Oil return structure and compressor
By designing lubrication channels and back pressure chamber structures for components such as the moving scroll, stationary scroll, eccentric wheel, and sliding bearing in the compressor, a lubrication circuit is formed, solving the problem of poor lubrication effect, improving the lubrication effect of the sliding bearing, eccentric wheel, and main shaft, and enhancing the reliability of the compressor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SANDEN HUAYU AUTOMOTIVE AIR CONDITIONING CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-23
AI Technical Summary
In the existing technology, the lubricating oil inside the compressor has a poor lubrication effect on the sliding bearings, eccentric wheel and main shaft mating positions, resulting in large friction loss and affecting the reliability of the compressor.
An oil return structure was designed, including a moving scroll, a stationary scroll, an eccentric wheel, a main shaft, and a sliding bearing. By setting up lubrication oil channels and a back pressure chamber, a lubrication circuit is formed to ensure that the refrigeration oil can effectively lubricate the mating positions of the sliding bearing, the eccentric wheel, and the main shaft.
It improves the lubrication of sliding bearings, eccentric wheels and main shaft, reduces friction loss and enhances the overall reliability of the compressor.
Smart Images
Figure CN224396698U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compressor technology, and in particular to an oil return structure and a compressor. Background Technology
[0002] The vehicle-mounted compressor contains refrigerant oil to lubricate the multiple friction pairs within it. The compressor draws in low-temperature refrigerant, which is then compressed by the compression assembly into high-temperature, high-pressure refrigerant before being discharged. During this discharge process, the high-speed flowing refrigerant carries the refrigerant oil from the compressor's oil sump out with it. Over time, this reduces the amount of oil inside the compressor, affecting its reliability.
[0003] In related technologies, an oil separator is typically installed in the discharge chamber inside the compressor to separate the refrigerant oil about to be discharged from the compressor from the refrigerant, allowing it to fall back into the oil sump at the bottom of the discharge chamber and then return to the back pressure chamber between the moving scroll and the intermediate body to lubricate one end of the main bearing and one end of the sliding bearing on the back of the moving scroll. However, the sliding bearing is in close contact with components such as the moving scroll and eccentric wheel, resulting in poor lubrication by the lubricating oil. This leads to significant frictional losses in the sliding bearing, eccentric wheel, and main shaft, posing a potential reliability risk. Utility Model Content
[0004] The purpose of this invention is to provide an oil return structure and a compressor to solve the problem in related technologies where the lubricating oil has a poor lubrication effect on the sliding bearing, eccentric wheel and main shaft mating position, which easily leads to large frictional losses.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] In a first aspect, this utility model provides an oil return structure, the oil return structure comprising:
[0007] A moving scroll plate and a stationary scroll plate, wherein the moving scroll plate has a mounting groove at one axial end opposite to the stationary scroll plate.
[0008] An eccentric wheel and a main shaft, wherein the eccentric wheel is sleeved on the main shaft;
[0009] An intermediate body is located at one axial end of the moving scroll disk opposite to the stationary scroll disk. A back pressure cavity is formed between the intermediate body and the moving scroll disk, and the back pressure cavity is used to communicate with the exhaust cavity.
[0010] A sliding bearing is fixedly installed in the mounting groove. An eccentric wheel is installed in the mounting groove through the sliding bearing. There is a gap between the end face of the sliding bearing and the eccentric wheel at one axial end and the bottom of the mounting groove to form a lubricating oil cavity. A first lubricating oil passage is provided on the sliding bearing, and a second lubricating oil passage is provided on the moving scroll. The lubricating oil cavity is connected to the back pressure cavity through the first lubricating oil passage and the second lubricating oil passage, respectively.
[0011] In one embodiment, the first lubricating passage is arranged along the axial direction of the sliding bearing, and the extension direction of the second lubricating passage forms an angle with the extension direction of the first lubricating passage.
[0012] In one embodiment, the sliding bearing is provided with an axial break, and the two axial ends of the axial break are respectively connected to the lubricating oil cavity and the back pressure cavity to form the first lubricating oil passage.
[0013] In one embodiment, the moving scroll has a hub at one axial end opposite to the stationary scroll, the mounting groove is located inside the hub, and the second lubricating oil passage is formed on the hub.
[0014] In one embodiment, the second lubricating passage is a through hole formed on the hub, and when the sliding bearing is connected to the hub, the through hole is aligned with the axial break.
[0015] In one embodiment, the spindle and the eccentric wheel are in clearance fit, and the clearance between the spindle and the eccentric wheel connects the lubricating oil chamber and the back pressure chamber.
[0016] In one embodiment, the spindle includes a shaft body and a crank pin, the axis of the crank pin having a radial distance from the axis of the shaft body, and the eccentric wheel being sleeved on the crank pin.
[0017] In one embodiment, the intermediate body is provided with a first oil return hole, which is connected to the back pressure chamber, and the stationary vortex disk is provided with a second oil return hole, which is used to connect to the exhaust chamber. When the intermediate body and the stationary vortex disk are connected, the first oil return hole and the second oil return hole are connected.
[0018] In one embodiment, the main shaft passes through the intermediate body, and the main shaft is rotatably connected to the intermediate body.
[0019] Secondly, this utility model provides a compressor, including a housing and an oil return structure as described in any of the above embodiments. The stationary scroll and the intermediate body are both fixedly disposed on the housing. The housing has an exhaust chamber at one axial end of the stationary scroll opposite to the stationary scroll, and the exhaust chamber is connected to the back pressure chamber.
[0020] The beneficial effects of this utility model are as follows:
[0021] This utility model provides an oil return structure and compressor. The oil return structure includes a moving scroll, a stationary scroll, an eccentric wheel, a main shaft, an intermediate body, and a sliding bearing. The sliding bearing has a first lubricating oil passage, and the moving scroll has a second lubricating oil passage. The lubricating oil chamber is connected to the back pressure chamber through the first and second lubricating oil passages, respectively. The refrigerant oil entering the back pressure chamber from the exhaust chamber not only lubricates the sliding bearing, eccentric wheel, and the exposed portion of the main shaft within the back pressure chamber, but also flows back into the lubricating oil chamber through the second lubricating oil passage. The refrigerant oil in the lubricating oil chamber can then flow back to the back pressure chamber from the first lubricating oil passage and other mating clearances, lubricating both ends of the sliding bearing and eccentric wheel. Furthermore, the second lubricating oil passage, the lubricating oil chamber, the first lubricating oil chamber, and the back pressure chamber form a lubrication circuit, facilitating smooth flow and lubrication of the refrigerant oil, thus improving the lubrication effect of the refrigerant oil in the back pressure chamber on the mating positions of the sliding bearing, eccentric wheel, and main shaft. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall structure of the oil return structure in an embodiment of this utility model;
[0023] Figure 2 for Figure 1 Enlarged view of view A in the middle;
[0024] Figure 3 This is a schematic diagram showing the location of the second lubricating oil passage in an embodiment of this utility model;
[0025] Figure 4 This is a schematic diagram of the position and structure of the first lubricating oil passage in an embodiment of this utility model.
[0026] In the picture:
[0027] 1. Moving scroll; 11. Mounting groove; 12. Second lubrication oil passage; 13. Hub;
[0028] 2. Static scroll plate; 21. Second oil return hole;
[0029] 3. Eccentric wheel;
[0030] 4. Main shaft; 41. Shaft body; 42. Crank pin;
[0031] 5. Intermediate body; 51. First oil return hole; 52. Rotary bearing;
[0032] 6. Sliding bearing; 61. First lubrication oil passage;
[0033] 71. Lubricating oil chamber; 72. Back pressure chamber; 73. Exhaust chamber;
[0034] 8. Shell; 81. First shell; 82. Second shell;
[0035] 91. Rotor; 92. Stator. Detailed Implementation
[0036] 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 present 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, not the entire structure.
[0037] In the description of this utility model, 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 utility model based on the specific circumstances.
[0038] 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.
[0039] In the description of this embodiment, the terms "upper," "lower," "left," and "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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0040] like Figures 1 to 4As shown, an embodiment of the first aspect of this utility model provides an oil return structure, which includes a moving scroll 1, a stationary scroll 2, an eccentric wheel 3, a main shaft 4, an intermediate body 5, and a sliding bearing 6. The moving scroll 1 has a mounting groove 11 at the end opposite to the stationary scroll 2. The eccentric wheel 3 is sleeved on the main shaft 4. The intermediate body 5 is located at the end of the moving scroll 1 opposite to the stationary scroll 2. A back pressure cavity 72 is formed between the intermediate body 5 and the moving scroll 1, which is used to communicate with the exhaust cavity 73. The sliding bearing 6 is fixedly installed in the mounting groove 11. The eccentric wheel 3 is installed in the mounting groove 11 through the sliding bearing 6. There is a gap between the end faces of the sliding bearing 6 and the eccentric wheel 3 at their axial ends and the bottom of the mounting groove 11 to form a lubricating oil cavity 71. A first lubricating oil passage 61 is provided on the sliding bearing 6, and a second lubricating oil passage 12 is provided on the moving scroll 1. The lubricating oil cavity 71 is connected to the back pressure cavity 72 through the first lubricating oil passage 61 and the second lubricating oil passage 12, respectively.
[0041] In this embodiment, the refrigerant oil entering the back pressure chamber 72 from the exhaust chamber 73 can not only lubricate the exposed parts of the sliding bearing 6, eccentric wheel 3, and main shaft 4 at one end of the back pressure chamber 72, but also enter the lubrication chamber 71 through the second lubrication channel 12. The refrigerant oil in the lubrication chamber 71 can flow back to the back pressure chamber 72 from the first lubrication channel 61 and other mating gaps, thus lubricating both ends of the sliding bearing 6 and eccentric wheel 3. Furthermore, the second lubrication channel 12, the lubrication chamber 71, the first lubrication chamber 71, and the back pressure chamber 72 can form a lubrication circuit, facilitating smooth flow and lubrication of the refrigerant oil. This improves the lubrication effect of the refrigerant oil in the back pressure chamber 72 on the mating parts of the sliding bearing 6, eccentric wheel 3, and main shaft 4, enhances the overall reliability of the compressor, and solves the problem in related technologies where the lubrication effect of the lubricant at the mating parts of the sliding bearing 6, eccentric wheel 3, and main shaft 4 is poor, leading to significant frictional losses.
[0042] In some embodiments, the first lubricating oil passage 61 is arranged along the axial direction of the sliding bearing 6, allowing the refrigeration oil to flow along the axial direction of the sliding bearing 6, facilitating the formation of a lubrication channel inside the sliding bearing 6 and increasing the lubrication area of the refrigeration oil on the sliding bearing 6. The extension direction of the second lubricating oil passage 12 is at an angle to the extension direction of the first lubricating oil passage 61. Optionally, the extension direction of the second lubricating oil passage 12 can be perpendicular to the extension direction of the first lubricating oil passage 61, so that the refrigeration oil can enter the lubricating oil cavity 71 at a preset angle after passing through the second lubricating oil passage 12, increasing the amount of oil entering the lubricating oil cavity 71 and preventing the refrigeration oil in the second lubricating oil passage 12 from flowing directly into the first lubricating oil passage 61 and then flowing out.
[0043] like Figures 1 to 4As shown, in some embodiments, the sliding bearing 6 is provided with an axial break, and the two ends of the axial break are respectively connected to the lubricating oil cavity 71 and the back pressure cavity 72 to form a first lubricating oil passage 61. That is, the sliding bearing 6 is completely broken at the axial break, which can provide a larger flow lubrication area.
[0044] In this embodiment, the sliding bearing 6 may include a support layer and a sliding layer that are slidably connected. The eccentric wheel 3 may be fixedly disposed in the inner hole of the sliding bearing 6. The eccentric wheel 3 may slide only relative to the moving scroll 1 via the sliding bearing 6, or it may both slide and rotate. Both the support layer and the sliding layer may be broken at the axial break to form the first lubricating oil passage 61. Of course, in some other embodiments, the first lubricating oil passage 61 may also be formed only on the support layer.
[0045] In some embodiments, the moving scroll 1 has a hub 13 at one axial end opposite to the stationary scroll 2, the mounting groove 11 is located inside the hub 13, and the second lubricating oil passage 12 is formed on the hub 13. The hub 13 can be a protruding structure that protrudes axially outward from the disk body of the moving scroll 1, which facilitates providing a larger layout space for the mounting groove 11. Moreover, the second lubricating oil passage 12 can be directly connected to the lubricating oil cavity 71 along the radial direction of the sliding bearing 6 of the hub 13. The hub 13 can be provided with a smaller wall thickness, which shortens the layout path of the second lubricating oil passage 12, making it easier for the refrigeration oil of the back pressure cavity 72 to enter the lubricating oil cavity 71 more quickly and smoothly.
[0046] like Figures 1 to 3 As shown, in some embodiments, the second lubricating oil passage 12 is a through hole opened on the hub 13. When the sliding bearing 6 and the hub 13 are connected, the through hole is aligned with the axial break. The through hole can be located at the communication position between the axial break and the lubricating oil cavity 71. Part of the refrigeration oil flowing out of the through hole can enter the lubricating oil cavity 71, and the other part can enter the axial break position, so as to facilitate the smooth flow of the refrigeration oil branch.
[0047] In some embodiments, the spindle 4 and the eccentric wheel 3 are in clearance fit. The clearance between the spindle 4 and the eccentric wheel 3 connects the lubricating oil chamber 71 and the back pressure chamber 72. The refrigerant oil in the lubricating oil chamber 71 can flow out to the back pressure chamber 72 through the clearance between the spindle 4 and the eccentric wheel 3, which facilitates sufficient lubrication between the spindle 4 and the eccentric wheel 3 and improves the lubrication effect.
[0048] Optionally, the sliding bearing 6 can be press-fitted into the mounting groove 11 to reduce the relative displacement between the sliding bearing 6 and the moving scroll 1.
[0049] like Figures 1 to 2As shown, in some embodiments, the main shaft 4 includes a shaft body 41 and a crank pin 42. The axis of the crank pin 42 has a radial distance from the axis of the shaft body 41. An eccentric wheel 3 is sleeved on the crank pin 42, meaning the crank pin 42 can be eccentrically mounted on the shaft body 41. When a motor or other driving component drives the shaft body 41 to rotate, the crank pin 42 can generate eccentric motion during rotation. The inner diameter of the eccentric wheel 3 matches the outer diameter of the crank pin 42, allowing the eccentric wheel 3 to be tightly mounted on the crank pin 42. A compression chamber is formed between the moving scroll 1 and the stationary scroll 2 to compress the refrigerant. When the shaft body 41 rotates, the eccentric wheel 3 rotates along with the crank pin 42 and generates eccentric motion, driving the moving scroll 1 to reciprocate. This causes the compression chamber between the moving scroll 1 and the stationary scroll 2 to periodically shrink, thereby compressing the refrigerant.
[0050] In some embodiments, the intermediate body 5 is provided with a first oil return hole 51, which is connected to the back pressure chamber 72. The stationary vortex plate 2 is provided with a second oil return hole 21, which is used to connect to the exhaust chamber 73. When the intermediate body 5 and the stationary vortex plate 2 are connected, the first oil return hole 51 and the second oil return hole 21 are connected. The refrigerant oil in the exhaust chamber 73 can smoothly enter the back pressure chamber 72 by flowing through the first oil return hole 51 and the second oil return hole 21 in sequence. After the intermediate body 5 is fixedly connected to the stationary vortex plate 2, the first oil return hole 51 and the second oil return hole 21 can form a complete oil delivery channel, which reduces the external layout of the oil delivery pipeline and reduces the space occupation.
[0051] In some embodiments, the main shaft 4 passes through the intermediate body 5, and the main shaft 4 and the intermediate body 5 are rotatably connected so that the main shaft 4 can be stably mounted on the intermediate body 5, and the intermediate body 5 can provide stable support for the main shaft 4. The main shaft 4 and the intermediate body 5 can be rotatably connected by a rotating bearing 52 to reduce friction and wear.
[0052] like Figures 1 to 4As shown, an embodiment of the second aspect of this utility model provides a compressor, including a housing 8 and an oil return structure of any of the above schemes. The stationary scroll 2 and the intermediate body 5 are both fixedly disposed on the housing 8. The housing 8 has an exhaust chamber 73 at one end of the stationary scroll 2 facing away from the stationary scroll 2, and the exhaust chamber 73 is connected to the back pressure chamber 72. After compression, the high-temperature and high-pressure refrigerant carries the refrigeration oil into the exhaust chamber 73. After passing through the oil separator, the high-pressure refrigerant is discharged from the compressor, and the refrigeration oil falls back to the oil sump at the bottom of the exhaust chamber 73. The refrigeration oil in the exhaust chamber 73 can enter the back pressure chamber 72 under a relatively small pressure gradient. The refrigeration oil in the back pressure chamber 72 can not only lubricate the exposed parts of the sliding bearing 6, eccentric wheel 3, and main shaft 4 at one end of the back pressure chamber 72, but also enter the lubrication chamber 71 through the second lubrication oil passage 12. The refrigeration oil in the lubrication chamber 71 can flow back to the back pressure chamber 72 from the first lubrication oil passage 61 and other mating clearances, which can lubricate both ends of the sliding bearing 6 and eccentric wheel 3. The second lubrication oil passage 12, the lubrication chamber 71, the first lubrication chamber 71, and the back pressure chamber 72 can form a lubrication circuit, which facilitates the smooth flow and lubrication of the refrigeration oil. This improves the lubrication effect of the refrigeration oil in the back pressure chamber 72 on the mating parts of the sliding bearing 6, eccentric wheel 3, and main shaft 4, and enhances the overall reliability of the compressor.
[0053] Optionally, the housing 8 may be a single, integrally formed structure. Alternatively, the housing 8 may include a first housing 81 and a second housing 82, with the stationary scroll 2 connected to the first housing 81 to enclose and form an exhaust chamber 73, and the intermediate body 5 connected to the second housing 82 to enclose and form an installation cavity. The compressor may include a stator 92 and a rotor 91 located within the installation cavity. The stator 92 is fixedly mounted on the second housing 82, and the rotor 91 is fixedly mounted on the main shaft 4. One end of the main shaft 4 is clearance-fitted with the eccentric wheel 3, and the other end is rotatably connected to the second housing 82 via a bearing.
[0054] Because it includes the oil return structure described above, the compressor of this utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.
[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. An oil return structure, characterized in that, The oil return structure includes: A moving scroll plate (1) and a stationary scroll plate (2), wherein the moving scroll plate (1) is provided with a mounting groove (11) at one end of the axial direction opposite to the stationary scroll plate (2); An eccentric wheel (3) and a main shaft (4), wherein the eccentric wheel (3) is sleeved on the main shaft (4); Intermediate body (5), the intermediate body (5) is located at one axial end of the moving scroll (1) opposite to the stationary scroll (2), and a back pressure cavity (72) is formed between the intermediate body (5) and the moving scroll (1), the back pressure cavity (72) is used to communicate with the exhaust cavity (73); A sliding bearing (6) is fixedly installed in the mounting groove (11). An eccentric wheel (3) is installed in the mounting groove (11) through the sliding bearing (6). There is a gap between the end face of the sliding bearing (6) and the eccentric wheel (3) and the bottom of the mounting groove (11) to form a lubricating oil cavity (71). A first lubricating oil passage (61) is provided on the sliding bearing (6), and a second lubricating oil passage (12) is provided on the moving scroll (1). The lubricating oil cavity (71) is connected to the back pressure cavity (72) through the first lubricating oil passage (61) and the second lubricating oil passage (12).
2. The oil return structure according to claim 1, characterized in that, The first lubricating oil passage (61) is arranged along the axial direction of the sliding bearing (6), and the extension direction of the second lubricating oil passage (12) is at an angle to the extension direction of the first lubricating oil passage (61).
3. The oil return structure according to claim 2, characterized in that, The sliding bearing (6) is provided with an axial break, and the two ends of the axial break are respectively connected to the lubricating oil cavity (71) and the back pressure cavity (72) to form the first lubricating oil passage (61).
4. The oil return structure according to claim 3, characterized in that, The moving scroll (1) has a hub (13) at one axial end opposite to the stationary scroll (2), the mounting groove (11) is located in the hub (13), and the second lubricating oil passage (12) is formed on the hub (13).
5. The oil return structure according to claim 4, characterized in that, The second lubricating oil passage (12) is a through hole opened on the hub (13). When the sliding bearing (6) and the hub (13) are connected, the through hole is aligned with the axial break.
6. The oil return structure according to any one of claims 1-5, characterized in that, The main shaft (4) and the eccentric wheel (3) are in clearance fit, and the clearance between the main shaft (4) and the eccentric wheel (3) connects the lubricating oil cavity (71) and the back pressure cavity (72).
7. The oil return structure according to any one of claims 1-5, characterized in that, The main shaft (4) includes a shaft body (41) and a crank pin (42). The axis of the crank pin (42) has a radial distance from the axis of the shaft body (41). The eccentric wheel (3) is sleeved on the crank pin (42).
8. The oil return structure according to any one of claims 1-5, characterized in that, The intermediate body (5) is provided with a first oil return hole (51), which is connected to the back pressure chamber (72). The stationary vortex disk (2) is provided with a second oil return hole (21), which is connected to the exhaust chamber (73). When the intermediate body (5) and the stationary vortex disk (2) are connected, the first oil return hole (51) and the second oil return hole (21) are connected.
9. The oil return structure according to any one of claims 1-5, characterized in that, The main shaft (4) passes through the intermediate body (5), and the main shaft (4) and the intermediate body (5) are rotatably connected.
10. A compressor, characterized in that, The device includes a housing (8) and the oil return structure according to any one of claims 1-9. The stationary vortex disk (2) and the intermediate body (5) are both fixedly disposed on the housing (8). The housing (8) has an exhaust chamber (73) at one axial end of the stationary vortex disk (2) facing away from the stationary vortex disk (2). The exhaust chamber (73) is connected to the back pressure chamber (72).