Refrigerant recovery and purification equipment

Abstract

The invention provides refrigerant recovery and purification equipment. The refrigerant recovery and purification equipment comprises a recovery module, a water removal module and an oil removal module. A water removal module and an oil removal module are introduced into the recovery equipment, so that the problem of pollution caused by refrigerant recovery from the device is solved; the flow direction of the valve bank is controlled in the recovery mode, when the quality of a refrigerant to be recovered is high, a direct recovery mode is adopted, only the recovery module is started, and the refrigerant is recovered only through the recovery module; and in the purification and recovery mode, the refrigerant sequentially passes through the water removal module, the oil removal module and the recovery module. Through cooperation of different modules under different conditions, the recovery speed is greatly increased.

Description

Technical Field

[0001] The present invention belongs to the field of refrigerant recovery, and in particular relates to a refrigerant recovery and purification device. Background Art

[0002] With China's accession to the Kigali Amendment to the Montreal Protocol, companies and practitioners in the refrigeration industry are increasingly focusing on the full lifecycle management of refrigerants. Refrigerant recovery technology is crucial in this full lifecycle management of refrigerants.

[0003] Traditional refrigerant recycling often only focuses on recovery efficiency / speed, and does not remove water or oil from the used refrigerant, resulting in the recycled refrigerant being of low quality and unusable.

[0004] This invention divides refrigerant recovery equipment into functional categories, achieving both the removal of moisture, oil, and particulate matter while maintaining high recovery efficiency and speed. This technology can be applied not only to refrigeration systems for high-quality refrigerant recovery but also to refrigerant manufacturers to improve repackaging efficiency.

[0005] At present, the existing relevant technical achievements are mainly as follows:

[0006] (1) A separation and purification device for removing solid impurities and oil from refrigerant (Patent document CN207570167U) This patent document discloses a separation and purification device for removing solid impurities and oil from refrigerant, comprising a hollow body, an outlet at the upper end of the body, a first filter screen and a second filter screen installed at the upper end of the body, a connecting rod connecting the first filter screen and the second filter screen, a first heating rod and a second heating rod arranged below the filter screen, a first sight glass and a second sight glass arranged on the body and at the same level as the first heating rod and the second heating rod, and an oil drain port at the lower end of the body; the first heating rod is hollow, and an inlet is provided at one end. In addition to being able to mix multiple refrigerants without contaminating the refrigerants, it can also achieve internal heating of the oil so that the refrigerant cannot condense into liquid inside, so that no liquid refrigerant will be discharged together with the oil; because two filter screens are installed on the top, impurities cannot enter the compressor cylinder. Although this technical solution achieves the oil removal function, the electric heating method it adopts is less efficient, and the integrated design makes the device very difficult to repair and maintain; moreover, this patent cannot remove the moisture that may be contained in the refrigerant and is only suitable as a link in the refrigerant recovery and purification.

[0007] (2) A refrigerant moisture detection system and a refrigerant filling machine (patent document CN217209929U) This patent document discloses a refrigerant moisture detection system and a refrigerant filling machine, wherein the refrigerant moisture detection system includes a refrigerant filter, a first refrigerant pipeline, a second refrigerant pipeline, a sight glass and a compressor; the refrigerant filter is connected to one end of the sight glass through the first refrigerant pipeline; the refrigerant filter is used to filter the moisture of the refrigerant; the other end of the sight glass is connected to the compressor through the second refrigerant pipeline; the sight glass is used to detect the moisture in the refrigerant pipeline. The system installs a sight glass downstream of the drying filter, detects the moisture content of the filtered liquid through the sight glass, and determines whether the drying filter needs to be replaced. It can quickly detect the moisture content in the refrigerant and judge the filtering effect of the drying filter based on the moisture content, while reducing costs; this technical solution realizes the low-cost refrigerant recovery and water removal function, but cannot remove oil, and is only suitable as a link in the refrigerant recovery and purification.

[0008] Aiming at the technical defects existing in the prior art, in particular the lubricating oil, moisture and solid particles carried as pollutants by the refrigerant after use; the present invention provides a device that can remove the lubricating oil, moisture and solid particles while recovering the refrigerant. Summary of the Invention

[0009] In view of the defects in the prior art, the object of the present invention is to provide a refrigerant recovery and purification device.

[0010] A refrigerant recovery and purification device provided according to the present invention is characterized by comprising: a recovery module;

[0011] The recovery module includes: equipment inlet, A three-way valve, condenser, B three-way valve, equipment outlet, refrigerant recovery tank, C three-way valve, refrigerant pump, D three-way valve;

[0012] The device to be recovered is connected to the inlet of the equipment via a hose;

[0013] The equipment inlet, the A three-way valve, the C three-way valve, the refrigerant pump, the D three-way valve, the B three-way valve, the equipment outlet, and the refrigerant recovery tank are connected through a pipeline with controllable flow direction.

[0014] Preferably, the refrigerant recovery and purification equipment further comprises: at least one of an oil removal module and a water removal module;

[0015] The water removal module and the oil removal module, the water removal module and the recovery module, and the oil removal module and the recovery module are all connected through pipelines.

[0016] Preferably, the water removal module includes: a front sight glass, a three-way pipe A, a drying filter, a rear sight glass, a gas-liquid separator, and a one-way stop valve A;

[0017] The first outlet of the A three-way valve, the front sight glass, the first outlet of the A three-way pipe, the drying filter, the rear sight glass, and the gas-liquid separator are connected in sequence by pipelines;

[0018] The gas-liquid separator has two outlets, a vapor phase outlet and a liquid phase outlet. The vapor phase outlet of the gas-liquid separator is connected to the oil removal module; the liquid phase outlet of the gas-liquid separator is connected to the first outlet of the C three-way valve, and then to the refrigerant pump, the first outlet of the D three-way valve, the A one-way stop valve, and the second outlet of the A three-way pipe in sequence;

[0019] The second outlet of the C three-way valve is connected to the second outlet of the A three-way valve;

[0020] The second outlet of the D three-way valve is connected to the first outlet of the B three-way valve.

[0021] Preferably, the oil removal module includes: a compressor, a refrigerant-oil separator, a C tee pipe, a B one-way stop valve, an oil recovery tank, and a C one-way stop valve;

[0022] The oil removal module connection pipeline starts from the compressor and is connected to the refrigerant-oil separator;

[0023] The refrigerant-oil separator has two outlets, a vapor phase outlet and a liquid phase outlet; the vapor phase outlet of the refrigerant-oil separator is connected to the condenser;

[0024] The liquid phase outlet of the refrigerant-oil separator is connected to the first outlet of the C tee pipe;

[0025] The second outlet of the C tee is connected to the B one-way stop valve and then to the oil recovery tank;

[0026] The third outlet of the C tee is connected to the C one-way stop valve and then to the oil return hole of the compressor;

[0027] The compressor is connected to the water removal module.

[0028] Preferably, the C one-way stop valve in the oil removal module is a component in which a one-way stop valve and a capillary tube are connected in parallel; the capillary tube is responsible for continuous small flow oil return, and the one-way stop valve is responsible for periodic oil return;

[0029] The vapor phase outlet of the gas-liquid separator is connected to a one-way stop valve; when only the water removal module and the recovery module are included or opened, the one-way stop valve is closed;

[0030] The recovery module receives the vapor phase refrigerant from the refrigerant-oil separator, cools it in the condenser, flows through the B three-way valve and the equipment outlet, and then flows into the refrigerant recovery tank.

[0031] Preferably, the refrigerant recovery and purification equipment further comprises: a control system;

[0032] The control system includes: controller A, controller B, controller C, and controller D.

[0033] Preferably, the controller A obtains the liquid level data in the gas-liquid separator and performs start and stop control on the refrigerant pump and the one-way stop valve A so that the liquid level in the gas-liquid separator is not greater than the upper liquid level threshold;

[0034] The controller B obtains the liquid level data in the refrigerant-oil separator and performs start and stop control on the one-way stop valve B so that the liquid level of the lubricating oil separated from the refrigerant does not exceed the upper liquid level threshold.

[0035] Preferably, the controller C obtains the liquid level data of the oil pool in the compressor and starts and stops the C one-way stop valve so that the liquid level of the compressor oil pool is within the working range; when the capillary tube provides continuous oil return, the controller C performs staged oil return to the C one-way stop valve according to the running time to ensure the normal operation of the compressor.

[0036] Preferably, the operation modes of the refrigerant recovery and purification equipment include: direct recovery mode and purification recovery mode;

[0037] The controller D receives a direct recovery mode signal. If the direct recovery mode signal is received, the controller D controls the flow direction of the three-way valve A, the three-way valve B, the three-way valve C, and the three-way valve D, so that the water removal module and the oil removal module are not enabled, and the refrigerant flows directly from the equipment inlet, through the three-way valve A, the three-way valve C, the refrigerant pump, the three-way valve D, the three-way valve B equipment outlet, and enters the refrigerant recovery tank;

[0038] If the controller D does not receive the direct recovery mode signal, it will be in the purification recovery mode, and the refrigerant will pass through the water removal module, the oil removal module and the recovery module in sequence.

[0039] According to a refrigerant recovery and purification method provided by the present invention, the refrigerant recovery and purification equipment provided by the present invention is used, comprising:

[0040] Step S1: In direct recovery mode, only the recovery module is enabled, and the refrigerant flows directly from the equipment inlet, through the A three-way valve, C three-way valve, refrigerant pump, D three-way valve, B three-way valve, equipment outlet, and into the refrigerant recovery tank;

[0041] Step S2: In the purification recovery mode, the refrigerant passes through the water removal module, the oil removal module and the recovery module in sequence according to the control instructions.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention solves the problem of contamination of refrigerant recovered from the device by introducing water removal and oil removal modules into the recovery equipment;

[0044] 2. The present invention controls the flow direction of the valve group by adopting the recovery mode. When the quality of the refrigerant to be recovered is high, the direct recovery mode is adopted to greatly improve the recovery speed;

[0045] 3. The present invention improves the recovery efficiency by introducing multi-phase recovery and coordinating multiple three-way valves;

[0046] 4. The compressor oil replenishment of the present invention adopts a closed automatic control mode, which is precisely controlled according to the feedback of the compressor liquid level sensor, solving the technical problem of difficult selection of oil replenishment timing in the prior art;

[0047] 5. The present invention simplifies the overall configuration of the device through the multifunctional use of multiple components, facilitates production and installation, and reduces the total cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0049] Figure 1 This is a schematic diagram of the device of the present invention.

[0050] Figure 2 It is a schematic diagram of a preferred embodiment of the device of the present invention.

[0051] The figure shows:

[0052] DETAILED DESCRIPTION

[0053] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0054] like Figure 1 As shown, an embodiment of the present invention provides a refrigerant recovery and purification device, including: a recovery module; further, the refrigerant recovery and purification device also includes: at least one of an oil removal module and a water removal module.

[0055] The water removal module and the oil removal module, as well as the oil removal module and the recovery module are all connected through pipelines.

[0056] The recovery module includes: an equipment inlet 2, a three-way valve A 3, a condenser 11, a three-way valve B 12, an equipment outlet 13, a refrigerant recovery tank 14, a three-way valve C 15, a refrigerant pump 16, and a three-way valve D 17; the device to be recovered 1 is connected to the equipment inlet 2 through a hose; the equipment inlet 2, the three-way valve A 3, the three-way valve C 15, the refrigerant pump 16, the three-way valve D 17, the three-way valve B 12, the equipment outlet 13, and the refrigerant recovery tank 14 are connected through a pipeline with controllable flow direction;

[0057] When the refrigerant recovery and purification equipment only includes a recovery module, after the refrigerant flows out of the recovery device 1 through the pipeline, it flows directly from the equipment inlet 2, passes through the A three-way valve 3, the C three-way valve 15, the refrigerant pump 16, the D three-way valve 17, the B three-way valve 12, the equipment outlet 13, and enters the refrigerant recovery tank 14.

[0058] The dewatering module includes: a front sight glass 4, a three-way pipe A 5, a drying filter 6, a rear sight glass 7, a gas-liquid separator 8, and a one-way stop valve A 18;

[0059] Furthermore, the various components of the dewatering module are sequentially connected by pipes. Starting from the recovery device 1, the refrigerant is connected to the equipment inlet 2 via a hose, and then flows sequentially through the first outlet of the A three-way valve 3, the front sight glass 4, the first outlet of the A three-way pipe 5, the drying filter 6, the rear sight glass 7, and the gas-liquid separator 8. The gas-liquid separator 8 has two outlets, a vapor phase and a liquid phase. The vapor phase outlet of the gas-liquid separator 8 is connected to the compressor 9 of the oil removal module. The liquid phase outlet of the gas-liquid separator 8 is connected to the first outlet of the C three-way valve 15, then to the refrigerant pump 16. The liquid phase outlet then flows through the first outlet of the D three-way valve 17, the A one-way stop valve 18, and then to the second outlet of the A three-way pipe 5. The second outlet of the C three-way valve 15 is connected to the second outlet of the A three-way valve 3. The second outlet of the D three-way valve 17 is connected to the first outlet of the B three-way valve 12 of the recovery module. Furthermore, the drying filter 6 is a consumable item and is removable for easy replacement.

[0060] Furthermore, in a preferred example of the refrigerant recovery and purification equipment of the present invention, the vapor phase outlet of the gas-liquid separator 8 is connected to a one-way stop valve; when only the dehydration module and the recovery module are included or opened, the one-way stop valve is closed, and the one-way stop valve and the compressor 9 both have a blocking effect.

[0061] Furthermore, if Figure 2As shown, in a preferred embodiment of the refrigerant recovery and purification device of the present invention, a D one-way stop valve 23 or other equivalent device is provided at the upper end of the gas-liquid separator 8 to prevent undesirable refrigerant reverse flow (from the gas-liquid separator 8 to the rear sight glass 7) when only the oil removal module and the recovery module are working. The D one-way stop valve is provided between the gas-liquid separator 8 and the rear sight glass 7.

[0062] The oil removal module includes: a compressor 9, a refrigerant-oil separator 10, a C three-way pipe 19, a B one-way stop valve 20, an oil recovery tank 21, and a C one-way stop valve 22;

[0063] Furthermore, the oil removal module connection pipeline starts from the compressor 9 and connects to the refrigerant-oil separator 10, which has two outlets: a vapor phase and a liquid phase. The vapor phase outlet of the refrigerant-oil separator 10 is connected to the condenser 11 of the recovery module, and the liquid phase outlet of the refrigerant-oil separator 10 is connected to the first outlet of the C tee 19. The second outlet of the C tee 19 is connected to the B one-way stop valve 20 and then to the oil recovery tank 21. The third outlet of the C tee 19 is connected to the C one-way stop valve 22 and then to the oil return hole of the compressor 9. Furthermore, the C one-way stop valve 22 in the oil removal module can also be a component of a one-way stop valve and a capillary tube in parallel; the capillary tube is responsible for continuous low-flow oil return, and the one-way stop valve is responsible for periodic oil return.

[0064] Furthermore, the recovery module receives vapor-phase refrigerant from the refrigerant-oil separator 10 , cools it in the condenser 11 , passes through the B three-way valve 12 and the equipment outlet 13 , and then flows into the refrigerant recovery tank 14 .

[0065] More specifically, the drying filter 6 in the water removal module is a drying filter assembly connected in parallel or in series; the refrigerant-oil separator 10 in the oil removal module is an assembly of two or more refrigerant-oil separators connected in series.

[0066] Furthermore, the refrigerant recovery and purification equipment provided by the embodiment of the present invention further includes: a control system;

[0067] The control system includes: controller A, controller B, controller C, and controller D;

[0068] The controller A obtains the liquid level data in the gas-liquid separator 8 and performs start and stop control on the refrigerant pump 16 and the A one-way stop valve 18 so that the liquid level in the gas-liquid separator 8 is not greater than the upper liquid level threshold.

[0069] The controller B obtains the liquid level data in the refrigerant-oil separator 10 and performs start and stop control on the B one-way stop valve 20 so that the liquid level of the lubricating oil separated from the refrigerant does not exceed the upper liquid level threshold.

[0070] Controller C acquires the oil sump level data within the compressor and controls the start and stop of one-way stop valve C 22 to ensure the oil sump level remains within the operating range. Furthermore, when one-way stop valve C 22 is a component comprising a capillary tube and a one-way stop valve in parallel, and the capillary tube provides continuous oil return, controller C performs phased oil return to one-way stop valve C 14 based on operating time to ensure the normal operation of compressor 9.

[0071] The controller D receives a direct recovery mode signal. If so, it controls the flow direction of three-way valves A 3, B 12, C 15, and D 17, disabling the dewatering and oil removal modules. The refrigerant flows directly from the device inlet 2, sequentially through the three-way valve A 3, C 15, refrigerant pump 16, D 17, and B 12, to the device outlet 13, and into the refrigerant recovery tank 14. If the controller D does not receive a direct recovery mode signal, the refrigerant enters the purification recovery mode, and the refrigerant passes through the dewatering, oil removal, and recovery modules in sequence.

[0072] An embodiment of the present invention further provides a refrigerant recovery and purification method, which uses the refrigerant recovery and purification equipment provided by the embodiment of the present invention, including:

[0073] Step S1: In direct recovery mode, only the recovery module is enabled, and the refrigerant flows directly from the device inlet 2, sequentially through the A three-way valve 3, the C three-way valve 15, the refrigerant pump 16, the D three-way valve 17, the B three-way valve 12, the device outlet 13, and enters the refrigerant recovery tank 14;

[0074] Step S2: In the purification recovery mode, the refrigerant passes through the water removal module, the oil removal module and the recovery module in sequence according to the control instructions.

[0075] Furthermore, when a direct recovery mode signal is received, the water removal module and the oil removal module are not enabled, and the refrigerant in the device to be recovered 1 flows directly from the device inlet 2, through the A three-way valve 3, the C three-way valve 15, the refrigerant pump 16, the D three-way valve 17, the B three-way valve 12, the device outlet 13, and into the refrigerant recovery tank 14 to complete direct recovery; if the controller D does not receive a direct recovery mode signal, it is in the purification recovery mode, and the refrigerant will enter from the device inlet 2 and pass through the water removal module in sequence (if there is a water removal module in this embodiment), and flow through the A three-way valve 3, the front sight glass 2, the A three-way pipe 5, the drying filter 6, the rear sight glass 7 and the gas-liquid separator 8 in sequence, and flow out from the vapor phase and liquid phase outlets of the gas-liquid separator 8 according to the fluid state. The vapor phase outlet enters the compressor 9 of the oil removal module all the way, and the liquid phase outlet flows into the C three-way valve 15 all the way, and then flows into the refrigerant pump 16, and then flows through the D The three-way valve 17, a part of it flows through the A one-way stop valve 18 and returns to the A three-way pipe 5; the fluid flowing out of the other outlet of the C three-way valve 15 returns to the A three-way valve 3; the other part of it flows through the D three-way valve 17 and flows into the B three-way valve 12 of the recovery module to enter the recovery mode operation; the oil removal purification starts from the compressor 9 and flows into the refrigerant-oil separator 10. After separation, the vapor phase part flows into the condenser 11 of the recovery module from the vapor phase outlet of the refrigerant-oil separator 10, and the liquid phase part flows into the C three-way pipe 19 from the liquid phase outlet of the refrigerant-oil separator 10. The other two routes of the C three-way pipe 19, one flows into the B one-way stop valve 20, and then flows the recovered oil back to the oil recovery tank 21, and the other route flows into the C one-way stop valve 22, and then returns the oil to the oil return hole of the compressor 9 for cyclic oil removal; among them, the capillary part of the C one-way stop valve 22 in the oil removal module is responsible for continuous small flow oil return, and the one-way stop valve part is responsible for periodic oil return. When the device only includes a recovery module and an oil removal module, after the refrigerant enters the device inlet 2, it flows through the A three-way valve 3 and the C three-way valve 15 in sequence, and then enters the gas-liquid separator 8. After the vapor phase enters the compressor 9, it flows into the refrigerant-oil separator 10. After separation, it flows from the vapor phase outlet of the refrigerant-oil separator 10 into the condenser 11 of the recovery module, and the liquid phase flows from the liquid phase outlet of the refrigerant-oil separator 10 into the C three-way pipe 19. The other two paths of the C three-way pipe 19, one flows into the B one-way stop valve 20, and then flows the recovered oil back to the oil recovery tank 21, and the other path flows into the C one-way stop valve 22, and then returns the oil to the oil return hole of the compressor 9 for cyclic oil removal; wherein, the capillary part of the C one-way stop valve 22 in the oil removal module is responsible for continuous small flow oil return, and the one-way stop valve part is responsible for periodic oil return. In a more preferred case, the one-way stop valve at the vapor phase outlet of the gas-liquid separator 8 is connected and closed to block when only the dewatering module and the recovery module are included or opened. During the entire recovery process, the control system controls the flow direction and flow rate.

[0076] In summary, an embodiment of the present invention provides a refrigerant recovery and purification device, comprising: a recovery module, a water removal module, and an oil removal module. By introducing a water removal module and an oil removal module into the recovery device, the problem of contamination of the refrigerant recovered from the device is solved; by adopting a recovery mode to control the flow direction of the valve group, when the quality of the refrigerant to be recovered is high, a direct recovery mode is adopted, and only the recovery module is enabled, and the refrigerant only needs to be recovered through the recovery module; in the purification recovery mode, the refrigerant passes through the water removal module, the oil removal module, and the recovery module in turn. Through the coordinated cooperation of different modules of the present invention in different situations, the recovery speed is greatly improved.

[0077] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0078] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A refrigerant recovery and purification device, characterized in that: include: Recycling module; The recovery module comprises: an equipment inlet (2), a three-way valve A (3), a condenser (11), a three-way valve B (12), an equipment outlet (13), a refrigerant recovery storage tank (14), a three-way valve C (15), a refrigerant pump (16), and a three-way valve D (17); The device to be recovered (1) is connected to the equipment inlet (2) via a hose; The equipment inlet (2), the A three-way valve (3), the C three-way valve (15), the refrigerant pump (16), the D three-way valve (17), the B three-way valve (12), the equipment outlet (13), and the refrigerant recovery tank (14) are connected via a pipeline capable of controlling the flow direction.

2. The refrigerant recovery and purification equipment according to claim 1, characterized in that: Also includes: At least one of an oil removal module and a water removal module; The water removal module and the oil removal module, as well as the oil removal module and the recovery module are all connected through pipelines.

3. The refrigerant recovery and purification equipment according to claim 2, characterized in that: The dewatering module comprises: a front sight glass (4), a three-way pipe A (5), a drying filter (6), a rear sight glass (7), a gas-liquid separator (8), and a one-way stop valve A (18); The first outlet of the A three-way valve (3), the front sight glass (4), the first outlet of the A three-way pipe (5), the drying filter (6), the rear sight glass (7) and the gas-liquid separator (8) are connected in sequence by pipelines; The gas-liquid separator (8) has two outlets, a vapor phase outlet and a liquid phase outlet. The vapor phase outlet of the gas-liquid separator (8) is connected to the oil removal module; the liquid phase outlet of the gas-liquid separator (8) is connected to the first outlet of the C three-way valve (15), and then connected in sequence to the refrigerant pump (16), the first outlet of the D three-way valve (17), the A one-way stop valve (18), and the second outlet of the A three-way pipe (5); The second outlet of the C three-way valve (15) is connected to the second outlet of the A three-way valve (3); The second outlet of the D three-way valve (17) is connected to the first outlet of the B three-way valve (12).

4. The refrigerant recovery and purification equipment according to claim 3, characterized in that: The oil removal module comprises: a compressor (9), a refrigerant-oil separator (10), a C three-way pipe (19), a B one-way stop valve (20), an oil recovery tank (21), and a C one-way stop valve (22); The oil removal module connection pipeline starts from the compressor (9) and is connected to the refrigerant-oil separator (10); The refrigerant-oil separator (10) has two outlets, a vapor phase outlet and a liquid phase outlet; the vapor phase outlet of the refrigerant-oil separator (10) is connected to the condenser (11); The liquid phase outlet of the refrigerant-oil separator (10) is connected to the first outlet of the C tee pipe (19); The second outlet of the C three-way pipe (19) is connected to the B one-way stop valve (20) and then connected to the oil recovery tank (21); The third outlet of the C three-way pipe (19) is connected to the C one-way stop valve (22) and then connected to the oil return hole of the compressor (9); The compressor (9) is connected to the water removal module.

5. The refrigerant recovery and purification equipment according to claim 4, characterized in that: The C one-way stop valve (22) in the oil removal module is a component in which a one-way stop valve and a capillary tube are connected in parallel; the capillary tube is responsible for continuous small flow oil return, and the one-way stop valve is responsible for periodic oil return; The vapor phase outlet of the gas-liquid separator (8) is connected to a one-way stop valve; when only the water removal module and the recovery module are included or opened, the one-way stop valve is closed; The recovery module receives vapor-phase refrigerant from the refrigerant-oil separator (10), cools it in the condenser (11), passes through the B three-way valve (12) and the equipment outlet (13), and then flows into the refrigerant recovery tank (14).

6. The refrigerant recovery and purification equipment according to claim 5, characterized in that: Also includes: control systems; The control system includes: controller A, controller B, controller C, and controller D.

7. The refrigerant recovery and purification equipment according to claim 5, characterized in that: The controller A obtains liquid level data in the gas-liquid separator (8), and performs start-stop control on the refrigerant pump (16) and the A one-way stop valve (18), so that the liquid level in the gas-liquid separator (8) is not greater than the upper liquid level threshold; The controller B obtains the liquid level data in the refrigerant-oil separator (10) and performs start and stop control on the B one-way stop valve (20) so that the liquid level of the lubricating oil separated from the refrigerant does not exceed the upper liquid level threshold.

8. The refrigerant recovery and purification equipment according to claim 5, characterized in that: The controller C obtains the liquid level data of the oil pool in the compressor (9) and performs start-stop control on the C one-way stop valve (22) so that the liquid level of the oil pool of the compressor (9) is within the working range; when the capillary tube provides continuous oil return, the controller C performs staged oil return on the C one-way stop valve (14) according to the operating time to ensure the normal operation of the compressor (9).

9. The refrigerant recovery and purification equipment according to any one of claims 6 to 8, characterized in that: The operation modes of the equipment include: direct recovery mode and purification recovery mode; The controller D receives a direct recovery mode signal. If the direct recovery mode signal is received, the controller D controls the flow direction of the A three-way valve (3), the B three-way valve (12), the C three-way valve (15) and the D three-way valve (17), so that the water removal module and the oil removal module are not activated, and the refrigerant flows directly from the equipment inlet (2), through the A three-way valve (3), the C three-way valve (15), the refrigerant pump (16), the D three-way valve (17), the B three-way valve (12), the equipment outlet (13), and enters the refrigerant recovery tank (14); If the controller D does not receive the direct recovery mode signal, it will be in the purification recovery mode, and the refrigerant will pass through the water removal module, the oil removal module and the recovery module in sequence.

10. A refrigerant recovery and purification method, using the refrigerant recovery and purification equipment according to any one of claims 1 to 9, comprising: Step S1: In direct recovery mode, only the recovery module is enabled, and the refrigerant flows directly from the device inlet (2), sequentially through the A three-way valve (3), the C three-way valve (15), the refrigerant pump (16), the D three-way valve (17), the B three-way valve (12), the device outlet (13), and enters the refrigerant recovery tank (14); Step S2: In the purification recovery mode, the refrigerant passes through the water removal module, the oil removal module and the recovery module in sequence according to the control instructions.

Images