Eccentric butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, in particular to an eccentric butterfly valve which comprises an eccentric valve body, a butterfly valve plate, a valve rod, a movable brake block and a transmission assembly, a water flowing cavity is formed in the eccentric valve body, the valve rod is rotationally installed on the eccentric valve body, the butterfly valve plate is rotationally installed on the valve rod, a sealing ring is fixedly installed on the butterfly valve plate, and the movable brake block is fixedly installed on the sealing ring. The sealing ring is attached to the water flowing cavity, two through holes are formed in the butterfly valve plate, two movable brake blocks corresponding to the through holes are installed on the butterfly valve plate in a sliding mode, and the transmission assembly is connected with the valve rod and the movable brake blocks at the same time. The through hole is formed in the butterfly valve plate, the movable brake block corresponding to the through hole is arranged, the movable brake block is controlled to change the opening and closing state of the through hole, impact force borne by the two sides of the butterfly valve plate from liquid when the butterfly valve plate rotates to open the water flowing cavity is reduced, the service life of the butterfly valve plate is prolonged, and the maintenance frequency of the eccentric butterfly valve is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, in particular to an eccentric butterfly valve. Background Art

[0002] Butterfly valve, also known as flap valve, is a regulating valve with a simple structure. It can be used for on-off control of low-pressure pipeline media. Butterfly valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It is widely used in various industrial pipeline systems, especially in occasions that require high sealing and ground friction. Butterfly valves are mainly composed of three parts: valve body, valve stem and butterfly plate. The valve body is the main part of the butterfly valve, providing installation and support. The valve stem is the part that connects the butterfly plate and the drive device. The butterfly plate is driven by rotating the valve stem. The butterfly plate is the part that directly contacts the medium and rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating. The butterfly valve has a simple structure, small size, light weight and high material consumption. It is economical, has a small installation size, a small driving torque, is easy and quick to operate, and has good flow regulation function and closing and sealing characteristics. The eccentric butterfly valve refers to a butterfly valve in which the valve stem axis deviates from the center of the disc plate and the center of the body at the same time, and the sealing pair is a beveled cone. The eccentric setting can reduce the friction and extrusion between the butterfly plate and the valve body, and improve the sealing effect. However, when the butterfly plate in the butterfly valve is closing and opening, the liquid in the pipe will impact the butterfly plate, causing both sides of the butterfly plate to be subjected to a large impact force, which will affect the working effect of the butterfly plate and the valve stem over time. At the same time, because both sides of the butterfly plate are subjected to a large impact force, when closing and opening the butterfly plate, a larger force is required to offset the impact force on the butterfly plate in order to close and open the butterfly plate, thereby affecting the effect of opening or closing the butterfly plate.

[0003] In order to prevent the butterfly plate in the butterfly valve from being impacted by the liquid in the pipe on both sides during the opening and closing process, resulting in impact force on both sides of the butterfly plate, thereby affecting the working effect of the butterfly plate and the valve stem, the invention patent with application number CN202111270989.4 provides an eccentric butterfly valve. The invention provides an eccentric butterfly valve by setting a driving device, a valve body, a valve stem, a butterfly plate and a valve seat. A threaded hole is opened inside the valve stem, and a rectangular rod is provided in the threaded hole. A pressure block is sleeved on the rectangular rod. The pressure block is threadedly sealed to the inner wall of the threaded hole. The side of the pressure block away from the driving device is connected to the threaded hole. Hydraulic oil is injected between the bottoms of the holes, through holes are symmetrically provided on the butterfly plate near the valve stem, a baffle is connected to the valve stem sliding seal, the rectangular rod in the threaded hole and the pressure block sleeved on the rectangular rod cooperate with the through hole on the butterfly plate and the baffle, so that when the butterfly plate is closed or opened, the impact force of the liquid on both sides of the butterfly plate can be reduced, thereby improving the use effect of the butterfly plate and extending the service life of the butterfly plate, so that there is no need to use a lot of force to close or open the butterfly plate, but the use of hydraulic oil to control the opening and closing of the baffle will not only increase the production cost, but also increase the difficulty of maintenance of the eccentric butterfly valve.

[0004] Therefore, in order to avoid the impact force of the liquid on both sides of the butterfly plate in the butterfly valve during the closing and opening process, affecting the working effect of the butterfly plate and the valve stem, and at the same time reducing the force required to open and close the butterfly plate, an eccentric butterfly valve is proposed. Summary of the Invention

[0005] The object of the present invention is to provide an eccentric butterfly valve, in order to prevent the butterfly plate in the butterfly valve from being impacted by the liquid in the pipe during the closing and opening process, resulting in the impact force on both sides of the butterfly plate, which will affect the working effect of the butterfly plate and the valve stem over time. At the same time, because the two sides of the butterfly plate are subjected to a large impact force, a larger force is required to offset the impact force on the butterfly plate when closing and opening the butterfly plate, thereby affecting the effect of opening or closing the butterfly plate. By providing a through hole in the butterfly valve plate and arranging a movable gate block to slide with the through hole, when the butterfly valve plate needs to be opened or closed, the through hole is first opened or closed by rotating the valve stem, and the rotation of the butterfly valve plate is controlled to make the water flow in the pipeline flow out from the through hole first, thereby reducing the impact force on the butterfly valve plate when it rotates, avoiding the large impact force on both sides of the butterfly valve plate affecting the working effect of the butterfly valve plate and the valve stem, and prolonging the service life of the butterfly valve plate. At the same time, the force required to rotate the butterfly valve plate is reduced, and the opening and closing effect of the butterfly valve plate is improved.

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

[0007] An eccentric butterfly valve comprises an eccentric valve body, a butterfly valve plate, a valve stem, a movable gate block and a transmission assembly, the eccentric valve body and the butterfly valve plate are both arranged in a circular shape, a circular water flow chamber is provided inside the eccentric valve body, the butterfly valve plate is located in the water flow chamber, the valve stem is rotatably mounted on the eccentric valve body and passes through the upper and lower ends of the eccentric valve body, two bushings are symmetrically arranged on the butterfly valve plate, the butterfly valve plate is rotatably mounted on the valve stem through the bushings, a sealing ring is fixedly mounted on the butterfly valve plate, the sealing ring is arranged in a conical shape, the sealing ring is fitted with the side wall of the water flow chamber, two through holes are symmetrically provided on the butterfly valve plate, two movable gate blocks corresponding to the through holes are slidably mounted on the butterfly valve plate, the transmission assembly is simultaneously connected to the valve stem and the movable gate block, and the transmission assembly controls the opening and closing of the through hole by the movable gate block through the rotation of the valve stem.

[0008] By setting the eccentric valve body and the butterfly valve plate to be circular, the butterfly valve plate is installed in the eccentric valve body through the rotation of the valve stem, and the rotation of the valve stem controls the opening and closing of the water flow chamber. When the valve stem and the eccentric valve body are installed, the center line of the valve stem rotation deviates from the center line of the valve seat by a certain distance to ensure the integrity of the sealing surface. When the valve stem and the butterfly valve plate are installed, the center line of the valve stem rotation deviates from the center line of the butterfly valve plate by a certain distance, reducing the friction between the butterfly valve plate and the sealing ring when opening and closing. When the sealing ring is set on the butterfly valve plate, the center line of the eccentric valve body deviates from the center line of the conical sealing surface of the butterfly valve plate by a certain angle, so that when the butterfly valve plate is opened or closed, the butterfly valve sealing ring and the butterfly valve plate are quickly separated or contacted, and there is no friction or jamming between the sealing pairs. The triple eccentric setting increases the flow diameter of the valve, the valve has a higher flow rate, and the valve shaft does not need to sit at a large angle when the butterfly valve plate is opened and closed. The rotation of the valve shortens the opening and closing time of the valve and can achieve quick closing. The through holes are on both sides of the butterfly valve plate axis, and the moving gate block completely covers the through holes. When the water flow chamber needs to be opened, the valve stem is rotated. The valve stem will first cause the transmission assembly to drive the moving gate block to move in the horizontal direction. After the moving gate block slides, the through hole is opened. At this time, the liquid will flow out from the through hole first, and the valve stem continues to rotate to drive the butterfly valve plate to rotate to open the water flow chamber, and the liquid flows out from the water flow chamber. The liquid flows out from the through hole first, which reduces the impact force from the liquid on both sides of the butterfly valve plate when the butterfly valve plate is rotated to open the water flow chamber, avoids the butterfly valve plate and the valve stem from being affected by the liquid impact force when working for a long time, improves the service life of the butterfly valve plate, reduces the maintenance frequency of the eccentric butterfly valve, and the design and production cost of the mechanical transmission is lower than that of the hydraulic transmission, thereby improving the economy of the eccentric butterfly valve.

[0009] The driving member is a pair of opposing sides respectively provided with a pair of opposing sides respectively provided with a pair of opposing sides respectively provided with a pair of opposing sides respectively provided with a pair of opposing sides respectively meshing with each other with the opposing side of the two guiding paths and the guiding of the guiding paths.

[0010] By arranging two fixed seats on the butterfly valve plate, the opening and closing of the through hole is realized when the movable gate block moves horizontally on the fixed seat. The baffle is used to limit the movement of the movable gate block in the front and rear directions. The connecting groove and the rack matching groove are both set to be rectangular and are both located on the same side wall of the fixed seat. The upper end of the "E"-shaped connecting plate protrudes and is clamped in the rack matching groove, so that the rack can move horizontally on the fixed seat. The middle protrusion of the "E"-shaped connecting plate passes through the connecting groove and is fixedly connected to the upper end of the movable gate block. When the rack moves The movable gate block is driven to move horizontally in the gate block sliding groove. The area of ​​the arc groove is larger than that of the arc clamping block. The arc clamping block can rotate along its own axis in the arc groove. When the water flow chamber is in a closed state, the arc clamping block is located on the side wall of the arc groove close to one direction of the rack. When the water flow chamber needs to be opened and the butterfly valve plate is rotated, the valve stem is rotated first. At this time, the arc clamping block rotates from the side wall of the arc groove close to one direction of the rack to the other side wall of the arc groove. The valve stem cannot drive the butterfly valve plate to rotate, and the gear on the valve stem rotates around its own axis, driving the rack to rotate horizontally. The gear moves in the same direction, and the rack 1 makes the two moving gate blocks move in the same direction. The moving gate block moves horizontally in the gate block sliding groove and moves relative to the baffle. The moving gate block opens the blocked through hole. After the liquid flows out of the through hole, the arc-shaped clamping block fits with the other side wall of the arc groove. At this time, the valve stem is continuously rotated, and the valve stem can drive the butterfly valve plate to rotate to open the water flow chamber. When the water flow chamber needs to be closed, the valve stem is rotated in the opposite direction. The valve stem first drives the gear to move the rack 1, and the rack 1 drives the moving gate block to close the two through holes. When the through hole is closed, the arc clamping block fits with the other side wall of the arc groove. After the block rotates from one end of the arc groove to the other end, the valve stem drives the butterfly valve plate to rotate. After the sealing ring is completely fitted with the side wall of the water flow chamber, the butterfly valve plate closes the water flow chamber. Rotating the valve stem can control the closing of the through hole and the water flow chamber, ensuring that the liquid can flow out of the through hole before opening the water flow chamber, reducing the impact force brought by the liquid when rotating the butterfly valve plate, and at the same time reducing the force required to rotate the butterfly valve plate, thereby improving the opening and closing effect of the butterfly valve plate. Compared with hydraulic transmission, gear rack transmission saves production costs and is also convenient for the maintenance of eccentric butterfly valves.

[0011] Preferably, a fastening groove is provided on the fixing seat, and the fastening groove is arranged at both ends of the rack mating groove and is connected to the rack mating groove. The width of the fastening groove is smaller than the rack mating groove. The end of the connecting plate is made of rubber material, and the width of the end of the connecting plate is 1-2 mm larger than the width of the fastening groove. The end of the connecting plate is slidably fitted with the fastening groove.

[0012] By providing a fastening groove on the rack mating groove, when the butterfly valve plate closes the water flow chamber, the end of the connecting plate is located in the fastening groove. When the butterfly valve plate is rotated to open the water flow chamber, the connecting plate moves from one end of the rack mating groove to the other end, and the end of the connecting plate is inserted into the fastening groove again. Since the end of the connecting plate is made of rubber material and its width is greater than the fastening groove, the end of the connecting plate is squeezed and deformed and inserted into the fastening groove, thereby increasing the friction between the two and improving the fastening effect. The fastening groove fixes the connecting plate and the rack at the same time, avoiding the shaking of the transmission assembly when impacted by water flow due to the gap between the teeth of the gear and the rack, thereby improving the stability of the transmission assembly.

[0013] Preferably, a horizontal groove is provided on the butterfly valve plate, the horizontal groove is located below the fixed seat and is connected to the gate block sliding groove, a horizontal plate is slidably installed in the horizontal groove, two support rods are provided on the horizontal plate, the support rods are arranged in an inclined shape and abut against the side wall of the movable gate block, a rack 2 is provided at one end of the horizontal plate, the rack 2 is located below the gear and meshes with the gear, and when the valve stem rotates, the rack 2 moves together with the rack.

[0014] By setting a horizontal groove under the fixed seat, the horizontal groove connects the two gate block sliding grooves, and the support rod is slightly higher than the side wall of the gate block sliding groove. When the gear drives rack 1 to move in the horizontal direction and the connecting plate drives the two moving gate blocks to move in the same direction, rack 2 engaged with the gear also moves at the same time, and rack 2 drives the support rod to move. The end of the support rod is always in contact with the side wall of the moving gate block, providing the moving gate block with a thrust toward the baffle. The thrust can reduce the pressure of the liquid in the vertical direction of the moving gate block, thereby reducing the friction between the moving gate block and the side wall of the gate block sliding groove, and further improving the opening and closing effect of the butterfly valve plate.

[0015] Preferably, the side wall where the movable brake block abuts the support rod is set to a plane, and the end where the support rod abuts the movable brake block is set to a plane. When the movable brake block slides, the support rod moves in the same direction, and the end of the support rod is always in contact with the side wall of the movable brake block.

[0016] By setting the end of the support rod and the side wall of the movable brake block to be flat, the original point-to-surface contact is changed to plane-to-plane contact, thereby increasing the contact area between the support rod and the movable brake block, so that the thrust of the support rod is evenly applied to the side wall of the movable brake block, avoiding the stress concentration caused by point-to-surface contact and improving the service life of the support rod and the movable brake block.

[0017] Preferably, both ends of the fixed seat and the movable brake block are provided with chamfered corners, one side of the chamfered arc is close to the baffle, and the bottom of the chamfered corner of the movable brake block is in contact with the side wall of the butterfly valve plate.

[0018] By setting chamfers at both ends of the movable gate block, when the valve stem rotates the butterfly valve plate to open the water flow chamber, the butterfly valve plate as a whole is parallel to the direction of liquid flow. At this time, the fixed seat and the movable gate block are also parallel to the direction of liquid flow. The liquid will impact the fixed seat and the ends of the movable gate block. Compared with the vertical plane, the impact force of the liquid flowing through the rounded corners will be relatively reduced, thereby reducing the vibration of the transmission assembly and further improving the stability of the transmission assembly.

[0019] Preferably, the baffle is provided with an inclined slope, which is in the same direction as the sliding direction of the movable brake block, and the inclined slope causes the cross section of the brake block sliding groove to change from small to large.

[0020] By providing an inclined slope on the baffle, when the connecting plate has not yet driven the movable brake block to slide, the movable brake block is located at the top of the inclined slope in the brake block sliding groove. At this time, the cross-section of the brake block sliding groove is the same as the width of the movable brake block, and the movable brake block cannot move in the longitudinal direction. When the connecting plate drives the movable brake block to slide, the movable brake block and the inclined slope move relative to each other. When the support rod applies thrust to the movable brake block, the movable brake block can move in the longitudinal direction, thereby improving the matching stability between the movable brake block and the fixed seat.

[0021] Preferably, a sealing sheet is fixedly mounted on the movable gate block, the sealing sheet is in contact with the side wall of the butterfly valve plate, a square protrusion is provided in the middle of the sealing sheet, the area of ​​the square protrusion is the same as the area of ​​the through hole, and the square protrusion of the sealing sheet is in sliding fit with the through hole.

[0022] By fixing the sealing sheet on the movable gate block and the square protrusion of the sealing sheet being stuck in the through hole, liquid is prevented from flowing out of the through hole when the movable gate block closes the through hole, thereby improving the sealing effect of the movable gate block and enhancing the reliability of the sealing structure.

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

[0024] 1. By opening a through hole on the butterfly valve plate and setting a movable gate block corresponding to the through hole, the movable gate block is controlled to change the opening and closing state of the through hole. When the butterfly valve plate needs to be rotated, the liquid will flow out from the through hole first, reducing the impact force from the liquid on both sides of the butterfly valve plate when the butterfly valve plate is rotated to open the water flow chamber, avoiding the butterfly valve plate and the valve stem from being affected by the liquid impact force during long-term operation, thereby improving the service life of the butterfly valve plate and reducing the maintenance frequency of the eccentric butterfly valve. In addition, the design and production cost of the mechanical transmission is lower than that of the hydraulic transmission, thereby improving the economy of the eccentric butterfly valve.

[0025] 2. By rotating the valve stem to control the moving gate block to open the through hole, and then the butterfly valve plate to open the water flow chamber, it is ensured that the liquid can flow out of the through hole before opening the water flow chamber, reducing the impact force brought by the liquid when rotating the butterfly valve plate, and at the same time reducing the force required to rotate the butterfly valve plate, thereby improving the opening and closing effect of the butterfly valve plate. Compared with hydraulic transmission, the gear rack drive saves production costs and is also convenient for the maintenance of the eccentric butterfly valve.

[0026] 3. By opening a horizontal groove on the butterfly valve plate, a support rod is set in the horizontal groove. The support rod provides a thrust for the moving gate block toward the baffle. The thrust can reduce the pressure of the liquid in the vertical direction of the moving gate block, thereby reducing the friction between the moving gate block and the side wall of the gate block sliding groove, further improving the opening and closing effect of the butterfly valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the butterfly valve plate structure of the present invention;

[0029] Figure 3 A schematic diagram of opening a through hole according to the present invention;

[0030] Figure 4 This is a schematic diagram of the rotation of the butterfly valve plate of the present invention;

[0031] Figure 5 A schematic diagram of setting an inclined slope for the baffle of the present invention;

[0032] Figure 6 It is a schematic diagram of the transmission assembly structure connection of the present invention;

[0033] Figure 7 This is a schematic diagram of the cooperation between the support rod and the movable brake block of the present invention;

[0034] Figure 8 It is a bottom view of the butterfly valve plate of the present invention.

[0035] In the figure: 1. Eccentric valve body; 11. Water flow chamber; 2. Butterfly valve plate; 21. Bushing; 22. Through hole; 23. Arc groove; 24. Horizontal groove; 25. Horizontal plate; 26. Support rod; 27. Rack 2; 3. Valve stem; 31. Arc clamping block; 4. Movable gate block; 41. Chamfered corner; 5. Transmission assembly; 51. Gear; 52. Rack 1; 53. Fixed seat; 531. Baffle; 532. Gate block sliding groove; 533. Connecting groove; 534. Rack matching groove; 535. Fastening groove; 54. Connecting plate; 6. Sealing piece. DETAILED DESCRIPTION

[0036] See also Figures 1 to 8 The present invention provides an eccentric butterfly valve, and the technical solution is as follows:

[0037] An eccentric butterfly valve includes an eccentric valve body 1, a butterfly valve plate 2, a valve stem 3, a movable gate block 4 and a transmission assembly 5. The eccentric valve body 1 and the butterfly valve plate 2 are both arranged in a circular shape. A circular water flow chamber 11 is opened inside the eccentric valve body 1. The butterfly valve plate 2 is located in the water flow chamber 11. The valve stem 3 is rotatably mounted on the eccentric valve body 1 and passes through the upper and lower ends of the eccentric valve body 1. Two bushings 21 are symmetrically arranged on the butterfly valve plate 2. The butterfly valve plate 2 is rotatably mounted on the valve stem 3 through the bushings 21. A sealing ring is fixedly mounted on the butterfly valve plate 2. The sealing ring is arranged in a conical shape. The sealing ring fits against the side wall of the water flow chamber 11. The rotation of the valve stem 3 controls the opening and closing of the water flow chamber 11. When the valve stem 3 is installed with the eccentric valve body 1, the rotation center line of the valve stem 3 deviates from the center line of the valve seat by a certain distance to ensure sealing. The integrity of the surface, when the valve stem 3 and the butterfly valve plate 2 are installed, the rotation center line of the valve stem 3 deviates from the center line of the butterfly valve plate 2 by a certain distance, reducing the friction between the butterfly valve plate 2 and the sealing ring when opening and closing. When the sealing ring is set on the butterfly valve plate 2, the center line of the eccentric valve body 1 deviates from the center line of the conical sealing surface of the butterfly valve plate 2 by a certain angle, so that when the butterfly valve plate 2 is opened or closed, the butterfly valve sealing ring and the butterfly valve plate 2 are quickly separated or contacted, and there is no friction or jamming between the sealing pairs. The setting of the three eccentrics increases the flow diameter of the valve, and the valve has a higher flow rate. When the butterfly valve plate 2 is opened and closed, the valve shaft does not need to rotate at a large angle, which shortens the opening and closing time of the valve and can achieve rapid closing. Two through holes 22 are symmetrically provided on the butterfly valve plate 2, and a sliding member corresponding to the through hole 22 is installed on the butterfly valve plate 2 The two movable gate blocks 4, the transmission assembly 5 is connected to the valve stem 3 and the movable gate block 4 at the same time, and the transmission assembly 5 controls the opening and closing of the through hole 22 by the rotation of the valve stem 3. The through hole 22 is on both sides of the axis of the butterfly valve plate 2, and the movable gate block 4 completely fits and covers the through hole 22. When the water flow chamber 11 needs to be opened, the valve stem 3 is rotated. The valve stem 3 will first cause the transmission assembly 5 to drive the movable gate block 4 to move in the horizontal direction. After the movable gate block 4 slides, it will open the through hole 22. At this time, the liquid will first flow out from the through hole 22, and the valve stem 3 continues to rotate to drive the butterfly valve plate 2 to rotate and open the water flow chamber 11, and the liquid then flows out of the water flow chamber 11. The liquid flows out from the through hole 22 first, which reduces the impact of the liquid on both sides of the butterfly valve plate 2 when the butterfly valve plate 2 is rotated to open the water flow chamber 11. The impact force is avoided, which prevents the butterfly valve plate 2 and the valve stem 3 from being affected by the liquid impact force when working for a long time, thereby improving the service life of the butterfly valve plate 2 and reducing the maintenance frequency of the eccentric butterfly valve. The design and production cost of the mechanical transmission is lower than that of the hydraulic transmission, which improves the economy of the eccentric butterfly valve. The transmission assembly 5 includes a gear 51, a rack 52 and a fixed seat 53. Two fixed seats 53 are arranged on both sides of the axis of the butterfly valve plate 2. Two baffles 531 are symmetrically installed on the fixed seat 53. The baffles 531 are used to limit the movement of the movable gate block 4 in the front and rear directions. A gate block sliding groove 532 is opened in the fixed seat 53. The movable gate block 4 is slidably installed in the gate block sliding groove 532. One side wall of the movable gate block 4 is in contact with the baffle 531, and the other side wall is in contact with the side wall of the butterfly valve plate 2.The fixing seat 53 is provided with a connecting groove 533, which is connected to the brake block sliding groove 532. A rack matching groove 534 is provided next to the connecting groove 533. The connecting groove 533 and the rack matching groove 534 are both set to be rectangular and are both located on the same side wall of the fixing seat 53. Connecting plates 54 are fixedly installed at both ends of the rack 1 52. The connecting plates 54 are set to be in an "E" shape. The upper end of the "E"-shaped connecting plate 54 protrudes and is snapped into the rack matching groove 534, so that the rack 1 52 can move horizontally on the fixing seat 53. The middle protrusion of the "E"-shaped connecting plate 54 passes through the connecting groove 533 and is fixedly connected to the upper end of the movable brake block 4, driving the movable brake block 4 to slide on the brake block when the rack moves. The groove 532 moves horizontally, the gear 51 is fixedly sleeved on the valve stem 3, the rack 52 is located above the gear 51 and meshes with the gear 51, an arc groove 23 is provided in the bushing 21, and an arc block 31 is fixedly installed on the valve stem 3, the arc block 31 slides with the arc groove 23, the area of ​​the arc groove 23 is larger than the area of ​​the arc block 31, and the arc block 31 can rotate along its own axis in the arc groove 23. When the water flow chamber 11 is in a closed state, the arc block 31 is located on the side wall of the arc groove 23 close to the direction of the rack 52. When the water flow chamber 11 needs to be opened and the butterfly valve plate 2 is rotated, the valve stem 3 is rotated first. At this time, the arc block 31 rotates from the side wall of the arc groove 23 close to the direction of the rack 52 to On the other side wall of the arc groove 23, the valve stem 3 cannot drive the butterfly valve plate 2 to rotate, and the gear 51 on the valve stem 3 rotates around its own axis, driving the rack 1 52 to move in the horizontal direction. The rack 1 52 causes the two movable gate blocks 4 to move in the same direction. The movable gate block 4 moves horizontally in the gate block sliding groove 532 and moves relative to the baffle 531. The movable gate block 4 opens the blocked through hole 22. After the liquid flows out of the through hole 22, the arc block 31 fits with the other side wall of the arc groove 23. At this time, the valve stem 3 is continuously rotated, and the valve stem 3 can drive the butterfly valve plate 2 to rotate, opening the water flow chamber 11. When the water flow chamber 11 needs to be closed, the valve stem 3 is rotated in the opposite direction. The valve stem 3 first causes the gear 51 to drive the rack 1 52 to move The rack 52 drives the movable gate block 4 to close the two through-holes 22. When the through-holes 22 are closed, the arc-shaped block 31 rotates from one end of the arc groove 23 to the other end, and the valve stem 3 drives the butterfly valve plate 2 to rotate. After the sealing ring is completely in contact with the side wall of the water flow chamber 11, the butterfly valve plate 2 closes the water flow chamber 11. Rotating the valve stem 3 can control the closing of the through-holes 22 and the water flow chamber 11, ensuring that the liquid can flow out of the through-holes 22 before opening the water flow chamber 11. This reduces the impact force caused by the liquid when rotating the butterfly valve plate 2, and at the same time reduces the force required to rotate the butterfly valve plate 2, improving the opening and closing effect of the butterfly valve plate 2. Compared with hydraulic transmission, the rack drive of the gear 51 saves production costs and also facilitates the maintenance of eccentric butterfly valves.

[0038] As an embodiment of the present invention, refer to Figures 6 to 8, a fastening groove 535 is provided on the fixing seat 53, and the fastening groove 535 is arranged at both ends of the rack matching groove 534 and is connected to the rack matching groove 534. The width of the fastening groove 535 is smaller than the rack matching groove 534. The end of the connecting plate 54 is made of rubber material, and the width of the end of the connecting plate 54 is 1-2mm larger than the width of the fastening groove 535. The end of the connecting plate 54 slides with the fastening groove 535. When the butterfly valve plate 2 closes the water flow chamber 11, the end of the connecting plate 54 is located in the fastening groove 535. When the butterfly valve plate 2 is rotated to open the water flow chamber 11, the connecting plate 54 moves from one end of the rack matching groove 534 to the other end, and the end of the connecting plate 54 is inserted into the fastening groove 535 again. The cam 532 is a substantially parallel plate 54 that is formed on the underside of the gear 51 and the underside of the gear 52. The cam 532 is a substantially parallel plate 54 that is formed on the underside of the gear 51 and the underside of the gear 52. The cam 532 is a substantially parallel plate 54 that is formed on the underside of the gear 51 and the underside of the gear 52. The cam 532 is a substantially parallel plate 54 that is formed on the underside of the gear 51 and the underside of the gear 52. Then, a rack 27 is provided at one end of the horizontal plate 25. The rack 27 is located below the gear 51 and meshes with the gear 51. When the valve stem 3 rotates, the rack 27 moves in the same direction as the rack 1 52. The horizontal groove 24 is connected to the two gate block sliding grooves 532. The support rod 26 is slightly higher than the side wall of the gate block sliding groove 532. When the gear 51 drives the rack 1 52 to move in the horizontal direction and the connecting plate 54 drives the two moving gate blocks 4 to move in the same direction, the rack 27 meshing with the gear 51 also moves at the same time, and the rack 27 drives the support rod 26 to move. The end of the support rod 26 is always in contact with the side wall of the moving gate block 4, providing the moving gate block 4 with a thrust toward the baffle 531. The thrust can reduce the vertical liquid from the moving gate block 4. The pressure is applied, thereby reducing the friction between the moving gate block 4 and the side wall of the gate block sliding groove 532, further improving the opening and closing effect of the butterfly valve plate 2; the side wall of the moving gate block 4 and the support rod 26 are set to be flat, and the end of the support rod 26 and the moving gate block 4 is set to be flat. When the moving gate block 4 slides, the support rod 26 moves in the same direction, and the end of the support rod 26 is always in contact with the side wall of the moving gate block 4. The support rod 26 and the side wall of the moving gate block 4 are changed from point-to-surface contact to plane-to-plane contact, which increases the contact area between the support rod 26 and the moving gate block 4, so that the thrust of the support rod 26 is evenly applied to the side wall of the moving gate block 4, avoiding the stress concentration caused by point-to-surface contact, and improving the service life of the support rod 26 and the moving gate block 4;The end of the fixed seat 53 and the two ends of the movable gate block 4 are both provided with chamfered corners 41, and one side of the chamfered corner 41 is close to the baffle 531. The bottom of the chamfered corner 41 of the movable gate block 4 fits with the side wall of the butterfly valve plate 2. When the valve stem 3 rotates the butterfly valve plate 2 to open the water flow chamber 11, the butterfly valve plate 2 as a whole is parallel to the direction of liquid flow. At this time, the fixed seat 53 and the movable gate block 4 are also parallel to the direction of liquid flow. The liquid will impact the fixed seat 53 and the end of the movable gate block 4. Compared with the vertical plane, the impact force of the liquid flowing through the rounded corners will be relatively reduced, thereby reducing the vibration of the transmission component 5 and further improving the stability of the transmission component 5. An inclined slope is provided on the baffle 531, and the inclined slope is in the same sliding direction as the movable gate block 4. The inclined slope makes the cross section of the gate block sliding groove 532 change from small to large. When the connecting plate 54 has not yet driven the movable gate block 4 to slide, the movable gate block 4 The movable gate block 4 is located at the top of the inclined slope within the gate block sliding groove 532. At this time, the cross-section of the gate block sliding groove 532 is the same width as the movable gate block 4, and the movable gate block 4 cannot move in the longitudinal direction. When the connecting plate 54 drives the movable gate block 4 to slide, the movable gate block 4 and the inclined slope move relative to each other. When the support rod 26 applies thrust to the movable gate block 4, the movable gate block 4 can move in the longitudinal direction, thereby improving the matching stability between the movable gate block 4 and the fixed seat 53. A sealing plate 6 is fixedly mounted on the movable gate block 4. The sealing plate 6 is in contact with the side wall of the butterfly valve plate 2. A square protrusion is provided in the middle of the sealing plate 6. The area of ​​the square protrusion is the same as that of the through hole 22. The square protrusion of the sealing plate 6 slides with the through hole 22 to prevent liquid from flowing out of the through hole 22 when the movable gate block 4 closes the through hole 22, thereby improving the sealing effect of the movable gate block 4 and the reliability of the sealing structure.

[0039] Working principle: When it is necessary to open the water flow chamber 11 and rotate the butterfly valve plate 2, the valve stem 3 is rotated first. At this time, the arc-shaped block 31 rotates from the side wall of the arc groove 23 close to the rack 1 52 to the other side wall of the arc groove 23. The valve stem 3 cannot drive the butterfly valve plate 2 to rotate, and the gear 51 on the valve stem 3 rotates around its own axis, driving the rack 1 52 to move in the horizontal direction. The end of the connecting plate 54 is disengaged from the fastening groove 535, and the rack 1 52 causes the two moving gate blocks 4 to move in the same direction. The moving gate block 4 moves horizontally in the gate block sliding groove 532 and moves relative to the baffle 531. The rack 27 also moves at the same time, driving the support rod 26 to move. The end of the support rod 26 is always in contact with the side wall of the moving gate block 4, which is the moving gate block. 4 provides thrust toward the baffle 531, and the moving gate block 4 opens the blocked through hole 22. After the liquid flows out of the through hole 22, the arc-shaped block 31 fits with the other side wall of the arc groove 23. At this time, the valve stem 3 is continuously rotated, and the valve stem 3 can drive the butterfly valve plate 2 to rotate, opening the water flow chamber 11. When the water flow chamber 11 needs to be closed, the valve stem 3 is rotated in the opposite direction. The valve stem 3 first drives the gear 51 to drive the rack 1 52 to move, and the rack 1 52 drives the moving gate block 4 to close the two through holes 22. After the through hole 22 is closed, the arc-shaped block 3 rotates from one end of the arc groove 23 to the other end, and the valve stem 3 drives the butterfly valve plate 2 to rotate. After the sealing ring is completely fitted with the side wall of the water flow chamber 11, the butterfly valve plate 2 closes the water flow chamber 11.

[0040] A specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiment described above. For those skilled in the art, various changes, modifications, substitutions, and variations to 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. An eccentric butterfly valve, characterized in that: The invention comprises an eccentric valve body (1), a butterfly valve plate (2), a valve stem (3), a movable gate block (4) and a transmission assembly (5); the eccentric valve body (1) and the butterfly valve plate (2) are both arranged in a circular shape; a circular water flow cavity (11) is provided inside the eccentric valve body (1); the butterfly valve plate (2) is located in the water flow cavity (11); the valve stem (3) is rotatably mounted on the eccentric valve body (1) and passes through the upper and lower ends of the eccentric valve body (1); two bushings (21) are symmetrically arranged on the butterfly valve plate (2); the butterfly valve plate (2) is rotatably mounted on the eccentric valve body (1) through the bushings (21); A sealing ring is fixedly mounted on the valve stem (3) and the butterfly valve plate (2). The sealing ring is configured to be conical in shape and fits against the side wall of the water flow chamber (11). Two through holes (22) are symmetrically provided on the butterfly valve plate (2). Two movable gate blocks (4) corresponding to the through holes (22) are slidably mounted on the butterfly valve plate (2). The transmission assembly (5) is simultaneously connected to the valve stem (3) and the movable gate block (4). The transmission assembly (5) controls the movable gate block (4) through the mechanical transmission of the valve stem (3) to open and close the through hole (22).

2. The eccentric butterfly valve according to claim 1, characterized in that: The transmission assembly (5) includes a gear (51), a rack (52) and a fixed seat (53). Two fixed seats (53) are provided on both sides of the axis of the butterfly valve plate (2). Two baffles (531) are symmetrically installed on the fixed seat (53). A gate block sliding groove (532) is provided in the fixed seat (53). The movable gate block (4) is slidably installed in the gate block sliding groove (532). One side wall of the movable gate block (4) is in contact with the baffle (531), and the other side wall is in contact with the side wall of the butterfly valve plate (2). A connecting groove (533) is provided on the fixed seat (53). The connecting groove (533) is communicated with the gate block sliding groove (532). A rack matching groove (533) is provided next to the connecting groove (533). 34), connecting plates (54) are fixedly installed at both ends of the rack (52), and the connecting plates (54) are set in an "E" shape. The rack (52) is slidably installed on the fixed seat (53) through the connecting plate (54) and the rack matching groove (534). One end of the connecting plate (54) passes through the connecting groove (533) and is fixedly connected to the movable brake block (4). The gear (51) is fixedly installed on the valve stem (3), and the rack (52) is located above the gear (51) and meshes with the gear (51). An arc groove (23) is opened in the bushing (21), and an arc block (31) is fixedly installed on the valve stem (3), and the arc block (31) is slidably matched with the arc groove (23).

3. The eccentric butterfly valve according to claim 2, characterized in that: The fixing seat (53) is provided with a fastening groove (535), which is arranged at both ends of the rack matching groove (534) and is communicated with the rack matching groove (534). The width of the fastening groove (535) is smaller than that of the rack matching groove (534). The end of the connecting plate (54) is made of rubber material. The width of the end of the connecting plate (54) is 1-2 mm greater than the width of the fastening groove (535). The end of the connecting plate (54) is slidably matched with the fastening groove (535).

4. The eccentric butterfly valve according to claim 3, characterized in that: A horizontal groove (24) is provided on the butterfly valve plate (2), and the horizontal groove (24) is located below the fixed seat (53) and is connected to the gate block sliding groove (532). A horizontal plate (25) is slidably installed in the horizontal groove (24), and two support rods (26) are provided on the horizontal plate (25). The support rods (26) are arranged in an inclined shape and abut against the side wall of the movable gate block (4). A rack 2 (27) is provided at one end of the horizontal plate (25), and the rack 2 (27) is located below the gear (51) and meshes with the gear (51). When the valve stem (3) rotates, the rack 2 (27) and the rack 1 (52) move in the same direction.

5. The eccentric butterfly valve according to claim 4, characterized in that: The side wall where the movable brake block (4) abuts against the support rod (26) is set as a plane, and the end portion where the support rod (26) abuts against the movable brake block (4) is set as a plane. When the movable brake block (4) slides, the support rod (26) moves in the same direction, and the end portion of the support rod (26) is always in contact with the side wall of the movable brake block (4).

6. The eccentric butterfly valve according to claim 5, characterized in that: The end of the fixed seat (53) and both ends of the movable brake block (4) are provided with chamfered corners (41), one side of the arc of the chamfered corner (41) is close to the baffle (531), and the bottom of the chamfered corner (41) of the movable brake block (4) is in contact with the side wall of the butterfly valve plate (2).

7. The eccentric butterfly valve according to claim 6, characterized in that: The baffle (531) is provided with an inclined slope, which is in the same direction as the sliding direction of the movable brake block (4). The inclined slope causes the cross section of the brake block sliding groove (532) to change from small to large.

8. The eccentric butterfly valve according to claim 7, characterized in that: A sealing sheet (6) is fixedly mounted on the movable gate block (4), and the sealing sheet (6) is in contact with the side wall of the butterfly valve plate (2). A square protrusion is provided in the middle of the sealing sheet (6), and the area of ​​the square protrusion is the same as the area of ​​the through hole (22). The square protrusion of the sealing sheet (6) is in sliding engagement with the through hole (22).

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