Piston for improving sealing performance of compressor
By designing a piston with annular groove, the outer wall of the groove is deformed outward or inside by the difference in exhaust and suction pressures, and the fitting gap between the piston and the cylinder is adjusted, the sealing problem caused by the decrease in the viscosity of the refrigeration oil is solved, and the sealing problem is improved. The cooling capacity and reliability of the compressor.
Patent Information
- Application Number
- CN202411522347.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-02-18
AI Technical Summary
During long-term operation, the existing compressor pistons have reduced viscosity of the refrigeration oil, resulting in poor sealing between the piston and the cylinder, causing leakage and wear, affecting the cooling capacity and reliability of the compressor.
A piston including a piston body, a piston top wall, a piston side wall and an annular groove is designed. The outer wall of the groove is deformed to the shape under the exhaust pressure, increasing the outer circle of the piston to reduce the fitting gap with the cylinder, and absorbing the When air compresses, the outer end face of the groove is subjected to less pressure, and the outer circle of the piston remains or deforms inward, increasing gaps to reduce contact and wear.
Through the deformation design of the piston, the matching gap between the piston and the cylinder is reduced, leakage and wear are reduced, and the sealing and cooling capacity of the compressor are improved, thereby improving the reliability of the entire machine.
Smart Images
Figure CN119467281A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of auxiliary components for compressors, and in particular to a piston for improving the sealing performance of a compressor. Background Art
[0002] Refrigerator compressors mostly use the clearance between the piston and the cylinder to achieve reciprocating motion. The size of the clearance determines the performance of the compressor: the smaller the clearance, the more contact between the piston and the cylinder, the compressor power will increase, and the COP will decrease. At the same time, the piston surface wear will increase. The larger the clearance, the more leakage will occur between the piston and the cylinder, and the cooling capacity will be low, which will eventually affect the COP. It will also affect a series of problems such as compressor oil discharge. Therefore, the appropriate clearance between the piston and the cylinder is particularly important.
[0003] The piston is often made of powder metallurgy, and the surface phosphating enhances the strength and wear resistance of the piston to prevent the piston from wearing and causing the compressor to jam. The high-speed reciprocating motion of the piston not only bears the deformation caused by the temperature rise, but also bears the deformation caused by the exhaust pressure and the pressure caused by the crankshaft power transmitted to the connecting rod. Therefore, these two situations aggravate the contact between the piston and the cylinder, resulting in wear. In order to prevent piston wear, it is necessary to select the appropriate piston and cylinder to match the reserved gap during the actual assembly and operation process to reduce the contact between the piston and the cylinder. At the same time, it is also necessary to use refrigeration oil to lubricate and seal between the piston and the cylinder. Long-term high-speed motion reduces the viscosity of the refrigeration oil, and the lubrication and sealing of the refrigeration oil decreases. Finally, the piston wears or the seal is not tight, resulting in leakage.
[0004] The technical solution of the present invention aims to improve the piston structure and the loose sealing between the piston and the cylinder caused by the reduction of the viscosity of the refrigeration oil during long-term operation of the piston, thereby increasing the cooling capacity of the compressor and thus improving the reliability of the entire machine. Summary of the invention
[0005] In view of the above technical problems in the related art, the present invention proposes a piston for improving the sealing performance of a compressor, which can overcome the above deficiencies in the prior art.
[0006] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: A piston for improving the sealing performance of a compressor; The piston for improving the sealing performance of the compressor includes a piston body, the top and side of the piston body are respectively a piston top wall and a piston side wall, the edge of the piston top wall is provided with a circle of annular groove, the side of the annular groove facing the cylinder is the groove outer wall, the groove outer wall can be deformed toward the outside under the influence of the compressor exhaust pressure, and can be reset or deformed toward the inside under the influence of suction compression.
[0007] Furthermore, the thickness of the outer wall of the groove is smaller than the width of the annular groove.
[0008] Furthermore, under the influence of exhaust pressure, the outer circumferential dimension of the outer wall of the groove is larger than the outer circumferential dimension of the piston body.
[0009] Furthermore, under the influence of suction compression, the outer circumferential dimension of the outer wall of the groove is smaller than or equal to the outer circumferential dimension of the piston body.
[0010] Furthermore, a wear-resistant coating material is provided on the outer wall of the groove.
[0011] Furthermore, the wear-resistant coating material is molybdenum, nickel or vanadium.
[0012] Furthermore, the annular groove is a U-shaped annular groove, and the bottom of the annular groove is a flat surface or a curved surface.
[0013] Furthermore, the annular groove is aligned with the center position of the piston top wall.
[0014] Furthermore, the minimum distances between the annular groove and the piston side wall are all equal.
[0015] Furthermore, a chamfer is formed between the annular groove and the outer wall of the groove and the top wall of the piston.
[0016] The beneficial effects of the present invention are as follows: through the optimized and improved design of the product of the present invention, the plasticity and ductility of the metal material of the piston are utilized to allow the groove wall on the outer side of the piston to be deformed, so that during the exhaust operation of the compressor, the inside of the annular groove of the piston is affected by the exhaust pressure, causing the outer side of the annular groove to slightly deform outward, thereby increasing the outer circle size of the piston, thereby reducing the fitting clearance between the piston and the cylinder, and reducing leakage caused by the large clearance between the piston and the cylinder; at the same time, during the suction process of the compressor, the piston is affected by the suction compression, and the outer end face of the annular groove is subjected to less pressure, and the outer circle of the piston retains its original size, or is deformed inward, thereby increasing the fitting clearance between the piston and the cylinder, reducing the contact between the piston and the cylinder, reducing the possibility of wear, and improving the reliability of the piston. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 is a three-dimensional diagram of a piston for improving the sealing performance of a compressor according to an embodiment of the present invention; Figure 2 is a top view of a piston for improving the sealing performance of a compressor according to an embodiment of the present invention; Figure 3 A piston for improving the sealing performance of a compressor according to an embodiment of the present invention Figure 2 Cross-sectional view of the middle AA line during inspiration; Figure 4 A piston for improving the sealing performance of a compressor according to an embodiment of the present invention Figure 3 A partial enlarged view of point B in the middle; Figure 5 A piston for improving the sealing performance of a compressor according to an embodiment of the present invention Figure 2 Cross-sectional view of line AA during exhaust process; Figure 6 A piston for improving the sealing performance of a compressor according to an embodiment of the present invention Figure 5 A partial enlarged view of point C in the middle; In the figure: 1. piston body; 2. piston top wall; 3. piston side wall; 4. annular groove; 5. groove outer wall. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.
[0020] It should be understood that, in the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.
[0021] like Figure 1-6 As shown, a piston for improving the sealing performance of a compressor according to an embodiment of the present invention comprises a piston body 1, the top and side of the piston body 1 are respectively a piston top wall 2 and a piston side wall 3, the edge of the piston top wall 2 is provided with a circle of annular groove 4, the side of the annular groove 4 facing the cylinder is a groove outer wall 5, the groove outer wall 5 can be deformed toward the outside under the influence of the exhaust pressure of the compressor, and can be reset or deformed toward the inside under the influence of the suction compression.
[0022] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the thickness dimension of the groove outer wall 5 is smaller than the width dimension of the annular groove 4 .
[0023] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the outer circumferential dimension of the groove outer wall 5 is greater than the outer circumferential dimension of the piston body 1 under the influence of exhaust pressure.
[0024] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the outer circumferential dimension of the groove outer wall 5 is less than or equal to the outer circumferential dimension of the piston body 1 under the influence of suction compression.
[0025] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, a wear-resistant coating material is additionally provided on the outer wall 5 of the groove.
[0026] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the wear-resistant coating material is molybdenum, nickel or vanadium.
[0027] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the annular groove 4 is located at the same center as the center of the piston top wall 2 .
[0028] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the minimum distances between the annular groove 4 and the piston side wall 3 are all equal.
[0029] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, the annular groove 4 is a U-shaped annular groove, and the bottom of the annular groove 4 is a flat surface or a curved surface.
[0030] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, a chamfer is formed between the annular groove 4 and the groove outer wall 5 and the piston top wall 2 .
[0031] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.
[0032] In specific use, a piston for improving the sealing performance of a compressor according to the present invention includes a piston body 1, a piston top wall 2, a piston side wall 3, an annular groove 4, and a groove outer wall 5.
[0033] The top of the piston top wall 2 is provided with a circle of annular groove 4, the outer end surface of the annular groove is relatively thin, and the plasticity and ductility of the piston metal material are utilized to allow the piston groove wall to deform outward when subjected to internal pressure.
[0034] In addition, a molybdenum coating is added to the outer wall 5 of the groove, and other wear-resistant coating materials (nickel / vanadium) can also be used to increase the wear resistance of the piston surface and improve the reliability of the piston.
[0035] It should be noted that the shape of the annular groove 4 is not fixed, and a U-shaped cross-section is one embodiment, but is not limited to the U-shaped shape. Solutions that are conducive to external deformation due to pressure are all alternative solutions of this patent.
[0036] To sum up, with the help of the above technical scheme of the present invention, through the optimization and improvement design of the product of the present invention, the plasticity and ductility of the metal material of the piston are utilized to allow the outer groove wall of the piston to deform, so that during the exhaust operation of the compressor, the inside of the annular groove of the piston is affected by the exhaust pressure, causing the outer side of the annular groove to slightly deform outward, thereby increasing the outer circle size of the piston, thereby reducing the fitting clearance between the piston and the cylinder, and reducing leakage caused by the large clearance between the piston and the cylinder; at the same time, during the suction process of the compressor, the piston is affected by the suction compression, and the outer end face of the annular groove is subjected to less pressure, and the outer circle of the piston retains the original size, or deforms inward, thereby increasing the fitting clearance between the piston and the cylinder, reducing the contact between the piston and the cylinder, reducing the possibility of wear, and improving the reliability of the piston.
[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A piston for improving the sealing performance of a compressor, characterized in that: The invention comprises a piston body (1), wherein the top and the side of the piston body (1) are respectively a piston top wall (2) and a piston side wall (3), the edge of the piston top wall (2) is provided with a circle of annular grooves (4), the side of the annular groove (4) facing the cylinder is a groove outer wall (5), and the groove outer wall (5) can be deformed toward the outside under the influence of the exhaust pressure of the compressor, and can be reset or deformed toward the inside under the influence of the suction compression.
2. A piston for improving the sealing performance of a compressor according to claim 1, characterized in that: The thickness dimension of the groove outer wall (5) is smaller than the width dimension of the annular groove (4).
3. A piston for improving the sealing performance of a compressor according to claim 1, characterized in that: Under the influence of exhaust pressure, the outer circumferential dimension of the outer wall (5) of the groove is larger than the outer circumferential dimension of the piston body (1).
4. A piston for improving the sealing performance of a compressor according to claim 1, characterized in that: Under the influence of suction compression, the outer circumferential dimension of the outer wall (5) of the groove is smaller than or equal to the outer circumferential dimension of the piston body (1).
5. The piston for improving the sealing performance of a compressor according to claim 1, characterized in that: A wear-resistant coating material is additionally provided on the outer wall (5) of the groove.
6. A piston for improving the sealing performance of a compressor according to claim 5, characterized in that: The wear-resistant coating material is molybdenum, nickel or vanadium.
7. The piston for improving the sealing performance of a compressor according to claim 1, characterized in that: The annular groove (4) is a U-shaped annular groove, and the bottom of the annular groove (4) is a flat surface or a curved surface.
8. The piston for improving the sealing performance of a compressor according to claim 1, characterized in that: The annular groove (4) is located at the same center position as the piston top wall (2).
9. The piston for improving the sealing performance of a compressor according to claim 8, characterized in that: The minimum distances between the annular groove (4) and the piston side wall (3) are all equal.
10. A piston for improving the sealing performance of a compressor according to any one of claims 1 to 9, characterized in that: A chamfer is formed between the annular groove (4), the groove outer wall (5) and the piston top wall (2).