Butterfly valve sealing structure

Abstract

The utility model provides a butterfly valve sealing structure relates to valve body sealing structure technical field, including butterfly valve main part and butterfly plate, the inner wall of butterfly valve main part is equipped with sealing rubber cover, the rotation angle of butterfly plate is 90 DEG, the dam bump ring in the inside of sealing rubber cover is contacted to the closed state of butterfly plate, the number of dam bump ring has two, and corresponds respectively with butterfly plate sealed rotation end, the extrusion transition path is equipped with in the sealing rubber cover inside located dam bump ring and butterfly plate rotation path, the extrusion transition path multistage design is by the outside to dam bump ring in turn heightens, through increasing extrusion transition path between butterfly plate and valve seat (sealing rubber cover), and extrusion transition path multistage design is by the outside to dam bump ring in turn heightens, changed the contact mode when butterfly plate opens and closes, avoided butterfly plate and valve seat direct extrusion scraping, reduced the sealing surface wear, thereby promoted the service life and sealing effect of valve.

Description

Technical Field

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

[0002] As a widely used fluid control device, the core function of a butterfly valve lies in achieving reliable sealing performance to ensure the normal flow of the medium. Butterfly valves achieve excellent sealing effects through different sealing structure designs, such as centerline sealing, single eccentric, double eccentric, and triple eccentric types. Among these, the centerline sealing butterfly valve is the most commonly used due to its simple structure, low cost, and ease of operation. This type of valve is characterized by the valve stem axis, the center of the butterfly plate, and the center of the valve body being located on the same axis, forming a symmetrical, non-biased structure. This results in balanced torque during valve opening and closing, low operating torque, simple manufacturing process, and low cost.

[0003] However, despite the excellent performance of the center-sealed butterfly valve in many aspects, it also has some shortcomings in practical applications: during the valve opening and closing process, the squeezing and scraping between the butterfly plate and the valve seat will cause the sealing surface to wear faster, thus affecting the service life and sealing effect of the valve. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by improving the sealing structure of existing butterfly valves. This involves adding a transition structure between the butterfly plate and the valve seat, and strengthening the mating part to make the contact tighter, thereby increasing service life and reducing leakage problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A butterfly valve sealing structure includes a butterfly valve body and a butterfly plate. The inner wall of the butterfly valve body is provided with a sealing sleeve. The butterfly plate has a rotation angle of 90°. When the butterfly plate is closed, it abuts against a retaining dam protrusion inside the sealing sleeve. There are two retaining dam protrusions, which correspond to the sealing rotation ends of the butterfly plate respectively.

[0007] The inner side of the sealing sleeve is provided with extrusion transition paths on the rotation path of the retaining dam protrusion ring and the butterfly plate. The extrusion transition path is designed in multiple segments, which increase in height from the outside towards the retaining dam protrusion ring.

[0008] Furthermore, the butterfly plate is installed inside the butterfly valve body, and a valve shaft is provided on the center line to rotate within the butterfly valve body.

[0009] Furthermore, the retaining bulge and the sealing sleeve are provided with a reinforcing ring, the reinforcing ring having a cross-shaped cross section.

[0010] Furthermore, the retaining bulge surface corresponding to the rotating end of the butterfly plate is a plane, and when the butterfly plate is closed, it is parallel to the short side of the reinforcing ring and fits against the retaining bulge.

[0011] Furthermore, the number of extrusion transition paths is no less than three segments, and each segment has an arc design at the joint. The innermost segment of the extrusion transition path has an abutment embedding groove.

[0012] Furthermore, the extrusion transition path is semi-circular and mates with one side of the butterfly plate.

[0013] Furthermore, each end of the butterfly plate is provided with an arc-shaped surface, and the arc of the convex annular surface facing the dam is greater than that of the arc-shaped surface at the other end.

[0014] Furthermore, a rubber sleeve is provided on the arc-shaped surface facing the end of the retaining dam convex ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By adding a compression transition path between the butterfly plate and the valve seat (sealing sleeve), and the multi-segment design of the compression transition path increasing in height from the outside towards the retaining dam ring, the contact mode of the butterfly plate during opening and closing is changed, avoiding direct compression and scraping between the butterfly plate and the valve seat, reducing wear on the sealing surface, thereby improving the service life and sealing effect of the valve.

[0017] 2. The retaining dam ring and the sealing sleeve are equipped with a reinforcing ring with a cross-shaped cross section, which enhances the structural strength of the retaining dam ring. At the same time, the retaining dam ring surface corresponding to the rotating end of the butterfly plate is flat. When the butterfly plate is closed, it is parallel to the short side of the reinforcing ring and fits against the retaining dam ring, making the contact between the butterfly plate and the retaining dam ring tighter and further reducing the possibility of seepage problems.

[0018] 3. The number of extrusion transition paths is no less than three, and the connection of each section is an arc design. The innermost extrusion transition path has an abutment embedding groove. This design makes the contact between the butterfly plate and the extrusion transition path smoother during opening and closing, further reducing wear. The extrusion transition path is semi-circular and fits with one side of the butterfly plate. The ends of the butterfly plate are respectively provided with arc surfaces, and the arc of the side facing the dam convex ring is greater than that of the other end arc surface. A rubber sleeve is provided on the arc surface facing the dam convex ring. These structural optimizations effectively reduce the friction and wear between the butterfly plate and the sealing structure, and extend the service life of the valve. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a butterfly valve sealing structure provided by this utility model;

[0020] Figure 2 This is a partial enlarged structural diagram (A) of a butterfly valve sealing structure provided by this utility model;

[0021] Figure 3 A schematic diagram of the anatomical plan of the sealing sleeve portion of a butterfly valve sealing structure provided by this utility model;

[0022] Figure 4 This is a partial enlarged schematic diagram of the sealing structure of a butterfly valve provided by this utility model.

[0023] Illustration: 1. Butterfly valve body;

[0024] 2. Butterfly plate; 21. Curved surface; 22. Rubber lining sleeve;

[0025] 3. Sealing sleeve; 31. Reinforcing ring;

[0026] 4. Dam retaining ring;

[0027] 5. Extrusion transition path; 51. Abutment embedding groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Example 1

[0033] like Figures 1-4 As shown, this utility model provides a technical solution: a butterfly valve sealing structure, including a butterfly valve body 1 and a butterfly plate 2. The butterfly valve body 1 serves as the supporting frame for the entire butterfly valve, providing installation space and structural stability for the internal components. The inner wall of the butterfly valve body 1 is provided with a sealing sleeve 3, which has good elasticity and sealing performance, effectively preventing media leakage. The butterfly plate 2 has a rotation angle of 90°, allowing the valve to be opened and closed by rotating it 90°. In the closed state, the butterfly plate 2 abuts against a retaining ring 4 inside the sealing sleeve 3. There are two retaining rings 4, each corresponding to the sealing rotating end of the butterfly plate 2. The retaining rings 4 serve to block and seal, ensuring that the media does not leak when the valve is closed.

[0034] The inner side of the sealing sleeve 3 is provided with a compression transition path 5 on the rotation path of the retaining dam protrusion 4 and the butterfly plate 2. The compression transition path 5 is designed in multiple segments, which increase in height from the outside towards the retaining dam protrusion 4. This design ensures that the butterfly plate 2 does not directly exert strong pressure on the retaining dam protrusion 4 during the closing process, but is first guided and buffered by the compression transition path 5. This reduces the direct impact and wear between the butterfly plate 2 and the sealing structure, and improves the service life of the sealing structure.

[0035] Example 2

[0036] like Figures 1-4As shown, the butterfly plate 2 is installed inside the butterfly valve body 1, and a valve shaft is located on the center line and rotates within the butterfly valve body 1. The valve shaft is the core component for the rotation of the butterfly plate 2. The rotation of the valve shaft drives the butterfly plate 2 to achieve opening and closing actions. The fit between the valve shaft and the butterfly valve body 1 is highly precise to ensure smooth and reliable rotation. A reinforcing ring 31 is provided inside the retaining dam ring 4 and the sealing sleeve 3. The reinforcing ring 31 has a cross-shaped cross section. The function of the reinforcing ring 31 is to enhance the structural strength of the retaining dam ring 4 and the sealing sleeve 3, preventing deformation of the retaining dam ring 4 and the sealing sleeve 3 due to the pressure of the medium and the squeezing action of the butterfly plate 2 during long-term use, thus affecting the sealing performance. The cross-shaped design provides support in multiple directions, improving structural stability. The surface of the retaining dam ring 4 corresponding to the sealing rotating end of the butterfly plate 2 is flat. When the butterfly plate 2 is closed, it is parallel to the short side of the reinforcing ring 31 and fits against the retaining dam ring 4. This design allows the butterfly plate 2 to form a tight fit with the retaining ring 4 when closed, reducing leakage channels and improving the sealing effect. Simultaneously, its parallel alignment with the short side of the reinforcing ring 31 ensures uniform force distribution on the butterfly plate 2 during closure, preventing uneven force distribution that could lead to poor sealing or component damage. The extrusion transition path 5 consists of at least three segments, each with a rounded joint. The innermost segment of the extrusion transition path 5 has an abutment groove 51. The multi-segment design and rounded joints allow for a smoother transition of the butterfly plate 2 during closure, reducing friction and wear. The abutment groove 51 provides an embedding position for the butterfly plate 2 when it is fully closed, further enhancing the sealing effect and preventing media leakage. The extrusion transition path 5 is semi-circular and fits into one side of the butterfly plate 2. This semi-circular design better adapts to the shape of the butterfly plate 2, resulting in a tighter contact and reducing stress concentration, thus improving the reliability of the sealing structure. The ends of the butterfly plate 2 are each provided with an arc-shaped surface 21, with the arc facing the retaining ring 4 being greater than that of the other end. This design allows the butterfly plate 2 to better cooperate with the retaining ring 4 and the extrusion transition path 5 during the closing process, reducing collision and wear; the arc-shaped surface 21 facing the retaining ring 4 is provided with a rubber sleeve 22, which has good elasticity and wear resistance, and can further reduce the friction between the butterfly plate 2 and the retaining ring 4, improving sealing performance and service life.

[0037] The working process of this utility model is as follows: When using a butterfly valve sealing structure, first install the butterfly valve into the pipeline system, ensuring that the butterfly valve is installed in the correct position, the connection is firm, and the fit between the components meets the requirements. During the installation process, pay attention to checking whether the sealing sleeve 3, the retaining dam convex ring 4, the reinforcing ring 31, and other components are intact and undamaged. If any damage is found, it should be replaced in time.

[0038] Then, the valve is debugged. By operating the valve shaft (including manual, pneumatic and electric drive methods), the butterfly plate 2 is rotated within the range of 0°-90°. Check whether the butterfly plate 2 rotates flexibly and whether there is any jamming. At the same time, observe the cooperation between the butterfly plate 2 and the sealing sleeve 3, the extrusion transition path 5 and other components during the rotation process to ensure that the gap between each component is uniform and there is no abnormal friction.

[0039] When the valve needs to be closed, slowly rotate the valve shaft to gradually rotate the butterfly plate 2 towards the closed position. During the rotation, the butterfly plate 2 first contacts the outer side of the compression transition path 5. As the rotation continues, the butterfly plate 2 gradually moves closer to the retaining dam ring 4 along the compression transition path 5. Because the compression transition path 5 is designed with multiple segments that increase in height from the outer side towards the retaining dam ring 4, the compression force on the butterfly plate 2 gradually increases during the movement. This progressive compression method reduces the direct impact and wear between the butterfly plate 2 and the sealing structure.

[0040] When the butterfly plate 2 rotates to the near-closed position, the arc-shaped surface 21 at the end of the butterfly plate 2 engages with the semi-circular portion of the extrusion transition path 5. At the same time, the rubber sleeve 22 on the arc-shaped surface 21 facing the end of the retaining dam ring 4 further contacts the extrusion transition path 5 and the retaining dam ring 4, playing a role in buffering and sealing. Finally, the butterfly plate 2 is completely closed and embedded in the abutment groove 51 of the innermost section of the extrusion transition path 5, which fits tightly with the retaining dam ring 4. Meanwhile, the surface of the retaining dam ring 4 corresponding to the sealing rotating end of the butterfly plate 2 is flat and parallel to the short side of the reinforcing ring 31, ensuring the sealing performance of the valve after it is closed and effectively preventing media leakage.

[0041] When the valve needs to be opened, rotate the valve shaft in the opposite direction to gradually move the butterfly plate 2 away from the retaining ring 4. Following the reverse order of the closing process, it disengages from the abutment groove 51 and the compression transition path 5 in sequence, and finally fully opens the valve to allow the medium to flow normally. Throughout the use process, the butterfly valve should be inspected and maintained regularly to check for wear, leakage, or other issues in the sealing structure. Damaged parts should be replaced in a timely manner to ensure the normal operation and service life of the butterfly valve.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve sealing structure, comprising a butterfly valve body (1) and a butterfly plate (2), wherein the inner wall of the butterfly valve body (1) is provided with a sealing sleeve (3), and the butterfly plate (2) has a rotation angle of 90°, characterized in that: The butterfly plate (2) in its closed state contacts the retaining dam protrusion (4) inside the sealing sleeve (3). There are two retaining dam protrusions (4), and they correspond to the sealing rotating end of the butterfly plate (2) respectively. The inner side of the sealing sleeve (3) is provided with extrusion transition paths (5) on the rotation path of the retaining dam protrusion ring (4) and the butterfly plate (2). The extrusion transition paths (5) are designed in multiple segments, which increase in height from the outside towards the retaining dam protrusion ring (4).

2. The butterfly valve sealing structure according to claim 1, characterized in that: The butterfly plate (2) is installed inside the butterfly valve body (1), and a valve shaft is provided on the center line to rotate inside the butterfly valve body (1).

3. The butterfly valve sealing structure according to claim 1, characterized in that: The retaining ring (4) and the sealing sleeve (3) are provided with a reinforcing ring (31), and the cross section of the reinforcing ring (31) is cross-shaped.

4. The butterfly valve sealing structure according to claim 3, characterized in that: The surface of the retaining bulge (4) corresponding to the sealing rotating end of the butterfly plate (2) is a plane. When the butterfly plate (2) is in the closed state, it is parallel to the short side of the reinforcing ring (31) and fits against the retaining bulge (4).

5. The butterfly valve sealing structure according to claim 1, characterized in that: The number of extrusion transition paths (5) is no less than three, and each segment is designed with an arc at the joint. The innermost segment of the extrusion transition path (5) is provided with an abutment embedding groove (51).

6. The butterfly valve sealing structure according to claim 1, characterized in that: The extrusion transition path (5) is semi-circular and fits into one side of the butterfly plate (2).

7. The butterfly valve sealing structure according to claim 1, characterized in that: The butterfly plate (2) has an arc-shaped surface (21) at each end, and the arc of the surface facing the dam convex ring (4) is greater than that of the arc-shaped surface (21) at the other end.

8. The butterfly valve sealing structure according to claim 7, characterized in that: A rubber sleeve (22) is provided on the arc-shaped surface (21) facing the end of the retaining dam protrusion (4).

Images