CN116772465A

CN116772465A - Refrigerant recovery system and control method thereof

Info

Publication number: CN116772465A
Application number: CN202310647185.4A
Authority: CN
Inventors: 黄宇杰; 钟权; 李华杰; 吴敏庭; 史贺纯; 赵桓
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-09-19

Abstract

The invention provides a refrigerant recovery system and a control method thereof, wherein the refrigerant recovery system comprises: the air conditioner to be recovered, the liquid storage tank, the first heat exchanger, the second heat exchanger, the radiator, the refrigerant pipeline and the secondary refrigerant pipeline are arranged on the refrigerant pipeline, and the second heat exchanger and the radiator are arranged on the secondary refrigerant pipeline; the first heat exchanger is connected with or arranged close to the second heat exchanger so as to cool the refrigerant in the first heat exchanger, the secondary refrigerant subjected to heat exchange by the second heat exchanger can enter the radiator, and the radiator is arranged close to the air conditioner to be recovered so that the radiator can heat the refrigerant in the air conditioner to be recovered. According to the invention, the pressure of the refrigerant entering the liquid storage tank can be reduced, namely the pressure of a high-pressure part (exhaust gas) of the compressor can be effectively reduced; meanwhile, the temperature and the pressure of the refrigerant in the air conditioner to be recovered are improved, so that the high-low pressure ratio of the compressor is effectively reduced, and the recovery efficiency of the refrigerant is further improved.

Description

Refrigerant recovery system and control method thereof

Technical Field

The invention relates to the technical field of refrigeration, in particular to a refrigerant recovery system and a control method thereof.

Background

With the increasing trend of environmental protection, the demand for refrigerant recovery in the market is increasing. However, in the conventional refrigerant recovery system, when the refrigerant is recovered, the refrigerant recovery speed is slow and the refrigerant recovery efficiency is low due to the large high-low pressure ratio. And when the refrigerant is recovered, the pressure energy of the refrigerant cannot be recovered.

Because the refrigerant recovery machine in the prior art has the technical problems of low recovery efficiency, long recovery time, insufficient energy recovery efficiency and the like, the invention designs a refrigerant recovery system and a control method thereof.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of low recovery efficiency, long recovery time and insufficient energy recovery efficiency of the refrigerant recovery machine in the prior art, thereby providing a refrigerant recovery system and a control method thereof.

In order to solve the above-described problems, the present invention provides a refrigerant recovery system including:

the heat exchanger comprises an air conditioner to be recovered, a liquid storage tank, a first heat exchanger, a second heat exchanger, a radiator, refrigerant pipelines and a secondary refrigerant pipeline, wherein the air conditioner to be recovered, the first heat exchanger and the liquid storage tank are arranged on the refrigerant pipeline so that the refrigerant can flow into the first heat exchanger from the air conditioner to be recovered and then flow into the liquid storage tank, and the second heat exchanger and the radiator are arranged on the secondary refrigerant pipeline so that the secondary refrigerant can flow into the radiator from the second heat exchanger; the first heat exchanger is connected with or arranged close to the second heat exchanger, so that the refrigerant in the first heat exchanger can exchange heat with the refrigerant in the second heat exchanger, the refrigerant in the first heat exchanger is cooled, the refrigerant after heat exchange of the second heat exchanger can enter the radiator, and the radiator and the air conditioner to be recovered are arranged close to each other, so that the radiator can heat the refrigerant in the air conditioner to be recovered.

In some embodiments of the present invention, in some embodiments,

the semiconductor refrigerating plate is arranged between the first heat exchanger and the second heat exchanger at intervals, the cold end of the semiconductor refrigerating plate faces the first heat exchanger so as to absorb heat from the first heat exchanger, and the hot end of the semiconductor refrigerating plate faces the second heat exchanger so as to release heat towards the second heat exchanger; the first heat exchanger is also provided with a cold accumulation material inside, and the second heat exchanger is also provided with a heat accumulation material inside.

In some embodiments of the present invention, in some embodiments,

the radiator and the air conditioner to be recovered are arranged at intervals, and the radiator is positioned at the upstream of the air conditioner to be recovered along the air flowing direction, so that the air heated by the radiator flows to the air conditioner to be recovered, and the refrigerant in the air conditioner to be recovered is heated.

In some embodiments of the present invention, in some embodiments,

the air conditioner further comprises a fan, wherein the fan is arranged at intervals with the radiator, and the fan is arranged at the upstream or downstream of the radiator along the air flow direction so as to drive air to flow into the radiator to exchange heat with the refrigerating medium in the radiator.

In some embodiments of the present invention, in some embodiments,

the refrigerant pipeline comprises a first refrigerant pipeline, one end of the first refrigerant pipeline can be communicated with an outlet of the air conditioner to be recovered, the other end of the first refrigerant pipeline can be communicated with an inlet of the first heat exchanger, and a first control valve is arranged on the first refrigerant pipeline; the inlet end of the liquid storage tank is also provided with a fourth control valve;

the refrigerant pipeline comprises a refrigerant pipeline II, one end of the refrigerant pipeline II can be communicated with an outlet of the air conditioner to be recycled, the other end of the refrigerant pipeline II can be communicated with an inlet of the first heat exchanger, a compressor, a second control valve and a third control valve are arranged on the refrigerant pipeline II, the second control valve is arranged on a pipeline on one side of a refrigerant inlet of the compressor, and the third control valve is arranged on a pipeline on one side of a refrigerant outlet of the compressor.

In some embodiments of the present invention, in some embodiments,

and the second refrigerant pipeline is also provided with a first dry filter and an oil separator, the first dry filter is arranged on one side pipeline of the refrigerant inlet of the compressor, and the oil separator is arranged on one side pipeline of the refrigerant outlet of the compressor.

In some embodiments of the present invention, in some embodiments,

The heat pump air conditioner is characterized in that a third heat exchanger is further arranged on a pipeline on one side of a refrigerant inlet of the compressor, a fourth heat exchanger is further arranged on a pipeline on one side of a refrigerant outlet of the compressor, the third heat exchanger and the fourth heat exchanger are arranged close to each other at intervals, a first semiconductor thermoelectric generation sheet is arranged between the third heat exchanger and the fourth heat exchanger, and the first semiconductor thermoelectric generation sheet can generate electric energy according to the temperature difference between the third heat exchanger and the fourth heat exchanger.

In some embodiments of the present invention, in some embodiments,

the heat exchanger is characterized in that a fifth heat exchanger is further arranged on a pipeline at one side of a refrigerant inlet of the compressor, a sixth heat exchanger is further arranged on a pipeline which is arranged between the second heat exchanger and the radiator and is close to and spaced from the sixth heat exchanger, a second semiconductor thermoelectric generation sheet is arranged between the fifth heat exchanger and the sixth heat exchanger, and the second semiconductor thermoelectric generation sheet can generate electric energy according to the temperature difference between the fifth heat exchanger and the sixth heat exchanger.

In some embodiments of the present invention, in some embodiments,

the secondary refrigerant pipeline forms a circulation loop, and a water pump is further arranged on the secondary refrigerant pipeline; an expander is further arranged on a pipeline at one side of the refrigerant inlet of the compressor, a generator is further arranged in connection with the expander, and the refrigerant recovery system further comprises an electric storage device which is electrically connected with the generator; the power storage device is also electrically connected to the semiconductor refrigeration sheet.

In some embodiments of the present invention, in some embodiments,

an expander is further arranged on a pipeline at one side of the refrigerant inlet of the compressor, a generator is further arranged in connection with the expander, and the refrigerant recovery system further comprises an electric storage device which is electrically connected with the generator; the power storage device is also electrically connected with the first semiconductor thermoelectric generation sheet;

in some embodiments of the present invention, in some embodiments,

an expander is further arranged on a pipeline at one side of the refrigerant inlet of the compressor, a generator is further arranged in connection with the expander, and the refrigerant recovery system further comprises an electric storage device which is electrically connected with the generator; the power storage device is also electrically connected with the second semiconductor thermoelectric generation sheet.

In some embodiments of the present invention, in some embodiments,

the outlet end of the air conditioner to be recovered is also provided with a second drying filter, a liquid viewing device and a pressure detection device, wherein the liquid viewing device can detect and judge whether a liquid refrigerant exists in the refrigerant pipeline; along the direction of refrigerant flow, the second filter drier, look liquid device with pressure detection device all set up in the upper reaches of refrigerant pipeline one, the second filter drier, look liquid device with pressure detection device also all set up in the upper reaches of refrigerant pipeline two, the second filter drier can be accessed the vacuum pump and to refrigerant pipeline with the secondary refrigerant pipeline carries out the evacuation.

The present invention also provides a control method of the refrigerant recovery system as described above, comprising: judging whether the refrigerant in the air conditioner to be recovered is clean refrigerant or not;

a control step of opening the first control valve, closing the second control valve and closing the third control valve when judging that the refrigerant in the air conditioner to be recovered is clean refrigerant; and when judging that the refrigerant in the air conditioner to be recovered is unclean refrigerant, opening the second control valve and the third control valve, closing the first control valve, and opening the compressor.

In some embodiments of the present invention, in some embodiments,

the method further comprises a detection step of detecting a refrigerant flow state in the refrigerant pipeline through the liquid viewing device;

the judging step judges whether a liquid refrigerant exists in a refrigerant pipeline according to whether the refrigerant flows or not;

and a control step of opening the first control valve or the second control valve by opening the operation of refrigerant recovery when the liquid refrigerant exists in the refrigerant line.

In some embodiments of the present invention, in some embodiments,

when the semiconductor refrigeration piece is also included:

the control step, before the refrigerant is recovered, controls the semiconductor refrigeration piece to work, vacuumizes the refrigerant pipeline and the secondary refrigerant pipeline, and opens the first control valve, the second control valve, the third control valve and the fourth control valve at the moment, and vacuumizes; and when the pressure detection device detects that the pressure is lower than the preset pressure, closing vacuumizing and performing refrigerant recovery control action.

The refrigerant recovery system and the control method thereof provided by the invention have the following beneficial effects:

1. according to the invention, the first heat exchanger is arranged on the refrigerant pipeline and between the air conditioner to be recovered and the liquid storage tank, the second heat exchanger is arranged on the secondary refrigerant pipeline, and the first heat exchanger and the second heat exchanger can exchange heat, so that the secondary refrigerant in the second heat exchanger can be effectively utilized to cool the refrigerant in the first heat exchanger, thereby effectively reducing the temperature of the refrigerant entering the liquid storage tank, further reducing the pressure of the refrigerant entering the liquid storage tank, namely effectively reducing the pressure of a high-pressure part (exhaust) of the compressor; and simultaneously, the secondary refrigerant which is heated by the second heat exchanger in the secondary refrigerant pipeline is led into the radiator to radiate heat, and the radiated heat is used for heating the refrigerant in the air conditioner to be recovered, so that the temperature and the pressure of the refrigerant in the air conditioner to be recovered are effectively improved, the high-low pressure ratio of the compressor is effectively reduced, and the recovery efficiency of the refrigerant is further improved.

2. The invention further provides a semiconductor refrigerating sheet arranged between the first heat exchanger and the second heat exchanger, the cold end of the semiconductor refrigerating sheet can absorb heat effectively to the refrigerant in the first heat exchanger, the hot end of the semiconductor refrigerating sheet can release heat to the secondary refrigerant in the second heat exchanger, the cold end of the semiconductor refrigerating sheet can pre-cool and cool the cold storage material, and the heat storage material is preheated and heated. The saturation temperature of the recovered refrigerant is further reduced through the cold storage material, the high pressure of the recovered refrigerant is reduced, meanwhile, heat recovered from the hot end of the semiconductor refrigerating sheet is recovered through the liquid cooling system, an air conditioner to be recovered is heated through the heat exchanger, the low pressure recovery pressure is increased, the high-low pressure ratio of the compressor is further reduced, the efficiency of the compressor is improved, and the recovery efficiency is improved.

3. The invention can recycle the pressure energy of the refrigerant by using the expander, and after the refrigerant passes through the expander, the internal energy and the pressure energy are reduced, and the mechanical work is externally output to generate electricity; after the refrigerant passes through the expander, the temperature is greatly reduced, and the power generation is performed by the semiconductor thermoelectric generation sheets and the cold and hot temperature differences at the two ends of the semiconductor.

Drawings

Fig. 1 is a system configuration diagram of the refrigeration recovery system of the present invention.

The reference numerals are:

1. an air conditioner to be recovered; 2. a second dry filter; 3. an expander; 4. a fifth heat exchanger; 5. a second semiconductor thermoelectric generation sheet; 6. a sixth heat exchanger; 7. a third heat exchanger; 8. a first semiconductor thermoelectric generation sheet; 9. a fourth heat exchanger; 10. a first dry filter; 11. a compressor; 12. an oil separator; 13. a first heat exchanger; 14. a liquid storage tank; 15. a liquid viewing device; 16. a pressure detection device; 17. a second control valve; 18. a first control valve; 19. a third control valve; 20. a fourth control valve; 21. a generator; 22. a semiconductor refrigeration sheet; 23. an electric storage device; 24. a second heat exchanger; 25. a water pump; 26. a heat sink; 27. a blower; 100. a refrigerant line; 101. a first refrigerant line; 102. a second refrigerant pipeline; 200. and a coolant line.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

As shown in fig. 1, the present invention provides a refrigerant recovery system including:

an air conditioner 1 to be recovered (i.e., a system to be recovered), a liquid storage tank 14, a first heat exchanger 13, a second heat exchanger 24, and a heat sink 26, and refrigerant lines 100 and coolant lines 200, the air conditioner 1 to be recovered, the first heat exchanger 13, and the liquid storage tank 14 being disposed on the refrigerant lines 100 such that refrigerant can flow from the air conditioner 1 to be recovered into the first heat exchanger 13, and thus into the liquid storage tank 14, the second heat exchanger 24 and the heat sink 26 being disposed on the coolant lines 200 such that coolant can flow from the second heat exchanger 24 into the heat sink 26; the first heat exchanger 13 is connected with or near the second heat exchanger 24, so that the refrigerant in the first heat exchanger 13 can exchange heat with the refrigerant in the second heat exchanger 24, so as to cool the refrigerant in the first heat exchanger 13, the refrigerant after heat exchange by the second heat exchanger 24 can enter the radiator 26, and the radiator 26 is near the air conditioner 1 to be recovered, so that the radiator 26 can heat the refrigerant in the air conditioner 1 to be recovered.

According to the invention, the first heat exchanger is arranged on the refrigerant pipeline and between the air conditioner to be recovered and the liquid storage tank, the second heat exchanger is arranged on the secondary refrigerant pipeline, and the first heat exchanger and the second heat exchanger can exchange heat, so that the secondary refrigerant in the second heat exchanger can be effectively utilized to cool the refrigerant in the first heat exchanger, thereby effectively reducing the temperature of the refrigerant entering the liquid storage tank, further reducing the pressure of the refrigerant entering the liquid storage tank, namely effectively reducing the pressure of a high-pressure part (exhaust) of the compressor; and simultaneously, the secondary refrigerant in the secondary refrigerant pipeline after being heated by the second heat exchanger is led into the radiator to radiate heat, and the radiated heat is used for heating the refrigerant in the air conditioner to be recovered, so that the temperature and the pressure of the refrigerant in the air conditioner to be recovered are effectively improved, the high-low pressure ratio of the compressor is effectively reduced (the exhaust end of the compressor 11 is communicated to the liquid storage tank 14, so that the liquid storage tank is approximately equivalent to the pressure of the high-pressure end of the compressor, the suction end of the compressor is communicated to the air conditioner to be recovered, so that the position of the air conditioner to be recovered is approximately equivalent to the pressure of the low-pressure end of the compressor), and the pressure of the position of the liquid storage tank is reduced due to the improvement of the pressure of the position of the air conditioner to be recovered, so that the refrigerant can flow from the air conditioner to be recovered to the liquid storage tank more favorably, and the recovery efficiency of the refrigerant is effectively improved.

In some embodiments of the present invention, in some embodiments,

the first heat exchanger 13 and the second heat exchanger 24 are arranged at intervals, the semiconductor refrigerating plate 22 is further arranged between the first heat exchanger 13 and the second heat exchanger 24, the cold end of the semiconductor refrigerating plate 22 faces the first heat exchanger 13 to absorb heat from the first heat exchanger 13, and the hot end of the semiconductor refrigerating plate 22 faces the second heat exchanger 24 to release heat towards the second heat exchanger 24; the first heat exchanger 13 is also provided with a cold storage material inside, and the second heat exchanger 24 is also provided with a heat storage material inside.

The invention further provides a semiconductor refrigerating sheet arranged between the first heat exchanger and the second heat exchanger, the cold end of the semiconductor refrigerating sheet can absorb heat effectively to the refrigerant in the first heat exchanger, the hot end of the semiconductor refrigerating sheet can release heat to the secondary refrigerant in the second heat exchanger, the cold end of the semiconductor refrigerating sheet can pre-cool and cool the cold storage material, and the heat storage material is preheated and heated. The saturation temperature of the recovered refrigerant is further reduced through the cold storage material, the high pressure of the recovered refrigerant is reduced, namely, the refrigerant pressure at the liquid storage tank is further effectively reduced, meanwhile, heat recovered from the hot end of the semiconductor refrigerating sheet is recovered through the liquid cooling system, the air conditioner to be recovered is heated through the heat exchanger, the low pressure recovery pressure is increased, namely, the refrigerant pressure at the air conditioner to be recovered is further effectively improved, the refrigerant can be further promoted to flow from the air conditioner to be recovered to the liquid storage tank, namely, the high-low pressure ratio of the compressor is further reduced, the efficiency of the compressor is further improved, and the recovery efficiency is further improved.

The invention provides a refrigerant recovery system, which is provided with a semiconductor cooling device, a cold storage material, a heat storage material, an expander for power generation and a semiconductor thermoelectric power generation, so that the high-low pressure ratio during refrigerant recovery can be reduced, the refrigerant recovery efficiency can be improved, the recovery time can be shortened, and the energy recovery efficiency can be improved.

The gaseous refrigerant passes through the first dry filter 10, the compressor 11, the oil separator 12, the condenser (first heat exchanger 13), and then enters the liquid storage tank 14. At the time of refrigerant recovery, since the liquid refrigerant remaining in the air conditioner 1 to be recovered is continuously gasified, its temperature is continuously lowered (normally, lower than 0 ℃), the low-temperature gaseous refrigerant is low in pressure and low in density, and the liquid refrigerant in the receiver tank 14 is high-pressure liquid refrigerant at a high temperature (the temperature of the conventional system is higher than the ambient temperature), so that the high-low pressure ratio of the compressor is large. The high-low pressure ratio greatly reduces the compression efficiency of the compressor, and the low-density low-temperature gaseous refrigerant reduces the recovery speed (reduces the mass flow rate) of the compressor.

Therefore, in the refrigerant recovery system of the invention, the cold storage material is preferably precooled and cooled through the cold end of the semiconductor refrigerating sheet before refrigerant recovery, and the heat storage material is preferably preheated and heated. The saturation temperature of the recovered refrigerant is further reduced through the cold storage material, the high pressure of the recovered refrigerant is reduced, meanwhile, heat recovered from the hot end of the semiconductor refrigerating sheet is recovered through the liquid cooling system, an air conditioner to be recovered is heated through the heat exchanger, the low pressure recovery pressure is increased, the high-low pressure ratio of the compressor is further reduced, the efficiency of the compressor is improved, and the recovery efficiency is improved.

In some embodiments of the present invention, in some embodiments,

the radiator 26 is arranged at intervals with the air conditioner 1 to be recovered, and the radiator 26 is positioned at the upstream of the air conditioner 1 to be recovered along the air flowing direction, so that the air heated by the radiator 26 flows to the air conditioner 1 to be recovered, and the refrigerant in the air conditioner 1 to be recovered is heated.

The radiator is an air-cooled radiator, and is arranged at the upstream of the air flow direction of the air conditioner to be recovered, so that the radiator firstly heats the air flowing through the radiator, then the heated air flows through the air conditioner to be recovered, and the refrigerant in the air conditioner to be recovered is further effectively heated, thereby realizing the effect of increasing the temperature (pressure) of the refrigerant at the air conditioner to be recovered, namely improving the pressure of the low-pressure end of the compressor, and being beneficial to the recovery of the refrigerant.

In some embodiments of the present invention, in some embodiments,

the air conditioner further comprises a fan 27, wherein the fan 27 is arranged at intervals with the radiator 26, and the fan 27 is arranged at the upstream or downstream of the radiator 26 along the air flow direction so as to drive air to flow into the radiator 26 to exchange heat with the refrigerating medium in the radiator 26. This is a further preferred form of construction of the invention, whereby the fan structure is arranged to effectively drive the air flow through the radiator and to exchange heat with the refrigerant in the radiator.

In some embodiments of the present invention, in some embodiments,

the refrigerant pipeline 100 comprises a first refrigerant pipeline 101, one end of the first refrigerant pipeline 101 can be communicated with the outlet of the air conditioner 1 to be recovered, the other end of the first refrigerant pipeline 101 can be communicated with the inlet of the first heat exchanger 13, and the first refrigerant pipeline 101 is provided with a first control valve 18; the inlet end of the liquid storage tank 14 is also provided with a fourth control valve 20;

the refrigerant pipeline 100 comprises a refrigerant pipeline two 102, one end of the refrigerant pipeline two 102 can be communicated with the outlet of the air conditioner 1 to be recycled, the other end of the refrigerant pipeline two 102 can be communicated with the inlet of the first heat exchanger 13, the refrigerant pipeline two 102 is provided with a compressor 11, a second control valve 17 and a third control valve 19, the second control valve 17 is arranged on the pipeline on one side of the refrigerant inlet of the compressor 11, and the third control valve 19 is arranged on the pipeline on one side of the refrigerant outlet of the compressor 11.

The refrigerant pipeline is a preferred structural form of the invention, and by arranging the refrigerant pipeline I and the refrigerant pipeline II, the corresponding pipelines can be opened in two different conditions, the invention preferably judges whether the refrigerant in the air conditioner to be recovered is clean or not, if the refrigerant is judged to be clean, the refrigerant can be directly led to the first heat exchanger through the refrigerant pipeline I, the first control valve 18 on the refrigerant pipeline I is opened, and the second control valve 17 and the third control valve 19 on the refrigerant pipeline II are closed; however, if it is determined that the refrigerant is not clean, it is indicated that the refrigerant contains certain impurities (including solid impurities, etc.), then the refrigerant pipeline two needs to be opened, the refrigerant is effectively filtered and cleaned by the first dry filter 10, then a certain power is provided for the refrigerant by the compressor (because the flow resistance of the refrigerant containing the impurities is large, the refrigerant can be effectively driven to flow to the liquid storage tank by providing input work through the compressor), and the refrigerant before entering the compressor can be effectively filtered by the first dry filter arranged on the refrigerant inlet side pipeline of the compressor, so that the unsafe hidden trouble caused by entering the compressor is prevented; therefore, the invention adopts two different refrigerant pipelines to convey the refrigerant in consideration of the factors of cleanliness or uncleanness, can effectively ensure that the condition that the refrigerant cannot be effectively conveyed into the liquid storage tank due to large flow resistance under the condition of containing impurities is avoided, further improves the recovery rate of the refrigerant, and effectively prevents the faults of shutdown and the like caused by the suction of the impurities in the compressor.

In some embodiments of the present invention, in some embodiments,

the second refrigerant pipe 102 is further provided with a first filter drier 10 and an oil separator 12, the first filter drier 10 is disposed on a pipe line on a side of a refrigerant inlet of the compressor 11, and the oil separator 12 is disposed on a pipe line on a side of a refrigerant outlet of the compressor 11.

According to the invention, the first dry filter arranged on the second refrigerant pipeline can filter and remove impurities from the refrigerant entering the second refrigerant pipeline, the refrigerant after the impurities are removed enters the compressor for compression, normal operation of the compressor can be ensured, the oil separator arranged on the outlet pipeline of the compressor can perform oil separation on the refrigerant at the outlet of the compressor, the condition that the compressor cannot be effectively lubricated and cooled due to the fact that the oil flows out of the compressor is prevented, the first dry filter and the compressor arranged on the second refrigerant pipeline can filter the refrigerant containing impurities, conveying power is provided, the condition that the refrigerant cannot be effectively conveyed into the liquid storage tank due to large flowing resistance is avoided, and the recovery rate of the refrigerant is further improved.

In some embodiments of the present invention, in some embodiments,

The heat pump is characterized in that a third heat exchanger 7 is further arranged on a pipeline on one side of a refrigerant inlet of the compressor 11, a fourth heat exchanger 9 is further arranged on a pipeline on one side of a refrigerant outlet of the compressor 11, the third heat exchanger 7 and the fourth heat exchanger 9 are arranged close to each other and at intervals, a first semiconductor thermoelectric generation sheet 8 is arranged between the third heat exchanger 7 and the fourth heat exchanger 9, and the first semiconductor thermoelectric generation sheet 8 can generate electric energy according to the temperature difference between the third heat exchanger 7 and the fourth heat exchanger 9.

The invention also arranges the third heat exchanger on the pipeline at one side of the refrigerant inlet of the compressor, and arranges the fourth heat exchanger on the pipeline at the refrigerant outlet of the compressor, because the refrigerant at the inlet and the refrigerant at the outlet of the compressor have larger temperature difference, the third heat exchanger and the fourth heat exchanger are arranged close to each other at intervals, and the first semiconductor thermoelectric generation sheet is arranged between the third heat exchanger and the fourth heat exchanger, so that the temperature difference between the third heat exchanger and the fourth heat exchanger can be effectively utilized for generating electricity, and the temperature difference energy of the refrigerant can be effectively recovered for generating electricity.

In some embodiments of the present invention, in some embodiments,

the fifth heat exchanger 4 is further disposed on a pipeline at one side of the refrigerant inlet of the compressor 11, the sixth heat exchanger 6 is further disposed on a pipeline between the second heat exchanger 24 and the heat sink 26 on the refrigerant pipeline, the fifth heat exchanger 4 and the sixth heat exchanger 6 are disposed close to each other and at intervals, a second semiconductor thermoelectric generation sheet 5 is disposed between the fifth heat exchanger 4 and the sixth heat exchanger 6, and the second semiconductor thermoelectric generation sheet 5 can generate electric energy according to a temperature difference between the fifth heat exchanger 4 and the sixth heat exchanger 6.

The invention also arranges a fifth heat exchanger on a pipeline at one side of the refrigerant inlet of the compressor and a sixth heat exchanger on the refrigerant pipeline and positioned at the outlet end of the second heat exchanger, and because a larger temperature difference exists between the temperature of the refrigerant at the inlet end of the compressor and the refrigerant heated by the second heat exchanger, the fifth heat exchanger and the sixth heat exchanger are arranged close to each other, and a second semiconductor temperature difference generating sheet is arranged between the fifth heat exchanger and the sixth heat exchanger, so that the temperature difference between the fifth heat exchanger and the sixth heat exchanger can be effectively utilized for generating electricity, and the temperature difference energy between the refrigerant and the refrigerant can be effectively recovered for generating electricity.

In some embodiments of the present invention, in some embodiments,

the secondary refrigerant pipeline forms a circulation loop, and a water pump 25 is further arranged on the secondary refrigerant pipeline 200; an expander 3 is further disposed on a pipe line at one side of the refrigerant inlet of the compressor 11, a generator 21 is further disposed in connection with the expander 3, the refrigerant recovery system further includes a power storage device 23 (preferably a storage battery), and the power storage device 23 is electrically connected to the generator 21; the power storage device 23 is also electrically connected to the semiconductor refrigeration sheet 22.

The invention is a further preferable structural form, the expansion machine arranged on the refrigerant inlet pipeline of the compressor can expand and decompress the refrigerant of the air conditioner to be recovered, form low pressure and guide the low pressure into the low pressure suction end of the compressor, and effectively drive the generator to move by the work generated by the expansion of the expansion machine, thereby effectively generating electric energy, and part of the electric energy can be stored by the electric storage device for standby electricity, thus improving the energy utilization efficiency of the refrigerating system; and the power storage device is also electrically connected with the semiconductor refrigerating sheet, so that the electric energy generated by the semiconductor refrigerating sheet due to temperature difference can be absorbed, and the energy utilization efficiency of the refrigerating system is further improved.

In some embodiments of the present invention, in some embodiments,

an expander 3 is further arranged on a pipeline at one side of the refrigerant inlet of the compressor 11, a generator 21 is further arranged in connection with the expander 3, the refrigerant recovery system further comprises an electric storage device 23, and the electric storage device 23 is electrically connected with the generator 21; the power storage device 23 is also electrically connected to the first semiconductor thermoelectric generation sheet 8.

The invention is a further preferable structural form, the expansion machine arranged on the refrigerant inlet pipeline of the compressor can expand and decompress the refrigerant of the air conditioner to be recovered, form low pressure and guide the low pressure into the low pressure suction end of the compressor, and effectively drive the generator to move by the work generated by the expansion of the expansion machine, thereby effectively generating electric energy, and part of the electric energy can be stored by the electric storage device for standby electricity, thus improving the energy utilization efficiency of the refrigerating system; and the power storage device is electrically connected with the first semiconductor thermoelectric generation sheet, so that the electric energy generated by the first semiconductor thermoelectric generation sheet due to temperature difference can be absorbed, and the energy utilization efficiency of the refrigerating system is further improved.

In some embodiments of the present invention, in some embodiments,

An expander 3 is further arranged on a pipeline at one side of the refrigerant inlet of the compressor 11, a generator 21 is further arranged in connection with the expander 3, the refrigerant recovery system further comprises an electric storage device 23, and the electric storage device 23 is electrically connected with the generator 21; the power storage device 23 is also electrically connected to the second semiconductor thermoelectric generation sheet 5.

The invention is a further preferable structural form, the expansion machine arranged on the refrigerant inlet pipeline of the compressor can expand and decompress the refrigerant of the air conditioner to be recovered, form low pressure and guide the low pressure into the low pressure suction end of the compressor, and effectively drive the generator to move by the work generated by the expansion of the expansion machine, thereby effectively generating electric energy, and part of the electric energy can be stored by the electric storage device for standby electricity, thus improving the energy utilization efficiency of the refrigerating system; and the power storage device is electrically connected with the second semiconductor thermoelectric generation sheet, so that the electric energy generated by the second semiconductor thermoelectric generation sheet due to the temperature difference can be absorbed, and the energy utilization efficiency of the refrigerating system is further improved.

In some embodiments of the present invention, in some embodiments,

the outlet end of the air conditioner 1 to be recovered is also provided with a second drying filter 2, a liquid viewing device 15 and a pressure detection device 16, wherein the liquid viewing device 15 can detect and judge whether a liquid refrigerant exists in a refrigerant pipeline; along the direction of the refrigerant flow, the second filter drier 2, the liquid viewing device 15 and the pressure detection device 16 are all disposed upstream of the first refrigerant pipeline 101, the second filter drier 2, the liquid viewing device 15 and the pressure detection device 16 are also all disposed upstream of the second refrigerant pipeline 102, and the second filter drier 2 can be connected to a vacuum pump to vacuumize the refrigerant pipeline 100 and the coolant pipeline 200.

The second drying filter can be connected to the vacuum pump to vacuumize the refrigerant pipeline and the secondary refrigerant pipeline, so that the control and operation of recycling the refrigerant can be performed after vacuumization.

The refrigerant recovery system of the present invention includes a second dry filter 2, an expander 3, a fifth heat exchanger 4 (preferably a heat exchange plate), a third heat exchanger 7 (preferably a heat exchange plate), a first dry filter 10, a compressor 11, an oil separator 12, a fourth heat exchanger 9 (preferably a heat exchange plate), a first heat exchanger 13 filled with a cold storage material inside, a liquid storage tank 14, a liquid viewing device 15 (preferably a liquid viewing mirror), a pressure detection device 16 (preferably a pressure gauge), a second control valve 17 (preferably a stop valve), a first control valve 18 (preferably a stop valve), a third control valve 19 (preferably a stop valve), and a fourth control valve 20 (preferably a stop valve).

The refrigerant suction pipe is connected with the air conditioner 1 to be recovered, firstly passes through the second drying filter 2, enters the liquid-viewing mirror, and exits from the liquid-viewing mirror in two paths, one path passes through the second control valve 17, enters the expander 3, exits into the fifth heat exchanger 4, then passes through the third heat exchanger 7, then enters the compressor 11 through the first drying filter 10 to be compressed, and then enters the oil separator 12 to be cooled, and then enters the fourth heat exchanger 9; the refrigerant coming out of the fourth heat exchanger 9 enters the first heat exchanger 13 filled with cold storage materials through the third control valve 19, and finally enters the liquid storage tank 14 through the fourth control valve 20; one path of the cold accumulation material passes through a first control valve 18, is connected with a first heat exchanger 13 filled with the cold accumulation material, and finally enters the liquid storage tank 14 through a fourth control valve 20.

The liquid cooling subsystem consists of a water pump 25, a radiator 26, a fan 27, a second heat exchanger 24 filled with heat storage materials and a sixth heat exchanger 6.

The power generation and energy storage system consists of a generator 21, a second semiconductor thermoelectric generation sheet 5, a first semiconductor thermoelectric generation sheet 8, an electric storage device 23 and a semiconductor refrigeration sheet 22.

The present invention also provides a control method of the refrigerant recovery system as described above, comprising:

Judging whether the refrigerant in the air conditioner 1 to be recovered is clean refrigerant or not;

a control step of opening the first control valve 18 and closing the second control valve 17 and closing the third control valve 19 when it is judged that the refrigerant in the air conditioner 1 to be recovered is clean refrigerant; when it is judged that the refrigerant in the air conditioner 1 to be recovered is an unclean refrigerant, the second control valve 17 and the third control valve 19 are opened and the first control valve 18 is closed, and the compressor 11 is opened.

The invention opens corresponding pipelines by judging whether the refrigerant in the air conditioner to be recovered is clean or not, so that the two different conditions are separated, the invention preferably judges whether the refrigerant in the air conditioner to be recovered is clean or not, if the refrigerant is judged to be clean, the refrigerant can be directly led to the first heat exchanger through the first refrigerant pipeline, the first control valve 18 on the first refrigerant pipeline is opened, and the second control valve 17 and the third control valve 19 on the second refrigerant pipeline are closed at the same time; however, if it is determined that the refrigerant is not clean, it is indicated that the refrigerant contains certain impurities (including solid impurities, etc.), then the refrigerant pipeline two needs to be opened, the refrigerant is effectively filtered and cleaned by the first dry filter 10, then a certain power is provided for the refrigerant by the compressor (because the flow resistance of the refrigerant containing the impurities is large, the refrigerant can be effectively driven to flow to the liquid storage tank by providing input work through the compressor), and the refrigerant before entering the compressor can be effectively filtered by the first dry filter arranged on the refrigerant inlet side pipeline of the compressor, so that the unsafe hidden trouble caused by entering the compressor is prevented; therefore, the invention adopts two different refrigerant pipelines to convey the refrigerant in consideration of the factors of cleanliness or uncleanness, can effectively ensure that the condition that the refrigerant cannot be effectively conveyed into the liquid storage tank due to large flow resistance under the condition of containing impurities is avoided, further improves the recovery rate of the refrigerant, and effectively prevents the faults of shutdown and the like caused by the suction of the impurities in the compressor.

If the refrigerant of the air conditioner 1 to be recovered is known to be a clean refrigerant, step (1) may be used, otherwise step (2) is directly performed. (in this case, the compressor 11 does not compress, but serves as a passage), the tank 14 is initially evacuated, and the pressure of the tank 14 gradually increases during the recovery process, so that a high pressure is formed.

When the refrigerant starts to be recovered, the liquid mirror is observed, and when the refrigerant is found to be in a liquid state, the second control valve 17 and the third control valve 19 are closed, the first control valve 18 and the fourth control valve 20 are opened, and the semiconductor refrigeration sheet 22 continuously operates. At this time, the liquid storage tank is in a negative pressure state, the temperature of the first heat exchanger 13 filled with the cold storage material is lower than the ambient temperature due to the existence of the pressure difference, the temperature of the refrigerant in the air conditioner 1 to be recovered is close to the ambient temperature, the refrigerant sequentially passes through the drying filter, the liquid viewing mirror and the first control valve 18 and flows into the first heat exchanger 13, and after the cooled cold storage material is cooled, the refrigerant flows into the liquid storage tank 14 through the fourth control valve 20; simultaneously, the water pump 25 and the fan 27 are turned on, so that the cooling liquid (i.e., the secondary refrigerant) circulates in the liquid cooling system (i.e., the cold-carrying system) (the cooling liquid may be water). The cooling liquid takes away the heat of the heat storage material preheated by the second heat exchanger 24, and enters the sixth heat exchanger 6 for heating. Since the temperature of the fifth heat exchanger 4 is close to the normal temperature, and the temperature of the sixth heat exchanger 6 is higher than the normal temperature after heating, the second semiconductor thermoelectric generation sheet 5 generates electric energy to charge the electric storage device 23 under the temperature difference. The cooling liquid enters the radiator 26, and under the fan 27, heat is radiated through the radiator 26, the radiated heat heats the air conditioner 1 to be recovered, the pressure in the air conditioner is increased, and the refrigerant is promoted to flow to the liquid storage tank 14 further. When no further flow of refrigerant in the liquid mirror is observed, the first control valve 18 and the fourth control valve 20 are closed.

(2) The second control valve 17, the third control valve 19 and the fourth control valve 20 are opened, the first control valve 18 is closed, the compressor 11, the semiconductor refrigerating sheet 22, the water pump 25 and the fan 27 are simultaneously opened, the cooling liquid heats the sixth heat exchanger 6, and the heat emitted by the radiator 26 continuously heats the air conditioner 1 to be recovered. The refrigerant comes out of the air conditioner 1 to be recovered, sequentially passes through the second dry filter 2, the liquid-viewing mirror and the second control valve 17, and then enters the expander 3. After the refrigerant passes through the expander 3, the internal energy and the pressure energy are reduced, the expander 3 outputs mechanical work to the outside, the generator 21 is driven to generate electricity, and the generated electricity charges the electric storage device 23 and is stored. After passing through the expander 3, the temperature of the refrigerant is greatly reduced, the refrigerant enters the fifth heat exchanger 4, and the temperature difference between the cold and the hot occurs at the two ends of the semiconductor through the second semiconductor temperature difference power generation sheet 5, so that electric energy is generated to charge the electric storage device 23 and the electric storage device is stored. The refrigerant with lower temperature from the fifth heat exchanger 4 enters the third heat exchanger 7 and generates a temperature difference with the fourth heat exchanger 9, and the temperature difference between the cold temperature and the hot temperature occurs at the two ends of the semiconductor through the first semiconductor thermoelectric generation sheet 8, so that electric energy is generated to charge the electric power storage device 23 and is stored. The refrigerant coming out of the third heat exchanger 7 is sucked into the compressor 11 through the first drier-filter 10. The high-temperature and high-pressure refrigerant from the compressor 11 enters the fourth heat exchanger 9 through the oil separator 12 to release heat and cool, then flows to the first heat exchanger 13 through the third control valve 19, is cooled by the cold storage material precooled in the first heat exchanger 13, and then flows into the liquid storage tank 14 through the fourth control valve 20.

(3) When no liquid flow in the liquid viewing mirror is observed, and the absolute pressure of the pressure gauge is lower than 1bar (the absolute pressure is considered that the refrigerant in the air conditioner 1 to be recovered is basically recovered), the fourth control valve 20, the second control valve 17 and the first control valve 18 are closed, the compressor 11 is closed, the operation of the semiconductor refrigerating sheet 22 is stopped, the water pump 25 is stopped, and the operation of the fan 27 is stopped. The invention firstly closes the fourth control valve 20, the second control valve 17 and the first control valve 18, and then closes the compressor 11, which can prevent the refrigerant in the liquid storage tank 14 from flowing back and prevent the ambient air from entering the polluted refrigerant recovery machine; the semiconductor cooling fin 22 is stopped first, and then the water pump and the blower fan are stopped in order to prevent overheating of the semiconductor cooling fin 22.

In some embodiments of the present invention, in some embodiments,

further comprising a detecting step of detecting a refrigerant flow state in the refrigerant line by the liquid-viewing device 15;

and a control step of opening the first control valve 18 or the second control valve 17 when a liquid refrigerant exists in the refrigerant line, and opening the refrigerant recovery operation.

The control step of the invention further detects and judges whether the liquid refrigerant exists, thereby effectively judging whether the vacuumizing process is effectively finished, and the refrigerant pipeline and the secondary refrigerant pipeline become negative pressure after vacuumizing, so that the refrigerant can correspondingly become liquid, the operation of refrigerant recovery is executed, and the recovery rate of the refrigerant can be improved.

In some embodiments of the present invention, in some embodiments,

when the semiconductor refrigeration sheet 22 is further included:

the control step, before the refrigerant is recovered, controlling the semiconductor refrigeration piece 22 to work and vacuuming the refrigerant pipeline and the secondary refrigerant pipeline, and opening the first control valve 18, the second control valve 17, the third control valve 19 and the fourth control valve 20 at this time and vacuuming; when the pressure detecting device 16 detects that the pressure is lower than the preset pressure, the vacuum pumping is turned off, and the refrigerant recovery control operation is performed.

The invention further starts the semiconductor refrigerating sheet to work before the refrigerant is recovered, so that the cold storage material can be precooled and cooled through the cold end of the semiconductor refrigerating sheet, and the heat storage material can be preheated and heated. The saturation temperature of the recovered refrigerant is further reduced through the cold storage material, the high pressure of the recovered refrigerant is reduced, meanwhile, heat recovered from the hot end of the semiconductor refrigerating sheet is recovered through the liquid cooling system, an air conditioner to be recovered is heated through the heat exchanger, the low pressure recovery pressure is increased, the high-low pressure ratio of the compressor is further reduced, the efficiency of the compressor is improved, and the recovery efficiency is improved; the invention also performs vacuumizing operation on the refrigerant pipeline and the secondary refrigerant pipeline before refrigerant recovery, so that the refrigerant pipeline and the secondary refrigerant pipeline can be vacuumized, and the refrigerant pipeline and the secondary refrigerant pipeline become negative pressure after vacuumizing, so that the refrigerant can correspondingly become liquid, the refrigerant recovery operation is performed, and the recovery rate of the refrigerant can be further improved.

As shown in fig. 1, one specific mode of operation of the refrigerant recovery system of the present invention is as follows,

by manually observing the liquid mirror, it is possible to determine the state of flow of the refrigerant in the tube (whether or not the liquid refrigerant is present or whether or not the liquid refrigerant in the tube is flowing).

The vacuum operation is performed on the liquid storage tank 14 and the refrigerant system before the refrigerant is recovered. When the vacuum is pumped, the second control valve 17, the first control valve 18, the third control valve 19 and the fourth control valve 20 are opened, the vacuum pump is connected to the front of the second dry filter 2, the pressure gauge is observed, and when the absolute pressure is lower than 40Pa, the vacuum pumping is stopped.

Before the recovery system recovers the refrigerant, the semiconductor refrigeration piece 22 is operated in advance (when an external power supply is connected, the semiconductor refrigeration piece 22 is powered by the external power supply, and when the external power supply is not connected, the semiconductor refrigeration piece 22 is powered by the power storage device 23), the cold end of the semiconductor refrigeration piece cools the first heat exchanger 13 filled with the cold storage material (the internal cold storage material can be water), and the hot end of the semiconductor refrigeration piece heats the second heat exchanger 24 filled with the heat storage material (the internal cold storage material can be paraffin).

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. A refrigerant recovery system, characterized by: comprising the following steps:

an air conditioner (1) to be recovered, a liquid storage tank (14), a first heat exchanger (13), a second heat exchanger (24) and a radiator (26), and a refrigerant line (100) and a secondary refrigerant line (200), wherein the air conditioner (1) to be recovered, the first heat exchanger (13) and the liquid storage tank (14) are arranged on the refrigerant line (100) so that the refrigerant can flow from the air conditioner (1) to be recovered into the first heat exchanger (13) and then into the liquid storage tank (14), and the second heat exchanger (24) and the radiator (26) are arranged on the secondary refrigerant line (200) so that the secondary refrigerant can flow from the second heat exchanger (24) into the radiator (26); the first heat exchanger (13) is connected with or arranged close to the second heat exchanger (24), so that the refrigerant in the first heat exchanger (13) can exchange heat with the refrigerant in the second heat exchanger (24), the refrigerant in the first heat exchanger (13) is cooled, the refrigerant subjected to heat exchange by the second heat exchanger (24) can enter the radiator (26), and the radiator (26) is arranged close to the air conditioner (1) to be recovered, so that the radiator (26) can heat the refrigerant in the air conditioner (1) to be recovered.

2. The refrigerant recovery system according to claim 1, wherein:

the first heat exchanger (13) and the second heat exchanger (24) are arranged at intervals, a semiconductor refrigerating sheet (22) is further arranged between the first heat exchanger (13) and the second heat exchanger (24), the cold end of the semiconductor refrigerating sheet (22) faces the first heat exchanger (13) so as to absorb heat from the first heat exchanger (13), and the hot end of the semiconductor refrigerating sheet (22) faces the second heat exchanger (24) so as to release heat towards the second heat exchanger (24); the first heat exchanger (13) is also provided with a cold storage material inside, and the second heat exchanger (24) is also provided with a heat storage material inside.

3. The refrigerant recovery system according to claim 1, wherein:

the radiator (26) is arranged at intervals with the air conditioner (1) to be recovered, and the radiator (26) is positioned at the upstream of the air conditioner (1) to be recovered along the air flow direction, so that the air heated by the radiator (26) flows to the air conditioner (1) to be recovered, and the refrigerant in the air conditioner (1) to be recovered is heated.

4. A refrigerant recovery system according to claim 3, wherein:

The air conditioner further comprises a fan (27), wherein the fan (27) is arranged at intervals with the radiator (26), and the fan (27) is arranged at the upstream or downstream of the radiator (26) along the air flow direction so as to drive air to flow into the radiator (26) to exchange heat with the refrigerating medium in the radiator (26).

5. The refrigerant recovery system according to any one of claims 1 to 4, wherein:

the refrigerant pipeline (100) comprises a first refrigerant pipeline (101), one end of the first refrigerant pipeline (101) can be communicated with an outlet of the air conditioner (1) to be recovered, the other end of the first refrigerant pipeline can be communicated with an inlet of the first heat exchanger (13), and a first control valve (18) is arranged on the first refrigerant pipeline (101); the inlet end of the liquid storage tank (14) is also provided with a fourth control valve (20);

the refrigerant pipeline (100) comprises a refrigerant pipeline two (102), one end of the refrigerant pipeline two (102) can be communicated with the outlet of the air conditioner (1) to be recycled, the other end of the refrigerant pipeline two (102) can be communicated with the inlet of the first heat exchanger (13), a compressor (11), a second control valve (17) and a third control valve (19) are arranged on the refrigerant pipeline two (102), the second control valve (17) is arranged on one side pipeline of the refrigerant inlet of the compressor (11), and the third control valve (19) is arranged on one side pipeline of the refrigerant outlet of the compressor (11).

6. The refrigerant recovery system according to claim 5, wherein:

the second refrigerant pipeline (102) is further provided with a first dry filter (10) and an oil separator (12), the first dry filter (10) is arranged on one side pipeline of the refrigerant inlet of the compressor (11), and the oil separator (12) is arranged on one side pipeline of the refrigerant outlet of the compressor (11).

7. The refrigerant recovery system according to claim 5, wherein:

the heat exchanger is characterized in that a third heat exchanger (7) is further arranged on a pipeline on one side of a refrigerant inlet of the compressor (11), a fourth heat exchanger (9) is further arranged on a pipeline on one side of a refrigerant outlet of the compressor (11), the third heat exchanger (7) is close to the fourth heat exchanger (9) and is arranged at intervals, a first semiconductor thermoelectric generation sheet (8) is arranged between the third heat exchanger (7) and the fourth heat exchanger (9), and the first semiconductor thermoelectric generation sheet (8) can generate electric energy according to the temperature difference between the third heat exchanger (7) and the fourth heat exchanger (9).

8. The refrigerant recovery system according to claim 5, wherein:

a fifth heat exchanger (4) is further arranged on a pipeline at one side of a refrigerant inlet of the compressor (11), a sixth heat exchanger (6) is further arranged on a pipeline between the second heat exchanger (24) and the radiator (26), the fifth heat exchanger (4) and the sixth heat exchanger (6) are arranged close to each other at intervals, a second semiconductor thermoelectric generation sheet (5) is arranged between the fifth heat exchanger (4) and the sixth heat exchanger (6), and the second semiconductor thermoelectric generation sheet (5) can generate electric energy according to the temperature difference between the fifth heat exchanger (4) and the sixth heat exchanger (6).

9. The refrigerant recovery system according to claim 5, wherein:

the secondary refrigerant pipeline forms a circulation loop, and a water pump (25) is further arranged on the secondary refrigerant pipeline (200); when a semiconductor refrigerating sheet (22) is further arranged between the first heat exchanger (13) and the second heat exchanger (24), an expander (3) is further arranged on a pipeline at one side of a refrigerant inlet of the compressor (11), a generator (21) is further arranged in connection with the expander (3), and the refrigerant recovery system further comprises an electric storage device (23), wherein the electric storage device (23) is electrically connected with the generator (21); the power storage device (23) is also electrically connected to the semiconductor refrigeration sheet (22).

10. The refrigerant recovery system according to claim 7, wherein:

an expander (3) is further arranged on a pipeline at one side of a refrigerant inlet of the compressor (11), a generator (21) is further arranged in connection with the expander (3), the refrigerant recovery system further comprises an electric storage device (23), and the electric storage device (23) is electrically connected with the generator (21); the power storage device (23) is also electrically connected to the first semiconductor thermoelectric generation sheet (8).

11. The refrigerant recovery system according to claim 8, wherein:

An expander (3) is further arranged on a pipeline at one side of a refrigerant inlet of the compressor (11), a generator (21) is further arranged in connection with the expander (3), the refrigerant recovery system further comprises an electric storage device (23), and the electric storage device (23) is electrically connected with the generator (21); the power storage device (23) is also electrically connected with the second semiconductor thermoelectric generation sheet (5).

12. The refrigerant recovery system according to any one of claims 5 to 11, wherein:

the outlet end of the air conditioner (1) to be recovered is also provided with a second drying filter (2), a liquid viewing device (15) and a pressure detection device (16), wherein the liquid viewing device (15) can detect and judge whether liquid refrigerant exists in a refrigerant pipeline or not; along the direction of refrigerant flow, second filter drier (2) look liquid device (15) with pressure detection device (16) all set up in refrigerant pipeline one (101)'s the upper reaches, second filter drier (2) look liquid device (15) with pressure detection device (16) also all set up in refrigerant pipeline two (102)'s the upper reaches, second filter drier (2) can be connected into the vacuum pump and to refrigerant pipeline (100) with secondary refrigerant pipeline (200) take out the vacuum.

13. A control method of a refrigerant recovery system according to claim 12, wherein:

comprising the following steps: judging whether the refrigerant in the air conditioner (1) to be recovered is clean refrigerant or not;

a control step of opening the first control valve (18) and closing the second control valve (17) and closing the third control valve (19) when it is judged that the refrigerant in the air conditioner (1) to be recovered is clean refrigerant; when it is judged that the refrigerant in the air conditioner (1) to be recovered is an unclean refrigerant, the second control valve (17) and the third control valve (19) are opened and the first control valve (18) is closed, and the compressor (11) is opened.

14. The control method according to claim 13, characterized in that:

further comprising a detection step of detecting a refrigerant flow state in the refrigerant line by the liquid-viewing device (15);

and a control step of opening the first control valve (18) or the second control valve (17) by opening a refrigerant recovery operation when a liquid refrigerant exists in the refrigerant line.

15. The control method according to claim 14, characterized in that:

when further comprising a semiconductor refrigeration sheet (22):

the control step is to control the semiconductor refrigeration piece (22) to work and vacuumize the refrigerant pipeline and the secondary refrigerant pipeline before refrigerant recovery, and then open the first control valve (18), the second control valve (17), the third control valve (19) and the fourth control valve (20) and vacuumize; when the pressure detection device (16) detects that the pressure is lower than the preset pressure, the vacuumizing is closed, and the refrigerant recovery control action is performed.