Spiral flow channel structure for sliding bearing lubrication of air conditioning scroll compressor

Abstract

This utility model discloses a spiral flow channel structure for lubricating sliding bearings in an air conditioning scroll compressor. It includes a stationary disc, a moving disc, a sliding bearing, a crank, a thrust plate, a middle housing, a shaft seal, and a main shaft connected in series to form a transmission and support assembly. The inner cavity of the middle housing and the moving disc form a lubricating oil pool for storing lubricating oil. The main shaft, the outer cavity of the middle housing, and the inner cavity of the casing form an intake chamber. The crank is a cylindrical structure with a spiral lubricating oil flow channel extending axially on its circumferential surface. The channel is located within the lubrication pair between the sliding bearing and the crank, allowing the lubricating oil in the lubricating oil pool to flow through the crank into the main shaft and into the intake chamber for circulating lubrication. A fan-shaped main balance block is provided on the crank side. When the main shaft rotates, it drives the main balance block to agitate the lubricating oil in the oil pool, enhancing the oil delivery effect, balancing inertia, and reducing vibration. The spiral angle is 15°–60°, which improves lubrication and extends the compressor's lifespan.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning, and in particular to a spiral flow channel structure for lubricating sliding bearings of air conditioning scroll compressors. Background Technology

[0002] As electric vehicles reduce the weight of air conditioning compressors and the demand for heat pumps and their speed range continue to expand, the working environment of air conditioning compressors is becoming increasingly harsh, requiring higher reliability. Therefore, stable and effective lubrication between moving parts is one of the important factors to ensure the reliability of compressor operation.

[0003] With the rapid development of electric vehicles, air conditioning compressors are evolving towards lighter weight, wider speed range, and higher reliability. Meanwhile, the application of heat pump systems places higher demands on the lubrication performance of compressors at extreme temperatures (-30℃ to 120℃). Traditional compressor lubrication systems perform poorly in issues such as insufficient oil supply at low speeds, severe oil sludge at high speeds, and poor adaptability to heat pump conditions, making them unsuitable for the needs of electric vehicle air conditioning compressors.

[0004] Currently, common compressor lubrication methods mainly include:

[0005] 1. Splash lubrication: Relies on rotating parts to agitate lubricating oil to form an oil mist for lubrication. However, it suffers from insufficient oil supply at low speeds, uneven oil mist distribution at high speeds, and cannot guarantee a stable oil film for critical friction pairs such as sliding bearings.

[0006] 2. Straight oil groove lubrication: such as Figure 1 As shown, straight oil grooves are made on the surface of the crankshaft or crank arm to supply oil using centrifugal force. However, at high speeds, the lubricating oil is easily thrown out, and at low speeds, the oil supply pressure is insufficient, resulting in unstable lubrication.

[0007] 3. Forced lubrication (oil pump supply): While forced oil supply via an additional oil pump can improve lubrication, it increases system complexity and energy consumption, which does not meet the requirements of lightweight and high-efficiency electric vehicles.

[0008] Therefore, there is an urgent need for a lubrication solution that is simple in structure, adaptable to a wide speed range, and takes into account both high and low temperature operating conditions, in order to improve the working reliability and service life of the compressor. Utility Model Content

[0009] The purpose of this invention is to provide a spiral flow channel structure for lubricating sliding bearings of air conditioning scroll compressors, which is simple in structure, adaptable to a wide speed range, and suitable for both high and low temperature operating conditions.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A spiral flow channel structure for lubricating sliding bearings in an air conditioning scroll compressor, suitable for compressors, includes a stationary disc, a moving disc, a sliding bearing, a crank, a thrust vane, a middle body, a shaft seal, and a main shaft connected in series.

[0012] The inner cavity of the middle body and the moving plate form a lubricating oil pool for placing lubricating oil, and the outer cavity of the main shaft and the outer cavity of the middle body and the inner cavity of the casing form an air intake chamber;

[0013] The stationary disc is connected to the moving disc, and the moving disc is supported on the crank by a sliding bearing; the crank is fixed on the main shaft and connected to the intermediate machine body through the main bearing; the intermediate machine body is connected to the shaft seal; the main shaft passes through the shaft seal and the intermediate machine body and is inserted into and connected to the crank, driving the crank to rotate through the main shaft;

[0014] The crank has a cylindrical structure, and the circumferential surface of the cylindrical structure is machined with a spiral lubricating oil channel extending along the axial direction. The spiral lubricating oil channel is located in the lubrication pair formed between the sliding bearing and the crank, and is used for continuous lubrication of the lubrication pair. The lubricating oil flows into the main shaft through the crank and enters the intake chamber to form a circulation of lubricating oil.

[0015] Preferably, a fan-shaped main balance block is fixed on one side of the crank. When the main shaft rotates, it drives the fan-shaped main balance block fixed on the crank to rotate accordingly, which is used to stir the lubricating oil in the lubricating oil pool, enhance the delivery of lubricating oil, balance the inertia of the crank rotation, and reduce the vibration when the crank rotates.

[0016] Preferably, the spiral angle of the spiral lubricating oil flow channel is 15°-60°.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) This utility model provides a spiral lubricating oil flow channel extending axially on the surface of the crank, so that the lubricating oil is continuously delivered to the 360° circumferential mating surface between the sliding bearing and the crank when the crank rotates, thereby increasing the contact area between the lubricating oil and the friction pair, thus achieving stable oil film formation and improving the lubrication effect of the sliding bearing.

[0019] 2) This utility model achieves smooth flow of lubricating oil into the sliding bearing area at low speeds through the centrifugal oil guiding effect of the spiral oil channel, and avoids the lubricating oil being thrown out at high speeds, thereby achieving continuous oil supply over a wide speed range and improving the adaptability and reliability of the compressor.

[0020] 3) This utility model achieves a balanced distribution of pressure and flow velocity within the oil passage by setting an oil passage structure with a helix angle of 15°-60°, thereby reducing flow resistance, improving oil supply efficiency, and adapting to the lubrication needs of extreme high and low temperature working conditions.

[0021] 4) This utility model achieves enhanced lubricating oil delivery and circulation by fixing a fan-shaped main balance block on one side of the crank, thereby enabling the main shaft to drive the main balance block to stir the lubricating oil in the lubricating oil pool, while simultaneously balancing the crank rotational inertia and reducing vibration, thus improving the smoothness of operation.

[0022] 5) This utility model uses the insertion channel structure between the crank and the main shaft to enable lubricating oil to flow back from the sliding bearing area into the main shaft and into the intake chamber, thereby forming a closed oil circulation system, reducing lubricating oil consumption and extending the compressor life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the original straight groove oil passage of the crankshaft in the prior art;

[0024] Figure 2 An exploded three-dimensional schematic diagram of a spiral flow channel structure for lubrication of a sliding bearing in an air conditioning scroll compressor, provided as an embodiment of this utility model;

[0025] Figure 3 A side exploded view schematic diagram of a spiral flow channel structure for lubrication of a sliding bearing in an air conditioning scroll compressor, provided as an embodiment of this utility model;

[0026] Figure 4 for Figure 3 AA sectional view;

[0027] Figure 5 This is a side sectional view of a spiral flow channel structure for lubrication of a sliding bearing in an air conditioning scroll compressor, provided as an embodiment of the present invention.

[0028] Figure 6 An exploded three-dimensional schematic diagram of the main balance shaft for a spiral flow channel structure used for lubrication of a sliding bearing in an air conditioning scroll compressor, provided as an embodiment of this utility model.

[0029] Figure 7 A three-dimensional schematic diagram of the crank in a spiral flow channel structure for lubrication of a sliding bearing in an air conditioning scroll compressor, provided as an embodiment of the present invention;

[0030] Figure 8 A top view of the main balance shaft for a spiral flow channel structure used for lubrication of a sliding bearing in an air conditioning scroll compressor, provided as an embodiment of this utility model;

[0031] Figure 9 for Figure 8 A schematic diagram of a BB (Baby Window) diagram;

[0032] Figure 10 This is a cross-sectional structural diagram of the present invention applied to a compressor.

[0033] The serial numbers in the diagram are as follows:

[0034] 1. Moving disc; 2. Sliding bearing; 3. Crank; 4. Main balance block; 5. Thrust plate; 6. Middle body; 7. Shaft seal; 8. Main shaft; 9. Stationary disc; 10. Suction chamber; 11. Lubricating oil sump; 12. Compressor; 13. Spiral lubricating oil flow channel; 14. Original straight groove oil passage; 15. Main bearing; 16. Housing. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0036] like Figures 2 to 10 As shown in this embodiment, a spiral flow channel structure for lubrication of sliding bearings in an air conditioning scroll compressor is disclosed. It is applicable to compressor 12 and is characterized by including a stationary disc 9, a moving disc 1, a sliding bearing 2, a crank 3, a thrust plate 5, a middle body 6, a shaft seal 7, and a main shaft 8 connected in series. The main bearing 15 forms a transmission and support assembly.

[0037] like Figure 10 As shown, the middle body 6 cavity and the moving plate 1 form a lubricating oil pool 10 for placing lubricating oil, and the main shaft 8, the outer cavity of the middle body 6 and the inner cavity of the housing 16 form an air intake chamber 11.

[0038] like Figures 2 to 6 As shown, stationary disc 9 is connected to moving disc 1, and moving disc 1 is supported on crank 3 via sliding bearing 2; crank 3 is fixed on main shaft 8 and connected to intermediate machine body 6 via main bearing 15; intermediate machine body 6 is connected to shaft seal 7; main shaft 8 passes through main bearing 15, and shaft seal 7 and intermediate machine body 6 are inserted into and connected to crank 3, driving crank 3 to rotate via main shaft 8. Wherein, as Figure 7 As shown, the crank 3 adopts a cylindrical structure, and the circumferential surface of the cylindrical structure is machined with a spiral lubricating oil channel 13 extending axially. The spiral lubricating oil channel 13 is located within the lubrication pair formed between the sliding bearing 2 and the crank 3, and is used for continuous lubrication of the lubrication pair. When the compressor 12 is working, the lubricating oil in the lubricating oil sump 10 is transported through the spiral lubricating oil channel 13 on the crank 3 to the mating surface of the sliding bearing 2 and the crank 3, thereby achieving continuous lubrication of the lubrication pair. Figure 9 As shown, the lubricating oil flows into the main shaft 8 through the connection port where the crank 3 is inserted into the main shaft 8, as indicated by the arrow in direction C, and then into the intake chamber 10, forming a circulation of lubricating oil.

[0039] Furthermore, in this embodiment, as Figure 8As shown, a fan-shaped main balance block 4 is fixed on one side of the crank 3. When the main shaft 8 rotates, it drives the fan-shaped main balance block 4 fixed on the crank 3 to rotate accordingly. This is used to stir the lubricating oil in the lubricating oil pool 11, enhance the delivery of lubricating oil, balance the inertia of the crank 3 rotation, and reduce the vibration of the crank 3 during rotation.

[0040] Furthermore, in this embodiment, the helix angle of the spiral lubricating oil flow channel is 15°-60°, and preferably 30°-45°.

[0041] In this embodiment, its working principle is as follows:

[0042] When the main shaft 8 rotates, it drives the crank 3 to rotate, which in turn causes the fan-shaped main balance block 4 fixed on the crank 3 to rotate. The main balance block 4 stirs the lubricating oil in the lubricating oil pool 11 and enters the closed cavity formed by the main shaft 8, crank 3, sliding bearing 2 and moving disk 1 along the spiral oil passage on the surface of the crank 3. The oil then flows into the suction chamber 10 of the compressor through the channel on the main shaft 8, thus forming an oil circulation.

[0043] During the lubricating oil circulation process, due to the oil passages on the surface of crankshaft 3, as shown in the figure... Figure 1 The original straight groove oil passage 14 shown in the prior art is improved into a spiral lubricating oil flow passage 13 in this embodiment, which increases the contact area between the lubricating oil and the sliding bearing 2, thereby improving the lubrication effect when the sliding bearing is working. The rotating crank 3 drives the lubricating oil to flow on its surface oil passage.

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A spiral flow channel structure for lubricating sliding bearings in an air conditioning scroll compressor, suitable for compressor (12), characterized in that, It includes a stationary disc (9), a moving disc (1), a sliding bearing (2), a crank (3), a thrust plate (5), a middle body (6), a shaft seal (7), and a main shaft (8) connected in series. The inner cavity of the middle body (6) and the moving plate (1) form a lubricating oil pool (10) for placing lubricating oil, and the outer cavity of the main shaft (8) and the middle body (6) and the inner cavity of the casing (16) form an air intake chamber (11). The stationary disc (9) is connected to the moving disc (1), and the moving disc (1) is supported on the crank (3) by a sliding bearing (2); the crank (3) is fixed on the main shaft (8) and connected to the intermediate body (6) through the main bearing (15); the intermediate body (6) is connected to the shaft seal (7); the main shaft (8) passes through the shaft seal (7) and the intermediate body (6) and is inserted into and connected to the crank (3), driving the crank (3) to rotate through the main shaft (8); The crank (3) adopts a cylindrical structure, and the circumferential surface of the cylindrical structure is machined with a spiral lubricating oil flow channel (13) extending along the axial direction. The spiral lubricating oil flow channel (13) is located in the lubrication pair formed between the sliding bearing (2) and the crank (3), and is used for the continuous lubrication of the lubrication pair. It flows into the main shaft (8) through the crank (3) and enters the intake chamber (11) to form a circulation of lubricating oil.

2. The spiral flow channel structure for lubrication of sliding bearings in an air conditioning scroll compressor according to claim 1, characterized in that, A fan-shaped main balance block (4) is fixed on one side of the crank (3). When the main shaft (8) rotates, it drives the fan-shaped main balance block (4) fixed on the crank (3) to rotate accordingly. This is used to stir the lubricating oil in the lubricating oil pool (10), enhance the delivery of lubricating oil, balance the inertia of the crank (3) rotation, and reduce the vibration of the crank (3) rotation.

3. The spiral flow channel structure for lubrication of sliding bearings in an air conditioning scroll compressor according to claim 1, characterized in that, The spiral angle of the spiral lubricating oil flow channel (13) is 15°-60°.

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