A triple eccentric butterfly valve with compensated double sealing function

Abstract

This invention discloses a triple eccentric butterfly valve with a compensated double-seal function, belonging to the field of butterfly valve technology. It includes a valve body, valve shaft, valve core assembly, compensation assembly, flange tube, and control unit. The valve shaft and valve body are rotatably connected. There are two sets of flange tubes, each securely connected to one side of the valve body. The valve core assembly is located inside the valve body and is securely connected to the valve shaft. The compensation assembly is also securely connected to the valve core assembly. The control unit is securely connected to the upper end of the valve body. Multiple grooves are evenly distributed on the surface of the valve body. This invention compensates for the primary sealing effect by utilizing the change in water flow impact force during the butterfly plate closing process. This compensation reduces friction between the sealing ring and the butterfly plate during closing, and after the butterfly plate closes, the water pressure increases the compressive force between the butterfly plate and the sealing ring, greatly improving the sealing effect.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, specifically a triple eccentric butterfly valve with a compensated double sealing function. Background Technology

[0002] Butterfly valves, also known as flap valves, can be used to control the flow of fluids such as air, water, steam, various corrosive media, and mud. Triple eccentric butterfly valves are a prominent representative of the new generation of butterfly valves. Triple eccentric butterfly valves solve the problem that conventional centerline butterfly valves can only be used under low temperature and low pressure conditions. They transform the compression deformation seal of double eccentric butterfly valves into a torque seal, which greatly improves the sealing effect. However, existing triple eccentric butterfly valves still have shortcomings in other aspects.

[0003] Conventional triple eccentric butterfly valves experience water hammer during rapid closure. The reaction force of the water flow impacts the butterfly valve, significantly reducing its service life.

[0004] After the butterfly plate of the triple offset butterfly valve is closed, it is subjected to the pressure of the water flow. Due to the characteristics of the triple offset butterfly valve, the form of this pressure is torque, which will continue to act on the regulating worm gear. Although the worm gear structure achieves self-locking, the worm gear teeth apply pressure to the threads on the worm for a long time, which can easily lead to thread deformation and affect the normal operation of the butterfly valve.

[0005] Traditional triple offset butterfly valves are prone to wear on their sealing rings after repeated opening and closing, and leakage is likely to occur at the worn locations, but traditional equipment cannot provide corresponding compensation. Summary of the Invention

[0006] The purpose of this invention is to provide a triple eccentric butterfly valve with a compensated double sealing function to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a triple eccentric butterfly valve with a compensated double-seal function, comprising a valve body, a valve shaft, a valve core assembly, a compensation assembly, a flange tube, and a control unit. The valve shaft and valve body are rotatably connected. There are two sets of flange tubes, which are respectively fastened to both sides of the valve body. The valve core assembly is disposed inside the valve body and is fastened to the valve shaft. The compensation assembly is fastened to the valve core assembly. The control unit is fastened to the upper end of the valve body. The valve body surface is provided with grooves, and multiple grooves are evenly distributed on the valve body surface. The control unit controls the opening and closing of the valve core assembly. Water flows through the flange tube and then through the valve core assembly. The valve shaft transmits the torque of the control unit. The compensation assembly provides double-seal compensation for the butterfly valve. The grooves on the valve body surface reduce the weight of the valve body. This invention compensates for the primary sealing effect by changing the impact force of water flow during the butterfly valve closing process. This compensation reduces the friction between the sealing ring and the butterfly valve during the butterfly valve closing process, and after the butterfly valve closes, the pressure of the water flow increases the squeezing force between the butterfly valve and the sealing ring, which greatly improves the sealing effect. The butterfly valve provided in this application is designed for unidirectional flow control of water fluid.

[0008] Furthermore, the valve core assembly includes a butterfly plate, a valve seat, and a sealing ring. The butterfly plate is securely connected to the valve shaft, and the valve seat is securely connected to the valve body. The sealing ring is fitted onto the outer ring of the butterfly plate and is securely connected to the butterfly plate. The butterfly plate and valve seat of the triple eccentric butterfly valve are conventional techniques in this field, and their specific structures are not described. The valve shaft drives the butterfly plate to rotate, and the opening and closing state between the butterfly plate and the valve seat controls the output flow rate. The sealing ring provides a sealing function between the butterfly plate and the valve seat.

[0009] Furthermore, the compensation assembly includes a thrust plate, a pressure plate, a first compensation chamber, an annular pipe, and a compensation spring. The first compensation chamber is located at the center inside the butterfly plate. The thrust plate is fastened to the pressure plate via a connecting rod and is located on the outside of the butterfly plate. The pressure plate and the first compensation chamber are slidably connected. One end of the compensation spring is fastened to the pressure plate, and the other end is fastened to the first compensation chamber. The first compensation chamber is filled with water and is connected to the annular pipe via a pipe. The annular pipe is located inside the sealing ring. During the butterfly valve's closing action, the annular pipe is flattened. When the butterfly valve closes, the water pressure acts on the thrust plate, pushing the pressure plate. The pressure plate forces the water inside the first compensation chamber into the annular pipe, compensating for the sealing force of the sealing ring. This invention achieves compensation for the primary sealing effect by changing the water flow impact force during the butterfly plate's closing process. This compensation reduces the friction between the sealing ring and the butterfly plate during closing, and after the butterfly plate closes, the water pressure increases the squeezing force between the butterfly plate and the sealing ring, greatly improving the sealing effect.

[0010] Furthermore, the compensation assembly also includes a secondary sealing unit, which comprises a side push plate, a second compensation chamber, a compensation block, and a filling gap. Multiple sets of secondary sealing units are evenly distributed around the center of the butterfly valve. The side push plate is slidably connected to the outer surface of the butterfly valve. The second compensation chamber is embedded inside the butterfly valve. The compensation block and the second compensation chamber are slidably connected, and the compensation block and the side push plate are tightly connected. The filling gap is located within the sealing ring. The second compensation chamber is connected to the filling gap via a conduit, which contains a one-way inlet valve. The second compensation chamber is filled with water. When fluid leaks due to wear at a localized location on the sealing ring, the fluid inside the pipe tends to flow towards the leak location. This flow tendency acts on the side push plate for an extended period, causing the side push plate to move slowly. The compensation block slowly squeezes the water inside the second compensation chamber into the filling gap. The expansion of the filling gap compensates for the leak, thus achieving secondary sealing compensation for the butterfly valve. This invention compensates for leakage by compressing the leakage due to the flow trend caused by fluid leakage, reducing the impact of sealing ring wear on the sealing effect, decreasing the flow rate of the leaking fluid, and significantly extending the service life of the butterfly valve.

[0011] Furthermore, the flange pipe is internally equipped with multiple buffer components, which are evenly distributed around the flange pipe. Each buffer component includes a storage cavity, a sliding groove, an inner sliding plate, a piston plate, an outer sliding block, a first guide pipe, and a second guide pipe. The sliding groove is embedded in the side wall of the flange pipe and has a connecting section that connects to the inner wall surface of the flange pipe. The inner sliding plate is disposed in the sliding groove and is slidably connected to it. The outer sliding block is fastened to the inner sliding plate via the connecting section. The storage cavity is connected to the sliding groove, and multiple storage cavities are evenly distributed along the sliding groove. The piston plate is slidably connected to the storage cavity and fastened to the inner sliding plate. An input pipe is connected to one side of the storage cavity, and a one-way input valve is installed inside the input pipe, which is located away from the storage cavity. One end of the second guide pipe is connected to the first guide pipe, which is embedded inside the inner slide plate and the outer slide plate. The outer slide plate has inclined surfaces at both ends. The inclined surface on the side of the outer slide plate away from the valve core assembly opens towards the center of the flange pipe, while the inclined surface on the side of the outer slide plate closer to the valve core assembly opens towards the inner wall of the flange pipe. The end of the first guide pipe away from the input pipe is located on the inclined surface on the side of the outer slide plate away from the valve core assembly. One end of the second guide pipe is located on the inclined surface on the side of the outer slide plate closer to the valve core assembly, and the other end is located on the outer wall of the outer slide plate closer to the first guide pipe. An output pipe is also located on the side of the storage chamber closest to the input pipe. A one-way output valve is installed inside the output pipe. One end of the output pipe is connected to the storage chamber, and the other end is connected to the inner wall of the flange pipe. When the butterfly valve is open, water flows through the flange pipe, pushing the outer slide plate towards the side closer to the valve core assembly. The inner slide plate is driven by the outer slide plate, which in turn drives the piston plate. The piston plate slowly stores some water from the flange pipe through the first guide pipe into each storage chamber. Air that was originally present on the other side of the storage chamber is now discharged through the vent. When the butterfly valve suddenly closes, the water flow impacts the valve core assembly. After impacting the valve core assembly, the water flow flows back and pushes the outer slider in the opposite direction. The inclined surface of the outer slider, which is located near the valve core assembly, opens towards the inner wall of the flange pipe. The impact of the water flow flowing back squeezes into the wedge-shaped space here, and the resulting thrust is much greater than the thrust on the other side of the outer slider when it is in the conducting state. The outer slider is quickly reset, and the accumulated water flow is quickly ejected. The backflowing water is discharged through the second guide pipe to the center near the flange pipe inlet. The water inside the storage chamber is ejected towards the flange pipe inlet in multiple layers. During normal flow, this invention utilizes the resistance of the inclined surface to collect some water in the storage chamber. The opening of the inclined surface towards the center of the flange pipe reduces flow resistance. When the butterfly plate closes, the initial backlash force rapidly ejects the water inside the storage chamber, reducing and buffering the impact of subsequent water flow and preventing continuous water hammer. The second guide pipe also guides the water flow near the butterfly plate backflow. Combined with the stratified backflow of water in the storage chamber, the impact of water flow is intercepted in stages, dispersing the impact force at the butterfly plate position to various positions of this flange pipe, thus extending the service life of the butterfly valve.

[0012] Furthermore, the flange pipe also has a movable cavity inside, which is connected to a sliding groove. The end of the input pipe that connects to the inner sliding plate is located inside the movable cavity. The input pipe is a flexible hose, which moves with the inner sliding plate as it moves. The movable cavity provides space for the movement of the input pipe.

[0013] Furthermore, the control unit includes a cover, a rotating wheel, a worm gear, a worm, a central rod, and a fixed component. The rotating wheel and the worm are fastened together, the worm and the cover are rotatably connected, the central rod and the worm gear are fastened together, the central rod and the cover are rotatably connected, and the worm gear and the worm mesh. One end of the fixed component is connected to the central rod, and the other end of the fixed component is connected to the worm. The cover and the valve body are fastened together. Rotating the rotating wheel will drive the worm to rotate, the worm will drive the worm gear to rotate, the worm gear will drive the central rod to rotate, and the central rod is fastened to the valve shaft, thus driving the valve shaft to rotate.

[0014] Furthermore, the fixing components include an inner shaft, an outer sleeve, an annular disc, a connecting strip, a retaining tooth, a fixed disc, an annular groove, and a retaining tooth ring. The inner shaft and the outer sleeve are slidably connected. A return spring is installed inside the outer sleeve. One end of the return spring is fastened to the outer sleeve, and the other end of the return spring is fastened to the inner shaft. The inner shaft and the outer sleeve separate the worm gear. The inner shaft and the separated worm gear are fastened together. The annular disc is fitted on the outside of the outer sleeve. The annular disc and the outer sleeve are rotatably connected. The connecting strip is fastened to the annular disc. The retaining tooth is fastened to the end of the connecting strip away from the annular disc. The fixed disc is fastened to the center rod. The annular groove is arranged around the center of the fixed disc. The retaining tooth ring is fastened to the outer wall of the annular groove. There are retaining edges on both sides of the retaining tooth. The retaining teeth are close to the surface of the annular groove. The retaining edges on both sides of the retaining teeth prevent the annular disc from rotating with the outer sleeve. When rotating the outer sleeve, it is necessary to first press the outer sleeve, compressing the return spring. The outer sleeve then drives the annular disc to move closer to the inner shaft. The retaining teeth, originally engaged in the retaining tooth ring at a fixed angle, disengage when the annular disc moves, allowing the fixed disc to rotate. At this time, the butterfly valve can be adjusted. After adjustment, the outer sleeve resets under the action of the return spring, and the retaining teeth re-engage in the retaining tooth ring. The retaining tooth ring of this invention has multiple retaining grooves, the spacing of which corresponds to the open and closed states of the butterfly valve. This invention greatly reduces the load on the worm gear caused by water impact when the butterfly valve position is not adjusted. Part of the impact force is transmitted to the worm for radial compression, and the worm's ability to withstand radial compression is much greater than that of the worm gear teeth. Furthermore, the protection of the worm gear in this invention automatically resets after the butterfly valve is adjusted, eliminating the need for additional operation by the operator and preventing the impact caused by the operator forgetting to reset.

[0015] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: This invention compensates for the primary sealing effect by utilizing the change in water flow impact force during the butterfly valve's closing process. This compensation reduces friction between the sealing ring and the butterfly valve during closing, and after the butterfly valve closes, the water flow pressure increases the compressive force between the butterfly valve and the sealing ring, greatly improving the sealing effect. Furthermore, this invention compensates for leakage by utilizing the flow direction caused by fluid leakage, reducing the impact of sealing ring wear on the sealing effect, decreasing the flow rate of leaking fluid, and significantly extending the butterfly valve's service life. This invention utilizes the resistance of the inclined surface during normal flow to collect some water in the storage chamber. The opening of the inclined surface towards the center of the flange pipe reduces flow resistance. When the butterfly plate closes, the initial backlash force rapidly ejects the water from the storage chamber, reducing and buffering the impact of subsequent water flow and preventing continuous water hammer. The second guide pipe also guides the water flow near the butterfly plate backflow, working in conjunction with the stratified backflow of water in the storage chamber to segmentally intercept the water flow impact, distributing the impact force at the butterfly plate position to various locations within the flange pipe, thus extending the butterfly valve's service life. Furthermore, this invention significantly reduces the load on the worm gear caused by water impact when the butterfly valve position is not adjusted. Some of the impact force is transferred to the worm for radial compression, and the worm's ability to withstand radial compression is far greater than that of the worm gear teeth. Moreover, the worm gear protection mechanism automatically resets after butterfly valve adjustment, eliminating the need for additional operator intervention and preventing the impact of operator forgetting to reset. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a cross-sectional view of the internal structure of the flange pipe of the present invention in the butterfly valve closed state;

[0019] Figure 3 yes Figure 2 Enlarged view of a portion at point A;

[0020] Figure 4 This is a cross-sectional view of the internal structure of the flange pipe of the present invention in the butterfly valve open state;

[0021] Figure 5 This is a schematic diagram of the overall structure of the control unit of the present invention;

[0022] Figure 6 yes Figure 5 A magnified view of section B;

[0023] Figure 7 This is a top view of the fixed disk of the present invention;

[0024] Figure 8 This is a cross-sectional view of the overall structure of the valve core assembly of the present invention;

[0025] Figure 9 yes Figure 8 A magnified view of a portion at point C;

[0026] In the diagram: 1-Valve body, 2-Valve shaft, 3-Valve core assembly, 31-Butterfly plate, 32-Valve seat, 33-Sealing ring, 4-Compensation assembly, 41-Thrust plate, 42-Pressure plate, 43-First compensation chamber, 44-Annular pipe, 45-Compensation spring, 46-Secondary sealing unit, 461-Side push plate, 462-Second compensation chamber, 463-Compensation block, 464-Filling gap, 5-Flange pipe, 6-Control unit, 61-Cover cover, 62-Roller. 63-worm gear, 64-worm, 65-center rod, 66-fixed component, 661-inner shaft, 662-outer sleeve, 663-annular disc, 664-connecting bar, 665-clamping tooth, 666-fixed disc, 667-annular groove, 668-clamping tooth ring, 7-buffer assembly, 71-storage cavity, 72-sliding groove, 73-inner sliding plate, 74-piston plate, 75-outer slider, 76-first guide tube, 77-second guide tube, 78-moving cavity. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 , Figure 8As shown, a triple eccentric butterfly valve with a compensated double-seal function includes a valve body 1, a valve shaft 2, a valve core assembly 3, a compensation assembly 4, a flange pipe 5, and a control unit 6. The valve shaft 2 and the valve body 1 are rotatably connected. There are two sets of flange pipes 5, which are respectively fastened to the two sides of the valve body 1. The valve core assembly 3 is located inside the valve body 1 and is fastened to the valve shaft 2. The compensation assembly 4 is fastened to the valve core assembly 3. The control unit 6 is fastened to the upper end of the valve body 1. The surface of the valve body 1 is provided with grooves, and there are multiple grooves evenly distributed on the surface of the valve body 1. The control unit 6 controls the opening and closing of the valve core assembly 3. Water flows through the flange pipe 5 and then through the valve core assembly 3. The valve shaft 2 transmits the torque of the control unit 6. The compensation assembly 4 provides double-seal compensation for the butterfly valve. The grooves on the surface of the valve body 1 reduce the weight of the valve body 1. This invention compensates for the primary sealing effect by changing the impact force of water flow during the closing process of the butterfly plate 31. This compensation reduces the friction between the sealing ring 33 and the butterfly plate 31 during the closing process. After the butterfly plate is closed, the pressure of the water flow increases the squeezing force between the butterfly plate 31 and the sealing ring 33, which greatly improves the sealing effect.

[0029] like Figure 8 , Figure 9 As shown, the valve core assembly 3 includes a butterfly plate 31, a valve seat 32, and a sealing ring 33. The butterfly plate 31 is fastened to the valve shaft 2, and the valve seat 32 is fastened to the valve body 1. The sealing ring 33 is fitted onto the outer ring of the butterfly plate 31, and the sealing ring 33 is fastened to the butterfly plate 31. The butterfly plate 31 and valve seat 32 of the triple eccentric butterfly valve are conventional technologies in this field, and their specific structures are not described. The valve shaft 2 drives the butterfly plate 31 to rotate, and the opening and closing state between the butterfly plate 31 and the valve seat 32 controls the output flow. The sealing ring plays a sealing role between the butterfly plate 31 and the valve seat 32.

[0030] like Figure 8 , Figure 9As shown, the compensation assembly 4 includes a thrust plate 41, a pressure plate 42, a first compensation chamber 43, an annular pipe 44, and a compensation spring 45. The first compensation chamber 43 is located at the center inside the butterfly plate 31. The thrust plate 41 is fastened to the pressure plate 42 via a connecting rod and is located on the outside of the butterfly plate 31. The pressure plate 42 and the first compensation chamber 43 are slidably connected. One end of the compensation spring 45 is fastened to the pressure plate 42, and the other end is fastened to the first compensation chamber 43. The first compensation chamber 43 is filled with water and is connected to the annular pipe 44 via a pipe. The annular pipe 44 is located inside the sealing ring 33. During the closing action of the butterfly valve, the annular pipe 44 is flattened. When the butterfly valve is closed, the pressure of the water flow acts on the thrust plate 41, which pushes the pressure plate 42. The pressure plate 42 forces the water inside the first compensation chamber 43 into the annular pipe 44, compensating for the sealing force of the sealing ring 33. This invention compensates for the primary sealing effect by changing the impact force of water flow during the closing process of the butterfly plate 31. This compensation reduces the friction between the sealing ring 33 and the butterfly plate 31 during the closing process. After the butterfly plate is closed, the pressure of the water flow increases the squeezing force between the butterfly plate 31 and the sealing ring 33, which greatly improves the sealing effect.

[0031] like Figure 9 As shown, the compensation assembly 4 also includes a secondary sealing unit 46. The secondary sealing unit 46 includes a side push plate 461, a second compensation cavity 462, a compensation block 463, and a filling gap 464. Multiple sets of secondary sealing units 46 are provided and are evenly distributed around the center of the butterfly plate 31. The side push plate 461 is slidably connected to the outer surface of the butterfly plate 31. The second compensation cavity 462 is embedded inside the butterfly plate 31. The compensation block 463 is slidably connected to the second compensation cavity 462. The compensation block 463 and the side push plate 461 are fastened together. The filling gap 464 is provided in the sealing ring 33. The second compensation cavity 462 is connected to the filling gap 464 through a conduit. A one-way input valve is provided inside the conduit. The second compensation cavity 462 is filled with water. When fluid leaks due to wear at a localized location on the sealing ring 33, the fluid inside the pipe tends to flow towards the leak location. This flow tendency acts on the side push plate 461 for an extended period. As the side push plate 461 moves slowly, the compensation block 463 slowly squeezes the water inside the second compensation chamber 462 into the filling gap. The expansion of the filling gap compensates for the leak, thus achieving secondary sealing compensation for the butterfly valve. This invention compensates for the leak by compressing it through the flow tendency caused by fluid leakage, reducing the impact of the worn sealing ring 33 on the sealing effect, decreasing the flow rate of the leaking fluid, and significantly extending the service life of the butterfly valve.

[0032] like Figures 2-4As shown, a buffer assembly 7 is provided inside the flange pipe 5. Multiple buffer assemblies 7 are evenly distributed around the flange pipe 5. Each buffer assembly 7 includes a storage cavity 71, a sliding groove 72, an inner sliding plate 73, a piston plate 74, an outer sliding block 75, a first guide pipe 76, and a second guide pipe 77. The sliding groove 72 is embedded in the side wall of the flange pipe 5 and has a connecting section that connects to the inner wall surface of the flange pipe 5. The inner sliding plate 73 is disposed in the sliding groove 72 and is slidably connected to it. The outer sliding block 75 is fastened to the inner sliding plate 73 via the connecting section. The storage cavity 71 is connected to the sliding groove 72, and multiple storage cavities 71 are evenly distributed along the sliding groove 72. The piston plate 74 is slidably connected to the storage cavity 71 and fastened to the inner sliding plate 73. An input pipe is connected to one side of the storage cavity 71, and a one-way input valve is provided inside the input pipe. The end of the inlet pipe away from the storage cavity 71 is connected to the first guide pipe 76. The first guide pipe 76 is embedded inside the inner slide plate 73 and the outer slide block 75. The outer slide block 75 has inclined surfaces at both ends. The inclined surface on the side of the outer slide block 75 away from the valve core assembly 3 opens towards the center of the flange pipe 5, and the inclined surface on the side of the outer slide block 75 close to the valve core assembly 3 opens towards the inner wall of the flange pipe 5. The end of the first guide pipe 76 away from the inlet pipe is located on the inclined surface on the side of the outer slide block 75 away from the valve core assembly 3. One end of the second guide pipe 77 is located on the inclined surface on the side of the outer slide block 75 close to the valve core assembly 3, and the other end of the second guide pipe 77 is located on the outer wall of the outer slide block 75 close to the first guide pipe 76. The storage cavity 71 is also provided with an outlet pipe on the side close to the inlet pipe. A one-way outlet valve is provided inside the outlet pipe. One end of the outlet pipe is connected to the storage cavity 71, and the other end of the outlet pipe is connected to the inner wall of the flange pipe 5. When the butterfly valve is open, water flows through the flange pipe 5, pushing the outer slider 75 to move closer to the valve core assembly 3. The inner slide plate 73 is driven by the outer slider 75, which in turn drives the piston plate 74. The piston plate 74 slowly stores some of the water in the flange pipe 5 through the first guide pipe 76 into each storage chamber 71. The other side of the storage chamber 71 originally contained air, which is now discharged through the vent. When the butterfly valve is suddenly closed, the water flow impacts the valve core assembly 3. After impacting the valve core assembly 3, the water flow flows back, pushing the outer slider 75 in the opposite direction. The inclined surface of the outer slider 75, located near the valve core assembly 3, opens towards the inner wall of the flange pipe 5. The impact of the backflowing water squeezes into the wedge-shaped space here, generating a thrust much greater than the thrust on the other side of the outer slider 75 when it is open. The outer slider 75 is quickly reset, and the accumulated water flow is quickly ejected. The backflowing water is discharged through the second guide pipe 77 towards the center near the inlet of the flange pipe 5. The water inside the storage chamber 71 is ejected in multiple layers towards the inlet of the flange pipe 5.During normal flow, the present invention uses the resistance of the inclined surface to accumulate some water in the storage cavity 71. The opening of the inclined surface towards the center of the flange pipe 5 reduces the flow resistance. When the butterfly plate is closed, the water inside the storage cavity 71 is quickly ejected by the initial recoil force, which reduces the impact of subsequent water flow and avoids continuous water hammer. The second guide pipe 77 also guides the water flow near the butterfly plate back to flow. With the stratified backflow of water in the storage cavity 71, the impact of water flow is intercepted in stages, and the impact force at the butterfly plate position is distributed to various positions of the flange pipe 5, thus extending the service life of the butterfly valve.

[0033] like Figure 3 As shown, the flange pipe 5 also has a movable cavity 78 inside, which is connected to the sliding groove 72. One end of the input pipe connected to the inner slide plate 73 is located inside the movable cavity 78. The input pipe is a flexible hose, and when the inner slide plate 73 moves, the input pipe will move with the inner slide plate 73. The movable cavity 78 provides space for the movement of the input pipe.

[0034] like Figure 5 As shown, the control unit 6 includes a cover 61, a rotating wheel 62, a worm gear 63, a worm 64, a central rod 65, and a fixing component 66. The rotating wheel 62 and the worm 64 are fastened together, and the worm 64 and the cover 61 are rotatably connected. The central rod 65 and the worm gear 63 are fastened together, and the central rod 65 and the cover 61 are rotatably connected. The worm gear 63 and the worm 64 mesh. One end of the fixing component 66 is connected to the central rod 65, and the other end of the fixing component 66 is connected to the worm 64. The cover 61 and the valve body 1 are fastened together. Rotating the rotating wheel 62 will drive the worm 64 to rotate, the worm 64 will drive the worm gear 63 to rotate, the worm gear 63 will drive the central rod 65 to rotate, and the central rod 65 is fastened to the valve shaft 2, thus driving the valve shaft 2 to rotate.

[0035] like Figures 5-7As shown, the fixing component 66 includes an inner shaft 661, an outer sleeve 662, an annular disk 663, a connecting bar 664, a retaining tooth 665, a fixing disk 666, an annular groove 667, and a retaining tooth ring 668. The inner shaft 661 and the outer sleeve 662 are slidably connected. A return spring is provided inside the outer sleeve 662. One end of the return spring is fastened to the outer sleeve 662, and the other end of the return spring is fastened to the inner shaft 661. The inner shaft 661 and the outer sleeve 662 separate the worm gear 64. The inner shaft 661 and the separated... The worm gear 64 is fastened, the annular disc 663 is fitted on the outside of the outer sleeve 662, the annular disc 663 and the outer sleeve 662 are rotatably connected, the connecting strip 664 and the annular disc 663 are fastened, the retaining tooth 665 and the end of the connecting strip 664 away from the annular disc 663 are fastened, the fixed disc 666 and the center rod 65 are fastened, the annular groove 667 is set around the center of the fixed disc 666, the retaining tooth ring 668 and the outer wall of the annular groove 667 are fastened, and the retaining tooth 665 is provided with retaining edges on both sides. The retaining tooth 665 is close to the surface of the annular groove 667. The retaining edges on both sides of the retaining tooth 665 prevent the annular disk 663 from rotating with the outer sleeve 662. When rotating the outer sleeve 662, it is necessary to first press the outer sleeve 662, compressing the return spring. The outer sleeve 662 then moves the annular disk 663 towards the side closer to the inner shaft 661. The retaining tooth 665, originally engaged in the retaining tooth ring 668 at a fixed angle, disengages when the annular disk 663 moves, allowing the fixed disk 666 to rotate. At this time, the butterfly valve can be adjusted. After adjustment, the outer sleeve 662 returns to its original position under the action of the return spring, and the retaining tooth 665 re-engages in the retaining tooth ring 668. The retaining tooth ring 668 of this invention is provided with multiple retaining grooves, the spacing of which corresponds to the opening and closing states of the butterfly valve. This invention significantly reduces the load on the worm gear caused by water impact when the butterfly valve position is not adjusted by fixing the component. Part of the impact force is transmitted to the worm for radial compression, and the worm's ability to withstand radial compression is much greater than that of the worm gear teeth. On the other hand, the protection of the worm gear in this invention will automatically reset after the butterfly valve is adjusted, without the need for additional operation by the operator, thus eliminating the impact caused by the operator forgetting to reset.

[0036] The working principle of this invention is as follows: Rotating the wheel 62 causes the butterfly plate 31 to rotate, the butterfly valve is opened, and the water flows through the flange pipe 5, which pushes the outer slider 75 to move closer to the valve core assembly 3. The inner slide plate 73 is driven by the outer slider 75, and the inner slide plate 73 drives the piston plate 74. The piston plate 74 slowly stores part of the water in the flange pipe 5 through the first guide pipe 76 into each storage chamber 71. The other side of the storage chamber 71 originally contained air, which is now discharged through the exhaust port. When the butterfly valve suddenly closes, the water flow impacts the valve core assembly 3. After impacting the valve core assembly 3, the water flow flows back and pushes the outer slider 75 in the opposite direction. The inclined surface of the outer slider 75 near the valve core assembly 3 opens towards the inner wall of the flange pipe 5. The impact of the backflowing water squeezes into the wedge-shaped space here, and the resulting thrust is much greater than the thrust on the other side of the outer slider 75 when it is in the conducting state. The outer slider 75 is quickly reset, and the accumulated water flow is quickly ejected. The backflowing water is discharged through the second guide pipe 77 to the center near the inlet of the flange pipe 5. The water inside the storage chamber 71 is ejected into the inlet of the flange pipe 5 in multiple layers. At the butterfly plate position, the pressure of the water flow acts on the thrust plate 41. The thrust plate 41 pushes the pressure plate 42, and the pressure plate 42 forces the water inside the first compensation chamber 43 into the annular pipe 44 to compensate for the sealing force of the sealing ring 33. When fluid leaks due to wear at a local location of the sealing ring 33, the fluid inside the pipe tends to flow towards the leak location. This flow tendency acts on the side push plate 461 for a long time. The side push plate 461 moves slowly, and the compensation block 463 slowly squeezes the water inside the second compensation chamber 462 into the filling gap. The expansion of the filling gap compensates for the leak location, and the butterfly valve achieves secondary sealing compensation.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A triple eccentric butterfly valve with compensated double sealing function, characterized in that: The butterfly valve includes a valve body (1), a valve shaft (2), a valve core assembly (3), a compensation assembly (4), a flange tube (5), and a control unit (6). The valve shaft (2) and the valve body (1) are rotatably connected. There are two sets of flange tubes (5), and the two sets of flange tubes (5) are respectively fastened to the two sides of the valve body (1). The valve core assembly (3) is located inside the valve body (1). The valve core assembly (3) and the valve shaft (2) are fastened together. The compensation assembly (4) and the valve core assembly (3) are fastened together. The control unit (6) and the upper end of the valve body (1) are fastened together. The surface of the valve body (1) is provided with grooves. There are multiple grooves, and the multiple grooves are evenly distributed on the surface of the valve body (1). The flange tube (5) is equipped with a buffer assembly (7) inside. There are multiple sets of buffer assemblies (7), which are evenly distributed around the flange tube (5). The buffer assembly (7) includes a storage cavity (71), a sliding groove (72), an inner sliding plate (73), a piston plate (74), an outer sliding block (75), a first guide tube (76), and a second guide tube (77). The sliding groove (72) is embedded in the side wall of the flange tube (5). The sliding groove (72) is provided with a connecting section that connects to the inner wall surface of the flange tube (5). The inner sliding plate... (73) Set in the sliding groove (72), the inner slide plate (73) and the sliding groove (72) are slidably connected, the outer slide plate (75) is fastened to the inner slide plate (73) through the connecting section, the storage cavity (71) is connected to the sliding groove (72), the storage cavity (71) is provided with multiple storage cavities (71) and the multiple storage cavities (71) are evenly distributed along the sliding groove (72), the piston plate (74) and the storage cavity (71) are slidably connected, the piston plate (74) and the inner slide plate (73) are fastened to each other, and an input pipe is connected to one side of the storage cavity (71) for input. A one-way input valve is installed inside the inlet pipe. The end of the inlet pipe away from the storage cavity (71) is connected to the first guide pipe (76). The first guide pipe (76) is embedded inside the inner slide plate (73) and the outer slide plate (75). The outer slide plate (75) has inclined surfaces at both ends. The inclined surface on the side of the outer slide plate (75) away from the valve core assembly (3) opens towards the center of the flange pipe (5), and the inclined surface on the side of the outer slide plate (75) close to the valve core assembly (3) opens towards the inner wall of the flange pipe (5). The end of the first guide pipe (76) away from the inlet pipe is located at... An inclined surface is provided on the side of the outer slider (75) away from the valve core assembly (3). One end of the second guide tube (77) is provided on the inclined surface of the outer slider (75) near the valve core assembly (3). The other end of the second guide tube (77) is provided on the outer wall of the outer slider (75) near the first guide tube (76). An output tube is also provided on the side of the storage cavity (71) near the input tube. A one-way output valve is provided inside the output tube. One end of the output tube is connected to the storage cavity (71), and the other end of the output tube is connected to the inner wall of the flange tube (5).

2. The triple eccentric butterfly valve with compensated double sealing function according to claim 1, characterized in that: The valve core assembly (3) includes a butterfly plate (31), a valve seat (32), and a sealing ring (33). The butterfly plate (31) is fastened to the valve shaft (2), the valve seat (32) is fastened to the valve body (1), and the sealing ring (33) is fitted on the outer ring of the butterfly plate (31). The sealing ring (33) and the butterfly plate (31) are fastened to each other.

3. A triple eccentric butterfly valve with compensated double sealing function according to claim 2, characterized in that: The compensation component (4) includes a thrust plate (41), a pressure plate (42), a first compensation cavity (43), an annular pipe (44), and a compensation spring (45). The first compensation cavity (43) is located at the center inside the butterfly plate (31). The thrust plate (41) is fastened to the pressure plate (42) by a connecting rod. The thrust plate (41) is located outside the butterfly plate (31). The pressure plate (42) and the first compensation cavity (43) are slidably connected. One end of the compensation spring (45) is fastened to the pressure plate (42), and the other end of the compensation spring (45) is fastened to the first compensation cavity (43). The first compensation cavity (43) is filled with water. The first compensation cavity (43) is connected to the annular pipe (44) through a pipe. The annular pipe (44) is located inside the sealing ring (33).

4. A triple eccentric butterfly valve with compensated double sealing function according to claim 3, characterized in that: The compensation component (4) further includes a secondary sealing unit (46), which includes a side push plate (461), a second compensation cavity (462), a compensation block (463), and a filling gap (464). Multiple sets of the secondary sealing units (46) are provided, and the multiple sets of secondary sealing units (46) are evenly distributed around the center of the butterfly plate (31). The side push plate (461) and the outer surface of the butterfly plate (31) are slidably connected. The second compensation cavity (462) is embedded in the butterfly plate (31). The compensation block (463) and the second compensation cavity (462) are slidably connected. The compensation block (463) and the side push plate (461) are tightly connected. The filling gap (464) is provided in the sealing ring (33). The second compensation cavity (462) is connected to the filling gap (464) through a conduit. A one-way input valve is provided inside the conduit. The second compensation cavity (462) is filled with water.

5. A triple eccentric butterfly valve with compensated double sealing function according to claim 1, characterized in that: The flange pipe (5) is also provided with a movable cavity (78), which is connected to the sliding groove (72). The end of the input pipe connected to the inner slide plate (73) is located in the movable cavity (78).

6. A triple eccentric butterfly valve with compensated double sealing function according to claim 5, characterized in that: The control unit (6) includes a cover (61), a rotating wheel (62), a worm gear (63), a worm (64), a central rod (65), and a fixing component (66). The rotating wheel (62) and the worm (64) are fastened together, and the worm (64) and the cover (61) are rotatably connected. The central rod (65) and the worm gear (63) are fastened together, and the central rod (65) and the cover (61) are rotatably connected. The worm gear (63) and the worm (64) are meshed. One end of the fixing component (66) is connected to the central rod (65), and the other end of the fixing component (66) is connected to the worm (64). The cover (61) and the valve body (1) are fastened together.

7. A triple eccentric butterfly valve with compensated double sealing function according to claim 6, characterized in that: The fixing component (66) includes an inner shaft (661), an outer sleeve (662), an annular disc (663), a connecting strip (664), a retaining tooth (665), a fixing disc (666), an annular groove (667), and a retaining tooth ring (668). The inner shaft (661) and the outer sleeve (662) are slidably connected. A return spring is provided inside the outer sleeve (662). One end of the return spring is fastened to the outer sleeve (662), and the other end of the return spring is fastened to the inner shaft (661). The inner shaft (661) and the outer sleeve (662) separate the worm gear (64). The inner shaft (661) and the separated worm gear (64) 64) Fastening connection: the annular disc (663) is fitted on the outside of the outer sleeve (662), the annular disc (663) and the outer sleeve (662) are rotatably connected, the connecting strip (664) and the annular disc (663) are fastened together, the retaining tooth (665) and the end of the connecting strip (664) away from the annular disc (663) are fastened together, the fixed disc (666) and the center rod (65) are fastened together, the annular groove (667) is arranged around the center of the fixed disc (666), the retaining tooth ring (668) and the outer wall of the annular groove (667) are fastened together, and the retaining tooth (665) is provided with retaining edges on both sides.

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