Butterfly valve with high sealing performance

Abstract

The invention relates to the technical field of butterfly valves, in particular to a high-sealing-performance butterfly valve which comprises a valve body, a valve rod, a valve plate, a sealing ring and a pressing plate are sequentially arranged on the valve body in the axial direction, a mounting seat is fixedly mounted between a rod body of the valve rod and the valve plate, and an electric actuator is arranged on the top side of the valve body. One end of the valve rod is rotationally inserted into the inner bottom wall of the valve body, the other end of the valve rod rotationally penetrates through the top side of the valve body and is connected with the electric actuator, the sealing ring is fixedly installed on the valve plate, the pressing plate is installed in the valve body in a sliding mode, and a pull rope is fixedly installed on the face, close to the valve plate, of the pressing plate. The end, away from the valve plate, of the pull rope slidably penetrates through the valve plate and the mounting base and then is fixedly connected with the inner bottom wall of the valve body. The butterfly valve has the effect of improving the sealing performance of the butterfly valve.

Description

Technical Field

[0001] This application relates to the technical field of butterfly valves, and particularly to a butterfly valve with high sealing performance. Background Art

[0002] As a common fluid control device, butterfly valves are widely used in industries such as industry and agriculture. With advantages such as fast opening and closing speed, small operating torque, and compact installation space, they play an important role in pipeline systems. The structural design of butterfly valves enables them to quickly open and close the fluid passage, thereby improving production efficiency and system stability while reducing the maintenance cost of the equipment.

[0003] Currently, to solve the problem of poor sealing performance of butterfly valves, the following methods are usually adopted in the industry: one is to improve the sealing effect by increasing the thickness of the sealing material or replacing it with a high-performance sealing material; the second is to optimize the contact surface shape between the valve plate and the valve seat, such as using a conical sealing surface or a spherical sealing surface; the third is to add an auxiliary pressing device to tightly fit the valve plate and the valve seat by mechanical force.

[0004] However, during the opening and closing process of the butterfly valve, the sealing ring presses against the inner wall of the valve body and moves, which is likely to cause wear due to friction, thereby reducing the sealing performance. This wear will not only shorten the service life of the butterfly valve but also may lead to problems such as fluid leakage. Summary of the Invention

[0005] In order to improve the sealing performance of the butterfly valve, this application provides a butterfly valve with high sealing performance.

[0006] The butterfly valve with high sealing performance provided by this application adopts the following technical solutions: A butterfly valve with high sealing performance includes a valve body. Along the axial direction, a valve stem, a valve plate, a sealing ring, and a pressing plate are sequentially arranged in the valve body. An installation seat is fixedly installed between the rod body of the valve stem and the valve plate. An electric actuator is arranged on the top side of the valve body. One end of the valve stem is rotatably inserted into the inner bottom wall of the valve body, and the other end of the valve stem rotatably penetrates the top side of the valve body and is connected to the electric actuator. The sealing ring is fixedly installed on the valve plate, the pressing plate is slidably installed inside the valve body, a pulling rope is fixedly installed on the surface of the pressing plate close to the valve plate, and the end of the pulling rope away from the valve plate slidably penetrates the valve plate and the installation seat and is fixedly connected to the inner bottom wall of the valve body.

[0007] By adopting the above technical solutions, when the electric actuator closes the butterfly valve, the pulling rope is tightened, so that the pressing plate presses the sealing ring. After the sealing ring expands, it presses the inner wall of the valve body, thereby improving the sealing performance of the butterfly valve. When the electric actuator opens the butterfly valve, the pulling rope loosens, and the restoration of the sealing ring drives the pressing plate away from the valve plate, and the pressing force of the sealing ring on the inner wall of the valve body decreases, thereby reducing the wear of the sealing ring and further improving the sealing performance of the butterfly valve.

[0008] Optionally, the mounting seat is provided with a sliding opening, a sliding rod is rotatably installed inside the sliding opening, a sliding block is arranged inside the sliding opening, the sliding rod thread passes through the sliding block, and the pull rope slides through the sliding block.

[0009] By adopting the above technical solution, the threaded connection structure between the slide rod and the slider can realize the precise displacement of the slider on the slide rod, thereby ensuring that the tension of the pull rope is adjustable and improving the stability of the sealing performance.

[0010] Optionally, ratchets are fixedly sleeved at both ends of the sliding rod, and the ratchet is provided with a lifting rod. The mounting seat is provided with a lifting port for the lifting rod to lift and slide, and the lifting port is connected with the sliding port. The lifting rod is elastically hinged with a pawl, and the lifting rod is installed with a driving mechanism, and the driving mechanism is used to drive the lifting rod to lift and lower, and the lifting rods located at both ends of the sliding rod descend to drive the ratchets to rotate in the opposite direction.

[0011] By adopting the above technical solution, the ratchets fixedly mounted at both ends of the slide bar cooperate with the lifting rod to achieve precise control of the rotation of the slide bar. When the lifting rod descends, the hinged pawl drives the ratchet to rotate, and the lifting rods at both ends of the slide bar drive the ratchet to rotate in opposite directions when descending, thereby ensuring the two-way adjustment capability of the slide bar.

[0012] Optionally, the driving mechanism includes a driving block and an electromagnet, the driving block is fixedly mounted on the bottom end of the lifting rod, the electromagnet is arranged on the outer bottom wall of the valve body, the electromagnet is used to attract the driving block, the driving block and the lifting rod both have buoyancy, and the electric actuator has a built-in control module, and the control module is used to open and close the electromagnet.

[0013] By adopting the above technical solution, the suction force between the electromagnet and the drive block can accurately control the lifting action of the lifting rod, thereby adjusting the matching state of the pawl and the ratchet. This design not only improves the stability of the ratchet transmission, but also uses buoyancy to assist the lifting rod to reset without additional mechanical power, effectively reducing energy consumption. In addition, the control module built into the electric actuator opens and closes the electromagnet, realizing automatic control, further improving the convenience and reliability of butterfly valve operation.

[0014] Optionally, a mounting port is provided in a portion of the valve body below the driving block, a shielding film is fixedly installed on the top edge of the mounting port, the electromagnet is located inside the mounting port, a connecting rod is fixedly installed on the circumference of the electromagnet, and a first connecting groove and a second connecting groove for sliding movement of the connecting rod are provided on the inner wall of the mounting port, the first connecting groove is arranged along the axial direction of the mounting port, the second connecting groove is arranged along the circumferential direction of the inner wall of the mounting port, and one end of the first connecting groove is connected to the top end of the second connecting groove.

[0015] By adopting the above technical solution, the shielding film can effectively prevent fluid from entering the interior of the installation port, protecting components such as the electromagnet from fluid erosion, thereby improving the reliability of the device. The settings of the first connection groove and the second connection groove enable the connecting rod to achieve axial and circumferential sliding within the installation port, facilitating the fixation of the electromagnet inside the installation port.

[0016] Optionally, a partition block is fixedly installed on the bottom side of the electromagnet, a pressure sensor is fixedly installed on the bottom side of the partition block, the connecting rod is fixedly installed on the periphery of the pressure sensor, the pressure sensor generates a pressure signal according to the pressure received by the electromagnet, and the control module controls the magnetic force of the electromagnet according to the pressure signal.

[0017] By adopting the above technical solution, precise control of the magnetic force of the electromagnet is achieved. The pressure sensor can monitor the pressure received by the electromagnet in real time and transmit the pressure signal to the control module. The control module adjusts the magnitude of the magnetic force of the electromagnet according to the received pressure signal, thereby ensuring that the attraction force of the electromagnet on the driving block is always in the optimal state.

[0018] Optionally, a water-absorbing cotton is fixedly installed on the top side of the driving block, a water-absorbing rope is connected to the periphery of the water-absorbing cotton, a guiding groove body is hinged to the periphery of the driving block, a limiting rod is fixedly installed between the two inner side walls of the guiding groove body, a floating block is fixedly installed at one end of the guiding groove body away from the driving block, the water-absorbing rope is arranged along the guiding groove body and fixedly connected to the floating block, the floating block rotates downward and abuts against the inner bottom wall of the valve body, and the floating block floats upward and is damped and inserted into the sliding opening.

[0019] By adopting the above technical solution, when the butterfly valve is opened, the driving block floats upward and compresses the water-absorbing cotton, thereby reducing the water absorption amount of the water-absorbing cotton. At the same time, the floating block floats upward and is damped and inserted into the interior of the sliding opening. When the butterfly valve is closed, the water on the side of the valve plate away from the pressing plate is discharged, the driving block descends under the action of gravity, and at the same time, the driving block drives the guiding groove body to descend, so that the floating block is pulled out of the sliding opening. After the floating block is pulled out of the sliding opening, the guiding groove body rotates downward, so that the floating block abuts against the inner bottom wall of the valve body. If the butterfly valve leaks, the water-absorbing rope guides the water to the water-absorbing cotton, and the weight of the water-absorbing cotton increases, thereby reducing the attraction force required for the electromagnet to drive the driving block to descend.

[0020] Optionally, a guiding rod is fixedly installed on the surface of the valve plate close to the pressing plate, the guiding rod slidably penetrates through the pressing plate, and a limiting block is fixedly installed at one end of the guiding rod away from the valve plate.

[0021] By adopting the above technical solution, the setting of the guiding rod can guide the sliding of the pressing plate, ensuring that the pressing plate moves stably along the axis inside the valve body. The setting of the limiting block effectively prevents the pressing plate from detaching from the guiding rod, thereby ensuring the reliability and stability of the entire butterfly valve structure.

[0022] Optionally, a first elastic cylinder is provided on the side of the valve plate away from the pressing plate. The circumferential side of the first elastic cylinder is fixedly connected to the valve plate, and the pulling rope fixedly penetrates through the first elastic cylinder.

[0023] By adopting the above technical solution, the setting of the first elastic cylinder can effectively prevent fluid from leaking through the gap between the valve plate and the pulling rope, thereby improving the overall sealing performance of the butterfly valve.

[0024] Optionally, a second elastic cylinder is fixedly installed between the valve plate and the pressing plate, and the sealing ring is sleeved on the second elastic cylinder.

[0025] By adopting the above technical solution, the setting of the second elastic cylinder improves the sealing performance between the valve plate and the pressing plate, thereby reducing the entry of water between the valve plate and the pressing plate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: The electric actuator drives the valve stem to rotate, driving the valve plate to rotate to realize the opening and closing operation of the butterfly valve. At the same time, when the butterfly valve is closed, the pulling rope is tightened, and the pulling rope drives the pressing plate to press the sealing ring, thereby effectively improving the sealing performance of the butterfly valve. When the butterfly valve is opened, the pulling rope loosens, facilitating the pressing plate to release the sealing ring, reducing the pressing force of the sealing ring on the inside of the valve body, and further reducing the frictional loss between the sealing ring and the inside of the valve body; By rotating the sliding rod to adjust the position of the slider inside the sliding opening, the tightness of the pulling rope when the sticker butterfly valve is closed is facilitated, and further the pressing force of the pressing plate on the sealing ring is conveniently adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall mechanism schematic diagram from the first perspective of the embodiment of the present application; Figure 2 is Figure 1 the cross-sectional view at A-A; Figure 3 is Figure 2 the enlarged view at A; Figure 4 is the exploded view of the guide rod of the embodiment of the present application; Figure 5 is the structural schematic diagram inside the valve body of the embodiment of the present application; Figure 6 is the structural schematic diagram of the mounting seat of the embodiment of the present application; Figure 7 is the overall mechanism schematic diagram from the second perspective of the embodiment of the present application; Figure 8 is Figure 7 the enlarged view at B; Figure 9 is Figure 1 the enlarged view at C; Figure 10It is a schematic structural diagram of the guiding groove body and the floating block according to an embodiment of the present application.

[0028] Explanation of reference numerals: 1, valve body; 2, valve stem; 3, electric actuator; 4, valve plate; 5, mounting seat; 6, sealing ring; 7, pressing plate; 8, guiding rod; 9, limiting block; 10, sliding opening; 11, sliding rod; 12, sliding block; 13, pulling rope; 14, ratchet wheel; 15, ratchet pawl; 16, lifting rod; 17, lifting opening; 18, mounting groove; 19, elastic rope; 20, driving mechanism; 201, driving block; 202, electromagnet; 21, mounting opening; 22, shielding film; 23, dividing block; 24, pressure sensor; 25, connecting rod; 26, first connecting groove; 27, second connecting groove; 28, water-absorbing cotton; 29, water-absorbing rope; 30, guiding groove body; 31, limiting rod; 32, floating block; 33, first elastic cylinder; 34, second elastic cylinder. Detailed implementation manners

[0029] The following is a further detailed description of the present application in conjunction with the attached Figures 1 - 10 drawings.

[0030] An embodiment of the present application discloses a butterfly valve with high sealing performance.

[0031] Referring to Figure 1 , a butterfly valve with high sealing performance includes a valve body 1. A valve stem 2 is arranged on the valve body 1. An electric actuator 3 is arranged on the top side of the valve body 1. One end of the valve stem 2 is fixedly connected to the electric actuator 3, and the other end of the valve stem 2 rotatably penetrates through the top side of the valve body 1 and then rotatably inserts into the inner bottom wall of the valve body 1. The hole formed by the valve body 1 passing through the valve body 1 is sealed with packing, and the electric actuator 3 is used to drive the valve stem 2 to rotate.

[0032] Referring to Figure 2 , Figure 3 , a valve plate 4 is arranged inside the valve body 1. A mounting seat 5 is fixedly installed between the rod body of the valve stem 2 and one side of the valve plate 4. A sealing ring 6 is fixedly installed along the edge on the side of the valve plate 4 away from the valve stem 2. A pressing plate 7 is arranged in a manner of abutting against the side of the sealing ring 6 away from the valve plate 4.

[0033] Referring to Figure 3 , Figure 4 , a guiding rod 8 is fixedly installed on the side of the valve plate 4 close to the pressing plate 7. The guiding rod 8 slidably penetrates through the pressing plate 7. The guiding rod 8 is used to guide the pressing plate 7 to slide axially along the valve body 1, so as to improve the stability of the movement of the pressing plate 7. A limiting block 9 is fixedly installed at the end of the guiding rod 8 away from the valve plate 4. The limiting block 9 limits the pressing plate 7, so as to reduce the situation that the pressing plate 7 falls off the guiding rod 8.

[0034] Referring to Figure 5 , Figure 6The mounting seat 5 is provided with a sliding opening 10, and a sliding rod 11 is rotatably mounted inside the sliding opening 10. A slider 12 is arranged inside the sliding opening 10, and the sliding rod 11 is threadedly penetrated through the slider 12. The sliding rod 11 is rotated, so that the slider 12 slides inside the sliding opening 10. A pull rope 13 is fixedly mounted on the side of the pressure plate 7 close to the valve plate 4, and the end of the pull rope 13 away from the valve plate 4 slides through the valve plate 4 and the slider 12 and is fixedly connected to the inner bottom wall of the valve body 1.

[0035] When the butterfly valve is opened, the pull rope 13 is loosened, so that the sealing ring 6 is restored, and the pressing force of the sealing ring 6 on the inner wall of the valve body 1 is reduced, thereby reducing the friction loss between the sealing ring 6 and the inner wall of the valve body 1, thereby improving the sealing performance of the butterfly valve.

[0036] When the butterfly valve is closed, the draw rope 13 is tightened, and the draw rope 13 drives the pressure plate 7 to press the sealing ring 6. The sealing ring 6 expands and presses the inner wall of the valve body 1, thereby improving the sealing performance of the butterfly valve.

[0037] Reference Figure 3 , Figure 6 , ratchets 14 are fixedly sleeved at both ends of the slide bar 11, and the ratchet 14 is provided with a lifting rod 16. The mounting seat 5 is provided with a lifting port 17 for the lifting rod 16 to lift and slide, and the lifting port 17 is connected to the sliding port 10. The lifting rod 16 is provided with a mounting groove 18, and a pawl 15 is hinged on the inner wall of the mounting groove 18. The pawl 15 rotates upward and abuts against the inner top wall of the mounting groove 18, thereby playing a limiting role. An elastic rope 19 is connected to the top side of the pawl 15, and one end of the elastic rope 19 away from the pawl 15 is fixedly connected to the lifting rod 16, and the elastic rope 19 is used to drive the pawl 15 to rotate upward, thereby realizing the elastic hinge between the pawl 15 and the lifting rod 16.

[0038] Reference Figure 3 The lifting rod 16 is provided with a driving mechanism 20, and the driving mechanism 20 is used to drive the lifting rod 16 to move up and down. The lifting rods 16 located at both ends of the slide bar 11 descend and drive the ratchet 14 to rotate in the opposite direction. When the driving mechanism 20 drives the lifting rod 16 to descend, the pawl 15 moves the ratchet 14, thereby driving the slide bar 11 to rotate, thereby facilitating the adjustment of the position of the slider 12 inside the slide 10. By adjusting the position of the slider 12 inside the slide 10, it is convenient to adjust the pulling force of the pull rope 13 on the pressure plate 7 after the butterfly valve is closed.

[0039] Reference Figure 3 The driving mechanism 20 includes a driving block 201 and an electromagnet 202. The driving block 201 is fixedly mounted on the bottom end of the lifting rod 16. The electromagnet 202 is arranged on the outer bottom wall of the valve body 1, and the electromagnet 202 is used to attract the driving block 201. The driving block 201 and the lifting rod 16 both have buoyancy. The electric actuator 3 is built with a control module, and the control module is used to open and close the electromagnet 202.

[0040] When the butterfly valve is opened, water flows through the butterfly valve, causing the driving block 201 to float. When the butterfly valve is closed, the water on the side of the valve plate 4 away from the pressing plate 7 is discharged, and the driving block 201 moves downward under gravity, so that the pawl 15 abuts against the ratchet wheel 14. Then the control module activates the electromagnet 202, and the electromagnet 202 attracts the driving block 201, so that the driving block 201 further descends, and then the pawl 15 toggles the ratchet wheel 14 to rotate. By activating the electromagnets 202 under different lifting rods 16, it is convenient to control the sliding of the slider 12 inside the sliding port 10, and then it is convenient to adjust the pulling force of the pulling rope 13 on the pressing plate 7.

[0041] Referring to Figure 3 、 Figure 7 、 Figure 8 As shown in FIGS.

[0042] The connecting rod 25 enters the second connecting groove 27 from the first connecting groove 26, which facilitates the installation of the electromagnet 202 on the valve body 1. At the same time, the arrangement of the installation port 21 reduces the distance between the electromagnet 202 and the driving block 201, which facilitates the electromagnet 202 to attract the driving block 201.

[0043] After each time the electromagnet 202 attracts the driving block 201 to make the ratchet wheel 14 rotate, the driving block 201 impacts the electromagnet 202, so that the pressure detected by the pressure sensor 24 increases. The pressure sensor 24 generates a pressure signal according to the received pressure and sends it to the control module. After the pawl 15 toggles the ratchet wheel 14 each time, the slider 12 will slide. The control module counts the number of times the two driving blocks 201 impact the electromagnet 202 according to the pressure signal, so as to facilitate counting the number of times the pawl 15 toggles the ratchet wheel 14 to rotate.

[0044] The number of rotations of one ratchet wheel 14 is taken as a positive value, and the other is taken as a negative value. The control module adds the number of rotations of the two ratchet wheels 14 to obtain an offset number. The control module has a pre-recorded offset comparison table, and the offset comparison table is the attraction force required by the electromagnet 202 corresponding to the offset number. The control module adjusts the attraction force of the electromagnet 202 on the driving block 201 according to the offset number and the offset comparison table, so as to facilitate the electromagnet 202 to attract the driving block 201 to descend.

[0045] Reference Figure 9 , Figure 10 The top side of the driving block 201 is fixedly installed with absorbent cotton 28, and the surrounding side of the absorbent cotton 28 is connected with an absorbent rope 29. The surrounding side of the driving block 201 is hinged with a guide groove body 30, and a limit rod 31 is fixedly installed between the two inner side walls of the guide groove body 30. A floating block 32 is fixedly installed at one end of the guide groove body 30 away from the driving block 201, and the absorbent rope 29 is arranged along the guide groove body 30 and fixedly connected to the floating block 32.

[0046] When the butterfly valve is opened, the driving block 201 floats up and squeezes the absorbent cotton 28, the amount of water absorbed by the absorbent cotton 28 decreases, and the floating block 32 moves upward due to the buoyancy and inserts into the inner part of the sliding port 10 with damping. After the butterfly valve is closed, the water on the side of the valve plate 4 away from the pressure plate 7 is gradually discharged. The driving block 201 descends, and the driving block 201 releases the absorbent cotton 28. After the driving block 201 descends, the pawl 15 abuts against the ratchet 14, and the driving block 201 stops descending. At the same time, the floating block 32 is pulled out from the sliding port 10, and then the floating block 32 rotates downward due to gravity and abuts against the inner bottom wall of the valve body 1.

[0047] After the floating block 32 abuts against the inner bottom wall of the valve body 1, if the butterfly valve does not leak, the absorbent cotton 28 does not absorb water, and the weight of the absorbent cotton 28 is small. The electromagnet 202 that tightens the pull rope 13 opens to attract the driving block 201 after the butterfly valve is closed for a period of time, and the attraction of the electromagnet 202 is small, so the driving block 201 cannot descend.

[0048] If the butterfly valve leaks, the absorbent cotton 28 guides water to the absorbent cotton 28, thereby increasing the weight of the absorbent cotton 28. The electromagnet 202 that tightens the pull rope 13 is turned on to attract the drive block 201 after the butterfly valve is closed for a period of time. The attraction of the electromagnet 202 to the drive block 201 and the weight of the absorbent cotton 28 cause the drive block 201 to descend. After the drive block 201 descends, the pawl 15 moves the ratchet wheel 14, so that the pull rope 13 further tightens the pressure plate 7, which is conducive to stopping the leakage of the butterfly valve.

[0049] Reference Figure 2 , Figure 3 A first elastic tube 33 is provided on the side of the valve plate 4 away from the pressure plate 7. The circumference of the first elastic tube 33 is fixedly connected to the valve plate 4. The pull rope 13 is fixedly passed through the first elastic tube 33. A second elastic tube 34 is fixedly installed between the valve plate 4 and the pressure plate 7. The sealing ring 6 is sleeved on the second elastic tube 34. Both the first elastic tube 33 and the second elastic tube 34 play a sealing role, thereby reducing the occurrence of water entering between the pressure plate 7 and the valve plate 4. At the same time, the second elastic tube 34 supports the sealing ring 6, thereby improving the sealing performance of the butterfly valve.

[0050] The implementation principle of a butterfly valve with high sealing performance in an embodiment of the present application is as follows: When the butterfly valve is closed, the pulling rope 13 pulls the pressing plate 7, so that the pressing plate 7 presses the sealing ring 6 tightly. After being squeezed by the pressing plate 7, the sealing ring 6 expands and tightly abuts against the inner wall of the valve body 1, thereby improving the sealing performance of the butterfly valve.

[0051] When the butterfly valve is opened, the pulling rope 13 becomes loose, so that the pressing plate 7 releases the sealing ring 6. The sealing ring 6 returns to its original state, thereby reducing the pressing force of the sealing ring 6 on the inner wall of the valve body 1, and further reducing the frictional loss between the sealing ring 6 and the valve body 1, and improving the sealing performance of the butterfly valve.

[0052] The above are all preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: Any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A butterfly valve with high sealing performance, characterized by: The valve body (1) comprises a valve stem (2), a valve plate (4), a sealing ring (6) and a pressure plate (7) arranged in sequence along the axial direction; a mounting seat (5) is fixedly installed between the stem of the valve stem (2) and the valve plate (4); an electric actuator (3) is arranged on the top side of the valve body (1); one end of the valve stem (2) is rotatably inserted into the inner bottom wall of the valve body (1); the other end of the valve stem (2) is rotatably penetrated through the top side of the valve body (1) and connected to the electric actuator (3); the sealing ring (6) is fixedly installed on the valve plate (4); the pressure plate (7) is slidably installed inside the valve body (1); a pull rope (13) is fixedly installed on a side of the pressure plate (7) close to the valve plate (4); the end of the pull rope (13) away from the valve plate (4) slides through the valve plate (4) and the mounting seat (5) and is fixedly connected to the inner bottom wall of the valve body (1).

2. A high sealing performance butterfly valve according to claim 1, characterized in that: The mounting seat (5) is provided with a sliding opening (10), a sliding rod (11) is rotatably mounted inside the sliding opening (10), a sliding block (12) is arranged inside the sliding opening (10), the sliding rod (11) is threadedly passed through the sliding block (12), and the pull rope (13) is slidably passed through the sliding block (12).

3. A high sealing performance butterfly valve according to claim 2, characterized in that: Both ends of the slide bar (11) are fixedly sleeved with ratchets (14), and the ratchet (14) is provided with a lifting rod (16). The mounting seat (5) is provided with a lifting opening (17) for the lifting rod (16) to lift and slide, and the lifting opening (17) is communicated with the slide opening (10). The lifting rod (16) is elastically hinged with a ratchet (15). The lifting rod (16) is provided with a driving mechanism (20), and the driving mechanism (20) is used to drive the lifting rod (16) to lift and lower. When the lifting rods (16) at both ends of the slide bar (11) descend, the rotation direction of the ratchet (14) is opposite.

4. A high sealing performance butterfly valve according to claim 3, characterized in that: The driving mechanism (20) comprises a driving block (201) and an electromagnet (202); the driving block (201) is fixedly mounted on the bottom end of the lifting rod (16); the electromagnet (202) is arranged on the outer bottom wall of the valve body (1); the electromagnet (202) is used to attract the driving block (201); the driving block (201) and the lifting rod (16) both have buoyancy; the electric actuator (3) is equipped with a control module, and the control module is used to open and close the electromagnet (202).

5. A high sealing performance butterfly valve according to claim 4, characterized in that: The valve body (1) is provided with a mounting opening (21) at a portion located below the driving block (201); a shielding film (22) is fixedly installed on the top edge of the mounting opening (21); the electromagnet (202) is located inside the mounting opening (21); a connecting rod (25) is fixedly installed on the circumference of the electromagnet (202); and the inner wall of the mounting opening (21) is provided with a first connecting groove (26) and a second connecting groove (27) for the connecting rod (25) to slide; the first connecting groove (26) is arranged along the axial direction of the mounting opening (21); the second connecting groove (27) is arranged along the circumferential direction of the inner wall of the mounting opening (21); and one end of the first connecting groove (26) is connected to the top end of the second connecting groove (27).

6. A high sealing performance butterfly valve according to claim 5, characterized in that: A partition block (23) is fixedly mounted on the bottom side of the electromagnet (202), a pressure sensor (24) is fixedly mounted on the bottom side of the partition block (23), the connecting rod (25) is fixedly mounted on the peripheral side of the pressure sensor (24), the pressure sensor (24) generates a pressure signal according to the pressure applied to the electromagnet (202), and the control module controls the magnetic force of the electromagnet (202) according to the pressure signal.

7. A high sealing performance butterfly valve according to claim 4, characterized in that: A water-absorbing cotton (28) is fixedly installed on the top side of the driving block (201), and a water-absorbing rope (29) is connected to the peripheral side of the water-absorbing cotton (28). A guide groove body (30) is hingedly connected to the peripheral side of the driving block (201), and a limit rod (31) is fixedly installed between the two inner side walls of the guide groove body (30). A floating block (32) is fixedly installed at one end of the guide groove body (30) away from the driving block (201). The water-absorbing rope (29) is arranged along the guide groove body (30) and is fixedly connected to the floating block (32). The floating block (32) rotates downward to abut against the inner bottom wall of the valve body (1), and the floating block (32) floats upward to damp the insertion slide (10).

8. The high sealing performance butterfly valve according to claim 1, characterized in that: A guide rod (8) is fixedly mounted on one side of the valve plate (4) close to the pressure plate (7); the guide rod (8) slides through the pressure plate (7); and a limit block (9) is fixedly mounted on one end of the guide rod (8) away from the valve plate (4).

9. The high sealing performance butterfly valve according to claim 1, characterized in that: A first elastic tube (33) is provided on a side of the valve plate (4) away from the pressure plate (7); the circumferential side of the first elastic tube (33) is fixedly connected to the valve plate (4); and the pull rope (13) is fixedly passed through the first elastic tube (33).

10. A high sealing performance butterfly valve according to claim 1, characterized in that: A second elastic tube (34) is fixedly mounted between the valve plate (4) and the pressure plate (7), and the sealing ring (6) is sleeved on the second elastic tube (34).

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