Low flow resistance septum valve

Abstract

This utility model belongs to the field of valve technology, specifically relating to a low-flow-resistance diaphragm valve. The diaphragm valve includes a valve body, a flow-guiding liner, and a flexible diaphragm. A through-flow channel is formed inside the flow-guiding liner, which is sequentially divided into an inlet section with an inlet straight pipe section, a middle valve cavity section, and an outlet section with an outlet straight pipe section. A sealing weir is provided within the middle valve cavity section. The cross-section of the inlet section smoothly expands along the fluid flow direction, while the cross-section of the outlet section smoothly contracts along the fluid flow direction. The inner wall surfaces of the inlet section, the middle valve cavity section, and the outlet section are continuously and smoothly connected. This utility model, through the aforementioned smoothly expanding, contracting, and continuously smooth flow channel structure, effectively reduces fluid flow resistance, minimizes eddies and energy loss, and is suitable for applications requiring high fluid transport efficiency and cleanliness.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a low-flow-barrier diaphragm valve. Background Technology

[0002] Diaphragm valves rely on flexible diaphragms to control the on / off state of pipelines. The internal flow channels of the valve body can be adapted to various corrosive and clean fluid transportation conditions such as chemical, water treatment, and pharmaceutical industries. With its excellent sealing performance, it is widely used in industrial fluid pipeline systems.

[0003] In conventional weir-type diaphragm valves, the fluid flow path is only optimized for the arc shape of the middle valve cavity. There is a significant abrupt change in cross-section between the valve body inlet and outlet and the external pipeline. When the medium flows through the inlet and outlet, it is easy to generate eddy currents and turbulence, resulting in excessive pipeline pressure loss and increased fluid transport energy consumption. At the same time, the high-speed eddy currents continuously scour the edge of the diaphragm, and after long-term opening and closing, the diaphragm is prone to erosion and damage, and the sealing stability is greatly reduced. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by setting a smooth and gradually expanding flow guiding area in the inlet section and a smooth and gradually contracting flow guiding area in the outlet section, and by making the inner wall curved surfaces of the inlet section, the middle valve cavity section and the outlet section continuously and smoothly connected, so as to achieve uniform flow and resistance reduction in the entire flow channel and weaken the scouring of the diaphragm by the fluid.

[0005] The technical solution of this utility model is implemented as follows: a low-flow-barrier diaphragm valve includes a valve body, a flow-guiding liner disposed within the valve body, and a flexible diaphragm disposed above the flow-guiding liner. The flow-guiding liner forms a through-flow channel, which is sequentially divided into an inlet section with an inlet straight pipe section, a middle valve cavity section, and an outlet section with an outlet straight pipe section. A sealing weir platform that cooperates with the flexible diaphragm is provided within the middle valve cavity section. The inlet section has a flow channel cross-section that smoothly expands along the fluid flow direction to form a gradually expanding flow guiding region, and the outlet section has a flow channel cross-section that smoothly contracts along the fluid flow direction to form a gradually contracting flow guiding region. The inner wall surfaces of the inlet section, the middle valve chamber section, and the outlet section are continuously and smoothly connected.

[0006] The present invention is further configured such that the initial diameter of the gradually expanding guide region is consistent with the diameter of the inlet straight pipe section of the inlet segment, and the final diameter of the gradually contracting guide region is consistent with the diameter of the outlet straight pipe section.

[0007] The present invention is further configured such that the top of the sealing weir platform is an arc-shaped sealing surface, and the two sides of the sealing weir platform are gentle slope guiding surfaces, and the gentle slope guiding surfaces are smoothly connected to the inner wall of the middle valve cavity section.

[0008] The present invention is further configured such that the lower surface of the flexible diaphragm is provided with a conforming curved surface that matches the sealing weir platform, and when the valve is closed, the conforming curved surface is tightly pressed against the arc sealing surface.

[0009] The present invention is further configured such that the flow-guiding liner is made of fluororesin.

[0010] The present invention is further configured such that the inner wall of the fluid channel is entirely a continuous arc surface, and there are no right-angle steps or bends at the joints of the curved surfaces.

[0011] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. By smoothly expanding the inlet section, smoothly contracting the outlet section, and continuously and smoothly connecting the inner wall curved surface, eddies and flow resistance are reduced, thus improving fluid transport efficiency.

[0012] 2. By using the arc-shaped sealing surface and the gently sloping guiding surface of the sealing weir platform to fit the curved surface of the diaphragm, impact is reduced and sealing is ensured, thus improving the reliability of the seal.

[0013] 3. By designing the entire inner wall of the flow channel as a continuous arc surface without right-angle steps, dead zones in the flow are eliminated, improving cleanliness and residue prevention performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the flow direction of the medium in the fluid channel; Figure 4 yes Figure 2 A magnified structural diagram of part A.

[0015] The attached figures are labeled as follows: 1. Valve body; 2. Flow guide liner; 3. Flexible diaphragm; 31. Fitting curved surface; 4. Fluid flow channel; 41. Inlet section; 411. Inlet straight pipe section; 412. Gradually expanding flow guide area; 42. Middle valve cavity section; 43. Outlet section; 431. Outlet straight pipe section; 432. Gradually contracting flow guide area; 5. Sealing weir; 51. Circular arc sealing surface; 52. Gentle slope flow guide surface. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 : Example: This embodiment provides a low-flow-barrier diaphragm valve, including a valve body 1, a flow-guiding liner 2 disposed within the valve body 1, and a flexible diaphragm 3 disposed above the flow-guiding liner 2. The flow-guiding liner 2 forms a through-flow channel 4, which is sequentially divided into an inlet section 41 with an inlet straight pipe section 411, a middle valve cavity section 42, and an outlet section 43 with an outlet straight pipe section 431. The middle valve cavity section 42 is provided with a sealing weir 5 that cooperates with the flexible diaphragm 3. The flow channel cross section of the inlet section 41 smoothly expands along the fluid flow direction to form a gradually expanding flow guiding region 412, and the flow channel cross section of the outlet section 43 smoothly contracts along the fluid flow direction to form a gradually contracting flow guiding region 432. The inner wall surfaces of the inlet section 41, the middle valve chamber section 42, and the outlet section 43 are continuously and smoothly connected.

[0017] This embodiment relates to a low-flow-barrier diaphragm valve, which is assembled from a valve body 1, a flow guide liner 2, a flexible diaphragm 3, and a drive assembly. The valve body 1 serves as an external load-bearing component to provide installation support for the other components. The flow guide liner 2 is embedded inside the valve body 1 to form a fluid flow channel. The flexible diaphragm 3 is disposed above the flow guide liner 2 as a sealing actuator. The drive assembly is assembled on the top of the valve body 1 and connected to the flexible diaphragm 3 to drive the flexible diaphragm 3 to deform in order to achieve valve opening and closing control.

[0018] The valve body 1 is a hollow shell structure with connecting ends for connecting to external pipelines at both axial ends. The connecting ends at both ends have through fluid inlets and outlets. The valve body 1 has an installation cavity that communicates with the fluid inlets and outlets at both ends. The top of the valve body 1 has a vertically through assembly opening. The edge of the assembly opening has a ring-shaped support step. The edge of the flexible diaphragm 3 is placed on the support step. The top of the valve body 1 can be fitted with a valve cover. After the valve cover is pressed down, the edge of the flexible diaphragm 3 is clamped and fixed between the support step and the end face of the valve cover, thereby achieving the positioning and static sealing of the edge of the flexible diaphragm 3.

[0019] The flow guide liner 2 is a one-piece molded cylindrical liner structure. Its outer wall fits against the inner wall of the cavity installed in the valve body 1. The interior of the flow guide liner 2 forms a fluid flow channel 4 that runs through the valve body 1 along the axial direction. The fluid flow channel 4 is divided into an inlet section 41, a middle valve cavity section 42, and an outlet section 43 along the fluid flow direction. The inlet section 41 includes an inlet straight pipe section 411 and a gradually expanding flow guide area 412. The outlet section 43 includes a gradually contracting flow guide area 432 and an outlet straight pipe section 431. The inlet straight pipe section 411 of the inlet section 41 is aligned with the fluid inlet and outlet at one end of the valve body 1. The outlet straight pipe section 431 of the outlet section 43 is aligned with the fluid inlet and outlet at the other end of the valve body 1, so that the fluid in the external pipeline can directly enter the flow channel of the flow guide liner 2.

[0020] In the inlet section 41, the inlet straight pipe section 411 is located at the upstream end of the flow channel, and its diameter matches that of the external pipe. The gradually expanding guide region 412 is located between the inlet straight pipe section 411 and the middle valve chamber section 42. Along the fluid flow direction, the cross-section of the gradually expanding guide region 412 smoothly expands, and the diameter at the beginning of the gradually expanding guide region 412 is consistent with the diameter of the inlet straight pipe section 411. The end of the gradually expanding guide region 412 smoothly connects with the inlet end of the middle valve chamber section 42. In the outlet section 43, the gradually contracting guide region 432 is located between the middle valve chamber section 42 and the outlet straight pipe section 431. Along the fluid flow direction, the cross-section of the gradually contracting guide region 432 smoothly narrows, and the diameter at the end of the gradually contracting guide region 432 is consistent with the diameter of the outlet straight pipe section 431. The beginning of the gradually contracting guide region 432 smoothly connects with the outlet end of the middle valve chamber section 42. The inner walls of the inlet section 41, the middle valve chamber section 42 and the outlet section 43 are continuous arc surfaces. There are no right-angle steps or bends at the connection points of the various curved surfaces, and the inner wall of the entire fluid flow channel 4 maintains a continuous and smooth transition state.

[0021] The bottom inner wall of the middle valve cavity section 42 is integrally formed with an upwardly protruding sealing weir platform 5. The sealing weir platform 5 extends radially along the flow channel and spans the entire cross-sectional width of the flow channel. The top of the sealing weir platform 5 is an arc sealing surface 51. The two sides of the sealing weir platform 5 facing the inlet section 41 and the outlet section 43 are respectively set as gentle slope guide surfaces 52. The gentle slope guide surfaces 52 on both sides extend gently towards the inlet section 41 and the outlet section 43, and smoothly connect with the inner wall of the middle valve cavity section 42. There are no protruding steps or sharp corners at the connection position.

[0022] The flexible diaphragm 3 is a sheet-like sealing component with elastic deformation capability. Its middle part is connected to the lower end of the lifting rod of the drive assembly. The edge of the flexible diaphragm 3 is clamped and fixed between the support step on the top of the valve body 1 and the valve cover. The lower surface of the flexible diaphragm 3 is provided with a fitting curved surface 31 that matches the shape of the sealing weir platform 5. When the valve is in the closed state, the drive assembly drives the middle part of the flexible diaphragm 3 to deform downward. The fitting curved surface 31 is tightly pressed against the arc sealing surface 51 on the top of the sealing weir platform 5, completely cutting off the flow channels of the inlet section 41 and the outlet section 43, and achieving fluid sealing and cutoff.

[0023] The flow guide liner 2 is made of fluororesin material. Its inner wall surface is smooth, and the frictional resistance between the fluid and the inner wall is small when the fluid flows through it. This can reduce the flow rate loss of the fluid flowing along the wall. At the same time, the material has the characteristics of chemical corrosion resistance and can be adapted to the transportation conditions of various corrosive fluids.

[0024] The drive assembly consists of a lifting rod and an operating component. The lifting rod is vertically inserted into the mounting opening at the top of the valve body 1. The lower end of the lifting rod is connected to the middle of the flexible diaphragm 3, and the upper end of the lifting rod is connected to the operating component. The operating component can drive the lifting rod to move vertically up and down, thereby pulling the middle of the flexible diaphragm 3 to produce elastic deformation in the up and down direction, thus realizing the opening and closing action of the valve.

[0025] When the valve is in the open state, the operating component lifts the middle part of the flexible diaphragm 3 upward through the lifting rod. The flexible diaphragm 3 separates from the sealing weir 5, and the fluid flows in from the inlet at one end of the valve body 1. After passing through the inlet straight pipe section 411 and the gradually expanding guide area 412, it smoothly enters the middle valve cavity section 42. It is evenly distributed and flows smoothly along the gentle slope guide surfaces 52 on both sides of the sealing weir 5. Then the fluid enters the gradually contracting guide area 432 and gently converges. Finally, it flows out of the valve body 1 through the outlet straight pipe section 431. The cross-section of the flow channel changes gently throughout the entire process, and there is no abrupt change in the inner wall structure. The fluid velocity remains uniform and stable, which can reduce the generation of eddies and reduce the pressure loss during fluid transportation. When the valve is closed, the operating component moves the center of the flexible diaphragm 3 downward via the lifting rod, causing the flexible diaphragm 3 to undergo downward elastic deformation until the mating curved surface 31 of the lower surface of the flexible diaphragm 3 is completely pressed against the arc sealing surface 51 of the sealing weir platform 5, completely blocking the flow channel. Because the sealing surface is an arc-shaped surface, the flexible diaphragm 3 experiences uniform force during pressing, ensuring the stability of the seal. Simultaneously, the smooth inner wall of the flow channel reduces the scouring of the edges of the flexible diaphragm 3 by the fluid, extending the service life of the flexible diaphragm 3. The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A low-flow-barrier diaphragm valve, comprising a valve body (1), a flow-guiding liner (2) disposed within the valve body (1), and a flexible diaphragm (3) disposed above the flow-guiding liner (2), wherein a through-flow fluid channel (4) is formed inside the flow-guiding liner (2), the fluid channel (4) being sequentially divided into an inlet section (41) having an inlet straight pipe section (411), a middle valve cavity section (42), and an outlet section (43) having an outlet straight pipe section (431), wherein a sealing weir (5) cooperating with the flexible diaphragm (3) is provided in the middle valve cavity section (42), characterized in that: The flow channel cross section of the inlet section (41) smoothly expands along the fluid flow direction to form a gradually expanding flow guiding region (412), and the flow channel cross section of the outlet section (43) smoothly contracts along the fluid flow direction to form a gradually contracting flow guiding region (432). The inner wall surfaces of the inlet section (41), the middle valve chamber section (42), and the outlet section (43) are continuously and smoothly connected.

2. A low flow resistance membrane valve according to claim 1, characterized in that The starting diameter of the gradually expanding guide region (412) is consistent with the diameter of the inlet straight pipe section (411) of the inlet section (41), and the ending diameter of the gradually contracting guide region (432) is consistent with the diameter of the outlet straight pipe section (431).

3. A low flow resistance membrane valve according to claim 1, characterized in that The top of the sealing weir platform (5) is an arc sealing surface (51), and the two sides of the sealing weir platform (5) are gentle slope guiding surfaces (52). The gentle slope guiding surfaces (52) are smoothly connected to the inner wall of the middle valve cavity section (42).

4. A low flow resistance membrane valve according to claim 3, characterized in that The lower surface of the flexible diaphragm (3) is provided with a fitting curved surface (31) that matches the sealing weir platform (5). When the valve is closed, the fitting curved surface (31) is tightly pressed against the arc sealing surface (51).

5. A low-flow-resistance diaphragm valve according to claim 1, characterized in that, The flow guide liner (2) is made of fluororesin.

6. A low flow resistance diaphragm valve according to claim 1, characterized in that The inner wall of the fluid channel (4) is a continuous arc surface, and there are no right-angle steps or bends at the joints of the curved surfaces.

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