Refrigerant recovery device and refrigerant recovery and purification system

Abstract

The utility model provides a refrigerant recovery device and a refrigerant recovery purification system, the refrigerant recovery device comprises a recovery tank, the recovery tank is provided with a refrigeration recovery port, and the refrigerant recovery device further comprises a distillation tank and a refrigeration part; the distillation retort is arranged close to the recovery tank, the refrigeration part is arranged between the distillation retort and the recovery tank, the refrigeration part is provided with a cold end and a hot end, the cold end faces the recovery tank and supplies cold energy to the recovery tank, and the hot end faces the distillation retort and supplies heat to the distillation retort; the distillation retort is provided with a distillation inlet and a distillation outlet. The refrigerant recovery device is simple in structure, the pressure of the recovery tank can be reduced, meanwhile, the distillation tank can be heated, the situation that the temperature of a refrigerant in the distillation tank is too low and influences the distillation effect due to continuous evaporation is prevented, meanwhile, the pressure of an air inlet of the compressor is increased, and the recovery rate can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerant recovery, in particular to a refrigerant recovery device and a refrigerant recovery and purification system. Background Art

[0002] Refrigerant recycling has become a consensus in more and more countries, and the recycling and reuse of refrigerants has attracted the attention of more and more people.

[0003] Currently, there is a lack of refrigerant recovery machines with purification functions on the market. Refrigerant that is simply recovered without purification is difficult to use directly. Furthermore, existing refrigerant recovery devices typically do not pre-cool the recovery tank, resulting in high tank pressure and affecting refrigerant recovery.

[0004] An existing refrigerant recovery device pre-cools the storage tank by arranging a refrigeration device outside the recovery tank, but the device has a complex structure, a large device volume, and a high cost. Utility Model Content

[0005] The first purpose of the utility model is to provide a refrigerant recovery device, which has a simple structure and can reduce the pressure of the recovery tank while heating the distillation tank to prevent the refrigerant from being too low in temperature due to continuous evaporation in the distillation tank, thereby affecting the distillation effect. At the same time, it increases the pressure of the compressor inlet, which can improve the recovery rate.

[0006] The second object of the present utility model is to provide a refrigerant recovery and purification system using the above-mentioned refrigerant recovery device.

[0007] In order to achieve the above-mentioned first purpose, the utility model provides a refrigerant recovery device, including a recovery tank, the recovery tank is provided with a refrigeration recovery port, the refrigerant recovery device also includes a distillation tank and a refrigeration component; the distillation tank is arranged close to the recovery tank, the refrigeration component is arranged between the distillation tank and the recovery tank, the refrigeration component is provided with a cold end and a hot end, the cold end is arranged toward the recovery tank and supplies cold energy to the recovery tank, and the hot end is arranged toward the distillation tank and supplies heat to the distillation tank; the distillation tank is provided with a distillation inlet and a distillation outlet.

[0008] It can be seen from the above scheme that by making the recovery tank and the distillation tank into an integrated structure and arranging a refrigeration component between the two, the cold end of the refrigeration component is used to cool the recovery tank, thereby reducing the pressure of the recovery tank, and the hot end of the refrigeration component is used to heat the distillation tank, thereby preventing the refrigerant from being too low in temperature due to continuous evaporation in the distillation tank, thereby affecting the distillation effect. At the same time, the pressure at the compressor inlet is increased, and the pressure at the recovery end is reduced. The pressure difference can be increased, which will greatly improve the recovery rate. At the same time, the refrigerant recovery device has a simple structure and a small equipment size, which can greatly reduce costs.

[0009] A preferred solution is that the recovery tank is further provided with a refrigeration cycle outlet, and the refrigeration cycle outlet is communicable with the distillation inlet.

[0010] It can be seen that by connecting the recovery tank with the distillation tank, the refrigerant can be circulated in the system to circulate and purify the refrigerant.

[0011] To achieve the above-mentioned second purpose, the utility model provides a refrigerant recovery and purification system, including a drying filter, a compressor, a condenser and a refrigerant recovery device; the refrigerant recovery device includes a recovery tank, a distillation tank and a refrigeration component; the distillation tank is arranged close to the recovery tank, and the distillation tank, the drying filter, the compressor, the condenser and the recovery tank are connected in sequence; the refrigeration component is arranged between the distillation tank and the recovery tank, and the refrigeration component is provided with a cold end and a hot end, the cold end faces the recovery tank and supplies cold energy to the recovery tank, and the hot end faces the distillation tank and supplies heat to the distillation tank.

[0012] It can be seen from the above scheme that by making the recovery tank and the distillation tank into an integrated structure and arranging a refrigeration component between the two, the cold end of the refrigeration component is used to cool the recovery tank, thereby reducing the pressure of the recovery tank, and the hot end of the refrigeration component is used to heat the distillation tank, thereby preventing the refrigerant from being too low in temperature due to continuous evaporation in the distillation tank, thereby affecting the distillation effect. At the same time, the pressure at the compressor inlet is increased, and the pressure at the recovery end is reduced. The pressure difference can be increased, which will greatly improve the recovery rate. At the same time, the refrigerant recovery device has a simple structure and a small equipment size, which can greatly reduce costs.

[0013] In addition, the refrigerant recovery and purification system of the present invention utilizes a compression-condensation method, distillation technology, and a high-efficiency drying filter to remove oil, water, acid, solid particles, and non-condensable gases due to differences in boiling points. It also has a self-purification function, which can utilize the heat of the compressor itself and the heat generated by the semiconductor heating to dry and regenerate components, greatly reducing the replacement frequency of components such as drying filters. Simultaneously, the system's circulating purification process utilizes the evaporation heat of the recovery tank to pre-cool the refrigerant storage tank. The hot and cold ends of the semiconductor can also be fully utilized for heat / cold storage, heating the distillation tank through heat storage and cooling the refrigerant storage tank through cold storage. Furthermore, by increasing the pressure at the intake end and reducing the pressure at the recovery end, further increasing the pressure differential will greatly increase the recovery rate.

[0014] A preferred solution is that the refrigerant recovery and purification system also includes a refrigerant online detection device, a refrigerant inlet pipe, a recovery tank outlet pipe and a distillation tank inlet pipe; the refrigerant online detection device is arranged on the refrigerant inlet pipe, and the two ends of the recovery tank outlet pipe are respectively connected to the inlet side of the refrigerant online detection device and the recovery tank; the two ends of the distillation tank inlet pipe are respectively connected to the outlet side of the refrigerant online detection device and the distillation tank; a first valve is provided on the recovery tank outlet pipe, and a second valve is provided on the distillation tank inlet pipe; in the refrigerant recovery mode, the first valve is closed and the second valve is opened; in the refrigerant circulation purification mode, both the first valve and the second valve are opened.

[0015] As can be seen, the refrigerant online detection device is used to detect indicators such as refrigerant moisture content and refrigerant purity. In refrigerant recovery mode, the first valve is closed and the second valve is open. The refrigerant passes through the recovery system, condenses into a high-pressure liquid, and then enters the recovery tank. In refrigerant circulation purification mode, both the first and second valves are open, and the refrigerant in the recovery tank re-enters the circulation system through the first valve for purification.

[0016] A further solution is that the refrigerant recovery and purification system also includes a first exhaust pipe; the first exhaust pipe is connected to the refrigerant inlet pipe, and the first exhaust pipe is connected between the outlet of the refrigerant online detection device and the second valve; a third valve is provided on the first exhaust pipe.

[0017] It can be seen that when the non-condensable gas content is still measured to be too high after several cycles of purification, and the recovery tank reaches a certain low temperature, the semiconductor refrigeration continues to cool down, the first valve and the third valve are opened, and the other valves are closed. The purity of the discharged refrigerant is tested by the refrigerant online detection device. When the purity is qualified, the third valve is closed.

[0018] A preferred solution is that the refrigerant recovery and purification system further includes a heat storage device and a heating pipe, the heat storage device is arranged on the drying filter and supplies heat to the drying filter, and the heating pipe supplies heat to the heat storage device.

[0019] It can be seen that the setting of the heating tube can heat the drying filter and thus realize the regeneration of the desiccant. The setting of the heat storage device can ensure that heat is continuously supplied to the drying filter, thereby ensuring the stability of the desiccant regeneration and achieving the purpose of reuse.

[0020] A further solution is that the refrigerant recovery and purification system also includes a bypass line, which is arranged in parallel with the condenser, and the heating pipe is located on the bypass line and connected to the bypass line; a fourth valve is provided on the bypass line, and the fourth valve is located on the inlet side of the heating pipe; the compressor and the condenser are connected through the condensation inlet pipe, the bypass line is connected to the condensation inlet pipe at a first position, and a fifth valve is provided on the condensation inlet pipe, and the fifth valve is located between the condenser and the first position; in the desiccant regeneration mode, the fourth valve is opened and the fifth valve is closed.

[0021] It can be seen that the high-temperature refrigerant coming out of the compressor enters the heating pipe through the bypass pipe, and the exhaust gas is used to heat the drying filter. At the same time, the compressor performs vacuuming, which greatly extends the life of the drying filter, reduces material consumption and reduces costs.

[0022] A preferred solution is that the condenser is connected to the recovery tank through a condensate outlet pipe, and a throttle valve is provided on the condensate outlet pipe; the refrigerant recovery and purification system also includes a second exhaust pipe, a sixth valve and a seventh valve; the second exhaust pipe is connected to the condensate outlet pipe at a second position, and the second position is located between the throttle valve and the recovery tank; the sixth valve is provided on the second exhaust pipe, and the seventh valve is provided on the condensate outlet pipe and is located between the second position and the recovery tank; in the desiccant regeneration mode, the seventh valve is first opened for a preset time and then closed, and the sixth valve is opened while the seventh valve is closed.

[0023] It can be seen that after entering the desiccant regeneration mode, initially, the first valve, the second valve, the fourth valve and the seventh valve are opened, and the other valves are closed. The drying filter is continuously heated by heat storage. When a certain temperature is reached and the heating is continued for a period of time, the seventh valve is closed and the sixth valve is opened. The compressor continuously draws a vacuum to discharge the moisture in the system and the drying filter, thereby achieving self-cleaning, which can greatly improve the service life of the drying filter.

[0024] A preferred solution is that a liquid level gauge is further provided on the recovery tank, a liquid refrigerant outlet is provided at the bottom of the recovery tank, and the position of the liquid level gauge is higher than the position of the liquid refrigerant outlet.

[0025] It can be seen that through precise control of the liquid level meter, non-condensable gases can be effectively prevented from entering the external recovery tank.

[0026] A further solution is that the refrigerant recovery and purification system also includes a refrigerant storage tank and a weighing device. The refrigerant storage tank is arranged on the weighing device. The refrigerant storage tank is connected to the liquid refrigerant outlet through a refrigerant outlet pipe. An eighth valve is provided on the refrigerant outlet pipe.

[0027] It can be seen from this that the refrigerant liquid level in the recovery tank can be detected by a liquid level gauge. When it reaches a certain liquid level, the liquid refrigerant can be poured into the refrigerant storage tank, which can effectively prevent non-condensable gases from entering the refrigerant storage tank.

[0028] A preferred solution is that a lubricating oil outlet is provided at the bottom of the distillation tank, and a ninth valve is provided at the lubricating oil outlet.

[0029] It can be seen that the refrigerant passes through the distillation tank, the refrigerant is heated and evaporated, and the lubricating oil remains at the bottom and can be discharged through the lubricating oil outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a system block diagram of an embodiment of the refrigerant recovery and purification system of the present utility model.

[0031] Figure 2 It is a schematic diagram of the refrigerant flow direction in the refrigerant recovery mode in an embodiment of the refrigerant recovery and purification system of the present utility model.

[0032] Figure 3 It is a schematic diagram of the refrigerant flow direction in the refrigerant circulation purification mode in an embodiment of the refrigerant recovery and purification system of the present utility model.

[0033] Figure 4 It is a schematic diagram of the refrigerant flow direction in the desiccant regeneration mode in an embodiment of the refrigerant recovery and purification system of the present utility model.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0036] The terms "first," "second," and similar expressions used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. The terms "include" or "comprising" and similar expressions mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In the present invention, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0038] All terms used in this utility model (including technical or scientific terms) have the same meaning as those understood by ordinary technicians in the relevant field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0040] See also Figure 1 The refrigerant recovery and purification system includes a refrigerant recovery device 10, an online refrigerant detection device 2, a filter dryer 3, a compressor 4, a condenser 5, a refrigerant recovery device 6, a heat storage device 71, a heating tube 72, a refrigerant storage tank 81, and a weighing device 82. The online refrigerant detection device 2 is used to detect indicators such as the moisture content and refrigerant purity in the refrigerant. The compressor 4 is an oil-free compressor. The heat storage device 71 is filled with a cold storage material, which can optionally include hydrated salts, fluorine-free liquid, paraffin, and other materials.

[0041] The refrigerant recovery and purification system further includes a refrigerant inlet pipe 11 , a recovery tank outlet pipe 12 , a distillation tank inlet pipe 13 , a first exhaust pipe 14 , a bypass line 15 and a second exhaust pipe 16 .

[0042] The refrigerant recovery device 6 includes a recovery tank 61, a distillation tank 62 and a refrigeration component 63. The distillation tank 62 is arranged near the recovery tank 61, and the distillation tank 62, the drying filter 3, the compressor 4, the condenser 5 and the recovery tank 61 are connected in sequence. The refrigeration component 63 is arranged between the distillation tank 62 and the recovery tank 61. The refrigeration component 63 is a semiconductor refrigeration plate, which has a cold end and a hot end. The cold end faces the recovery tank 61 and supplies cold energy to the recovery tank 61, and the hot end faces the distillation tank 62 and supplies heat to the distillation tank 62. In order to improve the cooling and heating effects, a cold end heat storage device 631 is provided at the cold end, and a hot end heat storage device 632 is provided at the hot end. Both the cold end heat storage device 631 and the hot end heat storage device 632 are filled with cold storage materials. Optionally, the cold storage materials can be materials such as hydrated salts, fluorine cold liquid, and paraffin.

[0043] The two ends of the refrigerant inlet pipe 11 are respectively connected to the refrigerant recovery device 10 and the distillation tank inlet pipe 13. The refrigerant online detection device 2 is arranged on the refrigerant inlet pipe 11. The refrigerant inlet pipe 11 is also provided with a tenth valve v10, a pressure sensor 111 and a temperature sensor 112. The tenth valve v10 is arranged on the refrigerant inlet pipe 11 at one end close to the refrigerant recovery device 10. The refrigerant online detection device 2 is arranged on the refrigerant inlet pipe 11 at one end close to the distillation tank inlet pipe 13. The pressure sensor 111 and the temperature sensor 112 are both located between the tenth valve v10 and the refrigerant online detection device 2.

[0044] Both ends of the recovery tank outlet pipe 12 are connected to the refrigerant inlet pipe 11 and the recovery tank 61 respectively, and the connection position between the recovery tank outlet pipe 12 and the refrigerant inlet pipe 11 is located at the inlet side of the refrigerant online detection device 2.

[0045] Both ends of the distillation tank inlet pipe 13 are respectively connected to the outlet side of the refrigerant online detection device 2 and the distillation tank 62 . A first valve v1 is provided on the recovery tank outlet pipe 12 , and a second valve v2 is provided on the distillation tank inlet pipe 13 .

[0046] A lubricating oil outlet 621 is provided at the bottom of the distillation tank 62 , and a ninth valve v9 is provided at the lubricating oil outlet 621 . When the refrigerant passes through the distillation tank 62 , the refrigerant is heated and evaporated, while the lubricating oil remains at the bottom and can be discharged through the lubricating oil outlet 621 .

[0047] The first exhaust pipe 14 is connected to the refrigerant inlet pipe 11 and is connected between the outlet of the refrigerant online detection device 2 and the second valve v2. A third valve v3 is provided on the first exhaust pipe 14. An external recovery tank can also be provided at the outlet of the first exhaust pipe 14 to store the exhausted gas.

[0048] Thermal storage device 71 is mounted on filter drier 3 and supplies heat to the filter drier 3. Heating pipe 72 also supplies heat to thermal storage device 71. Heating pipe 72 heats filter drier 3, thereby regenerating the desiccant. Thermal storage device 71 ensures a continuous supply of heat to filter drier 3, ensuring stable desiccant regeneration and enabling reuse.

[0049] A bypass line 15 is arranged in parallel with the condenser 5. A heating pipe 72 is located on and communicates with the bypass line 15. A fourth valve v4 is provided on the bypass line 15 and is located on the inlet side of the heating pipe 72. The compressor 4 is connected to the condenser 5 via a condensate inlet pipe 51. The bypass line 15 is connected to the condensate inlet pipe 51 at a first position A1. A fifth valve v5 is provided on the condensate inlet pipe 51 and is located between the condenser 5 and the first position A1.

[0050] The condenser 5 is connected to the recovery tank 61 through the condensate outlet pipe 52. A throttle valve 9 is provided on the condensate outlet pipe 52. The throttle valve 9 is a one-way throttle valve. The second exhaust pipe 16 is connected to the condensate outlet pipe 52 at the second position A2. The second position A2 is located between the throttle valve 9 and the recovery tank 61. A sixth valve v6 is provided on the second exhaust pipe 16. A seventh valve v7 is provided on the condensate outlet pipe 52, and the seventh valve v7 is located between the second position A2 and the recovery tank 61.

[0051] The recovery tank 61 is further provided with a liquid level gauge 611 . A liquid refrigerant outlet 612 is provided at the bottom of the recovery tank 61 . The position of the liquid level gauge 611 is higher than the position of the liquid refrigerant outlet 612 .

[0052] Refrigerant storage tank 81 is mounted on a weighing device 82 and communicates with liquid refrigerant outlet 612 via a refrigerant outlet pipe 83, which is equipped with an eighth valve v8. The refrigerant level in recovery tank 61 is monitored by a liquid level gauge 611. Once the level reaches a certain level, liquid refrigerant is pumped into refrigerant storage tank 81, effectively preventing non-condensable gases from entering refrigerant storage tank 81.

[0053] The refrigerant recovery and purification system of the utility model has a refrigerant recovery mode, a refrigerant circulation purification mode, a non-condensable gas removal purification mode, a refrigerant recovery mode to an external refrigerant storage tank mode and a desiccant regeneration mode.

[0054] If air or a different refrigerant than the recovered refrigerant is present in refrigerant storage tank 81 before use, the refrigerant recovery and purification system must be vacuumed before refrigerant recovery and purification to ensure the purity of the recovered refrigerant. This prevents contamination of the purified refrigerant by other refrigerants. If the refrigerant storage tank 81 contains the same type of refrigerant as the recovered refrigerant, vacuuming is not necessary. Before refrigerant recovery, the semiconductor cooling chip 63 is activated to pre-cool the recovery tank 61 and pre-heat the distillation tank 62.

[0055] See also Figure 2 In refrigerant recovery mode, refrigerant in the refrigerant unit 10 is recovered. The tenth valve v10, second valve v2, fifth valve v5, and seventh valve v7 are opened, and the remaining valves are closed. Refrigerant from the refrigerant unit 10 passes through the refrigerant inlet pipe 11 and the refrigerant online detection device 2 before entering the distillation tank 62. The refrigerant is heated and evaporated in the distillation tank 62. Lubricating oil remaining at the bottom of the distillation tank 62 can be discharged through the lubricating oil outlet 621. The evaporated refrigerant passes through the filter drier 3 and enters the compressor 4, where it is compressed into a high-temperature, high-pressure gaseous refrigerant. After being discharged from the compressor 4, the gaseous refrigerant enters the condenser 5, where it is condensed into a high-pressure liquid. It then passes through the throttle valve 9 and enters the recovery tank 61 for storage. Recovery is complete when the pressure in the refrigerant unit 10 is less than 10% of the initial pressure and no higher than atmospheric pressure.

[0056] Because recovery tank 61 is pre-cooled by semiconductor refrigeration plate 63, the recovery pressure of recovery tank 61 is greatly reduced, which not only improves recovery efficiency but also enhances system safety. The refrigerant online detection device 2 detects whether the refrigerant meets the requirements of moisture content, purity, and other indicators. If qualified, the process is terminated and the refrigerant circulation purification mode is not required. If unqualified, the refrigerant circulation purification mode is required.

[0057] See also Figure 3 In refrigerant circulation purification mode, the first valve v1, second valve v2, fifth valve v5, and seventh valve v7 are opened, and the remaining valves are closed. The refrigerant stored in the recovery tank 61 re-enters the circulation system through the recovery tank 61 outlet pipe, passes through the distillation tank 62 for further oil and acid removal, and then enters the drying filter 3 for further water removal. The refrigerant is then sucked into the oil-free compressor 4, compressed to increase temperature and pressure, discharged into the condenser 5 for cooling, and finally transported to the recovery tank 61, completing another round of circulation purification. If the refrigerant non-condensable gas content is consistently above the standard, but the moisture content is within the standard, the non-condensable gas removal purification process is performed.

[0058] Non-condensable gas purification mode: If the non-condensable gas content is still too high after several cycles of purification and the recovery tank 61 reaches a certain low temperature, the semiconductor refrigeration plate 63 continues to cool the tank. The first valve v1 and the third valve v3 are opened, and the remaining valves are closed. The refrigerant purity of the discharged refrigerant is tested by the refrigerant online detection device 2. When the purity is acceptable, the third valve v3 is closed.

[0059] Recycling mode to external refrigerant storage tank 81: When the refrigerant is tested and qualified, the eighth valve v8 is opened to pour the liquid refrigerant from the recovery tank 61 into the refrigerant storage tank 81. The liquid level meter 611 is used to ensure that the incoming refrigerant is liquid refrigerant. At the same time, the quality detection electronic scale serving as the weighing device 82 is used to ensure that the mass of the refrigerant in the storage tank during recycling should not exceed 80% of the nominal filling mass of the tank body.

[0060] After a certain amount of refrigerant has been recovered and purified, the dehydration effect of the filter drier 3 will be greatly reduced. By entering the desiccant regeneration mode, heating and vacuuming the filter drier 3 can reduce the moisture content therein and achieve the purpose of reuse.

[0061] See also Figure 4 After entering the desiccant regeneration mode, initially, the first valve v1, the second valve v2, the fourth valve v4, and the seventh valve v7 are opened, and the other valves are closed. The filter drier 3 is continuously heated by heat storage. When a certain temperature is reached and heating continues for a period of time, the seventh valve v7 is closed and the sixth valve v6 is opened. The compressor 4 continuously draws a vacuum to discharge the moisture in the system and the filter drier 3, thereby achieving self-cleaning and greatly extending the service life of the filter drier 3.

[0062] As can be seen from the above, the new refrigerant recovery device makes the recovery tank and the distillation tank into an integrated structure, and arranges a refrigeration component between the two. The cold end of the refrigeration component is used to cool the recovery tank, thereby reducing the pressure of the recovery tank, and the hot end of the refrigeration component is used to heat the distillation tank, thereby preventing the refrigerant from being too low in temperature due to continuous evaporation in the distillation tank, affecting the distillation effect. At the same time, the pressure at the compressor inlet is increased, and the pressure at the recovery end is reduced. The pressure difference can be increased, which will greatly improve the recovery rate. At the same time, the refrigerant recovery device has a simple structure, a small equipment size, and can greatly reduce costs.

[0063] In addition, the refrigerant recovery and purification system of the present invention utilizes a compression condensation method, distillation technology, and a high-efficiency drying filter to remove oil, water, acid, solid particles, and non-condensable gases due to differences in boiling points. It also has a self-purification function, which can utilize the heat of the compressor itself and the heat of semiconductor heating to dry and regenerate components, greatly reducing the replacement frequency of components such as the drying filter. During the circulation purification process, the cooling energy obtained by the refrigerant evaporation heat absorption during the system's circulation purification process and the cooling energy of semiconductor refrigeration are fully utilized to pre-cool the refrigerant. The recovered refrigerant containing a large amount of non-condensable gases is then discharged from the top using the boiling point difference. Using a liquid level gauge, the liquid refrigerant is then flushed into the recovery tank from the bottom, greatly reducing the content of non-condensable gases. By changing the flow path, the exhaust gas is used to heat the drying filter, while the compressor is vacuuming, which greatly extends the life of the drying filter, reduces material consumption, and lowers costs.

[0064] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A refrigerant recovery device, comprising a recovery tank, wherein the recovery tank is provided with a refrigeration recovery port, characterized in that: The refrigerant recovery device also includes a distillation tank and a refrigeration component; The distillation tank is arranged close to the recovery tank, the refrigeration component is arranged between the distillation tank and the recovery tank, and the refrigeration component is provided with a cold end and a hot end, the cold end is arranged toward the recovery tank and supplies cold energy to the recovery tank, and the hot end is arranged toward the distillation tank and supplies heat to the distillation tank; The distillation tank is provided with a distillation inlet and a distillation outlet.

2. The refrigerant recovery device according to claim 1, characterized in that: The recovery tank is further provided with a refrigeration cycle outlet, and the refrigeration cycle outlet is communicable with the distillation inlet.

3. Refrigerant recovery and purification system, including dry filter, compressor, condenser and refrigerant recovery device; Its characteristics are: The refrigerant recovery device includes a recovery tank, a distillation tank and a refrigeration component; The distillation tank is arranged close to the recovery tank, and the distillation tank, the drying filter, the compressor, the condenser and the recovery tank are connected in sequence; The refrigeration component is disposed between the distillation tank and the recovery tank. The refrigeration component is provided with a cold end and a hot end. The cold end faces the recovery tank and supplies cold energy to the recovery tank. The hot end faces the distillation tank and supplies heat to the distillation tank.

4. The refrigerant recovery and purification system according to claim 3, characterized in that: The refrigerant recovery and purification system also includes a refrigerant online detection device, a refrigerant inlet pipe, a recovery tank outlet pipe and a distillation tank inlet pipe; The refrigerant online detection device is arranged on the refrigerant inlet pipe, and the two ends of the recovery tank outlet pipe are respectively connected to the inlet side of the refrigerant online detection device and the recovery tank; The two ends of the distillation tank inlet pipe are respectively connected to the outlet side of the refrigerant online detection device and the distillation tank; The recovery tank outlet pipe is provided with a first valve, and the distillation tank inlet pipe is provided with a second valve; In the refrigerant recovery mode, the first valve is closed and the second valve is opened; In the refrigerant cycle purification mode, both the first valve and the second valve are open.

5. The refrigerant recovery and purification system according to claim 4, characterized in that: The refrigerant recovery and purification system further includes a first exhaust pipe; The first exhaust pipe is in communication with the refrigerant inlet pipe, and the first exhaust pipe is connected between the outlet of the refrigerant online detection device and the second valve; The first exhaust pipe is provided with a third valve.

6. The refrigerant recovery and purification system according to any one of claims 3 to 5, characterized in that: The refrigerant recovery and purification system further includes a heat storage device and a heating pipe. The heat storage device is disposed on the drying filter and supplies heat to the drying filter. The heating pipe supplies heat to the heat storage device.

7. The refrigerant recovery and purification system according to claim 6, characterized in that: The refrigerant recovery and purification system further includes a bypass pipeline, the bypass pipeline is arranged in parallel with the condenser, and the heating pipe is located on the bypass pipeline and communicated with the bypass pipeline; The bypass pipeline is provided with a fourth valve, and the fourth valve is located at the inlet side of the heating pipe; The compressor is connected to the condenser via a condenser inlet pipe, the bypass line is connected to the condenser inlet pipe at a first position, a fifth valve is provided on the condenser inlet pipe, and the fifth valve is located between the condenser and the first position; In the desiccant regeneration mode, the fourth valve is opened and the fifth valve is closed.

8. The refrigerant recovery and purification system according to any one of claims 3 to 5, characterized in that: The condenser is connected to the recovery tank via a condensate outlet pipe, and a throttle valve is provided on the condensate outlet pipe; The refrigerant recovery and purification system further includes a second exhaust pipe, a sixth valve and a seventh valve; The second exhaust pipe is connected to the condensation outlet pipe at a second position, and the second position is located between the throttle valve and the recovery tank; The sixth valve is provided on the second exhaust pipe, and the seventh valve is provided on the condensation outlet pipe and is located between the second position and the recovery tank; In the desiccant regeneration mode, the seventh valve is first opened for a preset time and then closed, and the sixth valve is opened while the seventh valve is closed.

9. The refrigerant recovery and purification system according to any one of claims 3 to 5, characterized in that: The recovery tank is also provided with a liquid level gauge. A liquid refrigerant outlet is provided at the bottom of the recovery tank. The position of the liquid level gauge is higher than the position of the liquid refrigerant outlet.

10. The refrigerant recovery and purification system according to claim 9, characterized in that: The refrigerant recovery and purification system also includes a refrigerant storage tank and a weighing device. The refrigerant storage tank is arranged on the weighing device. The refrigerant storage tank is connected to the liquid refrigerant outlet through a refrigerant outlet pipe. An eighth valve is provided on the refrigerant outlet pipe.

11. The refrigerant recovery and purification system according to any one of claims 3 to 5, characterized in that: A lubricating oil outlet is provided at the bottom of the distillation tank, and a ninth valve is provided at the lubricating oil outlet.

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