Double butterfly valve with high sealing performance

Abstract

The application discloses a high-sealing double-leaf butterfly valve applied to the butterfly valve field, which effectively reduces abrasion and improves sealing performance by improving existing leaves and valve seats, utilizes the strong wear resistance of a polyurethane elastic leaf surface as a sealing surface of a high-sealing valve seat, effectively reduces the abrasion degree of the sealing surface, utilizes the elasticity of elastic filling pieces and a rubber filling layer to effectively reduce the gap of the sealing surface, simultaneously utilizes the mutual magnetic attraction of a magnetic half ring two and a magnetic half ring one to further effectively reduce the gap of the sealing surface, additionally fills sealing liquid in the high-sealing leaf, and relies on the repulsion of permanent magnets on a sliding plug to extrude the sealing liquid when the high-sealing leaf is closed, so that the high-sealing leaf is further in close contact with the high-sealing valve seat, the sealing performance of the sealing surface in the closed state is effectively improved, the high sealing performance of the sealing surface of the leaf and the valve seat is realized, the abrasion of the sealing surface is effectively reduced, and the leakage of the medium when the leaf is closed is effectively prevented.

Description

Technical Field

[0001] This application relates to the field of butterfly valves, and in particular to a high-sealing double-leaf butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing.

[0003] Butterfly valves are divided into single-leaf and double-leaf types. A single-leaf butterfly valve has a central shaft that drives one blade to rotate 90 degrees. A double-leaf butterfly valve has two shafts, one in the middle and one on each side, that drive two blades to rotate 90 degrees. Double-leaf butterfly valves are better at controlling flow than single-leaf butterfly valves. However, current double-leaf butterfly valves have poor sealing performance. After closing, the wear between the blades and the valve seat causes the gap to widen, which can easily lead to media leakage.

[0004] Therefore, we use this technical solution to address the problem of poor sealing caused by wear in existing double-leaf butterfly valves. Summary of the Invention

[0005] The purpose of this application is to improve the existing double-leaf butterfly valve and provide a high-sealing double-leaf butterfly valve. By improving the existing blades and valve seat, wear is effectively reduced and the sealing performance is improved. The strong wear resistance of the polyurethane elastic blade surface is used as the sealing surface with the high-sealing valve seat, which can effectively reduce the wear of the sealing surface. The elasticity of the elastic filler and the rubber filler layer is also used to effectively reduce the gap of the sealing surface, thereby effectively improving the sealing performance. At the same time, the mutual magnetic attraction between the magnetic half ring 2 and the magnetic half ring 1 is used to further effectively reduce the gap of the sealing surface. In addition, by filling the high-sealing blade with sealing fluid, when the high-sealing blade is closed, the permanent magnet block repulses the sliding plug to squeeze the sealing fluid, thereby allowing the high-sealing blade to make closer contact with the high-sealing valve seat, effectively improving the sealing performance of the sealing surface in the closed state.

[0006] This achieves high sealing performance between the blade and the valve seat sealing surface, effectively reducing wear on the sealing surface and preventing media leakage caused by increased gaps after the blade closes.

[0007] Furthermore, both high-sealing valve seats are fixedly connected to the vane rotating seat, and the diameter of the circular structure formed by the two high-sealing valve seats and the vane rotating seat is equal to the inner diameter of the valve body. The vane rotating seat and the high-sealing valve seat are installed on the valve body as an integral structure, thereby achieving the interception of the medium. The vane rotating seat, the high-sealing valve seat and the valve body are connected together to avoid the generation of gaps, thereby effectively preventing the medium from leaking from the gaps.

[0008] Furthermore, the flexible sealing membrane, the side wall of the rotating groove, the upper and lower ends of the high-sealing valve seat, and the side wall of the high-sealing blade form a sealed space. The flexible sealing membrane is made of a high-polymer composite material. When the high-sealing blade rotates in the rotating groove, there will be gaps. The function of the flexible sealing membrane is to seal the gaps to prevent the medium from leaking out through the gaps. At the same time, in order not to affect the rotation of the high-sealing blade, the flexible sealing membrane is used for sealing.

[0009] Furthermore, the high-sealing valve seat includes a seat body and a polyurethane elastic bushing, and a connecting plate is fixedly connected to the ends of the seat body and the polyurethane elastic bushing. A magnetic half-ring one is fixedly connected to the inner wall of the polyurethane elastic bushing, which is magnetically attracted to the magnetic half-ring two. The polyurethane elastic bushing and the polyurethane elastic blade form a flow-blocking sealing surface. Both have strong wear resistance, so they can effectively reduce wear and prevent the gap from widening. The mutual magnetic attraction between the magnetic half-ring one and the magnetic half-ring two further reduces the gap of the sealing surface, thereby effectively improving the sealing effect of the sealing surface.

[0010] Furthermore, the inner wall of the seat is provided with an arc-shaped groove, and the arc-shaped groove is filled with a rubber filler layer. The elasticity of the rubber filler layer makes the polyurethane elastic bushing and the polyurethane elastic blade surface more closely in contact. In addition, the elasticity of the elastic filler further improves the sealing effect of the sealing surface.

[0011] Optionally, the inner wall of the butterfly plate body is provided with multiple equally spaced sliding cavities, and the two ends of the sliding cavities are respectively connected to the arc-shaped convex groove and the rotating groove. The inner wall of the sliding cavity is sealed and slidably connected with a sliding plug, and the inner wall of the partition is fixedly embedded with a permanent magnet block that repels the sliding plug. The end of the sliding plug near the permanent magnet block is fixedly connected to the inner wall of the sliding cavity with multiple elastic return ropes. The arc-shaped convex groove and the sliding cavity are also filled with sealing fluid. When the high-seal blade is closed, the sliding plug and the permanent magnet block are facing each other. The magnetic repulsion of the permanent magnet block on the sliding plug causes the sliding plug to move towards the arc-shaped convex groove. During the movement of the sliding plug, the sealing fluid is pushed, and the sealing fluid causes the arc-shaped convex groove to expand, thereby allowing the polyurethane elastic blade surface to make closer contact with the polyurethane elastic bushing, effectively improving the high sealing effect of the sealing surface.

[0012] Furthermore, the elastic filler has a mesh structure and is made of polyurethane elastic material. Since the sliding plug needs to be able to expand the arc-shaped groove after pushing the sealing liquid, the elastic filler cannot hinder the movement of the sealing liquid, so the elastic filler adopts a mesh structure.

[0013] Compared to existing technologies, the advantages of this application are:

[0014] (1) This solution improves the sealing performance by improving the existing blades and valve seats. The strong wear resistance of the polyurethane elastic blade surface is used as the sealing surface with the high-sealing valve seat, which can effectively reduce the wear of the sealing surface. The elasticity of the elastic filler and the rubber filler layer is used to effectively reduce the gap of the sealing surface, thereby effectively improving the sealing performance. At the same time, the mutual magnetic attraction between the magnetic half ring 2 and the magnetic half ring 1 is used to further reduce the gap of the sealing surface. In addition, by filling the high-sealing blade with sealing fluid, when the high-sealing blade is closed, the permanent magnet block repulses the sliding plug to squeeze the sealing fluid, thereby allowing the high-sealing blade to make closer contact with the high-sealing valve seat, effectively improving the sealing performance of the sealing surface when closed, achieving high sealing performance between the blade and the valve seat sealing surface, effectively reducing the wear of the sealing surface, and effectively preventing the medium leakage caused by the increase of gap after the blade is closed.

[0015] (2) Both high-sealing valve seats are fixedly connected to the vane rotating seat, and the diameter of the circular structure formed by the two high-sealing valve seats and the vane rotating seat is equal to the inner diameter of the valve body. The vane rotating seat and the high-sealing valve seat are installed on the valve body as an integral structure, thereby achieving the interception of the medium. The vane rotating seat, the high-sealing valve seat and the valve body are connected together to avoid the generation of gaps, thereby effectively preventing the medium from leaking from the gaps.

[0016] (3) The flexible sealing membrane and the side wall of the rotating groove, the upper and lower ends of the high sealing valve seat, and the side wall of the high sealing blade form a closed space. The flexible sealing membrane is made of polymer composite material. When the high sealing blade rotates in the rotating groove, there will be gaps. The function of the flexible sealing membrane is to seal the gaps to prevent the medium from leaking out through the gaps. At the same time, in order not to affect the rotation of the high sealing blade, the flexible sealing membrane is used for sealing.

[0017] (4) The high-sealing valve seat includes a seat body and a polyurethane elastic bushing. The ends of the seat body and the polyurethane elastic bushing are fixedly connected to a connecting plate. The inner wall of the polyurethane elastic bushing is fixedly connected to a magnetic half-ring one that is magnetically attracted to the magnetic half-ring two. The polyurethane elastic bushing and the polyurethane elastic blade form a flow-blocking sealing surface. Both have strong wear resistance, so they can effectively reduce wear and prevent the gap from getting bigger. The mutual magnetic attraction between the magnetic half-ring one and the magnetic half-ring two further reduces the gap of the sealing surface, thereby effectively improving the sealing effect of the sealing surface.

[0018] (5) An arc-shaped groove is provided on the inner wall of the seat, and the arc-shaped groove is filled with a rubber filling layer. The elasticity of the rubber filling layer makes the polyurethane elastic bushing and the polyurethane elastic blade more closely in contact. In addition, the elasticity of the elastic filling component further improves the sealing effect of the sealing surface.

[0019] (6) The inner wall of the butterfly plate body is provided with multiple equally spaced sliding cavities, and the two ends of the sliding cavities are connected to the arc-shaped convex groove and the rotating groove respectively. The inner wall of the sliding cavity is sealed and slidably connected with a sliding plug, and the inner wall of the partition is fixedly embedded with a permanent magnet block that repels the sliding plug. The end of the sliding plug near the permanent magnet block is fixedly connected to the inner wall of the sliding cavity with multiple elastic reset ropes. The arc-shaped convex groove and the sliding cavity are also filled with sealing liquid. When the high-sealing blade is closed, the sliding plug and the permanent magnet block are facing each other. The sliding plug moves towards the arc-shaped convex groove by relying on the magnetic repulsion of the permanent magnet block. During the movement of the sliding plug, the sealing liquid is pushed, and the sealing liquid causes the arc-shaped convex groove to expand, thereby allowing the polyurethane elastic blade surface to further contact the polyurethane elastic bushing, effectively improving the high sealing effect of the sealing surface.

[0020] (7) The elastic filler is a mesh structure and the elastic filler is made of polyurethane elastic material. Since the sliding plug needs to be able to expand the arc-shaped groove after pushing the sealing liquid, the elastic filler cannot hinder the movement of the sealing liquid. Therefore, the elastic filler adopts a mesh structure. Attached Figure Description

[0021] Figure 1 This is a perspective view of the application when closed;

[0022] Figure 2 This is a perspective view of the application when it is opened;

[0023] Figure 3 This is a diagram showing the state of the high-sealing blade of this application when it is open;

[0024] Figure 4 This is a diagram showing the state of the high-sealing blade in this application when it is closed;

[0025] Figure 5 This is a perspective view of the high-sealing valve seat and high-sealing blade of this application;

[0026] Figure 6 This is a front sectional view of the high-sealing blade of this application;

[0027] Figure 7 This is a front sectional view of the high-sealing valve seat of this application;

[0028] Figure 8 This is a schematic diagram showing the opening direction of the high-sealing blade in this application;

[0029] Figure 9 This is a perspective view of the blade rotating seat of this application.

[0030] Explanation of the labels in the diagram:

[0031] 1 Valve body, 2 Blade rotating seat, 201 Rotating groove, 202 Baffle, 3 High-sealing valve seat, 301 Seat body, 302 Polyurethane elastic bushing, 303 Connecting plate, 304 Magnetic half ring one, 305 Rubber filling layer, 4 High-sealing blade, 401 Butterfly plate body, 402 Polyurethane elastic blade surface, 403 Magnetic half ring two, 404 Elastic filling part, 405 Slide cavity, 406 Slide plug, 407 Elastic reset rope, 5 Valve stem, 6 Permanent magnet block. Detailed Implementation

[0032] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0033] Example 1:

[0034] A high-sealing double-leaf butterfly valve, please refer to Figure 1 , 2 5 and Figure 7 The valve includes a butterfly valve body 1, with a vane rotating seat 2 fixedly connected to the centerline of the valve body 1. High-sealing valve seats 3 are fixedly connected to the inner walls of both sides of the valve body 1, located on the vane rotating seat 2. Each high-sealing valve seat 3 includes a seat 301 and a polyurethane elastic bushing 302. A connecting plate 303 is fixedly connected to the ends of the seat 301 and the polyurethane elastic bushing 302. A magnetic half-ring 304, which magnetically attracts the magnetic half-ring 403, is fixedly connected to the inner wall of the polyurethane elastic bushing 302. The polyurethane elastic bushing 302 and the polyurethane elastic vane 402 form a flow-blocking seal. Both surfaces have strong wear resistance, thus effectively reducing wear and preventing gaps from widening. The mutual magnetic attraction between magnetic half-ring 304 and magnetic half-ring 403 further reduces the gaps on the sealing surface, thereby effectively improving the sealing effect. The inner wall of the seat 301 has an arc-shaped groove, and the arc-shaped groove is filled with a rubber filling layer 305. The elasticity of the rubber filling layer 305 makes the polyurethane elastic bushing 302 and the polyurethane elastic blade 402 more closely contacted. In addition, the elasticity of the elastic filler 404 further improves the sealing effect of the sealing surface.

[0035] Please see Figure 3 , 4 and Figure 9Both high-sealing valve seats 3 are fixedly connected to the vane rotating seat 2, and the diameter of the circular structure formed by the two high-sealing valve seats 3 and the vane rotating seat 2 is equal to the inner diameter of the valve body 1. The vane rotating seat 2 and the high-sealing valve seat 3 are installed on the valve body 1 as an integral structure, thereby achieving the interception of the medium. The vane rotating seat 2, the high-sealing valve seat 3 and the valve body 1 are connected together to avoid the generation of gaps, thereby effectively preventing the medium from leaking from the gaps. Rotary grooves 201 are opened on both sides of the vane rotating seat 2, and a partition plate 202 is spaced between the two rotating grooves 201.

[0036] Please see Figure 3 , 4 Two rotating grooves 201 are each rotatably connected to a high-sealing blade 4 that matches the high-sealing valve seat 3. The contact surfaces of the high-sealing blade 4 and the high-sealing valve seat 3 are magnetically attracted to each other. A flexible sealing membrane is fixedly connected between the side wall of the high-sealing blade 4 inside the rotating groove 201 and the rotating groove 201 and the high-sealing valve seat 3. The flexible sealing membrane, the side wall of the rotating groove 201, the upper and lower ends of the high-sealing valve seat 3, and the side wall of the high-sealing blade 4 form a sealed space. The flexible sealing membrane is made of a high-polymer composite material (preferably composite rubber material, but other materials can be selected according to actual needs). When the high-sealing blade 4 rotates in the rotating groove 201, there will be gaps. The function of the flexible sealing membrane is to seal the gaps to prevent the medium from leaking out through the gaps. At the same time, in order not to affect the rotation of the high-sealing blade 4, a flexible sealing membrane is used for sealing.

[0037] Please see Figure 5 , 6 The butterfly valve body includes two valve stems 5, which pass through the rotating groove 201 and are fixedly connected to the upper end of the high-sealing blade 4. The high-sealing blade 4 includes a butterfly plate body 401. The butterfly plate body 401 has an arc-shaped groove on its side wall near the high-sealing valve seat 3. A polyurethane elastic blade 402 is fixedly connected to the opening of the arc-shaped groove. A magnetic half-ring 403 is fixedly connected to the inner wall of the polyurethane elastic blade 402. An elastic filler 404 is filled between the magnetic half-ring 403 and the groove wall of the arc-shaped groove.

[0038] Example 2:

[0039] Based on Example 1, please refer to Figure 6 , 8The inner wall of the butterfly plate body 401 has multiple equally spaced sliding cavities 405, and the two ends of the sliding cavities 405 are connected to the arc-shaped protrusion and the rotating groove 201 respectively. The inner wall of the sliding cavity 405 is slidably connected with a sliding plug 406, and the inner wall of the partition plate 202 is fixedly embedded with a permanent magnet 6 that repels the sliding plug 406. The end of the sliding plug 406 near the permanent magnet 6 is fixedly connected to the inner wall of the sliding cavity 405 with multiple elastic return ropes 407. The arc-shaped protrusion and the sliding cavity 405 are also filled with sealing fluid. When the high-seal blade 4 is closed, the sliding plug 406 and the permanent magnet 6 are directly opposite each other, and the permanent magnet 6 controls the sliding plug 406. The magnetic repulsion of 6 causes the slider 406 to move towards the arc-shaped groove. During the movement of the slider 406, it pushes the sealing fluid, which in turn causes the arc-shaped groove to expand. This allows the polyurethane elastic blade 402 to come into closer contact with the polyurethane elastic bushing 302, effectively improving the high sealing effect of the sealing surface. The elastic filler 404 has a mesh structure and is made of polyurethane elastic material. Since the slider 406 needs to be able to expand the arc-shaped groove after pushing the sealing fluid, the elastic filler 404 cannot hinder the movement of the sealing fluid. Therefore, the elastic filler 404 adopts a mesh structure.

[0040] The working principle of this scheme is as follows: the opening direction of the two high-sealing blades 4 is opposite to the direction of medium flow, which can effectively control the flow rate. When the two high-sealing blades 4 are closed, the polyurethane elastic bushing 302 and the polyurethane elastic blade surface 402 form a sealing surface. Both have strong wear resistance, thus effectively reducing wear and preventing gaps from widening. The mutual magnetic attraction between the magnetic half-ring 304 and the magnetic half-ring 403 further reduces the gaps in the sealing surface, thereby effectively improving the sealing effect of the sealing surface. The elasticity of the rubber filling layer 305 and the elasticity of the elastic filler 404 are also factors. This allows for a tighter contact between the polyurethane elastic bushing 302 and the polyurethane elastic blade 402, thereby further improving the sealing effect of the sealing surface. When the high-sealing blade 4 is closed, the sliding plug 406 is directly opposite the permanent magnet 6. Relying on the magnetic repulsion of the permanent magnet 6 on the sliding plug 406, the sliding plug 406 moves towards the arc-shaped groove. During the movement of the sliding plug 406, the sealing fluid is pushed, and the sealing fluid causes the arc-shaped groove to expand, thereby allowing the polyurethane elastic blade 402 to further contact the polyurethane elastic bushing 302, effectively improving the high-sealing effect of the sealing surface.

[0041] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A high-sealing double-leaf butterfly valve, comprising a butterfly valve body, wherein the butterfly valve body includes a valve body (1), characterized in that, A blade rotating seat (2) is fixedly connected to the centerline of the valve body (1), and high-sealing valve seats (3) are fixedly connected to both inner walls of the valve body (1) on both sides of the blade rotating seat (2). Rotating grooves (201) are opened on both side walls of the blade rotating seat (2), and a partition (202) is spaced between the two rotating grooves (201). High-sealing blades (4) that match the high-sealing valve seats (3) are rotatably connected in both rotating grooves (201), and the contact surfaces of the high-sealing blades (4) and the high-sealing valve seats (3) are magnetically attracted to each other. The side wall of the high-sealing blades (4) inside the rotating grooves (201) is connected to the rotating grooves (201) and the high-sealing valve seats (3). A flexible sealing membrane is fixedly connected between the seats (3). The butterfly valve body includes two valve stems (5), and the two valve stems (5) pass through the rotating groove (201) and are fixedly connected to the upper end of the high sealing blade (4). The high sealing blade (4) includes a butterfly plate body (401). The butterfly plate body (401) has an arc-shaped groove on the side wall near the high sealing valve seat (3), and a polyurethane elastic blade (402) is fixedly connected at the opening of the arc-shaped groove. A magnetic half ring (403) is fixedly connected to the inner wall of the polyurethane elastic blade (402), and an elastic filler (404) is filled between the magnetic half ring (403) and the groove wall of the arc-shaped groove. The inner wall of the butterfly plate body (401) is provided with a plurality of equally spaced sliding cavities (405), and the two ends of the sliding cavities (405) are respectively connected to the arc-shaped convex groove and the rotating groove (201). The inner wall of the sliding cavity (405) is sealed and slidably connected with a sliding plug (406), and the inner wall of the partition (202) is fixedly embedded with a permanent magnet block (6) that repels the sliding plug (406). The end of the sliding plug (406) near the permanent magnet block (6) is fixedly connected to the inner wall of the sliding cavity (405) with a plurality of elastic reset ropes (407). The arc-shaped convex groove and the sliding cavity (405) are also filled with sealing liquid.

2. The high-sealing double-leaf butterfly valve according to claim 1, characterized in that, Both of the high-sealing valve seats (3) are fixedly connected to the blade rotating seat (2), and the diameter of the circular structure formed by the two high-sealing valve seats (3) and the blade rotating seat (2) is equal to the inner diameter of the valve body (1).

3. The high-sealing double-leaf butterfly valve according to claim 1, characterized in that, The flexible sealing membrane and the side wall of the rotating groove (201), the upper and lower ends of the high sealing valve seat (3), and the side wall of the high sealing blade (4) form a closed space, and the flexible sealing membrane is made of polymer composite material.

4. A high-sealing double-leaf butterfly valve according to claim 1, characterized in that, The high-sealing valve seat (3) includes a seat body (301) and a polyurethane elastic bushing (302), and a connecting plate (303) is fixedly connected to the ends of the seat body (301) and the polyurethane elastic bushing (302). A magnetic half ring (304) that magnetically attracts the magnetic half ring (403) is fixedly connected to the inner wall of the polyurethane elastic bushing (302).

5. A high-sealing double-leaf butterfly valve according to claim 4, characterized in that, The inner wall of the seat (301) is provided with an arc-shaped groove, and the arc-shaped groove is filled with a rubber filling layer (305).

6. A high-sealing double-leaf butterfly valve according to claim 1, characterized in that, The elastic filler (404) has a mesh structure and is made of polyurethane elastic material.

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