A gas guide oil return cover and compressor

Abstract

This invention relates to a gas guide and oil return cover and a compressor. The gas guide and oil return cover includes a cover body, which is a frustoconical structure with a hollow interior and open at both ends. The two ends of the cover body along its axial direction are a flange end and a return end, respectively. The flange end is used to connect to the inner wall of the compressor housing. The inner diameter of the return end is smaller than the inner diameter of the flange end. The cover body is inclined from the flange end towards the return end. Several gas guide sections are protruding on the inner inclined surface of the cover body, and gas guide holes are opened through each gas guide section. The several gas guide sections are distributed at intervals along the circumferential direction. Two adjacent gas guide sections and the inner inclined surface of the cover body together form an oil return section, which is connected to the return end. The gas guide and oil return cover and compressor of this invention improve the airflow path of the refrigerant to reduce the oil return resistance inside the compressor, and simultaneously improve the oil return channel of the refrigerant to improve the reliability of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a gas guide oil return cover and a compressor. Background Technology

[0002] A rotary compressor generally includes a housing and a motor and pump body structure coaxially arranged inside the housing. The motor is located above the pump body structure and drives the pump body structure to pump refrigerant via a crankshaft. The motor usually consists of a stator and a rotor. The outer peripheral wall of the stator is fixedly connected to the inner peripheral wall of the housing, and part of the outer peripheral wall of the stator is recessed inward to form an oil return channel for the refrigeration oil to fall back.

[0003] However, since there is no obstruction between the pump body structure and the stator, when the pump body structure is operating, the refrigerant gas discharged upward by the pump body structure can easily blow directly into the oil return channel between the stator and the housing, causing blockage or closure of the oil return channel. This prevents the refrigerant oil above the stator from smoothly returning to the bottom of the housing through the oil return channel, resulting in a lack of oil at the bottom of the housing, thus affecting the operation of the pump body structure. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide a gas guide oil return cover and compressor. According to the embodiments of the present invention, the gas guide oil return cover and compressor reduce the oil return resistance of the compressor by improving the airflow path of the refrigerant, and at the same time improve the oil return channel of the refrigerant to improve the reliability of the compressor.

[0005] To achieve the above objectives, a first aspect of the present invention provides a gas guide and oil return cover, including a cover body. The cover body is a frustum-shaped structure with a hollow interior and open at both ends. The two ends of the cover body along its axial direction are a flange end and a return end, respectively. The flange end is used to connect to the inner wall of the compressor housing. The inner diameter of the return end is smaller than the inner diameter of the flange end. The cover body is inclined from the flange end toward the return end.

[0006] Several air guides are raised on the inner inclined surface of the cover, and air guide holes are opened through the air guides; the several air guides are distributed at intervals along the circumference, and two adjacent air guides together with the inner inclined surface of the cover form an oil return section, which is connected to the return end.

[0007] Therefore, according to the embodiment of the present invention, the gas guide and oil return cover adopts a frustoconical design and is provided with a flange end with a larger inner diameter. This flange end is used to abut against the inner wall of the compressor housing to form a fixed connection, while the return end with a smaller inner diameter is used for the return and collection of refrigeration oil. Specifically, a number of spaced gas guides are formed on the inner inclined surface of the cover, and gas guide holes are opened on the gas guides for the refrigerant gas flow to pass through. In this way, the airflow blown out from the compression structure will not blow directly into the channel between the electric component and the housing, but will pass through the gas guide holes on the gas guides to improve the airflow path and reduce the oil return resistance of the refrigeration oil inside the compressor. At the same time, the oil return section formed by two adjacent gas guides and the inner inclined surface of the cover can quickly recover the refrigeration oil above the cover under the action of the inclined surface and return it to the return end of the cover through a number of oil return sections, and finally fall onto the compression structure to improve the reliability of the compressor. In other words, the air guide and oil return cover according to the embodiments of the present invention can effectively improve the airflow path of the refrigerant to reduce the oil return resistance of the refrigeration oil inside the compressor, and at the same time improve the oil return channel of the refrigeration oil to improve the reliability of the compressor.

[0008] In one embodiment, the included angle between the oil return section and the inner wall of the compressor housing is β, where 5°≤β≤80°.

[0009] In one implementation, β satisfies the relationship: β = 45°.

[0010] In one embodiment, the flange end has a flange portion protruding in the axial direction of the cover away from the return end, and the flange portion is used to connect with the inner wall of the compressor housing.

[0011] In one embodiment, the cover is a truncated cone structure that is hollow inside and open at both ends, and several of the air guide parts are distributed at equal intervals along the circumference.

[0012] In one embodiment, the end of the air guide near the return end is connected to the port edge of the return end.

[0013] In one embodiment, two air guide holes are provided through the air guide section.

[0014] In one embodiment, the shape of the air guide hole is one of a circle, an ellipse, or a polygon.

[0015] A second aspect of this invention provides a compressor, including a housing, an electric component built into the inner wall of the housing, and a compression structure. It also includes a gas guide and oil return cover as described in any of the preceding embodiments. The electric component is located above the compression structure and is used to drive the compression structure to perform compression operations. The gas guide and oil return cover is disposed between the electric component and the compression structure. The flange end is connected to the inner wall of the housing, and the return end is arranged close to the compression structure, with a spacing between the return ends above the compression structure. According to the compressor of this invention, by improving the refrigerant airflow path to reduce the oil return resistance of the refrigeration oil inside the compressor, and simultaneously improving the oil return channel of the refrigeration oil to improve the reliability of the compressor.

[0016] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of the air guide and oil return cover according to an embodiment of the present invention;

[0018] Figure 2 This is a second schematic diagram of the structure of the air guide and oil return cover according to an embodiment of the present invention;

[0019] Figure 3 This is the third schematic diagram of the structure of the air guide and oil return cover according to an embodiment of the present invention;

[0020] Figure 4 for Figure 3 The cross-sectional diagram along the AA direction is shown below;

[0021] Figure 5 This is one of the schematic diagrams showing the connection between the gas guide and oil return cover and the compressor housing in an embodiment of the present invention;

[0022] Figure 6 This is the fourth schematic diagram of the structure of the air guide and oil return cover according to an embodiment of the present invention;

[0023] Figure 7 This is the fifth schematic diagram of the structure of the air guide and oil return cover according to an embodiment of the present invention;

[0024] Figure 8 This is the sixth schematic diagram of the structure of the air guide and oil return cover according to an embodiment of the present invention;

[0025] Figure 9 for Figure 8 The cross-sectional diagram along the BB direction is shown below;

[0026] Figure 10 This is a second schematic diagram showing the connection between the gas guide and oil return cover and the compressor housing in an embodiment of the present invention;

[0027] Figure 11This is a schematic diagram of the compressor structure according to an embodiment of the present invention;

[0028] Figure 12 This is a cross-sectional schematic diagram of the compressor according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10. Cover; 11. Flange end; 12. Return end; 13. Air guide section; 14. Air guide hole; 15. Oil return section; 20. Compressor; 21. Housing; 22. Electric components; 23. Compression structure; 24. Crankshaft. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention.

[0032] In related technologies, rotary compressors generally include a housing and a motor and pump body structure coaxially mounted within the housing. The motor is positioned above the pump body structure and drives the pump body structure to pump refrigerant via a crankshaft. The motor typically consists of a stator and a rotor, with the outer peripheral wall of the stator fixedly connected to the inner peripheral wall of the housing. A portion of the outer peripheral wall of the stator is recessed inward to form an oil return channel for the refrigerant oil to fall back. However, because there is no obstruction between the pump body structure and the stator, when the pump body structure is operating, the refrigerant gas discharged upward by the pump body structure can easily be blown directly into the oil return channel between the stator and the housing, causing blockage or closure of the oil return channel. This prevents the refrigerant oil above the stator from smoothly falling back to the bottom of the housing through the oil return channel, resulting in oil shortage at the bottom of the housing, thus affecting the operation of the pump body structure.

[0033] In view of this, embodiments of the present invention provide a gas guide and oil return cover and a compressor. According to embodiments of the present invention, the gas guide and oil return cover and compressor reduce the oil return resistance of the refrigeration oil inside the compressor by improving the airflow path of the refrigerant, and at the same time improve the oil return channel of the refrigeration oil to improve the reliability of the compressor.

[0034] Please see Figures 1 to 10The first aspect of this invention provides a gas guide and oil return cover, including a cover body 10. The cover body 10 is a frustoconical structure with a hollow interior and open at both ends. The two ends of the cover body 10 along its axial direction are a flange end 11 and a return end 12, respectively. The flange end 11 is used to connect to the inner wall of the housing 21 of the compressor 20. The inner diameter of the return end 12 is smaller than the inner diameter of the flange end 11. The cover body 10 is inclined from the flange end 11 toward the return end 12. A plurality of gas guide portions 13 are protruding on the inner inclined surface of the cover body 10, and gas guide holes 14 are opened through the gas guide portions 13. The plurality of gas guide portions 13 are distributed at intervals along the circumferential direction. Two adjacent gas guide portions 13 and the inner inclined surface of the cover body 10 together form an oil return portion 15, which is connected to the return end 12. The end of the gas guide portion 13 near the return end 12 is connected to the port edge of the return end 12.

[0035] Therefore, according to the embodiment of the present invention, the gas guide and oil return cover 10 adopts a frustoconical design and is provided with a flange end 11 with a larger inner diameter. The flange end 11 is used to abut against the inner wall of the housing 21 of the compressor 20 to form a fixed connection, while the return end 12 with a smaller inner diameter is used for the return and collection of refrigeration oil. Specifically, a plurality of spaced gas guide portions 13 are formed on the inner inclined surface of the cover 10, and gas guide holes 14 are opened on the gas guide portions 13 for the refrigerant gas flow to pass through. In this way, the airflow blown out from the compression structure 23 will not Instead of blowing directly into the channel between the electric component 22 and the housing 21, the refrigerant passes through the air guide holes 14 on the air guide section 13 to improve the airflow path and reduce the oil return resistance of the refrigerant oil inside the compressor 20. Simultaneously, the oil return section 15 formed by two adjacent air guide sections 13 and the inner inclined surface of the cover 10 allows the refrigerant oil above the cover 10 to be quickly recovered and returned to the return end 12 of the cover 10 via several oil return sections 15, ultimately falling onto the compression structure 23, thereby improving the reliability of the compressor 20. In other words, the air guide and oil return cover according to this embodiment of the invention can effectively improve the refrigerant airflow path to reduce the oil return resistance of the refrigerant oil inside the compressor 20, and also improve the oil return channel to enhance the reliability of the compressor 20.

[0036] Specifically, in this embodiment of the invention, the included angle between the oil return section 15 and the inner wall of the housing 21 of the compressor 20 is β, where 5°≤β≤80°. This can be understood as follows: when the oil return shroud of this embodiment of the invention is connected to the inner wall of the housing 21 of the compressor 20, it is located between the electric component 22 and the compression structure 23 of the compressor 20. The return end 12 of the shroud 10 is positioned above the compression structure 23, so that the refrigerant oil is collected and returned from the shroud 10, and finally introduced into the compression structure 23 via the return end 12. Furthermore, the return end 12 can also serve as a channel for the crankshaft 24 to pass through, preventing it from obstructing the operation of the crankshaft 24. Furthermore, by limiting the range of the included angle β formed by the oil return section 15 and the inner wall of the housing 21 of the compressor 20 to 5°≤β≤80°, the inclined design can increase the guiding and collecting effect of the refrigeration oil. At the same time, the high-pressure gas discharged from the compression structure 23 will not obstruct the refrigeration oil on the oil return section 15, which can better improve the return efficiency of the refrigeration oil.

[0037] Optionally, in some embodiments of the present invention, the cover 10 is a hollow, open-ended truncated cone structure, with several air guides 13 evenly distributed along the circumference. It can be understood that in these embodiments, the cover 10 is a truncated cone structure that is larger at the top and smaller at the bottom. This structural design can block the high-speed gas blown out by the compression structure 23 through the outer wall of the cover 10, and improve the gas path through the air guide holes 14 of the air guides 13, effectively preventing high-speed gas from directly spraying into the oil passage between the electric component 22 and the compressor housing 21, thereby greatly reducing the backflow resistance of the refrigeration oil.

[0038] Optionally, in some embodiments of the present invention, the flange end 11 protrudes a flange portion in the axial direction of the cover 10 away from the return end 12, and the flange portion is used to connect with the inner wall of the housing 21 of the compressor 20.

[0039] Optionally, in some embodiments of the present invention, the shape of the air guide hole 14 is one of a circle, an ellipse, or a polygon.

[0040] The following is combined with Figures 1 to 5 A specific embodiment of the air guide and oil return cover according to the present invention will be described in detail below. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0041] like Figures 1 to 5As shown, the air guide and oil return cover of this embodiment includes a cover body 10. The cover body 10 is a frustoconical structure with a hollow interior and open at both ends. The two ends of the cover body 10 along its axial direction are a flange end 11 and a return end 12, respectively. The flange end 11 is used to connect with the inner wall of the housing 21 of the compressor 20. The inner diameter of the return end 12 is smaller than the inner diameter of the flange end 11. The cover body 10 is inclined from the flange end 11 toward the return end 12. A plurality of air guide parts 13 are protruding on the inner inclined surface of the cover body 10, and air guide holes 14 are opened through the air guide parts 13. The plurality of air guide parts 13 are distributed at intervals along the circumferential direction. Two adjacent air guide parts 13 and the inner inclined surface of the cover body 10 together form an oil return part 15, which is connected to the return end 12. The end of the air guide part 13 near the return end 12 is connected to the port edge of the return end 12.

[0042] Specifically, in this embodiment, the included angle between the oil return section 15 and the inner wall of the housing 21 of the compressor 20 is β, where β = 45°. Furthermore, the cover 10 is a hollow, open-ended frustum-shaped structure, with several air guide sections 13 evenly spaced along the circumference. Each air guide section 13 has an elliptical air guide hole 14.

[0043] Furthermore, in this embodiment, the flange end 11 protrudes a flange portion along the axial direction of the cover 10 in a direction away from the return end 12, and the flange portion is used to connect with the inner wall of the housing 21 of the compressor 20.

[0044] The following is combined with Figures 1 to 5 A specific embodiment of the air guide and oil return cover according to the present invention will be described in detail below. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0045] like Figures 1 to 5 As shown, the air guide and oil return cover of this embodiment includes a cover body 10. The cover body 10 is a frustoconical structure with a hollow interior and open at both ends. The two ends of the cover body 10 along its axial direction are a flange end 11 and a return end 12, respectively. The flange end 11 is used to connect with the inner wall of the housing 21 of the compressor 20. The inner diameter of the return end 12 is smaller than the inner diameter of the flange end 11. The cover body 10 is inclined from the flange end 11 toward the return end 12. A plurality of air guide parts 13 are protruding on the inner inclined surface of the cover body 10, and air guide holes 14 are opened through the air guide parts 13. The plurality of air guide parts 13 are distributed at intervals along the circumferential direction. Two adjacent air guide parts 13 and the inner inclined surface of the cover body 10 together form an oil return part 15, which is connected to the return end 12. The end of the air guide part 13 near the return end 12 is connected to the port edge of the return end 12.

[0046] Specifically, in this embodiment, the included angle between the oil return section 15 and the inner wall of the housing 21 of the compressor 20 is β, where β = 5°. Furthermore, the cover 10 is a hollow, open-ended frustum-shaped structure, with several air guide sections 13 evenly spaced along the circumference. Each air guide section 13 has an elliptical air guide hole 14.

[0047] Furthermore, in this embodiment, the flange end 11 protrudes a flange portion along the axial direction of the cover 10 in a direction away from the return end 12, and the flange portion is used to connect with the inner wall of the housing 21 of the compressor 20.

[0048] The following is combined with Figures 1 to 5 A specific embodiment of the air guide and oil return cover according to the present invention will be described in detail below. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0049] like Figures 1 to 5 As shown, the air guide and oil return cover of this embodiment includes a cover body 10. The cover body 10 is a frustoconical structure with a hollow interior and open at both ends. The two ends of the cover body 10 along its axial direction are a flange end 11 and a return end 12, respectively. The flange end 11 is used to connect with the inner wall of the housing 21 of the compressor 20. The inner diameter of the return end 12 is smaller than the inner diameter of the flange end 11. The cover body 10 is inclined from the flange end 11 toward the return end 12. A plurality of air guide parts 13 are protruding on the inner inclined surface of the cover body 10, and air guide holes 14 are opened through the air guide parts 13. The plurality of air guide parts 13 are distributed at intervals along the circumferential direction. Two adjacent air guide parts 13 and the inner inclined surface of the cover body 10 together form an oil return part 15, which is connected to the return end 12. The end of the air guide part 13 near the return end 12 is connected to the port edge of the return end 12.

[0050] Specifically, in this embodiment, the included angle between the oil return section 15 and the inner wall of the housing 21 of the compressor 20 is β, where β = 80°. Furthermore, the cover 10 is a hollow, open-ended frustum-shaped structure, with several air guide sections 13 evenly spaced along the circumference. Each air guide section 13 has an elliptical air guide hole 14.

[0051] Furthermore, in this embodiment, the flange end 11 protrudes a flange portion along the axial direction of the cover 10 in a direction away from the return end 12, and the flange portion is used to connect with the inner wall of the housing 21 of the compressor 20.

[0052] The following is combined with Figures 6 to 10 A specific embodiment of the air guide and oil return cover according to the present invention will be described in detail below. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0053] like Figures 6 to 10As shown, the air guide and oil return cover of this embodiment includes a cover body 10. The cover body 10 is a frustoconical structure with a hollow interior and open at both ends. The two ends of the cover body 10 along its axial direction are a flange end 11 and a return end 12, respectively. The flange end 11 is used to connect with the inner wall of the housing 21 of the compressor 20. The inner diameter of the return end 12 is smaller than the inner diameter of the flange end 11. The cover body 10 is inclined from the flange end 11 toward the return end 12. A plurality of air guide parts 13 are protruding on the inner inclined surface of the cover body 10, and air guide holes 14 are opened through the air guide parts 13. The plurality of air guide parts 13 are distributed at intervals along the circumferential direction. Two adjacent air guide parts 13 and the inner inclined surface of the cover body 10 together form an oil return part 15, which is connected to the return end 12. The end of the air guide part 13 near the return end 12 is connected to the port edge of the return end 12.

[0054] Specifically, in this embodiment, the included angle between the oil return section 15 and the inner wall of the housing 21 of the compressor 20 is β, where β = 45°. Furthermore, the cover 10 is a hollow, open-ended frustum-shaped structure, with several air guide sections 13 evenly spaced along the circumference. Each air guide section 13 has two air guide holes 14 of different sizes, both of which are circular.

[0055] Furthermore, in this embodiment, the flange end 11 protrudes a flange portion along the axial direction of the cover 10 in a direction away from the return end 12, and the flange portion is used to connect with the inner wall of the housing 21 of the compressor 20.

[0056] like Figure 11 and Figure 12 As shown, a second aspect of the present invention provides a compressor 20, including a housing 21, an electric component 22 built into the inner wall of the housing 21, and a compression structure 23, and further including a gas guide and oil return cover as in any of the above embodiments. The electric component 22 is located above the compression structure 23 and is used to drive the compression structure 23 to perform compression operations. The gas guide and oil return cover is disposed between the electric component 22 and the compression structure 23, with a flange end 11 connected to the inner wall of the housing 21, and a return end 12 arranged close to the compression structure 23, and the return ends 12 are spaced apart above the compression structure 23. According to the compressor 20 of the present invention, by improving the airflow path of the refrigerant, the oil return resistance of the refrigeration oil inside the compressor 20 is reduced, and the oil return channel of the refrigeration oil is improved to improve the reliability performance of the compressor 20.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting this invention.

[0058] The above embodiments only illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention's gas guide and oil return cover and compressor. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A gas guide and oil return cover, applied to a compressor, characterized in that: The device includes a cover, which is a frustum-shaped structure that is hollow inside and open at both ends. The two ends of the cover along its axial direction are a flange end and a return end, respectively. The flange end is used to connect to the inner wall of the compressor housing. The inner diameter of the return end is smaller than the inner diameter of the flange end. The cover is inclined from the flange end toward the return end. Several air guides are raised on the inner inclined surface of the cover, and air guide holes are opened through the air guides; the several air guides are distributed at intervals along the circumference, and two adjacent air guides together with the inner inclined surface of the cover form an oil return section, which is connected to the return end.

2. The air guide and oil return cover according to claim 1, characterized in that: The included angle between the oil return section and the inner wall of the compressor housing is β, where 5°≤β≤80°.

3. The air guide and oil return cover according to claim 1, characterized in that: The β satisfies the relationship: β = 45°.

4. The air guide and oil return cover according to claim 1, characterized in that: The flange end has a flange portion protruding in the axial direction of the cover body away from the return end, and the flange portion is used to connect with the inner wall of the compressor housing.

5. The air guide and oil return cover according to claim 1, characterized in that: The cover is a truncated cone structure that is hollow inside and open at both ends, and several of the air guide parts are distributed at equal intervals along the circumference.

6. The air guide and oil return cover according to claim 1, characterized in that: The end of the air guide near the return end is connected to the port edge of the return end.

7. The air guide and oil return cover according to claim 1, characterized in that: Two air guide holes are provided through the air guide section.

8. The air guide and oil return cover according to claim 1, characterized in that: The shape of the air guide hole can be one of the following: circular, elliptical, or polygonal.

9. A compressor, characterized in that: The device includes a housing, an electric component built into the inner wall of the housing, and a compression structure, and further includes a gas guide and oil return cover as described in any one of claims 1 to 8, wherein the electric component is located above the compression structure and is used to drive the compression structure to perform compression operations; The air guide and oil return cover is disposed between the electric component and the compression structure. The flange end is connected to the inner wall of the housing. The return end is arranged close to the compression structure and is spaced above the compression structure.

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