Refrigerant recovery equipment and control method thereof

Abstract

The present invention discloses a refrigerant recovery device and a control method thereof, and relates to the field of refrigerant recovery technology. The present invention includes a recovery unit, a vibration component, a self-cleaning component and a valve component. The recovery unit includes a recovery pipeline. The vibration component 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 component includes a self-cleaning pipeline, which is connected to the recovery pipeline and is used to self-clean the pipeline by introducing external airflow to blow the recovery pipeline. The valve component is arranged in the recovery pipeline and the self-cleaning pipeline for pipeline switching when the operating mode of the refrigerant recovery equipment is changed. In this way, the oil stains attached to the refrigeration machine recovery equipment can be cleaned without stopping the machine for disassembly and cleaning, thereby improving the cleaning convenience of the refrigeration machine recovery equipment and reducing the flow resistance in the recovery pipeline, thereby greatly improving the recovery efficiency of the refrigerant recovery equipment.

Description

Technical Field

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

[0002] As public awareness of environmental protection grows, the demand for refrigerant recycling is also increasing. Refrigerant recycling typically requires a compressor and other components to form a refrigerant recovery system for refrigerant treatment, such as removing impurities and moisture.

[0003] However, due to the miscibility of refrigerants and compressor lubricants, recovered refrigerants often carry a high level of oil contamination, such as compressor lubricants and other impurities. Consequently, after repeated use, the refrigerant recovery system's pipes are prone to oil contamination, requiring frequent downtime and cleaning, significantly reducing the system's recovery efficiency. Summary of the Invention

[0004] Aiming at the problem that the inner wall of the recovery system pipe is easily adhered to oil and dirt, which requires frequent shutdown for cleaning, the present invention is proposed to provide a refrigerant recovery device and a control method thereof that overcome the above problem or at least partially solve the above problem.

[0005] Based on the first aspect of the present invention, a refrigerant recovery device is provided, which includes: a recovery unit, the recovery unit including a recovery pipeline; a vibration component, the vibration component is arranged on the outer surface of the recovery pipeline, and is used to peel off oil stains attached to the inner wall of the recovery pipeline; a self-cleaning component, the self-cleaning component includes a self-cleaning pipeline, the self-cleaning pipeline is connected to the recovery pipeline, and is used to self-clean the pipeline by introducing external airflow to blow the recovery pipeline; a valve assembly, the valve assembly is arranged in the recovery pipeline and the self-cleaning pipeline, and is used for pipeline switching when the operating mode of the refrigerant recovery device is changed.

[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, and each two adjacent components of the first drying filter, compressor, oil separator, heat exchanger and liquid storage tank are connected through a connecting pipe, and the first drying filter is connected to the recovery inlet of the recovery unit so that the refrigerant flowing into the recovery inlet passes through the first drying filter, compressor, oil separator and heat exchanger in sequence and enters the liquid storage tank for storage; the vibration component includes at least one vibrator, which 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 is that the connecting pipe is made of soft material.

[0008] An optional invention content, the self-cleaning pipeline includes: a first cleaning pipeline, the first cleaning pipeline includes a self-cleaning air inlet, the first cleaning pipeline is connected to the air inlet of the compressor; a second cleaning pipeline, the second cleaning pipeline is connected to the liquid inlet of the liquid storage tank and the first air port of the first drying filter, wherein the second air port of the first drying filter is connected to 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 air circuit of the self-cleaning air inlet; the second cleaning valve, the second cleaning valve is arranged in the second cleaning pipeline to control the air circuit between the second cleaning pipeline and the first drying filter; the first recovery valve, the first recovery valve is arranged at the liquid inlet of the liquid storage tank to control the liquid circuit of the liquid storage tank.

[0009] An optional invention content, the recovery inlet serves as the self-cleaning air outlet; or, the self-cleaning pipeline also includes a third cleaning pipeline, and 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, and the external air flow entering the first cleaning pipeline sequentially purges the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, the first drying filter and the third cleaning pipeline, and then flows out from the self-cleaning air outlet; the valve assembly also includes a third cleaning valve, and the third cleaning valve is arranged in the third cleaning pipeline to control the air circuit of the self-cleaning air outlet; the second recovery valve, the second recovery valve is arranged in the connecting pipe between the second air port of the first drying filter and the recovery inlet, to control the air circuit of the recovery inlet.

[0010] An optional invention content, the self-cleaning pipeline also includes a fourth cleaning pipeline, the fourth cleaning pipeline connects the first cleaning pipeline and the third cleaning pipeline; the valve assembly includes: a pipeline reversing valve, the pipeline reversing valve is arranged at the connection point of the first cleaning pipeline, the recovery pipeline and the fourth cleaning pipeline, so as to switch the air circuit between the first cleaning pipeline and the fourth cleaning pipeline, the first cleaning pipeline and the recovery pipeline, and the fourth cleaning pipeline and the recovery pipeline through the pipeline reversing valve; a fourth cleaning valve, the fourth cleaning valve is arranged in the fourth cleaning pipeline to control the air circuit of the fourth cleaning pipeline; the fifth cleaning valve, the fifth cleaning valve is arranged between the first air port of the first drying filter and the second cleaning pipeline to control the air circuit at the first air port of the first drying filter.

[0011] An optional invention content is that the self-cleaning component 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 is that the self-cleaning component 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.

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

[0014] Based on the second aspect of the present invention, a control method is also provided, and the refrigerant recovery equipment includes the refrigerant recovery equipment as described in any one of the above-mentioned invention contents, and the control method includes: obtaining pressure distribution data in the recovery pipeline; when it is determined that the self-cleaning conditions are met based on the pressure distribution data, controlling the refrigerant recovery equipment to execute a self-cleaning mode, and executing the self-cleaning mode includes: controlling the action of the valve component to adjust the self-cleaning pipeline to form a connection with the recovery pipeline, so as to introduce external airflow to blow the recovery pipeline for pipeline self-cleaning, and controlling the vibration of the vibration component to peel off 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; the self-cleaning condition is determined to be satisfied based on the pressure distribution data, including: 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 also 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; the self-cleaning condition is determined to be satisfied based on the pressure distribution data, including: 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 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 a first pressure threshold, it is determined that the self-cleaning condition is met, 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, it is determined that the self-cleaning condition is met, the execution of the self-cleaning mode includes: adjusting the switching state of the valve assembly so that the external airflow entering from the first cleaning pipeline 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 in sequence; controlling the operation of the compressor and the vibration assembly; when it is detected that the pipeline replacement condition is met, adjusting the switching state of the valve assembly so that the external airflow entering from the first cleaning pipeline 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 in sequence; when it is detected that the cleaning stop condition is met, stopping the operation of the compressor and the vibration assembly.

[0017] An optional invention content, when the pressure difference between the first pressure value and the second pressure value is less than a 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 is determined that the self-cleaning condition is met, and the execution of the self-cleaning mode includes: adjusting the switching state of the valve assembly so that the external airflow entering from the first cleaning pipeline 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 in sequence; controlling the operation of the compressor and the vibration assembly; and stopping the operation of the compressor and the vibration assembly when it is detected that the cleaning stop condition is met.

[0018] Compared with the prior art, the present invention includes a recovery unit, a vibration component, a self-cleaning component and a valve component. The recovery unit includes a recovery pipeline. The vibration component 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 component includes a self-cleaning pipeline, which is connected to the recovery pipeline and is used to self-clean the pipeline by introducing external airflow to blow the recovery pipeline. The valve component is arranged in the recovery pipeline and the self-cleaning pipeline for pipeline switching when the operating mode of the refrigerant recovery equipment is changed. In this way, the oil stains attached to the refrigeration machine recovery equipment can be cleaned without stopping the machine for disassembly and cleaning, which improves the cleaning convenience of the refrigeration machine recovery equipment and reduces the flow resistance in the recovery pipeline, thereby greatly improving the recovery efficiency of the refrigerant recovery equipment.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be construed as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components.

[0021] In the attached figure:

[0022] Figure 1 This is a schematic diagram of the flow direction of refrigerant when a refrigerant recovery device according to an embodiment of the present invention operates in a self-cleaning mode;

[0023] Figure 2This is a schematic diagram of an airflow cleaning path when a refrigerant recovery device according to an embodiment of the present invention operates in a recovery mode;

[0024] Figure 3 This is a schematic diagram of an airflow cleaning path when another refrigerant recovery device provided by an embodiment of the present invention operates in a self-cleaning mode;

[0025] Figure 4 This is a schematic diagram of the flow direction of refrigerant when another refrigerant recovery device provided by an embodiment of the present invention operates in a recovery mode;

[0026] Figure 5 This is a schematic diagram of a first airflow cleaning path when another refrigerant recovery device provided by an embodiment of the present invention operates in a self-cleaning mode;

[0027] Figure 6 This is a schematic diagram of a second airflow cleaning path when another refrigerant recovery device provided by an embodiment of the present invention operates in a self-cleaning mode;

[0028] Figure 7 This is a schematic diagram of the flow direction of refrigerant when another refrigerant recovery device provided by an embodiment of the present invention operates in a recovery mode;

[0029] Figure 8 This is a block diagram of the electrical connection structure of a refrigerant recovery device provided by an embodiment of the present invention;

[0030] Figure 9 This is a schematic flow chart of the steps of a control method for a refrigerant recovery device provided by an embodiment of the present invention;

[0031] Figure 10 This is a schematic flow chart of steps of another control method for refrigerant recovery equipment provided by an embodiment of the present invention;

[0032] Figure 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. Equipment to be recovered. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying 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. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0034] As public awareness of environmental protection grows, the demand for refrigerant recycling is also increasing. Refrigerant recycling typically requires a compressor and other components to form a refrigerant recovery system for refrigerant treatment, such as removing impurities and moisture.

[0035] However, due to the miscibility of refrigerants and compressor lubricants, recovered refrigerants often carry a high level of oil contamination, such as compressor lubricants and other impurities. Consequently, after repeated use, the refrigerant recovery system's pipes are prone to oil contamination, requiring frequent downtime and cleaning, significantly reducing the system's recovery efficiency.

[0036] Based on the above technical problems, an embodiment of the present invention is proposed. The embodiment 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 attached to the inner wall of the recovery pipeline. The self-cleaning component 3 includes a self-cleaning pipeline, which is connected to the recovery pipeline and is used to self-clean the pipeline by introducing external airflow to blow the recovery pipeline. The valve component 4 is arranged in the recovery pipeline and the self-cleaning pipeline for pipeline switching when the operating mode of the refrigerant recovery equipment is changed. In this way, the oil stains attached to the refrigeration machine recovery equipment can be cleaned without stopping the machine for disassembly and cleaning, which improves the cleaning convenience of the refrigeration machine recovery equipment and reduces the flow resistance in the recovery pipeline, thereby greatly improving the recovery efficiency of the refrigerant recovery equipment.

[0037] Reference Figure 1-7 An embodiment of the present invention provides 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 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 component 3 includes a self-cleaning pipeline, which is connected to the recovery pipeline and is used to self-clean the pipeline by introducing external airflow to blow the recovery pipeline. The valve component 4 is arranged in the recovery pipeline and the self-cleaning pipeline for pipeline switching when the operating mode of the refrigerant recovery device is changed.

[0038] In this embodiment of the present invention, the recovery unit 1 can be understood as a collection of components including the devices and pipelines required for refrigerant recovery. It is used to connect to the equipment to be recovered 7 to recover the refrigerant. The equipment to be recovered 7 can be understood as any electrical device that consumes refrigerant. For example, the equipment to be recovered 7 may include, but is not limited to, refrigerators, freezers, air conditioners, refrigeration units, cold drink dispensers, ice makers, and other related equipment with refrigeration requirements.

[0039] When in operation, the vibration assembly 2 can drive the connected components to vibrate synchronously. For example, the vibration assembly 2 is disposed on the outer surface of the recovery pipe, so that the vibration energy generated by the vibration assembly 2 can remove oil stains adhered to the inner wall of the recovery pipe. For example, by vibrating at a certain frequency, the oil film and impurities formed by the lubricating oil adhered to the inner wall of the recovery pipe can be removed.

[0040] The self-cleaning component 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 uniformly collected and processed by blowing external airflow, thereby achieving self-cleaning of the recovery pipeline.

[0041] When self-cleaning of the pipeline is required, the valve assembly 4 is used to adjust the pipeline connection state between the recovery pipeline and the self-cleaning pipeline, and the vibration assembly 2 and the self-cleaning assembly 3 cooperate with each other to peel off the oil film and impurities attached to the inner wall of the recovery pipeline and blow them out of the recovery pipeline. Therefore, through the cooperation between the vibration assembly 2, the self-cleaning assembly 3 and the valve assembly 4, the oil stains attached to the refrigeration machine recovery equipment can be cleaned without stopping the machine for disassembly and cleaning. This improves the cleaning convenience of the refrigeration machine recovery equipment, reduces the flow resistance in the recovery pipeline, and greatly improves the recovery efficiency of the refrigerant recovery equipment.

[0042] In an optional embodiment of the invention, referring to Figure 1-Figure 7As shown, the recovery unit 1 includes a first filter drier 11, a compressor 12, an oil separator 13, a heat exchanger 14, and a liquid storage tank 15. Each adjacent component of the first filter drier 11, compressor 12, oil separator 13, heat exchanger 14, and liquid storage tank 15 is connected via a connecting pipe 16. The first filter drier 11 is connected to the recovery inlet 101 of the recovery unit 1, so that the refrigerant flowing into the recovery inlet 101 passes through the first filter drier 11, compressor 12, oil separator 13, and heat exchanger 14 in sequence and enters the liquid storage tank 15 for storage. The vibration assembly 2 includes at least one vibrator 21, which is installed on the outer surface of the recovery pipeline between the first filter drier 11 and the recovery inlet 101. Alternatively, the vibrator 21 may be installed on the outer surface of the first filter drier 11. Alternatively, the vibrator 21 may be 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 .

[0043] In an embodiment of the present invention, the recovery unit 1 may include 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 moisture in the refrigerant, and on the other hand, it can also filter impurities in the refrigerant. For example, impurities may include metal debris, oil stains, or dust. The compressor 12 is used to establish a pressure difference in the recovery pipeline, driving the refrigerant in the device to be recovered 7 to flow into the recovery pipeline. 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 an oil-free compressor 12 or other type.

[0044] The oil separator 13 is used to separate lubricating oil from the refrigerant to prevent it from settling in the recovery line. The heat exchanger 14 can be used to cool the high-temperature, high-pressure gaseous refrigerant flowing out of the oil separator 13, thereby converting it into liquid refrigerant, which can then flow into the liquid storage tank 15 for storage. In one or more embodiments, the heat exchanger 14 can include an air-cooled heat exchanger 14 and / or a water-cooled heat exchanger 14.

[0045] The first filter dryer 11 and the recovery inlet 101 of the recovery unit 1, the first filter dryer 11 and the compressor 12, the compressor 12 and the oil separator 13, the oil separator 13 and the heat exchanger 14, and the heat exchanger 14 and the liquid storage tank 15 can be connected by connecting pipes 16. In other words, the recovery pipeline of the recovery unit 1 can be understood as a combination of pipes inside multiple connecting pipes 16 and device pipelines in different devices used to supply refrigerant recovery processing. Therefore, when the refrigerant recovery equipment is operating in the recovery mode, the refrigerant flows from the device to be recovered 7 into the recovery inlet 101 and flows through the first filter dryer 11, the compressor 12, the oil separator 13, the heat exchanger 14, and the liquid storage tank 15 in sequence.

[0046] The vibration component 2 may include at least one vibrator 21, wherein the vibrator 21 may include: an ultrasonic generator and / or a piezoelectric ceramic transducer. For example, when the vibrator 21 is an ultrasonic generator, the operating frequency of the vibrator 21 may be between 20 kHz and 40 kHz (inclusive), and may adopt an intermittent pulse mode (duty cycle of 50 ), to periodically excite the ultrasonic cavitation effect, thereby improving the oil removal effect of the vibrator 21.

[0047] In one or more embodiments, the vibrator 21 can be installed on the outer surface of the recovery pipeline between the first filter dryer 11 and the recovery inlet 101. The recovery inlet 101 is used to communicate with the device to be recovered 7. In this way, the oil film and impurities attached to the inner wall of the connecting pipeline 16 between the first filter dryer 11 and the recovery inlet 101 can be vibrated away.

[0048] In one or more embodiments, the vibrator 21 may be mounted on the outer surface of the first filter drier 11. The interior of the first filter drier 11 serves as a device pipeline of the recovery pipeline. The vibrator 21 can be in surface contact with the outer surface of the first filter drier 11 to vibrate and remove the oil film and impurities attached to the interior of the first filter drier 11.

[0049] In one or more embodiments, the vibrator 21 can be installed on the outer surface of the heat exchanger 14, and the interior of the heat exchanger 14 serves as a device pipeline of the recovery pipeline. The vibrator 21 can be in surface contact with the outer surface of the heat exchanger 14 to vibrate and peel off the oil film and impurities attached to the interior of the heat exchanger 14.

[0050] In one or more embodiments, the vibrator 21 can be installed on the outer surface of the recovery pipe between the heat exchanger 14 and the liquid storage tank 15. In this way, the oil film and impurities attached to the inner wall of the connecting pipe 16 between the heat exchanger 14 and the liquid storage tank 15 can be vibrated and removed.

[0051] In summary, when the vibration assembly 2 includes one vibrator 21, the vibrator 21 can be installed in any of the aforementioned positions. When the vibration assembly 2 includes at least two vibrators 21, at least two of the four aforementioned installation areas can be selected for installation according to actual design requirements. In other words, at least two vibrators 21 are spaced apart and distributed along the recovery pipeline. No further restrictions are imposed here.

[0052] In an optional embodiment of the invention, the connecting pipe 16 is made of soft material.

[0053] In the embodiment of the present invention, the connecting pipe 16 is made of a soft material, which can prevent the structural rigidity of the connecting pipe 16 from affecting the operating performance of the compressor 12 when the vibrator 21 vibrates. This improves the operating stability of the refrigerator recovery device and extends the service life of the compressor 12.

[0054] In an optional 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 connected to the air inlet of the compressor 12. The second cleaning pipeline 32 connects the liquid inlet of the liquid storage tank 15 and the first air port of the first drying filter 11, wherein the second air port of the first drying filter 11 is connected to 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 before flowing out of the self-cleaning air outlet 301.

[0055] 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 line 31 to control the air flow of the self-cleaning air inlet 311. The second cleaning valve 42 is disposed in the second cleaning line 32 to control the air flow between the second cleaning line 32 and the first filter drier 11. The first recovery valve 43 is disposed at the liquid inlet of the liquid storage tank 15 to control the liquid flow of the liquid storage tank 15.

[0056] 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 a self-cleaning air inlet 311 of the self-cleaning pipeline for introducing external airflow. The other end of the first cleaning pipeline 31 is connected to the air inlet of the compressor 12. For example, the other end of the first cleaning pipeline 31 can form an air connection with the connecting pipe 16 located between the compressor 12 and the first drying filter 11. Therefore, when the refrigerant recovery equipment is operating 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 form a connection. This allows the external airflow to flow into the compressor 12 for compression. Then it passes through the oil separator 13 and the heat exchanger 14 in sequence.

[0057] The second cleaning pipeline 32 connects the liquid inlet of the liquid storage tank 15 with the first air port of the first drying filter 11. That is, when the refrigerant recovery equipment is in 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 drying filter 11. After passing through the first drying 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 oil stains in the device pipelines of the compressor 12, oil separator 13, heat exchanger 14 and first drying filter 11, as well as the pipelines between different components, can be stripped and cleaned in sequence.

[0058] 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. The first cleaning valve 41 is disposed in the first cleaning pipeline 31 to control the air passage of the self-cleaning air inlet 311. For example, when the refrigerant recovery device is operating in a recovery mode, the first cleaning valve 41 is controlled to close the self-cleaning air inlet 311. When the refrigerant recovery device is operating in a self-cleaning mode, the first cleaning valve 41 is controlled to open the self-cleaning air inlet 311.

[0059] The second cleaning valve 42 is provided 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 is operating in the recovery mode, the second cleaning valve 42 is controlled to be closed, and the first recovery valve 43 is controlled to be opened. In this way, the refrigerant flowing out of the heat exchanger 14 can flow to the liquid storage tank 15 for storage. When the refrigerant recovery device is operating in the self-cleaning mode, the first recovery valve 43 can be controlled to be closed, and the second cleaning valve 42 can be controlled to be opened. The oil purged from the heat exchanger 14 will not enter the liquid storage tank 15, but will flow through the second cleaning pipeline 32 and into the first drying filter 11.

[0060] In one or more embodiments, reference Figure 1 As shown, the recovery inlet 101 can directly serve as the self-cleaning air outlet 301. Thus, when the refrigerant recovery equipment is in self-cleaning mode, the equipment to be recovered 7 connected to the recovery inlet 101 can be replaced with a dirt collecting device. Thus, when the vibration component 2 is working, the first cleaning valve 41, the second cleaning valve 42 and the first recovery valve 43 can be controlled to operate, so that the external airflow sequentially sweeps the compressor 12, the oil separator 13, the heat exchanger 14, the first drying filter 11 and the recovery inlet 101 to complete the removal of oil stains in the recovery unit 1. Without the need to stop the machine to disassemble and clean the various components and connecting pipes 16, the attached oil stains in the refrigeration machine recovery equipment can be cleaned. The cleaning convenience of the refrigeration machine recovery equipment is improved, the flow resistance in the recovery pipeline is reduced, and the recovery efficiency of the refrigerant recovery equipment is greatly improved.

[0061] In one or more embodiments, reference Figure 3 and Figure 4As shown, the self-cleaning pipeline may further include a third cleaning pipeline 33, which is connected to the second air port of the first filter drier 11. In other words, the self-cleaning air outlet 301 may be located at the end of the third cleaning pipeline 33 away from the first filter drier 11. The valve assembly 4 may further include a third cleaning valve 44 and a second recovery valve 45. The third cleaning valve 44 is installed in the third cleaning pipeline 33 to control the air flow to the self-cleaning air outlet 301. The second recovery valve 45 is installed in the connecting pipe 16 between the first filter drier 11 and the recovery inlet 101 to control the air flow to the recovery inlet 101. Therefore, when the refrigerant recovery equipment is operating in self-cleaning mode, the second recovery valve 45 can be controlled to close the recovery inlet 101, and the third cleaning valve 44 can be controlled to open the self-cleaning inlet. This prevents oil purged from the first filter drier 11 from entering the equipment to be recovered 7 and flowing into the third cleaning pipeline 33.

[0062] 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 is connected to the second air port of the first drying filter 11. The self-cleaning air outlet 301 is provided at the end of the third cleaning pipeline 33 away from the first drying filter 11. The external airflow entering the first cleaning pipeline 31 sequentially purges 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 before flowing out of the self-cleaning air outlet 301. The valve assembly 4 further includes a third cleaning valve 44, which is provided in the third cleaning pipeline 33 to control the on-off of the air path of the self-cleaning air outlet 301.

[0063] In an optional embodiment of the invention, referring to Figure 5 、 Figure 6 as well as Figure 7As shown, the self-cleaning pipeline also includes a fourth cleaning pipeline 34, which connects 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 point between the first cleaning pipeline 31, the recovery pipeline, and the fourth cleaning pipeline 34. The pipeline reversing valve 46 switches the air flow between the first cleaning pipeline 31 and the fourth cleaning pipeline 34, the first cleaning pipeline 31 and the recovery pipeline, and the fourth cleaning pipeline 34 and the recovery pipeline. The fourth cleaning valve 47 is disposed in the fourth cleaning pipeline 34 to control the air flow of the fourth cleaning pipeline 34. The fifth cleaning valve 48 is disposed between the first air port of the first filter drier 11 and the second cleaning pipeline 32 to control the air flow at the first air port of the first filter drier 11.

[0064] In an embodiment of the present invention, the pipeline reversing valve 46 can be a four-way reversing valve or other type, and can be installed at the connection point between the first cleaning pipeline 31, the recovery pipeline, and the fourth cleaning pipeline 34. For example, the pipeline reversing valve 46 includes at least a first interface, a second interface, a third interface, and a fourth interface, wherein the first interface is connected to the first cleaning pipeline 31, the second interface is connected to the air inlet of the compressor 12, the third interface is connected to the first air port of the first drying filter 11, and the fourth interface is connected to the fourth cleaning pipeline 34. When the refrigerant recovery device is in recovery mode, the first interface of the pipeline reversing valve 46 is connected to the fourth interface, and the second interface is connected to the third interface, so that the refrigerant flowing out of the first drying filter 11 flows into the compressor 12.

[0065] When the refrigerant recovery device is in the self-cleaning mode, the first interface of the pipeline reversing valve 46 is connected to the second interface, and the third interface is connected to the fourth interface, so that the external airflow in the first cleaning pipeline 31 flows to the compressor 12.

[0066] In one or more embodiments, considering that oil may be present in the heat exchanger 14 during reverse purge of the first filter drier 11, thereby contaminating the first filter drier 11, the refrigerant recovery device can be configured to operate in self-cleaning mode by controlling the fifth cleaning valve 48 to close the air path at the first air port of the first filter drier 11 and controlling the fourth cleaning valve 47 to operate to connect the air path of the fourth cleaning line 34. As a result, the oil flowing from the heat exchanger 14 into the second cleaning line 32 flows into the fourth connecting line connected thereto, then flows through the fourth connecting line to the third cleaning line 33, and finally is discharged from the self-cleaning air outlet 301 of the third cleaning line 33.

[0067] 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 oil stains in the connecting pipe 16 between the first drying filter 11 and the recovery inlet 101 can be cleaned.

[0068] In an optional embodiment of the invention, referring to Figure 5 、 Figure 6 as well as Figure 7 As shown, the self-cleaning component 3 further includes a dirt collector 35 , the air inlet of the dirt collector 35 is communicated with the second air port of the first drying filter 11 , and the air outlet of the dirt collector 35 serves as the self-cleaning air outlet 301 .

[0069] In this embodiment of the present invention, the dirt collector 35 is a device for intercepting oil contaminants such as lubricating oil and / or particulate matter. The air inlet of the dirt collector 35 can be connected to the second air port of the first filter dryer 11. This allows the oil contaminants purged from the first filter dryer 11 to be treated and discharged outside the dirt collector. The air outlet of the dirt collector 35 directly serves as the self-cleaning air outlet 301, allowing the treated air to be discharged directly into the external environment of the refrigerant recovery equipment.

[0070] In one or more embodiments, the air inlet of the sewage collector 35 can also be connected to the fourth cleaning pipeline 34, so that the oil flowing from the heat exchanger 14 into the second cleaning pipeline 32 can flow into the sewage collector 35 through the fourth cleaning pipeline 34 to be collected in the sewage collector, and then discharged into the external environment of the refrigerant recovery equipment through the air outlet of the sewage collector 35.

[0071] In an optional embodiment of the invention, referring to Figure 5 、 Figure 6 as well as Figure 7 As shown, the self-cleaning component 3 further includes a second drying filter 36 , which is disposed in the first cleaning pipeline to process the external airflow entering from the self-cleaning air inlet 311 .

[0072] In the embodiment of the present invention, the second drying filter 36 is used to filter impurities and moisture in the external airflow, thereby avoiding the introduction of impurities and moisture that would reduce the recovery quality of the refrigerant in the recovery mode.

[0073] In an optional embodiment of the invention, referring 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 pressure distribution data in the recovery pipeline.

[0074] In an embodiment of the present invention, the pressure detection element 5 may include but is not limited to strain gauge pressure sensors, vibrating string pressure sensors, and piezoelectric pressure sensors. At least one of the pressure detection elements 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 it is necessary to run the self-cleaning mode by comparing the pipeline pressure values ​​before and after. For example, when there is a lot of oil stains attached to the inner wall of the recovery pipeline, it will affect the flow resistance of the refrigerant in the recovery pipeline and affect the pressure changes in the same pipeline area. Thus, it is possible to determine whether it is necessary to run the self-cleaning mode based on the pressure change value obtained from the actual test. In this way, the refrigerant recovery equipment can be self-cleaned in a timely manner, and the recovery efficiency of the refrigerant is improved.

[0075] 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 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 component 3 includes a self-cleaning pipeline, which is connected to the recovery pipeline and is used to self-clean the pipeline by introducing external airflow to blow the recovery pipeline. The valve component 4 is arranged in the recovery pipeline and the self-cleaning pipeline for pipeline switching when the operating mode of the refrigerant recovery device is changed. In this way, the oil stains attached to the refrigeration machine recovery device can be cleaned without stopping the machine for disassembly and cleaning, thereby improving the cleaning convenience of the refrigeration machine recovery device and reducing the flow resistance in the recovery pipeline, thereby greatly improving the recovery efficiency of the refrigerant recovery device.

[0076] In some embodiments, reference Figure 8 As shown, the refrigerant recovery device may further include a controller 6. The recovery unit 1, the vibration assembly 2, the valve assembly 4, and the pressure detection element 5 are electrically connected to the controller 6. Thus, the controller 6 can control the operation 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 achieving switching between the recovery mode and the self-cleaning mode.

[0077] Reference Figure 9 As shown, an embodiment of the present invention further provides a control method for a refrigerant recovery device, and the control method may include:

[0078] S901: Obtain pressure distribution data in the recovery pipeline.

[0079] S902. When it is determined based on the pressure distribution data that the self-cleaning conditions are met, the refrigerant recovery equipment is controlled to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the action of the valve assembly 4 to adjust the self-cleaning pipeline to be connected with the recovery pipeline, so as to introduce external airflow 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.

[0080] In an embodiment of the present invention, the pressure distribution data includes at least one pipeline pressure value detected by the pressure detection element 5. The self-cleaning condition can be understood as a pressure-related condition used to determine whether the device is operating in self-cleaning mode. In one example, the self-cleaning condition can be determined to be satisfied by determining, based on the pressure distribution data, that the pressure value corresponding to a point in the recovery pipeline meets a set threshold, or by determining, based on the pressure distribution data, that the pressure difference corresponding to two points in the recovery pipeline meets a set threshold. Thus, the refrigerant recovery device is controlled to execute the self-cleaning mode. According to the description of the operation of the refrigerant recovery device in the above embodiment, it can be seen that the controller 6 can control the operation of the valve assembly 4 to adjust the connection between the self-cleaning pipeline and the recovery pipeline. It also controls the vibration of the vibration assembly 2, so that the vibration of the vibration assembly 2 can vibrate and peel off the oil stains attached to the inner wall of the recovery pipeline, and the peeled oil stains are blown away by the external airflow, thereby achieving self-cleaning of the recovery pipeline.

[0081] In one example, the compressor 12 of the recovery unit 1 can provide the purging power of the external airflow in the recovery pipeline and the self-cleaning pipeline. Thus, the high-pressure airflow purging generated by the compressor 12 can quickly peel off the oil stains attached to the inner wall of the recovery pipeline. Therefore, the self-cleaning mode is further implemented by controlling the compressor 12 to compress the external airflow entering the self-cleaning air inlet 311. For example, the external airflow can be external air or nitrogen with a relatively high purity.

[0082] In other embodiments, those skilled in the art may also install a power source such as an air pump in the relevant pipeline to provide the blowing power of the external airflow, which is not limited here.

[0083] Reference Figure 10 As shown, an embodiment of the present invention further provides a control method for a refrigerant recovery device, which may include:

[0084] S1001. Obtain pressure distribution data in the recovery pipeline, where the pressure distribution data includes a first pressure value detected at the second air port of the first drying filter 11, a second pressure value detected between the compressor 12 and the first air port of the first drying filter 11, a third pressure value detected between the compressor 12 and the oil separator 13, and a fourth pressure value detected between the heat exchanger 14 and the liquid storage tank 15.

[0085] In an embodiment of the present invention, the pressure distribution data includes at least one 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 equipment is running in the self-cleaning mode. In one example, it can be determined based on the pressure distribution data that the pressure value corresponding to a point in the recovery pipeline meets the set threshold, or it can be determined based on the pressure distribution data that the pressure difference corresponding to two points on the recovery pipeline meets the set threshold, then it can be determined that the self-cleaning condition is met. Thus, the refrigerant recovery equipment is controlled to execute the self-cleaning mode.

[0086] In some embodiments, the refrigerant recovery device may include four pressure detection elements 5. The first pressure detection element 5 (e.g. Figure 7 The second pressure detection element 5 (such as P1) is set at the second air port of the first drying filter 11 to detect the first pressure value of the recovery pipeline. Figure 7 The third pressure detection element 5 (such as P2) is set 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. Figure 7The fourth pressure detection element 5 (such as P3) is set between the compressor 12 and the oil separator 13 to detect the third pressure value of the recovery pipeline. Figure 7 The pressure sensor (P4) is provided between the heat exchanger 14 and the liquid storage tank 15 to detect and obtain a fourth pressure value of the recovery pipeline.

[0087] S1002: Determine whether a pressure difference between the first pressure value and the second pressure value is greater than or equal to a first pressure threshold.

[0088] In an embodiment of the present invention, the first pressure threshold can be understood as a critical pressure value used to determine whether there is oil accumulation in the front-end recovery pipeline of the compressor 12 (i.e., the recovery pipeline located 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 accumulation in the front-end recovery pipeline of the compressor 12. In other words, the refrigerant recovery equipment does not need to execute the self-cleaning mode at this time. Therefore, 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 accumulation in the front-end recovery pipeline of the compressor 12. In other words, the refrigerant recovery equipment needs to execute the self-cleaning mode at this time to achieve oil cleaning of the front-end recovery pipeline of the compressor 12. Therefore, the following step S1004 is executed.

[0089] S1003: Determine whether a pressure difference between the third pressure value and the fourth pressure value is greater than or equal to a second pressure threshold.

[0090] In this embodiment of the present invention, the second pressure threshold can be understood as a critical pressure value used to determine whether oil accumulation exists in the downstream recovery line of compressor 12 (i.e., the recovery line between the air outlet of 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 oil accumulation exists in the downstream recovery line of compressor 12. In other words, the refrigerant recovery equipment needs to enter a self-cleaning mode to clear the oil in the downstream recovery line of compressor 12. Consequently, step S1004 is executed.

[0091] 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 accumulation in the rear recovery pipeline of the compressor 12, that is, the refrigerant recovery equipment does not need to execute the self-cleaning mode at this time, and thus the above step 1001 is repeated.

[0092] S1004. Determine whether the self-cleaning conditions are met, and control the refrigerant recovery equipment to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the valve assembly 4 to adjust the self-cleaning pipeline to be connected with the recovery pipeline, so as to introduce external airflow 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.

[0093] S1005 : When it is detected that the cleaning condition is met, the compressor 12 and the vibration component 2 are stopped.

[0094] In an embodiment of the present invention, upon determining that the self-cleaning conditions are met, the controller 6 controls the refrigeration recovery device to execute a self-cleaning mode. Executing the self-cleaning mode may include: controlling the valve assembly 4 to adjust the self-cleaning line to communicate with the recovery line, thereby introducing external airflow to purge the recovery line for self-cleaning; and controlling the vibration assembly 2 to vibrate to remove oil stains adhered to the inner wall of the recovery line.

[0095] Since there are differences in the specific technical solutions for meeting the self-cleaning conditions, the specific steps for executing the self-cleaning mode may also differ accordingly. For example, the technical solution corresponding to the self-cleaning conditions 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 accumulation in the front section recovery pipeline of the compressor 12, and there is oil 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 airflow entering from the first cleaning pipeline 31 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 outlet 301 in sequence. The compressor 12 and the vibration assembly 2 located in the rear section recovery pipeline are controlled to operate. In this way, the oil attached to the rear section recovery pipeline of the compressor 12 can be vibrated and purged.

[0096] Furthermore, 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 time of the compressor 12 reaches a first preset time, it is determined that the refrigerant recovery device has reached a cleaning stop condition, at which time the compressor 12 and the vibration component 2 are stopped, and the switch state of the valve component 4 can be reset to an initial state. For example, the initial state of the valve component 4 can be the switch state of each valve corresponding to when the refrigerant recovery device is operating in a recovery mode.

[0097] In other embodiments, the technical method corresponding to satisfying the self-cleaning condition is: the pressure difference between the first pressure value and the second pressure value is greater than or equal to the 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 the second pressure threshold, it can be determined that there is oil accumulation in the front-end recovery pipeline of the compressor 12, or that there is oil accumulation in both the front-end recovery pipeline and the rear-end recovery pipeline of the compressor 12. At this time, in order to prevent the oil in the rear-end recovery pipeline from entering the first drying filter 11 during the purge process and contaminating the first drying filter 11, the switch state of the valve assembly 4 can be first adjusted so that the external airflow entering from the first cleaning pipeline 31 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 in sequence. The compressor 12 and the vibration assembly 2 in the rear recovery line are controlled to work. Thus, the oil stains attached to the rear recovery line of the compressor 12 can be vibrated and purged.

[0098] 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 time of the compressor 12 reaches the second preset time (the first preset time and the second preset time can be consistent), it is determined that the refrigerant recovery equipment has met the pipeline replacement conditions. For example, the first preset time can be a value such as 3 minutes, which is not limited here. At this time, the switching state of the valve assembly 4 is adjusted so that the external airflow entering from the first cleaning pipeline 31 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 in sequence. This achieves vibration stripping and purging of the oil stains attached to the front recovery pipeline of the compressor 12.

[0099] 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 time of the compressor 12 reaches a first preset time, the refrigerant recovery device is determined to have reached a cleaning stop condition. At this time, the compressor 12 and the vibration component 2 are stopped, and the switch state of the valve component 4 can be reset to an initial state. For example, the initial state of the valve component 4 can be the switch state of each valve corresponding to when the refrigerant recovery device is operating in a recovery mode.

[0100] When the refrigerant recovery device operates in recovery mode, the refrigerant flowing out of the to-be-recovered device 7 can flow sequentially through the first filter dryer 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 a third pressure threshold, the operation of the compressor 12 is stopped. The third pressure threshold can be understood as a critical pressure value that affects the service life of the compressor 12. For example, the third pressure threshold can be a value such as 0.1 MPa. No further restrictions are imposed here.

[0101] 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 determined comprehensively based on the length and diameter of the connecting pipe 16. For example, the pressure difference can be 0.2 MPa or the like, which is not limited here.

[0102] In the embodiment of the present invention, the control logic in the embodiment of the present invention can be adapted by increasing or decreasing the number of valves in the valve assembly 4, or the positions of relevant valves in the pipeline, which is not limited here.

[0103] In summary, an embodiment of the present invention discloses a control method for a refrigerant recovery device. The control method may include first obtaining pressure distribution data in the recovery pipeline, and then controlling the refrigerant recovery device to execute a self-cleaning mode when it is determined that the self-cleaning conditions are met based on the pressure distribution data. Executing the self-cleaning mode includes: controlling the valve assembly 4 to adjust the self-cleaning pipeline to form a connection with the recovery pipeline, so as to introduce external airflow to purge 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 refrigeration machine recovery device can be cleaned without stopping the machine for disassembly and cleaning. This improves the cleaning convenience of the refrigeration machine recovery device, reduces the flow resistance in the recovery pipeline, and greatly improves the recovery efficiency of the refrigerant recovery device.

[0104] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0105] It is easy for those skilled in the art to think that any combination of the above embodiments is feasible, so any combination of the above embodiments is an implementation scheme of the present invention. However, due to space limitations, this specification will not describe them in detail here.

[0106] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0107] Similarly, it should be understood that in order to streamline the invention and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof.

[0108] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Claims

1. A refrigerant recovery device, characterized in that: The refrigerant recovery equipment includes: a recovery unit, the recovery unit comprising a recovery pipeline, a first filter drier, a compressor, an oil separator, a heat exchanger, and a liquid storage tank, wherein each two adjacent components among the first filter drier, the compressor, the oil separator, the heat exchanger, and the liquid storage tank are connected via a connecting pipe, and the first filter drier is connected to a recovery inlet of the recovery unit, so that the refrigerant flowing from the recovery inlet passes through the first filter drier, the compressor, the oil separator, and the heat exchanger in sequence and enters the liquid storage tank for storage; a vibration component, the vibration component being arranged on the outer surface of the recovery pipeline and being used for stripping off the oil stains attached to the inner wall of the recovery pipeline; A self-cleaning component, wherein the self-cleaning component includes a self-cleaning pipeline, and the self-cleaning pipeline includes: a first cleaning pipeline, comprising a self-cleaning air inlet, the first cleaning pipeline being in communication with the air inlet of the compressor; a second cleaning pipeline communicating with a liquid inlet of the liquid storage tank and a first air port of the first drying filter, and the second air port of the first drying filter communicating with a self-cleaning air outlet, so that an external airflow entering the first cleaning pipeline sequentially purges the compressor, the oil separator, the heat exchanger, the second cleaning pipeline, and the first drying filter before flowing out from the self-cleaning air outlet; a third clean pipeline connected to the second air port of the first dry filter, the self-cleaning air outlet being provided at an end of the third clean pipeline away from the first dry filter, so that the external airflow entering the first clean pipeline sequentially purges the compressor, the oil separator, the heat exchanger, the second clean pipeline, the first dry filter, and the third clean pipeline before flowing out from the self-cleaning air outlet; a fourth cleaning pipeline, connecting the first cleaning pipeline and the third cleaning pipeline; The valve assembly includes a pipeline reversing valve, which is arranged at the connection point of the first cleaning pipeline, the recovery pipeline and the fourth cleaning pipeline to switch the air circuit between the first cleaning pipeline and the fourth cleaning pipeline, the first cleaning pipeline and the recovery pipeline, and the fourth cleaning pipeline and the recovery pipeline through the pipeline reversing valve.

2. The refrigerant recovery equipment according to claim 1, characterized in that: 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 filter drier; and / or, The vibrator is mounted 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 equipment according to claim 1, characterized in that: The connecting pipe is made of soft material.

4. The refrigerant recovery equipment according to claim 1, characterized in that: The valve assembly comprises: a first cleaning valve, the first cleaning valve being arranged in the first cleaning pipeline and being used for controlling the on-off of the air path of the self-cleaning air inlet; a second cleaning valve, the second cleaning valve being arranged in the second cleaning pipeline and used for controlling the opening and closing of the air path between the second cleaning pipeline and the first drying filter; 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.

5. The refrigerant recovery equipment according to claim 1, characterized in that: The valve assembly further includes a third cleaning valve, which is arranged in the third cleaning pipeline to control the on-off of the gas path of the self-cleaning gas outlet; The second recovery valve is provided in the connecting pipe between the second air port of the first drying filter and the recovery inlet, and is used to control the on-off of the air path of the recovery inlet.

6. The refrigerant recovery equipment according to claim 1, characterized in that: The valve assembly comprises: a fourth cleaning valve, the fourth cleaning valve being arranged in the fourth cleaning pipeline and being used for controlling the on-off of the gas path of the fourth cleaning pipeline; A fifth cleaning valve is provided between the first air port of the first drying filter and the second cleaning pipeline, and is used to control the on-off of the air path at the first air port of the first drying filter.

7. The refrigerant recovery equipment according to claim 1, characterized in that: The self-cleaning component further includes a dirt collector, the air inlet of the dirt collector is communicated with 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 equipment according to claim 1, 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 equipment according to claim 1, characterized in that: The refrigerant recovery device further includes at least one pressure detection element, which is distributed in the recovery pipeline and is used to detect 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 to 9, and the control method includes: Acquiring pressure distribution data in the recovery pipeline; When it is determined based on the pressure distribution data that the self-cleaning conditions are met, the refrigerant recovery equipment is controlled to execute the self-cleaning mode. Executing the self-cleaning mode includes: controlling the action of the valve component to adjust the self-cleaning pipeline to form a connection with the recovery pipeline, so as to introduce external airflow to blow the recovery pipeline for pipeline self-cleaning, and controlling the vibration of the vibration component to peel off the oil stains attached to the inner wall of the recovery pipeline.

11. The control method of the refrigerant recovery equipment 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 filter drier and a second pressure value detected between the compressor and the first air port of the first filter drier; Determining that the self-cleaning condition is satisfied 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, it is determined that the self-cleaning condition is met; and / or, The pressure distribution data also 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 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 the second pressure threshold, it is determined that the self-cleaning condition is met.

12. The control method for refrigerant recovery equipment according to claim 11, characterized in that: When the pressure difference between the first pressure value and the second pressure value is greater than or equal to a first pressure threshold, and it is determined that a 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 a second pressure threshold, and it is determined that a self-cleaning condition is satisfied, executing the self-cleaning mode includes: Adjusting the on / off state of the valve assembly so that the external airflow entering from the first clean pipeline flows sequentially through the second filter drier, the compressor, the oil separator, the heat exchanger, the second clean pipeline, the fourth clean pipeline, and the self-cleaning air outlet; Controlling the operation of the compressor and the vibration assembly; When it is detected that the pipeline replacement condition is met, adjusting the switch state of the valve assembly so that the external airflow entering from the first clean pipeline flows through the second dry filter, the compressor, the oil separator, the heat exchanger, the second clean pipeline, the first dry filter and the self-cleaning air outlet in sequence; When it is detected that the cleaning stop condition is reached, the compressor and the vibration component are stopped.

13. The control method of the refrigerant recovery equipment according to claim 11, characterized in that: When a pressure difference between the first pressure value and the second pressure value is less than a first pressure threshold, and a pressure difference between the third pressure value and the fourth pressure value is greater than or equal to a second pressure threshold, and it is determined that a self-cleaning condition is met, executing the self-cleaning mode includes: Adjusting the on / off state of the valve assembly so that the external airflow entering from the first clean pipeline flows sequentially through the second filter drier, the compressor, the oil separator, the heat exchanger, the second clean pipeline, the fourth clean pipeline, and the self-cleaning air outlet; Controlling the operation of the compressor and the vibration assembly; When it is detected that the cleaning stop condition is reached, the compressor and the vibration component are stopped.

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