Oil return system for compressor

Abstract

The present invention relates to the technical field of compressors, and particularly relates to an oil return system for a compressor, a compressor and an air conditioner. The oil return system for the compressor includes a compressor housing, a liquid storage tank communicated with the compressor housing, a motor disposed inside the compressor housing, an upper cover disposed at the upper end of the compressor housing, and a lower cover disposed at the bottom of the compressor housing. An upper cavity is formed between the upper cover and the motor, and an oil sump is formed between the lower cover and the compressor housing. The upper cavity and the oil sump are communicated through an oil return pipe, and an oil-gas separation and collection assembly for guiding oil to the oil return pipe is disposed in the upper cavity. The oil return pipe of the present invention communicates the upper cavity and the oil sump, and at the same time, an oil-gas separation and collection assembly is disposed in the upper cavity. The oil-gas separation and collection assembly improves the effect of oil-gas separation. Oil can flow back to the oil sump through the oil return pipe, avoiding the problem of wear of compressor parts caused by less oil or lack of oil during the operation of the compressor, extending the service life of the compressor, and improving the reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly relates to an oil return system for a compressor. Background Art

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas and is the heart of a refrigeration system. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, compresses it by driving a piston through the operation of an electric motor, and then discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. With the continuous progress of compressor and air-conditioning system technologies, higher requirements are placed on the quality and technology of compressors. Inside the compressor, lubricating oil is generally injected to reduce the friction between internal components of the compressor, make the movement between components more smooth, and reduce component wear. Currently, during the operation of the compressor, situations of oil shortage or insufficient oil often occur due to excessive oil discharge from the compressor, resulting in easy wear of the compressor mechanism in a high-temperature and high-pressure environment, reducing the service life of compressor components and mechanisms, thereby reducing the reliable life of the compressor. The wear of internal mechanisms and components of the compressor will also lead to frequent compressor failures. Summary of the Invention

[0003] To solve the above problems, the present invention provides an oil return system for a compressor that can avoid wear problems of compressor components caused by oil shortage or insufficient oil. At the same time, the present invention also provides a compressor including the aforementioned oil return system for a compressor, and an air conditioner including the aforementioned compressor.

[0004] The present invention is implemented as follows:

[0005] An oil return system for a compressor includes a compressor housing, an electric motor disposed inside the compressor housing, an upper cover disposed at the upper end of the compressor housing, and a lower cover disposed at the bottom of the compressor housing. The space between the upper cover and the electric motor forms the upper cavity of the compressor. The space between the lower cover and the compressor housing forms an oil sump for accommodating oil. The oil return system for the compressor is characterized in that it further includes an oil return pipe disposed on the outer wall of the compressor housing for communicating the upper cavity and the oil sump, and an oil-gas separation and collection assembly disposed in the upper cavity for guiding oil to the oil return pipe. The oil-gas separation and collection assembly is inclined relative to the horizontal plane, and the lowest point of the oil-gas separation and collection assembly corresponds to the liquid inlet of the oil return pipe.

[0006] Further, the oil-gas separation and collection assembly includes an oil collection frame connected to the inner wall of the compressor housing for the flow of oil supply, an oil collection part disposed inside the oil collection frame, and a plurality of ribs for connecting the oil collection part and the oil collection frame. One end of the rib is connected to the oil collection frame, and the other end is connected to the oil collection part. An orifice for guiding oil to the oil return pipe is further provided at a position corresponding to the oil return pipe on the oil collection frame.

[0007] Further, an oil passage for oil supply and circulation is provided on the side of the oil collecting frame facing upward and inward towards the upper cover.

[0008] Further, the oil collecting frame is connected to the inner wall of the compressor housing with an interference fit.

[0009] Further, the rib is provided with a groove for oil supply and circulation.

[0010] Further, oil holes for connecting the oil return pipe are provided at the positions of the compressor housing corresponding to the upper cavity and at the positions of the compressor housing corresponding to the oil sump; the oil return pipe includes a connection assembly and an intermediate pipe section, and both ends of the intermediate pipe section are connected to the oil holes of the compressor housing through the connection assembly.

[0011] Further, the connection assembly includes a first connector connected to the intermediate pipe section, and a second connector sleeved outside the first connector for connecting the oil hole, and both between the first connector and the second connector and between the second connector and the oil hole are fixed by welding.

[0012] Further, the distance between the oil hole at the position of the compressor housing corresponding to the upper cavity and the motor in the vertical direction is less than 10 mm, and the oil hole at the position of the compressor housing corresponding to the oil sump is located at one-third of the height of the oil sump.

[0013] A compressor includes the oil return system for the compressor described above. The compressor further includes a liquid storage tank communicated with the compressor housing, an upper flange disposed below the motor, the motor is connected with a rotating shaft, the rotating shaft passes through the upper flange and extends into the oil sump, and a cylinder is connected to the rotating shaft below the upper flange; a lower flange is further connected to the lower end of the cylinder.

[0014] An air conditioner includes the compressor described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides an oil return pipe outside the compressor housing to connect the upper cavity and the oil sump inside the compressor housing. At the same time, an oil-gas separation and collection assembly is provided in the upper cavity of the compressor housing. As an auxiliary separation structure, the oil-gas separation and collection assembly can increase the attachment area of oil, improve the effect of oil-gas separation. The oil discharged from the motor of the compressor can flow back to the oil sump through the oil return pipe, avoiding the situation of oil shortage in the compressor due to excessive oil discharge, thus avoiding the problem of wear of compressor parts caused by less oil or lack of oil during the operation of the compressor, extending the service life of the compressor, and improving the reliability of the compressor. Description of the Drawings

[0017] Figure 1Schematic diagram of an oil return system for a compressor provided by the present invention.

[0018] Figure 2 is Figure 1 Enlarged view of part A of

[0019] Figure 3 Top view of the oil-gas separation and collection component 5 of the present invention.

[0020] Figure 4 is Figure 3 B-B cross-sectional view of the oil collecting frame in

[0021] Figure 5 is Figure 3 C-C cross-sectional view of the rib in

[0022] The figure includes:

[0023] Compressor housing 1, upper cover 11, lower cover 12, upper cavity 13, oil sump 14, oil hole 15, liquid storage tank 2, motor 3, upper flange 31, rotating shaft 32, cylinder 33, lower flange 36, oil return pipe 4, oil-gas separation and collection component 5, oil collecting frame 51, oil collecting part 52, groove 53, rib 54, mouth part 55, oil passage 56, connection component 41, first connection piece 411, second connection piece 412, intermediate pipe section 42. Specific embodiments

[0024] To facilitate those skilled in the art to understand the present invention, the present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0025] Referring to Figures 1 to 5 , an oil return system for a compressor provided by the present invention includes a compressor housing 1, a motor 3 disposed inside the compressor housing, and the oil return system for the compressor further includes an upper cover 11 disposed at the upper end of the compressor housing 1 and a lower cover 12 disposed at the bottom of the compressor housing 1. The space between the upper cover 11 and the motor 3 forms the upper cavity 13 of the compressor. The lower cover 12 and the compressor housing 1 form an oil sump 14 for accommodating oil. The upper cavity 13 and the oil sump 14 are connected by an oil return pipe 4 disposed on the outer wall of the compressor housing 1. An oil-gas separation and collection component 5 for guiding oil to the oil return pipe 4 is disposed in the upper cavity 13. The oil-gas separation and collection component 5 is inclined with respect to the horizontal plane (in this embodiment, the compressor housing 1 is generally circular tubular, and the horizontal plane is also the radial plane of the compressor housing 1), and the lowest point of the oil-gas separation and collection component 5 corresponds to the liquid inlet of the oil return pipe 4. Since the oil-gas separation and collection component 5 is inclined with respect to the horizontal plane, when the oil adheres to the oil-gas separation and collection component 5, it can flow towards the liquid inlet of the oil return pipe 4 under the action of gravity.

[0026] The oil-gas separation and collection assembly 5 includes an oil collection frame 51 connected to the inner wall of the compressor housing 1 for the flow of supplied oil, an oil collection part 52 arranged inside the oil collection frame 51, and a plurality of ribs 54 are further arranged between the oil collection frame 51 and the oil collection part 52. One end of the rib 54 is connected to the oil collection frame 51, and the other end is connected to the oil collection part 52. At the corresponding position of the oil collection frame 51 and the oil return pipe 4, there is also an orifice 55 for guiding oil to the oil return pipe 4. In this embodiment, the rib 54 is provided with a groove 53 for the flow of supplied oil. In this embodiment, from a top view, the oil collection part 52 is specifically arranged at the central position inside the oil collection frame 41. The oil collection part 52 is generally circular, and its top surface is recessed downward to form an arc-shaped concave surface.

[0027] On the side of the oil collection frame facing the upper cover and facing inward, there is an oil passage 56 for the flow of supplied oil. The width of the oil passage 56 (that is, Figure 4 the width in the left-right direction) is 10 - 20 mm. Such a width can ensure the overall thickness, ensure the reliability of the hot sleeve process with the housing, and avoid interference with the lead wires and other components. During the process of collecting oil, in this embodiment, the width of the oil passage 56 is 20 mm, and the oil passage 56 is arc-shaped. The oil collection frame 51 is connected to the inner wall of the compressor housing 1 with an interference fit, which can make the oil collection frame 51 and the compressor housing 1 clamped tightly and not easily slide or fall off.

[0028] At the positions of the compressor housing 1 corresponding to the upper cavity 13 and the positions of the compressor housing 1 corresponding to the oil sump 14, there are oil holes 15 for connecting the oil return pipe 4; the oil return pipe 4 includes a connection assembly and an intermediate pipe section 42. Both ends of the intermediate pipe section 42 are connected to the oil holes 15 of the compressor housing 1 through the connection assembly 41. In this embodiment, the intermediate pipe section 42 of the oil return pipe 4 is generally in a "U" shape, and its two ends can be conveniently connected to the compressor housing 1.

[0029] The connection assembly 41 includes a first connector 411 connected to the intermediate pipe section 42, and a second connector 412 sleeved outside the first connector for connecting to the oil hole. And both between the first connector 411 and the second connector 412 and between the second connector 412 and the oil hole 15 are fixed by welding.

[0030] The distance between the oil hole 15 corresponding to the upper cavity 13 of the compressor housing 1 and the motor in the vertical direction is less than 10 mm. In this embodiment, it is set at 5 mm. If the size of the oil hole 15 at the position of the upper cavity 13 is too high, it will cause an increase in the overall size of the compressor. The oil hole corresponding to the oil sump 14 of the compressor housing 1 is located at one-third of the height of the oil sump 14. During use, the liquid level height of the oil generally does not exceed one-third. Such a setting enables the oil to flow into the oil sump 14 well. The position of the oil hole 15 and the size (aperture, length) of the oil return pipe 4 can be flexibly set according to the sizes of other components of the compressor and the position of the upper cavity.

[0031] The inclination angle of the oil-gas separation and collection assembly 5 with respect to the horizontal plane is an acute angle, specifically any degree between 15° and 60°. During specific implementation, the inclination angle of the oil-gas separation and collection assembly 5 can be adjusted according to specific product requirements.

[0032] During specific operation, when the motor 3 rotates at a high speed, it throws the oil onto the compressor housing 1 and the oil-gas separation and collection assembly 5. The oil-gas separation and collection assembly 5 can increase the adhesion area of the oil. As an auxiliary separation structure, it collects the oil in the upper cavity 13 of the compressor. After the oil adheres to the oil-gas separation and collection assembly 5, it flows into the oil hole 15 through the oil collection frame 51, flows into the oil return pipe 4 from the oil hole 15, and returns to the oil sump 14, thereby improving the oil-gas separation effect.

[0033] The present invention also provides a compressor, which includes the oil return system for the compressor described above, and also includes a liquid storage tank 2 communicated with the compressor housing 1, an upper flange 31 arranged below the motor, a rotating shaft 32 connected to the rotor of the motor 3. The motor and the oil sump are separated by the upper flange (that is, the space between the upper flange, the compressor housing, and the lower cover forms the oil sump). The rotating shaft passes through the upper flange and extends downward. A cylinder 33 is connected to the rotating shaft, and a lower flange 36 is connected to the lower end of the cylinder. In this embodiment, two cylinders are provided. The liquid storage tank and the compressor housing are communicated through two connecting pipes, and the two connecting pipes respectively correspond to the two cylinders.

[0034] In addition, the present invention also provides an air conditioner, which includes the compressor described above.

[0035] In the present invention, an oil return pipe is provided outside the compressor housing to connect the upper cavity inside the compressor housing with the oil sump. At the same time, an oil-gas separation and collection assembly is provided in the upper cavity of the compressor housing. As an auxiliary separation structure, the oil-gas separation and collection assembly can increase the adhesion area of oil, improve the effect of oil-gas separation. The oil discharged by the motor of the compressor can flow back to the oil sump through the oil return pipe, avoiding the situation of oil shortage in the compressor due to excessive oil discharge, thereby avoiding the problem of wear of compressor parts caused by less oil or lack of oil during the operation of the compressor, extending the service life of the compressor, and improving the reliability of the compressor.

[0036] In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] In addition, terms such as "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0038] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Although the description of the present invention is made in combination with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included within the scope of the appended claims.

Claims

1. An oil return system for a compressor, comprising a compressor housing, a motor disposed inside the compressor housing, an upper cover disposed at the upper end of the compressor housing, and a lower cover disposed at the bottom of the compressor housing. The space between the upper cover and the motor forms the upper chamber of the compressor, and the space between the lower cover and the compressor housing forms an oil sump for containing oil. It is characterized in that, The oil return system for the compressor further includes an oil return pipe disposed on the outer wall of the compressor housing for communicating the upper chamber and the oil sump, and an oil-gas separation and collection assembly disposed in the upper chamber for guiding oil to the oil return pipe. The oil-gas separation and collection assembly is inclined relative to the horizontal plane, and the lowest point of the oil-gas separation and collection assembly corresponds to the liquid inlet of the oil return pipe. The oil-gas separation and collection assembly includes an oil collection frame connected to the inner wall of the compressor housing for oil supply and flow, an oil collection portion disposed inside the oil collection frame, and a plurality of ribs for connecting the oil collection portion and the oil collection frame. One end of the rib is connected to the oil collection frame, and the other end is connected to the oil collection portion; an opening for guiding oil to the oil return pipe is further provided at a position corresponding to the oil return pipe on the oil collection frame.

2. The oil return system for a compressor according to claim 1, characterized in that, An oil passage for oil supply and flow is provided on the side of the oil collection frame facing the upper cover and facing inward.

3. The oil return system for a compressor according to claim 1, characterized in that, The oil collection frame is connected to the inner wall of the compressor housing by interference fit.

4. The oil return system for a compressor according to claim 1, characterized in that, The rib is provided with a groove for oil supply and flow.

5. The oil return system for a compressor according to claim 1, characterized in that, Oil holes for communicating the oil return pipe are provided at positions corresponding to the upper chamber and the oil sump on the compressor housing; the oil return pipe includes a connection assembly and an intermediate pipe section, and both ends of the intermediate pipe section are connected to the oil holes of the compressor housing through the connection assembly.

6. The oil return system for a compressor according to claim 5, characterized in that, The connection assembly includes a first connector connected to the intermediate pipe section, and a second connector sleeved outside the first connector for connecting the oil hole, and both between the first connector and the second connector and between the second connector and the oil hole are fixed by welding.

7. The oil return system for a compressor according to claim 5, characterized in that, The distance between the oil hole at the position corresponding to the upper chamber on the compressor housing and the motor in the vertical direction is less than 10 mm, and the oil hole at the position corresponding to the oil sump on the compressor housing is located at one-third of the height of the oil sump.

8. A compressor, characterized in that, Including the oil return system for the compressor according to any one of claims 1-7, the compressor further includes a liquid storage tank communicated with the compressor housing, an upper flange disposed below the motor, the motor is connected with a rotating shaft, the rotating shaft passes through the upper flange and extends into the oil sump, and a cylinder is connected to the rotating shaft below the upper flange; a lower flange is further connected to the lower end of the cylinder.

9. An air conditioner, characterized in that, Including the compressor according to claim 8.

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