An energy-saving butterfly valve

Abstract

The present invention proposes an energy-saving butterfly valve, which relates to the technical field of butterfly valves. The energy-saving butterfly valve includes: a valve body and a valve plate. The inner surface of the valve body is provided with a curved area located in the center and a flat area located on both sides of the center; the thickness of the curved area gradually and continuously increases from the center of the valve body to both sides. The valve plate includes a valve plate body and a sealing structure directly provided on the valve plate body. The sealing structure is composed of at least three sealing elements. The highest points of at least three sealing elements are connected to form a peripheral sealing surface. The height of at least three sealing elements gradually decreases from the middle to both sides. The formed sealing structure is an axially symmetrical structure with a high middle area and a low peripheral area. The peripheral sealing surface is adapted to the curved area of ​​the valve body. The present invention cooperates with the valve plate through a curved valve body with a high middle area and low sides. When the fluid pressure is too large, the sealing performance of the valve plate is 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.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, and in particular to an energy-saving butterfly valve. Background Art

[0002] Valves are common control components in pipeline fluid delivery systems, which play the role of opening and closing, controlling flow direction, and adjusting the parameters of the conveying medium. The valve mainly includes a valve body, a valve seat, a valve core, and a drive assembly. The valve seat is set inside the valve body to support the fully closed position of the valve core and form a sealing pair. The drive assembly is used to control the opening and closing of the valve core. Common valve types include ball valves, butterfly valves, diaphragm valves, gate valves, check valves, etc. Among them, the butterfly valve, that is, the valve core is a circular butterfly plate, which is opened and closed by rotating with the valve stem as the axis.

[0003] The most important technical performance indicator of a valve is its sealing performance, which 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 an ordinary butterfly valve is generally a one-way sealing structure, which has a sealing effect when under positive pressure, but is prone to medium leakage when under reverse pressure.

[0004] At present, butterfly valves are used to adjust flow, cut off or connect fluids in pipelines with different media. They are mainly composed of valve plate assembly, valve body assembly and bottom cover assembly. The seal between the sealing surface of the valve plate and the valve seat is achieved by the torque of the transmission device to press the valve plate against the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal is squeezed. When the flow channel medium flows in reverse, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the seal begins to leak. Due to the limitation of structural conditions, this structure is not suitable for valves with a diameter below DN100, because the overall structure of the valve plate is too thick and the flow resistance is large.

[0005] In summary, the current centerline fire butterfly valve has certain defects in the design of the sealing pair of the valve plate and valve body. The main problem is that the sealing interference design of the valve plate rubber is large, which causes the valve plate to have a short life. The existing butterfly valve has high production costs. The traditional butterfly valve only uses one sealing element to achieve sealing. Once the seal interface is worn, it will cause leakage. Under high pressure, if there is a slight displacement of the valve plate, it is also prone to leakage without compensation. Conventional independent rubber seals are easy to wear, difficult to maintain, have large opening torque, and require a large amount of rubber for the sealing structure. They take a long time to degrade and have poor environmental performance. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes an energy-saving butterfly valve, comprising: a valve body and a valve plate; the inner surface of the valve body is provided with a curved surface area located in the center and a flat surface area located on both sides of the center, the valve body has a virtual center plane, and the curved surface area is symmetrical about the virtual center plane of the valve body.

[0007] Furthermore, the thickness of the curved area gradually and continuously increases from the center of the valve body to both sides; the surface connection between the plane area and the curved area is a smooth transition or a section transition.

[0008] Furthermore, the valve plate includes a valve plate body and a sealing structure, the sealing structure includes a top sealing surface, a middle sealing surface and a bottom sealing surface; the valve body includes a top, a middle and a bottom; the top sealing surface and the middle sealing surface respectively cooperate with the top and the bottom of the curved surface area of ​​the valve body; the top sealing surface and the bottom sealing surface refer to areas that are respectively sealed with the top and the bottom of the valve body when the valve plate is open or closed, and the middle sealing surface refers to an area that is sealed with the middle of the curved surface area when the valve plate is closed.

[0009] Furthermore, a plurality of sealing rings are arranged along the axial direction on the outer periphery of the valve plate body, and the sealing structure is formed by the plurality of sealing rings. When the cross section of the valve plate body is viewed along the radial direction of the valve plate body, the highest point connection line of the plurality of sealing rings forms an outer peripheral sealing surface of the sealing structure, and the outer peripheral sealing surface matches the curved surface area of ​​the valve body.

[0010] 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 sealing structure is composed of the multiple sealing rings, the first sealing layer and the second sealing layer.

[0011] Furthermore, on the cross section of the valve plate, the distance between the sealing ring and the central axis of the valve plate is the height of the sealing ring. When the number of the sealing rings is an odd number, the sealing ring in the middle has the highest height. The heights of the plurality of sealing rings gradually decrease from the middle to both sides. The sealing structure formed by the plurality of sealing rings is a petal shape with a high middle area and a low peripheral area. The highest points of the plurality of sealing rings are connected to form a peripheral sealing surface of the sealing structure, and the peripheral sealing surface cooperates with the curved area of ​​the valve body.

[0012] Furthermore, on the cross section of the valve plate, the distance between the sealing ring and the central axis of the valve plate is the height of the sealing ring. When the number of the sealing rings is an even number, the two sealing rings in the middle have the highest height. The heights of the multiple sealing rings gradually decrease from the middle to both sides. The sealing structure formed by the multiple sealing rings is a petal shape with a high middle area and a low peripheral area. The highest points of the multiple sealing rings form a peripheral sealing surface of the sealing structure, and the peripheral sealing surface cooperates with the curved area of ​​the valve body.

[0013] Furthermore, the first sealing layer, the second sealing layer and the plurality of sealing rings are completed by coating the sealing material at one time.

[0014] In addition, the sealing elements of the sealing structure can also be embedded in the grooves. The outer periphery of the valve plate body is provided with multiple grooves along the axial direction, and the sealing material is arranged on the grooves to form multiple sealing rings. The multiple sealing rings form a sealing structure. The radial height of the multiple sealing rings is higher than the height of the grooves and protrudes outward from the outer peripheral surface of the valve plate body. In the cross-section of the valve plate body along the radial direction of the valve plate body, the highest point line of the multiple sealing rings forms the outer peripheral sealing surface of the sealing structure, and the outer peripheral sealing surface cooperates with the curved surface area of ​​the valve body.

[0015] 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 sealing structure is composed of the multiple sealing rings, the first sealing layer and the second sealing layer.

[0016] Furthermore, on the cross section of the valve plate, the distance between the sealing ring and the central axis of the valve plate is the height of the sealing ring. When the number of the sealing rings is an odd number, the sealing ring in the middle has the highest height. The heights of the multiple sealing rings gradually decrease from the middle to both sides, and the line connecting the highest points of the multiple sealing rings forms the peripheral sealing surface of the sealing structure. The sealing structure formed by the multiple sealing rings is an axially symmetrical structure with a high middle area and a low peripheral area.

[0017] Furthermore, on the cross section of the valve plate, the distance between the sealing ring and the central axis of the valve plate is the height of the sealing ring. When the number of the sealing rings is an even number, the two sealing rings in the middle have the highest height. The heights of the multiple sealing rings gradually decrease from the middle to both sides. The line connecting the highest points of the multiple sealing rings forms the peripheral sealing surface of the sealing structure. The sealing structure formed by the multiple sealing rings is an axially symmetrical structure with a high middle area and a low peripheral area.

[0018] Furthermore, the peripheral sealing surface of the sealing structure and the curved surface area of ​​the valve body are set to different shapes, curvatures and sizes according to the valve caliber size, fluid pressure and fluid medium type.

[0019] Furthermore, the depths of the plurality of grooves are the same, and the contour of the top connecting line of the plurality of grooves is consistent with the contour of the curved surface area of ​​the valve body.

[0020] Furthermore, the width, depth and shape of the groove are selected according to the caliber size of the valve, the fluid pressure and the type of fluid medium.

[0021] Furthermore, the groove is wide inside and narrow outside.

[0022] Furthermore, the outer contour of the valve plate body is circular and is directly formed through one-time processing.

[0023] Furthermore, the number of the sealing rings or sealing rings is adjusted according to the caliber size of the valve, the fluid pressure and the type of fluid medium.

[0024] Furthermore, the peripheral sealing surface of the sealing structure and the curved surface area of ​​the valve body are set to different shapes, curvatures and sizes according to the valve caliber size, fluid pressure and fluid medium type.

[0025] Furthermore, the surface connection between the plane area and the curved area of ​​the valve body is a cross-sectional transition, and the cross-section is processed into a chamfer, and the type and degree of the chamfer are selected according to needs.

[0026] Furthermore, the surface of the curved area of ​​the valve body is treated to change its physical and mechanical properties.

[0027] Furthermore, the surface treatment method of the curved surface area of ​​the valve body is roughening treatment.

[0028] Furthermore, a fluid passage penetrating the valve body is provided inside the valve body, and the upper side of the outer side of the valve body is provided with an upper shaft cylinder for the upper valve stem to be inserted therethrough, and the lower side is provided with a lower shaft cylinder for the lower valve stem to be inserted therethrough.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] 1. The interior of the existing butterfly valve is a flat structure. When the valve is closed, the fluid pressure on both sides will impact the sealing structure. After long-term use, the rubber will be worn and the sealing performance will be poor. The center of the valve body of the present invention is a curved structure. A corresponding curved sealing structure is arranged 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 structure is adopted to compensate for the sealing performance during the movement of the valve plate. Within a certain range, the greater the pressure, the tighter the seal, and the compensation is bidirectional.

[0031] 2. The traditional butterfly valve body is entirely covered with rubber. The present invention eliminates the traditional soft sealing valve seat structure on the inner wall of the valve body, simplifies the structure and saves costs. There is no friction between the butterfly plate and the valve seat sealing surface on the valve body during opening and closing, which reduces the wear of the sealing pair and improves the sealing performance.

[0032] 3. The existing central butterfly valves all have a thicker sealing rubber ring. The present invention directly sets a sealing structure on the circumferential surface of the butterfly plate of the butterfly valve, and does not need to set an additional rubber sealing ring. Therefore, the amount of rubber used in the sealing structure of the present application is greatly reduced compared with the prior art. 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.

[0033] 4. The sealing structure is provided with multiple sealing elements along the axial direction to improve the sealing performance. When a sealing element is worn, other sealing elements can be replaced to improve the reliability of the seal. If one of the sealing strips is worn, it can be removed and replaced separately, avoiding the need to replace the entire large sealing ring in the prior art. The sealing materials required for maintenance can be saved during the entire life cycle, further reducing costs.

[0034] 5. The valve plate structure of the butterfly valve is optimized to reduce resistance. When the valve plate is in the open state, the thickness of the valve plate can easily affect the flow of the fluid and create resistance to the fluid. In order to reduce the impact of the valve plate on the flow of the fluid, the resistance is reduced by improving the structural characteristics of the valve plate. The sealant adopts a multi-pass sealing method. Compared with the surface sealing of the entire valve plate in the prior art, the contact area becomes smaller and the friction is reduced. The driving power can be reduced during the switching process, and the torque during use is also reduced, achieving the technical effect of energy saving.

[0035] 6. The outer contour of the valve plate body is circular, which is directly formed through one-time processing. 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 surface 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, and the processing cost is reduced. For large-sized valves, grooves and protrusions are processed on the valve plate, and sealants are set in the grooves. The shape of the grooves is wide inside and narrow outside to prevent the sealants from flowing out or falling off; multi-channel sealing can buffer the impact of the fluid on the valve plate and extend the service life. Under the premise of ensuring the sealing performance, the specific shape of the groove can be adaptively set to reduce the deposition of impurities in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0037] Attached Figure 1 A front view of an energy-saving butterfly valve embodiment 1 of the present invention;

[0038] Attached Figure 2A three-dimensional diagram of an energy-saving butterfly valve embodiment 1 of the present invention;

[0039] Attached Figure 3 A cross-sectional view of an energy-saving butterfly valve embodiment 1 of the present invention;

[0040] Attached Figure 4 A cross-sectional view of an energy-saving butterfly valve embodiment 1 of the present invention;

[0041] Attached Figure 5 A front view of a valve plate of an energy-saving butterfly valve embodiment 1 of the present invention;

[0042] Attached Figure 6 A side view of the valve plate of the energy-saving butterfly valve embodiment 1 of the present invention;

[0043] Attached Figure 7 A partial enlarged view of the rubber coating of the valve plate of the energy-saving butterfly valve embodiment 1 of the present invention;

[0044] Attached Figure 8 A cross-sectional view of a valve plate of an energy-saving butterfly valve embodiment 1 of the present invention having a sealing layer;

[0045] Attached Fig. 9 A three-dimensional cross-sectional view of a valve plate of an energy-saving butterfly valve embodiment 1 of the present invention having a sealing layer;

[0046] Attached Fig.10 A schematic diagram showing that the number of sealing rings on the valve plate of the energy-saving butterfly valve embodiment 1 of the present invention is an odd number;

[0047] Attached Fig.11 A schematic diagram showing that the number of sealing rings on the valve plate of the energy-saving butterfly valve embodiment 1 of the present invention is an even number;

[0048] Attached Fig.12 A three-dimensional view of a valve plate with grooves in Example 2 of the energy-saving butterfly valve of the present invention;

[0049] Attached Fig.13 A cross-sectional view of a valve body and valve plate having a groove is shown in Example 2 of the energy-saving butterfly valve of the present invention;

[0050] Attached Fig.14 A schematic diagram showing that the number of sealing rings on the valve plate of the energy-saving butterfly valve embodiment 2 of the present invention is an odd number;

[0051] Attached Fig.15 A schematic diagram showing that the number of sealing rings on the valve plate of the energy-saving butterfly valve embodiment 2 of the present invention is an even number;

[0052] Attached Fig.16 The shape of the groove on the valve plate of the energy-saving butterfly valve embodiment 2 of the present invention;

[0053] Attached Fig.17Schematic diagram of the segmented curvature change of the curved surface area of ​​the energy-saving butterfly valve of the present invention in different application scenarios. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] 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 cannot constitute a limitation on the signal transmission direction, connection sequence and size, dimensions and shape of the components or structures.

[0056] like Figure 1 1 is a front view of an energy-saving butterfly valve embodiment 1 of the present invention. The energy-saving valve of the present invention comprises a valve body 1 and a valve plate 2, and the valve body 1 and the valve plate 2 are used in combination.

[0057] The valve body is the core part of the energy-saving butterfly valve, which is used to control the flow of fluid and is arranged at the center of the flow path inside the pipeline. A fluid channel penetrating the valve body 1 is set inside the valve body 1, and an upper shaft cylinder is provided on the upper side of the outer side of the valve body 1 for the upper valve stem to be inserted through, and a lower shaft cylinder is provided on the lower side for the lower valve stem to be inserted through. The upper valve stem and the lower valve stem are rods connecting the valve drive device and the valve plate, and the upper valve stem and the lower valve stem can rotate freely to control the flow of fluid.

[0058] 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 3 gradually increases from the center of the valve body to both sides; the surface connection between the plane area and the curved area 3 can be a smooth transition or a section transition. Figure 3 Only the cross-sectional transition is shown; the interference mode in the prior art is reduced, the wear is reduced, and the life of the valve plate is increased.

[0059] 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 5As 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 match the top and bottom of the curved surface area 3 of the valve body, and the middle sealing surface 120 of the sealing structure 12 also matches the middle of the curved surface area 3 when the valve plate 2 is closed, and the middle refers to the valve plate sealing structure 12 or other areas of the curved surface area 3 except the top and the bottom.

[0060] Preferably, the valve plate body 11 can be directly formed into a circular outer contour through one-time processing, and its top and bottom do not need to be processed into flat surfaces according to the prior art. Direct forming through one-time processing can reduce processing steps and reduce costs.

[0061] like Figure 6 , Figure 7 As shown, a plurality of sealing rings 123 are arranged along the axial direction on the outer periphery of the valve plate body 11, and the number of sealing rings can be adjusted according to the valve caliber, pressure, working medium and other parameters, and the sealing structure is formed by the sealing rings. Viewed along the radial direction of the valve plate body 11, the highest point connection line of the plurality of sealing rings forms the outer peripheral sealing surface of the sealing structure, and the outer peripheral sealing surface matches the curved surface area 3 of the valve body, and the curvature change of the outer peripheral sealing surface is consistent with the curvature change of the curved surface area 3 of the valve body. For example, when the curved surface area 3 is spherical or ellipsoidal, the rotation radius of the valve plate is the same as the radius of the curved surface area 3, and no eccentric setting is required.

[0062] like Figure 6 , Figure 8 , Fig. 9 As shown, in addition to setting a sealing ring on the periphery of the valve plate body 11, the first outer surface 124 and the second outer surface 125 on both sides of the valve plate body 11 are also coated with sealing materials to form a first sealing layer 126 and a second sealing layer 127. In this case, the sealing structure 12 is composed of a plurality of sealing rings 123 and a first sealing layer 126 and a second sealing layer 127. By setting the sealing layer, the corrosion of the material by the fluid can be avoided, the surface of the valve plate can be protected, and the service life of the valve plate can be increased. The sealing layer and the sealing ring can be completed together through a one-time coating process, which reduces the processing steps and reduces the production cost.

[0063] like Fig.10 , Fig.11As shown, when the number of sealing rings 123 is an odd number, the sealing ring in the middle is the highest, and when the number of sealing rings 123 is an even number, the heights of 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 cross-section formed by the multiple sealing rings is a petal shape with a high middle area and a low peripheral area, so that the sealing surface formed by the sealing ring is adapted to the curved area 3, thereby improving the sealing effect. In order to ensure uniform force, the cross-section of the petal-shaped sealing structure is axisymmetric. Example

[0064] The arrangement of the curved surface area 3 and the flat surface area of ​​the valve body of Example 2 is the same as that of Example 1, and the difference from Example 1 is the difference in the sealing structure. For large-sized valves, if two sealing layers and a sealing ring are directly made on the valve plate through a one-time coating process, a lot of sealing materials are used, such as a large amount of rubber materials, which is not conducive to energy conservation and emission reduction, and the low-carbon environmental protection performance is insufficient. Therefore, the sealing structure can be adjusted according to the different valve sizes.

[0065] like Fig.12 As shown, the outer periphery of the valve plate body 11 is provided with grooves 111 with different numbers corresponding to different calibers, different pressures, and different working media along the axial direction. The grooves are directly processed and formed on the valve plate body 11. The sealing material is arranged on the grooves 111 to form a plurality of sealing rings 112, and the plurality of sealing rings 112 form a sealing structure. The radial height of the plurality of sealing rings 112 is higher than the height of the grooves, and they protrude outward from the outer peripheral surface of the valve plate body 11. The top sealing area 113 and the bottom sealing area 114 of the sealing area of ​​the valve plate are respectively matched with the top and bottom of the curved surface area 3 of the valve body, and the sealing materials of the two sealing areas can be arranged in a ring around the driving rod. The middle sealing area of ​​the sealing structure also matches with the middle of the curved surface area 3 when the valve plate is closed, wherein the top sealing area, the bottom sealing area and the middle sealing area are similar to the top sealing surface, the bottom sealing surface and the middle sealing surface in Example 1.

[0066] like Fig.13 As shown, along the radial direction of the valve plate body 11, the highest point line of the plurality of sealing rings 112 forms the peripheral sealing surface of the sealing structure, and the peripheral sealing surface matches the curved surface area 3 of the valve body. The peripheral interface of the sealing structure 12 and the curved surface area 3 of the valve body can have different shapes, curvatures, and sizes according to different calibers, different pressures, and different working media; the width and depth of the groove 111 can have different changes according to different calibers, different pressures, and different working media; the number of the plurality of sealing rings 112 can also change according to the valve body size of different calibers, different pressures, and different working media.

[0067] like Fig.14 , Fig.15 As shown, when the number of the multiple sealing rings 112 is an odd number, the sealing ring in the middle is the highest, and when the number of the multiple sealing rings 112 is an even number, the heights of the two sealing rings in the middle are the highest, and the heights of the multiple sealing rings gradually decrease from the middle to both sides. In order to ensure uniform force, the cross-section of the petal-shaped sealing structure is axisymmetric.

[0068] like Fig.16 As shown, the shape of the groove 111 is wide inside and narrow outside to prevent the sealant from flowing out or falling off. By reasonably setting the specific shape of the groove 111, the deposition of impurities in the groove 111 can be reduced.

[0069] This embodiment can be used not only for large size, but also for small size. It is the same as the first embodiment, except that the sealing ring is arranged on the periphery of the valve plate body 11, the first outer surface and the second outer surface on both sides of the valve plate body 11 are also coated with sealing material to form the first sealing layer and the second sealing layer. In this case, the sealing structure 12 is composed of a plurality of sealing rings 112, the first sealing layer and the second sealing layer. By setting the sealing layer, the corrosion of the material by the fluid can be avoided, the surface of the valve plate can be protected, and the service life of the valve plate can be increased. The sealing layer and the sealing ring can be completed together through a one-time coating process, which reduces the processing steps and reduces the production cost.

[0070] Preferably, for small sizes, the sealing structure can be set as a circumferential petal-shaped sealing ring and a surface sealing layer, the middle sealing ring of the petal-shaped sealing ring is high, and the sealing rings on both sides are low; for large sizes, grooves and raised sealing ring structures can be directly processed on the valve plate, and sealant is arranged in the groove. Multi-pass sealing can buffer the impact of the fluid on the valve plate and extend the service life. Under the premise of ensuring the sealing performance, the use of sealant is reduced and the cost is reduced; during the opening and closing process, there is no friction between the sealing structure on the valve plate body and the curved surface area 3 of the valve body, so that the sealing pair has little wear and tear and good sealing performance.

[0071] Furthermore, as attached Fig.10 , 11 As shown in , 14 and 15, when the surface connection between the plane area and the curved surface area 3 is a smooth transition or a section transition. When the section transition is adopted, a chamfer can be made at the section, and the type and degree of the chamfer can be selected according to actual needs. When the valve plate rotates into the curved surface area 3 of the valve body, the chamfer setting can reduce the wear of the sealing element.

[0072] The curved area 3 is treated in different ways according to different calibers, different pressures, and different working media to change its physical and mechanical properties. For example, its surface can be roughened. The curvature of the curved area 3 can also be selected according to specific application scenarios and requirements, which can avoid the valve plate of the butterfly valve being eccentric due to water pressure for a long time, causing leakage.

[0073] The existing technology has the problem of leakage caused by displacement of the valve plate due to excessive fluid pressure. Therefore, the height of the sealing elements in the middle area of ​​the valve plate needs to be higher than those in the two side areas, and the peripheral sealing surface formed by the high point connection line of each sealing element needs to be adapted to the curved area 3 of the valve body. In other words, the curvature change of the peripheral sealing surface is consistent with the curvature change of the curved area 3 of the valve body. For example, when the curved area 3 is spherical or ellipsoidal, the rotation radius of the valve plate is the same as the radius of the curved area 3, and an eccentric setting is not required. Especially when the pressure is high, the curvature of the curved area 3 should be large, so that there is a greater thickness difference between the middle and the two sides, making the compensation effect more obvious. Further, if Fig.17 As shown, in the optimized design, the valve body curved surface area 3 can be divided into multiple sections, the curvature of the middle section is small, and the curvature of the peripheral section is large, such as Fig.17 As shown, taking the structure divided into three sections as an example, curvatures 2 and 3 are greater than curvature 1, and curvature 2 and curvature 3 can be equal to form a symmetrical structure. In some specific application scenarios, such as when the pressure on one side of the fluid is significantly greater than that on the other side, curvature 2 and curvature 3 can also be unequal, so that the side with higher pressure can get better sealing compensation.

[0074] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by 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 more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An energy-saving butterfly valve, comprising a valve body and a valve plate, characterized in that: The inner surface of the valve body is provided with a curved surface area located at the center of the valve body and flat surface areas located on both sides of the center, and the thickness of the curved surface area gradually and continuously increases from the center of the valve body to both sides; the valve plate includes a valve plate body and a sealing structure, and the sealing structure is composed of at least three sealing elements, and the highest point connection line of the at least three sealing elements forms an outer peripheral sealing surface; on the cross section of the valve plate, the distance between the at least three sealing elements and the central axis of the valve plate is the height of the sealing element, the middle area of ​​the sealing structure is high and the peripheral area is low, and the outer peripheral sealing surface is adapted to the curved surface area of ​​the valve body; the sealing element is arranged axially on the periphery of the valve plate body; The sealing element is a sealing ring directly coated on the valve plate body; or, The sealing element is a sealing ring directly arranged on the groove of the valve plate body. The sealing ring is formed by arranging a sealing material on the groove. The height of the sealing ring in the radial direction is higher than the height of the groove and protrudes outward from the outer peripheral surface of the valve plate body. The curved surface area is divided into at least three areas, wherein the curvature of the middle area is the smallest and the curvature of the outer areas gradually increases from the middle.

2. The energy-saving butterfly valve according to claim 1 is characterized in that: The surface connection between the plane area and the curved area is a smooth transition or a section transition.

3. The energy-saving butterfly valve according to claim 1 is characterized in that: The sealing structure includes a top sealing surface, a middle sealing surface and a bottom sealing surface; 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; the top sealing surface and the bottom sealing surface refer to areas that are respectively sealed with the top and the bottom of the valve body when the valve plate is open or closed, and the middle sealing surface refers to an area that is sealed with the middle of the curved surface area when the valve plate is closed.

4. The energy-saving butterfly valve according to claim 1 is 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 sealing structure includes the first sealing layer and the second sealing layer.

5. The energy-saving butterfly valve according to claim 1 is characterized in that: When the number of the sealing elements is an odd number, the sealing element located in the middle has the highest height.

6. The energy-saving butterfly valve according to claim 1, characterized in that: When the number of the sealing elements is an even number, the two sealing elements in the middle have the highest height.

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

8. The energy-saving butterfly valve according to claim 1, characterized in that: The outer contour of the valve plate body is circular and is directly formed through one-time processing.

9. The energy-saving butterfly valve according to claim 4, characterized in that: When the sealing element is a sealing ring, the first sealing layer, the second sealing layer and the plurality of sealing rings are processed by coating the sealing material once; when the sealing element is a sealing ring, the first sealing layer and the second sealing layer are processed by coating the sealing material once.

10. The energy-saving butterfly valve according to claim 2, characterized in that: The surface connection between the plane area and the curved area of ​​the valve body is a section-type transition, and the section is processed into a chamfer.

11. The energy-saving butterfly valve according to claim 1, characterized in that: The surface of the curved area of ​​the valve body is treated to change its physical and mechanical properties.

12. The energy-saving butterfly valve according to claim 11, characterized in that: The surface treatment method of the curved surface area of ​​the valve body is roughening treatment.

13. The energy-saving butterfly valve according to claim 1, characterized in that: The valve body is provided with a fluid passage penetrating the valve body inside, and the valve body is provided with an upper shaft cylinder through which an upper valve stem is inserted on the upper side and a lower shaft cylinder through which a lower valve stem is inserted on the lower side.

14. The energy-saving butterfly valve according to claim 1, characterized in that: The depths of the plurality of grooves are the same, and the contour of the top connecting line of the plurality of grooves is consistent with the contour of the curved surface area of ​​the valve body.

15. The energy-saving butterfly valve according to claim 1, characterized in that: The width, depth and shape of the groove are selected according to the caliber size of the valve, the fluid pressure and the type of fluid medium.

16. The energy-saving butterfly valve according to claim 1, characterized in that: The groove is in a shape of being wide inside and narrow outside.

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