Soft sealing butterfly valve

Abstract

The utility model provides a soft sealing butterfly valve which comprises a valve body, a butterfly plate is arranged in the valve body, a sealing ring is arranged in a valve cavity matched with the butterfly plate, and the sealing ring is in contact connection with the periphery of the butterfly plate. The section of the sealing ring is a tongue-shaped section, the innermost ring of the sealing ring is the tip end of the tongue-shaped section, the tongue-shaped section is provided with more than one bend, a step is arranged in the valve cavity, a pressing ring is installed on one side of the step, and the sealing ring is installed on the step through the pressing ring. The sealing ring and the periphery of the butterfly plate are attached more tightly through bending of the sealing ring and elasticity of materials, and therefore the sealing effect in the low-pressure state is improved; when the valve is closed, medium pressure acts on the tongue-shaped part of the sealing ring, and sealing is enhanced. A part of abrasion allowance is reserved through the tongue-shaped section sealing ring with the bend, the sealing ring is still in close contact with the butterfly plate after being bent and stretched after being abraded, and therefore the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a valve, in particular to a soft-sealing butterfly valve. Background Art

[0002] Valves are control components in fluid conveying systems, performing functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief. The name butterfly valve derives from the wing-shaped disc. Within the cylindrical passage of the valve body, the disc-shaped disc rotates around its axis or an axis outside the disc to open and close the valve. Seals are components or measures that prevent fluids or solid particles from leaking between adjacent mating surfaces and prevent external impurities such as dust and moisture from invading the interior of machinery and equipment.

[0003] The soft seal structure is a seal formed by the metal spherical surface of the butterfly plate and the elastic material seal. The elastic material seal is a composite structure, embedded in the step of the valve body and fixed by the pressure ring.

[0004] However, the soft sealing structure has disadvantages: 1. Existing elastic material seals are usually made of solid rubber. As the number of opening and closing increases, the sealing surface will wear, resulting in a decrease in the sealing pressure ratio and failure to achieve a linear sealing state, thus causing leakage; 2. The soft sealing structure does not fit tightly with the butterfly plate under low pressure conditions, resulting in poor sealing effect. Summary of the Invention

[0005] The utility model aims to provide a soft-sealed butterfly valve, which aims to solve the technical problems in the prior art in that the sealing surface may wear out, resulting in a decrease in the sealing pressure ratio and poor sealing effect under low pressure conditions.

[0006] A soft-seal butterfly valve comprises a valve body, wherein a butterfly plate and a valve stem are arranged in the valve body, the valve stem is connected to the butterfly plate, a sealing ring is arranged in the valve cavity cooperating with the butterfly plate, and the sealing ring is in contact with and connected to the outer periphery of the butterfly plate; the cross section of the sealing ring is a tongue-shaped cross section, the innermost circle of the sealing ring is the tip of the tongue-shaped cross section, and the tongue-shaped cross section is provided with more than one bend; a step is provided in the valve cavity, a pressure ring is installed on one side of the step, and the sealing ring is installed on the step through the pressure ring.

[0007] Furthermore, the contact point between the outer periphery of the butterfly plate and the sealing ring is located on the side of the tongue-shaped cross-section of the sealing ring.

[0008] Furthermore, the outer circumference of the butterfly plate is an arc surface.

[0009] Furthermore, the tongue-shaped cross-section of the sealing ring is provided with two bends, and the two bends are in opposite directions.

[0010] Compared with the existing technology, the effects of this utility model are positive and obvious:

[0011] 1. The utility model makes the sealing ring fit more closely with the outer periphery of the butterfly plate through the bending of the sealing ring and the elastic force of the material itself, thereby improving the sealing effect under low pressure conditions. When the valve is closed, the medium pressure acts on the tongue-shaped part of the sealing ring to strengthen the seal.

[0012] 2. The utility model retains a portion of wear margin through the sealing ring with a bent tongue-shaped cross-section. After wear, the bent tongue-shaped cross-section stretches, so that it is always in close contact with the outer periphery of the butterfly plate, thereby extending the service life.

[0013] Working principle:

[0014] The sealing ring is made of elastic materials such as rubber and has a certain elastic force. The cross-section of the sealing ring of the utility model is tongue-shaped and has more than one bend, so that the inner ring of the sealing ring is closely attached to the outer periphery of the butterfly plate through the bending and the elastic force of the sealing ring material itself, thereby improving the sealing effect; at the same time, the bend also serves as a wear allowance. After the inner ring is worn, the bend gradually stretches to release the allowance, and still closely fits the outer periphery of the butterfly plate, thereby maintaining the sealing effect between the sealing ring and the butterfly plate, avoiding leakage, and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 . A schematic side sectional view of an embodiment of the present utility model.

[0016] Figure 2 . Schematic diagram of the connection relationship between the butterfly valve, valve chamber, pressure ring and sealing ring in the embodiment of the present utility model.

[0017] Figure 3 . A schematic diagram of the front structure of the sealing ring part of an embodiment of the present utility model.

[0018] In the figure: 1 valve body; 101 step; 2 butterfly plate; 3 sealing ring; 4 pressure ring. DETAILED DESCRIPTION

[0019] The following examples will further illustrate the present invention, but are not intended to limit the present invention.

[0020] like Figures 1 to 3As shown, this embodiment provides a soft-seal butterfly valve, including a valve body 1, a butterfly plate 2 and a valve stem 5 are arranged in the valve body 1, the valve stem 5 is connected to the butterfly plate 2, and a sealing ring 3 is arranged in the valve cavity cooperating with the butterfly plate 2, specifically, a step 101 is arranged in the valve cavity, a pressure ring 4 is installed in the valve body 1, the pressure ring 4 is installed on one side of the step 101, the outer ring of the pressure ring 4 is installed in cooperation with the inner ring of the step 101, and the sealing ring 3 is located between the pressure ring 4 and the step 101, so that the sealing ring 3 is embedded in the step 101 through the pressure ring 4, thereby achieving the fixing effect of the sealing ring 3.

[0021] Specifically, the pressure ring 4 is connected and fixed to the valve body 1 by bolts.

[0022] The sealing ring 3 is in contact with the outer periphery of the butterfly plate 2 to form a seal. The outer periphery of the butterfly plate 2 is an arc surface, so that the outer periphery of the butterfly plate 2 and the sealing ring 3 are in contact more smoothly, reducing the wear of the sealing ring 3 caused by the outer periphery of the butterfly plate 2.

[0023] The cross-section of the sealing ring 3 is tongue-shaped, with the innermost ring of the sealing ring 3 forming the tip of the tongue-shaped section. The tongue-shaped section is provided with two bends, one positive and one negative. The bends of the sealing ring 3 and the elastic force of the material itself allow the sealing ring 3 to fit more closely with the outer periphery of the butterfly plate 2, thereby improving the sealing effect under low-pressure conditions. In addition, the tongue-shaped section with a bend retains a certain amount of wear margin. After the sealing ring 3 wears, these bends gradually expand due to the elastic force of the material itself. During this period, the sealing ring 3 always maintains close contact with the butterfly plate 2, thereby extending its service life and preventing leakage caused by wear.

[0024] The contact point between the outer periphery of the butterfly plate 2 and the sealing ring 3 is located on the side of the tongue-shaped section of the sealing ring 3. Compared with the tip of the tongue-shaped section, the side contact area of ​​the tongue-shaped section is larger and the sealing effect is better.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A soft-sealed butterfly valve, comprising a valve body (1), a butterfly plate (2) and a valve stem (5) disposed in the valve body (1), the valve stem (5) being connected to the butterfly plate (2), and a sealing ring (3) being disposed in a valve cavity cooperating with the butterfly plate (2), characterized in that: The sealing ring (3) is in contact with the outer periphery of the butterfly plate (2); the cross section of the sealing ring (3) is a tongue-shaped cross section, the innermost circle of the sealing ring (3) is the tip of the tongue-shaped cross section, and the tongue-shaped cross section is provided with one or more bends; A step (101) is provided in the valve cavity, a pressure ring (4) is installed on one side of the step (101), and the sealing ring (3) is installed on the step (101) through the pressure ring (4).

2. A soft-seal butterfly valve according to claim 1, characterized in that: The contact point between the outer periphery of the butterfly plate (2) and the sealing ring (3) is located on the side of the tongue-shaped cross-section of the sealing ring (3).

3. The soft-seal butterfly valve according to claim 1, characterized in that: The outer periphery of the butterfly plate (2) is an arc surface.

4. The soft-sealed butterfly valve according to claim 1, characterized in that: The tongue-shaped cross-section of the sealing ring (3) is provided with two bends, and the two bends are in opposite directions.

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