Rubber diaphragm for control valve

Abstract

The utility model relates to the technical field of rubber membranes, and particularly discloses a rubber membrane for a control valve, which comprises a rubber main body, the top of the rubber main body is adhered with a woven fabric layer through a first adhesive layer, and the bottom of the rubber main body is provided with a sleeve groove; the first metal framework comprises a vertical rod body and an integrally formed rod cap, the rod cap is embedded into the sleeve groove, and a second adhesive layer is arranged between the inner wall of the sleeve groove and the rod cap; a through hole is formed in the top of the second metal framework to press the rod body, and a supporting sleeve is integrally formed on the outer wall of the second metal framework; an outer arc-shaped annular edge protruding downwards, an inner arc-shaped annular edge and an arc-shaped annular groove sunken upwards are arranged at the bottom of the rubber body, and the arc-shaped annular groove is located between the outer arc-shaped annular edge and the inner arc-shaped annular edge. Through structural innovation and material modification, the comprehensive performance of the rubber diaphragm is improved, the environmental adaptability is enhanced, the maintenance cost is reduced, the control precision is improved, and a key technical support is provided for localization of a high-end control valve.

Description

Technical Field

[0001] This utility model relates to the field of rubber diaphragm technology, and specifically discloses a rubber diaphragm for use in control valves. Background Technology

[0002] In the field of industrial automation control, control valves, as key components of fluid systems, have their control accuracy and service life directly affected by the performance of their core sealing component, the rubber diaphragm. Traditional rubber diaphragms generally suffer from the following technical bottlenecks:

[0003] Single rubber material is prone to fatigue fracture during high-frequency reciprocating motion, especially under high pressure differential conditions, the top of the diaphragm is prone to local tearing due to the impact of the medium pressure.

[0004] The bonding interface between the metal skeleton and the rubber body often fails due to stress concentration. Existing adhesive bonding processes rely on surface roughening treatment, and the bonding strength decreases significantly after long-term service.

[0005] Traditional planar sealing structures are prone to displacement under alternating loads, leading to media leakage. Furthermore, they lack effective mechanical positioning structures, and eccentric wear is likely to occur when the diaphragm deforms.

[0006] High friction loss: Insufficient lubrication at the mating surfaces of metal parts and rubber causes dry friction, which accelerates diaphragm aging. Especially under high temperature and high pressure conditions, the increased coefficient of friction leads to lag in control response. Utility Model Content

[0007] This utility model proposes a rubber diaphragm for control valves. Through multi-dimensional technological innovations such as multi-layer composite structure design and mechanical interlocking connection, it achieves a comprehensive improvement in the tensile strength, fatigue resistance and sealing reliability of the rubber diaphragm, enhances environmental adaptability, reduces maintenance costs, and improves the control accuracy of the control valve, providing key technical support for the localization of high-end control valves.

[0008] This invention is implemented as follows: a rubber diaphragm for controlling a valve, comprising:

[0009] A rubber body, with a woven fabric layer bonded to its top by a first adhesive layer, and a sleeve groove provided at the bottom of the rubber body;

[0010] The first metal frame includes a vertical rod and an integrally formed rod cap, wherein the rod cap is embedded in a sleeve groove, and a second adhesive layer is provided between the inner wall of the sleeve groove and the rod cap;

[0011] The second metal frame has a through hole at the top for pressing the rod body, and its outer wall is integrally formed with a support sleeve.

[0012] The bottom of the rubber body is provided with a downwardly protruding outer arc-shaped annular ridge, an inner arc-shaped annular ridge, and an upwardly recessed arc-shaped annular groove, the arc-shaped annular groove being located between the outer arc-shaped annular ridge and the inner arc-shaped annular ridge;

[0013] The upper end of the support sleeve is provided with a positioning groove that matches the inner arc-shaped annular ridge, and the lower end of the inner arc-shaped annular ridge is embedded in the positioning groove to form a mechanical interlock.

[0014] As a preferred embodiment of the rubber diaphragm for control valves according to this utility model, the inner wall of the sleeve groove and the surface of the rod cap are provided with micro-pits by a laser array. The micro-pits have a diameter of 50-80μm, a depth of 20-30μm, and a spacing of 100-150μm.

[0015] As a preferred embodiment of the rubber diaphragm for a control valve according to this utility model, the cross-section of the arc-shaped annular groove is an asymmetrical semi-circle.

[0016] As a preferred embodiment of the rubber diaphragm for control valves according to this utility model, the woven layer is an aramid fiber impregnated with HNBR resin structure with a thickness of 0.3±0.05mm.

[0017] As a preferred embodiment of the rubber diaphragm for a control valve according to this utility model, the inner arc-shaped annular ridge and the mating surface of the positioning groove are coated with a molybdenum disulfide solid lubricating film with a film thickness of 5-10 μm.

[0018] As a preferred embodiment of the rubber diaphragm for a control valve according to this utility model, the second adhesive layer is a phenolic resin-chloroprene rubber composite adhesive.

[0019] The beneficial effects of this utility model are:

[0020] Through structural innovation and material modification, the tensile strength, fatigue resistance and sealing reliability of the diaphragm are improved simultaneously, meeting the high sealing requirements of API607 and other standards.

[0021] It can work stably in a temperature range of -40℃ to 200℃ and a pressure range of 0-15MPa, adapting to harsh working conditions such as chemical and energy industries;

[0022] Furthermore, the mechanical interlock and reinforced connection design extend the average replacement cycle from 6 months to more than 2 years, reducing the frequency of downtime maintenance;

[0023] Meanwhile, the low-friction design and precise positioning structure ensure that the valve response time is ≤0.2 seconds and the control accuracy error is <1%, meeting the requirements for precision adjustment. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0026] Figure 2 for Figure 1 A magnified structural diagram of point A in the middle.

[0027] Figure 3 for Figure 1 A magnified structural diagram at point B in the middle.

[0028] Figure 4 for Figure 1 A magnified structural diagram at point C.

[0029] Figure 5 This is a top view of the pole cap of this utility model.

[0030] The markings in the diagram are: 1. Rubber body; 2. First adhesive layer; 3. Fabric layer; 4. Sleeve groove; 5. First metal skeleton; 6. Rod body; 7. Rod cap; 8. Second adhesive layer; 9. Second metal skeleton; 10. Through hole; 11. Support sleeve; 12. Outer arc-shaped annular ridge; 13. Inner arc-shaped annular ridge; 14. Arc-shaped annular groove; 15. Positioning groove; 16. Micro-pit; 17. Molybdenum disulfide solid lubricating film. Detailed Implementation

[0031] 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.

[0032] Please see Figure 1-5 A rubber diaphragm for controlling a valve, comprising:

[0033] The rubber body 1 has a fabric layer 3 bonded to its top by a first adhesive layer 2, and a sleeve groove 4 is provided at the bottom of the rubber body 1.

[0034] The first metal frame 5 includes a vertical rod 6 and an integrally formed rod cap 7. The rod cap 7 is embedded in the sleeve groove 4, and a second adhesive layer 8 is provided between the inner wall of the sleeve groove 4 and the rod cap 7.

[0035] The second metal frame 9 has a through hole 10 at the top for press-fitting the rod body 6, and its outer wall is integrally formed with a support sleeve 11.

[0036] The bottom of the rubber body 1 is provided with an outer arc-shaped annular ridge 12 that protrudes downward, an inner arc-shaped annular ridge 13, and an arc-shaped annular groove 14 that is recessed upward. The arc-shaped annular groove 14 is located between the outer arc-shaped annular ridge 12 and the inner arc-shaped annular ridge 13.

[0037] The upper end of the support sleeve 11 is provided with a positioning groove 15 that is adapted to the inner arc-shaped annular rib 13, and the lower end of the inner arc-shaped annular rib 13 is embedded in the positioning groove 15 to form a mechanical interlock.

[0038] In this embodiment: the medium pressure acts on the fabric layer 3 on top of the rubber body 1 through the valve body. When the diaphragm deforms downward, the rod 6 of the first metal skeleton 5 passes through the through hole 10 of the second metal skeleton 9 to transmit thrust and drive the valve stem to move. The outer arc-shaped annular ridge 12 is tightly fitted with the sealing surface of the inner wall of the valve body to form the first seal. The inner arc-shaped annular ridge 13 is embedded in the positioning groove 15 of the support sleeve 11 to achieve mechanical interlocking and restrict the radial movement of the diaphragm. The middle arc-shaped annular groove 14 absorbs deformation stress and avoids local overload. The molybdenum disulfide lubricating film forms a solid lubricating layer on the mating surface of the positioning groove 15 to reduce friction loss when the metal and rubber move relative to each other. The laser micro-pit 16 increases the bonding surface area between the sleeve groove 4 and the rod cap 7. The composite adhesive ensures a reliable connection between the metal skeleton and the rubber body 1 through the dual effects of chemical cross-linking and physical anchoring.

[0039] The rubber body 1 serves as the basic elastic support. The top fabric layer 3 enhances the tensile strength, and the bottom structure achieves sealing and positioning. The outer arc-shaped annular ridge 12 and the inner arc-shaped annular ridge 13, together with the arc-shaped annular groove 14, form a three-level sealing structure to improve the resistance to media penetration.

[0040] The first metal frame 5 rod cap 7 is embedded in the sleeve groove 4, and a reliable connection is achieved through the second adhesive layer 8 and the laser micro pit 16 array;

[0041] The support sleeve 11 of the second metal frame 9 and the inner arc-shaped annular ridge 13 form a positioning groove 15 for mechanical interlocking.

[0042] As a technical optimization of this utility model, the inner wall of the sleeve groove 4 and the surface of the rod cap 7 are provided with micro-pits 16 by laser array. The micro-pits 16 have a diameter of 50-80μm, a depth of 20-30μm, and a spacing of 100-150μm.

[0043] In this embodiment, the surface micro-nano structure modification of the laser micro-pit 16 array enhances the bonding force at the bonding interface, increasing the bonding strength from 5N / mm in traditional sandblasting to 8N / mm, and increasing the number of cyclic loads by 50%.

[0044] As a technical optimization of this utility model, the cross-section of the arc-shaped annular groove 14 is an asymmetrical semi-circle.

[0045] In this embodiment, the asymmetrical semi-circular cross-sectional shape adapts to the stress distribution, which can reduce stress concentration during diaphragm deformation and delay fatigue crack initiation time by 40%.

[0046] As a technical optimization of this utility model, the woven layer 3 is an aramid fiber impregnated with HNBR paste structure with a thickness of 0.3±0.05mm.

[0047] In this embodiment: the aramid fiber impregnated with HNBR adhesive structure is bonded to the rubber body 1 through the first adhesive layer 2, which enhances the tear resistance of the top of the diaphragm and withstands high-frequency pressure impact. The thickness is controlled at 0.3±0.05mm to achieve a balance between strength and flexibility, further improving the impact resistance of the top.

[0048] As a technical optimization of this utility model, the mating surfaces of the inner arc-shaped annular ridge 13 and the positioning groove 15 are coated with a molybdenum disulfide solid lubricating film 17 with a film thickness of 5-10μm.

[0049] In this embodiment, the thickness of the molybdenum disulfide solid lubricating film 17 is 5-10 μm, forming a lubricating layer with a low coefficient of friction (≤0.15), reducing adhesive wear between metal and rubber, and adapting to high-temperature working conditions below 200°C.

[0050] As a technical optimization of this utility model, the second adhesive layer 8 is a phenolic resin-chloroprene rubber composite adhesive.

[0051] In this embodiment, the phenolic resin-chloroprene rubber composite adhesive combines the high temperature resistance of phenolic resin (withstanding long-term use at 150°C) with the flexibility of chloroprene rubber, solving the problems of "hardening and embrittlement" or "high temperature creep" of traditional adhesives, and extending the bonding failure time by 3 times under temperature cycling from -40°C to 150°C.

[0052] Working principle and usage process of this utility model:

[0053] The rod cap 7 of the first metal skeleton 5 is coated with phenolic resin-chloroprene rubber adhesive and embedded in the bottom groove 4 of the rubber body 1. The surface of the laser micro-pit 16 and the inner wall of the groove 4 form a composite connection of "adhesive filling-micro-pit 16 anchoring". The positioning groove 15 of the support sleeve 11 of the second metal skeleton 9 is aligned with the inner arc-shaped annular ridge 13 of the rubber body 1. The lower end of the inner arc-shaped annular ridge 13 is embedded in the positioning groove 15 through the press-fitting process to complete the mechanical interlocking. The fabric layer 3 is pre-adheded to the top of the rubber body 1 through the first adhesive layer 2 to form a composite reinforcement layer.

[0054] Work phase:

[0055] When the pressure of the medium upstream of the control valve increases, the top of the diaphragm bends downward under pressure, the fabric layer 3 resists tensile deformation, and the first metal skeleton 5 drives the valve stem to move; the inner arc-shaped annular ridge 13 slides slightly in the positioning groove 15, the molybdenum disulfide lubricating film reduces frictional resistance, and the outer arc-shaped annular ridge 12 maintains sealed contact with the valve body; when the pressure is released, the diaphragm returns to its original shape under its own elasticity and the action of the reset mechanism, and the elastic potential energy stored in the arc-shaped annular groove 14 assists in rapid reset and reduces hysteresis.

[0056] 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.

[0057] 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 rubber diaphragm for use in a control valve, characterized in that, include: A rubber body (1) has a fabric layer (3) bonded to its top by a first adhesive layer (2), and a sleeve groove (4) is provided at the bottom of the rubber body (1). The first metal frame (5) includes a vertical rod (6) and an integrally formed rod cap (7). The rod cap (7) is embedded in a sleeve groove (4), and a second adhesive layer (8) is provided between the inner wall of the sleeve groove (4) and the rod cap (7). The second metal frame (9) has a through hole (10) at the top for press-fitting the rod body (6), and its outer wall is integrally formed with a support sleeve (11). The bottom of the rubber body (1) is provided with an outwardly protruding outer arc-shaped annular ridge (12), an inner arc-shaped annular ridge (13), and an upwardly recessed arc-shaped annular groove (14), the arc-shaped annular groove (14) being located between the outer arc-shaped annular ridge (12) and the inner arc-shaped annular ridge (13); The upper end of the support sleeve (11) is provided with a positioning groove (15) that is adapted to the inner arc-shaped annular ridge (13), and the lower end of the inner arc-shaped annular ridge (13) is embedded in the positioning groove (15) to form a mechanical interlock.

2. A rubber diaphragm for a control valve according to claim 1, characterized in that: The inner wall of the sleeve groove (4) and the surface of the rod cap (7) are provided with micro-pits (16) by laser array. The micro-pits (16) have a diameter of 50-80μm, a depth of 20-30μm, and a spacing of 100-150μm.

3. A rubber diaphragm for a control valve according to claim 1, characterized in that: The cross-section of the arc-shaped annular groove (14) is an asymmetrical semi-circle.

4. A rubber diaphragm for a control valve according to claim 1, characterized in that: The fabric layer (3) is an aramid fiber impregnated with HNBR paste structure with a thickness of 0.3±0.05mm.

5. A rubber diaphragm for a control valve according to claim 1, characterized in that: The inner arc-shaped annular ridge (13) and the positioning groove (15) are coated with a molybdenum disulfide solid lubricating film (17) with a thickness of 5-10 μm.

6. A rubber diaphragm for a control valve according to claim 1, characterized in that: The second adhesive layer (8) is a phenolic resin-chloroprene rubber composite adhesive.

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