Rubber diaphragm of pneumatic pressure reducing valve

Abstract

The utility model relates to the technical field of fireproof coating preparation, and particularly discloses a pneumatic pressure reducing valve rubber diaphragm which comprises a lower rubber layer, an upper rubber layer is arranged on the upper end face of the lower rubber layer, and a reinforced woven fabric layer is arranged between the lower rubber layer and the upper rubber layer. A metal framework is arranged in the center of the lower rubber layer, the center of the upper rubber layer and the center of the reinforced woven fabric layer in a penetrating mode, the step interlocking type metal framework design is combined with the high-performance aramid fiber reinforced layer and the double-layer heterogeneous rubber structure, and the core performance of the diaphragm is remarkably improved; the industrial problem that a metal and rubber interface is easy to separate under alternating stress is effectively solved, the interlayer bonding strength and the overall structure reliability are greatly enhanced, and meanwhile, the stress concentration phenomenon of the framework edge is relieved, so that the risk of rubber fatigue cracking is remarkably reduced, the service life of the rubber diaphragm is greatly prolonged, and the service life of the rubber diaphragm is prolonged. The reliability of long-term work of the pneumatic pressure reducing valve and the accuracy and stability of pressure control are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of rubber diaphragm technology, and specifically discloses a rubber diaphragm for a pneumatic pressure reducing valve. Background Technology

[0002] As a key component of industrial fluid control systems, pneumatic pressure reducing valves rely on a core actuator, the rubber diaphragm, which performs both pressure regulation and sealing functions. These diaphragms are typically composed of a composite of an elastic rubber layer, reinforcing materials, and a metal skeleton. They achieve pressure stabilization by responding to changes in air pressure through deformation. In various pneumatic equipment, automated production lines, and process control fields, the durability of the diaphragm directly determines the overall lifespan and reliability of the pressure reducing valve.

[0003] The composite diaphragm structure currently widely used in the industry faces significant challenges under long-term dynamic load conditions: due to the difference in material properties, the metal skeleton and rubber matrix are prone to interface separation under alternating stress. The interlayer bonding strength between the reinforcing layer and the rubber is insufficient, which can easily lead to delamination. Especially in the edge area of ​​the skeleton, stress concentration can cause early fatigue cracking of the rubber. These structural defects not only shorten the service life of the diaphragm, but may also cause pressure fluctuations in the control system, affecting the operational stability of industrial equipment. Utility Model Content

[0004] This invention proposes a pneumatic pressure reducing valve rubber diaphragm, which significantly improves the core performance of the diaphragm through a stepped interlocking metal skeleton design combined with a high-performance aramid fiber reinforcement layer and a double-layer heterogeneous rubber structure.

[0005] This utility model is implemented as follows: a pneumatic pressure reducing valve rubber diaphragm includes a lower rubber layer, an upper rubber layer is disposed on the upper end face of the lower rubber layer, a reinforcing fabric layer is disposed between the lower rubber layer and the upper rubber layer, a metal skeleton is disposed through the center of the lower rubber layer, the upper rubber layer and the reinforcing fabric layer, a vertical groove is disposed through the center of the metal skeleton, a radially extending annular flange is fixedly connected to the outer wall of the metal skeleton, and a pressure ring covering the outer wall of the annular flange is fixedly connected to the center of the upper end face of the upper rubber layer.

[0006] As a preferred embodiment of the pneumatic pressure reducing valve rubber diaphragm of this utility model, the cross-section of the annular flange is a stepped surface, and the cross-section of the pressure ring is an inverted stepped surface that matches the annular flange.

[0007] In a preferred embodiment of the pneumatic pressure reducing valve rubber diaphragm of this utility model, the lower rubber layer, the upper rubber layer, and the reinforcing fabric layer are all bonded together by an adhesive between adjacent layers.

[0008] In a preferred embodiment of the pneumatic pressure reducing valve rubber diaphragm of this utility model, the annular flange and the pressure ring are bonded together by an adhesive.

[0009] As a preferred embodiment of the pneumatic pressure reducing valve rubber diaphragm of this utility model, the reinforcing fabric layer is an aramid fiber woven fabric.

[0010] As a preferred embodiment of the pneumatic pressure reducing valve rubber diaphragm of this utility model, the lower rubber layer is nitrile rubber and the upper rubber layer is fluororubber.

[0011] As a preferred embodiment of the pneumatic pressure reducing valve rubber diaphragm of this utility model, the lower rubber layer and the outer edge of the lower end face, as well as the outer edge of the upper end face of the upper rubber layer, are all fixedly connected with convex rings.

[0012] The beneficial effects of this utility model are:

[0013] This invention, through a stepped interlocking metal skeleton design, combined with a high-performance aramid fiber reinforcement layer and a double-layer heterogeneous rubber structure, significantly improves the core performance of the diaphragm, effectively solves the industry problem of easy separation of the metal-rubber interface under alternating stress, greatly enhances the interlayer bonding strength and overall structural reliability, and alleviates the stress concentration phenomenon at the skeleton edge, thereby significantly reducing the risk of rubber fatigue cracking, greatly extending the service life of the rubber diaphragm, and ensuring the long-term reliability of the pneumatic pressure reducing valve and the precise and stable pressure control. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 This is an overall structural diagram of the rubber diaphragm of a pneumatic pressure reducing valve according to this utility model.

[0016] The markings in the diagram are: 1. Lower rubber layer; 2. Upper rubber layer; 3. Reinforcing fabric layer; 4. Metal skeleton; 5. Vertical groove; 6. Annular flange; 7. Pressure ring; 8. Protruding ring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0018] Please see Figure 1A pneumatic pressure reducing valve rubber diaphragm includes a lower rubber layer 1, an upper rubber layer 2 disposed on the upper end face of the lower rubber layer 1, a reinforcing fabric layer 3 disposed between the lower rubber layer 1 and the upper rubber layer 2, a metal skeleton 4 disposed through the center of the lower rubber layer 1, the upper rubber layer 2 and the reinforcing fabric layer 3, a vertical groove 5 disposed through the center of the metal skeleton 4, a radially extending annular flange 6 fixedly connected to the outer wall of the metal skeleton 4, and a pressure ring 7 covering the outer wall of the annular flange 6 fixedly connected to the center of the upper end face of the upper rubber layer 2.

[0019] In this embodiment: the diaphragm consists of a lower rubber layer 1, an upper rubber layer 2, and a reinforcing fabric layer 3 sandwiched between them. The lower rubber layer 1 is nitrile rubber, the upper rubber layer 2 is fluororubber, and the reinforcing fabric layer 3, combined with aramid fiber braid, effectively improves the overall media resistance, mechanical strength, and anti-delamination ability of the diaphragm. A metal frame 4 with vertical grooves 5 is provided through the center of the diaphragm. The vertical grooves 5 facilitate the balanced transmission of media pressure and reduce local stress. An annular flange 6 with a stepped cross-section is fixed to the outer wall of the metal frame 4. The annular flange 6 significantly increases the contact area and mechanical engagement depth with the rubber through its stepped structure. A pressure ring 7 with a matching inverted stepped cross-section is fixed to the center of the upper end face of the upper rubber layer 2 and wrapped and bonded to the outer wall of the annular flange 6. The stepped interlocking structure significantly enhances the bonding strength between the metal and rubber interfaces, forming a mechanical interlocking structure, greatly increasing the contact area and bonding depth between the metal and rubber, significantly improving the interface's shear and peel resistance, effectively dispersing edge stress, and reducing the risk of early rubber cracking caused by stress concentration. The outer edge of the lower end face of the lower rubber layer 1 and the outer edge of the upper end face of the upper rubber layer 2 are both provided with protruding rings 8, which provide additional sealing protection during assembly and pressing. Adjacent layers are bonded with adhesive to ensure the integrity of the structure.

[0020] As a technical optimization of this utility model, the cross-section of the annular flange 6 is a stepped surface, and the cross-section of the pressure ring 7 is an inverted stepped surface that matches the annular flange 6.

[0021] In this embodiment, the stepped surface design forms a mechanical interlocking structure, which greatly increases the contact area and bonding depth between the metal and rubber, significantly improves the interface's shear and peel resistance, effectively disperses edge stress, and reduces the risk of early rubber cracking caused by stress concentration.

[0022] As a technical optimization of this utility model, the lower rubber layer 1, the upper rubber layer 2 and the reinforcing fabric layer 3 are all bonded together by an adhesive between adjacent layers.

[0023] In this embodiment, an adhesive is used to bond the lower rubber layer 1, the reinforcing fabric layer 3, and the upper rubber layer 2, ensuring a firm bond between the layers, preventing interlayer separation and delamination, and improving the overall structure and durability.

[0024] As a technical optimization of this utility model, the annular flange 6 and the pressure ring 7 are bonded together by an adhesive.

[0025] In this embodiment, an additional adhesive is applied on top of the mechanical interlocking to double the bonding strength between the metal skeleton 4 and the upper rubber layer 2, preventing interface separation.

[0026] As a technical optimization of this utility model, the reinforcing fabric layer 3 is an aramid fiber woven fabric.

[0027] In this embodiment, high-strength, high-modulus, and fatigue-resistant aramid fiber woven fabric is used as the reinforcing material, which greatly improves the tensile strength, tear resistance, and dimensional stability of the diaphragm and extends its service life.

[0028] As a technical optimization of this utility model, the lower rubber layer 1 is nitrile rubber and the upper rubber layer 2 is fluororubber.

[0029] In this embodiment: the lower rubber layer 1 is nitrile rubber, which has good oil resistance, and the upper rubber layer 2 is fluororubber, which has excellent weather resistance and high temperature resistance, thereby improving the diaphragm's tolerance to working media (oil, gas) and external environment (ozone, temperature) and optimizing the overall sealing and durability performance.

[0030] As a technical optimization of this utility model, the lower rubber layer 1 and the outer edge of its lower end face and the outer edge of the upper end face of the upper rubber layer 2 are all fixedly connected with a protruding ring 8.

[0031] In this embodiment: when the diaphragm is pressed by the valve body, the convex ring 8 undergoes additional deformation, providing a more reliable edge seal, preventing medium leakage along the edge, and improving the sealing stability of the pressure reducing valve.

[0032] The working principle and usage process of this utility model are as follows: When the pneumatic pressure reducing valve is working, the medium pressure acts on the diaphragm assembly. The pressure mainly acts on the upper rubber layer 2 and the pressure ring 7 area. This force is transmitted through the pressure ring 7 to the annular flange 6 of the metal skeleton 4 that is bonded and interlocked with it, driving the metal skeleton 4 to produce axial displacement. The vertical groove 5 in the center of the metal skeleton 4 allows the medium pressure to act more evenly on both sides of the skeleton, which helps to balance the force. The displacement of the metal skeleton 4 causes the entire composite diaphragm structure to undergo elastic deformation, which strengthens the fabric layer 3 to constrain the excessive deformation of the rubber layer and provides the main structural support and tensile strength. During the reciprocating deformation of the diaphragm, the metal skeleton 4 and the rubber layer are firmly bonded by the stepped interlocking structure and adhesive to resist alternating stress. The convex ring 8 on the outer edge of the diaphragm deforms under the pressure of the valve body to ensure the sealing of this area. The medium contact surface is mainly borne by the oil-resistant lower rubber layer 1, while the upper surface exposed to air is protected by the weather-resistant upper rubber layer 2.

[0033] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0034] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A pneumatic pressure reducing valve rubber diaphragm comprising a lower rubber layer (1), characterised in that: An upper rubber layer (2) is provided on the upper end face of the lower rubber layer (1). A reinforcing fabric layer (3) is provided between the lower rubber layer (1) and the upper rubber layer (2). A metal skeleton (4) is provided through the center of the lower rubber layer (1), the upper rubber layer (2) and the reinforcing fabric layer (3). A vertical groove (5) is provided through the center of the metal skeleton (4). A radially extending annular flange (6) is fixedly connected to the outer wall of the metal skeleton (4). A pressure ring (7) covering the outer wall of the annular flange (6) is fixedly connected to the center of the upper end face of the upper rubber layer (2).

2. A pneumatic pressure reducing valve rubber diaphragm as claimed in claim 1, wherein: The cross-section of the annular flange (6) is a stepped surface, and the cross-section of the pressure ring (7) is an inverted stepped surface that matches the annular flange (6).

3. A pneumatic pressure reducing valve rubber diaphragm as defined in claim 1, wherein: The lower rubber layer (1), the upper rubber layer (2), and the reinforcing fabric layer (3) are all bonded together with each other by an adhesive.

4. A pneumatic pressure reducing valve rubber diaphragm as defined in claim 1, wherein: The annular flange (6) and the pressure ring (7) are bonded together by an adhesive.

5. A pneumatic pressure reducing valve rubber diaphragm as defined in claim 1 wherein: The reinforcing fabric layer (3) is an aramid fiber woven fabric.

6. A pneumatic pressure reducing valve rubber diaphragm as defined in claim 1 wherein: The lower rubber layer (1) is nitrile rubber, and the upper rubber layer (2) is fluororubber.

7. A pneumatic pressure reducing valve rubber diaphragm as defined in claim 1 wherein: The lower rubber layer (1) and the outer edge of its lower end face, as well as the outer edge of the upper end face of the upper rubber layer (2), are all fixedly connected with protruding rings (8).

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