Piston for improving sealing performance of compressor

Abstract

The piston comprises a piston body, a piston top wall and a piston side wall are arranged on the top and the side of the piston body respectively, a circle of annular groove is formed in the edge of the piston top wall, and the side, facing an air cylinder, of the annular groove is a groove outer wall. The outer wall of the groove can deform towards the outer side under the influence of the exhaust pressure of the compressor, and can reset or deform towards the inner side under the influence of suction compression; the groove wall on the outer side of the piston can deform by utilizing the plasticity and the ductility of the metal material of the piston, so that the fit clearance between the piston and a cylinder is reduced in the exhaust working process of the compressor, and the leakage caused by the large clearance between the piston and the cylinder is reduced; meanwhile, in the air suction process of the compressor, the outer circle of the piston keeps the original size or deforms towards the inner side, the fit clearance between the piston and the air cylinder is enlarged, contact between the piston and the air cylinder is reduced, the abrasion possibility is reduced, and the reliability of the piston is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary components of compressors, 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 higher the compressor power and the lower the COP. At the same time, the piston surface wear increases, and the larger the clearance, the more leakage between the piston and the cylinder, the lower the cooling capacity, and ultimately the COP. It also affects a series of problems such as compressor oil discharge. Therefore, the appropriate clearance between the piston and the cylinder is particularly important.

[0003] Pistons are often made of powder metallurgy, with surface phosphating to enhance their strength and wear resistance, preventing piston wear and causing the compressor to seize. The high-speed reciprocating motion of the piston carries both the deformation caused by rising temperatures and the deformation caused by exhaust pressure and the pressure transmitted to the connecting rod by the crankshaft power. These two conditions exacerbate the contact between the piston and the cylinder, leading to wear. To prevent piston wear, the actual assembly and operation process requires selecting the appropriate piston and cylinder to match and reserve clearance to reduce contact between the piston and cylinder. At the same time, the piston and cylinder must be lubricated and sealed with refrigeration oil. Prolonged high-speed motion reduces the viscosity of the refrigeration oil, reducing its lubrication and sealing properties. Ultimately, piston wear or poor sealing can lead to leakage.

[0004] The technical solution of the utility model is to improve the piston structure and improve the loose sealing between the piston and the cylinder caused by the reduction of the viscosity of the refrigeration oil when the piston is running for a long time, so as to increase the cooling capacity of the compressor and thus improve the reliability of the whole machine. Utility Model Content

[0005] In response to 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] In order to achieve the above technical purpose, the technical solution of the utility model is implemented as follows:

[0007] A piston that improves the sealing performance of a compressor;

[0008] The piston for improving the sealing performance of the compressor includes a piston body, the top and side of the piston body are the piston top wall and the piston side wall respectively, 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 outer wall of the groove, and the outer wall of the groove 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.

[0009] Furthermore, the thickness of the outer wall of the groove is smaller than the width of the annular groove.

[0010] 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.

[0011] 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.

[0012] Furthermore, a wear-resistant coating material is provided on the outer wall of the groove.

[0013] Furthermore, the wear-resistant coating material is molybdenum, nickel or vanadium.

[0014] 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.

[0015] Furthermore, the annular groove is aligned with the center of the piston top wall.

[0016] Furthermore, the minimum distances between the annular groove and the piston side wall are all equal.

[0017] Furthermore, a chamfer is formed between the annular groove and the outer wall of the groove and the top wall of the piston.

[0018] 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 outer groove wall 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 gap between the piston and the cylinder; at the same time, during the suction process of the compressor, the outer end face of the annular groove is affected by the suction compression, and the outer circle of the piston retains its 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0020] Figure 1This is a three-dimensional diagram of a piston for improving the sealing performance of a compressor according to an embodiment of the present utility model;

[0021] Figure 2 This is a top view of a piston for improving the sealing performance of a compressor according to an embodiment of the present utility model;

[0022] Figure 3 The invention is a piston for improving the sealing performance of a compressor. Figure 2 Cross-sectional view of the middle AA line during inspiration;

[0023] Figure 4 The invention is a piston for improving the sealing performance of a compressor. Figure 3 A partial enlarged view of point B in the middle;

[0024] Figure 5 The invention is a piston for improving the sealing performance of a compressor. Figure 2 Cross-sectional view of line AA during the exhaust process;

[0025] Figure 6 The invention is a piston for improving the sealing performance of a compressor. Figure 5 A partial enlarged view of point C in the middle;

[0026] In the figure: 1, piston body; 2, piston top wall; 3, piston side wall; 4, annular groove; 5, groove outer wall. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying 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 embodiments described 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 are within the scope of protection of the present invention.

[0028] 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 to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said 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.

[0029] like Figure 1-6 As shown, a piston for improving the sealing performance of a compressor according to an embodiment of the present invention includes 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 compressor exhaust pressure, and can be reset or deformed toward the inside under the influence of the suction compression.

[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, the thickness of the groove outer wall 5 is smaller than the width of the annular groove 4 .

[0031] 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 circle size of the groove outer wall 5 is larger than the outer circle size of the piston body 1 under the influence of exhaust pressure.

[0032] 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 size of the groove outer wall 5 is less than or equal to the outer circumferential size of the piston body 1 under the influence of suction compression.

[0033] 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.

[0034] 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.

[0035] 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 .

[0036] 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.

[0037] 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.

[0038] According to a piston for improving the sealing performance of a compressor described in an embodiment of the present invention, in a specific embodiment, chamfers are formed between the annular groove 4 and the groove outer wall 5 and the piston top wall 2 .

[0039] 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.

[0040] In specific use, the 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.

[0041] 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.

[0042] 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.

[0043] It should be noted that the shape of the annular groove 4 is not fixed, and the U-shaped cross-section is one embodiment, but it is not limited to the U-shaped shape. Solutions that are conducive to external deformation under the influence of pressure are all alternative solutions of this patent.

[0044] To sum up, with the help of the above-mentioned 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 deform slightly 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 gap 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 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.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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 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.

2. A piston for improving the sealing performance of a compressor according to claim 1, characterized in that: The thickness of the groove outer wall (5) is smaller than the width of the annular groove (4).

3. The piston for improving the sealing performance of a compressor according to claim 1, characterized in that: Under the influence of exhaust pressure, the outer circle size of the groove outer wall (5) is larger than the outer circle size of the piston body (1).

4. The 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 groove outer wall (5) 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. The 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).

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