Refrigerant recycling, purifying and filling device

Abstract

The invention belongs to the technical field of refrigerant recycling, and particularly relates to a refrigerant recycling, purifying and filling device which comprises a first pumping and filling mechanism used for recycling and filling gaseous refrigerant, one end of the first pumping and filling mechanism is communicated with a storage container, the other end of the first pumping and filling mechanism is connected with a first purifying mechanism, and the first purifying mechanism is communicated with a refrigerating system through a first pipeline; the system further comprises a second pumping and injecting mechanism used for recycling and injecting the liquid refrigerant, one end of the second pumping and injecting mechanism communicates with the storage container, the other end of the second pumping and injecting mechanism is connected with a second purifying mechanism, and the second purifying mechanism communicates with the refrigerating system through a liquid pumping and injecting pipe. And the purified and filtered lubricating oil can be reutilized.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigerant recovery, and specifically relates to a device for refrigerant recovery, purification, and charging. Background Art

[0002] With the rapid development of the refrigeration equipment industry, the damage of refrigerants such as Freon emitted by it to the environment has gradually intensified, and it has become one of the main causes of the ozone hole. In order to ensure the normal operation of large refrigeration systems, a series of tests need to be carried out on large refrigeration systems at regular intervals, including airtightness tests of the refrigeration system, etc., and it is necessary to remove impurities such as oil slag, welding slag, and moisture that may be mixed in the extracted refrigerant and affect the working performance of the equipment. Currently, the large refrigeration system recovery device only has the function of extracting refrigerant and does not have the function of purification.

[0003] To solve the above problems, we propose a device for refrigerant recovery, purification, and charging, which is improved for the deficiencies of the prior art. Summary of the Invention

[0004] In view of the various deficiencies of the prior art, the inventor has researched and designed a device for refrigerant recovery, purification, and charging through long-term practice. To solve the above technical problems, the present invention provides the following technical solutions:

[0005] A device for refrigerant recovery, purification, and charging, comprising:

[0006] A storage container for storing refrigerant;

[0007] A first pumping and injection mechanism for recovering and injecting gaseous refrigerant, one end of the first pumping and injection mechanism is connected to the storage container, and the other end is connected to a first purification mechanism, and the first purification mechanism is connected to the refrigeration system through a first pipeline;

[0008] A second pumping and injection mechanism for recovering and injecting liquid refrigerant, one end of the second pumping and injection mechanism is connected to the storage container, and the other end is connected to a second purification mechanism, and the second purification mechanism is connected to the refrigeration system through a liquid pumping and injection pipe;

[0009] The first purification mechanism includes a base provided with a constant-pressure container. The constant-pressure container is communicated with a first pipeline through an intake pipe. One side of the constant-pressure container is provided with a purification container. Both the upper and lower ends of the purification container are communicated with the constant-pressure container through pipelines. Solenoid valves are arranged on the pipelines. Filter structures are symmetrically arranged up and down in the purification container. A hollow piston is movably arranged between the two filter structures. A sealing ring is arranged between the outer side wall of the hollow piston and the inner side wall of the purification container. Unidirectional intake structures are arranged at both the upper and lower ends of the hollow piston. An intake nozzle is arranged inside the hollow piston. The base is provided with an equipment cavity. A reciprocating driving structure is arranged in the equipment cavity. The movable end of the reciprocating driving structure is connected with a movable pipe. The top end of the movable pipe penetrates upward into the purification container in sequence and is connected with the intake nozzle. A connecting pipe is inserted through one side of the equipment cavity. One end of the connecting pipe is communicated with the lower section of the movable pipe through a telescopic pipe, and the other end is connected with a first pumping mechanism. A gaseous injection bypass pipe is connected to the connecting pipe. The other end of the gaseous injection bypass pipe is connected with the first pipeline. Solenoid valves are arranged on the intake pipe, the connecting pipe and the gaseous injection bypass pipe.

[0010] Preferably, an arched top is arranged at the top end of the hollow piston. The filter structure includes a filter plate movably installed in the purification container. Sealing rings are sleeved on the outer periphery of the filter plate. Filter cotton is embedded in the filter plate. A spring is arranged between the end of the filter plate away from the hollow piston and the corresponding end of the purification container. A fixing ring for clamping the spring is arranged on the purification container. The unidirectional intake structure includes an intake port and a one-way valve arranged on the intake port.

[0011] Preferably, the first pumping mechanism includes a second pipeline with an electromagnetic three-way valve V18 arranged at one end. The second pipeline is communicated with the connecting pipe through the electromagnetic three-way valve V18. The other end of the second pipeline is communicated with the first port of a four-way ball valve through a third pipeline. The second port of the four-way ball valve is connected with a first oil separator through a fourth pipeline. The first oil separator is connected with a first compressor set through a fifth pipeline. The first compressor set is connected with a first condenser through a sixth pipeline. A second oil separator is arranged at the outlet end of the first condenser. The second oil separator is connected with a second compressor set through a seventh pipeline. The second compressor set is docked with the third port of the four-way ball valve through an eighth pipeline. The fourth port of the four-way ball valve is connected with a second condenser through a ninth pipeline. The second condenser is connected with an electromagnetic three-way valve V19 through a tenth pipeline. One valve port of the electromagnetic three-way valve V19 is communicated with a storage container through an eleventh pipeline, and the other valve port is connected with the third pipeline. A branch pipe communicated with the electromagnetic three-way valve V18 is arranged on the tenth pipeline.

[0012] Preferably, the first compressor unit includes a first-stage compressor and a second-stage compressor. The inlet of the first-stage compressor is connected to the fifth pipeline, and the outlet of the first-stage compressor is connected to the sixth pipeline. The inlet of the second-stage compressor is connected to the fifth pipeline through a second-stage bypass inlet pipe, and the outlet of the second-stage compressor is connected to the sixth pipeline through a second-stage bypass outlet pipe. The second compressor unit includes a third-stage compressor. The inlet of the third-stage compressor is connected to the seventh pipeline, and the outlet of the third-stage compressor is connected to the eighth pipeline. Both the first compressor unit and the second compressor unit are located in a temperature control box. A temperature controller is provided on the temperature control box. One end of the temperature control box is connected to a check valve V17.

[0013] Preferably, a solenoid valve V14 is provided on the first pipeline, a solenoid valve V1 is provided on the third pipeline. A pressure gauge and a suction pressure regulating valve V4 are sequentially provided on the fourth pipeline. A first branch pipe is connected between the fourth pipeline and the suction pressure regulating valve V4 and the pressure gauge. The other end of the first branch pipe is connected to a second oil separator. A solenoid valve V16 is provided on the first branch pipe. A first bypass pipe, a pressure gauge, a pressure controller and a pressure reducing valve V7 are sequentially provided on the fifth pipeline. The first bypass pipe is connected to the first branch pipe located between the fourth pipeline and the solenoid valve V16. A solenoid valve V8 is provided on the first bypass pipe. A second branch pipe is connected to the eighth pipeline. A second-stage pressure controller, a pressure gauge and a pressure reducing valve V5 are sequentially provided on the second branch pipe. A third branch pipe is connected to the sixth pipeline. A first-stage pressure controller, a pressure gauge and a pressure reducing valve V15 are provided on the third branch pipe. A liquid sight glass and an oil and liquid drain valve V6 are provided on the first oil separator. A solenoid valve V2 is provided on the tenth pipeline.

[0014] Preferably, the storage container includes at least two storage tanks. The upper part of each storage tank is connected to the eleventh pipeline through a twelfth pipeline. The second pumping mechanism is provided at the lower part of each storage tank. The second pumping mechanism includes a thirteenth pipeline. The thirteenth pipeline is connected to the second purification mechanism through a fourteenth pipeline.

[0015] Preferably, the second pumping and injection mechanism further includes a scheduling cabinet, in which an electromagnetic three-way valve V20 and an electromagnetic three-way valve V21 are arranged. The eleventh pipeline is connected to two twelfth pipelines through the electromagnetic three-way valve V20, and the fourteenth pipeline is connected to two thirteenth pipelines through the electromagnetic three-way valve V21. A scheduling vacuum pump is also arranged in the scheduling cabinet. The scheduling vacuum pump is connected to the twelfth pipeline and the thirteenth pipeline respectively through a scheduling pipe. Solenoid valves are arranged on both the twelfth pipeline and the thirteenth pipeline. A solenoid valve V13 is arranged on the fourteenth pipeline. A liquid charging bypass pipe is connected to the fourteenth pipeline between the electromagnetic three-way valve V21 and the solenoid valve V13. The other end of the liquid charging bypass pipe is connected to a liquid pumping and injection pipe, and a solenoid valve V29 is arranged on the liquid pumping bypass pipe.

[0016] Preferably, the second purification mechanism includes an impurity filter, in which a plurality of perforated partitions are arranged in parallel up and down, and each perforated partition is filled with a filtering material.

[0017] Preferably, a first vacuum pump is arranged on the first pipeline, and a second vacuum pump is arranged on the liquid pumping and injection pipe.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention has an oil separator, an impurity removal function and a deep vacuum degree.

[0020] 2. The present invention has an ultra-large air-cooled condenser, which can achieve a high heat exchange rate.

[0021] 3. The present invention can operate continuously for 24 hours in a working cycle.

[0022] 4. The present invention can push the liquid refrigerant out of the storage tank by the gaseous refrigerant without disconnecting the hose connection.

[0023] 5. The present invention realizes the filtration and purification of the gaseous refrigerant through a constant pressure container and a purification container, and can supply the filtered lubricating oil to the purification container for the lubrication of the purification container itself, reducing the wear of the purification container.

[0024] 6. The present invention can complete the purification work of the refrigerant while extracting the refrigerant through the first purification mechanism. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the present invention.

[0026] Figure 2 is a schematic diagram of the recovery direction of the gaseous refrigerant of the present invention.

[0027] Figure 3It is a schematic diagram of the gas refrigerant charging direction of the present invention.

[0028] Figure 4 It is a schematic diagram of the liquid refrigerant recovery and charging direction of the present invention.

[0029] Figure 5 It is a schematic cross-sectional structure diagram of the first purification mechanism of the present invention.

[0030] In the figure: 1 - storage tank, 2 - dispatching cabinet, 3 - first purification mechanism, 4 - first flange, 5 - second flange, 6 - first condenser, 7 - first oil separator, 8 - second oil separator, 9 - first-stage compressor, 10 - temperature controller, 11 - second-stage compressor, 12 - third-stage compressor, 13 - second condenser, 14 - four-way ball valve, 15 - first pipeline, 16 - gas charging bypass pipe, 17 - second pipeline, 18 - third pipeline, 19 - fourth pipeline, 20 - first branch pipe, 21 - first bypass pipe, 22 - fifth pipeline, 23 - sixth pipeline, 24 - seventh pipeline, 25 - eighth pipeline, 26 - second branch pipe, 27 - ninth pipeline, 28 - tenth pipeline, 29 - eleventh pipeline, 30 - second-stage bypass outlet pipe, 31 - second-stage bypass inlet pipe, 32 - third branch pipe, 33 - first vacuum pump, 34 - dispatching vacuum pump, 35 - second vacuum pump, 36 - impurity filter, 37 - twelfth pipeline, 38 - thirteenth pipeline, 39 - fourteenth pipeline, 40 - second bypass pipe, 41 - third bypass pipe, 42 - liquid charging bypass pipe, 301 - reciprocating drive structure, 302 - movable pipe, 303 - base, 304 - connecting pipe, 305 - first air pipe, 306 - intake pipe, 307 - constant pressure vessel, 308 - second air pipe, 309 - first filter plate, 310 - upper air chamber, 311 - arched top, 312 - intake nozzle, 313 - hollow piston, 314 - lower air chamber, 315 - second filter plate, 316 - equipment chamber. Detailed implementation mode

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. By describing these implementation examples in sufficient detail, those skilled in the art can understand and practice the present invention. Without departing from the gist and scope of the present invention, logical, implementation, and other changes can be made to the implementation. Therefore, the following detailed description should not be construed in a limiting sense, and the scope of the present invention is only defined by the claims.

[0032] As Figures 1-5 shown, it includes:

[0033] A storage container for storing refrigerant;

[0034] The first pumping mechanism for recovering and charging gaseous refrigerant. One end of the first pumping mechanism is connected to a storage container, and the other end is connected to a first purification mechanism 3. The first purification mechanism 3 is connected to the refrigeration system through a first pipeline 15, and the first pipeline 15 is connected to the refrigeration system through a first flange 4.

[0035] The second pumping mechanism for recovering and charging liquid refrigerant. One end of the second pumping mechanism is connected to a storage container, and the other end is connected to a second purification mechanism. The second purification mechanism is connected to the refrigeration system through a liquid pumping pipe, and the liquid pumping pipe is connected to the refrigeration system through a second flange 5.

[0036] In order to realize the filtration and purification of gaseous refrigerant including but not limited to impurities such as fine metal particles and oil gas while recovering gaseous refrigerant, the first purification mechanism 3 includes a base 303 provided with a constant pressure container 307. The constant pressure container 307 is connected to the first pipeline 15 through an intake pipe 306. The constant pressure container 307 plays a role of temporarily storing gaseous refrigerant and balancing the air pressure of the two pipelines of the purification container.

[0037] A purification container is provided on one side of the constant pressure container 307. Both the upper and lower ends of the purification container are connected to the constant pressure container 307 through pipelines, and solenoid valves are provided on the pipelines. For the convenience of description, the pipeline at the upper end of the purification container is named the second air pipe 308, the solenoid valve on the second air pipe 308 is named solenoid valve V24, the pipeline at the lower end of the purification container is named the first air pipe 305, the solenoid valve on the first air pipe 305 is named V25, and the solenoid valve V24 and solenoid valve V25 can be selected as one-way valves.

[0038] Filter structures are symmetrically arranged up and down in the purification container. For the convenience of description, the filter plate of the filter structure in the upper part of the purification container is named the first filter plate 309, the filter plate of the filter structure in the lower part of the purification container is named the second filter plate 315, and a hollow piston 313 is movably arranged between the two filter structures.

[0039] A sealing ring is provided between the outer side wall of the hollow piston 313 and the inner side wall of the purification container, and one-way intake structures are provided at both the upper and lower ends of the hollow piston 313. An intake nozzle 312 is provided inside the hollow piston 313.

[0040] The base 303 is provided with an equipment cavity 316. A reciprocating driving structure 301 is arranged in the equipment cavity 316. The movable end of the reciprocating driving structure 301 is connected to a movable pipe 302. The top end of the movable pipe 302 faces upward and sequentially penetrates into the purification container to be connected to the intake nozzle 312. The top end of the movable pipe 302 faces upward and sequentially penetrates the lower end surface of the purification container, the second filter plate 315, and the lower end surface of the hollow piston 313 to be connected to the intake nozzle 312. Sealing rings are provided between the lower end surface of the purification container, the second filter plate 315 and the movable pipe 302 to prevent the leakage of gaseous refrigerant.

[0041] A connecting pipe 304 is inserted through one side of the device cavity 316. One end of the connecting pipe 304 is connected to the lower section of the movable pipe 302 through an expansion pipe, and the other end is connected to the first pumping mechanism. The other end of the connecting pipe 304 is connected to the electromagnetic three-way valve V18 of the first pumping mechanism. The connecting pipe 304 is connected to the second pipe 17 through the electromagnetic three-way valve V18.

[0042] The expansion pipe is an elastic expansion pipe, which is fixed at the connection with the movable pipe 302, and always remains inside the device cavity 316 when the hollow piston 313 moves to the upper and lower ends of the purification container. And the expansion pipe can move with the movable pipe 302 without interfering with the connecting pipe 304, and is used to input the gaseous refrigerant in the movable pipe 302 into the connecting pipe 304.

[0043] A gaseous charging bypass pipe 16 is connected to the connecting pipe 304, and the other end of the gaseous charging bypass pipe 16 is connected to the first pipe 15. Solenoid valves are provided on the intake pipe 306, the connecting pipe 304 and the gaseous charging bypass pipe 16. A solenoid valve V23 is provided on the intake pipe 306, and a solenoid valve V28 is provided on the connecting pipe 304. A gaseous charging bypass pipe 16 is connected to the connecting pipe 304 between the solenoid valve V28 and the electromagnetic three-way valve V18. A solenoid valve V22 is provided on the gaseous charging bypass pipe 16. Under certain circumstances, the first purification mechanism 3 can replace the function of the first vacuum pump 33 to realize pumping the refrigerant in the refrigeration mechanism into the first pumping mechanism.

[0044] In order to facilitate the utilization of the purified and filtered oil and gas (generally lubricating oil) and reduce the wear of the sealing ring, in this embodiment, an arched top 311 is provided at the top of the hollow piston 313. The filtering structure includes a filter plate movably installed in the purification container. Sealing rings are sleeved on the outer periphery of the filter plate. Filter cotton is embedded in the filter plate. A spring is provided between the end of the filter plate far from the hollow piston 313 and the corresponding end of the purification container. A fixing ring for clamping the spring is provided on the purification container.

[0045] The one-way intake structure includes an intake port and a one-way valve provided on the intake port. For the convenience of description, the one-way valve at the upper end of the hollow piston 313 is named one-way valve V26, and the one-way valve at the lower end of the hollow piston 313 is named one-way valve V27 (the one-way valves V26 and V27 can adopt simple spring one-way valves).

[0046] When the arched top 311 at the top of the hollow piston 313 pushes the first filter plate 309 upward, the filter cotton in the first filter plate 309 can be exactly squeezed by the cooperation of the arched top 311 and the fixed ring on the inner top surface of the purification container, squeezing out the oil liquid adsorbed and solidified with oil gas in the filter cotton (generally the lubricating oil from the compressor of the refrigeration system), flowing along the arched top 311 to the side of the hollow piston 313, lubricating the sealing ring on the outer periphery of the hollow piston 313 and reducing its wear. When the bottom end of the hollow piston 313 pushes the second filter plate 315 downward, the filter cotton of the second filter plate 315 can be squeezed by the bottom end of the hollow piston 313 and the fixed ring on the inner bottom surface of the purification container, so as to squeeze out the oil liquid in the filter cotton. The oil liquid squeezed out by the filter cotton of the second filter plate 315 can lubricate the outer periphery of the movable pipe 302, reducing the wear of the sealing rings between the second filter plate 315 and the movable pipe 302 and between the lower end of the purification container and the movable pipe 302.

[0047] In order to facilitate the recovery and refilling of gaseous refrigerant using the same set of pipelines, in this embodiment, the first pumping mechanism includes a second pipeline 17 with an electromagnetic three-way valve V18 provided at one end. The second pipeline 17 is connected to the connecting pipe 304 through the electromagnetic three-way valve V18. The first valve port of the electromagnetic three-way valve V18 is connected to the connecting pipe 304 of the first purification mechanism 3, the second valve port is connected to the second pipeline 17, and the third valve port is connected to the tenth pipeline 28 through a branch pipe.

[0048] The other end of the second pipeline 17 is connected to the first port of the four-way ball valve 14 through a third pipeline 18. The second port of the four-way ball valve 14 is connected to a first oil separator 7 through a fourth pipeline 19. The first port and the second port of the four-way ball valve 14 are communicated with each other.

[0049] The first oil separator 7 is connected to a first compressor unit through a fifth pipeline 22. The first compressor unit is connected to a first condenser 6 through a sixth pipeline 23. A second oil separator 8 is provided at the outlet end of the first condenser 6. The second oil separator 8 is connected to a second compressor unit through a seventh pipeline 24. The second compressor unit is connected to the third port of the four-way ball valve 14 through an eighth pipeline 25. The fourth port of the four-way ball valve 14 is connected to a second condenser 13 through a ninth pipeline 27. The third port and the fourth port of the four-way ball valve 14 are communicated with each other.

[0050] The second condenser 13 is connected to an electromagnetic three-way valve V19 through a tenth pipeline 28. One valve port of the electromagnetic three-way valve V19 is communicated with a storage container through an eleventh pipeline 29, and the other valve port is connected to the third pipeline 18. A branch pipe communicating with the electromagnetic three-way valve V18 is provided on the tenth pipeline 28. The first valve port of the electromagnetic three-way valve V19 is connected to the eleventh pipeline 29, the second valve port is connected to the tenth pipeline 28, and the third valve port is connected to the third pipeline 18. A branch pipe communicating with the electromagnetic three-way valve V18 is provided on the tenth pipeline 28.

[0051] To prevent damage to the compressor, in this embodiment, the first compressor unit includes a first-stage compressor 9 and a second-stage compressor 11. The inlet of the first-stage compressor 9 is connected to the fifth pipeline 22, and the outlet of the first-stage compressor 9 is connected to the sixth pipeline 23. The inlet of the second-stage compressor 11 is connected to the fifth pipeline 22 through a second-stage bypass inlet pipe 31, and the outlet of the second-stage compressor 11 is connected to the sixth pipeline 23 through a second-stage bypass outlet pipe 30. The second compressor unit includes a third-stage compressor 12. The inlet of the third-stage compressor 12 is connected to the seventh pipeline 24, and the outlet of the third-stage compressor 12 is connected to the eighth pipeline 25.

[0052] Both the first compressor unit and the second compressor unit are located in a temperature control box, and a temperature controller 10 is provided on the temperature control box. One end of the temperature control box is connected to a one-way valve V17. When the temperature exceeds the limit, the temperature control box transmits a signal to the control end, and the control end stops the operation of the first compressor unit and the second compressor unit.

[0053] To facilitate the control of the states of specific "refrigerant recovery", "non-condensable gas discharge", "refrigerant purification", "liquid natural filling", "liquid pressurized filling", and "gas filling", in this embodiment, a solenoid valve V14 is provided on the first pipeline 15, a solenoid valve V1 is provided on the third pipeline 18, a pressure gauge and a suction pressure regulating valve V4 are sequentially provided on the fourth pipeline 19, and a first branch pipe 20 is connected between the fourth pipeline 19 and the suction pressure regulating valve V4 and the pressure gauge.

[0054] The other end of the first branch pipe 20 is connected to the second oil separator 8, and a solenoid valve V16 is provided on the first branch pipe 20. A first bypass pipe 21, a pressure gauge, a pressure controller, and a pressure reducing valve V7 are sequentially provided on the fifth pipeline 22. The first bypass pipe 21 is connected to the first branch pipe 20 between the fourth pipeline 19 and the solenoid valve V16. A solenoid valve V8 is provided on the first bypass pipe 21.

[0055] A second branch pipe 26 is connected to the eighth pipeline 25, and a second-stage pressure controller, a pressure gauge, and a pressure reducing valve V5 are sequentially provided on the second branch pipe 26. A third branch pipe 32 is connected to the sixth pipeline 23, and a first-stage pressure controller, a pressure gauge, and a pressure reducing valve V15 are provided on the third branch pipe 32. The first oil separator 7 is provided with a sight glass and an oil and liquid discharge valve V6. A solenoid valve V2 is provided on the tenth pipeline 28.

[0056] In order to increase the storage capacity and be able to operate at least two refrigeration systems simultaneously, in this embodiment, the storage container includes at least two storage tanks 1. The upper part of each storage tank 1 is connected to the eleventh pipe 29 through the twelfth pipe 37, and a second pumping mechanism is provided at the lower part of each storage tank 1. The second pumping mechanism includes a thirteenth pipe 38, and the thirteenth pipe 38 is connected to the second purification mechanism through a fourteenth pipe 39.

[0057] In order to avoid the situation where when one or more of the multiple storage tanks 1 leak, the refrigerant cannot be quickly transferred to other storage tanks 1, in this embodiment, the second pumping mechanism further includes a dispatching cabinet 2. An electromagnetic three-way valve V20 and an electromagnetic three-way valve V21 are arranged in the dispatching cabinet 2. The eleventh pipe 29 is communicated with two twelfth pipes 37 through the electromagnetic three-way valve V20, and the fourteenth pipe 39 is communicated with two thirteenth pipes 38 through the electromagnetic three-way valve V21. A dispatching vacuum pump 34 is also arranged in the dispatching cabinet 2, and the dispatching vacuum pump 34 is connected to the twelfth pipe 37 and the thirteenth pipe 38 respectively through a dispatching pipe.

[0058] Solenoid valves are arranged on both the twelfth pipe 37 and the thirteenth pipe 38, and a solenoid valve V13 is arranged on the fourteenth pipe 39. A liquid charging bypass pipe 42 is connected to the fourteenth pipe 39 between the electromagnetic three-way valve V21 and the solenoid valve V13, and the other end of the liquid charging bypass pipe 42 is connected to a liquid pumping pipe. A solenoid valve V29 is arranged on the liquid pumping bypass pipe.

[0059] For the convenience of description, the solenoid valve on the twelfth pipe 37 of one of the storage tanks 1 is named solenoid valve V9, the solenoid valve on the twelfth pipe 37 of the other storage tank 1 is named solenoid valve V10, the solenoid valve on the thirteenth pipe 38 of one of the storage tanks 1 is named solenoid valve V11, and the solenoid valve on the thirteenth pipe 38 of the other storage tank 1 is named solenoid valve V12.

[0060] For the convenience of disassembly and connection, the twelfth pipe 37 and the thirteenth pipe 38 are respectively split into two sections. One section is provided with a solenoid valve and is connected to the storage tank 1, and the other section is connected to the dispatching pipe and the electromagnetic three-way valve. The two sections of pipes are fixedly connected through a flange, and the flange is installed on the side wall of the dispatching cabinet 2.

[0061] When it is necessary to recover the refrigerant of two refrigeration systems simultaneously, the second flange 5 can be connected to the liquid recovery ports of the two refrigeration systems through a three-way valve, or the thirteenth pipe 38 can be removed from the dispatching cabinet 2 and connected to the liquid recovery ports of the two refrigeration systems respectively. For the convenience of description, the dispatching pipe connected to the thirteenth pipe 38 is named the second bypass pipe 40, and the dispatching pipe connected to the twelfth pipe 37 is named the third bypass pipe 41.

[0062] In order to filter and remove impurities from the injected liquid refrigerant, in this embodiment, the second purification mechanism includes an impurity filter 36. A number of perforated partitions are arranged in parallel up and down in the impurity filter 36, and each perforated partition is filled with a filtering material. The second purification mechanism can also adopt the structure of the first purification mechanism 3.

[0063] In this embodiment, a first vacuum pump 33 is arranged on the first pipeline 15, and a second vacuum pump 35 is arranged on the liquid injection pipe. The first vacuum pump 33 sucks the gaseous refrigerant from the first flange 4 into the first pipeline 15 to start the recovery; the second vacuum pump 35 sucks the liquid refrigerant from the second flange 5. Evacuating can not only further check the airtightness of the refrigeration system, but also remove air, moisture and other non-condensable gases in the refrigeration system, preparing for refrigerant filling of the system.

[0064] Since the hollow piston 313 forms a vacuum negative pressure state in the upper air chamber 310 and the lower air chamber 314 when moving up and down, gaseous refrigerant will be sucked from the constant pressure container 307. Therefore, a negative pressure will be formed in the constant pressure container 307, and gaseous refrigerant will be sucked from the refrigeration system. That is, to a certain extent, the first purification mechanism 3 can achieve the function of the first vacuum pump 33. If the second purification mechanism adopts the structure of the first purification mechanism 3, the second purification mechanism can achieve the function of the second vacuum pump 35 to a certain extent.

[0065] The principle and advantages of the present invention:

[0066] When it is necessary to recover the refrigerant of the refrigeration system, first connect the first flange 4 to the gaseous refrigerant recovery port of the refrigeration system, and connect the second flange 5 to the liquid refrigerant recovery port of the refrigeration system. Start the second vacuum pump 35 to pump the liquid refrigerant in the refrigeration system from the second flange 5 into the liquid injection tube. At this time, the solenoid valve V29 on the liquid injection bypass tube 42 is closed, and the liquid injection tube is connected to the inlet of the impurity filter 36. The liquid refrigerant flows through several perforated compartments of the impurity filter 36 in sequence. Among them, the metal filings, lubricating oil, moisture, etc. that fall off from the pipeline and are mixed in the liquid refrigerant are adsorbed by the wire mesh, filter cotton, etc. filled in the perforated compartments, so that the liquid refrigerant flowing out of the outlet of the impurity filter 36 is purified of impurities. The purified liquid refrigerant is drawn into two storage tanks 1 through the fourteenth pipeline 39 (the solenoid valve V13 on the fourteenth pipeline 39 is opened) and the electromagnetic three-way valve V21 through the thirteenth pipelines 38 on both sides (the solenoid valves V11 / solenoid valve V12 on the thirteenth pipeline 38 are opened), completing the recovery and purification of the liquid refrigerant. After the liquid refrigerant is recovered, the second vacuum pump 35 stops operating, and the first vacuum pump 33 starts operating. The gaseous refrigerant is drawn into the first pipeline 15 from the first flange 4 (the solenoid valve V14 on the first pipeline 15 is opened, and the solenoid valve V22 on the gaseous injection bypass tube 16 is closed). The gaseous refrigerant is drawn into the constant pressure container 307 through the intake pipe 306. At this time, the solenoid valve V23 on the intake pipe 306 is opened, and the solenoid valve V23 can be a constant pressure valve to ensure that the pressure in the constant pressure container 307 is constant automatically (constant pressure valve) or manually (close the solenoid valve V23 when the pressure in the constant pressure container 307 reaches the set value). The reciprocating drive structure 301 pushes the movable tube 302 upward, and the movable tube 302 drives the hollow piston 313 to move upward along the inner wall of the purification container. Because there is a sealing ring on the outer periphery of the hollow piston 313, the gaseous refrigerant in the upper gas chamber 310 will not enter the lower gas chamber 314 (for the convenience of description, the space of the purification container above the hollow piston 313 is named the upper gas chamber 310, and the space of the purification container below the hollow piston 313 is named the lower gas chamber 314). Since the solenoid valve V24 can be selected as a one-way valve (when the one-way valve is not selected, it opens when the hollow piston 313 moves downward and closes when the hollow piston 313 moves upward, and the solenoid valve V23 is reversed), therefore, the gaseous refrigerant in the constant pressure container 307 will not enter the upper gas chamber 310, and the gaseous refrigerant in the upper gas chamber 310 will enter the hollow piston 313 through the one-way valve V26, and then enter the movable tube 302 through the intake nozzle 312, and then enter the connecting tube 304 through the contraction tube (the solenoid valve V28 on the connecting tube 304 can be a one-way valve), and finally enter the second pipeline 17 through the electromagnetic three-way valve V18.

[0067] While the hollow piston 313 moves upward, the lower air chamber 314 is in a negative pressure state. The gaseous refrigerant in the constant pressure container 307 enters the lower air chamber 314 of the purification container through the first air pipe 305. At this time, since the pressure of the gaseous refrigerant in the lower air chamber 314 is not enough, it will not enter the hollow piston 313 from the one-way valve V27. Similarly, when the reciprocating drive structure 301 pulls the hollow piston 313 downward, since all the gaseous refrigerant in the upper air chamber 310 flows into the second pipe 17 through the air inlet nozzle 312, the upper air chamber 310 is in a negative pressure state at this time. The gaseous refrigerant in the constant pressure container 307 will enter the upper air chamber 310 through the second air pipe 308, and the gaseous refrigerant in the first pipe 15 will be replenished into the constant pressure container 307. The gaseous refrigerant in the lower air chamber 314 will enter the second pipe 17 through the air inlet nozzle 312, the movable pipe 302, and the connecting pipe 304. When the constant pressure container 307 enters the upper air chamber 310 or the lower air chamber 314, since the upper air chamber 310 or the lower air chamber 314 is in a negative pressure state during intake, on the one hand, it will extract the gaseous refrigerant from the constant pressure container 307 by means of the pressure difference, and on the other hand, it can accelerate the speed of the gaseous refrigerant passing through the filtering structure.

[0068] When the top of the hollow piston 313 pushes the first filter plate 309 to move slightly upward, it cooperates with the fixed ring of the spring fixed to the inner bottom surface of the purification container to squeeze the filter cotton embedded in the first filter plate 309, so that the squeezed lubricating oil will flow along the arched top 311 to the periphery of the hollow piston 313 to complete lubrication and reduce the wear of the sealing ring. Similarly, when the hollow piston 313 moves downward, it will squeeze the filter cotton of the second filter plate 315 with the fixed ring on the inner bottom surface of the purification container, so that the squeezed lubricating oil will lubricate the movable pipe 302 and reduce the wear of the sealing rings between the second filter plate 315 and the movable pipe 302, and between the bottom end of the purification container and the movable pipe 302.

[0069] After the gaseous refrigerant enters the second pipe 17, it will enter the fourth pipe 19 along the third pipe 18 through the first port and the second port of the four-way valve, and enter the first oil separator 7 through the fourth pipe 19. The solenoid valve V1 on the third pipe 18 is opened, the suction pressure regulating valve V4 on the fourth pipe 19 is opened, the solenoid valve V16 on the first branch pipe 20 is closed, and the solenoid valve V8 on the first bypass pipe 21 is closed. When saving time, the solenoid valve V8 is opened and the gaseous refrigerant can directly enter the fifth pipe 22 through the first bypass pipe 21, or the solenoid valve V16 is opened and the gaseous refrigerant enters the second oil separator 8 through the first branch pipe 20.

[0070] The gaseous refrigerant in the first oil separator 7 enters the first-stage compressor 9 through the fifth pipeline 22, and the gaseous refrigerant in the fifth pipeline 22 enters the second-stage compressor 11 through the second-stage bypass inlet pipe 31. After being pressurized by the second-stage compressor 11, it enters the sixth pipeline 23 through the second-stage bypass outlet pipe 30. The high-pressure gas coming out of the first-stage compressor 9 and the second-stage compressor 11 is input into the first condenser 6 through the sixth pipeline 23. In the first condenser 6, the high-pressure gas is converted into normal-pressure gas and then input into the second oil separator 8, and then input into the third-stage compressor 12 through the seventh pipeline 24. The third-stage compressor 12 converts it into high-pressure gas and enters the second condenser 13 through the eighth pipeline 25, the third port, the fourth port of the four-way valve, and the ninth pipeline 27. It is converted into liquid refrigerant and flows into the storage tank 1 from the tenth pipeline 28 through the electromagnetic three-way valve V19, the eleventh pipeline 29, the electromagnetic three-way valve V20, and the twelfth pipeline 37. The solenoid valves V2, V3, and V9 are opened to complete the recovery and purification of the gaseous refrigerant.

[0071] When refrigerant charging is required, the first flange 4 and the second flange 5 are also connected to the refrigeration system. The liquid refrigerant is injected into the refrigeration system through the thirteenth pipeline 38, the electromagnetic three-way valve V21, the liquid charging bypass pipe 42, the liquid pumping and injection pipe, and the first flange 4 by the second vacuum pump 35. At this time, the solenoid valve V11 and the solenoid valve V29 are opened, and the solenoid valve V13 is closed. When charging, the liquid refrigerant does not flow through the impurity filter 36, which can prevent the impurities filtered previously from flowing back into the refrigeration system.

[0072] When the liquid refrigerant in the storage tank 1 is almost exhausted (because part of the liquid refrigerant will turn into gaseous refrigerant after being injected into the refrigeration system), the first vacuum pump 33 is turned on at this time to recover the gaseous refrigerant. However, during this recovery process, the fans of the first condenser 6 and the second condenser 13 are not turned on. Therefore, the high-pressure gaseous refrigerant coming out of the second condenser 13 at the end. The high-pressure gaseous refrigerant is pumped into the storage tank 1, thereby squeezing out the liquid refrigerant in the storage tank 1 to complete the charging of the liquid refrigerant, and then entering the charging of the gaseous refrigerant.

[0073] The first vacuum pump 33 operates, and the gaseous refrigerant flows from the storage tank 1 through the twelfth pipeline 37, solenoid valve V9 / solenoid valve V10, electromagnetic three-way valve V20, eleventh pipeline 29, electromagnetic three-way valve V19, third pipeline 18, solenoid valve V1, four-way valve, fourth pipeline 19, suction pressure regulating valve V4, first oil separator 7, fifth pipeline 22, first-stage compressor 9 / second-stage compressor 11, sixth pipeline 23, first condenser 6, second oil separator 8, seventh pipeline 24, third-stage compressor 12, eighth pipeline 25, four-way valve, ninth pipeline 27, second condenser 13, solenoid valve V2, tenth pipeline 28, branch pipe, electromagnetic three-way valve V18, gaseous charging bypass pipe 16, solenoid valve V22, first pipeline 15, solenoid valve V14, and first flange 4 and is charged into the refrigeration system. When in a hurry and there is no impurity in the refrigerant, it can directly enter the second oil separator 8 from the first branch pipe 20 in the fourth pipeline 19 or enter the fifth pipeline 22 through the first bypass pipe 21.

[0074] When the operating current of the motor exceeds 18 amperes, the machine automatically shuts down. When the exhaust temperature of the compressor unit exceeds 120 degrees Celsius, the compressor will be blocked and the system will automatically shut down. When the exhaust pressure of the first-stage pressure controller reaches 2.4 Mpa, the machine automatically shuts down. When the exhaust pressures of the first-stage and second-stage pressure controllers reach 3.8 Mpa, the machine automatically shuts down.

[0075] When one of the storage tanks 1 leaks, the solenoid valves V3 and V13 can be closed so that the thirteenth pipeline 38 and the twelfth pipeline 37 form a closed pipeline. At this time, the refrigerant in the leaking storage tank 1 can be quickly pumped into other storage tanks 1 through the scheduling vacuum pump 34 via the twelfth pipeline 37, thirteenth pipeline 38, second bypass pipe 40, and third bypass pipe 41.

[0076] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0077] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0078] It is not possible to describe all possible combinations of components or methods for describing the above embodiments, but those of ordinary skill in the art should recognize that each embodiment can be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. In addition, with respect to the term "comprising" as used in the specification or claims, the word is to be construed in a manner similar to the term "including", as that term is interpreted when used as a transitional word in a claim. Further, any use of the term "or" in the specification or claims is to mean "non-exclusive or".

Claims

1. A device for refrigerant recovery, purification and charging, characterized in that, Comprising: A storage container for storing refrigerant; A first pumping mechanism for recovering and charging gaseous refrigerant, one end of the first pumping mechanism is connected to the storage container, and the other end is connected to a first purification mechanism (3), and the first purification mechanism (3) is connected to the refrigeration system through a first pipeline (15); A second pumping mechanism for recovering and charging liquid refrigerant, one end of the second pumping mechanism is connected to the storage container, and the other end is connected to a second purification mechanism, and the second purification mechanism is connected to the refrigeration system through a liquid pumping pipe; The first purification mechanism (3) includes a base (303) provided with a constant pressure container (307), the constant pressure container (307) is connected to the first pipeline (15) through an air inlet pipe (306), a purification container is arranged on one side of the constant pressure container (307), both the upper and lower ends of the purification container are connected to the constant pressure container (307) through pipelines, solenoid valves are arranged on the pipelines, filtering structures are symmetrically arranged up and down in the purification container, a hollow piston (313) is movably arranged between the two filtering structures, a sealing ring is arranged between the outer side wall of the hollow piston (313) and the inner side wall of the purification container, one-way air inlet structures are arranged at both the upper and lower ends of the hollow piston (313), and an air inlet nozzle (312) is arranged in the hollow piston (313); an equipment cavity (316) is formed in the base (303), a reciprocating driving structure (301) is arranged in the equipment cavity (316), the movable end of the reciprocating driving structure (301) is connected to a movable pipe (302), the top end of the movable pipe (302) faces upward and sequentially penetrates into the purification container to be connected to the air inlet nozzle (312), a connecting pipe (304) is inserted through one side of the equipment cavity (316), one end of the connecting pipe (304) is connected to the lower section of the movable pipe (302) through a telescopic pipe and the other end is connected to the first pumping mechanism, a gaseous charging bypass pipe (16) is connected to the connecting pipe (304), the other end of the gaseous charging bypass pipe (16) is connected to the first pipeline (15), and solenoid valves are arranged on the air inlet pipe (306), the connecting pipe (304) and the gaseous charging bypass pipe (16).

2. The refrigerant recovery, purification, and charging device according to claim 1, characterized in that, An arched top (311) is arranged at the top end of the hollow piston (313), the filtering structure includes a filter plate movably installed in the purification container, sealing rings are sleeved on the outer periphery of the filter plate, filter cotton is embedded in the filter plate, a spring is arranged between the end of the filter plate away from the hollow piston (313) and the corresponding end of the purification container, a fixing ring for clamping the spring is arranged on the purification container, and the one-way air inlet structure includes an air inlet and a one-way valve arranged on the air inlet.

3. The refrigerant recovery, purification, and charging device according to claim 1, characterized in that, The first pumping mechanism includes a second pipeline (17) with an electromagnetic three-way valve V18 provided at one end. The second pipeline (17) is communicated with a connecting pipe (304) through the electromagnetic three-way valve V18. The other end of the second pipeline (17) is communicated with the first port of a four-way ball valve (14) through a third pipeline (18). The second port of the four-way ball valve (14) is connected with a first oil separator (7) through a fourth pipeline (19). The first oil separator (7) is connected with a first compressor unit through a fifth pipeline (22). The first compressor unit is connected with a first condenser (6) through a sixth pipeline (23). A second oil separator (8) is provided at the outlet end of the first condenser (6). The second oil separator (8) is connected with a second compressor unit through a seventh pipeline (24). The second compressor unit is docked with the third port of the four-way ball valve (14) through an eighth pipeline (25). The fourth port of the four-way ball valve (14) is connected with a second condenser (13) through a ninth pipeline (27). The second condenser (13) is connected with an electromagnetic three-way valve V19 through a tenth pipeline (28). One valve port of the electromagnetic three-way valve V19 is communicated with a storage container through an eleventh pipeline (29), and the other valve port is connected with the third pipeline (18). A branch pipe communicated with the electromagnetic three-way valve V18 is provided on the tenth pipeline (28).

4. The refrigerant recovery, purification, and charging device according to claim 3, characterized in that, The first compressor unit includes a first-stage compressor (9) and a second-stage compressor (11). The inlet of the first-stage compressor (9) is connected with the fifth pipeline (22), and the outlet of the first-stage compressor (9) is connected with the sixth pipeline (23). The inlet of the second-stage compressor (11) is connected with the fifth pipeline (22) through a second-stage bypass inlet pipe (31), and the outlet of the second-stage compressor (11) is connected with the sixth pipeline (23) through a second-stage bypass outlet pipe (30). The second compressor unit includes a third-stage compressor (12). The inlet of the third-stage compressor (12) is connected with the seventh pipeline (24), and the outlet of the third-stage compressor (12) is connected with the eighth pipeline (25). Both the first compressor unit and the second compressor unit are located in a temperature control box. A temperature controller (10) is provided on the temperature control box. One end of the temperature control box is connected with a check valve V17.

5. The refrigerant recovery, purification, and charging device according to claim 3, characterized in that, An electromagnetic valve V14 is provided on the first pipeline (15), an electromagnetic valve V1 is provided on the third pipeline (18), a pressure gauge and a suction pressure regulating valve V4 are sequentially provided on the fourth pipeline (19). A first branch pipe (20) is connected between the suction pressure regulating valve V4 and the pressure gauge on the fourth pipeline (19), and the other end of the first branch pipe (20) is connected to the second oil separator (8). An electromagnetic valve V16 is provided on the first branch pipe (20). A first bypass pipe (21), a pressure gauge, a pressure controller and a pressure reducing valve V7 are sequentially provided on the fifth pipeline (22). The first bypass pipe (21) is connected to the first branch pipe (20) between the fourth pipeline (19) and the electromagnetic valve V16. An electromagnetic valve V8 is provided on the first bypass pipe (21). A second branch pipe (26) is connected to the eighth pipeline (25). A secondary pressure controller, a pressure gauge and a pressure reducing valve V5 are sequentially provided on the second branch pipe (26). A third branch pipe (32) is connected to the sixth pipeline (23). A primary pressure controller, a pressure gauge and a pressure reducing valve V15 are provided on the third branch pipe (32). A liquid level sight glass and an oil and liquid discharge valve V6 are provided on the first oil separator (7). An electromagnetic valve V2 is provided on the tenth pipeline (28).

6. The refrigerant recovery, purification, and charging device according to claim 1, characterized in that, The storage container includes at least two storage tanks (1). The upper part of each storage tank (1) is connected to the eleventh pipeline (29) through the twelfth pipeline (37). The second pumping mechanism is provided at the lower part of each storage tank (1). The second pumping mechanism includes a thirteenth pipeline (38), and the thirteenth pipeline (38) is connected to the second purification mechanism through a fourteenth pipeline (39).

7. The refrigerant recovery, purification and charging device according to claim 6, characterized in that, The second pumping mechanism further includes a dispatching cabinet (2). An electromagnetic three-way valve V20 and an electromagnetic three-way valve V21 are provided in the dispatching cabinet (2). The eleventh pipeline (29) is communicated with two twelfth pipelines (37) through the electromagnetic three-way valve V20. The fourteenth pipeline (39) is communicated with two thirteenth pipelines (38) through the electromagnetic three-way valve V21. A dispatching vacuum pump (34) is further provided in the dispatching cabinet (2). The dispatching vacuum pump (34) is connected to the twelfth pipeline (37) and the thirteenth pipeline (38) respectively through a dispatching pipe. Electromagnetic valves are provided on both the twelfth pipeline (37) and the thirteenth pipeline (38). An electromagnetic valve V13 is provided on the fourteenth pipeline (39). A liquid filling bypass pipe (42) is connected to the fourteenth pipeline (39) between the electromagnetic three-way valve V21 and the electromagnetic valve V13. The other end of the liquid filling bypass pipe (42) is connected to a liquid pumping pipe. An electromagnetic valve V29 is provided on the liquid pumping bypass pipe.

8. The refrigerant recovery, purification, and charging device according to claim 1, characterized in that, The second purification mechanism includes an impurity filter (36). A plurality of perforated partitions are arranged in parallel up and down in the impurity filter (36), and each perforated partition is filled with a filtering material.

9. The refrigerant recovery, purification, and charging device according to claim 1, characterized in that, A first vacuum pump (33) is provided on the first pipeline (15), and a second vacuum pump (35) is provided on the liquid pumping pipe.

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