Diaphragm valve

Abstract

The utility model provides a diaphragm valve which comprises a valve body, a valve cover and a diaphragm, the diaphragm is arranged between the valve cover and the valve body, and the valve cover is fixed at the upper end of the valve body through a plurality of bolt assemblies which are distributed at intervals in the circumferential direction and tightly presses the outer edge of the diaphragm on the valve body. Bolt holes vertically corresponding to the bolt assemblies one to one are formed in the edge of the diaphragm, a metal ring is arranged on the inner side of each bolt hole, the height of each metal ring is smaller than the thickness of the diaphragm, the upper end and the lower end of each metal ring are located on the inner side of the diaphragm, and each metal ring is used for allowing the bolt assembly in the corresponding position to vertically penetrate through. When the valve cover and the valve body are fastened through the bolt assembly, the upper end and the lower end of the metal ring abut against the lower end of the valve cover and the upper end of the valve body respectively. According to the utility model, the situation that the diaphragm is excessively extruded by the valve cover and the valve body can be avoided, namely the situation that the diaphragm is extruded and damaged can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a diaphragm valve. Background Art

[0002] The diaphragm valve is a valve body and a valve cover with a flexible diaphragm or a combination diaphragm, and its closing part is a compression device connected to the diaphragm; the advantage of the diaphragm valve is that its operating mechanism is separated from the medium circuit, which not only ensures the purity of the working medium, but also prevents the possibility of the medium in the pipeline impacting the working parts of the operating mechanism. In addition, no separate seal is required at the valve stem. In the diaphragm valve, since the working medium contacts only the diaphragm and the valve body, both of which can be made of a variety of different materials, the valve can ideally control a variety of working media, especially for media with chemical corrosion or suspended particles. The operating temperature of the diaphragm valve is usually limited by the materials used for the diaphragm and the valve body lining. Its operating temperature range is about -50 to 150 ° C, and the diaphragm valve is easy to disassemble and repair quickly, and the replacement of the diaphragm can be completed on site in a short time.

[0003] The diaphragm valves currently on the market generally include a valve body, a valve cover and a diaphragm. The diaphragm is arranged between the valve cover and the valve body. The valve cover is fixed to the upper end of the valve body by a plurality of bolt assemblies distributed at circumferential intervals and presses the outer edge of the diaphragm onto the valve body. Bolt holes corresponding vertically to each bolt assembly are arranged at the edge of the diaphragm. However, in the above-mentioned diaphragm valve structure, since the diaphragm is generally made of rubber material, when the bolt assembly is used to fix the valve cover and the valve body, that is, when the valve cover and the valve body squeeze the edge of the diaphragm, it is easy to cause excessive squeezing of the edge of the diaphragm, that is, it is easy to cause damage to the diaphragm. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a diaphragm valve, which can prevent the valve cover and the valve body from over-squeezing the diaphragm, that is, can effectively prevent the diaphragm from being squeezed and damaged.

[0005] The utility model provides a diaphragm valve, comprising a valve body, a valve cover and a diaphragm, the diaphragm is arranged between the valve cover and the valve body, the valve cover is fixed to the upper end of the valve body by a plurality of bolt assemblies distributed at circumferential intervals and presses the outer edge of the diaphragm onto the valve body, bolt holes corresponding vertically to each bolt assembly are arranged at the edge of the diaphragm, a metal ring is arranged on the inner side of each bolt hole, the height of the metal ring is less than the thickness of the diaphragm and the upper and lower ends of the metal ring are located on the inner side of the diaphragm, each metal ring is used for the bolt assembly at the corresponding position to pass vertically, when the valve cover and the valve body are fastened by the bolt assembly, the upper end and the lower end of the metal ring are respectively abutted against the lower end of the valve cover and the upper end of the valve body.

[0006] The utility model embeds a metal ring in the bolt hole. When the bolt assembly fixes the valve cover and the valve body and squeezes the diaphragm, the edge of the diaphragm is deformed to a certain extent and fits tightly against the valve cover and the valve body. The upper and lower ends of the metal ring can finally abut against the valve cover and the valve body respectively, thereby preventing the valve cover and the valve body from excessively squeezing the diaphragm, thereby effectively preventing the diaphragm from being squeezed and damaged.

[0007] In a possible embodiment, an annular convex edge is provided on the outer wall of each metal ring, an annular groove is provided on the hole wall of each bolt hole, and each annular convex edge is engaged with the annular groove at the corresponding position; by adopting this structure, each metal ring can be reliably and conveniently assembled in the bolt hole at the corresponding position, and axial displacement of the metal ring relative to the bolt hole can be avoided, and the metal ring can be avoided from being separated from the bolt hole.

[0008] In a possible implementation, the annular flange is located in the middle of the metal ring in the axial direction, and the annular groove is located in the middle of the bolt hole in the axial direction. By adopting this structure, the metal ring can be limited in the middle of the bolt hole in the axial direction, so that when the valve cover and the valve body squeeze the diaphragm located at the position of the metal ring, the valve cover and the valve body can reliably squeeze the diaphragm located above and below the metal ring, and the diaphragm located at the position of the metal ring can be reliably tightly attached to the valve cover and the valve body.

[0009] In a possible embodiment, an annular chamfered surface is provided on the inner wall of the upper end and the inner wall of the lower end of each bolt hole; after the annular chamfered surface is provided on the inner wall of the upper end and the inner wall of the lower end of each bolt hole, when the valve cover and the valve body squeeze the diaphragm located at the position of the metal ring, the diaphragm located above and below the metal ring and at the edge of the bolt hole can be deformed toward the inner side of the annular chamfered surface to avoid abnormal extrusion of the diaphragm; in addition, under the action of the annular chamfered surface, the metal ring is easy to embed into the bolt hole.

[0010] In a possible embodiment, a downwardly extending annular boss is provided at the outer edge of the lower end of the valve cover, and the diaphragm is located on the inner side of the annular boss; by adopting this structure, when the bolt assembly fastens the valve cover and the valve body, that is, after the diaphragm is squeezed by the valve cover and the valve body, the outer edge of the diaphragm can always be limited to the inner side of the annular boss, thereby improving the tight sealing effect between the diaphragm and the valve cover and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0013] Figure 3 It is a cross-sectional structural schematic diagram of the utility model;

[0014] Figure 4 for Figure 3 The schematic diagram of the structure after the enlargement of A in the middle;

[0015] Figure 5 It is a schematic diagram of the three-dimensional structure after the metal ring and the diaphragm are assembled. DETAILED DESCRIPTION

[0016] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0017] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0018] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0019] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See also Figure 1-5As shown, an embodiment of the present application discloses a diaphragm valve, comprising a valve body 1, a valve cover 2 and a diaphragm 3, wherein the diaphragm 3 is arranged between the valve cover 2 and the valve body 1, and the valve cover 2 is fixed to the upper end of the valve body 1 by a plurality of bolt assemblies 4 distributed at circumferential intervals and presses the outer edge of the diaphragm 3 onto the valve body 1, and bolt holes 31 corresponding vertically to each bolt assembly 4 are arranged at the edge of the diaphragm 3, and a metal ring 5 is arranged on the inner side of each bolt hole 31, and the height of the metal ring 5 is less than the thickness of the diaphragm 3 and the upper and lower ends of the metal ring 5 are located on the inner side of the diaphragm 3, and each metal ring 5 is used for vertically passing the bolt assembly 4 at the corresponding position, and when the valve cover 2 and the valve body 1 are fastened by the bolt assembly 4, the upper end and the lower end of the metal ring 5 are respectively abutted against the lower end of the valve cover 2 and the upper end of the valve body 1.

[0021] An annular flange 51 is provided on the outer wall of each metal ring 5, and an annular groove 32 is provided on the hole wall of each bolt hole 31, and each annular flange 51 is engaged with the annular groove 32 at the corresponding position; by adopting this structure, each metal ring can be reliably and conveniently assembled in the bolt hole at the corresponding position, and the axial displacement of the metal ring relative to the bolt hole can be avoided, and the metal ring can be prevented from being separated from the bolt hole.

[0022] The annular flange 51 is located in the middle of the metal ring 5 in the axial direction, and the annular groove 32 is located in the middle of the bolt hole 31 in the axial direction. By adopting this structure, the metal ring can be limited in the middle of the bolt hole in the axial direction, so that when the valve cover and the valve body squeeze the diaphragm located at the position of the metal ring, the valve cover and the valve body can reliably squeeze the diaphragm located above and below the metal ring, and the diaphragm located at the position of the metal ring can be reliably tightly attached to the valve cover and the valve body.

[0023] An annular chamfered surface 33 is provided on the inner wall of the upper end and the inner wall of the lower end of each bolt hole 31; after the annular chamfered surface is provided on the inner wall of the upper end and the inner wall of the lower end of each bolt hole, when the valve cover and the valve body squeeze the diaphragm located at the position of the metal ring, the diaphragm located above and below the metal ring and at the edge of the bolt hole can be deformed toward the inner side of the annular chamfered surface to avoid abnormal extrusion of the diaphragm; in addition, under the action of the annular chamfered surface, the metal ring is easy to be embedded in the bolt hole.

[0024] A downwardly extending annular boss 21 is provided at the outer edge of the lower end of the valve cover 2, and the diaphragm 3 is located on the inner side of the annular boss 21. By adopting this structure, when the bolt assembly tightens the valve cover and the valve body, that is, after the diaphragm is squeezed by the valve cover and the valve body, the outer edge of the diaphragm can always be limited to the inner side of the annular boss, thereby improving the tight sealing effect between the diaphragm and the valve cover and the valve body.

[0025] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A diaphragm valve, comprising a valve body (1), a valve cover (2) and a diaphragm (3), wherein the diaphragm (3) is arranged between the valve cover (2) and the valve body (1), the valve cover (2) is fixed to the upper end of the valve body (1) by a plurality of bolt assemblies (4) distributed at circumferential intervals and presses the outer edge of the diaphragm (3) onto the valve body (1), and bolt holes (31) corresponding vertically to each of the bolt assemblies (4) are arranged at the edge of the diaphragm (3), characterized in that: A metal ring (5) is provided on the inner side of each of the bolt holes (31); the height of the metal ring (5) is less than the thickness of the diaphragm (3) and the upper and lower ends of the metal ring (5) are located on the inner side of the diaphragm (3); each of the metal rings (5) is used for allowing a bolt assembly (4) at a corresponding position to pass vertically; when the valve cover (2) and the valve body (1) are fastened by the bolt assembly (4), the upper end and the lower end of the metal ring (5) are respectively abutted against the lower end of the valve cover (2) and the upper end of the valve body (1).

2. The diaphragm valve according to claim 1, characterized in that: An annular convex edge (51) is provided on the outer wall of each metal ring (5), an annular embedding groove (32) is provided on the hole wall of each bolt hole (31), and each annular convex edge (51) is embedded in the annular embedding groove (32) at a corresponding position.

3. The diaphragm valve according to claim 2, characterized in that: The annular convex edge (51) is located in the middle of the metal ring (5) in the axial direction, and the annular embedding groove (32) is located in the middle of the bolt hole (31) in the axial direction.

4. The diaphragm valve according to claim 3, characterized in that: An annular chamfered surface (33) is provided on the inner wall of the upper end and the inner wall of the lower end of each bolt hole (31).

5. The diaphragm valve according to any one of claims 1 to 4, characterized in that: An annular boss (21) extending downward is provided at the outer edge of the lower end of the valve cover (2), and the diaphragm (3) is located on the inner side of the annular boss (21).

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