Petal-shaped sealing structure of butterfly valve

Abstract

The utility model provides a petal-shaped sealing structure of a butterfly valve, and relates to the technical field of butterfly valve sealing, a plurality of sealing rings are arranged on the periphery of a valve plate body of the butterfly valve along the axial direction, the petal-shaped sealing structure is formed by the plurality of sealing rings, and when the cross section of the valve plate body is seen along the radial direction of the valve plate body, the petal-shaped sealing structure is formed by the plurality of sealing rings. A peripheral sealing face of the sealing structure is formed by connecting lines of the highest points of the multiple sealing rings, and the peripheral sealing face of the petal-shaped sealing structure is matched with a curved face area of a valve body of the butterfly valve. According to the petal-shaped sealing structure, the valve plate can be opened and closed more smoothly, the driving power is reduced, the torque is reduced, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valve sealing, in particular to a petal-shaped sealing structure of a butterfly valve. Background Art

[0002] Valves are common control components in pipeline fluid delivery systems, serving to open and close, control flow direction, and adjust parameters of the conveyed medium. Valves primarily consist of a valve body, valve seat, valve core, and actuator. The valve seat, located within the valve body, supports the valve core in the fully closed position and forms a sealing element. The actuator controls the opening and closing of the valve core. Common valve types include ball valves, butterfly valves, diaphragm valves, gate valves, and check valves. Butterfly valves, for example, have a circular disc as the valve core, which rotates about the valve stem to open and close.

[0003] The most important technical performance indicator of a valve is sealing performance. Sealing performance refers to the ability of each sealing part of the valve to prevent leakage of the medium. The contact between the valve seat and the valve core is one of the sealing parts of the valve. The contact between the valve seat and the valve core of a conventional butterfly valve is generally a one-way sealing structure. This seals under positive pressure, but is prone to medium leakage under negative pressure.

[0004] Currently, butterfly valves are used in pipelines with different media to regulate flow, shut off, or connect fluids. They primarily consist of a valve plate assembly, a valve body assembly, and a bottom cover assembly. The seal between the valve plate's sealing surface and the valve seat is achieved by the torque of a transmission device, which presses the valve plate against the seat. During positive flow, the higher the medium pressure, the tighter the seal. However, when the unit positive pressure between the valve plate and the seat decreases below the medium pressure during reverse flow, the seal begins to leak. Due to structural limitations, this design is not suitable for valves with a diameter below DN100 because the overall thickness of the valve plate creates a high flow resistance.

[0005] In summary, current butterfly valves have certain flaws in the design of the seal between the valve disc and the valve body. The main flaw is the large interference fit of the valve disc rubber, which results in a short valve disc life. Existing butterfly valves are expensive to produce, difficult to repair leaks, prone to wear in the seal structure, require high opening torque, require a large amount of rubber, which takes a long time to degrade, and have poor environmental performance. Utility Model Content

[0006] In order to solve the above technical problems, the present invention proposes a petal-shaped sealing structure of a butterfly valve, which is characterized in that: a plurality of sealing rings are arranged along the axial direction on the outer periphery of the valve plate body of the butterfly valve, and the plurality of sealing rings form a petal-shaped sealing structure, and the line connecting the highest points of the plurality of sealing rings forms the peripheral sealing surface of the sealing structure, and the peripheral sealing surface of the petal-shaped sealing structure cooperates with the curved surface area of the valve body of the butterfly valve.

[0007] Furthermore, the petal-shaped sealing structure includes a top sealing surface, a middle sealing surface and a bottom sealing surface; the curved surface area of the valve body includes a top, a middle and a bottom; the top sealing surface, the middle sealing surface and the bottom sealing surface respectively cooperate with the top, the middle and the bottom of the curved surface area of the valve body.

[0008] Furthermore, the first outer surface and the second outer surface on both sides of the valve plate body are respectively coated with sealing materials to form a first sealing layer and a second sealing layer, and the petal-shaped sealing structure includes the first sealing layer and the second sealing layer.

[0009] Furthermore, the distance between the sealing ring and the central axis of the valve plate is the height of the sealing ring. The multiple sealing rings form a petal-shaped sealing ring, the sealing ring in the middle area of the petal-shaped sealing ring is higher, and the sealing ring in the peripheral area is lower.

[0010] Furthermore, when the number of the multiple sealing rings is an odd number, the sealing ring in the middle is the highest; the heights of the multiple sealing rings gradually decrease from the middle to both sides, and the sealing structure formed by the multiple sealing rings is an axially symmetrical petal-shaped structure with a high middle area and a low peripheral area.

[0011] Furthermore, when the number of the multiple sealing rings is an even number, the two sealing rings in the middle are the highest; the heights of the multiple sealing rings gradually decrease from the middle to both sides, and the sealing structure formed by the multiple sealing rings is an axially symmetrical petal-shaped structure with a high middle area and a low peripheral area.

[0012] Furthermore, the peripheral sealing surface of the petal-shaped sealing structure and the curved surface area of the valve body are set to have corresponding curved surface area shapes, curvatures and sizes according to the butterfly valve caliber size, fluid pressure and fluid medium type.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] 1. The center of the valve body of the utility model is a curved surface structure. A corresponding curved surface sealing structure is set on the valve plate. When the valve plate is closed, the impact force of the fluid will cause the valve plate to move to both sides. Compared with the flat structure, the curved surface structure makes the sealing performance of the valve plate compensated during the movement of the valve plate. Within a certain range, the greater the pressure, the tighter the seal, and the compensation is bidirectional.

[0015] 2. While conventional butterfly valves have an entire body covered in rubber, this new design eliminates the traditional soft-seal seat structure on the inner wall of the valve body, simplifying the structure and saving costs. During opening and closing, there is no friction between the butterfly plate and the valve seat sealing surface on the valve body, resulting in minimal wear on the seal pair and improved sealing performance.

[0016] 3. Existing butterfly valves all have a thicker sealing rubber ring. The utility model directly sets a sealing structure on the circumferential surface of the valve plate of the butterfly valve, and does not require an additional rubber sealing ring. Therefore, the amount of rubber used in the sealing structure of this application is greatly reduced compared with the existing technology. Rubber is difficult to degrade in the natural environment. Reducing the use of rubber can improve the environmental performance of the valve itself and reduce the cost of raw materials.

[0017] 4. The sealing structure features multiple sealing elements along the axial direction, improving sealing performance. When one sealing element wears out, another can replace it, enhancing sealing reliability. If a single sealing strip becomes worn, it can be removed and replaced individually, eliminating the need to replace the entire large sealing ring as in existing technology. This reduces sealing material maintenance throughout the lifecycle, further reducing costs.

[0018] 5. The sealant adopts a multi-line sealing method. Compared with the surface sealing of the entire valve plate in the existing technology, the contact area is smaller and the friction is reduced. The driving power can be reduced during the switching process. At the same time, the torque during use is also reduced, achieving the technical effect of energy saving.

[0019] 6. For small-sized valves, a petal-shaped sealant structure is used. The petals are high in the middle and low on both sides. The outer contour of the sealing structure matches the curved area of the valve body. The sealing layers on both sides and multiple sealing rings on the periphery are completed through one-time processing. The process is simple and convenient, reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Attachment Figure 1 A front view of a butterfly valve in which the petal-shaped sealing structure of the present invention is located;

[0022] Attachment Figure 2 A three-dimensional diagram of a butterfly valve in which the petal-shaped sealing structure of the utility model is located;

[0023] Attachment Figure 3 A cross-sectional view of a butterfly valve in which the petal-shaped sealing structure of the present invention is located;

[0024] Attachment Figure 4 A cross-sectional view of a butterfly valve in which the petal-shaped sealing structure of the utility model is located;

[0025] Attachment Figure 5 A front view of the valve plate where the petal-shaped sealing structure of the utility model is located;

[0026] Attachment Figure 6 A side view of the valve plate where the petal-shaped sealing structure of the utility model is located;

[0027] Attachment Figure 7 A partial enlarged view of the petal-shaped sealing structure of the utility model at the glue coating portion;

[0028] Attachment Figure 8 A cross-sectional view of the sealing layer of the petal-shaped sealing structure of the utility model;

[0029] Attachment Figure 9 A three-dimensional cross-sectional view of the sealing layer of the petal-shaped sealing structure of the utility model;

[0030] Attachment Figure 10 A schematic diagram showing an odd number of sealing rings in the petal-shaped sealing structure of the present invention;

[0031] Attachment Figure 11 A schematic diagram showing that the number of sealing rings of the petal-shaped sealing structure of the present invention is an even number. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In the drawings of the specific embodiments of the present invention, in order to better and more clearly describe the working principles of the various components in the system, the connection relationship of the various parts in the device is shown, which only clearly distinguishes the relative position relationship between the various components, and does not constitute a limitation on the signal transmission direction, connection sequence and size, dimension and shape of the components or structures.

[0034] like Figure 1 The figure shows a front view of a butterfly valve to which the groove type sealing structure of embodiment 1 of the present invention is applied. The butterfly valve comprises a valve body 1 and a valve plate 2, which are used in conjunction with each other.

[0035] The valve body is the core component of a butterfly valve, used to control fluid flow and positioned at the center of the flow path within a pipeline. A fluid passageway penetrates the valve body 1. An upper shaft cylinder, through which the upper valve stem is inserted, is located on the upper side of the valve body 1, while a lower shaft cylinder, through which the lower valve stem is inserted, is located on the lower side. The upper and lower valve stems connect the valve actuator and the valve plate, allowing them to rotate freely to control fluid flow.

[0036] like Figure 2 As shown, the inner surface of the valve body is provided with a curved area 3 located in the center and flat areas 4 located on both sides of the center. Figure 3 As shown, the valve body has a virtual center plane 5, and the curved area 3 is symmetrical about the virtual center plane 5 of the valve body 1. The thickness of the curved area gradually increases from the center of the valve body to both sides; the surface connection between the flat area and the curved area can be a smooth transition or a section transition. Figure 3 Only the cross-sectional transition is shown; the interference fit in the prior art is reduced, wear is reduced, and the life of the valve plate is increased.

[0037] like Figure 4 As shown, the valve plate includes a valve plate body 11 and a sealing structure 12 directly disposed on the valve plate body 11. Figure 5 As shown, the valve plate 2 includes a valve plate body 11 and a sealing structure 12 directly disposed on the valve plate body 11. The top sealing surface 121 and the bottom sealing surface 122 of the sealing structure 12 respectively cooperate with the top and bottom of the curved surface area 3 of the valve body. When the valve plate 2 is closed, the middle sealing surface 120 of the sealing structure 12 also cooperates with the middle of the curved surface area 3. The middle refers to the valve plate sealing structure 12 or the other area of the curved surface area 3 except the top and bottom.

[0038] like Figure 6 、 7 As shown, multiple sealing rings 123 are axially disposed on the outer periphery of the valve plate body 11. The number of sealing rings can be adjusted based on parameters such as the valve diameter, pressure, and operating medium. The sealing rings form a sealing structure. Viewed radially from the valve plate body 11, the line connecting the highest points of the multiple sealing rings forms the outer peripheral sealing surface of the sealing structure, which mates with the curved surface of the valve body.

[0039] like Figure 6 、 8 As shown in Figures 9 and 9, in addition to providing sealing rings around the periphery of the valve plate body 11, the first and second outer surfaces 124 and 125 of the valve plate body 11 are also coated with a sealing material to form a first sealing layer 126 and a second sealing layer 127. In this case, the sealing structure 12 comprises multiple sealing rings 123 and two sealing layers 126 and 127. The provision of the sealing layers prevents fluid corrosion on the material, protects the surface of the valve plate, and extends the service life of the valve plate. The sealing layers and sealing rings can be applied together in a single coating process, reducing processing steps and lowering production costs.

[0040] like Figure 10 、 Figure 11As shown, when the number of sealing rings 123 is odd, the sealing ring in the middle is the tallest. When the number of sealing rings 123 is even, the two sealing rings in the middle are the tallest. The heights of the multiple sealing rings gradually decrease from the center to the sides. The cross-section formed by the multiple sealing rings is a petal-shaped structure with a high center area and low outer areas. This allows the sealing surface formed by the sealing rings to adapt to the curved area, improving the sealing effect. To ensure uniform force, the cross-section of the petal-shaped sealing structure is axisymmetric.

[0041] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A petal-shaped sealing structure of a butterfly valve, characterized by: A plurality of sealing rings are arranged axially on the outer periphery of the valve plate body of the butterfly valve, and the plurality of sealing rings form a petal-shaped sealing structure. The line connecting the highest points of the plurality of sealing rings forms the peripheral sealing surface of the sealing structure, and the peripheral sealing surface of the petal-shaped sealing structure cooperates with the curved surface area of the valve body of the butterfly valve.

2. The petal-shaped sealing structure of a butterfly valve according to claim 1, characterized in that: The petal-shaped sealing structure includes a top sealing surface, a middle sealing surface and a bottom sealing surface; the curved surface area of the valve body includes a top, a middle and a bottom; the top sealing surface, the middle sealing surface and the bottom sealing surface respectively cooperate with the top, the middle and the bottom of the curved surface area of the valve body.

3. The petal-shaped sealing structure of a butterfly valve according to claim 1, characterized in that: The first outer surface and the second outer surface on both sides of the valve plate body are respectively coated with sealing materials to form a first sealing layer and a second sealing layer. The petal-shaped sealing structure includes the first sealing layer and the second sealing layer.

4. The petal-shaped sealing structure of a butterfly valve according to claim 3, characterized in that: The distance between the sealing ring and the central axis of the valve plate is the height of the sealing ring. The multiple sealing rings form a petal-shaped sealing ring. The sealing ring in the middle area of the petal-shaped sealing ring is high, and the sealing ring in the peripheral area is low.

5. The petal-shaped sealing structure of a butterfly valve according to claim 4, characterized in that: When the number of the multiple sealing rings is an odd number, the sealing ring in the middle is the highest; the heights of the multiple sealing rings gradually decrease from the middle to both sides, and the sealing structure formed by the multiple sealing rings is an axially symmetrical petal shape with a high middle area and a low peripheral area.

6. The petal-shaped sealing structure of a butterfly valve according to claim 4, characterized in that: When the number of the multiple sealing rings is an even number, the two sealing rings in the middle are the highest; the heights of the multiple sealing rings gradually decrease from the middle to both sides, and the sealing structure formed by the multiple sealing rings is an axially symmetrical petal shape with a high middle area and a low peripheral area.

7. The petal-shaped sealing structure of a butterfly valve according to claim 1, characterized in that: The peripheral sealing surface of the petal-shaped sealing structure and the curved surface area of the valve body are set with corresponding curved surface area shapes, curvatures and sizes according to the butterfly valve caliber size, fluid pressure and fluid medium type.

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