Butterfly valve with elastic compensation seal

Abstract

This utility model discloses a butterfly valve with an elastic compensation sealing structure, comprising a butterfly plate rotatably mounted within a valve body. The butterfly plate has a first arc surface with a wear-resistant layer. A pressure ring is fixed to the valve body, and a valve seat movable along the axial direction of the valve body is provided between the pressure ring and the valve body. A spring is provided between the valve seat and the pressure ring, and the valve seat has a sealing arc surface that mates with the wear-resistant layer. Compared with the prior art, in this utility model, the movable valve seat, under the action of the spring, can still maintain a tight fit with the wear-resistant layer under high temperature and pressure, achieving bidirectional sealing. Furthermore, the wear-resistant layer on the butterfly plate and the sealing arc surface on the valve seat are machined into partially spherical surfaces, forming surface contact rather than line contact when the valve is closed. This structural design can disperse sealing stress, reduce wear, and improve service life.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve manufacturing technology, and in particular to a butterfly valve with an elastic compensation sealing structure. Background Technology

[0002] Currently, most butterfly valves are triple-eccentric butterfly valves and center-line soft-seal butterfly valves. The sealing gasket of the center-line soft-seal butterfly valve is made of rubber / PTFE, which is only suitable for temperatures below 120℃ and has poor temperature resistance. The triple-eccentric butterfly valve uses multi-layer sealing gaskets and can be used for temperatures below 400℃, but it is easily eroded and has a short service life. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] Based on this, this utility model proposes a butterfly valve with an elastic compensation sealing structure to solve the problems of low operating temperature and short service life of existing butterfly valves.

[0005] (II) Technical Solution

[0006] To overcome or at least partially solve the above problems, this utility model provides a butterfly valve with an elastic compensation sealing structure, including a butterfly plate rotatably disposed in the valve body, the butterfly plate having a first arc surface, the first arc surface having a wear-resistant layer, a pressure ring fixed on the valve body, a valve seat capable of moving along the axial direction of the valve body between the pressure ring and the valve body, a spring between the valve seat and the pressure ring, and a sealing arc surface on the valve seat that cooperates with the wear-resistant layer.

[0007] Preferably, the butterfly plate is provided with a second arc surface, the first arc surface is located above the second arc surface, and the length of the second arc surface is greater than the length of the first arc surface.

[0008] Preferably, a sealing ring is provided between the valve seat and the valve body.

[0009] Preferably, the sealing ring is disposed in the mounting groove of the valve seat.

[0010] Preferably, the valve seat has a protrusion facing the butterfly plate, and the valve seat has a sealing block located between the wear-resistant layer and the protrusion, and the sealing arc surface is provided on the sealing block.

[0011] Preferably, one end of the spring is located within the limiting groove of the pressure ring.

[0012] Preferably, the pressure ring is fixed to the valve body by screws.

[0013] Preferably, the end face of the pressure ring away from the valve seat is flush with the end face of the valve body.

[0014] Preferably, the wear-resistant layer is made of tungsten carbide or nickel-based alloy powder.

[0015] Preferably, the butterfly plate is fixed on the valve stem, the valve stem is connected to the valve body through a bearing, one end of the valve stem is in contact with the pressure plate on the valve body, and the other end is connected to the drive mechanism. A thrust washer and a pressure cap are provided at the valve stem, and graphite is filled between the thrust washer and the pressure cap. The thrust washer and the pressure cap are located between the bearing and the drive mechanism.

[0016] (III) Beneficial Effects

[0017] The butterfly valve with the elastic compensation sealing structure of this utility model has the following advantages:

[0018] In this invention, the movable valve seat, under the action of the spring, can still maintain a tight fit with the wear-resistant layer under high temperature and pressure, achieving bidirectional sealing (able to withstand both forward and reverse pressure). Secondly, the wear-resistant layer on the butterfly plate and the sealing arc surface on the valve seat are machined into partial spherical surfaces, so that when the valve is closed, the two form surface contact rather than line contact. This structural design can disperse sealing stress, reduce wear, and improve service life. Attached Figure Description

[0019] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A;

[0022] Figure 3 This is a schematic diagram of the structure of the butterfly plate of this utility model;

[0023] Figure 4 This is a schematic diagram of the valve body of this utility model;

[0024] Figure 5 This is a physical image of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Valve body, 2. Butterfly plate, 3. Pressure ring, 4. Valve seat, 5. Spring, 6. Sealing ring, 7. Screw, 8. Valve stem, 9. Bearing, 01. Pressure plate, 02. Drive mechanism, 03. Thrust washer, 04. Pressure cap, 05. Graphite, 06. First center line, 07. Second center line, 11. Protrusion, 21. First arc surface, 22. Wear-resistant layer, 23. Second arc surface, 31. Limiting groove, 41. Sealing block, 100. Sealing arc surface. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] See attached document Figure 1 This embodiment provides a butterfly valve with an elastically compensated sealing structure, including a butterfly plate 2 rotatably disposed within the valve body 1, as shown in the attached figure. Figure 2 The butterfly plate 2 has a first arc surface 21, on which a wear-resistant layer 22 is fixed. A pressure ring 3 is fixed on the valve body 1. A valve seat 4, which can move along the axial direction of the valve body 1, is provided between the pressure ring 3 and the valve body 1. A spring 5 is provided between the valve seat 4 and the pressure ring 3. The valve seat 4 has a sealing arc surface 100 that cooperates with the wear-resistant layer 22. In this invention, the wear-resistant layer 22 on the butterfly plate 2 and the sealing arc surface 100 on the valve seat 4 are machined into partial spherical surfaces. When the butterfly valve is closed, the two form surface contact rather than line contact. This design can disperse sealing stress, reduce wear, and improve service life. Secondly, the movable valve body 1, in conjunction with the spring 5, makes the butterfly plate 2 and the valve seat 4 in flexible contact when the valve is closed. After the valve is closed, the sealing arc surface 100 can tightly fit the wear-resistant layer 22 under the action of the spring 5, ensuring reliable sealing. The butterfly valve provided by this invention has uniform wear during opening and closing, a long maintenance cycle, and is especially suitable for frequent opening and closing applications. This butterfly valve is suitable for harsh working conditions, specifically, it has a wide operating pressure range (PN10~PN100).

[0029] In another embodiment of this utility model: the butterfly plate 2 is provided with a second arc surface 23, and a first arc surface 21 is provided above the second arc surface 23. The length of the second arc surface 23 is greater than the length of the first arc surface 21, and the first arc surface 21 is provided at the end of the butterfly plate 2 with a larger diameter. The first arc surface 21 protrudes from the second arc surface 23. Through this structural design, when the butterfly plate 2 rotates, the sealing arc surface 100 can reduce the friction area with the butterfly plate 2, thereby reducing wear between the two and improving service life.

[0030] In another embodiment of this utility model, a sealing ring 6 is provided between the valve seat 4 and the valve body 1. The sealing ring 6 is used to seal the gap between the valve seat 4 and the valve body 1. Specifically, the sealing ring 6 is a commonly used metal hard sealing material that is resistant to high temperature and high pressure.

[0031] One installation method for the sealing ring 6: The sealing ring 6 is installed in the mounting groove of the valve seat 4.

[0032] As another embodiment of the present invention: the valve seat 4 is provided with a protrusion 11 facing the butterfly plate 2, the valve seat 4 is provided with a sealing block 41 located between the wear-resistant layer 22 and the protrusion 11, the surface of the sealing block 41 in contact with the protrusion 11 is a sliding surface, and the sealing arc surface 100 is provided on the sealing block 41.

[0033] One installation method of spring 5: one end of spring 5 is located in the limiting groove 31 of pressure ring 3, and multiple springs 5 ​​are evenly distributed on the outer periphery of pressure ring 3.

[0034] One embodiment of fixing the pressure ring 3 to the valve body 1: The pressure ring 3 is fixed to the valve body 1 by screws 7, and the pressure ring 3 is provided with countersunk holes that are compatible with the screws 7.

[0035] In another embodiment of this utility model, the end face of the pressure ring 3 away from the valve seat 4 is flush with the end face of the valve body 1.

[0036] In another embodiment of this invention, the wear-resistant layer 22 is made of tungsten carbide or nickel-based alloy powder, and is obtained by high-temperature spraying. This method increases the hardness of the contact surface and improves service life. Specifically, its operating temperature can reach over 600℃.

[0037] As another embodiment of this utility model: refer to the appendix Figure 1 The butterfly plate 2 is fixed to the valve stem 8. Specifically, the butterfly plate 2 is fixed with two support plates, and the valve stem 8 is fixed inside the support plates. (See attached diagram.) Figure 3 and attached Figure 4 The first centerline 06 of the valve stem 8 is not located on the second centerline 07 of the valve body 1, meaning the valve stem 8 is eccentrically designed. The valve stem 8 is connected to the valve body 1 via a bearing 9. One end of the valve stem 8 is in contact with the pressure plate 01 on the valve body 1, and the other end is connected to the drive mechanism 02. A thrust washer 03 and a pressure cap 04 are provided at the valve stem 8, with graphite 05 filling the space between the thrust washer 03 and the pressure cap 04. The thrust washer 03 and the pressure cap 04 are located between the bearing 9 and the drive mechanism 02. The drive mechanism 02 drives the valve stem 8 to rotate, thereby rotating the butterfly plate 2 to complete the opening and closing of the butterfly valve. The eccentric design reduces friction (reduces torque), making opening and closing easier, allowing the butterfly valve to be paired with a small drive mechanism 02.

[0038] Finally, the method of this utility model is only a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

[0039] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A butterfly valve with an elastically compensated sealing structure, characterized in that, The valve body includes a butterfly plate rotatably mounted inside the valve body. The butterfly plate has a first arc surface with a wear-resistant layer. A pressure ring is fixed on the valve body. A valve seat that can move along the axial direction of the valve body is provided between the pressure ring and the valve body. A spring is provided between the valve seat and the pressure ring. The valve seat has a sealing arc surface that cooperates with the wear-resistant layer.

2. The butterfly valve with an elastic compensation sealing structure according to claim 1, characterized in that, The butterfly plate is provided with a second arc surface, and the first arc surface is located above the second arc surface. The length of the second arc surface is greater than the length of the first arc surface.

3. The butterfly valve with an elastic compensation sealing structure according to claim 2, characterized in that, A sealing ring is provided between the valve seat and the valve body.

4. The butterfly valve with an elastic compensation sealing structure according to claim 3, characterized in that, The sealing ring is located in the mounting groove of the valve seat.

5. The butterfly valve with an elastic compensation sealing structure according to claim 4, characterized in that, The valve seat is provided with a protrusion facing the butterfly plate, and the valve seat is provided with a sealing block located between the wear-resistant layer and the protrusion, and the sealing arc surface is provided on the sealing block.

6. The butterfly valve with an elastic compensation sealing structure according to claim 5, characterized in that, One end of the spring is located in the limiting groove of the pressure ring.

7. The butterfly valve with an elastic compensation sealing structure according to claim 6, characterized in that, The pressure ring is fixed to the valve body by screws.

8. The butterfly valve with an elastic compensation sealing structure according to claim 7, characterized in that, The end face of the pressure ring furthest from the valve seat is flush with the end face of the valve body.

9. The butterfly valve with an elastic compensation sealing structure according to claim 8, characterized in that, The wear-resistant layer is made of tungsten carbide or nickel-based alloy powder.

10. The butterfly valve with an elastically compensated sealing structure according to claim 9, characterized in that, The butterfly plate is fixed on the valve stem, which is connected to the valve body via a bearing. One end of the valve stem is in contact with the pressure plate on the valve body, and the other end is connected to the drive mechanism. A thrust washer and a pressure cap are provided at the valve stem. Graphite is filled between the thrust washer and the pressure cap. The thrust washer and the pressure cap are located between the bearing and the drive mechanism.

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