeline reversing valve; a fourth cleaning valve, which is arranged in the fourth cleaning pipeline to control the on-off of the air path of the fourth cleaning pipeline; and a fifth cleaning valve, which is arranged between the first air port of the first drying filter and the second cleaning pipeline to control the on-off of the air path at the first air port of the first drying filter.

[0011] An optional invention content, where the self-cleaning assembly further includes a dirt collector, the air inlet of the dirt collector is connected to the second air port of the first drying filter, and the air outlet of the dirt collector serves as the self-cleaning air outlet.

[0012] An optional invention content, where the self-cleaning assembly further includes a second drying filter, and the second drying filter is arranged in the first cleaning pipeline to process the external air flow entering from the self-cleaning air inlet.

[0013] An optional invention content, where the refrigerant recovery device further includes at least one pressure detection element, and at least one pressure detection element is distributed in the recovery pipeline to detect the pressure distribution data in the recovery pipeline.

[0014] Based on the second aspect of the present invention, a control method is further provided. The refrigerant recovery device includes the refrigerant recovery device described in any one of the above-mentioned invention contents. The control method includes: obtaining the pressure distribution data in the recovery pipeline; when it is determined that the self-cleaning condition is satisfied according to the pressure distribution data, controlling the refrigerant recovery device to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the valve assembly to act to adjust the communication between the self-cleaning pipeline and the recovery pipeline, so as to introduce external air flow to purge the recovery pipeline for pipeline self-cleaning, and controlling the vibration assembly to vibrate to strip the oil stains attached to the inner wall of the recovery pipeline.

[0015] An optional invention content, the pressure distribution data includes a first pressure value detected at the second air port of the first drying filter and a second pressure value detected between the compressor and the first air port of the first drying filter; determining that the self-cleaning condition is satisfied according to the pressure distribution data includes: if the pressure difference between the first pressure value and the second pressure value is greater than or equal to a first pressure threshold, it is determined that the self-cleaning condition is satisfied; and / or, the pressure distribution data further includes a third pressure value detected between the compressor and the oil separator and a fourth pressure value detected between the heat exchanger and the liquid storage tank; determining that the self-cleaning condition is satisfied according to the pressure distribution data includes: if the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to a second pressure threshold, it is determined that the self-cleaning condition is satisfied.

[0016] An optional invention content, when the pressure difference between the first pressure value and the second pressure value is greater than or equal to the first pressure threshold and it is determined that the self-cleaning condition is satisfied, or when the pressure difference between the first pressure value and the second pressure value is greater than or equal to the first pressure threshold, and the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to the second pressure threshold and it is determined that the self-cleaning condition is satisfied, executing the self-cleaning mode includes: adjusting the switch state of the valve assembly so that the external air flow entering from the first cleaning pipeline sequentially flows through the second drying filter, the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the fourth cleaning pipeline and the self-cleaning air outlet; controlling the compressor and the vibration assembly to work; when it is detected that the pipeline replacement condition is reached, adjusting the switch state of the valve assembly so that the external air flow entering from the first cleaning pipeline sequentially flows through the second drying filter, the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the first drying filter and the self-cleaning air outlet; when it is detected that the cleaning stop condition is reached, stopping the compressor and the vibration assembly from working.

[0017] An optional invention content is that when the pressure difference between the first pressure value and the second pressure value is less than the first pressure threshold, and the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to the second pressure threshold, and it is determined that the self-cleaning condition is met, the execution of the self-cleaning mode includes: adjusting the on-off state of the valve assembly so that the external air flow entering from the first cleaning pipeline sequentially flows through the second drying filter, the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the fourth cleaning pipeline, and the self-cleaning air outlet; controlling the compressor and the vibration assembly to work; and stopping the compressor and the vibration assembly from working when it is detected that the cleaning stop condition is reached.

[0018] Compared with the prior art, the present invention includes a recovery unit, a vibration assembly, a self-cleaning assembly, and a valve assembly. The recovery unit includes a recovery pipeline, and the vibration assembly is arranged on the outer surface of the recovery pipeline to peel off the oil stains attached to the inner wall of the recovery pipeline. The self-cleaning assembly includes a self-cleaning pipeline, which is communicated with the recovery pipeline to clean the pipeline by introducing external air flow to blow the recovery pipeline. The valve assembly is arranged in the recovery pipeline and the self-cleaning pipeline to be used for pipeline switching during the operation mode transformation of the refrigerant recovery device. Thus, the oil stains attached to the refrigerant recovery device can be cleaned without shutting down and disassembling for cleaning, improving the cleaning convenience of the refrigerant recovery device, and reducing the flow resistance in the recovery pipeline, thereby greatly improving the recovery efficiency of the refrigerant recovery device.

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are specifically given. Description of the Drawings

[0020] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0021] In the drawings: Figure 1 It is a schematic diagram of the flow direction of the refrigerant when the refrigerant recovery device provided by the embodiment of the present invention operates in the self-cleaning mode; Figure 2 It is a schematic diagram of the air flow cleaning path when the refrigerant recovery device provided by the embodiment of the present invention operates in the recovery mode; Figure 3 It is a schematic diagram of the air flow cleaning path when another refrigerant recovery device provided by an embodiment of the present invention operates in the self-cleaning mode; Figure 4 It is a schematic diagram of the flow direction of the refrigerant when another refrigerant recovery device provided by an embodiment of the present invention operates in the recovery mode; Figure 5 It is a schematic diagram of the first air flow cleaning path when another refrigerant recovery device provided by an embodiment of the present invention operates in the self-cleaning mode; Figure 6 It is a schematic diagram of the second air flow cleaning path when another refrigerant recovery device provided by an embodiment of the present invention operates in the self-cleaning mode; Figure 7 It is a schematic diagram of the flow direction of the refrigerant when another refrigerant recovery device provided by an embodiment of the present invention operates in the recovery mode; Figure 8 It is a block diagram of the electrical connection structure of a refrigerant recovery device provided by an embodiment of the present invention; Figure 9 It is a schematic diagram of the step flow of a control method for a refrigerant recovery device provided by an embodiment of the present invention; Figure 10 It is a schematic diagram of the step flow of another control method for a refrigerant recovery device provided by an embodiment of the present invention; Reference numerals: 1, recovery unit; 101, recovery inlet; 11, first drying filter; 12, compressor; 13, oil separator; 14, heat exchanger; 15, liquid storage tank; 16, connecting pipe; 2, vibration assembly; 21, vibrator; 3, self-cleaning assembly; 301, self-cleaning air outlet; 31, first cleaning pipeline; 311, self-cleaning air inlet; 32, second cleaning pipeline; 33, third cleaning pipeline; 34, fourth cleaning pipeline; 35, dirt collector; 36, second drying filter; 4, valve assembly; 41, first cleaning valve; 42, second cleaning valve; 43, first recovery valve; 44, third cleaning valve; 45, second recovery valve; 46, pipeline reversing valve; 47, fourth cleaning valve; 48, fifth cleaning valve; 5, pressure detection element; 6, controller; 7, device to be recovered. Detailed Embodiments

[0022] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0023] With the gradual enhancement of the public's environmental awareness, the demand for refrigerant recovery has also gradually increased. During the refrigerant recovery process, devices such as compressors are usually required to form a refrigerant recovery system for refrigerant treatment, such as removing impurities and moisture in the refrigerant.

[0024] However, due to the mutual solubility between the refrigerant and the compressor lubricating oil, the recovered refrigerant often contains a lot of oil stains, such as compressor lubricating oil and other impurities. As a result, after the refrigerant recovery system is used multiple times, the inner wall of the pipeline is prone to adhering oil stains, requiring frequent shutdown and disassembly for cleaning, and greatly reducing the recovery efficiency of the refrigerant recovery system.

[0025] Based on the above technical problems, the embodiments of the present invention are proposed. The embodiments of the present invention may include a recovery unit 1, a vibration component 2, a self-cleaning component 3, and a valve component 4. The recovery unit 1 includes a recovery pipeline. The vibration component 2 is arranged on the outer surface of the recovery pipeline to peel off the oil stains adhering to the inner wall of the recovery pipeline. The self-cleaning component 3 includes a self-cleaning pipeline, and the self-cleaning pipeline is communicated with the recovery pipeline to perform pipeline self-cleaning by introducing external air flow to blow the recovery pipeline. The valve component 4 is arranged in the recovery pipeline and the self-cleaning pipeline to be used for pipeline switching when the operation mode of the refrigerant recovery device changes. Thus, on the basis of not requiring shutdown and disassembly for cleaning, the oil stains adhering to the refrigerant recovery device can be cleaned, improving the cleaning convenience of the refrigerant recovery device, and reducing the flow resistance in the recovery pipeline, thereby greatly improving the recovery efficiency of the refrigerant recovery device.

[0026] Refer to Figure 1-7 Accordingly, the embodiments of the present invention provide a refrigerant recovery device. The refrigerant recovery device may include a recovery unit 1, a vibration component 2, a self-cleaning component 3, and a valve component 4. The recovery unit 1 includes a recovery pipeline. The vibration component 2 is arranged on the outer surface of the recovery pipeline to peel off the oil stains adhering to the inner wall of the recovery pipeline. The self-cleaning component 3 includes a self-cleaning pipeline, and the self-cleaning pipeline is communicated with the recovery pipeline to perform pipeline self-cleaning by introducing external air flow to blow the recovery pipeline. The valve component 4 is arranged in the recovery pipeline and the self-cleaning pipeline to be used for pipeline switching when the operation mode of the refrigerant recovery device changes.

[0027] In an embodiment of the present invention, the recovery unit 1 can be understood as a set of a series of devices and pipelines required for refrigerant recovery. It is used to communicate with the device to be recovered 7 for refrigerant recovery. Among them, the device to be recovered 7 can be understood as a related electrical device with refrigerant. For example, the device to be recovered 7 can include but is not limited to related devices with refrigeration requirements such as refrigerators, freezers, air conditioning equipment, refrigeration units, cold drink machines, and ice makers.

[0028] When the vibration assembly 2 works, it can drive the related devices connected thereto to vibrate synchronously. For example, the vibration assembly 2 is arranged on the outer surface of the recovery pipeline, so that the vibration energy generated by the vibration assembly 2 can be used to peel off the oil stains attached to the inner wall of the recovery pipeline. For example, through vibration at a certain frequency, the oil film and impurities formed due to the attachment of lubricating oil on the inner wall of the recovery pipeline can be made to fall off.

[0029] The self-cleaning assembly 3 is used to purge the recovery pipeline of the recovery unit 1, so that the dirt in the recovery pipeline (such as residual oil film and / or impurities) can be collected and processed uniformly through the purging of external air flow, thereby realizing the self-cleaning of the recovery pipeline.

[0030] When pipeline self-cleaning is required, the pipeline connection state of the recovery pipeline and the self-cleaning pipeline is adjusted through the valve assembly 4, and through the mutual cooperation of the vibration assembly 2 and the self-cleaning assembly 3, the oil film and impurities attached to the inner wall of the recovery pipeline are peeled off and purged outside the recovery pipeline. Thus, through the mutual cooperation of the vibration assembly 2, the self-cleaning assembly 3, and the valve assembly 4, the oil stains attached to the refrigerant recovery device can be cleaned without the need to stop the machine for disassembly and cleaning. The cleaning convenience of the refrigerant recovery device is improved, the flow resistance in the recovery pipeline is reduced, and the recovery efficiency of the refrigerant recovery device is greatly improved.

[0031] In an optional embodiment of the invention, refer to Figure 1-Figure 7As shown, the recovery unit 1 includes a first drying filter 11, a compressor 12, an oil separator 13, a heat exchanger 14, and a liquid storage tank 15. A connection pipeline 16 is formed to connect every two adjacent devices among the first drying filter 11, the compressor 12, the oil separator 13, the heat exchanger 14, and the liquid storage tank 15. The first drying filter 11 is connected to the recovery inlet 101 of the recovery unit 1, so that the refrigerant flowing in from the recovery inlet 101 sequentially passes through the first drying filter 11, the compressor 12, the oil separator 13, and the heat exchanger 14, and then enters the liquid storage tank 15 for storage. The vibration assembly 2 includes at least one vibrator 21, and the vibrator 21 is installed on the outer surface of the recovery pipeline between the first drying filter 11 and the recovery inlet 101. And / or, the vibrator 21 is installed on the outer surface of the first drying filter 11. And / or, the vibrator 21 is installed on the outer surface of the heat exchanger 14. And / or, the vibrator 21 is installed on the outer surface of the recovery pipeline between the heat exchanger 14 and the liquid storage tank 15.

[0032] In the embodiment of the present invention, the recovery unit 1 may include devices such as a first drying filter 11, a compressor 12, an oil separator 13, a heat exchanger 14, and a liquid storage tank 15. On the one hand, the first drying filter 11 is used to adsorb the moisture in the refrigerant, and on the other hand, it can also filter the impurities in the refrigerant. For example, the impurities may include metal debris, oil stains, or dust and other substances. The compressor 12 is used to establish a pressure difference in the recovery pipeline and drive the refrigerant in the device to be recovered 7 to flow into the recovery pipeline. And the compressor 12 can compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. For example, the compressor 12 can be selected as an oil-free compressor 12 or the like.

[0033] The oil separator 13 is used to separate the lubricating oil doped in the refrigerant to prevent the lubricating oil from settling in the recovery pipeline. The heat exchanger 14 can be used to cool the high-temperature and high-pressure gaseous refrigerant flowing out of the oil separator 13, so as to convert the high-temperature and high-pressure gaseous refrigerant into a liquid refrigerant, which is convenient for the liquid refrigerant to flow into the liquid storage tank 15 for storage. In one or more embodiments, the heat exchanger 14 may include an air-cooled heat exchanger 14 and / or a water-cooled heat exchanger 14 or the like.

[0034] Between the first drying filter 11 and the recovery inlet 101 of the recovery unit 1, between the first drying filter 11 and the compressor 12, between the compressor 12 and the oil separator 13, between the oil separator 13 and the heat exchanger 14, and between the heat exchanger 14 and the liquid storage tank 15, connecting pipes 16 can be respectively used to form a connection. In other words, the recovery pipeline of the recovery unit 1 can be understood as a combination of the pipeline inside multiple connecting pipes 16 and the device pipelines in different devices for refrigerant recovery and treatment. Thus, when the refrigerant recovery device operates in the recovery mode, the refrigerant flows from the device to be recovered 7 into the recovery inlet 101 and sequentially flows through the first drying filter 11, the compressor 12, the oil separator 13, the heat exchanger 14, and the liquid storage tank 15.

[0035] The vibration assembly 2 can include at least one vibrator 21. Among them, the vibrator 21 can include: an ultrasonic generator and / or a piezoelectric ceramic transducer. For example, when the vibrator 21 uses an ultrasonic generator, the operating frequency of the vibrator 21 can be between 20 kHz and 40 kHz (including 20 kHz and 40 kHz), and an intermittent pulse mode (duty cycle is 50 ), to periodically excite the ultrasonic cavitation effect, thereby improving the oil stain stripping effect of the vibrator 21.

[0036] In one or more embodiments, the vibrator 21 can be installed on the outer surface of the recovery pipeline between the first drying filter 11 and the recovery inlet 101. The recovery inlet 101 is used to communicate with the device to be recovered 7. Thus, the oil film and impurities attached to the inner pipe wall of the connecting pipe 16 between the first drying filter 11 and the recovery inlet 101 can be vibrationally stripped.

[0037] In one or more embodiments, the vibrator 21 can be installed on the outer surface of the first drying filter 11. The inside of the first drying filter 11 serves as the device pipeline of the recovery pipeline. Through the surface contact between the vibrator 21 and the outer surface of the first drying filter 11, the oil film and impurities attached to the inside of the first drying filter 11 can be vibrationally stripped.

[0038] In one or more embodiments, the vibrator 21 can be installed on the outer surface of the heat exchanger 14. The inside of the heat exchanger 14 serves as the device pipeline of the recovery pipeline. Through the surface contact between the vibrator 21 and the outer surface of the heat exchanger 14, the oil film and impurities attached to the inside of the heat exchanger 14 can be vibrationally stripped.

[0039] In one or more embodiments, the vibrator 21 may be installed on the outer surface of the recovery pipeline between the heat exchanger 14 and the liquid storage tank 15. Thus, the oil film and impurities adhering to the inner pipe wall of the connecting pipe 16 between the heat exchanger 14 and the liquid storage tank 15 can be vibrationally peeled off.

[0040] In summary, when the vibration assembly 2 includes one vibrator 21, the vibrator 21 can be installed at any of the above positions. When the vibration assembly 2 includes at least two vibrators 21, at least two of the above four installation areas can be selected according to actual design requirements for installing the vibrator 21. That is, at least two of the vibrators 21 are spaced apart along the recovery pipeline. No further limitation is made here.

[0041] In an alternative embodiment of the invention, the connecting pipe 16 is made of a soft material.

[0042] In the embodiment of the present invention, the connecting pipe 16 made of a soft material can avoid affecting the operating performance of the compressor 12 due to the structural stiffness of the connecting pipe 16 itself when the vibrator 21 vibrates. Thereby, the operating stability of the refrigerant recovery device is improved, and the service life of the compressor 12 is extended.

[0043] In an alternative embodiment of the invention, referring to Figure 1 and Figure 2 as shown, the self-cleaning pipeline may include a first cleaning pipeline 31 and a second cleaning pipeline 32. The first cleaning pipeline 31 includes a self-cleaning air inlet 311, and the first cleaning pipeline 31 is communicated with the air inlet of the compressor 12. The second cleaning pipeline 32 communicates the liquid inlet of the liquid storage tank 15 with the first air port of the first drying filter 11. Wherein, the second air port of the first drying filter 11 is communicated with the self-cleaning air outlet 301, so that the external air flow entering the first cleaning pipeline 31 sequentially purges the compressor 12, the oil separator 13, the heat exchanger 14, the second cleaning pipeline 32, and the first drying filter 11, and then flows out from the self-cleaning air outlet 301.

[0044] The valve assembly 4 may include a first cleaning valve 41, a second cleaning valve 42, a first recovery valve 43, and a second recovery valve 45. The first cleaning valve 41 is disposed in the first cleaning pipeline 31 to control the on-off of the air path of the self-cleaning air inlet 311. The second cleaning valve 42 is disposed in the second cleaning pipeline 32 to control the on-off of the air path between the second cleaning pipeline 32 and the first drying filter 11. The first recovery valve 43 is disposed at the liquid inlet of the liquid storage tank 15 to control the on-off of the liquid path of the liquid storage tank 15.

[0045] In an embodiment of the present invention, the self-cleaning pipeline may include at least two cleaning pipelines. For example, the self-cleaning pipeline may include a first cleaning pipeline 31 and a second cleaning pipeline 32. One end of the first cleaning pipeline 31 serves as the self-cleaning air inlet 311 of the self-cleaning pipeline, which is used to introduce external air flow. The other end of the first cleaning pipeline 31 is communicated with the air inlet of the compressor 12. For example, the other end of the first cleaning pipeline 31 may form an air path connection with the connecting pipeline 16 located between the compressor 12 and the first dry filter 11. Thus, when the refrigerant recovery device operates in the self-cleaning mode, the valve assembly 4 can be used to control the air path between the first cleaning pipeline 31 and the compressor 12 to be communicated, so that the external air flow flows into the compressor 12 for compression, and then sequentially passes through the oil separator 13 and the heat exchanger 14.

[0046] The second cleaning pipeline 32 communicates the liquid inlet of the liquid storage tank 15 with the first air port of the first dry filter 11. That is to say, when the refrigerant recovery device operates in the self-cleaning mode, the valve assembly 4 can be used to control the external air flow to pass through the second cleaning pipeline 32 and flow into the first dry filter 11, and after passing through the first dry filter 11, it flows out from the self-cleaning air outlet 301. Thus, through the cooperation of the vibration assembly 2 and the self-cleaning assembly 3, the stripping and cleaning of the oil stains in the device pipelines of the compressor 12, the oil separator 13, the heat exchanger 14, and the first dry filter 11, and the pipeline between different devices can be completed sequentially.

[0047] In one or more embodiments, the valve assembly 4 may include a first cleaning valve 41, a second cleaning valve 42, a first recovery valve 43, and a second recovery valve 45. Among them, the first cleaning valve 41 is arranged in the first cleaning pipeline 31 to control the on-off of the air path of the self-cleaning air inlet 311. For example, when the refrigerant recovery device operates in the recovery mode, the first cleaning valve 41 is controlled to close the self-cleaning air inlet 311. When the refrigerant recovery device operates in the self-cleaning mode, the first cleaning valve 41 is controlled to open the self-cleaning air inlet 311.

[0048] The second cleaning valve 42 is disposed in the second cleaning pipeline 32 to control the on-off of the gas path between the second cleaning pipeline 32 and the first drying filter 11. The first recovery valve 43 is used to control the on-off of the liquid path of the liquid storage tank 15. For example, when the refrigerant recovery device operates in the recovery mode, the second cleaning valve 42 is controlled to close, and the first recovery valve 43 is controlled to open. Thus, the refrigerant flowing out of the heat exchanger 14 can flow to the liquid storage tank 15 for storage. When the refrigerant recovery device operates in the self-cleaning mode, the first recovery valve 43 can be controlled to close, and the second cleaning valve 42 can be controlled to open. The oil stain blown out from the heat exchanger 14 will not enter the liquid storage tank 15, but will flow through the second cleaning pipeline 32 and flow into the first drying filter 11.

[0049] In one or more embodiments, referring to Figure 1 as shown, the recovery inlet 101 can directly serve as the self-cleaning air outlet 301. Thus, when the refrigerant recovery device operates in the self-cleaning mode, the device to be recovered 7 communicated with the recovery inlet 101 can be replaced with a dirt collection device. Then, when the vibration assembly 2 works, the first cleaning valve 41, the second cleaning valve 42, and the first recovery valve 43 can be controlled to act, so that the external air flow sequentially blows the compressor 12, the oil separator 13, the heat exchanger 14, the first drying filter 11, and the recovery inlet 101 to complete the cleaning of the oil stain in the recovery unit 1. On the basis of not requiring shutdown for disassembling and cleaning each device and the connecting pipeline 16, the attached oil stain in the refrigeration machine recovery device can be cleaned. The cleaning convenience of the refrigeration machine recovery device is improved, the flow resistance in the recovery pipeline is reduced, and the recovery efficiency of the refrigerant recovery device is greatly improved.

[0050] In one or more embodiments, referring to Figure 3 and Figure 4As shown, the self-cleaning pipeline may further include a third cleaning pipeline 33, and the third cleaning pipeline 33 is communicated with the second air port of the first drying filter 11. That is to say, the self-cleaning air outlet 301 may be arranged at the end of the third cleaning pipeline 33 far away from the first drying filter 11. The valve assembly 4 may further include a third cleaning valve 44 and a second recovery valve 45. Among them, the third cleaning valve 44 is installed in the third cleaning pipeline 33 to control the on-off of the air path of the self-cleaning air outlet 301. The second recovery valve 45 is arranged in the connecting pipeline 16 between the first drying filter 11 and the recovery inlet 101 to control the on-off of the air path of the recovery inlet 101. Thus, when the refrigerant recovery device operates in the self-cleaning mode, the second recovery valve 45 can be controlled to act to close the recovery inlet 101, and the third cleaning valve 44 can be controlled to act to open the self-cleaning inlet. Thus, the oil stain blown out from the first drying filter 11 can be prevented from entering the device 7 to be recovered and flowing into the third cleaning pipeline 33.

[0051] In an optional embodiment of the invention, the recovery inlet 101 serves as the self-cleaning air outlet 301. Alternatively, the self-cleaning pipeline further includes a third cleaning pipeline 33, which communicates with the second air port of the first drying filter 11. The self-cleaning air outlet 301 is arranged at the end of the third cleaning pipeline 33 far away from the first drying filter 11. The external air flow entering the first cleaning pipeline 31 blows through the compressor 12, the oil separator 13, the heat exchanger 14, the second cleaning pipeline 32, the first drying filter 11 and the third cleaning pipeline 33 in sequence, and then flows out from the self-cleaning air outlet 301. The valve assembly 4 further includes a third cleaning valve 44, and the third cleaning valve 44 is arranged in the third cleaning pipeline 33 to control the on-off of the air path of the self-cleaning air outlet 301.

[0052] In an optional embodiment of the invention, with reference to Figure 5 , Figure 6 and Figure 7As shown, the self-cleaning pipeline further includes a fourth cleaning pipeline 34, and the fourth cleaning pipeline 34 communicates with the first cleaning pipeline 31 and the third cleaning pipeline 33. The valve assembly 4 may include a pipeline reversing valve 46, a fourth cleaning valve 47, and a fifth cleaning valve 48. The pipeline reversing valve 46 is disposed at the connection of the first cleaning pipeline 31, the recovery pipeline, and the fourth cleaning pipeline 34 to switch the on-off of the gas path between the first cleaning pipeline 31 and the fourth cleaning pipeline 34, between the first cleaning pipeline 31 and the recovery pipeline, and between the fourth cleaning pipeline 34 and the recovery pipeline through the pipeline reversing valve 46. The fourth cleaning valve 47 is disposed in the fourth cleaning pipeline 34 to control the on-off of the gas path of the fourth cleaning pipeline 34. The fifth cleaning valve 48 is disposed between the first gas port of the first dry filter 11 and the second cleaning pipeline 32 to control the on-off of the gas path at the first gas port of the first dry filter 11.

[0053] In the embodiment of the present invention, the pipeline reversing valve 46 may be selected from types such as a four-way reversing valve, and it may be disposed at the connection of the first cleaning pipeline 31, the recovery pipeline, and the fourth cleaning pipeline 34. For example, the pipeline reversing valve 46 at least includes a first interface, a second interface, a third interface, and a fourth interface. Among them, the first interface communicates with the first cleaning pipeline 31, the second interface communicates with the intake port of the compressor 12, the third interface communicates with the first gas port of the first dry filter 11, and the fourth interface communicates with the fourth cleaning pipeline 34. When the refrigerant recovery device is in the recovery mode, the first interface of the pipeline reversing valve 46 communicates with the fourth interface, and the second interface communicates with the third interface, so that the refrigerant flowing out of the first dry filter 11 flows into the compressor 12.

[0054] When the refrigerant recovery device is in the self-cleaning mode, the first interface of the pipeline reversing valve 46 communicates with the second interface, and the third interface communicates with the fourth interface, so that the external air flow in the first cleaning pipeline 31 flows into the compressor 12.

[0055] In one or more embodiments, considering that there may be oil stains in the heat exchanger 14 when the first drying filter 11 is purged in the reverse direction, which may contaminate the first drying filter 11. Thus, when the refrigerant recovery device is in the self-cleaning mode, the fifth cleaning valve 48 can be controlled to close the gas path at the first gas port of the first drying filter 11, and the fourth cleaning valve 47 can be controlled to act so that the gas path of the fourth cleaning pipeline 34 is connected. Thereby, the oil stain flowing into the second cleaning pipeline 32 from the heat exchanger 14 flows into the fourth communication pipeline connected thereto. Then it flows through the fourth communication pipeline into the third cleaning pipeline 33, and finally is discharged from the self-cleaning air outlet 301 of the third cleaning pipeline 33.

[0056] In some embodiments, after the self-cleaning mode runs for a period of time, the fourth cleaning valve 47 is closed and then the fifth cleaning valve 48 is opened, so that the oil stains in the first drying filter 11 and the connecting pipeline 16 between the first drying filter 11 and the recovery inlet 101 can be cleaned.

[0057] In an alternative embodiment of the invention, refer to Figure 5 , Figure 6 and Figure 7 As shown, the self-cleaning assembly 3 further includes a dirt collector 35. The air inlet of the dirt collector 35 is communicated with the second gas port of the first drying filter 11, and the air outlet of the dirt collector 35 serves as the self-cleaning air outlet 301.

[0058] In the embodiment of the present invention, the dirt collector 35 refers to a device for intercepting oil stains such as lubricating oil and / or particulate impurities. The air inlet of the dirt collector 35 can be communicated with the second gas port of the first drying filter 11. Thus, the oil stains purged from the first drying filter 11 can be processed, and the processed air flow is discharged outside the dirt collector. The air outlet of the dirt collector 35 directly serves as the self-cleaning air outlet 301, so that the processed air flow can be directly discharged into the external environment where the refrigerant recovery device is located.

[0059] In one or more embodiments, the air inlet of the dirt collector 35 can also be communicated with the fourth cleaning pipeline 34, so that the oil stain flowing into the second cleaning pipeline 32 from the heat exchanger 14 flows through the fourth cleaning pipeline 34 into the dirt collector 35 for oil stain collection, and then is discharged into the external environment where the refrigerant recovery device is located through the air outlet of the dirt collector 35.

[0060] In an alternative embodiment of the invention, refer to Figure 5 , Figure 6 andFigure 7 As shown, the self-cleaning component 3 further includes a second drying filter 36, and the second drying filter 36 is disposed in the first cleaning pipeline to process the external air flow entering from the self-cleaning air inlet 311.

[0061] In an embodiment of the present invention, the second drying filter 36 is used to filter impurities and moisture in the external air flow, so as to avoid introducing impurities and moisture and reduce the recovery quality of the refrigerant in the recovery mode.

[0062] In an alternative embodiment of the invention, with reference to Figure 1-Figure 7 As shown, the refrigerant recovery device further includes at least one pressure detection element 5, and the at least one pressure detection element 5 is distributed in the recovery pipeline to detect the pressure distribution data in the recovery pipeline.

[0063] In an embodiment of the present invention, the pressure detection element 5 may include, but is not limited to, a strain type pressure sensor, a vibrating wire pressure sensor, a piezoelectric pressure sensor and other elements. The at least one pressure detection element 5 is distributed in the recovery pipeline to detect the pressure distribution data in the recovery pipeline, wherein the pressure distribution data may include at least one pipeline pressure value in the recovery pipeline. Thus, it is possible to determine whether to operate the self-cleaning mode according to the comparison result of the pipeline pressure values before and after. For example, when there is a lot of oil stain attached to the inner wall of the recovery pipeline, it will affect the flow resistance of the refrigerant in the recovery pipeline and the pressure change in the same pipeline area. Thus, it is possible to determine whether to operate the self-cleaning mode according to the actually measured pressure change value. Thus, the self-cleaning of the refrigerant recovery device can be carried out in time, and the recovery efficiency of the refrigerant is improved.

[0064] In summary, an embodiment of the present invention discloses a refrigerant recovery device, which may include a recovery unit 1, a vibration component 2, a self-cleaning component 3 and a valve component 4. The recovery unit 1 includes a recovery pipeline, and the vibration component 2 is disposed on the outer surface of the recovery pipeline to peel off the oil stain attached to the inner wall of the recovery pipeline. The self-cleaning component 3 includes a self-cleaning pipeline, and the self-cleaning pipeline is communicated with the recovery pipeline to perform pipeline self-cleaning by introducing external air flow to blow the recovery pipeline. The valve component 4 is disposed in the recovery pipeline and the self-cleaning pipeline to be used for pipeline switching during the operation mode transformation of the refrigerant recovery device. Thus, on the basis of not requiring shutdown and disassembly for cleaning, the oil stain attached to the refrigerant recovery device can be cleaned, the cleaning convenience of the refrigerant recovery device is improved, and the flow resistance in the recovery pipeline is reduced, thereby greatly improving the recovery efficiency of the refrigerant recovery device.

[0065] In some embodiments, with reference to Figure 8 As shown, the refrigerant recovery device may further include a controller 6, and the recovery unit 1, the vibration assembly 2, the valve assembly 4, and the pressure detection element 5 are respectively electrically connected to the controller 6. Thus, the controller 6 can control the actions of the recovery unit 1, the vibration assembly 2, and the valve assembly 4 based on the pressure distribution data detected by the pressure detection element 5. Thereby, the switching between the recovery mode and the self-cleaning mode is achieved.

[0066] With reference to Figure 9 As shown, an embodiment of the present invention also provides a control method for a refrigerant recovery device, and the control method may include: S901. Obtain the pressure distribution data in the recovery pipeline.

[0067] S902. When it is determined that the self-cleaning condition is satisfied according to the pressure distribution data, control the refrigerant recovery device to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the valve assembly 4 to act to adjust the self-cleaning pipeline to communicate with the recovery pipeline for introducing external air flow to purge the recovery pipeline for pipeline self-cleaning, and controlling the vibration assembly 2 to vibrate to strip the oil stains attached to the inner wall of the recovery pipeline.

[0068] In an embodiment of the present invention, the pressure distribution data at least includes a pipeline pressure value detected by the pressure detection element 5. The self-cleaning condition can be understood as a pressure-related condition for determining whether the device runs in the self-cleaning mode. In one example, when it is determined according to the pressure distribution data that the pressure value corresponding to a point in the recovery pipeline satisfies a set threshold, or when it is determined according to the pressure distribution data that the pressure difference between two points on the recovery pipeline satisfies the set threshold, it can be determined that the self-cleaning condition is satisfied. Thus, control the refrigerant recovery device to execute the self-cleaning mode. Among them, according to the working description content of the refrigerant recovery device in the above embodiment, the controller 6 can control the valve assembly 4 to act to adjust the self-cleaning pipeline to communicate with the recovery pipeline. And control the vibration assembly 2 to vibrate, so that under the vibration action of the vibration assembly 2, the oil stains attached to the inner wall of the recovery pipeline can be vibrated and stripped, and the stripped oil stains can be purged by external air flow, thereby realizing the self-cleaning of the recovery pipeline.

[0069] In one example, the purge power of the external air flow can be provided by the compressor 12 of the recovery unit 1 in the recovery pipeline and the self-cleaning pipeline. Thus, through the high-pressure air flow purged by the compressor 12 of the compressor 12, the oil stains attached to the inner wall of the recovery pipeline can be quickly peeled off. Therefore, when executing the self-cleaning mode, it further includes: controlling the compressor 12 to operate to compress the external air flow entering the self-cleaning air inlet 311. For example, the external air flow can be external air or nitrogen with a relatively high purity.

[0070] In other embodiments, those skilled in the art can also install a power source such as an air pump in the relevant pipeline to provide the purge power of the external air flow, which will not be limited here too much.

[0071] Referring to Figure 10 As shown, the embodiment of the present invention further provides another control method for a refrigerant recovery device, and the control method may include: S1001. Obtain the pressure distribution data in the recovery pipeline, where the pressure distribution data includes the first pressure value detected at the second air port of the first drying filter 11, the second pressure value detected between the compressor 12 and the first air port of the first drying filter 11, the third pressure value detected between the compressor 12 and the oil separator 13, and the fourth pressure value detected between the heat exchanger 14 and the liquid storage tank 15.

[0072] In the embodiment of the present invention, the pressure distribution data at least includes one pipeline pressure value detected by the pressure detection element 5. The self-cleaning condition can be understood as the pressure-related condition for determining whether the device runs the self-cleaning mode. In one example, when it is determined according to the pressure distribution data that the pressure value corresponding to a point in the recovery pipeline satisfies the set threshold, or when it is determined according to the pressure distribution data that the pressure difference between the two points corresponding to the recovery pipeline satisfies the set threshold, it can be determined that the self-cleaning condition is met. Thus, control the refrigerant recovery device to execute the self-cleaning mode.

[0073] In some embodiments, the refrigerant recovery device may include four pressure detection elements 5. The first pressure detection element 5 (such as Figure 7 P1 in) is arranged at the second air port of the first drying filter 11 to detect the first pressure value of the recovery pipeline. The second pressure detection element 5 (such as Figure 7 P2 in) is arranged between the compressor 12 and the first air port of the first drying filter 11 to detect the second pressure value of the recovery pipeline. The third pressure detection element 5 (such as Figure 7The third pressure detecting element 5 (such as P3 in Figure 7 ) is arranged between the compressor 12 and the oil separator 13, and the third pressure value of the recovery pipeline is detected. The fourth pressure detecting element 5 (such as P4 in

[0074] S1002. Determine whether the pressure difference between the first pressure value and the second pressure value is greater than or equal to a first pressure threshold.

[0075] In the embodiment of the present invention, the first pressure threshold can be understood as a pressure critical value for determining whether there is oil stain accumulation in the front-stage recovery pipeline of the compressor 12 (that is, the recovery pipeline between the recovery inlet 101 and the air inlet of the compressor 12). If the pressure difference between the first pressure value and the second pressure value is less than the first pressure threshold, it is determined that there is no oil stain accumulation in the front-stage recovery pipeline of the compressor 12. That is to say, at this time, the refrigerant recovery device does not need to execute the self-cleaning mode. Thus, the following step S1003 is executed. If the pressure difference between the first pressure value and the second pressure value is greater than or equal to the first pressure threshold, it is determined that there is oil stain accumulation in the front-stage recovery pipeline of the compressor 12. That is to say, at this time, the refrigerant recovery device needs to execute the self-cleaning mode to realize the oil stain cleaning of the front-stage recovery pipeline of the compressor 12. Thus, the following step S1004 is executed.

[0076] S1003. Determine whether the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to a second pressure threshold.

[0077] In the embodiment of the present invention, the second pressure threshold can be understood as a pressure critical value for determining whether there is oil stain accumulation in the rear-stage recovery pipeline of the compressor 12 (that is, the recovery pipeline between the air outlet of the compressor 12 and the liquid storage tank 15). If the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to the second pressure threshold, it is determined that there is oil stain accumulation in the rear-stage recovery pipeline of the compressor 12. That is to say, at this time, the refrigerant recovery device needs to execute the self-cleaning mode to realize the oil stain cleaning of the rear-stage recovery pipeline of the compressor 12. Thus, the following step S1004 is executed.

[0078] If the pressure difference between the third pressure value and the fourth pressure value is less than the second pressure threshold, it is determined that there is no oil stain accumulation in the rear-stage recovery pipeline of the compressor 12. That is to say, at this time, the refrigerant recovery device does not need to execute the self-cleaning mode, and thus the above step 1001 is repeatedly executed.

[0079] S1004. Determine that the self-cleaning condition is met, and control the refrigerant recovery device to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the valve assembly 4 to act to adjust the self-cleaning pipeline and the recovery pipeline to form a connection, so as to introduce external air flow to purge the recovery pipeline for pipeline self-cleaning, and controlling the vibration assembly 2 to vibrate to strip the oil stains attached to the inner wall of the recovery pipeline.

[0080] S1005. When it is detected that the cleaning condition is reached, stop the compressor 12 and the vibration assembly 2 from working.

[0081] In the embodiment of the present invention, when it is determined that the self-cleaning condition is met, the controller 6 controls the refrigeration recovery device to execute the self-cleaning mode. Among them, executing the self-cleaning mode may include: controlling the valve assembly 4 to act to adjust the self-cleaning pipeline and the recovery pipeline to form a connection, so as to introduce external air flow to purge the recovery pipeline for pipeline self-cleaning, and controlling the vibration assembly 2 to vibrate to strip the oil stains attached to the inner wall of the recovery pipeline.

[0082] Since there are differences in the specific technical solutions for meeting the self-cleaning condition, correspondingly, the specific steps of executing the self-cleaning mode may also be different. For example, the technical solution corresponding to meeting the self-cleaning condition is: when the pressure difference between the first pressure value and the second pressure value is less than the first pressure threshold, and the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to the second pressure threshold, it can be determined that there is no oil stain accumulation in the front-section recovery pipeline of the compressor 12, and there is oil stain accumulation in the rear-section recovery pipeline of the compressor 12. Therefore, the switch state of the valve assembly 4 can be adjusted so that the external air flow entering from the first cleaning pipeline 31 sequentially flows through the second drying filter 36, the compressor 12, the oil separator 13, the heat exchanger 14, the second cleaning pipeline 32, the fourth cleaning pipeline 34, and the self-cleaning air outlet 301. And control the compressor 12 and the vibration assembly 2 located in the rear-section recovery pipeline to work. Thus, the oil stains attached to the rear-section recovery pipeline of the compressor 12 can be vibrated and stripped and purged.

[0083] Moreover, when the pressure difference between the third pressure value and the fourth pressure value is less than the second pressure threshold, or when the operating duration of the compressor 12 reaches the first preset duration, it is determined that the refrigerant recovery device reaches the cleaning stop condition. At this time, stop the compressor 12 and the vibration assembly 2 from working, and the switch state of the valve assembly 4 can be reset to the initial state. For example, the initial state of the valve assembly 4 may be the switch states of the respective valves corresponding to when the refrigerant recovery device operates in the recovery mode.

[0084] In some other embodiments, the technical means corresponding to satisfying the self-cleaning condition is that the pressure difference between the first pressure value and the second pressure value is greater than or equal to a first pressure threshold. Alternatively, when the pressure difference between the first pressure value and the second pressure value is greater than or equal to the first pressure threshold, and the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to a second pressure threshold, it can be determined that there is oil stain accumulation in the front-stage recovery pipeline of the compressor 12, or that there is oil stain accumulation in both the front-stage and rear-stage recovery pipelines of the compressor 12. At this time, in order to prevent the oil stain in the rear-stage recovery pipeline from entering the first drying filter 11 during the purging process and contaminating the first drying filter 11. First, the switch state of the valve assembly 4 can be adjusted so that the external air flow entering from the first cleaning pipeline 31 sequentially flows through the second drying filter 36, the compressor 12, the oil separator 13, the heat exchanger 14, the second cleaning pipeline 32, the fourth cleaning pipeline 34, and the self-cleaning air outlet 301. And the compressor 12 and the vibration assembly 2 located in the rear-stage recovery pipeline are controlled to operate. Thereby, the oil stain attached to the rear-stage recovery pipeline of the compressor 12 can be vibrated and stripped and purged.

[0085] When the pressure difference between the third pressure value and the fourth pressure value is less than the second pressure threshold, or when the operating duration of the compressor 12 reaches a second preset duration (the first preset duration and the second preset duration can be the same), it is determined that the refrigerant recovery device reaches the pipeline replacement condition. For example, the first preset duration can be 3 minutes or the like, and no more limitations are made here. At this time, the switch state of the valve assembly 4 is adjusted so that the external air flow entering from the first cleaning pipeline 31 sequentially flows through the second drying filter 36, the compressor 12, the oil separator 13, the heat exchanger 14, the second cleaning pipeline 32, the first drying filter 11, and the self-cleaning air outlet 301. Thus, the oil stain attached to the front-stage recovery pipeline of the compressor 12 can be vibrated and stripped and purged.

[0086] In one or more embodiments, when the pressure difference between the first pressure value and the second pressure value is less than the first pressure threshold, or when the operating duration of the compressor 12 reaches the first preset duration, it is determined that the refrigerant recovery device reaches the cleaning stop condition. At this time, the compressor 12 and the vibration assembly 2 are stopped, and the switch state of the valve assembly 4 can be reset to the initial state. For example, the initial state of the valve assembly 4 can be the switch state of each valve corresponding to the refrigerant recovery device operating in the recovery mode.

[0087] When the refrigerant recovery device operates in the recovery mode, the refrigerant flowing out of the device 7 to be recovered can sequentially flow through the first drying filter 11, the compressor 12, the oil separator 13, the heat exchanger 14, and the liquid storage tank 15. When the first pressure value is less than or equal to the third pressure threshold, the operation of the compressor 12 is stopped. The third pressure threshold can be understood as the pressure critical value affecting the service life of the compressor 12. For example, the third pressure threshold can be a value such as 0.1 MPa. No further limitation is made here.

[0088] In some embodiments, the pressure difference between the first pressure value and the second pressure value, and the pressure difference between the third pressure value and the fourth pressure value can be comprehensively determined according to the length, diameter, etc. of the connecting pipeline 16. For example, the pressure difference can be a value such as 0.2 MPa. No further limitation is made here.

[0089] In the embodiments of the present invention, the control logic in the embodiments of the present invention can be adapted by increasing or decreasing the number of valves in the valve assembly 4, or the position of the relevant valves in the pipeline. No further limitation is made here.

[0090] In summary, the embodiments of the present invention disclose a control method for a refrigerant recovery device. The control method may include first obtaining the pressure distribution data in the recovery pipeline, and then controlling the refrigerant recovery device to execute the self-cleaning mode when it is determined according to the pressure distribution data that the self-cleaning condition is satisfied. Executing the self-cleaning mode includes: controlling the valve assembly 4 to act to adjust the self-cleaning pipeline to form a connection with the recovery pipeline, so as to introduce external air flow to blow the recovery pipeline for pipeline self-cleaning, and controlling the vibration assembly 2 to vibrate, so as to peel off the oil stains attached to the inner wall of the recovery pipeline. Thus, through the mutual cooperation of the vibration assembly 2, the self-cleaning assembly 3, and the valve assembly 4, the oil stains attached to the refrigerant recovery device can be cleaned without stopping the machine for disassembly and cleaning. The cleaning convenience of the refrigerant recovery device is improved, the flow resistance in the recovery pipeline is reduced, and the recovery efficiency of the refrigerant recovery device is greatly improved.

[0091] Each embodiment in this specification is described in a progressive manner. The key points of each embodiment are the differences from other embodiments. The same and similar parts among the embodiments can be referred to each other.

[0092] It is easy for those skilled in the art to think that any combination application of the above-mentioned various embodiments is feasible. Therefore, any combination of the above-mentioned various embodiments is an implementation scheme of the present invention. However, due to space limitations, this specification does not elaborate on them one by one here.

[0093] In the specification provided herein, a number of specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail so as not to obscure an understanding of the present specification.

[0094] Similarly, it should be understood that, in order to streamline the present invention and assist in understanding one or more of the various inventive aspects, in the foregoing description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof.

[0095] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not others, combinations of features of different embodiments are meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

Claims

1. A refrigerant recovery device, characterized in that, The refrigerant recovery device includes: a recovery unit, the recovery unit including a recovery pipeline; a vibration assembly, the vibration assembly being disposed on the outer surface of the recovery pipeline for peeling off the oil stains adhering to the inner wall of the recovery pipeline; a self-cleaning assembly, the self-cleaning assembly including a self-cleaning pipeline, the self-cleaning pipeline being communicated with the recovery pipeline for self-cleaning the pipeline by introducing external air flow to blow the recovery pipeline; a valve assembly, the valve assembly being disposed in the recovery pipeline and the self-cleaning pipeline for pipeline switching during the operation mode transformation of the refrigerant recovery device.

2. The refrigerant recovery device according to claim 1, characterized in that, The recovery unit includes a first drying filter, a compressor, an oil separator, a heat exchanger and a liquid storage tank. A communication is formed between every two adjacent devices among the first drying filter, the compressor, the oil separator, the heat exchanger and the liquid storage tank through a connecting pipeline. The first drying filter is communicated with the recovery inlet of the recovery unit, so that the refrigerant flowing in from the recovery inlet sequentially passes through the first drying filter, the compressor, the oil separator and the heat exchanger and enters the liquid storage tank for storage; The vibration assembly includes at least one vibrator, and the vibrator is installed on the outer surface of the recovery pipeline between the first drying filter and the recovery inlet; and / or, the vibrator is installed on the outer surface of the first drying filter; and / or, the vibrator is installed on the outer surface of the heat exchanger; and / or, the vibrator is installed on the outer surface of the recovery pipeline between the heat exchanger and the liquid storage tank.

3. The refrigerant recovery device according to claim 2, wherein, The connecting pipeline is made of a soft material.

4. The refrigerant recovery device according to claim 2, characterized in that, The self-cleaning pipeline includes: a first cleaning pipeline, the first cleaning pipeline including a self-cleaning air inlet, and the first cleaning pipeline being communicated with the air inlet of the compressor; a second cleaning pipeline, the second cleaning pipeline communicating the liquid inlet of the liquid storage tank with the first air port of the first drying filter. Wherein, the second air port of the first drying filter is communicated with the self-cleaning air outlet, so that the external air flow entering the first cleaning pipeline sequentially blows the compressor, the oil separator, the heat exchanger, the second cleaning pipeline and the first drying filter and then flows out from the self-cleaning air outlet; The valve assembly includes: a first cleaning valve, the first cleaning valve being disposed in the first cleaning pipeline for controlling the on-off of the air path of the self-cleaning air inlet; a second cleaning valve, the second cleaning valve being disposed in the second cleaning pipeline for controlling the on-off of the air path between the second cleaning pipeline and the first drying filter; a first recovery valve, the first recovery valve being disposed at the liquid inlet of the liquid storage tank for controlling the on-off of the liquid path of the liquid storage tank.

5. The refrigerant recovery device according to claim 4, characterized in that, The recovery inlet serves as the self-cleaning air outlet; or, The self-cleaning pipeline further includes a third cleaning pipeline, which is connected to the second air port of the first drying filter. The self-cleaning air outlet is arranged at the end of the third cleaning pipeline away from the first drying filter. The external air flow entering the first cleaning pipeline blows the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the first drying filter, and the third cleaning pipeline in sequence, and then flows out from the self-cleaning air outlet; The valve assembly further includes a third cleaning valve, which is arranged in the third cleaning pipeline to control the on-off of the air path of the self-cleaning air outlet; A second recovery valve, which is arranged in the connecting pipeline between the second air port of the first drying filter and the recovery inlet to control the on-off of the air path of the recovery inlet.

6. The refrigerant recovery device according to claim 5, characterized in that, The self-cleaning pipeline further includes a fourth cleaning pipeline, which is connected to the first cleaning pipeline and the third cleaning pipeline; The valve assembly includes: A pipeline reversing valve, which is arranged at the connection of the first cleaning pipeline, the recovery pipeline, and the fourth cleaning pipeline to switch the on-off of the air path between the first cleaning pipeline and the fourth cleaning pipeline, between the first cleaning pipeline and the recovery pipeline, and between the fourth cleaning pipeline and the recovery pipeline through the pipeline reversing valve; A fourth cleaning valve, which is arranged in the fourth cleaning pipeline to control the on-off of the air path of the fourth cleaning pipeline; A fifth cleaning valve, which is arranged between the first air port of the first drying filter and the second cleaning pipeline to control the on-off of the air path at the first air port of the first drying filter.

7. The refrigerant recovery device according to claim 4, characterized in that The self-cleaning assembly further includes a dirt collector. The air inlet of the dirt collector is connected to the second air port of the first drying filter, and the air outlet of the dirt collector serves as the self-cleaning air outlet.

8. The refrigerant recovery device according to claim 4, characterized in that, The self-cleaning assembly further includes a second drying filter, which is arranged in the first cleaning pipeline to process the external air flow entering from the self-cleaning air inlet.

9. The refrigerant recovery device according to claim 1, characterized in that, The refrigerant recovery device further includes at least one pressure detection element, and at least one pressure detection element is distributed in the recovery pipeline to detect the pressure distribution data in the recovery pipeline.

10. A control method for a refrigerant recovery device, characterized in that, The refrigerant recovery device includes the refrigerant recovery device according to any one of claims 1-9. The control method includes: Obtaining the pressure distribution data in the recovery pipeline; When it is determined that the self-cleaning condition is met based on the pressure distribution data, controlling the refrigerant recovery device to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the valve assembly to act to adjust the connection between the self-cleaning pipeline and the recovery pipeline to introduce external air flow to blow the recovery pipeline for pipeline self-cleaning, and controlling the vibration assembly to vibrate to peel off the oil stains attached to the inner wall of the recovery pipeline.

11. The control method of the refrigerant recovery device according to claim 10, characterized in that, The pressure distribution data includes a first pressure value detected at the second air port of the first drying filter and a second pressure value detected between the compressor and the first air port of the first drying filter; Determining that the self-cleaning condition is met based on the pressure distribution data includes: If the pressure difference between the first pressure value and the second pressure value is greater than or equal to a first pressure threshold, determining that the self-cleaning condition is met; and / or, The pressure distribution data further includes a third pressure value detected between the compressor and the oil separator, and a fourth pressure value detected between the heat exchanger and the liquid storage tank; Determining that the self-cleaning condition is met based on the pressure distribution data includes: If the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to a second pressure threshold, determining that the self-cleaning condition is met.

12. The control method of the refrigerant recovery device according to claim 11, wherein, When the pressure difference between the first pressure value and the second pressure value is greater than or equal to the first pressure threshold and the self-cleaning condition is determined, or when the pressure difference between the first pressure value and the second pressure value is greater than or equal to the first pressure threshold, and the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to the second pressure threshold and the self-cleaning condition is determined, performing the self-cleaning mode includes: Adjusting the opening and closing state of the valve assembly so that the external air flow entering from the first cleaning pipeline sequentially flows through the second dry filter, the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the fourth cleaning pipeline, and the self-cleaning air outlet; Controlling the compressor and the vibration assembly to work; When it is detected that the pipeline replacement condition is reached, adjusting the opening and closing state of the valve assembly so that the external air flow entering from the first cleaning pipeline sequentially flows through the second dry filter, the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the first dry filter, and the self-cleaning air outlet; When it is detected that the cleaning stop condition is reached, stopping the compressor and the vibration assembly from working.

13. The control method of the refrigerant recovery device according to claim 11, characterized in that, When the pressure difference between the first pressure value and the second pressure value is less than the first pressure threshold, and the pressure difference between the third pressure value and the fourth pressure value is greater than or equal to the second pressure threshold and the self-cleaning condition is determined, performing the self-cleaning mode includes: Adjusting the opening and closing state of the valve assembly so that the external air flow entering from the first cleaning pipeline sequentially flows through the second dry filter, the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the fourth cleaning pipeline, and the self-cleaning air outlet; Controlling the compressor and the vibration assembly to work; When it is detected that the cleaning stop condition is reached, stopping the compressor and the vibration assembly from working.

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