Oil supply device for scroll compressor

Abstract

The application discloses a kind of oil supply device for scroll compressor, comprising: main shaft, oil passage is equipped on main shaft, the oil passage is through the both ends of main shaft;Dynamic scroll, dynamic scroll is rotatably arranged on the upper end of main shaft by driving bearing;Upper bearing seat, upper bearing seat is set on the upper portion of main shaft by main bearing sleeve, the dynamic scroll is located above upper bearing seat, the cavity is equipped in the upper bearing seat, the upper end of the upper bearing seat is equipped with oil passing hole;Oil cup, oil cup is set on main shaft, the oil cup is located in cavity, the opening of the oil cup is upward, the oil passing hole is located above the oil cup, oil passing hole is connected with the inner side wall of oil cup and the thrust surface of upper bearing seat, the lower end of the driving bearing is inserted into the oil cup.This scheme better lubricates the back of dynamic scroll, reduces the wear of the back of dynamic scroll and the thrust surface of upper bearing seat, improves the reliability of scroll compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an oil supply device for a scroll compressor. Background Technology

[0002] Scroll compressors are one of the mainstream compressor types in the current refrigeration and air conditioning field. Compared with traditional piston compressors, scroll compressors have very high refrigeration efficiency and low noise and vibration levels. Coupled with their excellent reliability, they are widely welcomed by customers in applications.

[0003] To ensure the stable operation of a scroll compressor, all friction surfaces must be adequately lubricated. However, since the oil supply channels of a scroll compressor are usually located inside the drive shaft, the oil is supplied to the bottom bearing, main bearing, and drive bearing by the centrifugal force of the eccentric hole. It is difficult to supply oil between the back of the moving scroll and the thrust surface, especially for large-displacement scroll compressors, where the axial force of the scroll exceeds tens of thousands of Newtons or even higher. This can easily cause wear on the back of the moving scroll and the thrust surface, thus affecting the reliability of the compressor.

[0004] For example, Chinese Patent Publication No. CN107559203A, published on January 9, 2018, entitled "Oil Supply Device and Scroll Compressor," includes: an oil reservoir with an oil storage chamber, and an oil outlet channel, an oil return channel, and an oil inlet channel all connected to the oil storage chamber; a valve that opens or closes the oil inlet channel; and an oil pump connected to the oil outlet channel. Through the oil supply device of this invention, a stable oil supply to the scroll compressor can be achieved under various conditions, preventing oil shortage in the compressor, effectively lubricating various friction points of the compressor, and improving the reliability of the scroll compressor and the performance of the air conditioner.

[0005] The drawback of existing patents is that it is difficult to supply oil between the back of the moving scroll and the thrust surface of existing scroll compressors. For large-displacement scroll compressors, this can easily cause wear between the back of the moving scroll and the thrust surface, thus affecting the reliability of the scroll compressor. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that it is difficult to supply oil between the back side of the moving scroll and the thrust surface of existing scroll compressors. For large-displacement scroll compressors, this can easily cause wear between the back side of the moving scroll and the thrust surface, thus affecting the reliability of the scroll compressor. The invention provides an oil supply device for scroll compressors that can supply sufficient lubricating oil to the thrust surface during the operation of the scroll compressor, thereby ensuring good lubrication of the back side of the moving scroll and reducing wear between the back side of the moving scroll and the thrust surface.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An oil supply device for a scroll compressor includes: a main shaft with an oil passage extending through both ends of the main shaft; a moving scroll rotatably mounted on the upper end of the main shaft via a drive bearing; an upper bearing housing fitted onto the upper part of the main shaft via a main bearing, the moving scroll positioned above the upper bearing housing, the upper bearing housing having a cavity and an oil passage hole at its upper end; and an oil cup fitted onto the main shaft, the oil cup located within the cavity, the oil cup opening facing upwards, the oil passage hole positioned above the oil cup, the oil passage hole connecting the inner wall of the oil cup and the thrust surface of the upper bearing housing, the lower end of the drive bearing extending into the oil cup. This solution describes an oil supply device for a scroll compressor. An oil cup collects lubricating oil flowing from the drive bearing. The main shaft rotates the oil cup, and the lubricating oil, driven by centrifugal force, is thrown through an oil passage hole to the back of the moving scroll. The lubricating oil flows between the back of the moving scroll and the thrust surface of the upper bearing housing, allowing for better lubrication of the back of the moving scroll, reducing wear between the back of the moving scroll and the thrust surface of the upper bearing housing, and improving the reliability of the scroll compressor. Compared to currently used methods such as top counterweight oiling and gas-carried oil supply, the oil supply is easier to guarantee.

[0009] Preferably, the opening radius at the upper end of the oil cup is smaller than the radius of the oil passage hole. This ensures that the lubricating oil passes through the oil passage hole along the side wall of the oil cup and is thrown to the back of the moving vortex.

[0010] Preferably, the inner wall of the oil cup is a conical surface with a smaller bottom and a larger top, and the upper radius of the conical surface is smaller than the radius of the oil passage hole. The conical surface causes the lubricating oil to be thrown obliquely onto the back of the moving vortex, and the lubricating oil thrown onto the back of the moving vortex is diffused outward by inertia, thus more fully lubricating the back of the moving vortex and the thrust surface of the upper bearing seat.

[0011] Preferably, the bottom of the inner wall of the oil cup is provided with a raised rib extending along the radial direction of the oil cup, and the raised rib is distributed circumferentially along the central axis of the oil cup. The raised rib serves to organize the lubricating oil, so that the lubricating oil in the oil cup flows outward along the radial direction of the oil cup and is thrown onto the back of the moving vortex along the inner side wall of the oil cup.

[0012] Preferably, the upper edge of the oil cup is bent inward to form a bend, and a through hole is provided on the bend, located below the oil passage. The lubricating oil inside the oil cup, under the influence of centrifugal force, gathers towards the inner wall of the oil cup and passes through the through hole, splashing onto the back of the moving vortex. The through hole serves two purposes: firstly, it acts as a guide; secondly, by changing the flow rate of the lubricating oil through its cross-sectional area, it reduces the influence of gravity on the lubricating oil, ensuring that the lubricating oil is fully splashed onto the back of the moving vortex. The angle between the central axis of the through hole and the central axis of the main shaft gradually increases from bottom to top, causing the lubricating oil splashed onto the back of the moving vortex to diffuse outward due to inertia.

[0013] Preferably, the through holes are circumferentially distributed along the central axis of the oil cup. This ensures that the lubricating oil fully lubricates the back of the rotating vortex and the thrust surface of the upper bearing housing.

[0014] Preferably, the oil cup is fixed to the side wall of the spindle by bolts. The oil cup is fixedly mounted on the spindle and rotates with the spindle.

[0015] Preferably, the upper bearing housing includes an upper bearing housing body and a cover plate. The upper bearing housing body has an upward opening, and the cover plate is located at the opening of the upper bearing housing body. The oil passage hole is located on the cover plate, and an oil overflow hole is provided on the lower side wall of the upper bearing housing body. The drive bearing extends into the oil cup through the oil passage hole. A cavity is formed between the upper bearing housing body and the cover plate.

[0016] Preferably, the moving scroll includes a moving scroll base plate and a drive bearing housing disposed below the moving scroll base plate. The upper end of the main shaft is rotatably mounted in the drive bearing housing via the drive bearing. An oil groove extending radially along the drive bearing housing is provided on the lower end surface of the moving scroll base plate, and the oil groove is circumferentially distributed according to the central axis of the drive bearing housing. The oil groove allows the lubricating oil splashed onto the back of the moving scroll to diffuse outwards along the oil groove, fully lubricating the back of the moving scroll and the thrust surface of the upper bearing housing.

[0017] Preferably, the oil passage is eccentrically positioned, with the angle between the central axis of the oil passage and the central axis of the main shaft gradually increasing from bottom to top. This eccentric positioning increases the centrifugal force of the lubricating oil, reduces the influence of gravity on the lubricating oil, and allows more oil to flow from the upper end of the oil passage through the drive bearing into the oil cup, fully lubricating the back of the rotating vortex and the thrust surface of the upper bearing housing.

[0018] Therefore, the present invention has the following beneficial effects: better lubrication of the back side of the moving scroll, reduced wear between the back side of the moving scroll and the thrust surface of the upper bearing housing, and improved reliability of the scroll compressor. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of a scroll compressor as described in Embodiment 1 of the present invention.

[0020] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention.

[0021] Figure 3 This is a schematic diagram of a dynamic vortex structure in Embodiment 1 of the present invention.

[0022] Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of an oil cup in Embodiment 1 of the present invention.

[0024] As shown in the picture:

[0025] Main spindle 1, oil passage 1.1

[0026] 2. Moving scroll vortex, 2.1. Moving scroll base, 2.2. Drive bearing housing, 2.3. Oil groove.

[0027] Drive bearing 3

[0028] 4. Upper bearing housing, 4.1 cavity, 4.2 oil passage hole, 4.3 upper bearing housing body, 4.4 cover plate.

[0029] Oil cup 5, raised rib 5.1, through hole 5.2. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1, as Figure 1 , Figure 2 , Figure 3 , Figure 5 An oil supply device for a scroll compressor is shown, comprising: a main shaft 1, on which an oil passage 1.1 is provided, the oil passage 1.1 passing through both ends of the main shaft 1; a moving scroll 2, which is rotatably mounted on the upper end of the main shaft 1 via a drive bearing 3; an upper bearing seat 4, which is sleeved on the upper part of the main shaft 1 via the main shaft 1, the moving scroll 2 being located above the upper bearing seat 4, the upper bearing seat 4 having a cavity 4.1 inside, and an oil passage hole 4.2 at the upper end of the upper bearing seat 4; and an oil cup 5, which is sleeved on the main shaft 1, located inside the cavity 4.1, with the opening of the oil cup 5 facing upwards, the oil passage hole 4.2 being located above the oil cup 5, the oil passage hole 4.2 connecting the inner wall of the oil cup 5 and the thrust surface of the upper bearing seat 4, the lower end of the drive bearing 3 extending into the oil cup 5.

[0032] In the above embodiment, an oil supply device for a scroll compressor is described. An oil cup 5 collects lubricating oil flowing from the drive bearing 3. The main shaft 1 drives the oil cup 5 to rotate, and the lubricating oil, driven by centrifugal force, is thrown through the oil passage 4.2 onto the back of the moving scroll 2. The lubricating oil flows between the back of the moving scroll 2 and the thrust surface of the upper bearing housing 4, allowing for better lubrication of the back of the moving scroll 2, reducing wear between the back of the moving scroll 2 and the thrust surface of the upper bearing housing 4, and improving the reliability of the scroll compressor. Compared to the currently commonly used top counterweight oil supply and gas-carried oil supply methods, the oil supply volume is easier to guarantee.

[0033] This invention solves the problem of difficulty in supplying oil between the back side of the moving scroll 2 and the thrust surface in existing scroll compressors. For large-displacement scroll compressors, this can easily cause wear between the back side of the moving scroll 2 and the thrust surface, thus affecting the reliability of the scroll compressor.

[0034] The working principle of this invention is as follows: Lubricating oil supplied from bottom to top into oil channel 1.1 flows into oil cup 5 from drive bearing 3. When the main shaft 1 rotates, it drives oil cup 5 to rotate. The lubricating oil in oil cup 5 is affected by centrifugal force and is thrown along the inner wall of oil cup 5 to the back of moving vortex 2 and flows into the space between the back of moving vortex 2 and the thrust surface of upper bearing seat 4. A portion of the lubricating oil falls back into oil cup 5 due to gravity and is repeatedly thrown onto the back of moving vortex 2.

[0035] Specifically, such as Figure 1 , Figure 2 As shown, the opening radius at the upper end of the oil cup 5 is smaller than the radius of the oil passage hole 4.2. This ensures that the lubricating oil passes through the oil passage hole 4.2 along the side wall of the oil cup 5 and is thrown to the back of the moving vortex 2.

[0036] In this embodiment, as Figure 2 As shown, the inner wall of the oil cup 5 is a conical surface with a smaller bottom and a larger top. The upper radius of the conical surface is smaller than the radius of the oil passage 4.2. The conical surface causes the lubricating oil to be thrown obliquely onto the back of the moving vortex 2, and the lubricating oil thrown onto the back of the moving vortex 2 is diffused outward by inertia, thus more fully lubricating the back of the moving vortex 2 and the thrust surface of the upper bearing seat 4.

[0037] Further optimizations to oil cup 5, such as... Figure 5 As shown, the bottom of the inner wall of the oil cup 5 is provided with a raised rib 5.1 extending along the radial direction of the oil cup 5. The raised rib 5.1 is circumferentially distributed according to the central axis of the oil cup 5. The raised rib 5.1 serves to manage the lubricating oil, allowing the lubricating oil in the oil cup 5 to flow outward along the radial direction of the oil cup 5 and be thrown onto the back of the moving vortex 2 along the inner side wall of the oil cup 5. The raised rib 5.1 can be designed into different shapes such as triangular shapes according to actual needs. Furthermore, the raised rib 5.1 is spiral-shaped and circumferentially distributed according to the central axis of the oil cup 5.

[0038] Specifically, the oil cup 5 is fixed to the side wall of the spindle 1 by bolts. The oil cup 5 is fixedly mounted on the spindle 1 and rotates with the spindle 1. Figure 1 , Figure 2As shown, the upper bearing housing 4 includes an upper bearing housing body 4.3 and a cover plate 4.4. The upper bearing housing body 4.3 has an upward opening, and the cover plate 4.4 is located at the opening of the upper bearing housing body 4.3. An oil passage hole 4.2 is located on the cover plate 4.4. An oil overflow hole is provided on the lower side wall of the upper bearing housing body 4.3, and the drive bearing 3 extends into the oil cup 5 through the oil passage hole. A cavity 4.1 is formed between the upper bearing housing body 4.3 and the cover plate 4.4. The moving vortex 2 includes a moving vortex base plate 2.1 and a drive bearing 3 seat 2.2 disposed below the moving vortex base plate 2.1. The upper end of the main shaft 1 is rotatably disposed in the drive bearing 3 seat 2.2 via the drive bearing 3. An oil groove 2.3 is provided on the lower end surface of the moving vortex base plate 2.1, extending along the radial direction of the drive bearing 3 seat 2.2. The oil groove 2.3 is circumferentially distributed according to the central axis of the drive bearing 3 seat 2.2. The oil groove 2.3 allows the lubricating oil splashed on the back of the moving volute 2 to diffuse outward along the oil groove 2.3, fully lubricating the back of the moving volute 2 and the thrust surface of the upper bearing seat 4. A bushing is fitted on the upper end of the main shaft 1, and the drive bearing 3 is fitted on the bushing.

[0039] Further optimization of oil passage 1.1 involves eccentrically positioning oil passage 1.1, with the angle between its central axis and the central axis of the main shaft 1 gradually increasing from bottom to top. This eccentric positioning increases the centrifugal force of the lubricating oil, reduces the influence of gravity on the lubricating oil, and allows more oil to flow from the upper end of oil passage 1.1 through the drive bearing 3 into the oil cup 5, fully lubricating the back of the rotating vortex 2 and the thrust surface of the upper bearing seat 4.

[0040] The present invention has the following beneficial effects: better lubrication of the back side of the moving scroll 2, reduced wear between the back side of the moving scroll 2 and the thrust surface of the upper bearing seat 4, and improved reliability of the scroll compressor.

[0041] Example 2: The basic structure is based on Example 1, but differs in that, for example... Figure 4 As shown, the upper edge of the oil cup 5 is bent inward to form a bend, and a through hole 5.2 is provided on the bend, located below the oil passage hole 4.2. The lubricating oil inside the oil cup 5, under the influence of centrifugal force, gathers towards the inner wall of the oil cup 5 and passes through the through hole 5.2, then is thrown onto the back of the moving vortex 2. The through hole 5.2 serves two purposes: firstly, it acts as a guide; secondly, by changing the flow rate of the lubricating oil through its cross-sectional area, it reduces the influence of gravity on the lubricating oil, allowing it to be fully thrown onto the back of the moving vortex 2. The angle between the central axis of the through hole 5.2 and the central axis of the main shaft 1 gradually increases from bottom to top, causing the lubricating oil thrown onto the back of the moving vortex 2 to diffuse outward due to inertia.

[0042] In this embodiment, the through holes 5.2 are circumferentially distributed along the central axis of the oil cup 5. This ensures that the lubricating oil fully lubricates the back surface of the rotating vortex 2 and the thrust surface of the upper bearing seat 4.

[0043] The specific embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. All equivalent variations made in accordance with the shape and structure of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil supply device for a scroll compressor, characterized in that, include: Main shaft (1), with oil passages (1.1) on the main shaft, the oil passages passing through both ends of the main shaft; The moving vortex (2) is rotated at the upper end of the main shaft via the drive bearing (3); Upper bearing housing (4), the upper bearing housing is sleeved on the upper part of the main shaft through the main bearing, the moving vortex is located above the upper bearing housing, the upper bearing housing is provided with a cavity (4.1), and the upper end of the upper bearing housing is provided with an oil passage hole (4.2). Oil cup (5), the oil cup is sleeved on the main shaft, the oil cup is located in the cavity, the opening of the oil cup faces upward, the oil passage hole is located above the oil cup, the oil passage hole connects the inner wall of the oil cup and the thrust surface of the upper bearing seat, and the lower end of the drive bearing extends into the oil cup; The bottom of the inner wall of the oil cup is provided with a raised rib (5.1) extending in the radial direction of the oil cup. The upper edge of the oil cup is bent inward to form a bent part. A through hole (5.2) is provided on the bent part. The through hole is located below the oil passage hole.

2. The oil supply device for a scroll compressor according to claim 1, characterized in that, The opening radius at the upper end of the oil cup is smaller than the radius of the oil passage hole.

3. The oil supply device for a scroll compressor according to claim 1, characterized in that, The raised ribs are distributed circumferentially along the central axis of the oil cup.

4. The oil supply device for a scroll compressor according to claim 1, characterized in that, The through holes are distributed in a circular pattern along the central axis of the oil cup.

5. An oil supply device for a scroll compressor according to claim 2, 3, or 4, characterized in that, The oil cup is fixed to the side wall of the spindle by bolts.

6. The oil supply device for a scroll compressor according to claim 5, characterized in that, The upper bearing housing includes an upper bearing housing body (4.3) and a cover plate (4.4). The upper bearing housing body has an upward opening, and the cover plate is located at the opening of the upper bearing housing body. The oil passage hole is located on the cover plate. An oil overflow hole is provided on the lower side wall of the upper bearing housing body. The drive bearing extends into the oil cup through the oil passage hole.

7. The oil supply device for a scroll compressor according to claim 6, characterized in that, The moving vortex includes a moving vortex base plate (2.1) and a drive bearing seat (2.2) disposed below the moving vortex base plate. The upper end of the main shaft is rotatably disposed in the drive bearing seat via the drive bearing. An oil groove (2.3) extending along the radial direction of the drive bearing seat is provided on the lower end surface of the moving vortex base plate. The oil groove is circumferentially distributed according to the central axis of the drive bearing seat.

8. An oil supply device for a scroll compressor according to claim 2, 3, or 4, characterized in that, The oil passage is eccentrically positioned, and the angle between the central axis of the oil passage and the central axis of the main shaft gradually increases from bottom to top.

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