High-sealing-performance double-blade butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, in particular to a high-sealing-performance double-blade butterfly valve which comprises a valve seat and two valve shafts, a driving motor is arranged on the valve seat, the number of the valve shafts is two, the two valve shafts are symmetrically and rotationally connected to the valve seat along the axis, valve plates are fixedly connected to the two valve shafts, the output end of the driving motor is connected with the valve shafts, and the output end of the driving motor is connected with the valve shafts. The buffer assembly is arranged in the valve seat, when the driving motor drives the valve plate to be closed through the valve shaft, the buffer assembly can apply pressure to the first buffer gear to slow down the rotating speed of the first buffer gear, and then the closing speed of the valve plate is slowed down; by means of the design, the problem that in the closing process of the valve plate, the closing speed of the butterfly valve is increased due to the pressure, acting on the valve plate, of a medium, and then the valve plate and the valve seat collide and are abraded or even damaged is solved.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, in particular to a high-sealing double-leaf butterfly valve. Background Art

[0002] High-sealing double-leaf butterfly valve is a valve used to control the flow of materials into and out of pipelines. The main purpose of the high-sealing double-leaf butterfly valve is to cut off and throttle the pipeline. It uses two independently flipped leaves to achieve opening and closing. It is particularly suitable for controlling the flow of materials in and out. It uses a cylinder to push the connecting rod and is easy to operate. The double-leaf butterfly valve is widely used in grain, feed, flour, oil, chemical and metallurgical processes. It has the characteristics of decomposing pressure, not easy to leak and good sealing.

[0003] The valve plate of the closing part of the high-sealing double-leaf butterfly valve rotates around the valve shaft to achieve the open and closed states. Under normal circumstances, the valve plate in the high-sealing double-leaf butterfly valve is usually closed along the pressure direction of the medium. The main benefit of closing the butterfly valve along the pressure of the medium is to improve the sealing performance. When the medium flows forward, the medium pressure will act on the valve plate to make the valve plate and the valve seat fit better, thereby improving the sealing performance. However, when the valve plate is closed along the pressure direction of the medium, the pressure of the medium acting on the valve plate during the closing process will cause the butterfly valve to close faster, which will cause the valve plate and the valve seat to collide, causing the valve plate and the valve seat to wear or even damage, causing the high-sealing double-leaf butterfly valve to lose its sealing effect when closed.

[0004] In view of the above problems, the prior art provides some solutions. For example, patent application number: CN202220979283.9 provides a metal hard-sealed butterfly valve, including a valve body, wherein the valve body is rotatably connected to a valve shaft through multiple sets of sealing rings, the valve body is provided with a valve seat, the valve shaft is rotatably connected to the valve seat through a valve plate, and both ends of the valve plate close to the valve seat are slidably connected to a sealing plate, one end of the sealing plate is detachably connected to the valve plate through a telescopic rod, and the other end of the sealing plate is cooperatively connected to the valve seat. The utility model arranges a sealing plate. When the butterfly valve is rotating and switching, the sealing plate replaces the collision and friction between the hard metal materials in the process of opening and closing the valve, which not only effectively reduces the wear of parts during the valve switching process, but also increases the sealing of the valve during use. Although the design protects the valve by arranging a sealing plate, the sealing plate will also be worn or even damaged after long-term use, thereby reducing the sealing of the metal hard-sealed butterfly valve. Summary of the invention

[0005] The purpose of the present invention is to provide a high-sealing double-leaf butterfly valve to solve the problem that the pressure of the medium acting on the valve plate during the closing process of the valve plate will increase the closing speed of the butterfly valve, thereby causing the valve plate and the valve seat to collide, causing the valve plate and the valve seat to be worn or even damaged, resulting in the high-sealing double-leaf butterfly valve losing its sealing effect when closing.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Preferably, a high-sealing double-leaf butterfly valve comprises a valve seat and a valve shaft, wherein a driving motor is arranged on the valve seat, the valve shafts are 2 in number, the two valve shafts are symmetrically rotatable along the axis and connected to the valve seat, the two valve shafts are fixedly connected with valve plates, the output end of the driving motor is connected to the valve shaft, the two valve shafts are fixedly connected with linkage gears, the two linkage gears are meshed with each other, a buffer assembly having a buffer gear 1 is also arranged inside the valve seat, the buffer gear 1 is fixedly connected to the valve shaft, and when the buffer gear 1 follows the valve shaft to rotate in the direction of closing the valve plate, the buffer assembly applies pressure to the buffer gear 1.

[0008] It is easy to understand that the design arranges a buffer assembly with a buffer gear 1 inside the valve seat. When the driving motor drives the valve plate to close through the valve shaft, since the buffer gear 1 is fixedly connected to the valve shaft, the buffer gear 1 will rotate together with the valve shaft during the closing process of the valve plate. At this time, the buffer assembly will apply pressure to the buffer gear 1 to slow down the rotation speed of the buffer gear 1, thereby slowing down the closing speed of the valve plate. Therefore, the design avoids the problem that the pressure of the medium acting on the valve plate during the closing process of the valve plate will increase the closing speed of the butterfly valve, thereby causing the valve plate and the valve seat to collide, causing wear or even damage to the valve plate and the valve seat, and causing the high-sealing double-leaf butterfly valve to lose its sealing effect when closed.

[0009] Preferably, the buffer assembly includes a second buffer gear, a fixed rod is connected to the valve seat, the fixed rod is a hollow structure, a rotating rod is rotatably connected inside the fixed rod, the rotating rod is also rotatably connected to the valve seat, the surface of the rotating rod is in contact with the inner wall of the fixed rod, one end of the rotating rod extends to the outside of the fixed rod, the second buffer gear is fixedly connected to the rotating rod, the first buffer gear is meshed with the second buffer gear, and friction damping is provided on the surface of the rotating rod and the inner wall of the fixed rod.

[0010] It is easy to understand that when the driving motor drives the valve plate to close through the valve shaft, the valve shaft rotates to drive the buffer gear to rotate. Since the buffer gear one is meshed with the buffer gear two, the buffer gear one drives the buffer gear two to rotate, and the rotating rod fixedly connected to the buffer gear two rotates with the buffer gear two. At this time, since there is friction damping between the rotating rod and the inner wall of the fixed rod, the rotation speed of the rotating rod and the buffer gear two is slowed down by the friction damping, and the rotation speed of the buffer gear one meshed with the buffer gear two is also slowed down, thereby slowing down the closing speed of the valve plate. This design buffers the closing of the valve plate by setting friction damping on the surface of the rotating rod and the inner wall of the fixed rod, and the structure is simple and compact.

[0011] Preferably, a one-way bearing is arranged between the rotating rod and the buffer gear 2, the buffer gear 1 includes a tooth surface and an arc surface, the tooth surface is meshed with the buffer gear 2, and when the valve plate is fully opened, the tooth surface is away from the buffer gear 2, and when the valve plate is fully opened, the clockwise end of the tooth surface is parallel to the cross-section of the valve seat, and when the valve plate is rotated to an angle of 30° with the cross-section of the valve seat, the tooth surface contacts the buffer gear 2, and the one-way bearing limits the rotation of the buffer gear when the valve plate is closed.

[0012] It is easy to understand that the design sets a one-way bearing between the rotating rod and the buffer gear 2. When the buffer gear 1 follows the valve plate to close and rotate, the one-way bearing locks the buffer gear 2 to drive the rotating rod to rotate and have a buffering effect on the buffer gear. When the buffer gear 1 follows the valve plate to open and rotate, the one-way bearing rotates the buffer gear 2 and cannot drive the rotating rod to rotate. Therefore, the design makes the buffer component only triggered when the valve plate is closed. When the valve plate is opened, the buffer component will not affect the opening speed of the valve plate, which guarantees the opening speed of the valve plate of the high-sealing double-leaf butterfly valve to a certain extent. The design also The buffer gear is divided into a tooth surface and an arc surface. Only when the valve plate is closed to an angle less than 30° between the valve plate and the valve seat cross section, the valve plate will be subjected to a large water flow impact. The tooth surface on the buffer gear rotates to engage with the buffer gear. Only then is the buffer assembly triggered. This design ensures that the valve plate is not affected by the buffer assembly in the first half of the closing process. The buffer assembly buffers the valve plate only when the valve plate is about to be completely closed. Therefore, this design ensures the closing speed of the valve plate of the high-sealing double-leaf butterfly valve, thereby improving the response speed of the valve plate of the high-sealing double-leaf butterfly valve.

[0013] Preferably, a pressure groove is opened on the valve seat, and a pressure block is also arranged on the valve seat, and the pressure block is slidably connected inside the pressure groove, the fixed rod is slidably connected to the valve seat, and the fixed rod is fixedly connected to the pressure block, the rotating rod is rotatably connected to the valve seat, and the rotating rod is slidably connected to the fixed rod, and a spring is arranged between the pressure block and the inner wall of the pressure groove.

[0014] It is easy to understand that during the closing process of the valve plate, the pressure inside the pipeline will gradually increase due to the closing of the valve plate, and the pressure block will push the fixed rod upward after being subjected to the pressure inside the pipeline. The movement of the fixed rod increases the contact area between the fixed rod and the rotating rod, thereby increasing the buffering force of the buffer assembly. The design allows the buffer assembly to adjust the buffering force according to the pressure inside the pipeline by designing the pressure block. When the liquid pressure inside the pipeline is small, the pressure exerted by the liquid on the valve plate has little effect on the closing speed of the valve plate. Therefore, the buffer assembly reduces the buffering force through the pressure block to ensure the closing speed of the valve plate. When the pressure inside the pipeline is large, the pressure exerted by the liquid on the valve plate makes the closing speed of the valve plate faster. Therefore, the buffer assembly increases the buffering force through the pressure block to slow down the closing speed of the valve plate. Therefore, the design ensures the working efficiency of the high-sealing double-leaf butterfly valve when the liquid pressure inside the pipeline is small, and also avoids the collision between the valve plate and the valve seat when the pressure inside the pipeline is large, thereby improving the reliability of the high-sealing double-leaf butterfly valve.

[0015] Preferably, limit blocks are provided on both the upper and lower sides of the buffer gear, and the limit blocks are fixedly connected to the valve shaft. An arc groove is also provided on the valve shaft, and protrusions are also provided on the upper and lower sides of the buffer gear. Push surface one and push surface two are respectively provided on both sides of the arc groove. When the valve plate is closed, push surface one contacts the protrusion, and when the valve plate is opened, push surface two contacts the protrusion.

[0016] It is easy to understand that the design opens an arc groove on the valve shaft and also sets protrusions on the upper and lower sides of the buffer gear. When the valve plate is closing, the buffer gear does not rotate with the valve shaft. Only when the inner wall of the arc groove contacts the protrusion after the valve shaft rotates a certain angle, the buffer gear will rotate with the valve shaft. When the valve plate is fully closed, the upper tooth surface of the buffer gear just leaves the buffer gear two, and when the valve plate is fully opened, the upper tooth surface of the buffer gear also just leaves the buffer gear two. Therefore, the design avoids the tooth surface from colliding with the buffer gear two when it rotates with the buffer gear one to the buffer gear two, thereby causing gear wear. The design further improves the service life of the high-sealing double-leaf butterfly valve.

[0017] Preferably, a clamping plate 1 is provided on the valve shaft, and the clamping plate 1 is fixedly connected to the valve shaft, and a clamping plate 2 is fixedly connected to the fixing rod, and a movable groove is opened on the clamping plate 1, and the clamping plate 1 is in contact with the clamping plate 2, and the bottom edge of the clamping plate 1 is chamfered, and when the valve shaft rotates toward the closing direction of the valve plate, the sliding groove rotates to the position of the clamping plate 2.

[0018] It is easy to understand that during the closing process of the valve plate, if the closing speed of the valve plate suddenly slows down, the valve plate will suddenly be subjected to a large pressure from the liquid inside the pipeline in an instant, which may cause the valve plate to bend and be damaged. The design is provided with a clamping plate 1 on the valve shaft and a clamping plate 2 on the fixed rod. When the valve plate is opened, the valve shaft will drive the clamping plate 1 to rotate. At this time, the clamping plate 1 presses the clamping plate 2 on the fixed rod to the bottom. At this time, the fixed rod cannot move. When the valve plate is closed, the movable groove on the clamping plate 1 will come to the position of the clamping plate 2. At this time, the fixed rod can move. At this time, the pressure block starts to push the fixed rod to increase the buffering force of the buffer assembly. This makes the buffering force of the buffer assembly change from small to large according to the internal pressure of the pipeline, avoiding the sudden slowdown of the closing speed of the valve plate due to the buffering of the buffer assembly. Therefore, the design further improves the reliability of the high-sealing double-leaf butterfly valve.

[0019] Preferably, a locking rod is also provided on the valve seat, and the locking rod is slidably mounted on the valve seat. A locking hole is provided on the buffer gear, and the locking rod is made of a flexible material. When the valve plate is fully closed, the locking rod extends into the locking hole.

[0020] It is easy to understand that when the motor drives the valve plate to close through the valve shaft, the buffer gear 1 rotates with the valve shaft. Since the locking rod is made of flexible material, the locking rod is squeezed by the upper end surface of the buffer gear 1 and bends. When the valve plate is fully closed, the locking hole on the buffer gear 1 rotates with the buffer gear 1 to the position of the locking rod, and the locking rod falls into the locking hole due to its own gravity. This design allows the locking rod to limit the rotation of the buffer gear 1 by cooperating with the locking hole on the buffer gear 1 when the valve plate is fully closed, thereby avoiding the vibration of the buffer gear 1 caused by the water pressure in the pipeline when the valve plate is fully closed, causing the buffer gear 1 to rotate and mesh with the buffer gear 2, resulting in the buffer gear 1 and the buffer gear 2 also buffering the valve plate when the valve plate is fully closed, thereby affecting the effect of the valve plate using liquid pressure to improve the sealing. Therefore, this design improves the reliability of the high-sealing double-leaf butterfly valve.

[0021] Preferably, a sealing ring is provided on the pressure block, and the sealing ring is fixedly mounted on the pressure block, and the sealing ring is in contact with the inner wall of the pressure groove.

[0022] It is easy to understand that since the pressure block is in direct contact with the liquid in the pipeline and slides inside the pressure tank, this design can prevent the liquid from penetrating into the pressure tank through the gap between the pressure block and the inner wall of the pressure tank by setting a sealing ring on the pressure block. Therefore, this design improves the reliability of the high-sealing double-leaf butterfly valve.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This design sets a buffer component inside the valve seat. When the driving motor drives the valve plate to close through the valve shaft, the buffer gear 1 will rotate together with the valve shaft during the closing process of the valve plate. At this time, the buffer component will apply pressure to the buffer gear 1 to slow down the rotation speed of the buffer gear 1, thereby slowing down the closing speed of the valve plate. This design avoids the problem that the pressure of the medium on the valve plate during the closing process of the valve plate will increase the closing speed of the butterfly valve, thereby causing the valve plate and the valve seat to collide, causing the valve plate and the valve seat to wear or even damage, resulting in the high-sealing double-leaf butterfly valve losing its sealing effect when closed.

[0025] 2. This design sets a one-way bearing between the rotating rod and the buffer gear 2 so that the buffer assembly is triggered only when the valve plate is closed. When the valve plate is opened, the buffer assembly will not affect the opening speed of the valve plate, thereby ensuring the opening speed of the valve plate of the high-sealing double-leaf butterfly valve to a certain extent. This design also divides the buffer gear into a tooth surface and an arc surface. This design ensures that the valve plate is not affected by the buffer assembly in the first half of the closing process. The buffer assembly will only buffer the valve plate when the valve plate is about to be completely closed. Therefore, this design ensures the closing speed of the valve plate of the high-sealing double-leaf butterfly valve and improves the response speed of the valve plate.

[0026] 3. This design designs a pressure block on the valve seat so that the buffer component can adjust the buffer force according to the pressure inside the pipeline. When the liquid pressure is small, the pressure exerted by the liquid on the valve plate is small. Therefore, the buffer component reduces the buffer force through the pressure block to ensure the closing speed of the valve plate. When the liquid pressure is large, the pressure exerted by the liquid on the valve plate makes the closing speed of the valve plate faster. Therefore, the buffer component increases the buffer force through the pressure block to slow down the closing speed of the valve plate. Therefore, this design ensures the closing speed of the valve plate when the liquid pressure inside the pipeline is small, and also avoids the collision between the valve plate and the valve seat when the internal pressure of the pipeline is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a high-sealing double-leaf butterfly valve of the present invention;

[0028] Figure 2 for Figure 1 Partial cross-sectional view at AA in the middle;

[0029] Figure 3 for Figure 2 The enlarged view of point B in the middle;

[0030] Figure 4 It is a structural schematic diagram of a highly sealing double-leaf butterfly valve of the present invention when the valve plate is fully opened;

[0031] Figure 5 for Figure 4 Partial cross-sectional view at CC;

[0032] Figure 6 for Figure 5 The enlarged view of point D in the middle;

[0033] Figure 7 for Figure 5 Axonometric view on the right;

[0034] Figure 8 for Figure 7 Enlarged view of point E in the middle.

[0035] In the figure: 1. valve seat; 101. valve shaft; 102. valve plate; 103. linkage gear; 104. buffer gear 1; 105. buffer gear 2; 106. fixed rod; 107. rotating rod; 108. friction damping; 109. one-way bearing; 110. tooth surface; 111. arc surface; 112. pressure groove; 113. pressure block; 114. spring; 115. limit block; 116. arc groove; 117. push surface 1; 118. push surface 2; 119. protrusion; 120. clamping plate 1; 121. clamping plate 2; 122. movable groove; 123. locking rod; 124. locking hole; 125. sealing ring; 2. driving motor. DETAILED DESCRIPTION

[0036] The present invention provides a high-sealing double-leaf butterfly valve, and the technical solution is as follows:

[0037] See also Figures 1 to 3 A high sealing double-leaf butterfly valve comprises a valve seat 1 and a valve shaft 101. A driving motor 2 is arranged on the valve seat 1. The number of valve shafts 101 is 2. The two valve shafts 101 are symmetrically rotated along the axis and connected to the valve seat 1. The two valve shafts 101 are fixedly connected with valve plates 102. The output end of the driving motor 2 is connected to the valve shaft 101. The two valve shafts 101 are fixedly connected with linkage gears 103. The two linkage gears 103 are meshed with each other. A buffer assembly with a buffer gear 104 is also arranged inside the valve seat 1. The buffer gear 104 is fixedly connected to the valve shaft 101. When the buffer gear 104 follows the valve shaft 101 toward the closing direction of the valve plate 102, the buffer gear 104 is rotated along the axis and connected to the valve seat 1. When rotating, the buffer assembly applies pressure to the buffer gear 104. The buffer assembly includes a buffer gear 2 105. A fixed rod 106 is connected to the valve seat 1. The fixed rod 106 is a hollow structure. A rotating rod 107 is rotatably connected inside the fixed rod 106. The rotating rod 107 is also rotatably connected to the valve seat 1. The surface of the rotating rod 107 fits the inner wall of the fixed rod 106. One end of the rotating rod 107 extends to the outside of the fixed rod 106. The buffer gear 2 105 is fixedly connected to the rotating rod 107. The buffer gear 104 is meshed with the buffer gear 2 105. Friction damping 108 is provided on the surface of the rotating rod 107 and the inner wall of the fixed rod 106.

[0038] For further information, see Figures 1 to 3A one-way bearing 109 is arranged between the rotating rod 107 and the buffer gear 105. The buffer gear 104 includes a tooth surface 110 and an arc surface 111. The tooth surface 110 is meshed with the buffer gear 105. When the valve plate 102 is fully opened, the tooth surface 110 is away from the buffer gear 105. When the valve plate 102 is fully opened, the end of the tooth surface 111 in the clockwise direction is parallel to the cross section of the valve seat 1. When the valve plate 102 is rotated to an angle of 30° with the cross section of the valve seat 1, the tooth surface 110 contacts the buffer gear 105. When the valve plate 102 is closed, the one-way bearing 109 limits the rotation of the buffer gear. When the valve plate 102 is closed, the tooth surface 110 is moved away from the buffer gear 105. During the closing process, the one-way bearing 109 limits the rotation of the buffer gear, a pressure groove 112 is opened on the valve seat 1, and a pressure block 113 is also arranged on the valve seat 1. The pressure block 113 is slidably connected inside the pressure groove 112, the fixed rod 106 is slidably connected to the valve seat 1, and the fixed rod 106 is fixedly connected to the pressure block 113, the rotating rod 107 is rotatably connected to the valve seat 1, and the rotating rod 107 is slidably connected to the fixed rod 106, a spring 114 is arranged between the pressure block 113 and the inner wall of the pressure groove 112, a sealing ring 125 is arranged on the pressure block 113, the sealing ring 125 is fixedly mounted on the pressure block 113, and the sealing ring 125 contacts the inner wall of the pressure groove 112.

[0039] See also Figures 3 to 8 , both upper and lower sides of the buffer gear 104 are provided with limit blocks 115, the limit blocks 115 are fixedly connected to the valve shaft 101, the valve shaft 101 is also provided with an arc groove 116, and the upper and lower sides of the buffer gear 104 are also provided with protrusions 119, and both sides of the arc groove 116 are respectively provided with a push surface 117 and a push surface 2 118, when the valve plate 102 is closed, the push surface 117 contacts the protrusion 119, and when the valve plate 102 is opened, the push surface 2 118 contacts the protrusion 119, and a clamping plate 120 is provided on the valve shaft 101, and the clamping plate 120 is fixedly connected to the valve shaft 101, A second card plate 121 is fixedly connected to the fixed rod 106, and a movable groove 122 is provided on the first card plate 120. The first card plate 120 is in contact with the second card plate 121, and the bottom edge of the first card plate 120 is chamfered. During the rotation of the valve shaft 101 toward the closing direction of the valve plate 102, the sliding groove rotates to the position of the second card plate 121. A locking rod 123 is also provided on the valve seat 1, and the locking rod 123 slides on the valve seat 1. A locking hole 124 is provided on the buffer gear 104. The locking rod 123 is made of flexible material. When the valve plate 102 is fully closed, the locking rod 123 extends into the locking hole 124.

[0040] See also Figures 1 to 8When the driving motor 2 drives the valve plate 102 to close, the driving motor 2 is started at this time, and the output end of the driving motor 2 drives one of the valve shafts 101 to rotate. The two valve shafts 101 rotate simultaneously through the rotation of the linkage gear 103, and the valve plates 102 on the two valve shafts 101 rotate together with the valve shafts 101. At this time, the card plate 120 and the arc groove 116 on the valve shaft 101 rotate together with the valve shaft 101, and the sliding groove on the card plate 120 rotates with the card plate 120. When the angle between the cross section of the valve plate 102 and the valve shaft 101 is less than 30°, the movable groove 122 on the card plate 120 rotates to the position of the card plate 2 121. At this time, the card plate 120 no longer restricts the movement of the card plate 2 121. At this time, the pressure of the liquid in the pipeline acts on the pressure block 113 to make the pressure block 113 squeeze the spring 114 and slide in the pressure groove 112. The pressure block 1 The fixed rod 106 on 13 moves with the pressure block 113. At this time, the contact area between the fixed rod 106 and the rotating rod 107 gradually increases. At the same time, the pushing surface 117 on the arc groove 116 contacts the protrusion 119 on the buffer gear 104 and pushes the buffer gear 104 through the protrusion 119. At this time, the tooth surface 110 on the buffer gear 104 rotates and meshes with the buffer gear 2 105. The buffer gear 2 105 rotates and drives the rotating shaft to rotate through the one-way bearing 109. At this time, the valve shaft 101 continues to rotate, and the pushing surface 117 continues to push the buffer gear 104. When the tooth surface 110 on the buffer gear 104 just leaves the buffer gear 2 105, the valve plate 102 is completely closed, and the locking hole 124 on the buffer gear 104 rotates to the position of the locking rod 123. At this time, the locking rod 123 falls into the locking hole 124.

[0041] See also Figures 1 to 8When the driving motor 2 drives the valve plate 102 to open, the driving motor 2 is started, and the output end of the driving motor 2 drives one of the valve shafts 101 to rotate. The two valve shafts 101 rotate simultaneously through the rotation of the linkage gear 103, and the valve plates 102 on the two valve shafts 101 rotate together with the valve shafts 101. At this time, the card plate 120 and the arc groove 116 on the valve shaft 101 rotate together with the valve shaft 101, and the sliding groove on the card plate 120 rotates with the card plate 120. When the card plate 120 rotates a certain distance, the sliding groove on the card plate 120 moves away from the card plate 2 121. At this time, the bottom of the card plate 120 is in contact with the card plate 2 121. The second buffer gear 104 is pressed against the card plate 121, and at the same time, the pushing surface 118 on the arc groove 116 contacts the protrusion 119 on the buffer gear 104, and the pushing surface 118 pushes the buffer gear 104 through the protrusion 119. At this time, the tooth surface 110 on the buffer gear 104 rotates and meshes with the buffer gear 105. Due to the action of the one-way bearing 109, the buffer gear 105 rotates around the rotating rod 107. When the buffer gear 104 rotates, the locking hole 124 on the buffer gear 104 moves away from the locking rod 123, and the locking rod 123 is squeezed and contracted by the upper end surface of the buffer gear 104, and the valve shaft 101 continues to rotate until the valve plate 102 is fully opened.

[0042] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A high-sealing double-leaf butterfly valve, comprising a valve seat (1) and a valve shaft (101), wherein a driving motor (2) is arranged on the valve seat (1), the number of the valve shafts (101) is 2, the two valve shafts (101) are connected to the valve seat (1) symmetrically along the axis, the two valve shafts (101) are fixedly connected to a valve plate (102), the output end of the driving motor (2) is connected to the valve shaft (101), and the valve seat (1) is provided with a driving motor (2), wherein the driving motor (2) is connected to the valve shaft (101), and the valve shaft (101) is provided with a driving motor (2), wherein the driving motor (2) is connected to the valve shaft (101), and the valve seat (1) is provided with a driving motor (2), wherein the driving motor (2) is connected to the valve shaft (101), and the driving motor (2) is connected to the valve shaft (101), A linkage gear (103) is fixedly connected to the two valve shafts (101), and the two linkage gears (103) are meshed with each other. A buffer assembly having a buffer gear 1 (104) is also arranged inside the valve seat (1), and the buffer gear 1 (104) is fixedly connected to the valve shaft (101). When the buffer gear 1 (104) follows the valve shaft (101) and rotates in the closing direction of the valve plate (102), the buffer assembly applies pressure to the buffer gear 1 (104).

2. A high sealing double-leaf butterfly valve according to claim 1, characterized in that: The buffer assembly comprises a buffer gear 2 (105), a fixed rod (106) is connected to the valve seat (1), the fixed rod (106) is a hollow structure, a rotating rod (107) is rotatably connected inside the fixed rod (106), the rotating rod (107) is also rotatably connected to the valve seat (1), the surface of the rotating rod (107) is in contact with the inner wall of the fixed rod (106), one end of the rotating rod (107) extends to the outside of the fixed rod (106), the buffer gear 2 (105) is fixedly connected to the rotating rod (107), the buffer gear 1 (104) is meshed with the buffer gear 2 (105), and friction damping (108) is provided on the surface of the rotating rod (107) and the inner wall of the fixed rod (106).

3. A high sealing double-leaf butterfly valve according to claim 2, characterized in that: A one-way bearing (109) is arranged between the rotating rod (107) and the buffer gear 2 (105); the buffer gear 1 (104) includes a tooth surface portion (110) and an arc surface portion (111); the tooth surface portion (110) is meshed with the buffer gear 2 (105); when the valve plate (102) is fully opened, the tooth surface portion (110) is away from the buffer gear 2 (105); when the valve plate (102) is fully opened, the end of the tooth surface portion (111) in the clockwise direction is parallel to the cross section of the valve seat (1); when the valve plate (102) is rotated to an angle of 30° with the cross section of the valve seat (1), the tooth surface portion (110) contacts the buffer gear 2 (105); when the valve plate (102) is closed, the one-way bearing (109) limits the rotation of the buffer gear.

4. A high sealing double-leaf butterfly valve according to claim 3, characterized in that: The valve seat (1) is provided with a pressure groove (112), and the valve seat (1) is also provided with a pressure block (113), and the pressure block (113) is slidably connected inside the pressure groove (112). The fixed rod (106) is slidably connected to the valve seat (1), and the fixed rod (106) is fixedly connected to the pressure block (113), and the rotating rod (107) is slidably connected to the fixed rod (106), and a spring (114) is provided between the pressure block (113) and the inner wall of the pressure groove (112).

5. A high sealing double-leaf butterfly valve according to claim 3, characterized in that: The buffer gear 1 (104) is provided with limit blocks (115) on both upper and lower sides. The limit blocks (115) are fixedly connected to the valve shaft (101). The valve shaft (101) is also provided with an arc groove (116). The buffer gear 1 (104) is also provided with protrusions (119) on both upper and lower sides. The arc groove (116) is also provided with a push surface 1 (117) and a push surface 2 (118) on both sides. When the valve plate (102) is closed, the push surface 1 (117) contacts the protrusion (119). When the valve plate (102) is opened, the push surface 2 (118) contacts the protrusion (119).

6. A high sealing double-leaf butterfly valve according to claim 4, characterized in that: A clamping plate 1 (120) is arranged on the valve shaft (101), and the clamping plate 1 (120) is fixedly connected to the valve shaft (101). A clamping plate 2 (121) is fixedly connected to the fixing rod (106). A movable groove (122) is provided on the clamping plate 1 (120), and the clamping plate 1 (120) is in contact with the clamping plate 2 (121). The bottom edge of the clamping plate 1 (120) is chamfered. When the valve shaft (101) rotates in the closing direction of the valve plate (102), the sliding groove rotates to the position of the clamping plate 2 (121).

7. A high sealing double-leaf butterfly valve according to claim 2, characterized in that: The valve seat (1) is also provided with a locking rod (123), and the locking rod (123) is slidably mounted on the valve seat (1). A locking hole (124) is provided on the buffer gear (104). The locking rod (123) is made of a flexible material. When the valve plate (102) is fully closed, the locking rod (123) extends into the locking hole (124).

8. A high sealing double-leaf butterfly valve according to claim 4, characterized in that: The pressure block (113) is provided with a sealing ring (125), the sealing ring (125) is fixedly mounted on the pressure block (113), and the sealing ring (125) is in contact with the inner wall of the pressure groove (112).

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