Piston with ball structure
By incorporating a ball bearing structure on the outer periphery of the piston, the contact area between the piston and the cylinder bore of the cylinder seat is reduced and replaced with rolling friction, thus solving the problem of low motor efficiency caused by high frictional resistance and improving the overall performance of the compressor.
Patent Information
- Application Number
- CN202423130513.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-18
AI Technical Summary
The piston of a current refrigerator compressor has a large friction area and high frictional resistance, which reduces the efficiency of the motor and affects the performance of the compressor.
Design a piston with a ball bearing structure. By setting a second circumferential mating surface and rolling components on the outer periphery of the piston, the direct contact area between the piston and the cylinder bore of the cylinder seat is reduced, and the surface contact friction is changed to rolling friction. Lubricating oil holes are added to reduce frictional resistance.
Reducing frictional resistance, decreasing heat generation, increasing piston speed, and improving compressor efficiency are all benefits of motor efficiency, which is primarily used to enhance compressor performance.
Smart Images
Figure CN223511063U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigeration compressor technology, specifically to a piston with a ball bearing structure. Background Technology
[0002] The pistons used in existing refrigerator compressors have a structure with mating surfaces at both ends and an oil groove in the middle. When the compressor is running, the piston reciprocates in the cylinder bore of the cylinder seat to do work.
[0003] The existing piston structure has a large contact area between the piston ends and the cylinder bore of the cylinder seat. During the reciprocating motion of the piston, the friction area is large and the frictional resistance is relatively large. This requires the motor to share some of its efficiency to counteract the frictional resistance, thereby reducing the motor's efficiency and affecting the performance of the compressor. Summary of the Invention
[0004] The purpose of this invention is to address the problems existing in the prior art by providing a piston with a ball bearing structure.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A piston with a ball bearing structure, wherein the piston has a first circumferential mating surface and a second circumferential mating surface on its outer periphery, the outer diameter of the second circumferential mating surface is smaller than the outer diameter of the first circumferential mating surface, and a plurality of rolling components are provided on the second circumferential mating surface; the sum of the radial distance of the rolling components exposed on the second circumferential mating surface and the radius of the second circumferential mating surface is equal to the radius of the first circumferential mating surface.
[0007] This piston with ball bearing structure can reduce the mating surface area between the piston and the cylinder seat bore, reduce frictional resistance, and reduce the heat generated by friction. This facilitates the reciprocating motion of the piston within the cylinder seat bore and improves compressor efficiency.
[0008] This piston can reduce the mating surface area and frictional resistance in two ways: first, the setting of the second circumferential mating surface can significantly reduce the direct contact area between the outer circumference of the piston and the cylinder seat bore; second, the setting of the rolling component can change some of the surface contact friction to rolling friction (point contact) during the movement of the piston and the cylinder seat bore.
[0009] The rolling component, while ensuring the relative positional fit between the piston and the cylinder bore, can reduce frictional resistance and improve the piston's movement speed, accelerating the piston's reciprocating motion. This allows the motor (the motor inside the compressor) to be used more efficiently to improve the compressor's performance.
[0010] Preferably, the rolling component is a ball bearing, which is embedded in the second circumferential mating surface.
[0011] Furthermore, a ball bearing hole is provided on the second circumferential mating surface, and the ball bearing is rotatably installed in the ball bearing hole, with the outer circumferential surface of the ball bearing protruding from the inner circumference of the second circumferential mating surface.
[0012] Furthermore, the radial distance by which the rolling component exposes the second circumferential mating surface does not exceed 0.15 mm, preferably not exceeding 0.1 mm.
[0013] Furthermore, several of the rolling components are circumferentially arranged on the second circumferential mating surface, and the several rolling components are symmetrically arranged on the second circumferential mating surface with the radial pin hole on the piston as the central axis. The symmetrical arrangement is conducive to stable force distribution.
[0014] Furthermore, there are 4 to 16 rolling components, with 2 to 8 on each side, generally an even number.
[0015] Furthermore, a radially penetrating oil hole is provided on the second circumferential mating surface near the first circumferential mating surface to introduce lubricating oil and further reduce friction.
[0016] Furthermore, the piston is assembled inside the cylinder bore of the compressor's cylinder seat. Viewed from the insertion direction, the second circumferential mating surface is located on the inner side of the cylinder bore of the cylinder seat, ensuring a relatively sealed structure on the outer side.
[0017] Furthermore, the piston has a boss structure on its inner circumference and a pin hole that radially penetrates the boss structure, the pin hole passing through the first circumferential mating surface and the second circumferential mating surface.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The piston with ball bearing structure can reduce the mating surface area between the piston and the cylinder seat bore, reduce frictional resistance, and reduce the heat generated by friction, which is conducive to the reciprocating motion of the piston in the cylinder seat bore and improves the compressor efficiency; 2. This piston can reduce the mating surface area and frictional resistance in two aspects: first, the setting of the second circumferential mating surface can significantly reduce the direct contact area between the outer circumference of the piston and the cylinder seat bore; second, the setting of the rolling component can change some of the surface contact friction to rolling point friction during the movement of the piston and the cylinder seat bore; 3. The setting of the rolling component can reduce frictional resistance and improve the piston movement speed, accelerate the piston reciprocating motion, and allow more of the motor efficiency to be used to improve the performance level of the compressor; 4. The setting of the oil hole can lead the lubricating oil out of the mating surface during the piston movement, allowing the lubricating oil to enter not only the first circumferential mating surface, but also the location of the ball bearing to form an oil film, further reducing frictional resistance and facilitating the reciprocating motion of the piston. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of a piston with a ball bearing structure according to the present invention;
[0020] Figure 2 This is a schematic diagram of the axial cross-section of the piston of this utility model installed in the cylinder bore of the cylinder seat;
[0021] Figure 3 This is a schematic diagram of the radial cross-section of the piston of this utility model installed in the cylinder bore of the cylinder seat;
[0022] In the diagram: 1. First circumferential mating surface; 2. Second circumferential mating surface; 3. Ball bearing; 4. Ball bearing hole; 5. Oil hole; 6. Pin hole; 7. Boss structure; 8. Cylinder seat bore. Detailed Implementation
[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0024] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0025] like Figures 1-3 As shown, a piston with a ball bearing structure is provided on the outer periphery of the piston. The outer periphery of the piston is provided with a first circumferential mating surface 1 and a second circumferential mating surface 2. The outer diameter of the second circumferential mating surface 2 is smaller than the outer diameter of the first circumferential mating surface 1. A plurality of rolling components are provided on the second circumferential mating surface 2. The sum of the radial distance of the rolling components exposed on the second circumferential mating surface 2 and the radius of the second circumferential mating surface 2 is equal to the radius of the first circumferential mating surface 1.
[0026] This piston with ball bearing structure can reduce the mating surface area between the piston and the cylinder seat bore, reduce frictional resistance, and reduce the heat generated by friction. This facilitates the reciprocating motion of the piston within the cylinder seat bore and improves compressor efficiency.
[0027] This piston can reduce the mating surface area and frictional resistance in two ways: first, the setting of the second circumferential mating surface 2 can significantly reduce the direct contact area between the outer circumference of the piston and the cylinder bore of the cylinder seat; second, the setting of the rolling component can change some of the surface contact friction to rolling friction (point contact) during the movement of the piston and the cylinder bore of the cylinder seat.
[0028] Since the part of the piston that mates with the cylinder bore 8 of the cylinder seat needs to ensure the function of compressing gas and sealing the volume of the cylinder bore, this part of the structure remains unchanged, which is the first circumferential mating surface 1; the part of the piston that mates with the cylinder bore only needs to ensure its position with the cylinder bore, reducing the contact area of this part, which is the second circumferential mating surface 2, can reduce the frictional resistance in reciprocating motion.
[0029] The rolling component, while ensuring the relative positional fit between the piston and the cylinder bore of the cylinder seat, can reduce frictional resistance and improve the piston's movement speed, accelerating the piston's reciprocating motion. This allows the efficiency of the motor (the motor inside the compressor) to be used more to improve the performance level of the compressor.
[0030] The sum of the radial distance of the rolling component exposed from the second circumferential mating surface and the radius of the second circumferential mating surface is equal to the radius of the first circumferential mating surface. This ensures that after the piston mates with the cylinder bore of the cylinder seat, the first circumferential mating surface and the rolling components can simultaneously mate with the inner circumference of the cylinder bore of the cylinder seat.
[0031] Preferably, the rolling component is a ball bearing 3, which is embedded in the second circumferential mating surface 2.
[0032] Furthermore, the second circumferential mating surface 2 is provided with a ball hole 4, and the ball 3 is rotatably installed in the ball hole 4. The outer circumferential surface of the ball 3 protrudes from the inner circumference of the second circumferential mating surface 2. At this time, the ball hole 4 is a through hole. If the outer circumferential surface of the ball 3 does not protrude from the inner circumference of the second circumferential mating surface 2, then a smaller ball needs to be designed so that it is embedded in the ball hole 4 on the outer circumference of the second circumferential mating surface 2. At this time, the ball hole 4 is a blind hole.
[0033] The ball bearing hole 4 has an arc-shaped cross-section, with a diameter slightly larger than that of the ball bearing 3, allowing it to accommodate the ball bearing 3 and embed its center within it. The ball bearing 3 can rotate without falling out. During assembly, the ball bearing can be pressed in using thermal expansion and contraction.
[0034] In some embodiments, the ball bearing hole 4 has an outwardly rounded corner structure on the outer periphery of the second circumferential mating surface so that the ball bearing 3 can be pressed in. After the piston is assembled into the cylinder bore of the cylinder seat, the ball bearing will be restricted at the mating surface and will not fall off.
[0035] Furthermore, the radial distance by which the rolling component exposes the second circumferential mating surface 2 does not exceed 0.15 mm, so as to avoid excessive mating clearance.
[0036] Preferably, the radial distance by which the rolling component exposes the second circumferential mating surface 2 is 0.1 mm.
[0037] Furthermore, a plurality of the rolling components are circumferentially arranged on the second circumferential mating surface 2, and the plurality of rolling components are symmetrically arranged on the second circumferential mating surface 2 with the radial pin hole 6 on the piston as the central axis. Figure 1 See, the left and right sides are symmetrical, and if there is an even number of balls, the top and bottom are also symmetrical. This symmetrical arrangement can improve the stability of the movement.
[0038] Furthermore, there are 4 to 16 rolling components, with 2 to 8 on each side.
[0039] In this embodiment, four balls 3 are evenly spaced on each side, which avoids the boss structure 7 and pin hole 6 in the middle.
[0040] Furthermore, a radially penetrating oil hole 5 is provided on the second circumferential mating surface 2 near the first circumferential mating surface 1. The oil hole 5 can lead the lubricating oil out of the mating surface during piston movement, allowing the lubricating oil to enter not only the first circumferential mating surface 1, but also the location of the ball bearing 3, forming an oil film, further reducing frictional resistance and facilitating the reciprocating motion of the piston.
[0041] Furthermore, the piston is assembled in the cylinder bore of the compressor cylinder seat. From the installation direction, the second circumferential mating surface 2 is located on the inner side of the cylinder bore 8 of the cylinder seat. This arrangement ensures that the first circumferential mating surface always mates with the cylinder bore of the cylinder seat, thereby forming the necessary seal.
[0042] Furthermore, the piston has a pair of opposing boss structures 7 on its inner circumference, and a pin hole 6 that radially penetrates the boss structure 7. The pin hole 6 is for connecting the pin at the end of the connecting rod, so that the connecting rod can connect to the piston. This arrangement can ensure the strength and stability of the pin connection. The pin hole passes through the first circumferential mating surface and the second circumferential mating surface, that is, the pin hole is set at the intersection of the two, so that the two circumferential mating surfaces can share the force.
[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A piston with a ball bearing structure, characterized in that, The piston has a first circumferential mating surface and a second circumferential mating surface on its outer periphery. The outer diameter of the second circumferential mating surface is smaller than the outer diameter of the first circumferential mating surface. A plurality of rolling components are provided on the second circumferential mating surface. The sum of the radial distance of the rolling components exposed on the second circumferential mating surface and the radius of the second circumferential mating surface is equal to the radius of the first circumferential mating surface.
2. The piston with ball bearing structure according to claim 1, characterized in that, The rolling component is a ball bearing, which is embedded in the second circumferential mating surface.
3. The piston with ball bearing structure according to claim 2, characterized in that, The second circumferential mating surface is provided with a ball bearing hole, and the ball bearing is rotatably installed in the ball bearing hole, with the outer circumferential surface of the ball bearing protruding from the inner circumference of the second circumferential mating surface.
4. The piston with ball bearing structure according to claim 1, characterized in that, The radial distance by which the rolling component exposes the second circumferential mating surface does not exceed 0.15 mm.
5. The piston with ball bearing structure according to claim 1, characterized in that, A plurality of the rolling components are circumferentially arranged on the second circumferential mating surface, and the plurality of the rolling components are symmetrically arranged on the second circumferential mating surface with the radial pin hole on the piston as the central axis.
6. The piston with ball bearing structure according to claim 1, characterized in that, The number of rolling components is 4 to 16, with 2 to 8 components on each side.
7. The piston with ball bearing structure according to claim 1, characterized in that, A radially penetrating oil hole is also provided on the second circumferential mating surface near the first circumferential mating surface.
8. The piston with ball bearing structure according to claim 1, characterized in that, The piston is assembled in the cylinder bore of the compressor cylinder seat, and from the installation direction, the second circumferential mating surface is located on the inner side of the cylinder bore of the cylinder seat.
9. The piston with ball bearing structure according to claim 1, characterized in that, The piston has a boss structure on its inner circumference and a pin hole that radially penetrates the boss structure. The pin hole passes through the first circumferential mating surface and the second circumferential mating surface.