Refrigerant recovery and purification equipment

Abstract

The utility model provides refrigerant recycling and purifying equipment which is characterized by comprising a recycling module, a one-way stop valve and a gas-liquid separator, at least one of an oil removal module and a water removal module; the water removal module is connected with the oil removal module through a pipeline, and the oil removal module is connected with the recovery module through a pipeline; the one-way stop valve is installed between the gas-liquid separator and the water removal module, and the gas-liquid separator is connected into the oil removal module and the recovery module. The water removal module and the oil removal module are introduced into the recovery equipment, so that the problem that pollution exists when refrigerants are recovered from the device is solved, multi-phase recovery is introduced, the flow direction is jointly regulated and controlled through the valve assembly, unexpected flow is avoided, and the recovery efficiency is improved; refrigerants with different qualities are recovered according to local conditions, so that the problem of recovery investment is solved, and the recovery speed is greatly increased; the overall arrangement of the device is integrally simplified, production and installation are convenient, and the total cost of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of refrigerant recovery, specifically to a refrigerant recovery and purification device. Background Technology

[0002] Currently, under the backdrop of China's implementation of the Kigali Amendment, refrigerant life-cycle management is accelerating its efforts to achieve "dual carbon" goals. Among these efforts, refrigerant recovery technology urgently needs upgrading—traditional methods, due to a lack of refining processes, result in substandard quality of recovered materials, making closed-loop utilization difficult.

[0003] Furthermore, while some technical solutions achieve oil removal, their efficiency is low due to complex components or redundant parts, resulting in poor recovery efficiency. Other solutions, while achieving low-cost refrigerant recovery and water removal, cannot remove oil and are only suitable as one step in the refrigerant recovery and purification process. Even some recovery methods that focus on recovery speed cannot simultaneously address water and oil removal, leading to low-quality recovered refrigerant that cannot be used directly.

[0004] Currently, the relevant existing technologies include:

[0005] A refrigerant recovery system (patent document CN108224858A) provides a refrigerant recovery system comprising a vacuum recovery tank, a compressor, a centrifugal oil separator, an oil filter, a condenser, and a dryer filter connected sequentially by pipelines. The vacuum recovery tank is connected to an air conditioning unit via a refrigerant inlet. The centrifugal oil separator includes a first centrifugal oil separator and a second centrifugal oil separator connected in series. The dryer filter includes a first dryer filter and a second dryer filter connected in series. A humidity sight glass is installed on the pipeline after each dryer filter to achieve the refrigerant recovery process. The system has a vacuum recovery tank located before the compressor because the entire process only recovers the vapor phase. However, this recovery method is slow and inefficient. Furthermore, the system uses a semi-open method for replenishing the compressor's lubricating oil, allowing for manual replenishment through the oil replenishment port 19. However, it is difficult for on-site personnel to control the timing of manual oil replenishment. Additionally, the overall structure of this technical solution is complex, resulting in insufficient versatility.

[0006] In view of the technical defects existing in the prior art, this utility model provides a technical solution with better recycling efficiency and more refined recycling. Utility Model Content

[0007] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a refrigerant recovery and purification device.

[0008] According to the present invention, a refrigerant recovery and purification device includes: a recovery module and a gas-liquid separator; and at least one of an oil removal module and a water removal module.

[0009] The water removal module is connected to the oil removal module, the water removal module is connected to the recovery module, and the oil removal module is connected to the recovery module via pipelines.

[0010] The recovery module includes: equipment inlet, A three-way valve, condenser, B three-way valve, equipment outlet, refrigerant recovery storage tank, C three-way valve, refrigerant pump, and D three-way valve;

[0011] The recycling device is connected to the inlet of the equipment via a hose;

[0012] The equipment inlet, A three-way valve, C three-way valve, refrigerant pump, D three-way valve, B three-way valve, equipment outlet, and refrigerant recovery tank are connected by pipelines with controllable flow direction.

[0013] A one-way shut-off valve is installed on the upper part of the gas-liquid separator. One end of the one-way shut-off valve is connected to the water removal module, and the other end is connected to the gas-liquid separator. 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 a C three-way valve.

[0014] Preferably, the water removal module includes: a front sight glass, an A three-way pipe, a drying filter, a rear sight glass, and an A one-way shut-off valve;

[0015] The first outlet of the A three-way valve, the front sight glass, the first outlet of the A three-way pipe, the dryer filter, the rear sight glass, and the gas-liquid separator are connected in sequence by pipelines; the one-way shut-off valve is set between the rear sight glass and the gas-liquid separator;

[0016] After the liquid phase outlet of the gas-liquid separator is connected to the first outlet of the C three-way valve, it is sequentially connected to the refrigerant pump, the first outlet of the D three-way valve, the A one-way shut-off valve, and the second outlet of the A three-way pipe.

[0017] The second outlet of the C three-way valve is connected to the second outlet of the A three-way valve;

[0018] The second outlet of the D three-way valve is connected to the first outlet of the B three-way valve.

[0019] Preferably, the oil removal module includes: a compressor, a refrigerant-oil separator, a C-type three-way pipe, a B-type one-way shut-off valve, an oil recovery tank, and a C-type one-way shut-off valve;

[0020] The oil removal module connection pipeline starts from the compressor and connects to the refrigerant-oil separator;

[0021] 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.

[0022] The liquid phase outlet of the refrigerant-oil separator is connected to the first outlet of the C-tee pipe;

[0023] The second outlet of the C three-way pipe is connected to the B one-way shut-off valve, and then connected to the oil recovery tank;

[0024] The third outlet of the C three-way pipe is connected to the C one-way shut-off valve and then connected to the oil return hole of the compressor.

[0025] The compressor is connected to the gas-liquid separator of the dehydration module.

[0026] Preferably, the vapor phase outlet of the gas-liquid separator is connected to a one-way shut-off valve; when only the water removal module and the recovery module are included or activated, the one-way shut-off valve is closed.

[0027] Preferably, the C-type one-way shut-off valve in the oil removal module is a component consisting of a one-way shut-off valve and a capillary tube connected in parallel; the capillary tube is responsible for continuous small-flow oil return, and the one-way shut-off valve is responsible for periodic oil return.

[0028] Preferably, the recovery module receives vapor-phase refrigerant from the refrigerant-oil separator, cools it in the condenser, and then flows through the B three-way valve and the equipment outlet before entering the refrigerant recovery tank.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. This utility model introduces a one-way shut-off valve to regulate the flow direction, thereby avoiding unwanted flow and improving recovery efficiency;

[0031] 2. This utility model solves the problem of recycling investment and greatly improves the recycling speed by adopting a localized recycling model for refrigerants of different qualities;

[0032] 3. This utility model simplifies the overall setup of the device, facilitates production and installation, and reduces the total cost of the equipment.

[0033] 4. This utility model solves the problem of pollution caused by the recovery of refrigerant from the device by introducing water removal and oil removal modules into the recovery equipment. Attached Figure Description

[0034] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0035] Figure 1 This is a schematic diagram of the device of this utility model.

[0036] The diagram shows:

[0037] Detailed Implementation

[0038] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0039] like Figure 1 As shown, this embodiment of the utility model provides a refrigerant recovery and purification device, including: a recovery module; and a gas-liquid separator 8. Further, the refrigerant recovery and purification device also includes at least one of an oil removal module and a water removal module. A one-way shut-off valve 23 is installed on the upper part of the gas-liquid separator 8 to prevent unwanted refrigerant from flowing back from the gas-liquid separator 8 into the water removal module when only the oil removal module and the recovery module are operating, thus affecting the recovery efficiency.

[0040] The water removal module and the oil removal module, as well as the oil removal module and the recovery module, are all connected by pipelines.

[0041] The recovery module includes: equipment inlet 2, A three-way valve 3, condenser 11, B three-way valve 12, equipment outlet 13, refrigerant recovery storage tank 14, C three-way valve 15, refrigerant pump 16, and D three-way valve 17; the device to be recovered 1 is connected to the equipment inlet 2 via a hose; the equipment inlet 2, A three-way valve 3, C three-way valve 15, refrigerant pump 16, D three-way valve 17, B three-way valve 12, equipment outlet 13, and refrigerant recovery tank 14 are connected via a pipeline with controllable flow direction; one end of the one-way shut-off valve 23 is connected to the water removal module, and the other end is connected to the gas-liquid separator 8; the gas-liquid separator 8 has two outlets, a vapor phase and a liquid phase, and 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 C three-way valve 15;

[0042] When the refrigerant recovery and purification equipment includes only the recovery module, the refrigerant flows out of the device to be recovered 1 through the pipeline, and then flows directly from the equipment inlet 2 through the A three-way valve 3, C three-way valve 15, refrigerant pump 16, D three-way valve 17, B three-way valve 12, and equipment outlet 13, and enters the refrigerant recovery tank 14.

[0043] The water removal module includes: a front sight glass 4, a three-way pipe A 5, a dryer filter 6, a rear sight glass 7, and a one-way shut-off valve A 18.

[0044] Furthermore, the various components of the water removal module are connected sequentially via pipes. Following the refrigerant flow direction, starting from the device to be recovered (1), the refrigerant is connected to the equipment inlet (2) via a flexible hose, and 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 dryer filter (6), the rear sight glass (7), and the gas-liquid separator (8). The one-way shut-off valve (23) is located between the rear sight glass (7) and the gas-liquid separator (8) to prevent refrigerant from flowing back from the gas-liquid separator (8) to the rear sight glass (7). Gas-liquid separator 8 has two outlets: a vapor phase outlet and a liquid phase outlet. The vapor phase outlet of gas-liquid separator 8 is connected to the compressor 9 of the oil removal module. The liquid phase outlet of gas-liquid separator 8 is connected to the first outlet of C three-way valve 15, then to the refrigerant pump 16, and subsequently flows through the first outlet of D three-way valve 17 and A one-way shut-off valve 18 before connecting to the second outlet of A three-way pipe 5. The second outlet of C three-way valve 15 is connected to the second outlet of A three-way valve 3. The second outlet of D three-way valve 17 is connected to the first outlet of B three-way valve 12 of the recovery module. Furthermore, the drying filter 6 is a consumable and is removable and easily replaceable.

[0045] Furthermore, in a preferred embodiment of the refrigerant recovery and purification equipment of this utility model, the vapor phase outlet of the gas-liquid separator 8 is connected to a one-way shut-off valve; when only the dewatering module and the recovery module are included or activated, the one-way shut-off valve is closed, and both the one-way shut-off valve and the compressor 9 have an isolation function.

[0046] The oil removal module includes: compressor 9, refrigerant-oil separator 10, C three-way pipe 19, B one-way shut-off valve 20, oil recovery tank 21, C one-way shut-off valve 22;

[0047] Furthermore, the oil removal module's connecting pipeline starts from the compressor 9 and connects to the refrigerant-oil separator 10, which has two outlets: a vapor phase outlet and a liquid phase outlet. The vapor phase outlet of the refrigerant-oil separator 10 connects to the condenser 11 of the recovery module, and the liquid phase outlet of the refrigerant-oil separator 10 connects to the first outlet of the C-tee pipe 19. The second outlet of the C-tee pipe 19 connects to the B one-way shut-off valve 20 and then to the oil recovery tank 21. The third outlet of the C-tee pipe 19 connects to the C one-way shut-off valve 22 and then to the oil return port of the compressor 9. Furthermore, the C one-way shut-off valve 22 in the oil removal module can also be a component consisting of a one-way shut-off valve and a capillary tube connected in parallel; the capillary tube is responsible for continuous small-flow oil return, while the one-way shut-off valve is responsible for periodic oil return.

[0048] Furthermore, the recovery module receives vapor refrigerant from the refrigerant-oil separator 10, cools it in the condenser 11, and then flows through the B three-way valve 12 and the equipment outlet 13 before flowing into the refrigerant recovery tank 14.

[0049] Furthermore, the refrigerant recovery and purification equipment provided in this embodiment of the present invention also includes: a control system;

[0050] The control system includes: controller A, controller B, controller C, and controller D;

[0051] The controller A acquires the liquid level data in the gas-liquid separator 8 and controls the start and stop of the refrigerant pump 16 and the A one-way shut-off valve 18 to ensure that the liquid level in the gas-liquid separator 8 is not greater than the upper threshold.

[0052] The controller B acquires the liquid level data in the refrigerant-oil separator 10 and controls the start and stop of the B one-way shut-off valve 20 to ensure that the level of lubricating oil separated from the refrigerant does not exceed the upper threshold of the liquid level.

[0053] The controller C acquires the oil level data of the compressor's internal oil sump and controls the start / stop of the C one-way shut-off valve 22 to keep the compressor oil sump level within the operating range. Furthermore, when the C one-way shut-off valve 22 is a component consisting of a capillary tube and a one-way shut-off valve connected in parallel, and the capillary tube provides continuous oil return, the controller C performs phased oil return to the C one-way shut-off valve 14 based on the operating time to ensure the compressor 9 operates normally.

[0054] The controller D receives a direct recovery mode signal. If it receives this signal, the controller D controls the flow direction of three-way valves 3 (A), 12 (B), 15 (C), and 17 (D), disabling the water removal and oil removal modules. The refrigerant flows directly from the equipment inlet 2, sequentially through three-way valves 3 (A), 15 (C), 16 (refrigerant pump), 17 (D), 12 (B), and 13 (equipment outlet), entering the refrigerant recovery tank 14. If the controller D does not receive the direct recovery mode signal, it enters the purification recovery mode, where the refrigerant sequentially passes through the water removal module, oil removal module, and recovery module.

[0055] Furthermore, when the direct recovery mode signal is received, the dehydration module and the oil removal module are not activated. The refrigerant in the device to be recovered, 1, 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, and the device outlet 13, into the refrigerant recovery tank 14, completing the direct recovery. If the controller D does not receive the direct recovery mode signal, it enters the purification recovery mode. The refrigerant enters from the device inlet 2 and sequentially passes through the dehydration module (if a dehydration module exists in this embodiment), sequentially through the A three-way valve 3, the front sight glass 2, the A three-way pipe 5, the dryer filter 6, and the rear sight glass 7. According to the fluid state, the liquid phase flows out from the vapor phase outlet and the liquid phase outlet of the gas-liquid separator 8. One vapor phase outlet flows into the compressor 9 of the oil removal module, and the other liquid phase outlet flows into the C three-way valve 15, then into the refrigerant pump 16, then through the D three-way valve 17, and a portion flows through the A one-way shut-off valve 18 before returning 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 portion flowing through the D three-way valve 17 flows into the B three-way valve 12 of the recovery module to enter the recovery mode operation. The oil removal and purification starts from the compressor 9 and flows into the refrigerant-oil separator 10. After separation, the vapor phase flows from the refrigerant-oil separator. The vapor phase outlet of refrigerant-oil separator 10 flows into the condenser 11 of the recovery module, while the liquid phase flows from the liquid phase outlet of refrigerant-oil separator 10 into C three-way pipe 19. Of the other two paths of C three-way pipe 19, one flows into B one-way shut-off valve 20, returning the recovered oil to the oil recovery tank 21; the other flows into C one-way shut-off valve 22, returning the oil to the oil return hole of compressor 9 for circulation and oil removal. In the oil removal module, the capillary portion of C one-way shut-off valve 22 is responsible for continuous small-flow oil return, while the one-way shut-off valve portion is responsible for periodic oil return. When the equipment only includes the recovery module and the oil removal module, the refrigerant enters the equipment inlet 2 and flows sequentially through A three-way valve 3 and C three-way valve 15. Then it enters the gas-liquid separator 8. The vapor phase enters the compressor 9 and 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. The liquid phase flows from the liquid phase outlet of the refrigerant-oil separator 10 into the C three-way pipe 19. One of the other two paths of the C three-way pipe 19 flows into the B one-way shut-off valve 20 and returns the recovered oil to the oil recovery tank 21. The other path flows into the C one-way shut-off valve 22 and returns the oil to the oil return hole of the compressor 9 for circulation and oil removal. Among them, the capillary part of the C one-way shut-off valve 22 in the oil removal module is responsible for continuous small-flow oil return, and the one-way shut-off valve part is responsible for periodic oil return. In a more preferred embodiment, when only the oil removal module and the recovery module are working, the one-way shut-off valve 23 at the upper end of the gas-liquid separator 8 prevents undesirable refrigerant reverse flow (flow from the gas-liquid separator 8 to the rear sight glass 7); in a more preferred embodiment, the one-way shut-off valve at the vapor phase outlet of the gas-liquid separator 8 is connected to close and act as a barrier when only the water removal module and the recovery module are included or are open.

[0056] Throughout the recycling process, the control system controls the flow direction and velocity.

[0057] More specifically, the dryer filter 6 in the water removal module is a dryer filter assembly connected in parallel or in series; the refrigerant-oil separator 10 in the oil removal module is a series assembly of two or more refrigerant-oil separators.

[0058] In summary, this utility model provides a refrigerant recovery and purification device, including a recovery module, a water removal module, and an oil removal module. By introducing water removal and oil removal modules into the recovery device, the problem of contamination during refrigerant recovery 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, activating only the recovery module, and the refrigerant only needs to pass through the recovery module for recovery. In the purification recovery mode, the refrigerant passes through the water removal module, the oil removal module, and the recovery module sequentially. Through the coordinated operation of different modules under different conditions, the recovery speed is significantly improved.

[0059] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A refrigerant recovery and purification device, characterized in that, include: Recovery module, gas-liquid separator (8); oil removal module, water removal module, or at least one of the following: The water removal module and the oil removal module, as well as the oil removal module and the recovery module, are all connected by pipelines. The recycling module includes: equipment inlet (2), A three-way valve (3), condenser (11), B three-way valve (12), equipment outlet (13), refrigerant recovery storage tank (14), C three-way valve (15), refrigerant pump (16), and D three-way valve (17); The recycling device (1) is connected to the equipment inlet (2) via a hose; The equipment inlet (2), A three-way valve (3), C three-way valve (15), refrigerant pump (16), D three-way valve (17), B three-way valve (12), equipment outlet (13), and refrigerant recovery storage tank (14) are connected by pipelines with controllable flow direction. A one-way shut-off valve (23) is installed on the upper part of the gas-liquid separator (8). One end of the one-way shut-off valve (23) is connected to the water removal module, and the other end is connected to the gas-liquid separator (8). 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 a C three-way valve (15).

2. The refrigerant recovery and purification equipment according to claim 1, characterized in that, The water removal module includes: a front sight glass (4), an A three-way pipe (5), a dryer filter (6), a rear sight glass (7), and an A one-way shut-off valve (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 dryer filter (6), the rear sight glass (7) and the gas-liquid separator (8) are connected in sequence; the one-way shut-off valve (23) is located between the rear sight glass (7) and the gas-liquid separator (8); After the liquid phase outlet of the gas-liquid separator (8) is connected to the first outlet of the C three-way valve (15), it is sequentially connected to the refrigerant pump (16), the first outlet of the D three-way valve (17), the A one-way shut-off 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).

3. The refrigerant recovery and purification equipment according to claim 2, characterized in that, The oil removal module includes: a compressor (9), a refrigerant-oil separator (10), a C three-way pipe (19), a B one-way shut-off valve (20), an oil recovery tank (21), and a C one-way shut-off valve (22); The oil removal module connection pipeline starts from the compressor (9) and connects 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 shut-off 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 shut-off valve (22) and then connected to the oil return hole of the compressor (9); The compressor (9) is connected to the gas-liquid separator (8) of the water removal module.

4. The refrigerant recovery and purification equipment according to claim 3, characterized in that, The vapor phase outlet of the gas-liquid separator (8) is connected to a one-way shut-off valve; the one-way shut-off valve is closed when only the dewatering module and the recovery module are included or activated.

5. The refrigerant recovery and purification equipment according to claim 4, characterized in that, The C one-way shut-off valve (22) in the oil removal module is a component that connects the one-way shut-off valve and the capillary tube in parallel; the capillary tube is responsible for continuous small flow oil return, and the one-way shut-off valve is responsible for periodic oil return.

6. The refrigerant recovery and purification equipment according to claim 5, characterized in that, The recovery module receives vapor refrigerant from the refrigerant-oil separator (10), cools it in the condenser (11), and then flows through the B three-way valve (12) and the equipment outlet (13) before flowing into the refrigerant recovery storage tank (14).

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