Two-way oil return structure and scroll compressor

Abstract

This invention relates to the field of power machinery technology, and provides a bidirectional oil return structure and a scroll compressor. In this structure, the end face of one axial end of the stationary scroll and the end cover form an exhaust chamber. The other axial end of the stationary scroll meshes with the moving scroll to form a low-pressure chamber and a high-pressure chamber. The high-pressure chamber and the exhaust chamber are connected through a first exhaust port. A scroll groove is formed on the axial end face of the stationary scroll facing the moving scroll, and the center end of the scroll groove is connected to the exhaust chamber through a first drainage channel. An intermediate body is located at the end of the moving scroll opposite to the stationary scroll, forming a back pressure chamber between the intermediate body and the moving scroll. The back pressure chamber is connected to the exhaust chamber through a second drainage channel. A housing is fitted over the intermediate body, and an intake chamber connected to the low-pressure chamber is formed inside the housing. The tail end of the scroll groove is connected to the intake chamber through a second exhaust port in the intermediate body. This allows the refrigerant oil in the compressor's exhaust chamber to return bidirectionally to the intake chamber and the back pressure chamber, resulting in better lubrication and sealing of the compressor's moving parts.

Description

Technical Field

[0001] This invention relates to the field of power machinery technology, and in particular to a bidirectional oil return structure and a scroll compressor. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas; it is the heart of a refrigeration system. It draws in low-temperature, low-pressure refrigerant gas through the suction pipe, compresses it using a piston driven by a motor, and then discharges high-temperature, high-pressure refrigerant gas through the discharge pipe, providing power for the refrigeration cycle.

[0003] Refrigeration oil plays a crucial role in compressors. It lubricates various friction pairs, reducing wear on components; it exists between moving surfaces or bearings, ensuring sealing performance during gas compression; and it also has cooling, cleaning, and rust-preventing effects.

[0004] However, as the compressor operates, some refrigerant oil will be discharged into the exhaust chamber along with the high-pressure air. Generally, there are no moving parts installed in the exhaust chamber, so the refrigerant oil entering the exhaust chamber can only accumulate at the bottom of the exhaust chamber and wait to be cleaned. As the refrigerant oil decreases, the friction between the moving parts in the suction chamber and back pressure chamber gradually increases, causing the compressor to experience insufficient discharge, overheating, or wear of parts.

[0005] To address this, some existing compressors are designed with an oil return structure, which can redirect the refrigeration oil in the exhaust chamber back into a designated cavity to lubricate its internal moving parts. However, during use, it has been found that after a period of use, the compressor often experiences localized overheating and high wear rates on local moving parts. The reason for this is that the scroll compressor has a simple oil return structure, equipped with only a one-way oil return channel, resulting in uneven distribution of refrigeration oil and significant differences in lubrication between different parts, thus affecting the compressor's operating performance.

[0006] Therefore, there is an urgent need for a bidirectional oil return structure and a scroll compressor to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to propose a bidirectional oil return structure and a scroll compressor, which enables the refrigerant oil in the compressor's exhaust chamber to return to the intake chamber and the back pressure chamber simultaneously in both directions, thereby providing better lubrication and sealing for the compressor's moving parts.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] The bidirectional oil return structure includes:

[0010] End cap;

[0011] A stationary vortex disk and a moving vortex disk are provided. The end face of one axial end of the stationary vortex disk forms an exhaust chamber with the end cover. The moving vortex disk is eccentrically sleeved inside the stationary vortex disk, and the other axial end of the stationary vortex disk meshes with the moving vortex disk to form a low-pressure chamber and a high-pressure chamber. The high-pressure chamber and the exhaust chamber are connected through a first exhaust hole. A vortex groove is provided on the axial end face of the stationary vortex disk facing the moving vortex disk. The center end of the vortex groove is connected to the exhaust chamber through a first drainage channel.

[0012] An intermediate body is located at one end of the moving vortex disk opposite to the stationary vortex disk and is coaxially arranged with the stationary vortex disk. A back pressure cavity is formed between the intermediate body and the moving vortex disk. The back pressure cavity is connected to the exhaust cavity through a second drainage channel.

[0013] The housing is fitted onto the intermediate body. An air intake chamber communicating with the low-pressure chamber is provided inside the housing. The tail end of the vortex groove communicates with the air intake chamber through a second exhaust port provided in the intermediate body.

[0014] As a preferred technical solution of the above-mentioned bidirectional oil return structure, the stationary vortex disk is provided with a vortex tooth protruding on the side facing the moving vortex disk, the vortex groove is opened on the tooth tip of the vortex tooth, and along the axial direction of the stationary vortex disk, the end face of the tooth tip of the vortex tooth abuts against the end face of the moving vortex disk.

[0015] As a preferred technical solution of the above-mentioned bidirectional oil return structure, the second flow channel forms a second flow hole on the inner peripheral sidewall of the above-mentioned static vortex disk.

[0016] As a preferred technical solution of the above-mentioned bidirectional oil return structure, the static vortex disk is provided with a third drainage channel in the exhaust chamber. One end of the third drainage channel is closed and the other end is open. The first drainage channel is connected to the exhaust chamber through the third drainage channel. The first drainage channel forms a first drainage hole on the axial end face of the exhaust chamber. In the vertical direction, the opening is located below the first drainage hole.

[0017] As a preferred technical solution of the above-mentioned bidirectional oil return structure, the axial direction of the static vortex disk is parallel to the horizontal direction, the first drainage hole and the second drainage hole are arranged radially spaced along the static vortex disk and vertically, the second drainage hole is located at the bottom of the exhaust chamber.

[0018] As a preferred technical solution of the above-mentioned bidirectional oil return structure, the second flow channel includes a first flow channel opened in the above-mentioned intermediate body and a second flow channel opened in the above-mentioned static vortex disk. The first flow channel is connected to the second flow channel, the first flow channel is connected to the back pressure cavity, and the second flow channel is connected to the second flow hole.

[0019] As a preferred technical solution of the above-mentioned bidirectional oil return structure, the third flow channel includes a U-shaped groove, which is opened on the axial end face of the stationary vortex disk. The end cover is correspondingly provided with a cover plate, which is engaged with the opening end face of the U-shaped groove in the groove depth direction.

[0020] As a preferred technical solution of the above-mentioned bidirectional oil return structure, a boss is provided on the axial end face of the stationary vortex disk in the exhaust chamber. Along the axial direction of the stationary vortex disk, the end face of the boss is flush with the end face of the peripheral sidewall of the stationary vortex disk, and the boss is provided with the above-mentioned U-shaped groove.

[0021] As a preferred technical solution of the above-mentioned bidirectional oil return structure, a thrust plate is sandwiched between the intermediate body and the moving scroll, and the thrust plate causes the moving scroll to have a tendency to move toward the side where the stationary scroll is located.

[0022] A scroll compressor is also provided, including a rotating shaft and the aforementioned bidirectional oil return structure. One end of the rotating shaft passes through the aforementioned intermediate body and is connected to the aforementioned moving scroll. The rotating shaft is rotatably connected to the aforementioned intermediate body through a bearing.

[0023] Beneficial effects of this invention:

[0024] This application provides a bidirectional oil return structure, including an end cap, a stationary vortex disk, a moving vortex disk, an intermediate body, and a shell. The end face of one axial end of the stationary vortex disk forms an exhaust chamber with the end cap. The moving vortex disk is eccentrically fitted inside the stationary vortex disk, and the other axial end of the stationary vortex disk meshes with the moving vortex disk to form a low-pressure chamber and a high-pressure chamber. The high-pressure chamber and the exhaust chamber are connected through a first exhaust port. A vortex groove is formed on the axial end face of the stationary vortex disk facing the moving vortex disk, and the center end of the vortex groove is connected to the exhaust chamber through a first drainage channel. The intermediate body is located at the end of the moving vortex disk opposite to the stationary vortex disk and is coaxially arranged with the stationary vortex disk. A back pressure chamber is formed between the intermediate body and the moving vortex disk, and the back pressure chamber is connected to the exhaust chamber through a second drainage channel. The shell is fitted outside the intermediate body, and an intake chamber connected to the low-pressure chamber is formed inside the shell. The tail end of the vortex groove is connected to the intake chamber through a second exhaust port formed in the intermediate body.

[0025] Under the pressure of the exhaust, some of the oil flows from the first drainage channel into the vortex groove, and along the groove from its center to its tail. It then enters the intake chamber through the second exhaust port in the intermediate body, lubricating the moving components within the intake chamber. Another portion of the refrigeration oil flows from the second drainage channel into the back pressure chamber, lubricating the rotating shaft, moving scroll, and other moving components installed in the back pressure chamber. This allows the refrigeration oil in the compressor's exhaust chamber to simultaneously return to both the intake and back pressure chambers, resulting in better lubrication and sealing of the compressor's moving parts. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the bidirectional oil return structure provided in an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the stationary vortex disk provided in an embodiment of the present invention;

[0029] Figure 3 This is a front view of the static vortex disk provided in an embodiment of the present invention;

[0030] Figure 4 This is a rear view of the stationary vortex disk provided in an embodiment of the present invention;

[0031] Figure 5 This is a front view of the end cap provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 10. End cap; 11. Cover plate;

[0034] 20. Static vortex disk; 21. Exhaust chamber; 22. Low-pressure chamber; 23. High-pressure chamber; 24. First exhaust port; 25. Vortex groove; 251. Center end; 252. Tail end; 26. First drainage channel; 261. First drainage hole; 27. Third drainage channel; 28. Second flow channel; 281. Second drainage hole;

[0035] 30. Moving scroll plate;

[0036] 40. Intermediate body; 41. Back pressure cavity; 42. First flow channel;

[0037] 50. Rotating shaft; 60. Bearing; 70. Thrust plate. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0042] It should be noted that in this embodiment, the scroll compressor operates horizontally, that is, the axial direction of the scroll compressor is parallel to the horizontal direction.

[0043] like Figures 1 to 5As shown, this application provides a bidirectional oil return structure, including an end cap 10, a stationary vortex disk 20, a moving vortex disk 30, an intermediate body 40, and a housing. The end face of the stationary vortex disk 20 at one axial end forms an exhaust chamber 21 with the end cap 10. The moving vortex disk 30 is eccentrically fitted inside the stationary vortex disk 20, and the other axial end of the stationary vortex disk 20 meshes with the moving vortex disk 30 to form a low-pressure chamber 22 and a high-pressure chamber 23. The high-pressure chamber 23 is connected to the exhaust chamber 21 through a first exhaust hole 24. A vortex groove 25 is formed on the axial end face of the stationary vortex disk 20 facing the moving vortex disk 30. The center end 251 of the vortex groove 25 is connected to a first drainage channel 26. It is connected to the exhaust chamber 21; the intermediate body 40 is located at the end of the moving scroll 30 opposite to the stationary scroll 20 and is coaxial with the stationary scroll 20. A back pressure chamber 41 is formed between the intermediate body 40 and the moving scroll 30. The back pressure chamber 41 is connected to the exhaust chamber 21 through the second drainage channel; the shell is sleeved on the outside of the intermediate body 40. An intake chamber connected to the low pressure chamber 22 is opened inside the shell. The tail end 252 of the vortex groove 25 is connected to the intake chamber through the second exhaust hole opened in the intermediate body 40.

[0044] Specifically, one axial end of the stationary scroll 20 engages with the end cover 10 to form an exhaust chamber 21. The moving scroll 30 is eccentrically fitted onto and meshes with the stationary scroll 20. The tail end 252 of the scroll groove 25 in the stationary scroll 20 extends beyond the tooth root of the moving scroll 30. During the operation of the scroll compressor, the tail end 252 is not sealed by the moving scroll 30. The meshing teeth form a high-pressure chamber 23 and a low-pressure chamber 22 that are interconnected. The high-pressure chamber 23 is connected to the exhaust chamber 21 through the first exhaust hole 24 opened in the stationary scroll 20. The intermediate body 40 is located on the moving scroll 30 facing away from the stationary scroll 20. One end is coaxially arranged with the stationary vortex disk 20. A back pressure cavity 41 is formed between the intermediate body 40 and the moving vortex disk 30. The back pressure cavity 41 is connected to the exhaust cavity 21 through a second drainage channel opened between the stationary vortex disk 20 and the intermediate body 40. A second exhaust hole is also opened on the intermediate body 40. One end of the rotating shaft 50 passes through the intermediate body 40 and is connected to the moving vortex disk 30. It is rotatably connected to the intermediate body 40 through the bearing 60. The shell is sleeved outside the intermediate body 40 to form an intake cavity that is connected to the low pressure cavity 22. The intake cavity is connected to the tail end 252 of the vortex groove 25 through the second exhaust hole. When the scroll compressor starts, some of the refrigerant oil in the suction chamber flows into the low-pressure chamber 22. Driven by the driver, the rotating shaft 50 rotates the moving scroll 30. The relative rotation between the moving scroll 30 and the stationary scroll 20 forces the gas and refrigerant oil in the low-pressure chamber 22 into the high-pressure chamber 23. As the volume of the high-pressure chamber 23 is gradually compressed, its internal pressure increases. When the high-pressure chamber 23 connects to the exhaust chamber 21, the high-pressure gas in the high-pressure chamber 23 is discharged into the exhaust chamber 21 through the first exhaust port 24. During this process, some refrigerant oil is carried into the exhaust chamber 21 by the high-pressure gas. Under the exhaust pressure, some oil in the exhaust chamber 21 flows into the scroll groove 25 through the first drainage channel 26 and along the scroll groove 25 from its center end 251 to its tail end 252. It then returns to the suction chamber through the second exhaust port opened in the intermediate body 40, lubricating the moving components located within the suction chamber. Another portion of the refrigerant oil in the exhaust chamber 21 can flow into the back pressure chamber 41 through the second drainage channel to lubricate the rotating shaft 50, the moving scroll 30, and other moving components installed in the back pressure chamber 41. In this way, the refrigerant oil in the compressor exhaust chamber 21 can simultaneously return to both the suction chamber and the back pressure chamber 41 in both directions, resulting in better lubrication and sealing of the compressor's moving parts.

[0045] Specifically, the stationary volute 20 has a volute tooth protruding on the side facing the moving volute 30, and a volute groove 25 is opened at the tooth tip of the volute tooth. Along the axial direction of the stationary volute 20, the end face of the tooth tip of the volute tooth abuts against the end face of the moving volute 30.

[0046] Due to gravity, the refrigerant oil accumulates on one circumferential side of the exhaust chamber 21, specifically at the lowest vertical end. Therefore, to reduce oil accumulation in the exhaust chamber 21, in this embodiment, a second drainage hole 281 is formed on the inner circumferential sidewall of the stationary volute 20. This allows the refrigerant oil to flow more easily into the second drainage channel.

[0047] Optionally, the stationary vortex disk 20 is provided with a third drainage channel 27 in the exhaust chamber 21. One end of the third drainage channel 27 is closed, and the other end is open. The first drainage channel 26 communicates with the exhaust chamber 21 through the third drainage channel 27. The first drainage channel 26 forms a first drainage hole 261 on the axial end face of the exhaust chamber 21. Vertically, the opening is located below the first drainage hole 261. When the level of the refrigerant oil in the exhaust chamber 21 exceeds the opening of the third drainage channel 27, the pressure in the exhaust chamber 21 forces the refrigerant oil into the third drainage channel 27 and into the vortex groove 25 along the first drainage channel 26. In this way, the refrigerant oil can be concentrated and injected into the third drainage channel 27.

[0048] Optionally, the axial direction of the stationary vortex disk 20 is parallel to the horizontal direction, and the first drainage hole 261 and the second drainage hole 281 are arranged radially spaced along the stationary vortex disk 20. In the vertical direction, the second drainage hole 281 is located at the bottom of the exhaust chamber 21.

[0049] Optionally, the second flow channel includes a first flow channel 42 opened in the intermediate body 40 and a second flow channel 28 opened in the stationary vortex plate 20. The first flow channel 42 is connected to the second flow channel 28, the first flow channel 42 is connected to the back pressure chamber 41, and the second flow channel 28 is connected to the second flow hole 281.

[0050] Specifically, the third drainage channel 27 includes a U-shaped groove, which is formed on the axial end face of the stationary vortex disk 20. The end cover 10 is correspondingly provided with a cover plate 11, which is engaged with the opening end face of the U-shaped groove in the groove depth direction. This arrangement makes the third drainage channel 27 easier to disassemble and maintain. After the end cover 10 and the stationary vortex disk 20 are disassembled, the cover plate 11 separates from the U-shaped groove, exposing the inner peripheral wall of the third drainage channel 27 to the outside, making it convenient for cleaning.

[0051] Optionally, a boss is provided on the axial end face of the stationary vortex disk 20 inside the exhaust chamber 21. Along the axial direction of the stationary vortex disk 20, the end face of the boss is flush with the end face of the peripheral side wall of the stationary vortex disk 20, and the boss is provided with a U-shaped groove.

[0052] Optionally, a thrust plate 70 is sandwiched between the intermediate body 40 and the moving scroll 30. The thrust plate 70 abuts against the moving scroll 30 along the axial direction, giving it a tendency to move toward the side where the stationary scroll 20 is located, thereby counteracting the pressure exerted by the high-pressure gas in the high-pressure chamber 23 on the moving scroll 30, causing it to move away from the stationary scroll 20.

[0053] A scroll compressor is also provided, including a rotating shaft 50 and the aforementioned bidirectional oil return structure. One end of the rotating shaft 50 passes through the intermediate body 40 and is connected to the moving scroll 30. The rotating shaft 50 is rotatably connected to the intermediate body 40 through a bearing 60.

[0054] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A bidirectional oil return structure, characterized in that, include: End cap (10); A stationary vortex disk (20) and a moving vortex disk (30) are provided. The end face of one axial end of the stationary vortex disk (20) forms an exhaust chamber (21) with the end cover (10). The moving vortex disk (30) is eccentrically fitted inside the stationary vortex disk (20), and the other axial end of the stationary vortex disk (20) meshes with the moving vortex disk (30) to form a low-pressure chamber (22) and a high-pressure chamber (23). The high-pressure chamber (23) and the exhaust chamber (21) are connected through a first exhaust hole (24). A vortex groove (25) is provided on the axial end face of the stationary vortex disk (20) facing the moving vortex disk (30). The center end (251) of the vortex groove (25) is connected to the exhaust chamber (21) through a first drainage channel (26). The tail end (252) of the vortex groove (25) extends beyond the tooth root range of the moving vortex disk (30). An intermediate body (40) is located at one end of the moving vortex disk (30) opposite to the stationary vortex disk (20) and is coaxially arranged with the stationary vortex disk (20). A back pressure cavity (41) is formed between the intermediate body (40) and the moving vortex disk (30). The back pressure cavity (41) is connected to the exhaust cavity (21) through a second drainage channel. The housing is fitted over the intermediate body (40), and an air intake chamber communicating with the low-pressure chamber (22) is provided inside the housing. The tail end (252) of the vortex groove (25) communicates with the air intake chamber through a second exhaust hole provided in the intermediate body (40).

2. The bidirectional oil return structure according to claim 1, characterized in that, The stationary volute (20) has a volute tooth protruding on one side facing the moving volute (30). The volute groove (25) is opened at the tooth tip of the volute tooth and along the axial direction of the stationary volute (20). The end face of the tooth tip of the volute tooth abuts against the end face of the moving volute (30).

3. The bidirectional oil return structure according to claim 1, characterized in that, The second drainage channel forms a second drainage hole (281) on the inner peripheral sidewall of the static vortex disk (20).

4. The bidirectional oil return structure according to claim 3, characterized in that, The static vortex disk (20) is provided with a third drainage channel (27) in the exhaust chamber (21). One end of the third drainage channel (27) is closed and the other end is open. The first drainage channel (26) is connected to the exhaust chamber (21) through the third drainage channel (27). The first drainage channel (26) forms a first drainage hole (261) on the axial end face of the exhaust chamber (21). In the vertical direction, the opening is located below the first drainage hole (261).

5. The bidirectional oil return structure according to claim 4, characterized in that, The axial direction of the stationary vortex disk (20) is parallel to the horizontal direction. The first drainage hole (261) and the second drainage hole (281) are arranged radially spaced along the stationary vortex disk (20) and vertically, the second drainage hole (281) is located at the bottom of the exhaust chamber (21).

6. The bidirectional oil return structure according to claim 3, characterized in that, The second drainage channel includes a first flow channel (42) opened in the intermediate body (40) and a second flow channel (28) opened in the stationary vortex disk (20). The first flow channel (42) is connected to the second flow channel (28), the first flow channel (42) is connected to the back pressure cavity (41), and the second flow channel (28) is connected to the second drainage hole (281).

7. The bidirectional oil return structure according to claim 4, characterized in that, The third drainage channel (27) includes a U-shaped groove, which is opened on the axial end face of the stationary vortex disk (20). The end cover (10) is provided with a cover plate (11), which is engaged with the opening end face of the U-shaped groove in the groove depth direction.

8. The bidirectional oil return structure according to claim 7, characterized in that, Inside the exhaust chamber (21), a boss is provided on the axial end face of the stationary vortex disk (20). Along the axial direction of the stationary vortex disk (20), the end face of the boss is flush with the end face of the peripheral side wall of the stationary vortex disk (20), and the boss is provided with the U-shaped groove.

9. The bidirectional oil return structure according to claim 1, characterized in that, A thrust plate (70) is sandwiched between the intermediate body (40) and the moving scroll (30), and the thrust plate (70) causes the moving scroll (30) to have a tendency to move toward the side where the stationary scroll (20) is located.

10. A scroll compressor, characterized in that, Includes a rotating shaft (50) and a bidirectional oil return structure as described in any one of claims 1-9, wherein one end of the rotating shaft (50) passes through the intermediate body (40) and is connected to the moving scroll (30), and the rotating shaft (50) is rotatably connected to the intermediate body (40) through a bearing (60).

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