Refrigerant recovery device and air conditioner

Abstract

The utility model discloses a refrigerant recovery device and an air conditioner. The refrigerant recovery device comprises a compressor, a gas-liquid separator, a heating valve, a refrigerating valve and a refrigerant recovery valve, an air outlet of the gas-liquid separator is connected to the air suction end of the compressor, and the refrigerant recovery valve is connected to an air inlet of the gas-liquid separator; the first end of the heating valve is connected to the indoor heat exchanger, and the second end of the heating valve is connected to the exhaust end of the compressor. The first end of the refrigeration valve is connected to the outdoor heat exchanger; the second end of the refrigeration valve is connected to the exhaust end of the compressor; the first end of the heating valve and the first end of the refrigerating valve can communicate with the air suction end of the compressor through the gas-liquid separator. And when the refrigerant is recycled, the heating valve and the refrigerating valve are closed, and the refrigerant recycling valve is opened, so that the refrigerant is recycled to the gas-liquid separator. According to the utility model, the refrigerant can be recovered and limited in the gas-liquid separator, so that refrigerant leakage caused by the fact that the whole outdoor unit is filled with the refrigerant and is maintained or moved is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and more specifically, to a refrigerant recovery device and an air conditioner. Background Art

[0002] When an air conditioner operates, the refrigerant circulates between the indoor unit and the outdoor unit. When air conditioner components need to be replaced, repaired, or the air conditioner needs to be relocated, in order to avoid a large amount of refrigerant leaking into the air, the refrigerant needs to be recovered.

[0003] Currently, generally the refrigerant is recovered into the outdoor unit. Specifically, the air conditioner is controlled to operate in the cooling mode, the liquid pipe shut-off valve is closed, and the refrigerant in the indoor unit is discharged into the outdoor unit through the air pipe by the compressor. When the air conditioner is protected, the air pipe shut-off valve is closed to complete the refrigerant recovery. The recovered refrigerant is mainly concentrated in the outdoor heat exchanger. However, for some air conditioners with a small-capacity outdoor heat exchanger, the recovered refrigerant will fill the components and pipelines of the entire outdoor unit. When replacing or repairing components in the outdoor unit (such as the heating electronic expansion valve, subcooler electronic expansion valve, etc.), refrigerant leakage will still occur.

[0004] In view of the problem of how to optimize refrigerant recovery in the prior art, no effective solution has been proposed yet. Summary of the Utility Model

[0005] Embodiments of the utility model provide a refrigerant recovery device and an air conditioner to at least solve the problem of how to optimize refrigerant recovery in the prior art.

[0006] To solve the above technical problem, an embodiment of the utility model provides a refrigerant recovery device applied to an air conditioner, including: a compressor, a gas-liquid separator, a heating valve, a cooling valve, and a refrigerant recovery valve;

[0007] The air outlet of the gas-liquid separator is connected to the suction end of the compressor, and the refrigerant recovery valve is connected to the air inlet of the gas-liquid separator;

[0008] The first end of the heating valve is connected to the indoor heat exchanger, and the second end of the heating valve is connected to the discharge end of the compressor;

[0009] The first end of the cooling valve is connected to the outdoor heat exchanger, and the second end of the cooling valve is connected to the discharge end of the compressor;

[0010] The first ends of the heating valve and the cooling valve can both communicate with the suction end of the compressor through the gas-liquid separator;

[0011] When recovering the refrigerant, the heating valve and the cooling valve are closed, and the refrigerant recovery valve is opened to enable the refrigerant to be recovered into the gas-liquid separator.

[0012] Optionally, the refrigerant recovery valve is a normally open valve, and the refrigerant recovery valve is closed when the recovery end condition is met.

[0013] Optionally, the heating valve is opened in the heating mode and closed in the cooling mode, and the first end of the heating valve is communicated with the suction end of the compressor through the gas-liquid separator in the cooling mode.

[0014] Optionally, the cooling valve is opened in the cooling mode and closed in the heating mode, and the first end of the cooling valve is communicated with the suction end of the compressor through the gas-liquid separator in the heating mode.

[0015] Optionally, the refrigerant recovery device further includes: a three-way valve, the first end of the three-way valve is connected to the suction end of the compressor through the gas-liquid separator, the second end of the three-way valve is connected to the first end of the heating valve, and the third end of the three-way valve is connected to the first end of the cooling valve.

[0016] Optionally, the first end of the three-way valve is connected to the first end of the refrigerant recovery valve, and the second end of the refrigerant recovery valve is connected to the air inlet of the gas-liquid separator.

[0017] Optionally, the first end of the heating valve is connected to the indoor heat exchanger and the second end of the three-way valve through a first three-way pipe.

[0018] Optionally, the first end of the cooling valve is connected to the outdoor heat exchanger and the third end of the three-way valve through a second three-way pipe.

[0019] Optionally, the second ends of the heating valve and the cooling valve are connected to the exhaust end of the compressor through a third three-way pipe.

[0020] An embodiment of the present invention further provides an air conditioner, including: the refrigerant recovery device described in the embodiment of the present invention.

[0021] By applying the technical solution of the present invention, by setting the heating valve, the cooling valve and the refrigerant recovery valve, when recovering the refrigerant, the refrigerant can be recovered and restricted in the gas-liquid separator. Generally, the capacity of the gas-liquid separator is relatively large, so that the refrigerant recovery is relatively complete, and it is avoided that the refrigerant fills the entire outdoor unit, resulting in refrigerant leakage during maintenance or relocation. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the refrigerant recovery device provided by the embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the refrigerant flow direction in the cooling mode provided by the embodiment of the present invention;

[0024] Figure 3It is a schematic diagram of the refrigerant flow direction in the heating mode provided by the embodiments of the present utility model;

[0025] Figure 4 It is a flowchart of the refrigerant recovery control method provided by the embodiments of the present utility model;

[0026] Figure 5 It is a schematic diagram of the air conditioner provided by the embodiments of the present utility model;

[0027] Description of the reference numerals:

[0028] Compressor 1, gas-liquid separator 2, heating valve 3, refrigeration valve 4, refrigerant recovery valve 5, indoor heat exchanger 6, outdoor heat exchanger 7, three-way valve 8, heating electronic expansion valve 9, IPM heat dissipation module 10, subcooler 11, subcooler electronic expansion valve 12, subcooler solenoid valve 13, high-pressure sensor 14, low-pressure sensor 15, gas separation inlet pipe temperature sensor 16, gas separation outlet pipe temperature sensor 17, subcooled gas outlet temperature sensor 18, oil separator 19, oil return valve 20. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0032] It should be understood that the term "and / or" used herein is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0033] The optional embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] This embodiment provides a refrigerant recovery device, which is applied to an air conditioner. Figure 1 is a schematic diagram of the refrigerant recovery device provided by the embodiment of the present utility model, briefly showing the main components related to refrigerant recovery in the air conditioner and their connections, such as Figure 1 shown, the refrigerant recovery device includes: a compressor 1, a gas-liquid separator 2, a heating valve 3, a cooling valve 4, and a refrigerant recovery valve 5.

[0036] During the normal operation of the air conditioner, the refrigerant discharged from the compressor 1 enters the condenser for condensation, then undergoes throttling through a throttling element, and then enters the gas-liquid separator 2 after evaporation in the evaporator. The gas-liquid separator 2 is used to separate the incoming refrigerant into gas and liquid. The separated gaseous refrigerant returns to the suction end of the compressor, and the separated liquid refrigerant is stored in the gas-liquid separator 2 to avoid liquid slugging of the compressor.

[0037] The gas-liquid separator 2 includes an inlet and an outlet. The outlet of the gas-liquid separator 2 is connected to the suction end of the compressor, and the refrigerant recovery valve 5 is connected to the inlet of the gas-liquid separator 2.

[0038] The first end of the heating valve 3 is connected to the indoor heat exchanger 6, and the second end of the heating valve 3 is connected to the exhaust end of the compressor. The first end of the cooling valve 4 is connected to the outdoor heat exchanger 7, and the second end of the cooling valve 4 is connected to the exhaust end of the compressor. The first ends of the heating valve 3 and the cooling valve 4 can both be connected to the suction end of the compressor through the gas-liquid separator 2, and the first ends of the heating valve 3 and the cooling valve 4 are connected to the suction end of the compressor in different modes, that is, the first ends of the heating valve 3 and the cooling valve 4 are not connected to the suction end of the compressor simultaneously.

[0039] When recovering the refrigerant, the heating valve 3 and the cooling valve 4 are closed, and the refrigerant recovery valve 5 is opened so that the refrigerant is recovered into the gas-liquid separator 2. When recovering the refrigerant, the compressor 1 operates to provide suction power, and the heating valve 3 and the cooling valve 4 are closed to avoid the complete circulation of the refrigerant, and the refrigerant in the indoor unit and the outdoor unit is recovered. The recovered refrigerant is concentrated in the gas-liquid separator 2 and the pipeline between the gas-liquid separator 2 and the suction end of the compressor. That is, the recovered refrigerant is mainly stored in the gas-liquid separator 2, and there is no refrigerant in other components and pipelines in the outdoor unit, so there will be no refrigerant leakage during maintenance or relocation.

[0040] In this embodiment, by setting the heating valve 3, the cooling valve 4 and the refrigerant recovery valve 5, when recovering the refrigerant, the refrigerant can be recovered and restricted in the gas-liquid separator 2. The capacity of the gas-liquid separator 2 is generally large, so that the refrigerant recovery is relatively complete, and it is avoided that the refrigerant fills the entire outdoor unit, resulting in refrigerant leakage during maintenance or relocation.

[0041] Three-way pipes can be provided at both ends of the heating valve 3 and both ends of the cooling valve 4 for connection, refer to Figure 1 .

[0042] The refrigerant recovery valve 5 is a normally open valve to ensure the smooth circulation of the refrigerant during the normal operation of the air conditioner. When the recovery end condition is met, the refrigerant recovery valve 5 is closed, which can realize the cut-off function during refrigerant recovery and ensure that the refrigerant is recovered and restricted in the gas-liquid separator 2.

[0043] The heating valve 3, the cooling valve 4 and the refrigerant recovery valve 5 can be valve bodies with on-off control functions such as solenoid valves, electric ball valves, electronic expansion valves, etc.

[0044] Most air conditioners with heating and cooling functions use a four-way valve as the commutation component to realize the switching of different refrigerant flow directions in different modes. Using a four-way valve for commutation, only this one valve component is needed to realize the mode switching. However, in actual engineering applications, the completion of the commutation action of the four-way valve requires a specific refrigerant pressure, and in practice, the commutation is often unsuccessful, resulting in abnormal operation or even damage of the air conditioner. In addition, the four-way valve has a weak anti-interference ability to impurities and other foreign objects. During the long-term operation of the air conditioner, some worn impurities enter the four-way valve, often causing the slider inside the four-way valve to get stuck or unable to move to the designed position, resulting in internal leakage of the four-way valve, gas leakage protection, and damage to the air conditioner unit. In addition, the cost of the four-way valve is high and the maintenance cost is high.

[0045] In this embodiment, by controlling the heating valve 3, the cooling valve 4 and their connecting pipelines, the refrigerant flow direction can be switched to realize the switching between the cooling and heating modes. Specifically, the heating valve 3 is opened in the heating mode and closed in the cooling mode, and the first end of the heating valve 3 is connected to the compressor suction end through the gas-liquid separator 2 in the cooling mode. The cooling valve 4 is opened in the cooling mode and closed in the heating mode, and the first end of the cooling valve 4 is connected to the compressor suction end through the gas-liquid separator 2 in the heating mode.

[0046] That is to say, in the cooling mode, the refrigerant discharged from the compressor 1 flows through the cooling valve 4 to the outdoor heat exchanger 7 for condensation, and then throttles through the throttling element and enters the indoor heat exchanger 6 for evaporation. At this time, the first end of the heating valve 3 is connected to the compressor suction end. Therefore, the refrigerant flowing out of the indoor heat exchanger 6 flows to the gas-liquid separator 2 and returns to the compressor suction end. In the heating mode, the refrigerant discharged from the compressor 1 flows through the heating valve 3 to the indoor heat exchanger 6 for condensation, and then throttles through the throttling element and enters the outdoor heat exchanger 7 for evaporation. At this time, the first end of the cooling valve 4 is connected to the compressor suction end. Therefore, the refrigerant flowing out of the outdoor heat exchanger 7 flows to the gas-liquid separator 2 and returns to the compressor suction end.

[0047] The above refrigerant recovery device further includes: a three-way valve 8. The first end A of the three-way valve 8 is connected to the compressor suction end through the gas-liquid separator 2. The second end B of the three-way valve 8 is connected to the first end of the heating valve 3. The third end C of the three-way valve 8 is connected to the first end of the cooling valve 4. In this embodiment, through the three-way valve 8, with a simple and low-cost structure, the first end of the heating valve 3 and the first end of the cooling valve 4 are respectively connected to the compressor suction end.

[0048] In this embodiment, the heating valve 3, the cooling valve 4, the three-way valve 8 and their connecting pipelines form a new commutation component, which can achieve instant commutation without relying on the system pressure (that is, without adjusting the compressor to a certain frequency), the mode switching is faster, and it will not cause commutation failure due to relying on the system pressure, is not easy to get stuck, has higher operation reliability, and has a simple structure, low design and maintenance costs, and significant economic benefits. In addition, for the four-way valve in the prior art, whether it is powered off or on, there is always a port in the connected state. When recovering the refrigerant, the refrigerant can only be recovered into the entire outdoor unit. However, in this application, by closing the heating valve 3 and the cooling valve 4, the recovered refrigerant can be restricted in the gas-liquid separator 2.

[0049] Reference Figure 1 , the first end of the heating valve 3 can be connected to the indoor heat exchanger 6 and the second end B of the three-way valve 8 through the first three-way pipe. The first end of the cooling valve 4 can be connected to the outdoor heat exchanger 7 and the third end C of the three-way valve 8 through the second three-way pipe. The second end of the heating valve 3 and the second end of the cooling valve 4 can be connected to the compressor discharge end through the third three-way pipe. The connection is realized through the three-way pipe, with a simple and reliable structure and is easy to implement.

[0050] As Figure 2 shown, it is a schematic diagram of the refrigerant flow direction in the refrigeration mode. The first end A and the second end B of the three-way valve 8 are connected, and the first end A and the third end C are not connected (i.e., AB is connected and AC is not connected). The heating valve 3 is closed, and the refrigeration valve 4 is opened, so that the refrigerant discharged from the compressor 1 flows through the refrigeration valve 4 to the outdoor heat exchanger 7 for condensation, and then enters the indoor heat exchanger 6 for evaporation after throttling through the throttling element. The refrigerant flowing out of the indoor heat exchanger 6 flows through the three-way valve 8 to the gas-liquid separator 2 and returns to the compressor suction end.

[0051] The refrigerant flow directions in the oil return mode and the defrosting mode are the same as those in the refrigeration mode, and the control of the commutation assembly is also executed according to the refrigeration mode, which can achieve rapid defrosting and rapid oil return, avoiding the problem that the existing four-way valve has a large dependence on the system pressure during commutation, the compressor needs to reduce the frequency, resulting in a reduction in comfort, and the inability to achieve rapid defrosting and rapid oil return due to the long time-consuming of frequency reduction.

[0052] As Figure 3 shown, it is a schematic diagram of the refrigerant flow direction in the heating mode. The first end A and the third end C of the three-way valve 8 are connected, and the first end A and the second end B are not connected (i.e., AC is connected and AB is not connected). The refrigeration valve 4 is closed, and the heating valve 3 is opened, so that the refrigerant discharged from the compressor 1 flows through the heating valve 3 to the indoor heat exchanger 6 for condensation, and then enters the outdoor heat exchanger 7 for evaporation after throttling through the throttling element. Moreover, the refrigerant flowing out of the outdoor heat exchanger 7 flows through the three-way valve 8 to the gas-liquid separator 2 and returns to the compressor suction end.

[0053] The first end of the three-way valve 8 is connected to the first end of the refrigerant recovery valve 5, and the second end of the refrigerant recovery valve 5 is connected to the air inlet of the gas-liquid separator 2. The setting position of the refrigerant recovery valve 5 in this embodiment can better limit the recovered refrigerant in the gas-liquid separator 2.

[0054] Embodiment 2

[0055] This embodiment provides an air conditioner, including: the refrigerant recovery device described in the above embodiment.

[0056] By setting the heating valve 3, the refrigeration valve 4 and the refrigerant recovery valve 5, the air conditioner in this embodiment can recover and limit the refrigerant in the gas-liquid separator 2 when recovering the refrigerant. The capacity of the gas-liquid separator 2 is generally large, so that the refrigerant recovery is relatively complete, and it can avoid refrigerant leakage during maintenance or relocation due to the refrigerant filling the entire outdoor unit.

[0057] Embodiment 3

[0058] This embodiment provides a refrigerant recovery control method, which is applied to the refrigerant recovery device described in the above embodiment. Figure 4 It is a flowchart of the refrigerant recovery control method provided by the embodiment of the present invention. AsFigure 4 As shown, the method includes the following steps:

[0059] S401: In response to a refrigerant recovery instruction, control the compressor 1 to operate, close the heating valve 3 and the refrigeration valve 4, and open the refrigerant recovery valve 5.

[0060] S402: When the recovery end condition is met, close the compressor 1 and the refrigerant recovery valve 5 to recover the refrigerant into the gas-liquid separator 2.

[0061] In this embodiment, by controlling the heating valve 3, the refrigeration valve 4, and the refrigerant recovery valve 5, when recovering the refrigerant, the refrigerant can be recovered and restricted within the gas-liquid separator 2. The capacity of the gas-liquid separator 2 is generally large, enabling more complete refrigerant recovery and avoiding refrigerant leakage during maintenance or relocation due to the refrigerant filling the entire outdoor unit.

[0062] The above-mentioned recovery end condition can be: the air conditioner is protected or the preset recovery time is reached. Among them, the preset recovery time can be set according to the actual situation. For example, the preset recovery time is set to an empirical value of 5 to 8 minutes. In this embodiment, when recovering the refrigerant, the compressor provides suction power, closes the heating valve 3 and the refrigeration valve 4, avoids the complete circulation of the refrigerant, and thus recovers the refrigerant into the gas-liquid separator 2. When the air conditioner operates for a period of time or experiences exhaust protection / high-pressure protection, it is necessary to stop recovering the refrigerant and close the refrigerant recovery valve 5 to complete the refrigerant recovery.

[0063] In one embodiment, in response to a refrigeration instruction, a defrosting instruction, or an oil return instruction, control the first end of the three-way valve 8 to communicate with the second end of the three-way valve 8 and the first end of the three-way valve 8 not to communicate with the third end of the three-way valve 8, close the heating valve 3, and open the refrigeration valve 4, so that the refrigerant discharged from the compressor 1 flows through the refrigeration valve 4 to the outdoor heat exchanger 7, and the refrigerant flowing out of the indoor heat exchanger 6 flows through the three-way valve 8 to the compressor suction end.

[0064] In this embodiment, by controlling the heating valve 3, the refrigeration valve 4, and the three-way valve 8, the refrigerant flow direction for refrigeration can be quickly switched. Closing the heating valve 3 can prevent refrigerant bypass and gas leakage. For oil return and defrosting, there is no need to reduce the compressor frequency, and the mode can be quickly switched directly through the on-off of the valve body, thus achieving rapid defrosting and rapid oil return, avoiding the problems of high dependence on system pressure during the commutation of the existing four-way valve, the need to reduce the compressor frequency, which affects comfort, and the inability to achieve rapid defrosting and rapid oil return due to the long time required for frequency reduction, and ensuring the reliability of air conditioner operation.

[0065] In one embodiment, in response to a heating instruction, the first end of the three-way valve 8 is communicated with the third end of the three-way valve 8 and the first end of the three-way valve 8 is not communicated with the second end of the three-way valve 8, the refrigeration valve 4 is closed, and the heating valve 3 is opened, so that the refrigerant discharged by the compressor 1 flows through the heating valve 3 to the indoor heat exchanger 6, and the refrigerant flowing out of the outdoor heat exchanger 7 flows through the three-way valve 8 to the compressor suction end.

[0066] In this embodiment, by controlling the heating valve 3, the refrigeration valve 4 and the three-way valve 8, the refrigerant flow direction for heating can be quickly switched. Closing the refrigeration valve 4 can prevent refrigerant bypass and gas leakage, ensuring the reliability of air conditioner operation.

[0067] Table 1 Valve on-off control in refrigeration and heating modes

[0068]

[0069] As Figure 5 shown, it is a schematic diagram of an air conditioner, and the operation of the air conditioner in different modes is as follows:

[0070] (1) Refrigeration mode

[0071] When the air conditioner receives a refrigeration instruction, the valve bodies in the commutation assembly (i.e., the heating valve 3, the refrigeration valve 4 and the three-way valve 8) act according to Table 1 above. During refrigeration, the three-way valve 8 is in a power-off state, that is, the A end of the three-way valve 8 is conducted with the B end, and the A end is cut off from the C end. The refrigeration valve 4 is opened, and the heating valve 3 is closed.

[0072] The refrigerant discharged by the compressor 1 enters the outdoor heat exchanger 7 through the refrigeration valve 4 for condensation. The condensed liquid refrigerant enters the indoor heat exchanger 6 through the liquid pipe for evaporation. The evaporated refrigerant flows into the B end of the three-way valve 8 through the gas pipe, and then flows from the A end of the three-way valve 8 to the suction pipe side, and returns to the compressor 1 through the gas-liquid separator 2 for recompression. During this period, the heating valve 3 remains closed to prevent refrigerant bypass and gas leakage.

[0073] (2) Heating mode

[0074] When the air conditioner receives a heating instruction, the valve bodies in the commutation assembly act according to Table 1 above. During heating, the three-way valve 8 is in a powered-on state, that is, the A end of the three-way valve 8 is conducted with the C end, and the A end is cut off from the B end. The refrigeration valve 4 is closed, and the heating valve 3 is opened.

[0075] The refrigerant discharged by the compressor 1 enters the indoor heat exchanger 6 through the heating valve 3 and the gas pipe between the indoor and outdoor units for condensation. The condensed refrigerant flows out of the indoor heat exchanger 6, enters the outdoor heat exchanger 7 through the liquid pipe for evaporation. The evaporated refrigerant flows into the C end of the three-way valve 8, flows from the A end to the suction pipe side, and returns to the compressor 1 through the gas-liquid separator 2 for recompression. During this period, the refrigeration valve 4 remains closed to prevent refrigerant bypass and gas leakage.

[0076] (3) Oil return mode and defrosting mode

[0077] In the oil return mode and defrosting mode, the valve body in the commutation assembly is controlled according to the refrigeration mode. For oil return and defrosting, there is no need to reduce the compressor frequency, and the mode switching can be directly achieved through the on-off of the valve body.

[0078] (4) Refrigerant recovery mode

[0079] When the components of the air conditioner need to be replaced, repaired or relocated, refrigerant recovery is required, and the refrigerant is recovered into the gas-liquid separator 2.

[0080] In the refrigerant recovery mode, the compressor 1 starts to run, and the heating valve 3 and the refrigeration valve 4 are closed through the main board. When the air conditioner unit runs for a period of time (empirical value: 5 - 8 minutes) or the unit has a protection (such as exhaust protection, high-pressure protection, etc.), the unit automatically closes the refrigerant recovery valve 5 (normally open valve, only closes when the refrigerant recovery is completed), and the refrigerant recovery is completed.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigerant recovery device, applied to air conditioners, characterized in that: include: Compressor, gas-liquid separator, heating valve, cooling valve and refrigerant recovery valve; The gas outlet of the gas-liquid separator is connected to the air suction end of the compressor, and the refrigerant recovery valve is connected to the gas inlet of the gas-liquid separator; The first end of the heating valve is connected to the indoor heat exchanger, and the second end of the heating valve is connected to the exhaust end of the compressor; The first end of the refrigeration valve is connected to the outdoor heat exchanger, and the second end of the refrigeration valve is connected to the exhaust end of the compressor; The first end of the heating valve and the first end of the cooling valve can be connected to the suction end of the compressor through the gas-liquid separator; When recovering the refrigerant, the heating valve and the cooling valve are closed, and the refrigerant recovery valve is opened to recover the refrigerant to the gas-liquid separator.

2. The refrigerant recovery device according to claim 1, characterized in that: The refrigerant recovery valve is a normally open valve, and is closed when the recovery end condition is met.

3. The refrigerant recovery device according to claim 1, characterized in that: The heating valve is opened in the heating mode and closed in the cooling mode, and the first end of the heating valve is connected to the suction end of the compressor through the gas-liquid separator in the cooling mode.

4. The refrigerant recovery device according to claim 1, characterized in that: The refrigeration valve is opened in the cooling mode and closed in the heating mode, and the first end of the refrigeration valve is connected to the suction end of the compressor through the gas-liquid separator in the heating mode.

5. The refrigerant recovery device according to claim 1, characterized in that: Also includes: A three-way valve, wherein the first end of the three-way valve is connected to the suction end of the compressor through the gas-liquid separator, the second end of the three-way valve is connected to the first end of the heating valve, and the third end of the three-way valve is connected to the first end of the cooling valve.

6. The refrigerant recovery device according to claim 5, characterized in that: The first end of the three-way valve is connected to the first end of the refrigerant recovery valve, and the second end of the refrigerant recovery valve is connected to the air inlet of the gas-liquid separator.

7. The refrigerant recovery device according to claim 5, characterized in that: The first end of the heating valve is connected to the indoor heat exchanger and the second end of the three-way valve through a first three-way pipe.

8. The refrigerant recovery device according to claim 5, characterized in that: The first end of the refrigeration valve is connected to the outdoor heat exchanger and the third end of the three-way valve through a second three-way pipe.

9. The refrigerant recovery device according to claim 1, characterized in that: The second end of the heating valve and the second end of the cooling valve are connected to the exhaust end of the compressor through a third three-way pipe.

10. An air conditioner, characterized in that: include: The refrigerant recovery device according to any one of claims 1 to 9.

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