Scroll plate lubricating device for electric vortex compressor of automobile air conditioner
By designing the oil-collection ring cavity on the back of the movable scroll, the problem of wear of the movable scroll is solved, and the continuous lubrication effect and friction loss are achieved, which improves the reliability of the compressor and reduces energy consumption.
Patent Information
- Application Number
- CN202422752869.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-12
AI Technical Summary
The moving scrolls of existing electric scroll compressors are prone to wear during operation, resulting in increased friction and gas leakage, affecting the efficiency and reliability of the compressor. The existing backpressure structure is designed in complex and cannot effectively balance the axial force when operating conditions change.
The oil collecting ring cavity is designed on the back of the movable scroll, including the inlet, throat and inner cavity, forming a horizontal and vertical oil collecting ring cavity. The lubricating oil film is continuously supplied using the Venturi principle to reduce friction loss.
Effectively reduce wear on the back of the moving scroll disc and the scroll support seat, improve the reliability of the compressor and reduce power consumption, while saving parts and processing costs.
Smart Images
Figure CN223257072U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of automobile air conditioners, in particular to a scroll plate lubricating device for an electric scroll compressor of an automobile air conditioner. Background Art
[0002] The orbiting scroll of an electric scroll compressor is driven by an eccentric shaft, causing it to rotate and translate around the fixed scroll. The scroll teeth of the orbiting and fixed scrolls mesh with each other, forming multiple pairs of crescent-shaped volume chambers. As the orbiting scroll rotates, the volume of the crescent-shaped volume chambers gradually decreases toward the center of the scroll. The low-pressure refrigerant drawn in is continuously compressed within the crescent-shaped volume chambers. Finally, the compressed high-temperature, high-pressure refrigerant is discharged through the exhaust hole in the center of the fixed scroll into the high-pressure chamber in the rear cover.
[0003] As the orbiting scroll moves, the volume of each crescent gradually decreases from suction to discharge, and the pressure within the volume chamber increases accordingly. This pressure forces the orbiting scroll against the scroll support, creating significant friction between the back of the orbiting scroll and the scroll support. If lubrication is poor, the back of the orbiting scroll will quickly wear. Once wear occurs, the gap between the scroll tooth tip and the tooth bottom increases, allowing compressed gas to leak through this gap, causing blowby between the compression crescents and ultimately compressor refrigeration failure. This requires considering solutions to address wear on the back of the orbiting scroll.
[0004] Previous electric scroll compressor designs typically incorporated a backpressure structure to offset the axial force acting on the orbiting scroll. However, the design of this structure is relatively complex, and backpressure control is designed to achieve optimal performance under the designed operating conditions. However, actual compressor operating conditions are not stable. Under certain operating conditions, the backpressure may not balance the axial gas force acting on the orbiting scroll, which can lead to wear in extreme cases. Furthermore, the orbiting scroll also needs to be used in conjunction with other friction-reducing features, such as wear strips installed on the back of the orbiting scroll. Utility Model Content
[0005] The purpose of the utility model is to provide a scroll plate lubricating device for an electric scroll compressor of an automobile air conditioner, so as to solve the deficiencies in the prior art.
[0006] The utility model provides a scroll lubricating device for an electric scroll compressor of an automobile air conditioner, characterized in that it comprises a movable scroll and a gasket; the movable scroll is backed against the gasket; the back surface of the movable scroll is raised to form a continuous sealing belt; the sealing belts are connected to each other to form a plurality of oil collecting ring cavities; the oil collecting ring cavities are located between the movable scroll and the gasket.
[0007] Furthermore, the oil collecting ring cavity includes an inlet, a throat and an inner cavity; the inner cavity is arranged along the circumferential direction of the movable scroll; the inlet points to the center direction of the movable scroll; and the inlet is connected to the inner cavity through the throat.
[0008] Furthermore, the oil collecting ring cavity is arranged between the special-shaped weight-reducing hole and the anti-rotation ring circular hole on the back side of the orbiting scroll, and includes a horizontal oil collecting ring cavity and a vertical oil collecting ring cavity.
[0009] Furthermore, the horizontal oil collecting ring cavity includes two inner cavities, which are located on both sides of the inlet respectively; the number of the throats corresponds to the number of the inner cavities, which open from both sides of the root of the inlet and are respectively connected to the corresponding inner cavities.
[0010] Furthermore, in the longitudinal oil collecting ring cavity, the inlet, the throat and the inner cavity are located in a row; the inlet is located at the front; the throat opens at the tail end of the inlet and is connected to the inner cavity located at the rear.
[0011] Furthermore, the inlet is a bell-shaped mouth that is wide outside and narrow inside.
[0012] Furthermore, the width of the throat is 1 / 4 to 1 / 3 of the width of the inner cavity; and the length of the throat is equal to the width of the throat.
[0013] Furthermore, it is characterized in that the inner cavity has a depth of 0.2 to 0.3 mm.
[0014] Furthermore, the sealing belts corresponding to the plurality of oil collecting ring cavities are connected to each other to form a ring shape centered on the center of the orbiting scroll.
[0015] Furthermore, the height of the sealing tape is not less than 1 mm.
[0016] This utility model is used for the scroll lubrication device of an electric scroll compressor in an automotive air conditioner. By designing an oil collecting ring cavity on the back of the orbiting scroll, it replaces the structure of adding wear-resistant strips on the back of the orbiting scroll. The oil collecting ring cavity can continuously accumulate refrigeration oil during compressor operation, continuously providing a lubricating oil film for the contact surface between the back of the orbiting scroll and the scroll support seat. Compared with the existing technology, its significant features are:
[0017] 1. The utility model reduces the wear caused by direct contact between the back of the movable scroll and the scroll support seat, thereby improving the reliability of the compressor.
[0018] 2. The utility model also reduces the power consumption of the compressor by reducing friction loss.
[0019] 3. The utility model eliminates the need for a sealing strip on the back of the movable scroll, thereby saving both component costs and sealing groove processing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the oil collecting ring cavity structure in a preferred embodiment of the scroll lubrication device for an electric scroll compressor of an automobile air conditioner of the present invention;
[0021] Figure 2 This is a structural diagram of an annular sealing belt in a preferred embodiment of the utility model for a scroll disk lubrication device of an electric scroll compressor for an automobile air conditioner;
[0022] Figure 3 This is a structural diagram of a horizontally arranged oil collecting ring cavity in a preferred embodiment of the utility model for a scroll disk lubrication device of an electric scroll compressor for an automobile air conditioner;
[0023] Figure 4 This is a schematic diagram of the medium flow in the horizontal oil collecting ring cavity of a preferred embodiment of the scroll disk lubrication device of the utility model for an electric scroll compressor of an automobile air conditioner;
[0024] Figure 5 This is a structural diagram of a longitudinal oil collecting ring cavity in a preferred embodiment of the utility model for a scroll disk lubrication device of an electric scroll compressor for an automobile air conditioner;
[0025] Figure 6 This is a schematic diagram of the medium flow in the longitudinal oil collecting ring cavity of a preferred embodiment of the utility model for the scroll disk lubrication device of the electric scroll compressor of the automobile air conditioner;
[0026] Figure 7 The utility model is a schematic assembly diagram of an oil collecting ring cavity structure in a preferred embodiment of a scroll lubrication device for an electric scroll compressor of an automobile air conditioner.
[0027] Among them, 1-static scroll, 2-orbiting scroll, 3-main bearing cavity, 4-gasket, 5-sealing belt, 6-oil collecting ring cavity, 7-horizontal oil collecting ring cavity, 8-vertical oil collecting ring cavity;
[0028] 61- inlet, 62- throat, 63- inner cavity. DETAILED DESCRIPTION
[0029] The specific embodiments of the present invention will be described below with reference to the accompanying drawings. Example
[0030] See also Figures 1 to 7 The present invention discloses a scroll lubricating device for an electric scroll compressor of an automobile air conditioner. As shown in the figure, a preferred embodiment thereof is composed of a movable scroll 2 and a backing plate 4.
[0031] The main components of an electric scroll compressor include a fixed scroll 1, an orbiting scroll 2, a rear cover, a cylinder body, and an eccentric drive shaft. The cylinder body is designed with a scroll support, mounted on a steel backing plate 4. The orbiting scroll 2 is mounted on this steel backing plate 4, with its back against the main bearing cavity 3. The fixed scroll 1 is pressed against the rear cover and inserted into the orbiting scroll 2's scroll teeth. Once installed, the fixed scroll 1 and the orbiting scroll 2's scroll teeth mesh with each other. The rear cover and cylinder body are bolted together.
[0032] On the back of the movable scroll 2, a continuous belt-shaped protrusion is formed in one piece to form a sealing belt 5. The sealing belts 5 are annular to each other and are connected to each other to form an enclosed area. The independently connected enclosed areas constitute the oil collecting ring cavity 6. On the back of the movable scroll 2, according to the back characteristics of the movable scroll 2, the sealing belt 5 passes between the special-shaped weight-reducing holes and the circular holes of the anti-rotation ring on the back of the movable scroll, and finally forms a plurality of oil collecting ring cavities 6. When the compressor is running, the oil collecting ring cavity 6 collects the refrigerant oil in the center part of the movable scroll 2, and is applied to the friction contact surface between the back of the movable scroll 2 and the gasket 4, thereby enhancing the lubrication between the movable scroll 2 and the gasket 4.
[0033] The oil collecting ring cavity 6 includes an inlet 61, a throat 62 and an inner cavity 63. The inlet 61 faces the center of the orbiting scroll 2, while the inner cavity 63 is distributed between the special-shaped weight-reducing hole and the circular hole of the anti-rotation ring on the back of the orbiting scroll 2. The inlet 61 and the inner cavity 63 are connected through the throat 62. The inlet 61 is designed as a bell mouth, with the large mouth facing outward and the small mouth connected to the throat 62. The width of the throat 62 is 1 / 4 to 1 / 3 of the width of the inner cavity 63, and its length is equal to the width of the throat 62 itself, forming a square channel. The inner cavity 63 is pocket-shaped and has a depth of 0.2 to 0.3 mm. If the depth is too large, the cross-sectional area at the inlet will be too large, causing the refrigerant oil in the oil collecting ring cavity 6 to flow back from the inlet 61. The bell-mouth design of the inlet 61 has a large and open opening for easy entry of the refrigerant oil. The design of the bell-mouth inlet 61 followed by the throat 62 and connected to the large volume inner cavity 42 at the rear utilizes the Venturi principle to form a pressure difference between the front and rear sections of the throat 62, thereby generating suction and making it easier for the refrigerant oil to enter.
[0034] The oil collecting ring cavity 6 has two configurations: horizontal oil collecting ring cavities 7 and vertical oil collecting ring cavities 8. In this embodiment, there are three horizontal oil collecting ring cavities 7, located on the upper half of the orbiting scroll. Each horizontal oil collecting ring cavity 7 contains two inner chambers 63, arranged side by side on either side of the inlet 61. Furthermore, two throats 62 are provided on either side of the inlet 61, connecting the two inner chambers 63. In the horizontal oil collecting ring cavity 7, refrigerant oil is drawn into the inlet 61 from below and then flows from the throats 62 on either side into different inner chambers 63 in the left-right direction. In this embodiment, there are also three vertical oil collecting ring cavities 8, located on the lower half of the orbiting scroll. The vertical oil collecting ring cavity 5 has only one inner chamber 63, arranged in series with the inlet 61. Specifically, the inlet 61 is located above the throat 62 and connected to its upper portion. The inner chamber 63 is located below the throat 62, connected to its lower portion and extending in both directions. In the longitudinal oil collecting ring cavity 8, refrigerant oil is drawn into the inlet 61 from above, then enters the inner cavity 63 from below the throat 62, and is dispersed to the left and right. In both the transverse and longitudinal oil collecting ring cavities 7 and 8, during operation, the orbiting scroll 2, under the action of axial force, presses against the backing plate 4. This squeezes out the refrigerant oil from the contact surface, thinning the oil film. Frictional heat also reduces the refrigerant oil viscosity. The refrigerant oil collected in the oil collecting ring cavity 6 can be continuously supplied to ensure a good oil film is formed on the contact surface.
[0035] The oil collecting ring cavity 6 is formed by surrounding a sealing band 5. The sealing band 5 can be designed in the mold or finished later, but to save processing costs, it is generally implemented on the blank. To ensure the effective capacity of the oil collecting cavity, the height of the sealing band 5 is no less than 1 mm. After assembly, the sealing band 5 fits against the backing plate 4, restricting the cooling oil entering the oil collecting ring cavity 6 to the friction contact surface between the orbiting scroll 2 and the backing plate 4 and preventing it from leaving the oil collecting ring cavity 6 from the sides, thus forming a complete annular oil film. In this embodiment, the sealing band 5 forms an annular entity centered on the center of the orbiting scroll 2, dividing the back of the orbiting scroll 2 into six oil collecting ring cavities 6 (three horizontally arranged oil collecting ring cavities 7 and three vertically arranged oil collecting ring cavities 8).
[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. In other words, any equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the technical scope of the present invention.
Claims
1. A scroll lubricating device for an electric scroll compressor of an automobile air conditioner, characterized in that: It comprises a movable scroll and a gasket; the movable scroll is backed against the gasket; the back of the movable scroll is raised to form a continuous sealing belt; the sealing belts are connected to each other to form a plurality of oil collecting ring cavities; the oil collecting ring cavities are located between the movable scroll and the gasket.
2. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to claim 1, characterized in that: The oil collecting ring cavity comprises an inlet, a throat and an inner cavity; the inner cavity is arranged along the circumferential direction of the movable scroll; the inlet points to the center direction of the movable scroll; the inlet is connected to the inner cavity through the throat.
3. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to claim 2, characterized in that: The oil collecting ring cavity is arranged between the special-shaped weight-reducing hole and the anti-rotation ring circular hole on the back of the movable scroll, and includes a horizontal oil collecting ring cavity and a vertical oil collecting ring cavity.
4. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to claim 3, characterized in that: The horizontal oil collecting ring cavity includes two inner cavities, which are located on both sides of the inlet respectively; the number of the throats corresponds to the number of the inner cavities, which open from both sides of the root of the inlet and are respectively connected to the corresponding inner cavities.
5. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to claim 3, characterized in that: In the longitudinal oil collecting ring cavity, the inlet, the throat and the inner cavity are located in a row; the inlet is located at the front; the throat opens at the tail end of the inlet and is connected to the inner cavity located at the rear.
6. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to any one of claims 2, 3, 4 or 5, characterized in that: The inlet is a trumpet mouth that is wide outside and narrow inside.
7. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to any one of claims 2, 3, 4 or 5, characterized in that: The width of the throat is 1 / 4 to 1 / 3 of the width of the inner cavity; the length of the throat is equal to the width of the throat.
8. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to any one of claims 2, 3, 4 or 5, characterized in that: The inner cavity has a depth of 0.2 to 0.3 mm.
9. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to claim 2, wherein: The sealing belts corresponding to the plurality of oil collecting ring cavities are connected to each other to form a ring shape with the center of the orbiting scroll disk as the center.
10. The scroll lubricating device for an electric scroll compressor of an automobile air conditioner according to any one of claims 1 or 9, characterized in that: The height of the sealing tape is not less than 1 mm.