CN117006739A - Oil return system and air conditioner - Google Patents

Abstract

The application relates to an oil return system and an air conditioner, wherein the oil return system comprises an evaporator, a condenser, a driving assembly and an oil tank, the driving assembly comprises a first driving piece and a second driving piece, the first driving piece is communicated between the evaporator and the condenser, the second driving piece is communicated between the evaporator and an oil inlet of the oil tank, the pressure difference between low-pressure gaseous refrigerant of the evaporator and high-pressure gaseous refrigerant of the condenser can act on the first driving piece, the first driving piece drives the second driving piece to move, and the pressure difference can be generated when the second driving piece moves so as to drive the oil-containing refrigerant in the evaporator to flow into the oil tank. So, the differential pressure between the evaporator and the condenser can be utilized by the driving assembly to drive the oil-containing refrigerant in the evaporator into the oil tank, so that the efficient recovery of lubricating oil is realized, and the lubricating oil can fully realize the lubricating effect on the mechanical assembly, so that the reliable operation of the mechanical assembly is ensured.

Description

Oil return system and air conditioner

Technical Field

The application relates to the technical field of air conditioners, in particular to an oil return system and an air conditioner.

Background

In the prior art, in the operation process of a lubrication system of an air conditioner, lubricating oil in an oil tank is pumped to a bearing of a compressor after being boosted by an oil pump, the lubricating oil can lubricate the bearing of the compressor and can take away heat of the bearing, and finally, the lubricating oil flows back to the oil tank. In the process, the lubricating oil is limited by the gap between the bearing and the shaft, the gap between the comb teeth seal and the impeller and the like, and the lubricating oil can leak from the gap, so that the lubricating oil can not enter a refrigerating system of the air conditioner.

The existing refrigeration system of the air conditioner comprises an evaporator and a condenser, the lubricating oil entering the evaporator is not evaporated and vaporized, the refrigerant in the evaporator is evaporated into a gaseous refrigerant, and the density of the lubricating oil is lower than that of the liquid refrigerant, so that the lubricating oil finally entering the refrigeration system is finally enriched on the liquid refrigerant of the evaporator.

Disclosure of Invention

Based on this, it is necessary to provide an oil return system and an air conditioner for how to realize recovery of lubricating oil in a refrigeration system.

An oil return system comprises an evaporator, a condenser, a driving assembly and an oil tank;

the driving assembly comprises a first driving piece and a second driving piece in transmission connection with the first driving piece, the first driving piece is communicated between the evaporator and the condenser, and the second driving piece is communicated between the evaporator and an oil inlet of the oil tank;

the first driving part is used for driving the second driving part to move under the action of pressure difference between the evaporator and the condenser, the second driving part can generate pressure difference when moving and drive the oil-containing refrigerant in the evaporator to flow into the oil tank, and the oil tank is used for separating lubricating oil in the oil-containing refrigerant.

In one embodiment, the drive assembly is a pneumatic pump.

In one embodiment, the driving assembly further comprises a rotating shaft, the first driving piece is a first impeller, the second driving piece is a second impeller, and the rotating shaft is connected between the first impeller and the second impeller;

the first impeller is used for driving the rotating shaft to rotate under the action of pressure difference between the evaporator and the condenser, the rotating shaft can drive the second impeller to rotate when rotating, and the second impeller can generate pressure difference when rotating and drive the oil-containing refrigerant in the evaporator to flow into the oil tank.

In one embodiment, the oil return system comprises an ejector, wherein the ejector is provided with a first inlet end, a second inlet end and an outlet end;

the evaporator is communicated with the second driving piece through the first inlet end and the outlet end, and the second inlet end is communicated with the condenser;

the ejector is used for ejecting the oil-containing refrigerant in the evaporator into the second driving piece by utilizing the high-pressure gaseous refrigerant in the condenser.

In one embodiment, the oil return system comprises a first injection air inlet pipe, a second injection air inlet pipe and an injection air outlet pipe, wherein the first injection air inlet pipe is communicated between the evaporator and the first inlet end, the second injection air inlet pipe is communicated between the condenser and the second inlet end, and the injection air outlet pipe is communicated between the second driving piece and the outlet end.

In one embodiment, the oil return system includes a compressor, and the compressor, the condenser, the first driving member, and the evaporator are sequentially communicated to form a circulation flow path of the refrigerant.

In one embodiment, the oil return system comprises an oil inlet pipeline and an oil outlet pipeline, and the oil tank, the oil inlet pipeline, the compressor and the oil outlet pipeline are sequentially communicated to form a circulation loop of lubricating oil.

In one embodiment, the oil return system further comprises an oil pump coupled to the oil inlet line and configured to drive the flow of the lubricant in the oil tank into the compressor.

In one embodiment, the oil return system further includes a balance pipe and a communication pipe, the communication pipe is connected between the evaporator and the compressor, the balance pipe is connected between the oil tank and the communication pipe, and the balance pipe is used for inputting the separated refrigerant into the communication pipe.

In one embodiment, the oil return system further comprises an oil return line, which is communicated between the second driving member and the oil inlet of the oil tank.

An air conditioner is characterized by comprising the oil return system in the previous embodiment.

The oil return system comprises an evaporator, a condenser, a driving assembly and an oil tank; the driving assembly comprises a first driving piece and a second driving piece in transmission connection with the first driving piece, the first driving piece is communicated between the evaporator and the condenser, and the second driving piece is communicated between the evaporator and an oil inlet of the oil tank; the first driving part is used for driving the second driving part to move under the action of pressure difference between the evaporator and the condenser, and the second driving part can generate pressure difference and drive the oil-containing refrigerant in the evaporator to flow into the oil tank when moving. According to the oil return system provided by the embodiment of the application, the pressure difference between the low-pressure gaseous refrigerant of the evaporator and the high-pressure gaseous refrigerant of the condenser acts on the first driving part, the first driving part drives the second driving part to move, the pressure difference can be generated when the second driving part moves, so that the oil-containing refrigerant in the evaporator can be driven to flow into the oil tank, the oil tank can separate lubricating oil in the oil-containing refrigerant from the refrigerant, the separated refrigerant is conveyed to the refrigerating system again, the refrigerating effect is ensured, and the oil tank can also convey the separated lubricating oil to other mechanical components of the air conditioner, so that the lubrication of the mechanical components is realized. So, the differential pressure between the evaporator and the condenser can be utilized by the driving assembly to drive the oil-containing refrigerant in the evaporator into the oil tank, so that the efficient recovery of lubricating oil is realized, and the lubricating oil can fully realize the lubricating effect on the mechanical assembly, so that the reliable operation of the mechanical assembly is ensured.

Drawings

Fig. 1 is a schematic structural diagram of an oil return system according to an embodiment of the present application, wherein a dotted line indicates a circulation loop of lubricating oil, and an arrow indicates a flow direction of a refrigerant, an oil-containing refrigerant, or the lubricating oil.

Fig. 2 is a schematic structural diagram of an oil return system according to another embodiment of the present application, wherein a dotted line indicates a circulation loop of lubricating oil, and an arrow indicates a flow direction of a refrigerant, an oil-containing refrigerant, or the lubricating oil.

Fig. 3 is a schematic view of a partial enlarged structure of a region a in fig. 2, wherein arrows indicate a flow direction of a refrigerant or an oil-containing refrigerant.

Reference numerals

An oil return system 100;

an evaporator 11; a condenser 12; a drive assembly 13; a first driving member 131; a second driving member 132; an ejector 14; a first inlet end 14a; a second inlet end 14b; an outlet end 14c; a compressor 15; a fuel tank 16; an oil pump 17;

a first injection inlet pipe 21; a second ejector inlet pipe 22; an ejector outlet pipe 23; an oil return line 24; an oil inlet line 25; an oil outlet line 26; a balance tube 27; and a communication pipe 28.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

An aspect of an embodiment of the present application provides an air conditioner, which includes an oil return system 100. The oil return system 100 is used to recover lubricating oil in the refrigeration system of an air conditioner.

Referring to fig. 1, in one aspect, an oil return system 100 is provided, and includes an evaporator 11, a condenser 12, a driving assembly 13, and an oil tank 16;

the driving assembly 13 comprises a first driving member 131 and a second driving member 132 in transmission connection with the first driving member 131, wherein the first driving member 131 is communicated between the evaporator 11 and the condenser 12, and is communicated between the evaporator 11 and an oil inlet of the oil tank 16.

The first driving member 131 is configured to drive the second driving member 132 to move under the action of a pressure difference between the evaporator 11 and the condenser 12, and when the second driving member 132 moves, the pressure difference can be generated and the oil-containing refrigerant in the evaporator 11 is driven to flow into the oil tank 16, and the oil tank 16 is configured to separate lubricating oil from the oil-containing refrigerant.

It will be appreciated that during the refrigeration of the evaporator 11 and the condenser 12, a high pressure environment is formed in the condenser 12, a low pressure environment is formed in the evaporator 11, the condenser 12 and the evaporator 11 are in communication with each other, and a gaseous refrigerant flows from the evaporator 11 to the condenser 12 due to a pressure difference.

In the embodiment of the present application, the pressure difference between the low-pressure gaseous refrigerant of the evaporator 11 and the high-pressure gaseous refrigerant of the condenser 12 acts on the first driving member 131, and the first driving member 131 drives the second driving member 132 to move, the second driving member 132 generates a pressure difference when moving, so as to drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16, the oil tank 16 can separate the lubricating oil in the oil-containing refrigerant, and the separated gaseous refrigerant is re-conveyed into the refrigerating system, so as to ensure the refrigerating effect, and the oil tank 16 can also convey the separated lubricating oil into other mechanical components of the air conditioner, so as to realize the lubrication of other mechanical components. In this way, the driving assembly 13 can utilize the pressure difference between the evaporator 11 and the condenser 12 to drive the oil-containing refrigerant in the evaporator 11 into the oil tank 16, so as to realize efficient recovery of lubricating oil, and further enable the lubricating oil to fully realize lubrication action on the mechanical assembly, so as to ensure reliable operation of the mechanical assembly.

The oil-containing refrigerant in the evaporator 11 is a mixture of a liquid refrigerant and lubricating oil. Specifically, the liquid refrigerant is partially evaporated into a gaseous refrigerant after entering the evaporator 11, and the liquid refrigerant is also present in the evaporator 11, the lubricant entering the evaporator 11 cannot be evaporated, and the lubricant density is lower than that of the liquid refrigerant, so that the lubricant entering the evaporator 11 is finally enriched in the upper table of the liquid refrigerant and mixed with the upper table of the liquid refrigerant to form the oil-containing refrigerant.

The specific style of the drive assembly 13 is not limited. In some embodiments, the drive assembly 13 is a pneumatic pump.

In some embodiments, the driving assembly 13 further includes a rotating shaft, the first driving member 131 is a first impeller, the second driving member 132 is a second impeller, and the rotating shaft is connected between the first impeller and the second impeller;

the first impeller is used for driving the rotating shaft to rotate under the action of pressure difference between the evaporator 11 and the condenser 12, the rotating shaft can drive the second impeller to rotate when rotating, and the second impeller can generate pressure difference when rotating and drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16.

It will be appreciated that the pressure difference between the low pressure gaseous refrigerant of the evaporator 11 and the high pressure gaseous refrigerant of the condenser 12 acts on the first impeller to rotate the first impeller to drive the rotating shaft, and the rotating shaft can drive the second impeller to rotate when rotating, and the second impeller can generate pressure difference when rotating, so as to drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16. In this way, the driving assembly 13 can utilize the pressure difference between the evaporator 11 and the condenser 12 to drive the oil-containing refrigerant in the evaporator 11 into the oil tank 16, so as to realize efficient recovery of lubricating oil, and further enable the lubricating oil to fully realize lubrication action on the mechanical assembly, so as to ensure reliable operation of the mechanical assembly.

In some embodiments, referring to fig. 2 and 3, the oil return system 100 includes an eductor 14, the eductor 14 having a first inlet end 14a, a second inlet end 14b, and an outlet end 14c; the evaporator 11 is in communication with the second driving member 132 through a first inlet end 14a and an outlet end 14c, and a second inlet end 14b is in communication with the condenser 12; the ejector 14 is used for ejecting the oil-containing refrigerant in the evaporator 11 to the second driving member 132 by using the high-pressure gas in the condenser 12, and the second driving member 132 can generate a pressure difference and drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16.

In the prior art, the ejector 14 is small in size of the ejector hole, and in the actual use process of the ejector 14, the ejector hole is often blocked by foreign matters such as welding slag, oxide skin and the like, so that the ejector efficiency is directly affected, and even ejection failure can be caused. Therefore, a filter is often provided at the front end of the ejector 14 to filter foreign substances through the filter, thereby avoiding clogging of the ejection hole of the ejector 14. However, due to the pressure drop of the filter, the pressure drop of the filter can be increased due to the long-term blockage of the foreign matters, so that the inlet pressure of the ejector 14 is reduced, the ejection power is directly influenced, and the ejection efficiency is reduced.

In the embodiment of the present application, the high-pressure gaseous refrigerant in the condenser 12 flows into the ejector 14 through the second inlet end 14b, so that the low-pressure oil-containing refrigerant in the evaporator 11 is ejected into the ejector 14 through the first inlet end 14a by using the high-pressure effect, and the low-pressure oil-containing refrigerant in the evaporator 11 bursts into the second driving member 132 from the outlet end 14 c. Meanwhile, the second driving member 132 moves under the driving of the first driving member 131, and the second driving member 132 generates a pressure difference during movement, so as to drive the oil-containing refrigerant in the ejector 14 to further flow into the oil tank 16. Thus, the oil return system 100 in the embodiment of the application has a simple structure, the driving assembly 13 can generate pressure difference to actively drive the oil-containing refrigerant flowing into the ejector 14, so that the ejector 14 can operate efficiently, the ejection efficiency reduction or failure caused by the blockage of the ejector 14 can be directly and effectively avoided, the oil-containing refrigerant in the evaporator 11 is timely sent to the oil tank 16, the efficient recovery of lubricating oil is realized, and further the lubricating oil can fully lubricate the mechanical assembly, so that the reliable operation of the mechanical assembly is ensured.

In some embodiments, referring to fig. 2 and 3, the oil return system 100 includes a first injection air inlet pipe 21, a second injection air inlet pipe 22, and an injection air outlet pipe 23, where the first injection air inlet pipe 21 is connected between the evaporator 11 and the first inlet end 14a, the second injection air inlet pipe 22 is connected between the condenser 12 and the second inlet end 14b, and the injection air outlet pipe 23 is connected between the second driving member 132 and the outlet end 14 c.

During the operation of the oil return system 100, the high-pressure gaseous refrigerant in the condenser 12 flows into the ejector 14 through the second injection air inlet pipe 22, and the low-pressure oil-containing refrigerant in the evaporator 11 can be injected into the ejector 14 through the first injection air inlet pipe 21 under the high-pressure action and flows through the outlet end 14c, and then is sprayed to the injection air outlet pipe 23 through the outlet end 14c until flowing into the second driving member 132.

In some embodiments, referring to fig. 1 and 2, the oil return system 100 further includes an oil return line 24, where the oil return line 24 is in communication between the second driving member 132 and an oil inlet of the oil tank 16.

In the operation process of the oil return system 100, the oil-containing refrigerant flowing into the second driving part 132 enters the oil tank 16 through the oil return pipeline 24 under the action of the pressure difference generated by the movement of the second driving part 132, the oil tank 16 can separate lubricating oil in the oil-containing refrigerant from the refrigerant and further convey the separated refrigerant to the refrigerating system again so as to ensure the refrigerating effect, and the oil tank 16 can convey the separated lubricating oil to other mechanical components of the air conditioner so as to realize the lubrication of the mechanical components.

In some embodiments, referring to fig. 1 and 2, the oil return system 100 includes a compressor 15, a condenser 12, a first driving member 131 and an evaporator 11 sequentially connected to form a circulation flow path of the refrigerant.

It will be appreciated that the refrigerant can flow into the compressor 15, the condenser 12, the first driving member 131 and the evaporator 11 in sequence, and the refrigeration effect is achieved by the four functions.

Specifically, during the refrigeration process, the refrigerant is in a high-temperature high-pressure gaseous state through the compressor 15, flows into the condenser 12 and is cooled by the condenser 12 and then enters the evaporator 11, the refrigerant in the evaporator 11 exchanges heat with the air sucked by the evaporator 11 to form cold air, the cold air is blown out to realize the refrigeration effect, and the refrigerant after heat exchange enters the compressor 15 again. In this way, the refrigerant circulates among the compressor 15, the condenser 12, the first driving member 131 and the evaporator 11 to repeat the above-mentioned refrigerating process, thereby achieving a continuous refrigerating effect.

In some embodiments, referring to fig. 1 and 2, the oil return system 100 includes an oil inlet pipe 25 and an oil outlet pipe 26, and the oil tank 16, the oil inlet pipe 25, the compressor 15 and the oil outlet pipe 26 are sequentially connected to form a circulation loop of lubricating oil.

It will be appreciated that the oil tank 16 itself stores lubricating oil for lubrication of the compressor 15, and that the oil tank 16 also stores oil-containing refrigerant recovered from the evaporator 11, and that the oil tank 16 is capable of separating the refrigerant in the oil-containing refrigerant from the lubricating oil and re-supplying the separated lubricating oil to the compressor 15 for lubrication.

Specifically, the oil tank 16 can evaporate the refrigerant in the oil-containing refrigerant into a gaseous state at a high temperature, and the lubricating oil is heated without evaporation, so that the lubricating oil is separated from the refrigerant, thereby realizing cooling, purification and recovery of the lubricating oil.

In the embodiment of the present application, the lubricating oil in the oil tank 16 is delivered to the compressor 15 through the oil inlet pipeline 25 to lubricate and cool the bearings or other mechanical structures of the compressor 15, and then the lubricating oil in the compressor 15 is returned to the oil tank 16 through the oil outlet pipeline 26, so that a circulation loop is formed between the oil tank 16 and the compressor 15. The circulation circuit is able to supply the compressor 15 with the lubricant in the tank 16 and to recover the lubricant to the tank 16 after the lubrication has been effected, so as to ensure a reliable operation of the mechanical assembly.

In some embodiments, referring to fig. 1 and 2, the oil return system 100 further includes an oil pump 17, where the oil pump 17 is coupled to the oil inlet line 25 and is used to drive the lubrication oil in the oil tank 16 to flow into the compressor 15.

It will be appreciated that the lubricant in the oil tank 16 is pumped into the compressor 15 by the oil pump 17 to enhance the circulation circuit to lubricate and cool the bearings or other mechanical structures of the compressor 15, and that the lubricant in the compressor 15 is returned to the oil tank 16 through the oil outlet line 26 to be circulated, thereby forming a circulation circuit between the oil tank 16 and the compressor 15.

In some embodiments, referring to fig. 1 and 2, the oil return system 100 further includes a balance pipe 27 and a communication pipe 28, the communication pipe 28 is connected between the evaporator 11 and the compressor 15, and the balance pipe 27 is connected between the air outlet of the oil tank 16 and the communication pipe 28.

It will be appreciated that the refrigerant exchanges heat with air sucked into the evaporator 11 in the evaporator 11 to form cool air and blow the cool air out to achieve a cooling effect, and the communication pipe 28 is used to send the refrigerant after heat exchange in the evaporator 11 to the compressor 15, then compressed into high-temperature high-pressure gas by the compressor 15, and flows into the condenser 12. The balance pipe 27 is used for conveying the gaseous refrigerant separated from the oil tank 16 to the communicating pipe 28, so that the gaseous refrigerant separated from the oil tank 16 and the refrigerant after heat exchange in the evaporator 11 are conveyed to the compressor 15 together, and a sufficient amount of refrigerant can participate in the refrigeration process to ensure the refrigeration effect.

The above oil return system 100 and the air conditioner, the pressure difference between the low-pressure gaseous refrigerant of the evaporator 11 and the high-pressure gaseous refrigerant of the condenser 12 acts on the first driving member 131, and the first driving member 131 drives the second driving member 132 to move, the second driving member 132 can generate pressure difference when moving, so as to drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16, the oil tank 16 can separate the lubricating oil in the oil-containing refrigerant from the refrigerant, and the separated refrigerant is re-conveyed into the refrigerating system, so as to ensure the refrigerating effect, and the oil tank 16 can also convey the separated lubricating oil into other mechanical components of the air conditioner, so as to realize lubrication of the mechanical components. In this way, the driving assembly 13 can utilize the pressure difference between the evaporator 11 and the condenser 12 to drive the oil-containing refrigerant in the evaporator 11 into the oil tank 16, so as to realize efficient recovery of lubricating oil, and further enable the lubricating oil to fully realize lubrication action on the mechanical assembly, so as to ensure reliable operation of the mechanical assembly.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (11)

1. An oil return system is characterized by comprising an evaporator, a condenser, a driving assembly and an oil tank;

the driving assembly comprises a first driving piece and a second driving piece in transmission connection with the first driving piece, the first driving piece is communicated between the evaporator and the condenser, and the second driving piece is communicated between the evaporator and an oil inlet of the oil tank;

the first driving part is used for driving the second driving part to move under the action of pressure difference between the evaporator and the condenser, the second driving part can generate pressure difference when moving and drive the oil-containing refrigerant in the evaporator to flow into the oil tank, and the oil tank is used for separating lubricating oil in the oil-containing refrigerant.

2. The oil return system of claim 1, wherein the drive assembly is a pneumatic pump.

3. The oil return system of claim 1, wherein the drive assembly further comprises a shaft, the first drive member is a first impeller, the second drive member is a second impeller, and the shaft is connected between the first impeller and the second impeller;

the first impeller is used for driving the rotating shaft to rotate under the action of pressure difference between the evaporator and the condenser, the rotating shaft can drive the second impeller to rotate when rotating, and the second impeller can generate pressure difference when rotating and drive the oil-containing refrigerant in the evaporator to flow into the oil tank.

4. The oil return system of claim 1, comprising an eductor having a first inlet end, a second inlet end, and an outlet end;

the evaporator is communicated with the second driving piece through the first inlet end and the outlet end, and the second inlet end is communicated with the condenser;

the ejector is used for ejecting the oily refrigerant in the evaporator into the second driving piece by utilizing the high-pressure gaseous refrigerant in the condenser.

5. The oil return system of claim 4, comprising a first injection inlet pipe, a second injection inlet pipe, and an injection outlet pipe, wherein the first injection inlet pipe is in communication between the evaporator and the first inlet end, the second injection inlet pipe is in communication between the condenser and the second inlet end, and the injection outlet pipe is in communication between the second driving member and the outlet end.

6. The oil return system of claim 1, comprising a compressor, wherein the compressor, the condenser, the first drive member, and the evaporator are in communication in sequence to form a circulating flow path for a refrigerant.

7. The oil return system of claim 6, comprising an oil inlet line and an oil outlet line, wherein the oil tank, the oil inlet line, the compressor, and the oil outlet line are sequentially connected to form a circulation loop for lubricating oil.

8. The oil return system of claim 7, further comprising an oil pump coupled to the oil inlet line and configured to drive the flow of lubricant within the oil tank into the compressor.

9. The oil return system according to claim 6, further comprising a balance pipe and a communication pipe, the communication pipe being communicated between the evaporator and the compressor, the balance pipe being communicated between the oil tank and the communication pipe, the balance pipe being for inputting the separated refrigerant into the communication pipe.

10. The oil return system of claim 1, further comprising an oil return line in communication between the second drive member and an oil inlet of the oil tank.

11. An air conditioner comprising the oil return system according to any one of claims 1 to 10.