Liquid separator, compressor and multi-split air conditioning system

Abstract

The utility model provides a dispenser, compressor and multi-split air-conditioning system, dispenser comprises a dispensing tank and an oil return pipe, the lower end of dispensing tank is provided with an oil return port, at least part of the oil return pipe is wound and welded on the outer wall surface of dispensing tank, the inlet of the oil return pipe leads to the oil return port, and the outlet of the oil return pipe leads to the oil return port. The technical problem that in the prior art, when a capillary tube used for oil return is independently arranged, the capillary tube is overburnt can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and particularly relates to a liquid distributor, a compressor and a multi-connected air-conditioning system. Background Art

[0002] In the design system of multi-connected units, a single outdoor unit often matches multiple indoor units, and the installation involves multiple rooms and floors, with long connecting pipes, many elbows and large height differences. Most of the existing oil return structures of multi-connected units adopt an oil separator and an oil return pipe structure, and the separated lubricating oil is concentrated at the lower part of the oil separator, and then discharged through the oil return capillary in the externally connected oil return structure. The oil return port is arranged at the front end of the compressor suction pipe, and the oil return pipe mostly adopts a capillary tube. One end of the capillary tube is connected to the compressor suction pipe, and the other end is connected with a solenoid valve or a temperature control device. The oil return amount of this compressor is greatly affected by the layout and length of the compressor suction pipe. Since the oil return capillary is slender, it is prone to overheating, and the resistance of the oil return capillary is too small, and the stress is large, so it is easy to cause a high oil return temperature and the welded part of the capillary is easy to break.

[0003] How to avoid the phenomenon of overheating of the oil return pipe is a technical problem that needs to be solved at present. Summary of the Utility Model

[0004] Therefore, the utility model provides a liquid distributor, a compressor and a multi-connected air-conditioning system, which can solve the technical problem of overheating of the capillary tube caused by separately arranging a capillary tube for oil return in the prior art.

[0005] On the one hand, the utility model provides a liquid distributor, which includes a liquid separation tank and an oil return pipe. A oil return port is arranged at the lower end of the liquid separation tank, and at least part of the oil return pipe is wound and welded on the outer wall surface of the liquid separation tank, and the inlet of the oil return pipe leads to the oil return port.

[0006] In some embodiments, the oil return pipe includes an oil inlet section, the oil inlet section is communicated with the oil return port and welded and fixed on the liquid separation tank; the oil return pipe includes an oil outlet section, and the oil outlet section is welded and fixed on the liquid separation tank;

[0007] The oil inlet section is communicated with the oil outlet section through a damping section, and the outer diameters of the oil inlet section and the oil outlet section are both larger than the outer diameter of the damping section.

[0008] In some embodiments, the outer wall surface of the liquid separation tank includes a cylindrical outer wall surface, the oil outlet section is fixed at the upper end of the liquid separation tank, and the damping section is spirally wound on the cylindrical outer wall surface of the liquid separation tank.

[0009] In some embodiments, the damping section is wound on the outer wall surface of the liquid separation tank along the axial direction of the liquid separation tank.

[0010] In some embodiments, the damping section is a capillary tube.

[0011] In some embodiments, an inlet pipe is provided on the liquid separation tank. The inlet pipe includes an air inlet section inserted into the liquid separation tank, and the air inlet section is a straight section; the inner surface of the liquid separation tank includes a cylindrical inner wall surface, and the air inlet section extends along the tangential direction of the cylindrical inner wall surface.

[0012] In some embodiments, the outer wall of the liquid separation tank is covered with a protective rubber sleeve, and the protective rubber sleeve covers at least part of the oil return pipe.

[0013] In some embodiments, a coating is provided on the outer wall of the liquid separation tank, and the coating covers at least part of the oil return pipe.

[0014] In some embodiments, the oil return pipe is controlled to be opened and closed by an oil return solenoid valve that controls the on-off of the oil return pipe. The liquid separator further includes a temperature sensing device, and the oil return solenoid valve is opened or closed according to the temperature detected by the temperature sensing device.

[0015] On the other hand, the present invention also provides an air conditioner, including a compressor and the liquid separator described above; the oil-gas mixture discharged from the compressor flows into the liquid separator.

[0016] By winding and welding at least part of the oil return pipe to the outer wall of the liquid separation tank, the present invention improves the firmness of the oil return pipe. Since the oil return pipe is wound around the outer wall of the liquid separation tank, the liquid separation tank has a supporting effect on the oil return pipe. During welding, the size of a single welding point does not need to be large, and at the same time, a plurality of welding points are arranged along the length direction of the oil return pipe, which avoids the phenomenon of overheating during the welding of the oil return pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0018] Figure 1 is the front view cross-sectional view of the liquid separator of the embodiment of the present invention after removing the protective rubber sleeve;

[0019] Figure 2 is the front view of the liquid separator of the embodiment of the present invention with only the protective rubber sleeve sectioned;

[0020] Figure 3 is the Figure 1 top view partial cross-sectional view of the embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram when the oil return pipe of the embodiment of the present utility model winds around the axial direction of the liquid separation tank;

[0022] Figure 5 It is a schematic diagram of the air conditioner system of the embodiment of the present utility model;

[0023] The reference numerals are as follows:

[0024] 1. Liquid separation tank; 101. Air inlet pipe; 102. Air outlet pipe; 1011. Straight section; 1012. Connection section; 1013. Transition section; 103. Oil return port; 2. Oil return pipe; 201. Oil inlet section; 202. Damping section; 203. Oil outlet section; 204. Filter element; 205. Oil return temperature sensor; 206. Oil return solenoid valve; 3. Protective rubber sleeve; 401. Electronic expansion valve; 402. Small valve; 403. Large valve; 5. Compressor; 501. Four-way valve; 502. Filter; 503. Main valve; 504. Subcooler; 6. Oil-gas separator; 701. Exhaust temperature sensor; 702. Condenser inlet temperature sensor; 703. Condenser outlet temperature sensor; 704. Subcooler liquid outlet temperature sensor; 705. Subcooler gas outlet temperature sensor; 706. Gas separator inlet temperature sensor; 707. Gas separator outlet temperature sensor; 708. Ambient temperature sensor; 709. Defrosting temperature sensor; 801. Low-pressure sensor; 802. High-pressure switch; 803. High-pressure sensor; 9. Condenser; 901. Fan. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restrictive of the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0027] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figures and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures for the device. For example, if the device in the attached drawing is inverted, a device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0028] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0029] The present utility model provides a liquid distributor, a compressor and a multi-connected air-conditioning system thereof, which can solve the technical problem of overheating of a capillary tube caused by separately arranging a capillary tube for oil return in the prior art.

[0030] Referring to Figures 1-5 As shown, a liquid distributor includes a liquid separation tank 1 and an oil return pipe 2. An oil return port 103 is provided at the lower end of the liquid separation tank 1. At least part of the oil return pipe 2 is wound and welded on the outer wall surface of the liquid separation tank 1, and the inlet of the oil return pipe 2 leads to the oil return port 103.

[0031] By winding and welding at least part of the oil return pipe 2 on the outer wall surface of the liquid separation tank 1, the firmness of the oil return pipe 2 is improved. Since the oil return pipe 2 is wound on the outer wall surface of the liquid separation tank 1, the liquid separation tank 1 has a supporting effect on the oil return pipe 2. During welding, the size of a single welding point does not need to be large, and at the same time, a plurality of welding points are arranged along the length direction of the oil return pipe 2, which avoids the overheating phenomenon during the welding process of the oil return pipe 2. The lower end of the liquid separation tank 1 refers to, in the working state of the liquid separation tank 1, that is, in the vertical state, from the lowest point of the liquid separation tank 1 upwards to 1 / 3 of the overall height of the liquid separation tank 1, as Figure 1 shown. For example, if the total height of the liquid separation tank 1 is H, then the lower end is between the lowest point and 1 / 3H. Similarly, the upper end of the liquid separation tank 1 refers to between 2 / 3H to the highest point, that is, from the highest point of the liquid separation tank 1 downwards to 2 / 3 of the overall height of the liquid separation tank 1.

[0032] The return oil pipe 2 is made of the same material as the liquid separation tank 1, such as steel plates of the same specification, which is convenient for reducing the welding difficulty.

[0033] Preferably, as Figures 1-3 shown, the return oil pipe 2 includes an oil inlet section 201, and the oil inlet section 201 is communicated with the oil return port 103 and fixedly welded on the liquid separation tank 1; the return oil pipe 2 includes an oil outlet section 203, and the oil outlet section 203 is fixedly welded on the liquid separation tank 1;

[0034] The oil inlet section 201 is communicated with the oil outlet section 203 through a damping section 202, and the outer diameters of the oil inlet section 201 and the oil outlet section 203 are both larger than the outer diameter of the damping section 202.

[0035] The return oil pipe 2 includes an oil inlet section 201 and an oil outlet section 203. The two ends of the return oil pipe 2 (that is, the oil inlet section 201 and the oil outlet section 203) are subjected to greater fluid forces. The outer diameters of the oil inlet section 201 and the oil outlet section 203 are both larger than the outer diameter of the damping section 202, which is convenient for welding and fixing the return oil pipe 2, avoiding overheating phenomenon, and improving the fixing firmness of the return oil pipe 2. The damping section 202 between the oil inlet section 201 and the oil outlet section 203 is used to generate a damping effect on the fluid (lubricating oil) in the return oil pipe 2, reducing the flow rate of the lubricating oil. The welding and fixing of the damping section 202 has a smaller welding point compared with the welding and fixing of the oil inlet section 201 and the oil outlet section 203, and will not cause overheating of the damping section 202.

[0036] Preferably, as Figures 1-3 shown, the outer wall surface of the liquid separation tank 1 includes a cylindrical outer wall surface. The oil outlet section 203 is fixed at the upper end of the liquid separation tank 1, and the damping section 202 is spirally wound around the cylindrical outer wall surface of the liquid separation tank 1.

[0037] By making the outer wall surface of the liquid separation tank 1 include a cylindrical outer wall surface, since the oil outlet section 203 is fixed at the upper end of the liquid separation tank 1, this enables the damping section 202 to be spirally wound around the outer wall surface of the liquid separation tank 1; in this way, the damping section 202 can be evenly wound, avoiding bending mutations, so that the fluid flows smoothly in the damping section 202, the damping change is constant, the impact on the damping section 202 is small, the vibration is reduced, and the fixing strength of the damping section 202 is correspondingly enhanced.

[0038] Furthermore, the spiral damping section 202 is evenly wound, that is, the pitch is the same. Further reducing the flow mutation of the fluid in the damping section 202.

[0039] Preferably, as Figures 1-3 shown, the damping section 202 is wound around the outer wall surface of the liquid separation tank 1 along the axial direction of the liquid separation tank 1.

[0040] As Figure 4 shown, by winding and fixing the damping section 202 in this way, the overall length of the damping section 202 can be made longer. When maintaining a certain damping, the inner diameter of the damping section 202 can be made larger, which can avoid the damping section 202 from being blocked by impurities.

[0041] Preferably, as Figures 1-3 shown, the damping section 202 is a capillary tube.

[0042] The inner diameter of the capillary tube can be set to 1 mm, and the outer diameter is set to 2.3 mm. The length of the oil return pipe 2 is about 1000 mm; effectively ensuring the resistance of the damping section 202 to the fluid and avoiding the fluid (lubricating oil) from entering the compressor 5 too quickly and in large quantities.

[0043] To avoid the damping section 202 from being blocked by impurities, a filter element 204 can be provided in the oil inlet section 201 to filter the separated lubricating oil and avoid blocking the capillary tube.

[0044] Preferably, as Figures 1-3 shown, an air inlet pipe 101 is provided on the separation tank 1. The air inlet pipe 101 includes an air inlet section inserted into the separation tank 1, and the air inlet section is a straight section 1011; the inner surface of the separation tank 1 includes a cylindrical inner wall surface, and the air inlet section extends along the tangential direction of the cylindrical inner wall surface.

[0045] The oil-gas mixture enters the separation tank 1 from the air inlet pipe 101. Since the straight section 1011 of the air inlet pipe 101 extends along the tangential direction of the cylindrical inner wall surface, the oil-gas mixture can move in a circular motion along the cylindrical inner wall surface when entering the separation tank 1, reducing the impact of the oil-gas mixture on the separation tank 1 and reducing noise and vibration. During the process of the oil-gas mixture moving in a circular motion along the cylindrical inner wall surface, the gravity of the oil droplets and the gas is different. When the mixture moves in a circular motion, the oil droplets move outward under the action of centrifugal force and collide with the inner wall surface and adhere to the inner wall surface of the separation tank 1, and flow downward under the action of gravity and gather at the bottom of the separation tank 1.

[0046] Furthermore, to ensure that the gas can be discharged smoothly and avoid insufficient separation of the oil-gas mixture entering the separation tank 1, the exhaust pipe can be provided at the top of the separation tank 1, and the air inlet pipe 101 is provided on the annular side wall of the separation tank 1. In the height direction, there is a certain distance between the air outlet of the air inlet pipe 101 and the air inlet of the exhaust pipe. In this way, it is avoided that the oil-gas mixture entering the separation tank 1 directly discharges from the exhaust pipe. The gas after oil-gas separation flows upward and discharges from the exhaust pipe.

[0047] The intake pipe 101 can be set in an L shape. One section is the intake section, which extends along the tangential direction of the inner wall surface of the cylinder, and the other section is the connection section 1012, which extends along the axial direction of the inner wall surface of the cylinder. The intake section and the connection section 1012 are connected through a transition section 1013, and the connection section 1012 is used for connection. As Figure 3 shown, the minimum distance L between the connection section 1012 and the outer surface of the liquid separation tank 1 is not greater than 70 mm, which not only ensures the connection space between the connection section 1012 and the external gas flow pipe, but also reduces the vibration of the liquid separation tank 1 caused by the impact force of the mixed gas when flowing from the connection section 1012 to the intake section in the intake pipe 101.

[0048] Preferably, as Figure 2 shown, the outer wall of the liquid separation tank 1 is covered with a protective rubber sleeve 3, and the protective rubber sleeve 3 covers at least part of the oil return pipe 2.

[0049] By setting the protective rubber sleeve 3, the oil return pipe 2 is effectively protected. The at least part of the oil return pipe 2 mentioned here refers to the part of the oil return pipe 2 except the part inserted into the liquid separation tank 1. The protective rubber sleeve 3 not only protects the oil return pipe 2 during transportation, but also has the functions of vibration reduction and noise elimination during use.

[0050] Preferably, a coating is provided on the outer wall surface of the liquid separation tank 1, and the coating covers at least part of the oil return pipe 2.

[0051] The at least part of the oil return pipe 2 refers to the part except the part inserted into the liquid separation tank 1. By setting the coating, the corrosion of the liquid separation tank 1 and the oil return pipe 2 is effectively avoided, and the service life of the liquid separation tank 1 is improved. When the protective rubber sleeve 3 is provided, the coating is applied first, and then the protective rubber sleeve 3 is wrapped.

[0052] Preferably, as Figure 5 shown, the oil return pipe 2 is controlled by an oil return solenoid valve 206 that controls the on-off of the oil return pipe 2. The liquid separator further includes a temperature sensing device, and the oil return solenoid valve 206 is opened or closed according to the temperature detected by the temperature sensing device.

[0053] Specifically, the temperature sensing device may include multiple temperature sensing packages, which can detect the exhaust temperature, the oil return temperature, and the superheat degree, etc. Through multiple temperature sensing packages, precise control of the oil return is achieved. The oil return control valve is not provided on the oil return pipe 2, but on the oil return channel between the oil return pipe 2 and the compressor 5, that is, on the channel after damping, pressure reduction, and speed reduction. The diameter of the oil return pipe 2 is small and it is welded to the outer wall surface of the liquid separation tank 1, which is not conducive to setting the oil return solenoid valve 206.

[0054] The present invention provides an air conditioner, which includes a compressor 5 and the liquid separator described above; the oil-gas mixture discharged from the compressor 5 flows into the liquid separator.

[0055] The air conditioner may be a variable-frequency multi-connected unit system. Compared with the prior art, the multi-connected unit air-conditioning system of the present application does not need to separately provide an oil return structure such as an oil return capillary tube. Instead, in the process of manufacturing the liquid separator 1, the oil return pipe 2 is welded and fixed to the liquid separator 1, and correspondingly, there is no need to assemble the oil return pipe 2 subsequently. After the liquid separator 1 is manufactured, the oil return pipe 2 of the present application can be welded to the liquid separator 1, thus improving the production efficiency and making the overall structure more concise and firm. When the liquid distributor is applied to the air conditioner, the oil-gas mixture entering the liquid separator 1 mainly includes refrigerant, lubricating oil and very few impurities.

[0056] Such as Figure 5As shown, in the air conditioning system, there is a four-way valve 501 for commutation, an oil return solenoid valve 206 for controlling oil return, and a compressor 5 for compressing the refrigerant. The compressor 5 has an exhaust port and a suction port. Taking the refrigeration of the air conditioning system as an example, the refrigerant and lubricating oil mixture discharged from the exhaust port of the compressor 5 first flows through the liquid separator, where oil-gas separation is carried out. The lubricating oil flows back to the compressor 5 through the oil return pipe 2, and the refrigerant is discharged from the exhaust pipe and enters the four-way valve 501. The four-way valve 501 has an inlet D and three outlets C, S, and E. Among them, the outlet C is connected to the inlet of the condenser 9. After the refrigerant flows out from the outlet of the condenser 9, it sequentially flows through the filter 502, the main valve 503, the subcooler 504, the small valve 402, the indoor side, the large valve 403, the outlet E, the outlet S, and then enters the oil-gas separator 6, where further oil-gas separation is carried out. The separated lubricating oil and refrigerant flow back to the compressor 5. Among them, most of the refrigerant flows into the subcooler 504. Before a small part of the refrigerant flows into the subcooler 504, it flows into the heat exchange branch pipe. The heat exchange branch pipe is thermally coupled with the subcooler 504. An electronic expansion valve 401 (EXV) is provided on the heat exchange branch pipe. After the part of the refrigerant flows through the electronic expansion valve 401, its temperature is further reduced. This part of the refrigerant exchanges heat with most of the refrigerant in the subcooler 504. The temperature of the refrigerant in the heat exchange branch pipe increases, but it is still lower than the temperature of the refrigerant flowing out from the indoor side. The refrigerant in the heat exchange branch pipe is mixed with the refrigerant flowing out from the outlet S and then flows into the oil-gas separator 6. An exhaust temperature sensor 701 is provided on the discharge pipe of the compressor 5, a condenser inlet temperature sensor 702 is provided on the inlet pipe of the condenser 9, a condenser outlet temperature sensor 703 is provided on the outlet pipe of the condenser 9, and a subcooler liquid outlet temperature sensor 704 is provided on the outlet pipe of the subcooler 504. In the direction of refrigerant flow, a subcooler gas outlet temperature sensor 705 is provided on the heat exchange branch pipe downstream of the subcooler 504, a gas separator inlet temperature sensor 706 is provided on the inlet pipe of the oil-gas separator 6, and a gas separator outlet temperature sensor 707 and a low-pressure sensor 801 are provided on the outlet pipe of the oil-gas separator 6. An oil return solenoid valve 206 and an oil return temperature sensor 205 are provided on the oil return passage. A fan 901, an ambient temperature sensor 708, and a defrost temperature sensor 709 are provided at the condenser 9. A high-pressure switch 802 is provided on the liquid separator, and a high-pressure sensor 803 is provided on the outlet pipe 102 of the liquid separator.

[0057] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0058] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present utility model.

Claims

1. A liquid distributor, comprising a liquid distributor tank (1) and an oil return pipe (2), characterized in that: The lower end of the liquid separation tank (1) is provided with an oil return port (103), at least a portion of the oil return pipe (2) is wound around and welded to the outer wall surface of the liquid separation tank (1), and the inlet of the oil return pipe (2) leads to the oil return port (103).

2. The liquid dispenser according to claim 1, characterized in that: The oil return pipe (2) comprises an oil inlet section (201), the oil inlet section (201) is in communication with the oil return port (103) and is welded and fixed on the liquid separation tank (1); the oil return pipe (2) comprises an oil outlet section (203), the oil outlet section (203) is welded and fixed on the liquid separation tank (1); The oil inlet section (201) and the oil outlet section (203) are connected via the damping section (202), and the outer diameters of the oil inlet section (201) and the oil outlet section (203) are both larger than the outer diameter of the damping section (202).

3. The liquid dispenser according to claim 2, characterized in that: The outer wall surface of the liquid separation tank (1) comprises a cylindrical outer wall surface, the oil outlet section (203) is fixed to the upper end of the liquid separation tank (1), and the damping section (202) is spirally wound on the cylindrical outer wall surface of the liquid separation tank (1).

4. The liquid dispenser according to claim 2, characterized in that: The damping section (202) is wound on the outer wall surface of the liquid separating tank (1) along the axial direction of the liquid separating tank (1).

5. The liquid dispenser according to any one of claims 2 to 4, characterized in that: The damping section (202) is a capillary tube.

6. The liquid dispenser according to claim 1, characterized in that: The liquid separation tank (1) is provided with an air intake pipe (101), the air intake pipe (101) comprising an air intake section inserted into the liquid separation tank (1), the air intake section being a straight section (1011); the inner surface of the liquid separation tank (1) comprises a cylindrical inner wall surface, the air intake section extending along a tangential direction of the cylindrical inner wall surface.

7. The liquid dispenser according to claim 1, characterized in that: The outer wall of the liquid separation tank (1) is covered with a protective rubber sleeve (3), and the protective rubber sleeve (3) covers at least a portion of the oil return pipe (2).

8. The liquid dispenser according to claim 1, characterized in that: The outer wall surface of the liquid separation tank (1) is provided with a coating, and the coating covers at least a portion of the oil return pipe (2).

9. The liquid dispenser according to claim 7, characterized in that: The oil return pipe (2) is controlled to be on and off by an oil return solenoid valve (206) for controlling the on and off of the oil return pipe (2); the liquid distributor also includes a temperature sensing device, and the oil return solenoid valve (206) is opened or closed according to the temperature detected by the temperature sensing device.

10. An air conditioner, characterized in that: It comprises a compressor (5) and a liquid separator according to any one of claims 1 to 9; the oil-gas mixture discharged from the compressor (5) flows into the liquid separator.

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