Novel sealing ring of butterfly valve

Abstract

The utility model provides a novel sealing ring of a butterfly valve, and belongs to the technical field of machinery. The butterfly valve solves the problems that a sealing ring of an existing butterfly valve is large in opening and closing resistance and poor in sealing effect. The novel sealing ring of the butterfly valve comprises an annular body, the inner side wall of the body comprises installation faces located at the upper end and the lower end and arranged in parallel and a sealing face connected with the two installation faces, through installation holes are formed in the two installation faces, and the sealing face is an arc-shaped face with the middle protruding. Two arc-shaped elastic rings are arranged in the middle of the body, the elastic rings and the body are coaxially arranged, the two elastic rings are symmetrically arranged on the two sides of the mounting hole, and the body wraps the elastic rings. The novel sealing ring of the butterfly valve has the advantages that the opening and closing resistance of the valve plate is small, the sealing effect is good, and the service life is long.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a sealing ring, in particular to a new sealing ring for a butterfly valve. Background Technique

[0002] A butterfly valve, also called a flap valve, is a simple-structured regulating valve. A butterfly valve that can be used for the on-off control of a low-pressure pipeline medium refers to a valve whose closing member (valve flap or butterfly plate) is a disc and rotates around the valve shaft to achieve opening and closing. It mainly functions as a cut-off and throttling in a pipeline. The opening and closing member of a butterfly valve is a disc-shaped butterfly plate that rotates around its own axis inside the valve body to achieve opening, closing, or regulation.

[0003] During the use of the sealing ring of a butterfly valve, it is prone to sliding. At the same time, since the sealing ring fits tightly on the shaft rod, the shaft rod will cause wear to the connection part between it and the sealing ring during rotation. Over time, it will cause the medium to leak from the part where the sealing ring is connected to the shaft rod, resulting in production accidents. At the same time, the existing sealing rings are difficult to disassemble.

[0004] For example, a sealing ring of a metal butterfly valve disclosed in Chinese patent literature (application number: 202121471219.1) includes a butterfly valve body and a sealing ring body. The sealing ring body is installed inside the butterfly valve body. Wear-resistant shaft sleeves are fixedly connected to the bottom and top of the sealing ring body. A raised ring is fixedly connected to the middle of the inner circumferential surface of the sealing ring body, and a sealing side ring is fixedly connected to the outer side surface of the sealing ring body. However, this sealing ring makes the opening and closing resistance of the valve plate large and the sealing effect is not good. Summary of the Invention

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose a new sealing ring for a butterfly valve that has a small opening and closing resistance of the valve plate, a good sealing effect, and a long service life.

[0006] The purpose of the present utility model can be achieved by the following technical solutions: A new sealing ring for a butterfly valve includes an annular body. The inner side wall of the body includes mounting surfaces arranged in parallel at the upper and lower ends and a sealing surface connecting the two mounting surfaces. Through mounting holes are provided on both of the mounting surfaces. It is characterized in that the sealing surface is a convex arc surface in the middle. Two elastic rings are provided in the middle of the body, and the elastic rings are arc-shaped and coaxially arranged with the body. The two elastic rings are symmetrically arranged on both sides of the mounting holes, and the body wraps the elastic rings.

[0007] This sealing ring is installed inside the valve body of a butterfly valve. The rod of the valve plate passes through the mounting hole and the valve plate is installed inside. During use, the edge of the valve plate abuts against the sealing surface to form a seal. Since the middle part of the sealing surface is a convex arc surface, the opening and closing resistance of the valve plate is small, and the compression deformation of the body is small, resulting in good sealing performance of the butterfly valve. Since there are two elastic rings in the middle of the body, the elastic rings are arc-shaped and arranged coaxially with the body, and the two elastic rings are symmetrically arranged on both sides of the mounting hole, and the body wraps the elastic rings, which improves the strength of this sealing ring, as well as the sealing effect and service life.

[0008] In the above-mentioned new sealing ring of a butterfly valve, the cross-section of the elastic ring is U-shaped and the notch of the elastic ring faces horizontally towards the axis of the body. With the above structure of the elastic ring, it has good elastic effect, thus improving the sealing effect.

[0009] In the above-mentioned new sealing ring of a butterfly valve, the upper and lower ends of the elastic ring are stress-bearing parts and the outer side walls of the stress-bearing parts are convex arc surfaces in the middle. With the above-mentioned stress-bearing parts of the elastic ring, stress concentration is avoided and the stress-bearing effect is improved.

[0010] In the above-mentioned new sealing ring of a butterfly valve, a relief groove is annularly provided on the outer side wall of the body, the number of the relief grooves is 2 - 4, and the relief grooves are arranged coaxially with the body. Since a relief groove is annularly provided on the outer side wall of the body, the body has good flexibility. During installation, a good seal can be formed between the outer side wall of the body and the inner side wall of the valve body, improving the service life.

[0011] In the above-mentioned new sealing ring of a butterfly valve, the number of the relief grooves is 2 and the two relief grooves are symmetrically arranged on both sides of the mounting hole. With the above arrangement, the flexibility effect of the body is improved, the deformation of the body is uniform during the installation of this sealing ring, and the service life is improved.

[0012] In the above-mentioned new sealing ring of a butterfly valve, the cross-section of the relief groove is arc-shaped. The cross-section of the relief groove being arc-shaped avoids stress concentration and improves the service life.

[0013] In the above-mentioned new sealing ring of a butterfly valve, the body is made of ethylene propylene diene monomer (EPDM) material. With the above arrangement, this sealing ring has good elastic effect, is safe and environmentally friendly, has good antioxidant performance and high aging resistance, improving the service life.

[0014] In the above-mentioned new sealing ring of a butterfly valve, the mounting hole is a stepped hole. The mounting hole being a stepped hole has the advantages of convenient installation of the valve plate and good connection effect.

[0015] In the above-mentioned new sealing ring of a butterfly valve, the body and the elastic ring are of a vulcanized integral molding structure.

[0016] Compared with the prior art, the novel sealing ring of a butterfly valve has the following advantages:

[0017] 1. The edge of the valve plate abuts against the sealing surface to form a seal. Since the middle part of the sealing surface is a convex arc surface, the opening and closing resistance of the valve plate is small, and the compression deformation of the body is small, so that the sealing performance of the butterfly valve is good;

[0018] 2. Since two elastic rings are wrapped in the middle of the body, the strength of the sealing ring is improved through the elastic rings, and the sealing effect and service life are improved;

[0019] 3. The cross-section of the elastic ring is U-shaped and the notch of the elastic ring faces the axis of the body horizontally, and it has good elastic effect, thus improving the sealing effect;

[0020] 4. Since a relief groove is provided around the outer side wall of the body, the body has good flexibility. During installation, a good seal can be formed between the outer side wall of the body and the inner side wall of the valve body, improving the service life. Description of the Drawings

[0021] Figure 1 is a perspective schematic view of the novel sealing ring of a butterfly valve of the present invention.

[0022] Figure 2 is a front view schematic view of the novel sealing ring of a butterfly valve of the present invention.

[0023] Figure 3 is Figure 2 the A-A cross-sectional schematic view of

[0024] Figure 4 is Figure 2 the B-B cross-sectional schematic view of

[0025] Figure 5 is a perspective schematic view of the elastic ring of the novel sealing ring of a butterfly valve of the present invention.

[0026] In the figure, 1. body; 2. elastic ring; 2a. stress part; 3. mounting surface; 4. sealing surface; 5. mounting hole; 6. relief groove. Detailed Embodiments

[0027] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0028] Such as Figures 1 to 5As shown in the figure, a new sealing ring for a butterfly valve includes an annular body 1. The inner side wall of the body 1 includes mounting surfaces 3 arranged in parallel at the upper and lower ends and a sealing surface 4 connecting the two mounting surfaces 3. The sealing surface 4 is an arc-shaped surface protruding in the middle. Through holes 5 are provided on both mounting surfaces 3. The through holes 5 are stepped holes, which have the advantages of convenient installation of the valve plate and good connection effect. Two elastic rings 2 are provided in the middle of the body 1. The elastic rings 2 are arc-shaped and arranged coaxially with the body 1. The two elastic rings 2 are symmetrically arranged on both sides of the through hole 5, and the body 1 wraps the elastic rings 2. The cross-section of the elastic ring 2 is U-shaped, and the notch of the elastic ring 2 faces the axis of the body 1 horizontally, which has good elastic effect, thus improving the sealing effect. The upper and lower ends of the elastic ring 2 are stress-bearing parts 2a, and the outer side wall of the stress-bearing part 2a is an arc-shaped surface protruding in the middle, avoiding stress concentration and improving the stress-bearing effect.

[0029] A relief groove 6 is provided in a ring shape on the outer side wall of the body 1. The number of relief grooves 6 is 2 - 4, and the relief grooves 6 are arranged coaxially with the body 1. Since the relief groove 6 is provided in a ring shape on the outer side wall of the body 1, the body 1 has good flexibility. During installation, a good seal can be formed between the outer side wall of the body 1 and the inner side wall of the valve body, improving the service life. The cross-section of the relief groove 6 is arc-shaped, avoiding stress concentration and improving the service life. The number of relief grooves 6 is 2, and the two relief grooves 6 are symmetrically arranged on both sides of the through hole 5, improving the flexibility effect of the body 1. When this sealing ring is installed, the deformation of the body 1 is uniform, improving the service life.

[0030] The body 1 is made of ethylene propylene diene monomer (EPDM) material. The body 1 and the elastic ring 2 are integrally formed by vulcanization, making this sealing ring have good elastic effect, safety and environmental protection, good antioxidant performance and high aging resistance, improving the service life.

[0031] This sealing ring is installed in the valve body of the butterfly valve. The rod body of the valve plate passes through the through hole 5 and the valve plate is installed in the body 1. During use, the edge of the valve plate abuts against the sealing surface 4 to form a seal. Since the middle of the sealing surface 4 is an arc-shaped surface protruding in the middle, the opening and closing resistance of the valve plate is small, and the compression deformation of the body 1 is small, making the sealing performance of the butterfly valve good. Since two elastic rings 2 are wrapped in the middle of the body 1, through the elastic rings 2, the strength of this sealing ring is improved, and the sealing effect and service life are improved.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0033] Although terms such as ontology 1, elastic ring 2, force-applying part 2a, mounting surface 3, sealing surface 4, mounting hole 5, and relief groove 6 are used more frequently in this text, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A new sealing ring for a butterfly valve, comprising an annular body (1), the inner side wall of the body (1) includes mounting surfaces (3) arranged in parallel at the upper and lower ends and a sealing surface (4) connecting the two mounting surfaces (3), through mounting holes (5) are provided on both of the two mounting surfaces (3), and it is characterized in that, The sealing surface (4) is an arc-shaped surface protruding in the middle. Two elastic rings (2) are provided in the middle of the body (1), and the elastic rings (2) are arc-shaped and coaxially arranged with the body (1). The two elastic rings (2) are symmetrically arranged on both sides of the mounting hole (5), and the body (1) wraps the elastic rings (2).

2. The novel sealing ring of a butterfly valve according to claim 1, characterized in that, The cross-section of the elastic ring (2) is U-shaped, and the notch of the elastic ring (2) faces the axis of the body (1) horizontally.

3. A new sealing ring for a butterfly valve according to claim 1, characterized in that, The upper and lower ends of the elastic ring (2) are force-applying parts (2a), and the outer side walls of the force-applying parts (2a) are arc-shaped surfaces protruding in the middle.

4. A novel sealing ring for a butterfly valve according to claim 1 or 2 or 3, characterized in that, A relief groove (6) is annularly arranged on the outer side wall of the body (1). The number of the relief grooves (6) is 2 - 4, and the relief grooves (6) are coaxially arranged with the body (1).

5. The novel sealing ring of a butterfly valve according to claim 4, characterized in that, The number of the relief grooves (6) is 2, and the two relief grooves (6) are symmetrically arranged on both sides of the mounting hole (5).

6. The novel sealing ring of a butterfly valve according to claim 4, characterized in that, The cross-section of the relief groove (6) is arc-shaped.

7. A novel sealing ring for a butterfly valve according to claim 1 or 2 or 3, characterized in that, The body (1) is made of ethylene propylene diene monomer (EPDM) material.

8. A new sealing ring for a butterfly valve according to claim 1 or 2 or 3, characterized in that, The mounting hole (5) is a stepped hole.

9. A novel sealing ring for a butterfly valve according to claim 1 or 2 or 3, characterized in that, The body (1) and the elastic ring (2) are of a vulcanized integral molding structure.

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