Piston ring for vacuum pump

Abstract

The utility model discloses a piston ring for a vacuum pump, which relates to the technical field of piston rings and comprises a ring body and a protective component fixedly arranged on the outer side of the ring body. The protection assembly has flexibility; the protection assembly comprises an adhesion increasing layer, a wear-resistant layer and a lubricating layer which are fixedly arranged outside the ring body in sequence; the ring body comprises a split ring and a plurality of groups of ring grooves formed in the two ring ends of the split ring respectively, and the attachment increasing layer is fixedly arranged on the outer side of the split ring and in the plurality of groups of ring grooves at the same time; the utility model has the advantages that the adhesion increasing layer, the wear-resistant layer and the lubricating layer are fixedly arranged in sequence to form the flexible protection assembly, so that the effect of adapting to the bending deformation of the ring body to reduce the cracking possibility can be achieved; and a plurality of groups of ring grooves are formed in the split ring, so that the use of materials can be reduced, and the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of piston ring technology, and more specifically to a piston ring for a vacuum pump. Background Technology

[0002] Piston rings in vacuum pumps generally include two types: gas rings and oil rings. The main function of gas rings is to seal the gap between the piston and the cylinder wall, preventing gas from leaking from the high-pressure side to the low-pressure side, thereby ensuring the working efficiency of the vacuum pump.

[0003] The piston rings in existing vacuum pumps, as shown in application number CN202121375815.X, "A High Wear-Resistant Piston Ring", have three layers of coating on the substrate to improve wear resistance. However, the piston rings are generally broken in order to allow for slight deformation during installation to fit into the mounting ring groove of the piston. The coatings used on the aforementioned piston rings have low flexibility and are prone to cracking during deformation. Utility Model Content

[0004] The purpose of this utility model is to provide a piston ring for a vacuum pump in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] This utility model proposes a piston ring for a vacuum pump, including a ring body and a protective component fixed on its outer side, the ring body being deformable;

[0007] The protective component is flexible;

[0008] The protective component includes an adhesion layer, a wear-resistant layer, and a lubricating layer that are sequentially fixed outside the ring.

[0009] As a preferred embodiment of this invention, the coating layer is a nickel-phosphorus alloy plating layer.

[0010] As a preferred embodiment of this invention, the wear-resistant layer is a first molybdenum disulfide layer.

[0011] As a preferred embodiment of this invention, the lubricating layer is a second molybdenum disulfide layer.

[0012] As a preferred embodiment of the present invention, the ring body includes an open ring and several sets of ring grooves respectively provided on its two ends, and the adhesive layer is simultaneously fixed on the outside of the open ring and in the several sets of ring grooves.

[0013] The beneficial effects of this utility model are as follows:

[0014] By sequentially fixing an adhesion layer, a wear-resistant layer, and a lubricating layer to form a flexible protective component, it can adapt to the bending deformation of the ring body to reduce the possibility of cracking; setting several sets of ring grooves on the open ring can reduce the use of materials and save costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure.

[0017] Reference numerals: Ring body-1, Protective component-2, Open ring-11, Ring groove-12, Reinforcing layer-21, Wear-resistant layer-22, Lubricating layer-23. Detailed Implementation

[0018] like Figures 1-2 As shown, this utility model proposes: a piston ring for a vacuum pump, including a ring body 1 and a protective component 2 fixed on its outer side. The ring body 1 is deformable and is made of spring steel or stainless steel to provide a certain bending deformation capability.

[0019] The protective component 2 is flexible and is attached to the outside of the ring 1 for protection, while also adapting to the bending deformation of the ring 1.

[0020] The protective component 2 includes an adhesion layer 21, a wear-resistant layer 22, and a lubrication layer 23, which are sequentially fixed outside the ring body 1. The adhesion layer 21 serves as the bottom layer to improve the stability between the wear-resistant layer 22 and the ring body 1. The wear-resistant layer 22 serves as the wear-resistant layer, while the lubrication layer 23 provides a low coefficient of friction to assist the wear-resistant layer 22 in reducing wear.

[0021] Among them, the reinforcement layer 21 is a nickel-phosphorus alloy coating. The nickel-phosphorus alloy coating is deposited on the outside of the ring 1 by electroplating, which can improve the bonding force between the subsequent wear-resistant layer 22 and the ring 1. The electroplating method makes it easy to control the composition. By setting a nickel-phosphorus alloy coating with high phosphorus content, it exhibits good corrosion resistance and a certain degree of toughness to adapt to the bending deformation of the ring 1.

[0022] The wear-resistant layer 22 is a first molybdenum disulfide (MoS2) layer, which provides wear resistance and reduces the coefficient of friction, while absorbing some mechanical stress through its unique layered structure. This molybdenum disulfide layer is formed using physical vapor deposition (PVD) or chemical vapor deposition (CVD) technology, which can generate a relatively dense and uniform film. The molybdenum disulfide layer has a unique layered crystal structure, which allows interlayer sliding and maintains a certain level of flexibility even when it is thick.

[0023] The lubricating layer 23 is a second molybdenum disulfide layer, which provides lubrication and reduces surface wear, thereby improving the sliding performance of the surface; the molybdenum disulfide layer is applied by spraying or brushing to more easily form a continuous lubricating film layer.

[0024] The ring body 1 includes an open ring 11 and several sets of annular grooves 12 respectively provided on its two ends. The reinforcement layer 21 is simultaneously fixed on the outside of the open ring 11 and inside the several sets of annular grooves 12, such as Figure 2 As shown, multiple sets of annular grooves 12 are symmetrically distributed at the top and bottom ends of the open ring 11. These multiple sets of annular grooves 12 do not connect the inner and outer ends of the open ring 11. This allows for the grooving of the side of the ring body 1 without changing the overall wear-resistant contact surface, thereby reducing material usage and saving costs.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A piston ring for a vacuum pump, comprising a ring body (1) and a protective assembly (2) fixed to its outer side, wherein the ring body (1) is deformable; Its features are, The protective component (2) is flexible; The protective component (2) includes an adhesion layer (21), a wear-resistant layer (22) and a lubricating layer (23) that are sequentially fixed outside the ring (1).

2. The piston ring for a vacuum pump according to claim 1, characterized in that, The coating layer (21) is a nickel-phosphorus alloy coating.

3. A piston ring for a vacuum pump according to claim 2, characterized in that, The wear-resistant layer (22) is the first molybdenum disulfide layer.

4. A piston ring for a vacuum pump according to claim 3, characterized in that, The lubricating layer (23) is a second molybdenum disulfide layer.

5. A piston ring for a vacuum pump according to claim 4, characterized in that, The ring body (1) includes an open ring (11) and several sets of ring grooves (12) respectively provided on its two ends. The reinforcement layer (21) is fixed on the outside of the open ring (11) and inside the several sets of ring grooves (12).

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