Sealing ring for valve rod of butterfly valve

Abstract

The utility model relates to the technical field of valves, and discloses a sealing ring for a valve rod of a butterfly valve, which belongs to rubber materials, the sealing ring adopts an inner and outer ring double structure with an inner ring surface and an outer ring surface, a gap extending along the circumferential direction is arranged between the inner ring surface and the outer ring surface, and a connecting part is connected between the outer ends of the same sides of the inner ring surface and the outer ring surface; the radial width of the outer ring face is larger than that of the inner ring face, and meanwhile the outer ring face can make full contact with a sealing groove in the valve body. And a spring is annularly sleeved on the outer ring on one side, close to the outer ring surface, of the inner ring surface. The double structure of the inner ring and the outer ring is adopted, meanwhile, the reinforcing design of the spring is arranged in the inner ring, the spring tightens the holding force between the sealing ring and the valve rod, and the sealing effect between the sealing ring and the valve rod is fully guaranteed; meanwhile, the outer ring face with the radial width larger than that of the inner ring face can make full contact with the sealing groove in the valve body, and zero leakage under the gas and vacuum working conditions is achieved through the soft sealing characteristic.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically to a butterfly valve stem sealing ring. Background Art

[0002] Butterfly valves are mainly used in many industries such as petrochemicals, food and beverages, and machinery manufacturing. They are a type of throttling valve that consists of a valve body, a valve stem, a butterfly plate, and a sealing ring. In the closed state, the butterfly plate rotates to block the pipeline to achieve a flow cutoff effect. It is widely used because of its simple structure, light weight, and long service life. The valve stem is an important component of the butterfly valve, which is used for transmission. It is connected to the actuator or handle on the upper side and directly drives the valve core to move or rotate below to achieve the valve switch or regulation function. Because the valve stem is a movable part, it is the part that is most likely to leak. Therefore, the valve stem seal is very important for the valve.

[0003] The butterfly valve stem seals on the current market are all made of wear-resistant materials such as rubber sleeves, copper sleeves, and flexible graphite. However, an ordinary rubber O-ring can only be used in ordinary working conditions. If copper sleeves and PTFE tube seals are used, although they are easier to install, have low cost, and are easy to replace, they will have poor sealing performance due to the hard material and lack of resilience. Especially when the medium is gas or vacuum conditions, the ability of these seals to resist leakage and the sealing strength cannot meet the actual use requirements.

[0004] Therefore, it is necessary to improve and upgrade the existing butterfly valve stem sealing structure to completely solve the shortcomings of poor sealing and vacuum leakage at the valve stem. Utility Model Content

[0005] In view of this, the utility model proposes a butterfly valve stem sealing ring, and its specific technical solution is as follows:

[0006] A butterfly valve stem sealing ring is a sealing ring made of rubber material. The sealing ring adopts a double structure of an inner and outer ring with an inner ring surface and an outer ring surface. A gap extending in the circumferential direction is provided between the inner ring surface and the outer ring surface, and a connecting portion is connected between the outer ends of the inner ring surface and the outer ring surface on the same side; the radial width of the outer ring surface is greater than the radial width of the inner ring surface, and the outer ring surface can fully contact the sealing groove on the valve body; a spring is provided on the outer ring sleeve on the side of the inner ring surface close to the outer ring surface.

[0007] Preferably, the inner ring surface is a high elastic inner ring with thin and soft characteristics.

[0008] Preferably, one end of the inner annular surface away from the connecting portion is provided with a thin flange extending toward the outer annular surface.

[0009] Preferably, a plurality of reinforcing ribs are provided on a surface of the connecting portion facing the gap.

[0010] Compared with the prior art, the utility model adopts a double structure of inner and outer rings for the butterfly valve stem seal ring made of rubber material, and the inner ring is reinforced with a spring. The spring tightens the gripping force between the seal ring and the valve stem, fully ensuring the sealing effect between the seal ring and the valve stem. In addition, the radial width of the outer ring surface in the utility model is greater than the radial width of the inner ring surface, and the outer ring surface can fully contact the sealing groove on the valve body. Its soft sealing characteristics also enable it to achieve zero leakage under gas and vacuum conditions.

[0011] The utility model has excellent overall performance and can be used in all complex working conditions, and has the characteristics of simple and practical structure, convenient installation and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0013] Figure 1 This is an axonometric measurement of a butterfly valve stem sealing ring of the utility model. Figure 1 .

[0014] Figure 2 This is an axonometric measurement of a butterfly valve stem sealing ring of the utility model. Figure 2 .

[0015] Figure 3 The utility model is a front view of a butterfly valve stem sealing ring.

[0016] Figure 4 The utility model is a back view of a butterfly valve stem sealing ring.

[0017] In the figure: 1-inner annular surface, 2-outer annular surface, 3-connecting portion, 4-spring, 5-thin flange, 6-reinforcement rib. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] Example:

[0022] like Figure 1-Figure 4 As shown, the utility model provides a butterfly valve stem sealing ring, which is used to make the sealing ring contact with the valve body and the valve stem in a closed state, and play the role of sealing medium.

[0023] The utility model belongs to a sealing ring made of rubber material, more specifically, a modified product of nitrile rubber selectively hydrogenated, has the characteristics of high and low temperature resistance, wear resistance, ozone resistance, radiation resistance, heat and oxygen aging resistance, resistance to various media, and excellent comprehensive performance.

[0024] The sealing ring adopts a double structure of an inner and outer ring with an inner ring surface 1 and an outer ring surface 2. A gap extending in the circumferential direction is provided between the inner ring surface 1 and the outer ring surface 2, and a connecting portion 3 is connected between the outer ends of the inner ring surface 1 and the outer ring surface 2 on the same side; the radial width of the outer ring surface 2 is greater than the radial width of the inner ring surface 1, and the outer ring surface 2 can fully contact the sealing groove on the valve body; a spring 4 is provided on the outer ring sleeve of the inner ring surface 1 on the side close to the outer ring surface 2.

[0025] The utility model adopts a double structure of inner and outer rings, and at the same time, the inner ring has a built-in spring reinforcement design. The spring tightens the gripping force between the sealing ring and the valve stem, thereby fully ensuring the sealing effect between the sealing ring and the valve stem.

[0026] Moreover, the radial width of the outer ring surface 2 in the utility model is greater than the radial width of the inner ring surface 1. At the same time, the outer ring surface 2 can fully contact the sealing groove on the valve body, and its soft sealing characteristics also enable it to achieve zero leakage under gas and vacuum conditions.

[0027] More specifically, the inner ring surface 1 is a highly elastic inner ring with thin and soft characteristics, which can ensure sufficient contact between it and the valve stem and enhance the sealing effect.

[0028] At the same time, a thin flange 5 extending toward the outer ring surface is provided at one end of the inner ring surface 1 away from the connecting portion 3 to limit the spring 4 .

[0029] More specifically, a plurality of reinforcing ribs 6 are provided on a surface of the connecting portion 3 facing the gap to ensure the service life of the sealing ring.

[0030] The utility model discloses a butterfly valve stem sealing ring which can replace sealing packing and solve the problems of poor sealing and vacuum leakage at the valve stem. It has excellent performance and is resistant to oil, corrosion, high temperature, oxidation, ozone and dynamic fatigue, and can be used in all complex working conditions. Moreover, it has a simple and practical structure and is easy to install and maintain.

[0031] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A butterfly valve stem sealing ring, which is a sealing ring made of rubber material, characterized in that: The sealing ring adopts a double structure of an inner and outer ring with an inner ring surface and an outer ring surface, a gap extending in the circumferential direction is provided between the inner ring surface and the outer ring surface, and a connecting portion is connected between the outer ends on the same side of the inner ring surface and the outer ring surface; the radial width of the outer ring surface is greater than the radial width of the inner ring surface, and the outer ring surface can fully contact the sealing groove on the valve body; a spring is provided on the outer ring sleeve on the side of the inner ring surface close to the outer ring surface.

2. A butterfly valve stem sealing ring according to claim 1, characterized in that: The inner ring surface is a high elastic inner ring with thin and soft characteristics.

3. A butterfly valve stem sealing ring according to claim 2, characterized in that: One end of the inner annular surface away from the connecting portion is provided with a thin flange extending toward the outer annular surface.

4. A butterfly valve stem sealing ring according to any one of claims 1 to 3, characterized in that: A plurality of reinforcing ribs are arranged on a surface of the connecting portion facing the gap.

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