Valve plate of air valve of compressor

Abstract

The utility model discloses a compressor air valve plate which comprises a valve plate body, an inner-layer structure and an outer-layer structure, the outer-layer structure wraps the outer side of the inner-layer structure, a plurality of protruding columns are arranged on the two sides of the inner-layer structure and protrude out of the surface of the outer-layer structure, a plurality of through holes distributed in an array mode are formed in the valve plate body, and the outer-layer structure wraps the outer-layer structure. According to the utility model, the outer layer structure with excellent corrosion resistance wraps the inner layer structure with high mechanical strength, so that the valve plate has excellent corrosion resistance and keeps the high strength characteristic of PEEK (Polyether Ether Ketone) at the same time.

Description

Technical Field

[0001] The utility model discloses a compressor air valve disc, belonging to the technical field of compressor accessories. Background Art

[0002] The exhaust valve is an important component in a compressor, playing a crucial role in the working stability, compression effect and service life of the compressor. Currently, the materials selected for the exhaust valve disc on air compressors are basically stainless steel, aluminum-based alloy, polyurethane, polytetrafluoroethylene, etc. These materials play different roles under different working conditions.

[0003] As a special engineering plastic, polyetheretherketone (PEEK) has been widely studied and applied in manufacturing the valve disc of compressor air valves due to its excellent physical, chemical and mechanical properties. It has many advantages that cannot be compared with many metal materials:

[0004] (1) High temperature resistance: The long-term service temperature of fiber-reinforced PEEK can reach 260 °C; (2) Abrasion resistance: Due to its small density and light weight, the impact force in a reciprocating compressor is reduced, extending the service life of the air valve; (3) Corrosion resistance: Except for oxygen, chlorine and concentrated sulfuric acid, PEEK is almost corrosion-resistant to all media. In particular, fluorine-containing PEEK composite materials have excellent corrosion resistance; (4) Low noise: PEEK materials can absorb part of the impact energy and reduce noise; (5) High safety: PEEK valve discs have good toughness and are not easy to break. Even if they break, they will not cause damage to the air valve or generate sparks; (6) Hydrolysis resistance: It is not affected by water and high-pressure steam and maintains its mechanical properties.

[0005] However, in special working conditions such as strong acids and alkalis, PEEK is inevitably faced with a dilemma between strength and corrosion resistance: Fluorine-containing PEEK composite materials have poor mechanical properties, and conventional inorganic filler-reinforced PEEK composite materials are difficult to withstand corrosion. This makes it increasingly difficult for single-ratio PEEK composite materials to meet the performance requirements of valve disc materials under special working conditions.

[0006] In view of the above situation, this application designs a layer structure realized by a secondary injection molding process, as well as a series of supporting PEEK composite materials to meet the performance requirements of PEEK valve discs under acid-base corrosion working conditions. Content of the Utility Model

[0007] The purpose of the utility model is to solve the problems in the prior art and provide a compressor air valve disc.

[0008] The present utility model achieves the above object through the following technical solutions. A compressor valve plate includes a valve plate body. The valve plate body includes an inner layer structure and an outer layer structure. The outer layer structure wraps around the outside of the inner layer structure. A plurality of convex columns are provided on both sides of the inner layer structure, and the convex columns protrude to the surface of the outer layer structure. A plurality of through holes distributed in an array are provided on the valve plate body.

[0009] Preferably, the outer layer structure wraps around the surface of the inner layer structure by means of secondary injection molding.

[0010] Preferably, the inner layer structure is injection molded from PEEK resin, a first filler, a release agent, and a dispersant.

[0011] Preferably, the first filler is a fiber filler and a ceramic filler. The fiber filler is one of carbon fiber and glass fiber, and the ceramic filler is one or two of zirconia and titanium dioxide.

[0012] Preferably, the outer layer structure is injection molded from PEEK resin, a second filler, a release agent, and a dispersant.

[0013] Preferably, the second filler is a fluoroplastic, and the fluoroplastic is one or two of polytetrafluoroethylene and perfluoroalkylated compounds.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The outer layer structure provides anti-corrosion protection for the valve plate, and the inner layer structure provides good mechanical properties for the valve plate;

[0016] 2. Both the inner and outer materials are PEEK composite materials, which have the same melting temperature, can make the interface fuse more fully during the processing and forming process, and reduce the structural defects between layers of the valve plate;

[0017] 3. Compared with fluorine-containing PEEK composite materials, fiber-reinforced PEEK composite materials have lower thermal expansion coefficients and molding shrinkage rates. However, the thermal expansion coefficients and molding shrinkage rates of ceramic powder-reinforced PEEK composite materials are similar to those of fluorine PEEK composite materials. Using a variety of fillers in combination can further reduce the interlayer stress. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a compressor valve plate of the present utility model.

[0019] Reference numerals: 1, inner layer structure; 2, outer layer structure; 3, convex column; 4, through hole. Detailed Embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] As Figure 1 shown, a compressor valve plate includes a valve plate body. The valve plate body includes an inner layer structure 1 and an outer layer structure 2. The outer layer structure 2 wraps around the outside of the inner layer structure 1. A plurality of convex columns 3 are provided on both sides of the inner layer structure 1, and the convex columns 3 protrude to the surface of the outer layer structure 2. A plurality of through holes 4 are arranged in an array on the valve plate body.

[0022] The outer layer structure 2 wraps around the surface of the inner layer structure 1 by means of secondary injection molding. The inner layer structure 1 is injection molded from PEEK resin, a first filler, a release agent, and a dispersant. The first filler is a fiber filler and a ceramic filler. The fiber filler is one of carbon fiber and glass fiber, and the ceramic filler is one or two of zirconia and titanium dioxide. The outer layer structure 2 is injection molded from PEEK resin, a second filler, a release agent, and a dispersant. The second filler is a fluoroplastic, and the fluoroplastic is one or two of polytetrafluoroethylene and perfluoroalkyl compounds.

[0023] In the traditional method, the valve plate is generally prepared by one-time injection molding of the main material, and polytetrafluoroethylene is electrostatically sprayed on the surface of the main material in the form of powder, and then a protective film is formed on the surface of the main material by heating and melting. However, for the valve plate made by this method, the adhesion between polytetrafluoroethylene PTFE and the main material is poor, resulting in a short service life and poor corrosion resistance.

[0024] The valve plate of the present invention is prepared by a secondary injection molding method. The inner layer structure 1 is mainly composed of PEEK resin, fiber fillers and ceramic fillers, which have good impact resistance and wear resistance, and the outer layer structure 2 is mainly composed of PEEK resin and fluoroplastics, which have good corrosion resistance. In the specific molding process, the inner layer structure 1 is placed in a secondary injection mold after the primary injection molding, wherein the convex column 3 on the surface of the inner layer structure 1 can not only play a positioning effect during the secondary injection molding, but also the convex column 3 is finally flush with the surface of the outer layer structure 2, so that the valve plate conflicts with the installation position of the spring in the air valve, which can provide a better wear-resistant support effect on the spring, and Since both the inner layer structure 1 and the outer layer structure 2 contain PEEK resin, the contact surfaces of the inner layer structure 1 and the outer layer structure 2 can be fused during the secondary injection molding, so that the inner layer structure 1 and the outer layer structure 2 have better adhesion and are not easy to fall off. In addition, after the inner layer structure 1 is molded, sandblasting and roughening will be performed on its surface. During the sandblasting process, the gravel will impact the surface of the inner layer structure 1 to increase the roughness of the surface of the inner layer structure 1, so that the bonding force between the inner layer structure 1 and the outer layer structure 2 can be further increased during the secondary injection molding. At the same time, the fine cracks produced in the inner layer structure 1 after sandblasting and roughening can be repaired during the secondary injection molding, which can reduce the defects of the inner layer structure 1.

[0025] At the same time, since the inner layer structure 1 and the outer layer structure 2 are formed by secondary injection molding, and there are differences in the materials of the two, resulting in different thermal expansion coefficients, in order to ensure the quality of valve plate production, it is necessary to control the thermal expansion coefficients of the inner layer structure 1 material and the outer layer structure 2 material as close as possible, so as to effectively avoid surface cracking when molding the outer layer structure 2. In the material of the inner layer structure 1, the thermal expansion coefficient of the PEEK resin is low after only adding fiber fillers, while the thermal expansion coefficient of the PEEK resin in the material of the outer layer structure 2 is high after adding fluoroplastics. Therefore, it is necessary to add ceramic fillers to the material of the inner layer structure 1, so that the reduction in the thermal expansion coefficient of the fiber filler becomes smaller, so as to prevent stress between layers during the molding process and cause damage. At the same time, the ceramic filler also enriches the inner layer structure 1, so that the impact resistance of the inner layer structure 1 is significantly improved.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0027] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 compressor valve plate, comprising a valve plate body, characterized in that, The valve disc body includes an inner layer structure (1) and an outer layer structure (2). The outer layer structure (2) wraps around the outside of the inner layer structure (1). A plurality of convex columns (3) are provided on both sides of the inner layer structure (1), and the convex columns (3) protrude to the surface of the outer layer structure (2). A plurality of through holes (4) distributed in an array are provided on the valve disc body.

2. The compressor valve disc according to claim 1, wherein The outer layer structure (2) wraps around the surface of the inner layer structure (1) by means of secondary injection molding.

3. A compressor valve disc according to claim 1, characterized in that, The inner layer structure (1) is injection molded from PEEK resin, a first filler, a release agent, and a dispersant.

4. A compressor valve plate according to claim 1, characterized in that, The outer layer structure (2) is injection molded from PEEK resin, a second filler, a release agent, and a dispersant.

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