Butterfly valve sealing structure and butterfly valve

Abstract

The utility model discloses a butterfly valve sealing structure and butterfly valve, including butterfly plate, valve body and compression pad, the end surface of valve body is equipped with first recess, and the end surface of compression pad is equipped with second recess, compression pad is coaxial with valve body, and the end surface of compression pad is pressed together in the end surface of valve body, and makes first recess and second recess opposite setting form the recess for installing sealing washer, the opening of recess is toward butterfly plate, and the opening diameter of recess is less than the bottom diameter of recess, the tail portion of sealing washer is embedded in recess, makes sealing washer fixed between valve body and compression pad, the head of sealing washer is toward butterfly plate and at least partial convexity in recess, and the head of sealing washer has a containing space, and is equipped with elastic part in containing space, when butterfly valve is in the closed state, and the head of sealing washer is extruded and forms the interference fit of butterfly plate, and elastic part is extruded and provides the elasticity, makes butterfly plate and sealing washer keep contact, realizes the positive and negative two -way sealing of butterfly valve, zero leakage seal, self -compensating type seal and positive feedback seal.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a butterfly valve sealing structure and a butterfly valve. Background Technology

[0002] With the development of many industries, high-performance butterfly valves are frequently and importantly used in working conditions involving flammable, explosive, and highly corrosive substances such as chemicals and petroleum products. High-performance butterfly valves play a significant role in highly corrosive or acidic, low-to-medium pressure conditions, possessing extremely high economic value. However, existing butterfly valve sealing structures suffer from displacement or deformation of the butterfly plate under certain fluid pressure. This reduces or even eliminates the interference fit between the butterfly plate and the valve's sealing structure, leading to fluid leakage. In other words, existing butterfly valve sealing structures cannot meet the sealing requirements when the butterfly plate tends to move away from the sealing structure under fluid pressure.

[0003] The statements herein provide only background information relating to this invention and do not necessarily constitute prior art. Utility Model Content

[0004] The purpose of this invention is to provide a high-performance butterfly valve sealing structure and butterfly valve that is robust, simple in structure, and easy to manufacture, so as to achieve bidirectional sealing, zero leakage sealing, self-compensating sealing, positive feedback sealing, and long service life.

[0005] To achieve the above objectives, this utility model provides a butterfly valve sealing structure, including a butterfly plate, a valve body, and a pressure plate. A valve shaft is vertically arranged in the central channel of the valve body, and the butterfly plate is sleeved on the valve shaft. A first recess is provided on the end face of the valve body, and a second recess is provided on the end face of the pressure plate. The pressure plate is coaxially arranged with the valve body, and the end face of the pressure plate presses against the end face of the valve body, so that the first and second recesses are opposite to each other to form a groove for installing a sealing ring. The opening of the groove faces the butterfly plate, and the opening diameter of the groove is smaller than the bottom diameter of the groove. The tail of the sealing ring is embedded in the groove, fixing the sealing ring between the valve body and the pressure plate. The head of the sealing ring faces the butterfly plate and at least partially protrudes from the groove. The head of the sealing ring has a receiving space, and an elastic element is provided within the receiving space. When the butterfly valve is in the closed state, the butterfly plate presses against the head of the sealing ring to form an interference fit, and the elastic element is compressed to provide elastic force, keeping the butterfly plate in contact with the sealing ring, thus achieving butterfly valve sealing.

[0006] In one embodiment, the bottom surface of the second recess is provided with a protrusion, and the protrusion and the middle part of the sealing ring are formed by interference fit to form a seal between the sealing ring and the pressure plate.

[0007] In one embodiment, the height of the protrusion is 0.4 mm, so that the protrusion and the middle of the sealing ring form an interference fit of 0.6-0.8 mm.

[0008] In one embodiment, the width of the groove is 0.4-0.5 mm smaller than the thickness of the tail of the sealing ring.

[0009] In one embodiment, the portion of the head of the sealing ring that protrudes from the groove is the active area, and the area where the head of the sealing ring is enclosed by the groove is the constrained area, wherein the width of the active area is smaller than the width of the constrained area.

[0010] In one embodiment, the width of the active area is 2 mm, and the width of the constraint area is 3 mm.

[0011] In one embodiment, the elastic element is a metal coil spring.

[0012] In one embodiment, the sealing ring is made of polytetrafluoroethylene or rubber.

[0013] This utility model also provides a butterfly valve, comprising: a valve body having a central channel in which a valve shaft is vertically disposed; a butterfly plate sleeved on the valve shaft and rotating around the valve shaft; a pressure plate pressed onto the valve body and coaxially disposed with the valve body; and the butterfly valve sealing structure as described above.

[0014] Compared with existing technologies, the butterfly valve sealing structure and butterfly valve of this invention have at least the following beneficial effects: This invention, by setting an elastic element in the accommodating space of the sealing ring head, allows the butterfly plate to press against the sealing ring head to form an interference fit. The elastic element, under compression, provides elastic force, ensuring tight contact between the butterfly plate and the sealing ring, thereby achieving effective sealing of the butterfly valve. Simultaneously, the sealing strength of the butterfly valve sealing structure of this invention increases with the increase of the medium pressure, achieving positive feedback sealing.

[0015] Secondly, when the head of the sealing ring experiences some wear, the elastic element can release its stored energy, causing the head of the sealing ring to deform towards the butterfly plate. This ensures the self-adjustment of the sealing ring after slight wear, maintaining sealing strength and achieving self-compensating sealing. This invention uses a small number of simple components, is easy to manufacture, and has a long service life. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the butterfly valve sealing structure of this utility model; Figure 2 This is a schematic diagram of the sealing structure of the butterfly valve without the sealing ring of this utility model; Figure 3 This is a partially enlarged schematic diagram of the pressure plate of this utility model; Figure 4 This is a schematic diagram of the sealing ring of this utility model; Figure 5 This is a schematic diagram of the butterfly valve of this utility model. Detailed Implementation

[0017] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the butterfly valve sealing structure and butterfly valve proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0018] This utility model provides a high-performance butterfly valve sealing structure that is robust, simple in structure, and easy to manufacture, such as... Figures 1-5 As shown, the butterfly valve sealing structure includes a butterfly plate 10, a valve body 20, and a pressure plate 30. A valve shaft 23 is vertically arranged in the central channel 22 of the valve body 10, and the butterfly plate 10 is sleeved on the valve shaft 20. A first recess 21 is provided on the end face of the valve body 20, and a second recess 31 is provided on the end face of the pressure plate 30. The pressure plate 30 is coaxially arranged with the valve body 20, and the end face of the pressure plate 30 is pressed against the end face of the valve body 20, so that the first recess 21 and the second recess 31 are arranged opposite to each other to form a groove 50 for installing a sealing ring 40. The opening of the groove 50 faces the butterfly plate 10, and the opening diameter of the groove 50 is smaller than the bottom diameter of the groove 50. The tail 41 of the sealing ring 40 is embedded in the groove 50, so that the... A sealing ring 40 is fixed between the valve body 20 and the pressure plate 30; the head 42 of the sealing ring 40 faces the butterfly plate 10 and at least partially protrudes from the groove 50, and the head 42 of the sealing ring 40 has a receiving space 421, in which an elastic element 43 is provided; when the butterfly valve is in the closed state, the butterfly plate 10 presses the head 42 of the sealing ring 40 to form an interference fit, and the elastic element 43 is compressed to provide elastic force, so that the butterfly plate 10 and the sealing ring 40 are in close contact, thereby achieving the sealing of the butterfly valve.

[0019] Among them, such as Figure 1and Figure 2 As shown, Figure 2 This is a schematic diagram of the butterfly valve sealing structure without the sealing ring 40 installed. To ensure that the single-sided interference between the tail 41 of the sealing ring 40 and the groove 50 is 0.2-0.25 mm, that is, the single-sided interference between the upper surface of the tail 41 of the sealing ring 40 and the first recess 21 is 0.2-0.25 mm, and the single-sided interference between the lower surface of the tail 41 of the sealing ring 40 and the second recess 31 is 0.2-0.25 mm, the width of the groove 50 is 0.4-0.5 mm smaller than the thickness of the tail 41 of the sealing ring 40. The width of the groove 50 refers to the span in the direction parallel to the opening (i.e., the vertical direction).

[0020] Furthermore, such as Figures 2-4 As shown, the bottom surface of the second recess 31 is provided with a protrusion 32. The protrusion 32 presses against the middle portion 44 of the sealing ring 40, so that the protrusion 32 and the middle portion 44 of the sealing ring 40 form a seal between the sealing ring 40 and the pressure plate 30 through an interference fit. At the same time, because the protrusion 32 presses against the middle portion 44 of the sealing ring 40, the outer surfaces of the middle portion 44 and the tail portion 40 of the sealing ring 40 located in the groove 50 are tightly fitted with the inner surface of the groove 50, forming a seal on the groove 50 and preventing the sealing ring 40 from being pulled out when the butterfly plate 10 rotates. This not only improves the installation stability of the sealing ring 40, but also achieves zero-leakage sealing. In this embodiment, the protrusion 32 is a convex ball with a semi-arc cross-sectional shape, which can increase the contact area between the protrusion 32 and the sealing ring 40 and reduce wear on the sealing ring 40. In other embodiments, the protrusion 32 can also be a boss, a protrusion, or other structures, which are not limited in this invention.

[0021] Since the height of the protrusion depends on the interference fit, after testing, to ensure that the protrusion and the center of the sealing ring form an interference fit of 0.6-0.8 mm, in this embodiment, the height of the protrusion is 0.4 mm to achieve a high-strength and stable assembly connection. If the interference fit is less than 0.6 mm, insufficient radial pressure may result in insufficient connection force, making it unable to withstand large loads or prone to loosening due to the rotation of the disc plate; if the interference fit exceeds 0.8 mm, it will require greater external force (such as pressure) during assembly, which may cause damage to the inner surface of the groove 50; at the same time, the difficulty of disassembly will increase significantly, which is not conducive to later maintenance or replacement of the sealing ring 40. It should be noted that when the thickness of the center 44 of the sealing ring 40 increases, the height of the protrusion should also be reduced accordingly.

[0022] Furthermore, in this embodiment, as Figure 1 and Figure 4As shown, the sealing ring 40 is made of polytetrafluoroethylene (PTFE), and the elastic element 43 disposed within the accommodating space 421 is a metal coil spring. The head of the sealing ring 40 is formed by an outer ring enclosing the metal coil spring. The metal coil spring acts as an elastic energy amplification device for the sealing ring 40, increasing its elasticity with increasing medium pressure within its normal operating range, thereby achieving positive feedback sealing. Specifically, when the valve is closed, the butterfly plate 10 and the sealing ring 40 form an interference fit, and the butterfly plate 10 compresses the head 42 of the sealing ring 40 (i.e., the end closest to the butterfly plate). The high elasticity provided by the metal coil spring achieves the positive feedback sealing function. In other embodiments, the sealing ring 40 may also be made of rubber.

[0023] Among them, such as Figure 1 and Figure 5 As shown, the portion of the head 42 of the sealing ring 40 protruding from the groove 50 is the active area 422, and the area of ​​the head 42 of the sealing ring 40 enclosed by the groove 50 is the constraint area 423. The width d1 of the active area 422 is smaller than the width d2 of the constraint area 423. In this embodiment, the width d1 of the active area 422 is 2 mm, and the width d2 of the constraint area 423 is 3 mm. When the pressure on one side of the central channel 22 increases, for example, when the pressure on the valve body 20 increases (i.e., in the positive direction), the pressure on the butterfly plate 10 increases, and consequently, the compression of the sealing ring 40 by the butterfly plate 10 increases, causing the head 42 of the sealing ring 40 to deform towards the pressure plate 30. Under the semi-enclosed constraint of the head 42 of the sealing ring 40 by the pressure plate 30, due to the elasticity of the metal ring spring in the accommodating space 421, it will also deform in both directions of the butterfly plate 10 and the protrusion 32 of the pressure plate 30, thereby enhancing the sealing performance and forming a bidirectional seal.

[0024] Furthermore, after the butterfly valve has been operating normally for a period of time, the head 42 of the sealing ring 40 will experience some wear, and the outer ring of the sealing ring 40 will have reduced ability to wrap and constrain the elastic element 43. At this time, the elastic element 43 can release its stored energy, causing the head 42 of the sealing ring 40 to deform towards the butterfly plate 10, thereby ensuring the self-adjustment of the sealing ring 40 after slight wear to maintain the sealing strength and form a self-compensating seal.

[0025] Accordingly, embodiments of this utility model also provide a butterfly valve, such as... Figure 1 and Figure 5As shown, it includes: a valve body 20 having a central channel 22, in which a valve shaft 23 is vertically disposed; a butterfly plate 10, which is sleeved on the valve shaft 23 and rotates around the valve shaft 23; a pressure plate 30, which is pressed onto the valve body 20 and is coaxially disposed with the valve body 20; and a butterfly valve sealing structure as described in the above embodiment, so as to achieve bidirectional sealing, zero leakage sealing, self-compensating sealing, positive feedback sealing and long service life of the butterfly valve.

[0026] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] In the description of this utility model, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A butterfly valve sealing structure, comprising a butterfly plate, a valve body, and a pressure plate, wherein a valve shaft is vertically disposed within a central channel of the valve body, and the butterfly plate is sleeved on the valve shaft, characterized in that, The valve body has a first recess on its end face and the pressure plate has a second recess on its end face; the pressure plate is coaxially arranged with the valve body and the end face of the pressure plate is pressed against the end face of the valve body, so that the first recess and the second recess are arranged opposite to each other to form a groove for installing a sealing ring; The opening of the groove faces the butterfly plate, and the opening diameter of the groove is smaller than the bottom diameter of the groove; The tail of the sealing ring is embedded in the groove, so that the sealing ring is fixed between the valve body and the pressure plate; The head of the sealing ring faces the butterfly plate and at least partially protrudes from the groove. The head of the sealing ring has a receiving space, and an elastic element is provided in the receiving space. When the butterfly valve is in the closed state, the butterfly plate presses against the head of the sealing ring to form an interference fit. The elastic element is compressed and provides elastic force, so that the butterfly plate and the sealing ring remain in contact, thereby achieving butterfly valve sealing.

2. The butterfly valve sealing structure as described in claim 1, characterized in that, The bottom surface of the second recess is provided with a protrusion, and the protrusion and the middle part of the sealing ring are formed by interference fit to form a seal between the sealing ring and the pressure plate.

3. The butterfly valve sealing structure as described in claim 2, characterized in that, The height of the protrusion is 0.4 mm, so that the protrusion and the middle of the sealing ring form an interference of 0.6-0.8 mm.

4. The butterfly valve sealing structure as described in claim 1, characterized in that, The width of the groove is 0.4-0.5 mm smaller than the thickness of the tail of the sealing ring.

5. The butterfly valve sealing structure as described in claim 1, characterized in that, The portion of the head of the sealing ring that protrudes from the groove is the active area, and the area where the head of the sealing ring is enclosed by the groove is the constrained area. The width of the active area is smaller than the width of the constrained area.

6. The butterfly valve sealing structure as described in claim 5, characterized in that, The width of the active area is 2 mm, and the width of the constraint area is 3 mm.

7. The butterfly valve sealing structure as described in claim 1, characterized in that, The elastic element is a metal coil spring.

8. The butterfly valve sealing structure as described in claim 1, characterized in that, The sealing ring is made of polytetrafluoroethylene or rubber.

9. A butterfly valve, characterized in that, include: The valve body has a central channel in which a valve shaft is vertically disposed; A butterfly plate, which is sleeved on the valve shaft and rotates around the valve shaft; A pressure plate is pressed onto the valve body and is coaxially arranged with the valve body; And the butterfly valve sealing structure as described in any one of claims 1 to 8.

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