Refrigerant recovery system and control method thereof

Abstract

The application provides a refrigerant recovery system and a control method thereof. The refrigerant recovery system comprises a to-be-recovered air conditioner, a liquid storage tank, a first heat exchanger, a second heat exchanger, a radiator, refrigerant pipelines and a coolant pipeline. The to-be-recovered air conditioner, the first heat exchanger and the liquid storage tank are arranged on the refrigerant pipelines, and the second heat exchanger and the radiator are arranged on the coolant pipeline. The first heat exchanger is connected with or arranged close to the second heat exchanger to cool the refrigerant in the first heat exchanger. The coolant after heat exchange in the second heat exchanger can enter the radiator. The radiator is arranged close to the to-be-recovered air conditioner to heat the refrigerant in the to-be-recovered air conditioner. According to the application, the pressure of the refrigerant entering the liquid storage tank can be reduced, that is, the pressure of the high-pressure part (exhaust) of the compressor can be effectively reduced. Meanwhile, the temperature and pressure of the refrigerant in the to-be-recovered air conditioner are improved, so that the high-low pressure ratio of the compressor is effectively reduced, and the recovery efficiency of the refrigerant is improved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and more specifically to a refrigerant recovery system and its control method. Background Technology

[0002] With the increasing emphasis on environmental protection, the market demand for refrigerant recovery is growing rapidly. However, conventional refrigerant recovery systems suffer from slow recovery speeds and low efficiency due to the large high-low pressure ratio. Furthermore, they cannot recover the pressure energy of the refrigerant during the recovery process.

[0003] Because existing refrigerant recovery machines suffer from technical problems such as low recovery efficiency, long recovery time, and insufficient energy recovery efficiency, this invention studies and designs a refrigerant recovery system and its control method. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low recovery efficiency, long recovery time and insufficient energy recovery efficiency of the existing refrigerant recovery machine, thereby providing a refrigerant recovery system and its control method.

[0005] To address the above problems, the present invention provides a refrigerant recovery system, comprising:

[0006] The system includes an air conditioner to be recycled, a liquid storage tank, a first heat exchanger, a second heat exchanger, a radiator, refrigerant piping, and a refrigerant transfer line. The air conditioner to be recycled, the first heat exchanger, and the liquid storage tank are arranged on the refrigerant piping so that refrigerant can flow from the air conditioner to the first heat exchanger and then to the liquid storage tank. The second heat exchanger and the radiator are arranged on the refrigerant transfer line so that refrigerant can flow from the second heat exchanger to the radiator. The first heat exchanger and the second heat exchanger are connected or close to each other so that the refrigerant in the first heat exchanger can exchange heat with the refrigerant in the second heat exchanger to cool down the refrigerant in the first heat exchanger. The refrigerant after heat exchange in the second heat exchanger can enter the radiator. The radiator is close to the air conditioner to be recycled so that the radiator can heat the refrigerant in the air conditioner.

[0007] In some implementations...

[0008] The first heat exchanger and the second heat exchanger are spaced apart, and a semiconductor refrigeration chip is also disposed between the first heat exchanger and the second heat exchanger. The cold end of the semiconductor refrigeration chip faces the first heat exchanger so as to absorb heat from the first heat exchanger, and the hot end of the semiconductor refrigeration chip faces the second heat exchanger so as to release heat to the second heat exchanger. The first heat exchanger is also provided with a cold storage material, and the second heat exchanger is also provided with a heat storage material.

[0009] In some implementations...

[0010] The radiator is spaced apart from the air conditioner to be recycled, and is located upstream of the air conditioner to be recycled along the direction of air flow, so that the air heated by the radiator flows to the air conditioner to be recycled to heat the refrigerant in the air conditioner to be recycled.

[0011] In some implementations...

[0012] It also includes a fan, which is spaced apart from the radiator and is located upstream or downstream of the radiator along the airflow direction, so as to drive airflow into the radiator to exchange heat with the refrigerant in the radiator.

[0013] In some implementations...

[0014] The refrigerant pipeline includes a first refrigerant pipeline, one end of which is connected to the outlet of the air conditioner to be recycled, and the other end is connected to the inlet of the first heat exchanger. A first control valve is provided on the first refrigerant pipeline; a fourth control valve is also provided at the inlet end of the liquid storage tank.

[0015] The refrigerant pipeline includes a second refrigerant pipeline. One end of the second refrigerant pipeline is connected to the outlet of the air conditioner to be recycled, and the other end is connected to the inlet of the first heat exchanger. The second refrigerant pipeline is equipped with a compressor, a second control valve, and a third control valve. The second control valve is located on the refrigerant inlet side of the compressor, and the third control valve is located on the refrigerant outlet side of the compressor.

[0016] In some implementations...

[0017] The second refrigerant line is also equipped with a first dryer filter and an oil separator. The first dryer filter is installed on the refrigerant inlet side of the compressor, and the oil separator is installed on the refrigerant outlet side of the compressor.

[0018] In some implementations...

[0019] A third heat exchanger is installed on the refrigerant inlet side of the compressor, and a fourth heat exchanger is installed on the refrigerant outlet side of the compressor. The third heat exchanger and the fourth heat exchanger are close to each other and spaced apart. A first semiconductor thermoelectric generator is installed between the third heat exchanger and the fourth heat exchanger. The first semiconductor thermoelectric generator can generate electricity based on the temperature difference between the third heat exchanger and the fourth heat exchanger.

[0020] In some implementations...

[0021] A fifth heat exchanger is also provided on the refrigerant inlet side of the compressor, and a sixth heat exchanger is also provided on the refrigerant pipeline located between the second heat exchanger and the radiator. The fifth heat exchanger and the sixth heat exchanger are close to each other and spaced apart. A second semiconductor thermoelectric generator is provided between the fifth heat exchanger and the sixth heat exchanger. The second semiconductor thermoelectric generator can generate electricity based on the temperature difference between the fifth heat exchanger and the sixth heat exchanger.

[0022] In some implementations...

[0023] The refrigerant pipeline forms a circulation loop, and a water pump is also installed on the refrigerant pipeline; an expander is also installed on the refrigerant inlet side pipeline of the compressor, and a generator is also installed connected to the expander; the refrigerant recovery system also includes an energy storage device, which is electrically connected to the generator; the energy storage device is also electrically connected to the semiconductor refrigeration chip.

[0024] In some implementations...

[0025] An expander is also installed on the refrigerant inlet side of the compressor, and a generator is also installed connected to the expander. The refrigerant recovery system also includes an energy storage device, which is electrically connected to the generator. The energy storage device is also electrically connected to the first thermoelectric generator.

[0026] In some implementations...

[0027] An expander is also installed on the refrigerant inlet side of the compressor, and a generator is also installed connected to the expander. The refrigerant recovery system also includes an energy storage device, which is electrically connected to the generator. The energy storage device is also electrically connected to the second thermoelectric generator.

[0028] In some implementations...

[0029] The outlet end of the air conditioner to be recycled is also equipped with a second dryer filter, a liquid level sight glass, and a pressure detection device. The liquid level sight glass can detect and determine whether there is liquid refrigerant in the refrigerant pipeline. Along the direction of refrigerant flow, the second dryer filter, the liquid level sight glass, and the pressure detection device are all located upstream of the first refrigerant pipeline, and the second dryer filter, the liquid level sight glass, and the pressure detection device are also located upstream of the second refrigerant pipeline. The second dryer filter can be connected to a vacuum pump to evacuate the refrigerant pipeline and the refrigerant line.

[0030] The present invention also provides a control method for a refrigerant recovery system as described above, comprising: a judgment step, judging whether the refrigerant in the air conditioner to be recovered is a clean refrigerant;

[0031] The control steps are as follows: when it is determined that the refrigerant in the air conditioner to be recycled is a clean refrigerant, the first control valve is opened and the second control valve and the third control valve are closed; when it is determined that the refrigerant in the air conditioner to be recycled is a non-clean refrigerant, the second control valve and the third control valve are opened and the first control valve is closed, and the compressor is turned on.

[0032] In some implementations...

[0033] It also includes a detection step, which uses the sight glass to detect the refrigerant flow status in the refrigerant pipeline;

[0034] The judgment step determines whether there is liquid refrigerant in the refrigerant pipeline based on whether the refrigerant is flowing.

[0035] The control steps include initiating a refrigerant recovery operation when liquid refrigerant is present in the refrigerant pipeline by opening either the first control valve or the second control valve.

[0036] In some implementations...

[0037] When a thermoelectric cooler is also included:

[0038] The control steps include, before the refrigerant is recovered, controlling the semiconductor cooling chip to operate and evacuating the refrigerant pipeline and the coolant carrier pipeline. At this time, the first control valve, the second control valve, the third control valve, and the fourth control valve are opened and evacuation is performed. When the pressure detection device detects that the pressure is lower than the preset pressure, the evacuation is turned off and the refrigerant recovery control action is performed.

[0039] The refrigerant recovery system and control method provided by this invention have the following beneficial effects:

[0040] 1. This invention provides a first heat exchanger located on the refrigerant pipeline between the air conditioner to be recovered and the liquid receiver, and a second heat exchanger located on the refrigerant pipeline. The first and second heat exchangers can exchange heat, effectively utilizing the refrigerant in the second heat exchanger to cool the refrigerant in the first heat exchanger. This effectively reduces the temperature of the refrigerant entering the liquid receiver, thereby reducing its pressure and, consequently, the pressure of the high-pressure section (discharge) of the compressor. Simultaneously, the refrigerant heated by the second heat exchanger in the refrigerant pipeline is directed to a radiator for heat dissipation, and the dissipated heat is used to heat the refrigerant in the air conditioner to be recovered. This effectively increases the temperature and pressure of the refrigerant in the air conditioner to be recovered, thereby effectively reducing the high-low pressure ratio of the compressor and improving the refrigerant recovery efficiency.

[0041] 2. This invention further utilizes a semiconductor refrigeration chip positioned between the first and second heat exchangers. The cold end of the semiconductor refrigeration chip effectively absorbs heat from the refrigerant in the first heat exchanger, while the hot end releases heat to the refrigerant in the second heat exchanger. The cold end of the semiconductor refrigeration chip pre-cools the cold storage material and preheats the heat storage material. The cold storage material further reduces the saturation temperature of the recovered refrigerant, lowering its high-pressure output. Simultaneously, the heat recovered from the hot end of the semiconductor refrigeration chip is recycled through a liquid cooling system and used to heat the air conditioner to be recycled, increasing the low-pressure recovery pressure. This, in turn, reduces the compressor's high-low pressure ratio, improves compressor efficiency, and enhances the overall refrigerant recovery efficiency.

[0042] 3. The present invention also recovers the pressure energy of the refrigerant by using an expander. After the refrigerant passes through the expander, its internal energy and pressure energy decrease, and it outputs mechanical work to generate electricity. After the refrigerant passes through the expander, its temperature drops significantly. Through a semiconductor thermoelectric generator, a temperature difference between the two ends of the semiconductor occurs, generating electricity. Attached Figure Description

[0043] Figure 1 This is a system structure diagram of the refrigeration recovery system of the present invention.

[0044] The attached figures are labeled as follows:

[0045] 1. Air conditioner to be recycled; 2. Second dryer filter; 3. Expander; 4. Fifth heat exchanger; 5. Second thermoelectric generator; 6. Sixth heat exchanger; 7. Third heat exchanger; 8. First thermoelectric generator; 9. Fourth heat exchanger; 10. First dryer filter; 11. Compressor; 12. Oil separator; 13. First heat exchanger; 14. Liquid receiver; 15. Sight glass; 16. Pressure detection device; 17. Second control valve; 18. First control valve; 19. Third control valve; 20. Fourth control valve; 21. Generator; 22. Thermoelectric cooler; 23. Energy storage device; 24. Second heat exchanger; 25. Water pump; 26. Radiator; 27. Fan; 100. Refrigerant pipeline; 101. Refrigerant pipeline one; 102. Refrigerant pipeline two; 200. Refrigerant pipeline. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0052] like Figure 1 As shown, the present invention provides a refrigerant recovery system, which includes:

[0053] The system includes a refrigerant air conditioner 1 (i.e., a system to be recycled), a liquid storage tank 14, a first heat exchanger 13, a second heat exchanger 24, a radiator 26, a refrigerant pipeline 100, and a refrigerant transfer line 200. The refrigerant air conditioner 1, the first heat exchanger 13, and the liquid storage tank 14 are connected to the refrigerant pipeline 100 so that refrigerant can flow from the refrigerant air conditioner 1 to the first heat exchanger 13, and then to the liquid storage tank 14. The second heat exchanger 24 and the radiator 26 are connected to the refrigerant transfer line 200 so that refrigerant can transfer refrigerant from the refrigerant air conditioner 1 to the first heat exchanger 13, and then to the liquid storage tank 14. The refrigerant can flow from the second heat exchanger 24 to the radiator 26; the first heat exchanger 13 is connected to or 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 to cool the refrigerant in the first heat exchanger 13. The refrigerant after heat exchange in the second heat exchanger 24 can enter the radiator 26. The radiator 26 is close to the air conditioner 1 to be recycled so that the radiator 26 can heat the refrigerant in the air conditioner 1 to be recycled.

[0054] This invention involves installing a first heat exchanger on the refrigerant pipeline between the air conditioner to be recovered and the liquid receiver, and a second heat exchanger on the secondary refrigerant pipeline. The first and second heat exchangers are capable of exchanging heat, effectively utilizing the secondary refrigerant in the second heat exchanger to cool the refrigerant in the first heat exchanger. This effectively reduces the temperature of the refrigerant entering the liquid receiver, thereby reducing its pressure and consequently lowering the pressure of the high-pressure section (discharge) of the compressor. Simultaneously, the secondary refrigerant, heated by the second heat exchanger, is directed to a radiator for heat dissipation, and the dissipated refrigerant is then... The heat is used to heat the refrigerant in the air conditioner to be recovered, thereby effectively increasing the temperature and pressure of the refrigerant in the air conditioner to be recovered. This effectively reduces the high-low pressure ratio of the compressor (the discharge end of the compressor 11 is connected to the liquid receiver 14, so the pressure at the liquid receiver is approximately equivalent to the high-pressure end of the compressor; the suction end of the compressor is connected to the air conditioner to be recovered, so the pressure at the air conditioner to be recovered is approximately equivalent to the low-pressure end of the compressor). Because the pressure at the air conditioner to be recovered is increased while the pressure at the liquid receiver is reduced, the refrigerant can flow more easily from the air conditioner to the liquid receiver, thereby effectively improving the refrigerant recovery efficiency.

[0055] In some implementations...

[0056] The first heat exchanger 13 and the second heat exchanger 24 are spaced apart. A semiconductor refrigeration chip 22 is also disposed between the first heat exchanger 13 and the second heat exchanger 24. The cold end of the semiconductor refrigeration chip 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 refrigeration chip 22 faces the second heat exchanger 24 so as to release heat to the second heat exchanger 24. A cold storage material is also disposed inside the first heat exchanger 13, and a heat storage material is also disposed inside the second heat exchanger 24.

[0057] This invention further utilizes a semiconductor refrigeration chip positioned between the first and second heat exchangers. The cold end of the semiconductor refrigeration chip effectively absorbs heat from the refrigerant in the first heat exchanger, while the hot end releases heat to the refrigerant in the second heat exchanger. The cold end of the semiconductor refrigeration chip pre-cools the cold storage material and preheats the heat storage material. This further reduces the saturation temperature of the recovered refrigerant and lowers its high-pressure, effectively reducing the refrigerant pressure at the receiver tank. Simultaneously, the heat recovered from the hot end of the semiconductor refrigeration chip is recycled through a liquid cooling system and heated by the heat exchanger, increasing the low-pressure recovery pressure and further increasing the refrigerant pressure at the receiver tank. This further promotes the flow of refrigerant from the receiver tank to the receiver tank, further reducing the compressor's high-low pressure ratio, improving compressor efficiency, and ultimately enhancing the overall recovery efficiency.

[0058] This invention proposes a refrigerant recovery system, which includes semiconductor cooling, cold storage materials, heat storage materials, expander power generation, and semiconductor thermoelectric power generation. This system can reduce the high-low pressure ratio during refrigerant recovery, improve refrigerant recovery efficiency, reduce recovery time, and improve energy recovery efficiency.

[0059] The gaseous refrigerant sequentially passes through the first dryer filter 10, compressor 11, oil separator 12, and condenser (first heat exchanger 13) before entering the liquid receiver 14. During refrigerant recovery, the liquid refrigerant remaining in the air conditioner 1 continues to vaporize, causing its temperature to continuously decrease (usually below 0°C). The low-temperature gaseous refrigerant has lower pressure and lower density, while the liquid receiver 14 contains a higher-temperature (normally the system temperature is higher than the ambient temperature) and higher-pressure liquid refrigerant. This results in a large high-low pressure ratio in the compressor. A large high-low pressure ratio reduces the compressor's compression efficiency, while the low-density, low-temperature gaseous refrigerant reduces the compressor's recovery speed (reduces mass flow rate).

[0060] Therefore, in the refrigerant recovery system of the present invention, it is preferable to pre-cool the cold storage material and preheat the heat storage material by means of the cold end of the semiconductor refrigeration chip before refrigerant recovery. The cold storage material further reduces the saturation temperature of the recovered refrigerant and lowers the high pressure of the recovered refrigerant. At the same time, the heat recovered from the hot end of the semiconductor refrigeration chip is recovered through a liquid cooling system and heated by a heat exchanger to increase the low-pressure recovery pressure, thereby reducing the high-low pressure ratio of the compressor, improving the compressor efficiency, and improving the recovery efficiency.

[0061] In some implementations...

[0062] The radiator 26 is spaced apart from the air conditioner 1 to be recycled. The radiator 26 is located upstream of the air conditioner 1 to be recycled along the direction of air flow, so that the air heated by the radiator 26 flows to the air conditioner 1 to be recycled to heat the refrigerant in the air conditioner 1.

[0063] This is a further preferred structural form between the radiator and the air conditioner to be recycled in this invention. The radiator is an air-cooled radiator, which is located upstream of the airflow direction of the air conditioner to be recycled. This allows the radiator to heat the air flowing through it first, and then allow the heated air to flow through the air conditioner to be recycled, thereby effectively heating the refrigerant in the air conditioner to be recycled. This increases the temperature (pressure) of the refrigerant at the air conditioner to be recycled, that is, increases the pressure at the low-pressure end of the compressor, which is beneficial for the recovery of refrigerant.

[0064] In some implementations...

[0065] The system also includes a fan 27, which is spaced apart from the radiator 26 and positioned upstream or downstream of the radiator 26 along the airflow direction to drive airflow into the radiator 26 for heat exchange with the refrigerant. This is a further preferred structural form of the invention; the fan structure effectively drives airflow through the radiator to exchange heat with the refrigerant within it.

[0066] In some implementations...

[0067] The refrigerant pipeline 100 includes a refrigerant pipeline 101, one end of which is connected to the outlet of the air conditioner 1 to be recycled, and the other end is connected to the inlet of the first heat exchanger 13. A first control valve 18 is provided on the refrigerant pipeline 101. A fourth control valve 20 is also provided at the inlet end of the liquid storage tank 14.

[0068] The refrigerant pipeline 100 includes a second refrigerant pipeline 102. One end of the second refrigerant pipeline 102 is connected to the outlet of the air conditioner 1 to be recycled, and the other end is connected to the inlet of the first heat exchanger 13. The second refrigerant pipeline 102 is equipped with a compressor 11, a second control valve 17, and a third control valve 19. The second control valve 17 is located on the refrigerant inlet side of the compressor 11, and the third control valve 19 is located on the refrigerant outlet side of the compressor 11.

[0069] This is a preferred structural form of the refrigerant pipeline of the present invention. By configuring it into a structure including refrigerant pipeline one and refrigerant pipeline two, it is possible to open the corresponding pipelines in two different situations. The present invention preferably determines the control condition based on whether the refrigerant in the air conditioner to be recovered is clean. If the refrigerant is determined to be clean, it can be directly led to the first heat exchanger through refrigerant pipeline one, opening the first control valve 18 on refrigerant pipeline one while simultaneously closing the second control valve 17 and the third control valve 19 on refrigerant pipeline two. However, if the refrigerant is determined to be unclean, indicating that it contains certain impurities (including solid impurities), then refrigerant pipeline two needs to be opened to effectively filter and clean the refrigerant through the first dryer filter 10. Then, the compressor provides a certain amount of power to the refrigerant (because the refrigerant containing impurities has greater flow resistance, the compressor provides input power to effectively drive the refrigerant to the receiver tank). Furthermore, the first dryer filter, located on the refrigerant inlet side of the compressor, effectively filters the refrigerant before it enters the compressor, preventing it from entering and causing safety hazards. Therefore, this invention considers the factors of cleanliness and uncleanliness by using two different refrigerant pipelines to transport the refrigerant. This effectively ensures that even when impurities are present, the flow resistance is not too high, preventing the refrigerant from being effectively transported to the receiver tank. This further improves the refrigerant recovery rate and effectively prevents the compressor from sucking in impurities, thus preventing shutdowns and other malfunctions.

[0070] In some implementations...

[0071] The refrigerant pipeline 102 is also equipped with a first dryer filter 10 and an oil separator 12. The first dryer filter 10 is installed on the refrigerant inlet side pipeline of the compressor 11, and the oil separator 12 is installed on the refrigerant outlet side pipeline of the compressor 11.

[0072] This invention utilizes a first dryer filter installed on refrigerant line two to filter and remove impurities from the refrigerant entering the refrigerant line two. The refrigerant, after impurities are removed, then enters the compressor for compression, ensuring the compressor's normal operation. An oil separator installed on the compressor outlet line separates oil from the refrigerant at the compressor outlet, preventing oil from flowing out of the compressor and causing ineffective lubrication and cooling. The first dryer filter and the compressor on refrigerant line two effectively filter refrigerant containing impurities and provide transport power, preventing situations where high flow resistance prevents the refrigerant from being effectively transported to the receiver tank, further improving the refrigerant recovery rate.

[0073] In some implementations...

[0074] A third heat exchanger 7 is also provided on the refrigerant inlet side pipe of the compressor 11, and a fourth heat exchanger 9 is also provided on the refrigerant outlet side pipe of the compressor 11. The third heat exchanger 7 and the fourth heat exchanger 9 are arranged close to each other and spaced apart. A first semiconductor thermoelectric generator 8 is provided between the third heat exchanger 7 and the fourth heat exchanger 9. The first semiconductor thermoelectric generator 8 can generate electrical energy according to the temperature difference between the third heat exchanger 7 and the fourth heat exchanger 9.

[0075] The present invention also provides a third heat exchanger on the refrigerant inlet side of the compressor and a fourth heat exchanger on the refrigerant outlet side of the compressor. Since there is a large temperature difference between the refrigerant at the compressor inlet and outlet, the third and fourth heat exchangers are arranged close to each other and spaced apart. A first semiconductor thermoelectric generator is also arranged between them. This can effectively utilize the temperature difference between the third and fourth heat exchangers to generate electricity and can effectively recover the temperature difference energy of the refrigerant to generate electricity.

[0076] In some implementations...

[0077] A fifth heat exchanger 4 is also provided on the refrigerant inlet side of the compressor 11. A sixth heat exchanger 6 is also provided on the refrigerant pipeline and on the pipeline located 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 and spaced apart. A second semiconductor thermoelectric generator 5 is provided between the fifth heat exchanger 4 and the sixth heat exchanger 6. The second semiconductor thermoelectric generator 5 can generate electrical energy according to the temperature difference between the fifth heat exchanger 4 and the sixth heat exchanger 6.

[0078] The present invention also includes a fifth heat exchanger installed on the refrigerant inlet side of the compressor and a sixth heat exchanger installed on the refrigerant pipeline at the outlet end of the second heat exchanger. Since there is a large temperature difference between the refrigerant temperature at the compressor inlet and the refrigerant after being heated by the second heat exchanger, the fifth and sixth heat exchangers are installed close to each other and spaced apart. A second semiconductor thermoelectric generator is also installed between them. This can effectively utilize the temperature difference between the fifth and sixth heat exchangers to generate electricity and can effectively recover the temperature difference energy between the refrigerant and the refrigerant to generate electricity.

[0079] In some implementations...

[0080] The refrigerant pipeline forms a circulation loop, and a water pump 25 is also installed on the refrigerant pipeline 200; an expander 3 is also installed on the refrigerant inlet side pipeline of the compressor 11, and a generator 21 is also installed connected to the expander 3; the refrigerant recovery system also includes an energy storage device 23 (preferably a battery), the energy storage device 23 is electrically connected to the generator 21; the energy storage device 23 is also electrically connected to the semiconductor refrigeration chip 22.

[0081] This is a further preferred structural form of the present invention. An expander installed on the refrigerant inlet pipe of the compressor can expand and depressurize the refrigerant from the air conditioner to be recovered, forming a low pressure and introducing it to the low-pressure suction end of the compressor. The work generated by the expansion of the expander can be effectively used to drive the generator to generate electricity. This part of the electricity can be stored through an energy storage device for backup power use, thus improving the energy utilization efficiency of the refrigeration system. Furthermore, the energy storage device is also electrically connected to the thermoelectric cooler, which can absorb the electrical energy generated by the thermoelectric cooler due to temperature difference, further improving the energy utilization efficiency of the refrigeration system.

[0082] In some implementations...

[0083] An expander 3 is also installed on the refrigerant inlet side of the compressor 11, and a generator 21 is also installed connected to the expander 3. The refrigerant recovery system also includes an energy storage device 23, which is electrically connected to the generator 21. The energy storage device 23 is also electrically connected to the first thermoelectric generator 8.

[0084] This is a further preferred structural form of the present invention. An expander installed on the refrigerant inlet pipe of the compressor can expand and depressurize the refrigerant from the air conditioner to be recovered, forming a low pressure and introducing it to the low-pressure suction end of the compressor. The work generated by the expansion of the expander can be effectively used to drive the generator to generate electricity. This part of the electricity can be stored through an energy storage device for backup power use, thus improving the energy utilization efficiency of the refrigeration system. Furthermore, the energy storage device is also electrically connected to the first thermoelectric generator, which can absorb the electricity generated by the thermoelectric generator due to the temperature difference, further improving the energy utilization efficiency of the refrigeration system.

[0085] In some implementations...

[0086] An expander 3 is also installed on the refrigerant inlet side of the compressor 11, and a generator 21 is also installed connected to the expander 3. The refrigerant recovery system also includes an energy storage device 23, which is electrically connected to the generator 21. The energy storage device 23 is also electrically connected to the second thermoelectric generator 5.

[0087] This is a further preferred structural form of the present invention. An expander installed on the refrigerant inlet pipe of the compressor can expand and depressurize the refrigerant from the air conditioner to be recovered, forming a low pressure and introducing it to the low-pressure suction end of the compressor. The work generated by the expansion of the expander can be effectively used to drive the generator to generate electricity. This part of the electricity can be stored through an energy storage device for backup power use, thus improving the energy utilization efficiency of the refrigeration system. Furthermore, the energy storage device is also electrically connected to a second thermoelectric generator, which can absorb the electricity generated by the second thermoelectric generator due to the temperature difference, further improving the energy utilization efficiency of the refrigeration system.

[0088] In some implementations...

[0089] The outlet end of the air conditioner to be recycled 1 is also equipped with a second dryer filter 2, a liquid level indicator 15, and a pressure detection device 16. The liquid level indicator 15 can detect and determine whether there is liquid refrigerant in the refrigerant pipeline. Along the direction of refrigerant flow, the second dryer filter 2, the liquid level indicator 15, and the pressure detection device 16 are all located upstream of the first refrigerant pipeline 101, and the second dryer filter 2, the liquid level indicator 15, and the pressure detection device 16 are also located upstream of the second refrigerant pipeline 102. The second dryer filter 2 can be connected to a vacuum pump to evacuate the refrigerant pipeline 100 and the refrigerant pipeline 200.

[0090] This is a further preferred structural form of the refrigeration system of the present invention. The second dryer filter can dry and filter the refrigerant at the outlet of the air conditioner to be recovered. The sight glass is preferred to be a sight glass, which can clearly observe whether the refrigerant in the refrigerant pipeline is liquid. The pressure detection device can detect the pressure value in the refrigerant pipeline in real time and determine whether the vacuuming process has started or ended. The second dryer filter can also be connected to a vacuum pump to evacuate the refrigerant pipeline and the coolant pipeline, so as to control and operate the recovery of refrigerant after vacuuming.

[0091] The refrigerant recovery system of the present invention includes a second dryer 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 dryer filter 10, a compressor 11, an oil separator 12, a fourth heat exchanger 9 (preferably a heat exchange plate), a first heat exchanger 13 internally filled with cold storage material, a liquid storage tank 14, a sight glass 15 (preferably a sight glass), a pressure detection device 16 (preferably a pressure gauge), a second control valve 17 (preferably a shut-off valve), a first control valve 18 (preferably a shut-off valve), a third control valve 19 (preferably a shut-off valve), and a fourth control valve 20 (preferably a shut-off valve).

[0092] The refrigerant suction pipe is connected to the air conditioner 1 to be recycled. It first passes through the second dryer filter 2 and enters the sight glass. The refrigerant from the sight glass splits into two paths. One path passes through the second control valve 17 and enters the expander 3. It then enters the fifth heat exchanger 4 and passes through the third heat exchanger 7. Next, it passes through the first dryer filter 10 and enters the compressor 11 for compression. The compressed refrigerant then enters the oil separator 12 and then enters the fourth heat exchanger 9 for cooling. The refrigerant from the fourth heat exchanger 9 passes through the third control valve 19 and enters the first heat exchanger 13, which is filled with cold storage material. Finally, it passes through the fourth control valve 20 and enters the liquid storage tank 14. The other path passes through the first control valve 18 and is connected to the first heat exchanger 13, which is filled with cold storage material. Finally, it passes through the fourth control valve 20 and enters the liquid storage tank 14.

[0093] 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 material, and a sixth heat exchanger 6.

[0094] The power generation and energy storage system consists of a generator 21, a second thermoelectric generator 5, a first thermoelectric generator 8, an energy storage device 23, and a thermoelectric cooler 22.

[0095] The present invention also provides a control method for a refrigerant recovery system as described above, comprising:

[0096] The judgment step is to determine whether the refrigerant in the air conditioner 1 to be recycled is a clean refrigerant;

[0097] The control steps are as follows: when it is determined that the refrigerant in the air conditioner 1 to be recycled is a clean refrigerant, the first control valve 18 is opened and the second control valve 17 and the third control valve 19 are closed; when it is determined that the refrigerant in the air conditioner 1 to be recycled is a non-clean 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 turned on.

[0098] This invention determines the cleanliness of the refrigerant in the air conditioner to be recycled, thus opening the corresponding pipelines in two different ways. Preferably, the control condition is the cleanliness of the refrigerant. If the refrigerant is determined to be clean, it can be directly led to the first heat exchanger through refrigerant pipeline one, opening the first control valve 18 on refrigerant pipeline one while simultaneously closing the second control valve 17 and the third control valve 19 on refrigerant pipeline two. However, if the refrigerant is determined to be unclean, indicating the presence of impurities (including solid impurities), then refrigerant pipeline two needs to be opened to effectively filter and clean the refrigerant through the first dryer filter 10 before the compressor delivers the refrigerant. The compressor provides a certain amount of power (because the refrigerant containing impurities has greater flow resistance, the input power provided by the compressor can effectively drive the refrigerant to flow to the receiver tank), and the first dryer filter is set on the refrigerant inlet side of the compressor to effectively filter the refrigerant before it enters the compressor, preventing it from entering the compressor and causing safety hazards; therefore, the present invention takes into account the factors of clean or unclean refrigerant and uses two different refrigerant pipelines to transport the refrigerant, which can effectively ensure that the refrigerant cannot be effectively transported to the receiver tank due to greater flow resistance when impurities are present, further improving the refrigerant recovery rate, and effectively preventing the compressor from sucking in impurities and causing malfunctions such as shutdown.

[0099] If the refrigerant in the air conditioner 1 to be recycled is known to be clean, then step ① can be used; otherwise, proceed directly to step ②. (At this time, compressor 11 does not compress, but only serves as a channel.) The liquid receiver 14 is initially evacuated, and the pressure in the liquid receiver 14 gradually increases during the recycling process, thus forming a high pressure.

[0100] When refrigerant recovery begins, observe the sight glass. If the refrigerant is found to be liquid, close the second control valve 17 and the third control valve 19, and open the first control valve 18 and the fourth control valve 20. The semiconductor cooling chip 22 continues to operate. At this time, the storage tank is under negative pressure. Due to the pressure difference and the fact that the temperature of the first heat exchanger 13, which is filled with cold storage material, is lower than the ambient temperature, while the temperature of the refrigerant in the air conditioner to be recovered is close to the ambient temperature, the refrigerant exits from the air conditioner to be recovered, passes through the dryer filter, the sight glass, and the first control valve 18 in sequence, and flows to the first heat exchanger 13. After being cooled by the pre-cooled cold storage material, it flows into the storage tank 14 through the fourth control valve 20. At the same time, the water pump 25 and the fan 27 are turned on, so that the coolant (i.e., the refrigerant) circulates in the liquid cooling system (i.e., the cold storage system) (the coolant can be water). The coolant carries away the heat from the preheated heat storage material in the second heat exchanger 24 and first enters the sixth heat exchanger 6 for heating. Because the temperature of the fifth heat exchanger 4 is close to room temperature, while the temperature of the sixth heat exchanger 6 is higher than room temperature after heating, the second thermoelectric generator 5 generates electricity to charge the energy storage device 23 under the effect of the temperature difference. The coolant then enters the radiator 26, where it dissipates heat under the influence of the fan 27. The dissipated heat heats the air conditioner 1 to be recovered, increasing the pressure inside and causing the refrigerant to flow further into the liquid storage tank 14. When it is observed that the refrigerant in the sight glass has stopped flowing, the first control valve 18 and the fourth control valve 20 are closed.

[0101] ② Open the second control valve 17, the third control valve 19, and the fourth control valve 20, and close the first control valve 18. Simultaneously, start the compressor 11, the thermoelectric cooler 22, the water pump 25, and the fan 27. The coolant heats the sixth heat exchanger 6, and the heat dissipated by the radiator 26 continues to heat the air conditioner 1 to be recycled. The refrigerant exits from the air conditioner 1 to be recycled, passes through the second dryer filter 2, the sight glass, and the second control valve 17 in sequence, and then enters the expander 3. After passing through the expander 3, the internal energy and pressure energy of the refrigerant decrease. The expander 3 outputs mechanical work, driving the generator 21 to generate electricity. The generated electrical energy charges the energy storage device 23 and is stored. After passing through the expander 3, the temperature of the refrigerant drops significantly, and it enters the fifth heat exchanger 4. Passing through the second thermoelectric generator 5, a temperature difference appears between the two ends of the semiconductor, generating electrical energy to charge the energy storage device 23 and be stored. The lower-temperature refrigerant from the fifth heat exchanger 4 enters the third heat exchanger 7, creating a temperature difference with the fourth heat exchanger 9. This temperature difference is generated by the first semiconductor thermoelectric generator 8, which generates electricity to charge the energy storage device 23 and store it. The refrigerant from the third heat exchanger 7 passes through the first dryer filter 10 and is then drawn into the compressor 11. The high-temperature, high-pressure refrigerant from the compressor 11 passes through the oil separator 12 and enters the fourth heat exchanger 9 for heat release and cooling. After passing through the third control valve 19, it flows to the first heat exchanger 13, where it is cooled by the pre-cooled cold storage material. Finally, it flows through the fourth control valve 20 into the liquid storage tank 14.

[0102] ③ When no liquid flow is observed in the sight glass and the absolute pressure on the pressure gauge is below 1 bar (indicating that the refrigerant in the air conditioner to be recovered has been basically recovered), first close the fourth control valve 20, the second control valve 17, and the first control valve 18, then turn off the compressor 11, stop the operation of the thermoelectric cooler 22, stop the water pump 25, and stop the operation of the fan 27. The present invention's operation of first closing the fourth control valve 20, the second control valve 17, and the first control valve 18, and then turning off the compressor 11, prevents refrigerant backflow in the liquid storage tank 14 and prevents ambient air from entering and contaminating the refrigerant recovery machine; stopping the thermoelectric cooler 22 first, and then stopping the water pump and fan, is to prevent the thermoelectric cooler 22 from overheating.

[0103] In some implementations...

[0104] It also includes a detection step, in which the flow state of the refrigerant in the refrigerant pipeline is detected by the sight glass 15;

[0105] The judgment step determines whether there is liquid refrigerant in the refrigerant pipeline based on whether the refrigerant is flowing.

[0106] The control step involves initiating a refrigerant recovery operation when liquid refrigerant is present in the refrigerant pipeline by opening either the first control valve 18 or the second control valve 17.

[0107] The control steps of this invention further detect and determine whether the vacuuming process has been effectively completed by detecting and judging the presence of liquid refrigerant. After vacuuming, the refrigerant pipeline and the coolant pipeline become negative pressure, so the refrigerant will become liquid accordingly. Therefore, performing the refrigerant recovery operation can improve the refrigerant recovery rate.

[0108] In some implementations...

[0109] When the semiconductor refrigeration chip 22 is also included:

[0110] Before the refrigerant is recovered, the control steps involve controlling the semiconductor cooling chip 22 to operate and evacuating the refrigerant pipeline and the coolant carrier pipeline. At this time, the first control valve 18, the second control valve 17, the third control valve 19, and the fourth control valve 20 are opened, and the vacuum is evacuated. When the pressure detection device 16 detects that the pressure is lower than the preset pressure, the vacuum is turned off, and the refrigerant recovery control action is performed.

[0111] This invention further enhances the refrigerant recovery rate by activating the thermoelectric cooler before refrigerant recovery. This pre-cools the cold storage material and preheats the heat storage material via the cold end of the thermoelectric cooler. The cold storage material further lowers the saturation temperature of the recovered refrigerant, reducing its high pressure. Simultaneously, the heat recovered from the hot end of the thermoelectric cooler is recycled through a liquid cooling system and heated by a heat exchanger, increasing the low-pressure recovery pressure and thus reducing the compressor's high-low pressure ratio, improving compressor efficiency, and ultimately, increasing the recovery efficiency. Furthermore, this invention involves evacuating the refrigerant and refrigerant lines before refrigerant recovery. This creates a negative pressure in the refrigerant and refrigerant lines, causing the refrigerant to liquefy. Therefore, this refrigerant recovery further improves the recovery rate.

[0112] like Figure 1 The specific operation mode of the refrigerant recovery system of the present invention is as follows:

[0113] By manually observing the sight glass, one can determine the flow state of the refrigerant inside the pipe (whether there is liquid refrigerant and whether the liquid refrigerant is flowing inside the pipe).

[0114] Before refrigerant recovery, the liquid storage tank 14 and the refrigerant system need to be evacuated. During evacuation, open the second control valve 17, the first control valve 18, the third control valve 19, and the fourth control valve 20. Connect the vacuum pump before the second dryer filter 2 and observe the pressure gauge. Stop evacuating when the absolute pressure is lower than 40 Pa.

[0115] Before the refrigerant is recovered by the recovery system, the semiconductor refrigeration chip 22 is activated in advance (when an external power source is connected, the semiconductor refrigeration chip 22 is powered by the external power source; when there is no external power source, the semiconductor refrigeration chip 22 is powered by the energy storage device 23). The cold end of the semiconductor refrigeration chip cools the first heat exchanger 13, which is filled with cold storage material (the internal cold storage material can be water), and the hot end of the semiconductor refrigeration chip heats the second heat exchanger 24, which is filled with heat storage material (the internal cold storage material can be paraffin wax).

[0116] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A refrigerant recovery system, characterized in that: include: The refrigerant system includes an air conditioner (1) to be recycled, a liquid storage tank (14), a first heat exchanger (13), a second heat exchanger (24), a radiator (26), a refrigerant pipeline (100), and a refrigerant transfer line (200). The air conditioner (1), the first heat exchanger (13), and the liquid storage tank (14) are mounted on the refrigerant pipeline (100) so that refrigerant can flow from the air conditioner (1) to the first heat exchanger (13) and then to the liquid storage tank (14). The second heat exchanger (24) and the radiator (26) are mounted on the refrigerant transfer line (200) so that refrigerant can transfer refrigerant from the air conditioner (1) to the first heat exchanger (13) and then to the liquid storage tank (14). The refrigerant can flow from the second heat exchanger (24) to the radiator (26); the first heat exchanger (13) is connected to or 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) to cool down the refrigerant in the first heat exchanger (13), and the refrigerant after heat exchange in the second heat exchanger (24) can enter the radiator (26), and the radiator (26) is close to the air conditioner (1) to be recycled so that the radiator (26) can heat the refrigerant in the air conditioner (1) to be recycled; The refrigerant pipeline (100) includes a first refrigerant pipeline (101), one end of which is connected to the outlet of the air conditioner to be recycled (1), and the other end is connected to the inlet of the first heat exchanger (13). A first control valve (18) is provided on the first refrigerant pipeline (101); a fourth control valve (20) is also provided at the inlet end of the liquid storage tank (14). The refrigerant pipeline (100) includes a second refrigerant pipeline (102). One end of the second refrigerant pipeline (102) can be connected to the outlet of the air conditioner (1) to be recycled, and the other end can be connected to the inlet of the first heat exchanger (13). The second refrigerant pipeline (102) is equipped with a compressor (11), a second control valve (17) and a third control valve (19). The second control valve (17) is located on the refrigerant inlet side pipeline of the compressor (11), and the third control valve (19) is located on the refrigerant outlet side pipeline of the compressor (11). The second refrigerant line (102) is also equipped with a first dryer filter (10). The first dryer filter (10) is located on the refrigerant inlet side of the compressor (11) and can open the corresponding line in two different situations. The control condition is whether the refrigerant in the air conditioner to be recovered is clean. If the refrigerant is clean, it is directly led to the first heat exchanger (13) through the first refrigerant line (101). The first control valve (18) on the first refrigerant line (101) is opened and the second control valve (17) and the third control valve (19) on the second refrigerant line (102) are closed at the same time. However, if the refrigerant is not clean, the second refrigerant line (102) is opened at this time, and the refrigerant is filtered and cleaned by the first dryer filter (10), and then the compressor provides operating power to the refrigerant.

2. The refrigerant recovery system according to claim 1, characterized in that: The first heat exchanger (13) and the second heat exchanger (24) are spaced apart. A semiconductor refrigeration chip (22) is also provided between the first heat exchanger (13) and the second heat exchanger (24). The cold end of the semiconductor refrigeration chip (22) faces the first heat exchanger (13) so that it can absorb heat from the first heat exchanger (13), and the hot end of the semiconductor refrigeration chip (22) faces the second heat exchanger (24) so ​​that it can release heat to the second heat exchanger (24). The first heat exchanger (13) is also provided with a cold storage material, and the second heat exchanger (24) is also provided with a heat storage material.

3. The refrigerant recovery system according to claim 1, characterized in that: The radiator (26) is spaced apart from the air conditioner (1) to be recycled. The radiator (26) is located upstream of the air conditioner (1) along the direction of air flow, so that the air heated by the radiator (26) flows to the air conditioner (1) to heat the refrigerant in the air conditioner (1).

4. The refrigerant recovery system according to claim 3, characterized in that: It also includes a fan (27), which is spaced apart from the radiator (26) and is located upstream or downstream of the radiator (26) along the airflow direction, so as to drive airflow into the radiator (26) to exchange heat with the refrigerant in the radiator (26).

5. The refrigerant recovery system according to claim 1, characterized in that: An oil separator (12) is also provided on the refrigerant pipeline (102), and the oil separator (12) is located on the refrigerant outlet side of the compressor (11).

6. The refrigerant recovery system according to claim 1, characterized in that: A third heat exchanger (7) is also provided on the refrigerant inlet side pipe of the compressor (11), and a fourth heat exchanger (9) is also provided on the refrigerant outlet side pipe of the compressor (11). The third heat exchanger (7) and the fourth heat exchanger (9) are close to each other and spaced apart. A first semiconductor thermoelectric generator (8) is provided between the third heat exchanger (7) and the fourth heat exchanger (9). The first semiconductor thermoelectric generator (8) can generate electrical energy according to the temperature difference between the third heat exchanger (7) and the fourth heat exchanger (9).

7. The refrigerant recovery system according to claim 1, characterized in that: A fifth heat exchanger (4) is also provided on the refrigerant inlet side of the compressor (11), and a sixth heat exchanger (6) is also provided on the refrigerant pipeline and on the pipeline between the second heat exchanger (24) and the radiator (26). The fifth heat exchanger (4) and the sixth heat exchanger (6) are close to each other and spaced apart. A second semiconductor thermoelectric generator (5) is provided between the fifth heat exchanger (4) and the sixth heat exchanger (6). The second semiconductor thermoelectric generator (5) can generate electrical energy according to the temperature difference between the fifth heat exchanger (4) and the sixth heat exchanger (6).

8. The refrigerant recovery system according to claim 1, characterized in that: The refrigerant pipeline forms a circulation loop, and a water pump (25) is also provided on the refrigerant pipeline (200); when a semiconductor refrigeration chip (22) is also provided between the first heat exchanger (13) and the second heat exchanger (24), an expander (3) is also provided on the refrigerant inlet side pipeline of the compressor (11), and a generator (21) is also provided connected to the expander (3). The refrigerant recovery system also includes an energy storage device (23), which is electrically connected to the generator (21); the energy storage device (23) is also electrically connected to the semiconductor refrigeration chip (22).

9. The refrigerant recovery system according to claim 6, characterized in that: An expander (3) is also provided on the refrigerant inlet side of the compressor (11), and a generator (21) is also provided connected to the expander (3). The refrigerant recovery system also includes an energy storage device (23), which is electrically connected to the generator (21). The energy storage device (23) is also electrically connected to the first thermoelectric generator (8).

10. The refrigerant recovery system according to claim 7, characterized in that: An expander (3) is also installed on the refrigerant inlet side of the compressor (11), and a generator (21) is also installed connected to the expander (3). The refrigerant recovery system also includes an energy storage device (23), which is electrically connected to the generator (21). The energy storage device (23) is also electrically connected to the second thermoelectric generator (5).

11. The refrigerant recovery system according to any one of claims 1-10, characterized in that: The outlet end of the air conditioner to be recycled (1) is also provided with a second dryer filter (2), a liquid level indicator (15), and a pressure detection device (16). The liquid level indicator (15) can detect and determine whether there is liquid refrigerant in the refrigerant pipeline. Along the direction of refrigerant flow, the second dryer filter (2), the liquid level indicator (15), and the pressure detection device (16) are all located upstream of the first refrigerant pipeline (101), and the second dryer filter (2), the liquid level indicator (15), and the pressure detection device (16) are also located upstream of the second refrigerant pipeline (102). The second dryer filter (2) can be connected to a vacuum pump to evacuate the refrigerant pipeline (100) and the refrigerant pipeline (200).

12. A control method for a refrigerant recovery system as described in claim 11, characterized in that: include: The judgment step is to determine whether the refrigerant in the air conditioner (1) to be recycled is a clean refrigerant; In the control steps, when it is determined that the refrigerant in the air conditioner (1) to be recycled is a clean refrigerant, the first control valve (18) is opened and the second control valve (17) and the third control valve (19) are closed; when it is determined that the refrigerant in the air conditioner (1) to be recycled is a non-clean 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 turned on.

13. The control method according to claim 12, characterized in that: It also includes a detection step, which uses the sight glass (15) to detect the refrigerant flow state in the refrigerant pipeline; The judgment step determines whether there is liquid refrigerant in the refrigerant pipeline based on whether the refrigerant is flowing. Control steps: When liquid refrigerant is present in the refrigerant pipeline, the refrigerant recovery operation is initiated by opening the first control valve (18) or the second control valve (17).

14. The control method according to claim 13, characterized in that: When it also includes a semiconductor cooling chip (22): Before refrigerant recovery, the control steps involve controlling the semiconductor cooling chip (22) to operate and evacuating the refrigerant pipeline and the coolant carrier pipeline. At this time, the first control valve (18), the second control valve (17), the third control valve (19), and the fourth control valve (20) are opened and evacuation is performed. When the pressure detection device (16) detects that the pressure is lower than the preset pressure, the evacuation is turned off and the refrigerant recovery control action is performed.

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