Oil return system and air conditioner

Abstract

The application relates to an oil return system and an air conditioner. The oil return system comprises an evaporator, a condenser, a driving assembly and an oil tank. The driving assembly comprises a first driving member and a second driving member. The first driving member is connected between the evaporator and the condenser, and the second driving member is connected between the evaporator and an oil inlet of the oil tank. 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 member, and drives the first driving member to drive the second driving member to move. When the second driving member moves, a pressure difference can be generated to drive the oil-containing refrigerant in the evaporator to flow into the oil tank. In this way, the driving assembly can utilize the pressure difference between the evaporator and the condenser to drive the oil-containing refrigerant in the evaporator into the oil tank, so as to realize efficient recovery of lubricating oil, and further enable the lubricating oil to fully lubricate the mechanical assembly, thereby ensuring reliable operation of the mechanical assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an oil return system and an air conditioner. BACKGROUND

[0002] In the prior art, in the running process of the lubricating system of an air conditioner, the lubricating oil in the oil tank is pumped to the bearing of the compressor after being pressurized by the oil pump, the lubricating oil can lubricate the bearing of the compressor and can take away the heat of the bearing, and finally flows back to the oil tank. In this process, limited by the gap between the bearing and the shaft, the gap between the comb seal and the impeller, etc., the lubricating oil will leak from the gap, thus inevitably entering the refrigeration system of the air conditioner.

[0003] The existing refrigeration system of the air conditioner includes an evaporator and a condenser, the lubricating oil entering the evaporator will not vaporize, while the refrigerant in the evaporator will evaporate into 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 upper surface of the liquid refrigerant in the evaporator. SUMMARY

[0004] Therefore, it is necessary to provide an oil return system and an air conditioner for solving the problem of how to realize the recovery of lubricating oil in the refrigeration system.

[0005] An oil return system includes an evaporator, a condenser, a driving assembly and an oil tank.

[0006] The driving assembly includes a first driving member and a second driving member in transmission connection with the first driving member, the first driving member is communicated between the evaporator and the condenser, and the second driving member is communicated between the evaporator and the oil inlet of the oil tank.

[0007] The first driving member is used to drive the second driving member to move under the action of the pressure difference between the evaporator and the condenser, the second driving member can generate a pressure difference and drive the oil-containing refrigerant in the evaporator to flow into the oil tank when moving, and the oil tank is used to separate the lubricating oil in the oil-containing refrigerant.

[0008] In one embodiment, the driving assembly is a pneumatic pump.

[0009] In one embodiment, the driving assembly further includes a rotating shaft, the first driving member is a first impeller, the second driving member is a second impeller, and the rotating shaft is connected between the first impeller and the second impeller.

[0010] The first impeller is used to drive the rotating shaft to rotate under the pressure difference between the evaporator and the condenser, the rotating shaft can drive the second impeller to rotate, and the second impeller can generate pressure difference and drive the oil-containing refrigerant in the evaporator to flow into the oil tank.

[0011] In one of the embodiments, the oil return system comprises an ejector having a first inlet end, a second inlet end and an outlet end;

[0012] The evaporator is communicated with the second driving member through the first inlet end and the outlet end, and the second inlet end is communicated with the condenser;

[0013] The ejector is used to use the high-pressure gaseous refrigerant in the condenser to inject the oil-containing refrigerant in the evaporator into the second driving member.

[0014] In one of the embodiments, the oil return system comprises a first injection inlet pipe, a second injection inlet pipe and an injection outlet pipe, the first injection inlet pipe is communicated between the evaporator and the first inlet end, the second injection inlet pipe is communicated between the condenser and the second inlet end, and the injection outlet pipe is communicated between the second driving member and the outlet end.

[0015] In one of the embodiments, the oil return system comprises a compressor, the compressor, the condenser, the first driving member and the evaporator are sequentially communicated to form a circulating flow path of refrigerant.

[0016] In one of the embodiments, the oil return system comprises an oil inlet pipeline and an oil outlet pipeline, the oil tank, the oil inlet pipeline, the compressor and the oil outlet pipeline are sequentially communicated to form a circulating loop of lubricating oil.

[0017] In one of the embodiments, the oil return system further comprises an oil pump, the oil pump is connected to the oil inlet pipeline and is used to drive the lubricating oil in the oil tank to flow into the compressor.

[0018] In one of the embodiments, the oil return system further comprises a balance pipe and a communication pipe, the communication pipe is communicated between the evaporator and the compressor, the balance pipe is communicated between the oil tank and the communication pipe, and the balance pipe is used to input the separated refrigerant into the communication pipe.

[0019] In one of the embodiments, the oil return system further comprises an oil return pipeline, the oil return pipeline is communicated between the second driving member and an oil inlet of the oil tank.

[0020] An air conditioner, characterized in that it comprises the oil return system in the foregoing embodiments.

[0021] The oil return system and the air conditioner, the oil return system comprises an evaporator, a condenser, a driving assembly and an oil tank; the driving assembly comprises a first driving member and a second driving member in transmission connection with the first driving member, the first driving member is communicated between the evaporator and the condenser, and the second driving member is communicated between the evaporator and an oil inlet of the oil tank; wherein the first driving member is used for driving the second driving member to move under the action of the pressure difference between the evaporator and the condenser, and the second driving member can generate a pressure difference and drive the oil-containing refrigerant in the evaporator to flow into the oil tank when moving. The oil return system in the embodiment of the present 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 member, and the first driving member drives the second driving member to move, and the second driving member can generate a pressure difference when moving to drive the oil-containing refrigerant in the evaporator to flow into the oil tank, and the oil tank can separate the lubricating oil in the oil-containing refrigerant from the refrigerant and re-transport the separated refrigerant to the refrigeration system to ensure the refrigeration effect, and the oil tank can also transport the separated lubricating oil to other mechanical components of the air conditioner to realize the lubrication of the mechanical components. In this way, the driving assembly can utilize the pressure difference between the evaporator and the condenser to drive the oil-containing refrigerant in the evaporator to the oil tank to realize efficient recovery of the lubricating oil, and then the lubricating oil can fully lubricate the mechanical components to ensure the reliable operation of the mechanical components. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the oil return system in an embodiment of the present application, wherein the dashed line represents the circulating loop of the lubricating oil, and the arrow represents the flow direction of the refrigerant, the oil-containing refrigerant or the lubricating oil.

[0023] Figure 2 It is a structure schematic view of the oil return system in another embodiment of the present application, wherein the dashed line represents the circulating loop of the lubricating oil, and the arrow represents the flow direction of the refrigerant, the oil-containing refrigerant or the lubricating oil.

[0024] Figure 3 It is a structure schematic view of the oil return system in another embodiment of the present application, wherein the dashed line represents the circulating loop of the lubricating oil, and the arrow represents the flow direction of the refrigerant, the oil-containing refrigerant or the lubricating oil. Figure 2 It is a local enlarged structure schematic view of the A area in the middle, wherein the arrow represents the flow direction of the refrigerant or the oil-containing refrigerant.

[0025] REFERENCE NUMERALS

[0026] The oil return system 100;

[0027] The evaporator 11; the condenser 12; the driving assembly 13; the first driving member 131; the second driving member 132; the ejector 14; the first inlet end 14a; the second inlet end 14b; the outlet end 14c; the compressor 15; the oil tank 16; the oil pump 17;

[0028] A first injection intake pipe 21; a second injection intake pipe 22; an injection exhaust pipe 23; an oil return pipe 24; an oil inlet pipe 25; an oil outlet pipe 26; a balance pipe 27; a communication pipe 28. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners according to other embodiments, and those skilled in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0032] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are used for illustrative purposes only and are not intended to be limiting.

[0035] Embodiments of the present application provide an air conditioner, which comprises an oil return system 100. The oil return system 100 is used to recover lubricating oil in a refrigeration system of the air conditioner.

[0036] Please refer to Figure 1 Embodiments of the present application provide an oil return system 100, which comprises an evaporator 11, a condenser 12, a driving assembly 13 and an oil tank 16.

[0037] The driving assembly 13 comprises a first driving member 131 and a second driving member 132 in driving connection with the first driving member 131. The first driving member 131 is in communication between the evaporator 11 and the condenser 12, and in communication between the evaporator 11 and an oil inlet of the oil tank 16.

[0038] The first driving member 131 is used to drive the second driving member 132 to move under the action of pressure difference between the evaporator 11 and the condenser 12. When the second driving member 132 moves, it can generate a pressure difference and drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16. The oil tank 16 is used to separate the lubricating oil from the oil-containing refrigerant.

[0039] It can be understood that in the refrigeration process of the evaporator 11 and the condenser 12, a high-pressure environment will be formed in the condenser 12, and a low-pressure environment will be formed in the evaporator 11. The condenser 12 and the evaporator 11 are in communication with each other, and the gaseous refrigerant will flow from the evaporator 11 to the condenser 12 due to the pressure difference between them.

[0040] In the embodiments 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 drives the first driving member 131 to drive the second driving member 132 to move, and the second driving member 132 can generate a pressure difference when moving, so as to drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16, and the oil tank 16 can separate the lubricating oil in the oil-containing refrigerant and re-deliver the separated gaseous refrigerant to the refrigeration system to ensure the refrigeration effect, and the oil tank 16 can also deliver the separated lubricating oil to other mechanical components of the air conditioner to realize the lubrication of the 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 to the oil tank 16 to realize efficient recovery of the lubricating oil, and then the lubricating oil can fully lubricate the mechanical components to ensure the reliable operation of the mechanical components.

[0041] It should be noted that the oil-containing refrigerant in the evaporator 11 refers to the mixture of the liquid refrigerant and the lubricating oil. Specifically, the liquid refrigerant entering the evaporator 11 will partially evaporate into gaseous refrigerant, and there is also liquid refrigerant in the evaporator 11. The lubricating oil entering the evaporator 11 cannot evaporate, and the density of the lubricating oil is lower than that of the liquid refrigerant. Therefore, the lubricating oil entering the evaporator 11 is finally enriched on the upper surface of the liquid refrigerant and mixed with it to form the oil-containing refrigerant.

[0042] The specific style of the driving assembly 13 is not limited. In some embodiments, the driving assembly 13 is a pneumatic pump.

[0043] In some embodiments, the driving assembly 13 further comprises a rotating shaft, the first driving member 131 is a first impeller, and the second driving member 132 is a second impeller, and the rotating shaft is connected between the first impeller and the second impeller.

[0044] The first impeller is used to drive the rotating shaft to rotate under the action of the 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 a pressure difference and drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16.

[0045] It can be understood 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 drive the first impeller to rotate and drive the rotating shaft to rotate, and the rotating shaft can drive the second impeller to rotate when rotating, and the second impeller can generate a pressure difference when rotating 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 to the oil tank 16 to realize efficient recovery of the lubricating oil, and then the lubricating oil can fully lubricate the mechanical components to ensure the reliable operation of the mechanical components.

[0046] In some embodiments, referring to Figure 2 and Figure 3 , the oil return system 100 comprises an ejector 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 first inlet end 14a and the outlet end 14c and the second driving member 132, and the second inlet end 14b is in communication with the condenser 12; the ejector 14 is used to use the high-pressure gas in the condenser 12 to eject the oil-containing refrigerant in the evaporator 11 into the second driving member 132, 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.

[0047] In the prior art, the ejector 14 has a small ejector hole size, and in the actual use of the ejector 14, the ejector hole is often blocked by foreign matters such as welding slag and oxide scale, thereby directly affecting the ejecting efficiency and even causing the ejector to fail. Therefore, a filter is often arranged at the front end of the ejector 14 to filter the foreign matters through the filter, thereby avoiding the blockage of the ejector hole of the ejector 14. However, since the filter itself has a pressure drop, long-term blockage of the foreign matters will increase the pressure drop of the filter, thereby directly causing the inlet pressure of the ejector 14 to decrease and directly affecting the ejecting power, resulting in a decrease in the ejecting efficiency.

[0048] 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 to use the high-pressure action to eject the low-pressure oil-containing refrigerant in the evaporator 11 into the ejector 14 through the first inlet end 14a and make the low-pressure oil-containing refrigerant in the evaporator 11 jet into the second driving member 132 from the outlet end 14c. At the same time, 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 when moving, thereby driving the oil-containing refrigerant in the ejector 14 to further flow into the oil tank 16. In this way, the oil return system 100 in the embodiment of the present application has a simple structure, the driving assembly 13 can generate a pressure difference to actively drive the oil-containing refrigerant flowing into the ejector 14, thereby realizing efficient operation of the ejector 14, effectively avoiding the decrease in the ejecting efficiency or failure of the ejector 14 caused by blockage of the ejector 14, and timely sending the low-pressure oil-containing refrigerant in the evaporator 11 to the oil tank 16, realizing efficient recovery of the lubricating oil, and further enabling the lubricating oil to fully lubricate the mechanical components, thereby ensuring reliable operation of the mechanical components.

[0049] In some embodiments, referring to Figure 2 and Figure 3The oil return system 100 comprises a first ejector inlet pipe 21, a second ejector inlet pipe 22 and an ejector outlet pipe 23. The first ejector inlet pipe 21 is connected between the evaporator 11 and the first inlet end 14a. The second ejector inlet pipe 22 is connected between the condenser 12 and the second inlet end 14b. The ejector outlet pipe 23 is connected between the second driving member 132 and the outlet end 14c.

[0050] 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 ejector inlet pipe 22. The low-pressure oil-containing refrigerant in the evaporator 11 can be injected into the ejector 14 through the first ejector inlet pipe 21 under the action of high pressure and flows through the outlet end 14c, and then is sprayed into the ejector outlet pipe 23 through the outlet end 14c and flows into the second driving member 132.

[0051] In some embodiments, referring to Figure 1 and Figure 2 , the oil return system 100 further comprises an oil return pipeline 24 connected between the second driving member 132 and the oil inlet of the oil tank 16.

[0052] During the operation of the oil return system 100, the oil-containing refrigerant flowing into the second driving member 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 member 132. The oil tank 16 can separate the lubricating oil from the refrigerant in the oil-containing refrigerant and further transport the separated refrigerant back to the refrigeration system to ensure the refrigeration effect. The oil tank 16 can also transport the separated lubricating oil to other mechanical components of the air conditioner to lubricate the mechanical components.

[0053] In some embodiments, referring to Figure 1 and Figure 2 , the oil return system 100 comprises a compressor 15. The compressor 15, the condenser 12, the first driving member 131 and the evaporator 11 are sequentially connected to form a circulating flow path of the refrigerant.

[0054] It can be understood that the refrigerant can flow into the compressor 15, the condenser 12, the first driving member 131 and the evaporator 11 in sequence and realize the refrigeration effect under the action of the four.

[0055] Specifically, during the refrigeration process, the refrigerant becomes high-temperature and high-pressure gas state through the compressor 15, enters the evaporator 11 after being cooled by the condenser 12, and the refrigerant in the evaporator 11 exchanges heat with the air sucked by the evaporator 11 to form cold air, which is blown out to realize the refrigeration effect. The refrigerant after heat exchange reenters the compressor 15. In this way, the refrigerant circulates and flows among the compressor 15, the condenser 12, the first driving member 131 and the evaporator 11 to repeat the above refrigeration process, thereby realizing continuous refrigeration effect.

[0056] In some embodiments, referring to Figure 1 and Figure 2 , the oil return system 100 comprises an oil inlet pipeline 25 and an oil outlet pipeline 26, and the oil tank 16, the oil inlet pipeline 25, the compressor 15 and the oil outlet pipeline 26 are sequentially communicated to form a lubricating oil circulation loop.

[0057] It can be understood that the oil tank 16 itself stores lubricating oil for supplying the compressor 15 for lubrication, and the oil tank 16 also stores the oil-containing refrigerant recovered from the evaporator 11, and the oil tank 16 can separate the refrigerant and the lubricating oil in the oil-containing refrigerant, and re-supply the separated lubricating oil to the compressor 15 for lubrication.

[0058] Specifically, the oil tank 16 can evaporate the refrigerant in the oil-containing refrigerant into a gaseous state by high temperature, and the lubricating oil is not evaporated by heating, so that the lubricating oil is separated from the refrigerant, thereby realizing cooling, purification and recovery of the lubricating oil.

[0059] In the embodiments 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 the lubricating oil in the compressor 15 is sent back to the oil tank 16 through the oil outlet pipeline 26, so as to form a circulation loop between the oil tank 16 and the compressor 15. The circulation loop can supply the lubricating oil in the oil tank 16 to the compressor 15, and recover the lubricating oil to the oil tank 16 after the lubricating oil realizes lubrication, so as to ensure reliable operation of the mechanical components.

[0060] In some embodiments, referring to Figure 1 and Figure 2 , the oil return system 100 further comprises an oil pump 17, which is connected to the oil inlet pipeline 25 and is used to drive the lubricating oil in the oil tank 16 to flow into the compressor 15.

[0061] It can be understood that the lubricating oil in the oil tank 16 is pumped to the compressor 15 under the action of the oil pump 17 to improve the circulation loop to lubricate and cool the bearings or other mechanical structures of the compressor 15, and the lubricating oil in the compressor 15 is sent back to the oil tank 16 through the oil outlet pipeline 26, so as to form a circulation loop between the oil tank 16 and the compressor 15.

[0062] In some embodiments, referring to Figure 1 and Figure 2 , the oil return system 100 further comprises a balance pipe 27 and a communication pipe 28, the communication pipe 28 is communicated between the evaporator 11 and the compressor 15, and the balance pipe 27 is communicated between the gas outlet of the oil tank 16 and the communication pipe 28.

[0063] It can be understood that the refrigerant exchanges heat with the air sucked by the evaporator 11 in the evaporator 11 to make the air form cold air, and the cold air is blown out to achieve the refrigeration effect, the communication pipe 28 is used to send the refrigerant after heat exchange in the evaporator 11 to the compressor 15, and then compressed into high-temperature and high-pressure gas by the compressor 15, and flows into the condenser 12. The balance pipe 27 is used to transport the gaseous refrigerant separated from the oil tank 16 to the communication pipe 28, so that the gaseous refrigerant separated from the oil tank 16 is transported to the compressor 15 together with the refrigerant after heat exchange in the evaporator 11, so that enough refrigerant can participate in the refrigeration process to ensure the refrigeration effect.

[0064] The above oil return system 100 and 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, to drive the oil-containing refrigerant in the evaporator 11 to flow into the oil tank 16, and the oil tank 16 can separate the lubricating oil in the oil-containing refrigerant from the refrigerant, and re-transport the separated refrigerant to the refrigeration system to ensure the refrigeration effect, and the oil tank 16 can also transport the separated lubricating oil to other mechanical components of the air conditioner to realize the 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 to the oil tank 16 to realize efficient recovery of the lubricating oil, so that the lubricating oil can fully lubricate the mechanical components to ensure the reliable operation of the mechanical components.

[0065] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0066] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An oil return system characterized by, The system comprises an evaporator, a condenser, a driving assembly, an oil tank and an ejector. The driving assembly comprises a first driving member and a second driving member in transmission connection with the first driving member, the first driving member being in communication between the evaporator and the condenser, and the second driving member being in communication between the evaporator and an oil inlet of the oil tank. The ejector has a first inlet end, a second inlet end and an outlet end, the evaporator being in communication with the second driving member through the first inlet end and the outlet end, and the second inlet end being in communication with the condenser, the ejector being used to eject the oil-containing refrigerant in the evaporator into the second driving member by using the high-pressure gaseous refrigerant in the condenser. The first driving member is used to drive the second driving member to move under the pressure difference between the evaporator and the condenser, the second driving member can generate a 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 to separate the lubricating oil from the oil-containing refrigerant.

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

3. The oil return system of claim 1, wherein The driving assembly further comprises a rotating shaft, the first driving member is a first impeller, and the second driving member is a second impeller, the rotating shaft being connected between the first impeller and the second impeller. The first impeller is used to drive the rotating shaft to rotate under the 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 a 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, wherein The system further comprises a first ejector inlet pipe, a second ejector inlet pipe and an ejector outlet pipe, the first ejector inlet pipe being in communication between the evaporator and the first inlet end, the second ejector inlet pipe being in communication between the condenser and the second inlet end, and the ejector outlet pipe being in communication between the second driving member and the outlet end.

5. The oil return system of claim 1, wherein The system further comprises a compressor, the compressor, the condenser, the first driving member and the evaporator being sequentially communicated to form a circulating flow path of refrigerant.

6. The oil return system of claim 5, wherein The system further comprises an oil inlet pipeline and an oil outlet pipeline, the oil tank, the oil inlet pipeline, the compressor and the oil outlet pipeline being sequentially communicated to form a circulating loop of lubricating oil.

7. The oil return system of claim 6, wherein The system further comprises an oil pump, the oil pump being connected to the oil inlet pipeline and being used to drive the lubricating oil in the oil tank to flow into the compressor.

8. The oil return system of claim 5, wherein, The system further comprises a balance pipe and a communication pipe, the communication pipe being in communication between the evaporator and the compressor, and the balance pipe being in communication between the oil tank and the communication pipe, the balance pipe being used to input the separated refrigerant into the communication pipe.

9. The oil return system of claim 1, wherein, The system further comprises an oil return pipeline, the oil return pipeline being in communication between the second driving member and the oil inlet of the oil tank.

10. An air conditioner characterized by comprising: The system further comprises the oil return system according to any one of claims 1-9. The system further comprises the oil return system according to any one of claims 1-9.

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