Pneumatic ceramic rotary valve based on ceramic valve element and using method

Abstract

The invention belongs to the technical field of gate valves, particularly relates to a pneumatic ceramic rotary valve based on a ceramic valve element and a use method, and aims to solve the problems that an existing valve element is prone to being damaged under the water hammer effect, the water hammer effect impacts a valve body and a pipeline, and impurities in a gate valve cannot be removed. A liquid inlet pipe and a liquid outlet pipe are integrally formed on the two sides of the valve body respectively, a valve shaft is rotationally connected into the valve body, the outer wall of the valve shaft is fixedly sleeved with a first valve clack and a second valve clack, and the first valve clack and the second valve clack are used for controlling opening and closing of the liquid inlet pipe and the liquid outlet pipe respectively. The bottom of the liquid inlet pipe fixedly communicates with a cylinder, the cylinder and the first valve clack are each internally provided with a reduction structure used for reducing the water hammer effect, the ceramic valve element and the first piston plate extrude the first spring and the third spring correspondingly, the water hammer effect can be buffered, and the valve body and the first valve clack are prevented from being damaged.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, and in particular to a pneumatic ceramic rotary valve based on a ceramic valve core and a use method thereof. Background Art

[0002] The rotary valve is a high-performance fluid control device, widely used in chemical, electric power, petroleum, metallurgy and other fields, especially in the treatment of corrosive, abrasive or high-temperature media. The valve core made of high-performance ceramic material has excellent corrosion resistance, wear resistance and high temperature resistance, ensuring the long-term stable operation of the valve under harsh working conditions.

[0003] In the prior art, the rotary valve still has the following deficiencies during use: 1. When the rotary valve rotates to close the valve core, the water flow in the pipe is blocked by the valve core, which produces a water hammer effect. This water hammer effect has a strong impact on the valve core. Therefore, the valve core is gradually damaged over a long period of time, affecting the sealing effect of the valve core; 2. The water hammer effect also causes impact on the valve body and pipeline, affecting the service life of the valve body and pipeline. In addition, the medium in the valve body carries impurities during the flow, and when the valve core is closed, these impurities remain in the valve body and affect the use of the gate valve.

[0004] In view of the above problems, the present invention document proposes a pneumatic ceramic rotary valve based on a ceramic valve core and a method of use. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the existing valve core that is easily damaged under the water hammer effect, the water hammer effect causes impact on the valve body and pipeline, and the impurities inside the gate valve cannot be removed, and to propose a pneumatic ceramic rotary valve based on a ceramic valve core and a method of use.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A pneumatic ceramic rotary valve based on a ceramic valve core comprises a valve body, a liquid inlet pipe and a liquid outlet pipe are integrally formed on both sides of the valve body, a valve shaft is rotatably connected in the valve body, a first valve flap and a second valve flap are fixedly sleeved on the outer wall of the valve shaft, and the first valve flap and the second valve flap are respectively used to control the opening and closing of the liquid inlet pipe and the liquid outlet pipe; The bottom of the liquid inlet pipe is fixedly connected with a cylinder, and the cylinder and the first valve disc are both provided with a reduction structure for reducing the water hammer effect, and the reduction structure includes a first piston plate and a ceramic valve core arranged in the cylinder and the first valve disc respectively; An annular groove is provided in the first valve flap, and a rubber sealing ring is slidably connected in the annular groove, which is used to increase the sealing performance of the first valve flap to the liquid inlet pipe when the liquid inlet pipe is closed. A sealing structure is provided in the first valve flap, which is used to squeeze the rubber sealing ring toward the liquid inlet pipe, and the reduction structure can drive the sealing structure when it is running, and the sealing structure includes a frustum arranged in the first valve flap; Two scrapers are slidably connected to the inner wall of the bottom of the valve body, and a collecting cylinder is fixedly penetrated through the bottom of the valve body. A scraping structure for driving the two scrapers to move toward each other is provided between the valve body and the collecting cylinder, so that the two scrapers scrape the precipitated impurities into the collecting cylinder, and the scraping structure can be driven when the reduction structure is in operation.

[0007] In a possible design, the reduction structure also includes a circular groove arranged on the side of the first valve disc close to the liquid inlet pipe, the ceramic valve core is slidably arranged in the circular groove, the ceramic valve core cooperates with one end of the liquid inlet pipe to close the liquid inlet pipe, a circular cavity is provided in the first valve disc, a sliding rod is fixed on the side of the ceramic valve core away from the liquid inlet pipe, one end of the sliding rod seals and slides and extends into the circular cavity, the outer wall of the sliding rod is fixedly sleeved with a sliding ring sliding in the circular cavity, a first spring is fixed on the side of the sliding ring away from the ceramic valve core, and one end of the first spring is fixedly connected to the inner wall of one side of the circular cavity, the first spring is sleeved on the outer wall of the sliding rod, and the cooperation between the ceramic valve core and the first spring is used to convert the impact force of the water flow into the potential energy of compression of the first spring; a second fixed rod is fixed to the bottom of the cylinder, and the first piston plate seals and slides in the cylinder. The first piston plate sealing sliding sleeve is arranged on the outer wall of the second fixed rod, and a third spring is fixed between the bottom of the first piston plate and the bottom inner wall of the cylinder, and the third spring is sleeved on the outer wall of the second fixed rod. The cooperation between the first piston plate and the third spring is used to convert the impact force of the water flow into the potential energy of the compression of the third spring; when the first valve disc closes the liquid inlet pipe, the water flow in the pipeline connected to the liquid inlet pipe impacts in the direction of the first valve disc under the water hammer effect, and at this time the water flow impacts the ceramic valve core, and the ceramic valve core drives the sliding rod and the sliding ring to move under the impact of the water flow, and the first spring is compressed and stored, and then the impact force of the water flow can be converted into the potential energy of the first spring, which plays a buffering role; under the action of the water hammer, the water flow in the liquid inlet pipe enters the cylinder and pushes the first piston plate to squeeze the third spring, converting the impact force of the water flow into the potential energy of the compression of the third spring, and further buffering the water flow.

[0008] In a possible design, the closing structure also includes an annular groove arranged on the side of the first valve disc close to the liquid inlet pipe, a circular ring is slidably connected in the annular groove, and the side of the annular groove close to the liquid inlet pipe is fixedly connected to the rubber closing ring, the circular cone is fixed to the outer wall of the sliding rod and is located in the circular cavity, a plurality of clearance grooves are arranged in the circular ring, a plurality of the clearance grooves are each provided with a trapezoidal plate, the ends of the plurality of trapezoidal plates close to each other are sealed and slidably extended into the circular cavity, and the trapezoidal plate is located between the sliding ring and the circular cone, the inclined surface of the circular cone cooperates with the inclined surface of the trapezoidal plate, the inner walls on both sides of the plurality of clearance grooves away from each other are each provided with an inclined groove, and the plurality of A pin is fixedly passed through the trapezoidal plate, and both ends of the pin extend into corresponding inclined grooves respectively. The trapezoidal plate is used to control the movement of the circular ring through the cooperation of the inclined groove and the pin. A plurality of second springs are fixed on the side of the circular ring away from the rubber sealing ring, and one end of each of the plurality of second springs is fixedly connected to an inner wall of one side of the annular groove. When the ceramic valve core drives the sliding rod to squeeze the first spring under the impact of water flow, the frustum moves synchronously, and the inclined surface on one side cooperates with the inclined surface of the trapezoidal plate to squeeze the trapezoidal plate outward. The trapezoidal plate drives the circular ring and the rubber sealing ring to move toward the direction of the liquid inlet pipe under the cooperation of the pin and the inclined groove, thereby increasing the sealing between the first valve flap and the liquid inlet pipe.

[0009] In a possible design, the scraping structure includes a rotating shaft rotating in the collecting cylinder, and the top of the rotating shaft extends into the valve body, the outer wall of the rotating shaft is fixedly sleeved with a second gear located in the valve body, a second rack is fixed on the side where the two scrapers are close to each other, and the sides where the two second racks are close to each other are meshed with the second gear, and the rotating shaft drives the two scrapers to move toward each other through the cooperation of the second gear and the second rack, a transmission box is fixed at the bottom of the collecting cylinder, the bottom end of the rotating shaft is sealed and rotated through the bottom of the collecting cylinder and extends into the transmission box, a third gear is fixed at the bottom end of the rotating shaft, a second piston plate is sealingly and slidably connected in the transmission box, a third rack is fixed on the side of the second piston plate away from the liquid inlet pipe, the third rack is meshed with the third gear, the bottom end of the cylinder is fixedly connected to a connecting pipe, one side of the connecting pipe The first end is connected with the transmission box, which is used to inject the air in the cylinder into the transmission box and drive the second piston plate to move in the direction of the third gear. Two limit blocks are fixed to the inner wall at the bottom of the second gear, which are used to limit the movement of the second piston plate. When the first piston plate moves downward, the air is squeezed into the transmission box through the connecting pipe, and the air entering the transmission box pushes the second piston plate and the third rack to move. The cooperation of the third rack and the third gear drives the rotating shaft to rotate. The two scrapers move toward each other under the cooperation of the second rack and the second gear. When the liquid inlet pipe is closed, impurities in the water flow in the valve body are deposited at the bottom of the valve body under the action of gravity. At this time, the two scrapers move toward each other to scrape the deposited impurities into the collecting cylinder. Thereafter, the first sealing plug is loosened to discharge the impurities inside. When the water hammer effect disappears, the third spring pushes the first piston plate to move up and reset, and the two scrapers are reset synchronously at this time.

[0010] In a possible design, a box body is fixed to the top inner wall of the valve body, one end of the valve shaft seals and rotates through the box body, a lifting plate is slidably connected in the box body, a first rack is fixed to the bottom of the lifting plate, an outer wall fixed sleeve of the valve shaft is provided with a first gear located in the box body, and the first gear is meshed with the first rack, a connecting frame is fixed to the top of the valve body, a cylinder is fixed to the top of the connecting frame, a valve stem is fixed to the output shaft of the cylinder, and the bottom end of the valve stem seals and slides and extends into the valve body and is fixedly connected to the top of the lifting plate, which is used to drive the first rack to rise and fall; the valve stem is driven to rise and fall by the cylinder, and the valve stem drives the first rack to rise and fall through the lifting plate, and the cooperation of the first rack and the first gear drives the first valve flap and the second valve flap to rotate, thereby controlling the closing and opening of the liquid inlet pipe and the liquid outlet pipe.

[0011] In a possible design, a first fixing rod is fixed to the bottom of the box body, and a support plate is fixed to the bottom end of the first fixing rod. The two ends of the support plate respectively contact the sides of the first valve flap and the second valve flap that are close to each other, so as to support the first valve flap when the water flow hits the first valve flap. The tops of the two scrapers and the second rack are slidably connected to the bottom of the support plate, so as to increase the stability of the movement of the scrapers and the second rack.

[0012] In a possible design, one side of the collecting tube is threadedly connected with a first sealing plugging wire for discharging impurities.

[0013] In a possible design, an oil storage box located below the lifting plate is fixed in the box body for storing lubricating oil. The top of the oil storage box is fixedly connected to an oil filling pipe, and the top of the oil filling pipe is fixedly passed through the valve body. A plurality of oil leakage holes are provided at the bottom of the oil storage box for dripping the lubricating oil in the oil storage box onto the valve shaft and the first gear through the oil leakage holes. A closing plate for closing the oil leakage holes is sealingly and slidably connected in the oil storage box. A plurality of U-shaped rods are slidably passed through the top of the oil storage box, and one end of each of the plurality of U-shaped rods is fixedly connected to the top of the closing plate. The top of the rotating shaft rotates through the valve shaft in turn. The U-shaped rod is fixed with a triangular bar on the top of the rotating shaft, and the other bottom end of the U-shaped rod is in an arc shape. The triangular bar cooperates with the bottom end of the U-shaped rod in an arc shape to drive the U-shaped rod to move up and release the blockage of the oil leakage hole; the rotating shaft synchronously drives the triangular bar to rotate, and the inclined surface of the triangular bar cooperates with the arc surface at the bottom of the U-shaped rod to drive the U-shaped rod and the closing plate to move up, and the closing plate releases the blockage of the oil leakage hole, and the lubricating oil stored in the oil storage box drips onto the valve shaft and the first gear through the oil leakage hole to complete the lubrication operation, so that the first valve flap and the second valve flap can be opened and closed more smoothly.

[0014] In a possible design, a plurality of load-bearing blocks are fixed on the top of the closing plate, and the plurality of load-bearing blocks are respectively fixedly sleeved on the outer wall of the U-shaped rod, so that the closing plate can re-seal the oil leakage hole under the action of the gravity of the U-shaped rod and the load-bearing blocks.

[0015] In the present application, a method for using a pneumatic ceramic rotary valve based on a ceramic valve core comprises the following steps: S1. When it is necessary to control the closing and opening of the liquid inlet pipe and the liquid outlet pipe, the valve stem is driven to rise and fall by the cylinder, and the valve stem drives the first rack to rise and fall through the lifting plate. The cooperation of the first rack and the first gear drives the first valve flap and the second valve flap to rotate, thereby controlling the closing and opening of the liquid inlet pipe and the liquid outlet pipe. When the liquid inlet pipe and the liquid outlet pipe are closed, the two ends of the support plate touch the side where the first valve flap and the second valve flap are close to each other, respectively, to support the first valve flap and the second valve flap, and prevent the first valve flap from being deformed under the action of water hammer; S2. When the first valve disc closes the liquid inlet pipe, the water flow in the pipeline connected to the liquid inlet pipe impacts the direction of the first valve disc under the water hammer effect. At this time, the water flow impacts the ceramic valve core, and the ceramic valve core drives the sliding rod, the sliding ring and the frustum to move under the impact of the water flow. The first spring is compressed and stored, and the impact force of the water flow can be converted into the potential energy of the first spring, which plays a buffering role. When the frustum moves, the inclined surface on one side cooperates with the inclined surface of the trapezoidal plate to squeeze the trapezoidal plate outward. The trapezoidal plate drives the circular ring and the rubber sealing ring to move in the direction of the liquid inlet pipe under the cooperation of the pin rod and the inclined groove, thereby increasing the sealing between the first valve disc and the liquid inlet pipe. S3. In addition, when the first valve disc closes the liquid inlet pipe, water flows into the liquid inlet pipe under the action of water hammer, gathers and impacts the first valve disc. Since the first valve disc is closed, the water flow in the liquid inlet pipe enters the cylinder and pushes the first piston plate to squeeze the third spring, converting the impact force of the water flow into the potential energy of the compression of the third spring, further buffering the water flow. When the first piston plate moves downward, it squeezes the air into the transmission box through the connecting pipe, and the air entering the transmission box pushes the second piston plate and the third rack to move. The cooperation of the third rack and the third gear drives the rotating shaft to rotate. The two scrapers move toward each other under the cooperation of the second rack and the second gear to scrape the precipitated impurities into the collecting barrel. Thereafter, the first sealing plugging wire is loosened to discharge the impurities inside. When the water hammer effect disappears, the third spring pushes the first piston plate to move up and reset, and the two scrapers are reset synchronously at this time. S4. In addition, when the rotating shaft rotates and scrapes off impurities, the rotating shaft synchronously drives the triangular bar to rotate. The inclined surface of the triangular bar cooperates with the arc surface at the bottom of the U-shaped rod to drive the U-shaped rod and the closing plate to move up. The closing plate releases the seal on the oil leakage hole. The lubricating oil stored in the oil storage box drips onto the valve shaft and the first gear through the oil leakage hole to complete the lubrication operation, making the opening and closing of the first valve flap and the second valve flap smoother. Later, after the rotating shaft and the triangular bar rotate in the opposite direction and reset, the closing plate re-seals the oil leakage hole under the gravity of the load-bearing block and the U-shaped rod.

[0016] Beneficial effects: In the present invention, a ceramic valve core is slidably mounted on one side of the first valve flap through a circular groove, a sliding rod extending into the circular cavity is fixed on one side of the ceramic valve core, and a first spring is fixed to the outer wall of the sliding rod through a sliding ring; a first piston plate is sealingly and slidably connected in the cylinder, and a third spring is fixed between the bottom of the first piston plate and the bottom inner wall of the cylinder; when the liquid inlet pipe is closed, the water flow impacts the ceramic valve core and squeezes the first spring, and at the same time, the water flow enters the cylinder and squeezes the third spring through the first piston plate, thereby converting the impact force of the water flow into the potential energy of compression of the first and third springs, which plays a buffering role, thereby avoiding damage to the valve body and the first valve flap caused by the water hammer effect; In the present invention, a circular rubber sealing ring is slidably connected in the annular groove and fixed on one side of the circular ring. One end of the plurality of trapezoidal plates close to each other is sealed and slidably extended into the circular cavity. A pin rod is fixedly passed through the plurality of trapezoidal plates, and both ends of the pin rod extend into the corresponding inclined grooves respectively. When the ceramic valve core drives the sliding rod to squeeze the first spring under the impact of the water flow, the frustum moves synchronously, and the inclined surface on one side cooperates with the inclined surface of the trapezoidal plate to squeeze the trapezoidal plate outward. The trapezoidal plate drives the circular ring and the rubber sealing ring to move in the direction of the liquid inlet pipe under the cooperation of the pin rod and the inclined groove, thereby increasing the sealing between the first valve flap and the liquid inlet pipe. In the present invention, a second gear is fixedly sleeved on the outer wall of the rotating shaft, a second rack is fixed on the side where the two scrapers are close to each other, the bottom end of the rotating shaft extends into the transmission box and is fixed with a third gear, a second piston plate is sealingly and slidably connected in the transmission box, a third rack is fixed on the side of the second piston plate away from the liquid inlet pipe, and the bottom end of the cylinder is connected to the transmission box through the second piston plate; when the first piston plate moves downward, air is squeezed into the transmission box, and the second piston plate and the third rack are pushed to move, and the cooperation of the third rack, the third gear and the second rack, the second gear drives the two scrapers to move toward each other, and the precipitated impurities are scraped into the collecting cylinder, which is convenient for the later discharge of impurities.

[0017] In the present invention, the ceramic valve core and the first piston plate squeeze the first spring and the third spring respectively, which can buffer the water hammer effect and avoid damage to the valve body and the first valve disc. When the first spring and the third spring convert the impact force of the water flow into compression potential energy, they can simultaneously drive the rubber sealing ring to move to increase the sealing performance of the first valve disc to the liquid inlet pipe and drive the two scrapers to move to scrape away impurities deposited on the bottom of the valve body. The function is comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Figure 2 A schematic diagram of a three-dimensional exploded structure of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Figure 3 A schematic diagram of a three-dimensional cross-sectional structure of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Figure 4 A schematic diagram of a three-dimensional exploded cross-sectional structure of a box body, a first valve flap, and a second valve flap of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Figure 5 A schematic diagram of a three-dimensional cross-sectional structure of a first valve disc of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Figure 6 A schematic diagram of a three-dimensional exploded cross-sectional structure of a first valve flap, a ceramic valve core and a circular ring of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Figure 7 for Figure 6 The enlarged structural diagram at A in the middle; Figure 8 A schematic diagram of a three-dimensional exploded cross-sectional structure of a cylinder, a collecting cylinder and a supporting plate of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Fig. 9 A schematic diagram of a three-dimensional exploded structure of a second piston plate, a triangular bar and a transmission box of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 1 of the present invention; Fig.10 A schematic diagram of a three-dimensional cross-sectional structure of a lifting plate of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 2 of the present invention; Fig.11 A three-dimensional cross-sectional structural schematic diagram of an oil storage box and a closing plate of a pneumatic ceramic rotary valve based on a ceramic valve core provided in Example 2 of the present invention.

[0019] In the figure: 1, valve body; 2, liquid inlet pipe; 3, liquid outlet pipe; 4, connecting frame; 5, cylinder; 6, box body; 7, lifting plate; 8, valve stem; 9, first rack; 10, valve shaft; 11, first gear; 12, first valve flap; 13, second valve flap; 14, circular groove; 15, ceramic valve core; 16, sliding rod; 17, circular cavity; 18, sliding ring; 19, first spring; 20, annular groove; 21, circular ring; 22, rubber sealing ring; 23, trapezoidal plate; 24, frustum; 25, give way groove; 26, inclined groove; 27, pin rod; 28, second spring ; 29. ​​First fixed rod; 30. Support plate; 31. Scraper; 32. Collecting cylinder; 33. Rotating shaft; 34. Second gear; 35. Second rack; 36. First sealing plug; 37. Transmission box; 38. Cylinder; 39. Second fixed rod; 40. First piston plate; 41. Third spring; 42. Connecting pipe; 43. Second piston plate; 44. Third rack; 45. Third gear; 46. Limit block; 47. Triangle bar; 48. Oil leakage hole; 49. Oil storage box; 50. Oil filling pipe; 51. U-shaped rod; 52. Closing plate; 53. Load-bearing block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1: Reference Figure 1-Figure 3The invention relates to the technical field of gate valves. The pneumatic ceramic rotary valve mainly comprises a valve body 1. A liquid inlet pipe 2 and a liquid outlet pipe 3 are formed integrally on both sides of the valve body 1 for inputting and outputting liquids. A valve shaft 10 is rotatably connected in the valve body 1. A first valve flap 12 and a second valve flap 13 are fixedly sleeved on the outer wall of the valve shaft 10. The first valve flap 12 is used to control the opening and closing of the liquid inlet pipe 2, and the second valve flap 13 is used to control the opening and closing of the liquid outlet pipe 3.

[0022] Reference Figure 1-Figure 4 , a box body 6 is fixed to the top inner wall of the valve body 1, and one end of the valve shaft 10 is sealed and rotated to penetrate the box body 6 and extend to the inside thereof. In the box body 6, a lifting plate 7 is slidably connected, and a first rack 9 is fixed to the bottom of the lifting plate 7. At the same time, the outer wall of the valve shaft 10 is fixedly sleeved with a first gear 11 located in the box body 6, and the first gear 11 is meshed with the first rack 9. In this way, when the first rack 9 is raised or lowered, the first gear 11 will be driven to rotate, thereby driving the valve shaft 10 and the valve flap to rotate. In order to drive the lifting plate 7 to rise and fall, a connecting frame 4 is fixed to the top of the valve body 1, and a cylinder 5 is fixed to the top of the connecting frame 4. The output shaft of the cylinder 5 is fixed with a valve stem 8, and the bottom end of the valve stem 8 is sealed and slidably extended into the valve body 1 and is fixedly connected to the top of the lifting plate 7. When the cylinder 5 is working, it will drive the valve stem 8 to rise and fall, thereby driving the first rack 9 to rise and fall through the lifting plate 7, thereby realizing the rotation control of the valve flap.

[0023] Reference Figure 1 , Figure 5 , Figure 6 and Figure 8, a cylinder 38 is fixedly connected to the bottom of the liquid inlet pipe 2, and a reduction structure for reducing the water hammer effect is provided in the cylinder 38 and the first valve disc 12. The reduction structure specifically includes a first piston plate 40 arranged in the cylinder 38 and a ceramic valve core 15 arranged in the first valve disc 12. A circular groove 14 is provided in the first valve disc 12, and the ceramic valve core 15 is slidably arranged in the circular groove 14 and cooperates with one end of the liquid inlet pipe 2 to close the liquid inlet pipe 2. A circular cavity 17 is also provided in the first valve disc 12, and a sliding rod 16 is fixed on the side of the ceramic valve core 15 away from the liquid inlet pipe 2, and one end of the sliding rod 16 extends into the circular cavity 17 in a sealed sliding manner. A sliding ring 18 sliding in the circular cavity 17 is fixedly sleeved on the outer wall of the sliding rod 16, and a first spring 19 is fixed on the side of the sliding ring 18 away from the ceramic valve core 15, and one end of the first spring 19 is fixedly connected to the inner wall of one side of the circular cavity 17, and the first spring 19 is sleeved on the outer wall of the sliding rod 16. The ceramic valve core 15 cooperates with the first spring 19 to convert the impact force of the water flow into the potential energy of the compression of the first spring 19. A second fixing rod 39 is fixed to the bottom of the cylinder 38, and the first piston plate 40 is sealed and slidable in the cylinder 38, and is sealed and slidably sleeved on the outer wall of the second fixing rod 39. A third spring 41 is fixed between the bottom of the first piston plate 40 and the inner wall of the bottom of the cylinder 38, and the third spring 41 is sleeved on the outer wall of the second fixing rod 39. The first piston plate 40 and the third spring 41 cooperate to convert the impact force of the water flow into the potential energy of the compression of the third spring 41.

[0024] Specifically, when the first valve flap 12 closes the liquid inlet pipe 2, if the water flow in the pipe connected to the liquid inlet pipe 2 impacts the first valve flap 12 under the water hammer effect, the water flow will impact the ceramic valve core 15. Under the impact of the water flow, the ceramic valve core 15 drives the sliding rod 16 and the sliding ring 18 to move, so that the first spring 19 is compressed and stored, and then the impact force of the water flow can be converted into the potential energy of the first spring 19, which plays a buffering role. At the same time, under the action of water hammer, the water flow in the liquid inlet pipe 2 will enter the cylinder 38 and push the first piston plate 40 to squeeze the third spring 41, converting the impact force of the water flow into the potential energy of the compression of the third spring 41, further buffering the water flow.

[0025] Reference Figure 1 , Figure 5 , Figure 6 and Figure 7, an annular groove 20 is also provided in the first valve flap 12, and a rubber sealing ring 22 is slidably connected in the annular groove 20, which is used to increase the sealing performance of the first valve flap 12 to the liquid inlet pipe 2 when the liquid inlet pipe 2 is closed. A closing structure is also provided in the first valve flap 12, which is used to squeeze the rubber sealing ring 22 in the direction of the liquid inlet pipe 2, and the reduction structure can drive the closing structure when it is in operation. The closing structure specifically includes a circular ring 21 slidably arranged in the annular groove 20, and the side of the annular groove 20 close to the liquid inlet pipe 2 is fixedly connected to the rubber sealing ring 22. The frustum 24 is fixed to the outer wall of the sliding rod 16 and is located in the circular cavity 17. A plurality of clearance grooves 25 are provided in the circular ring 21, and a trapezoidal plate 23 is provided in each of the plurality of clearance grooves 25. The ends of the plurality of trapezoidal plates 23 close to each other are all sealed and slidably extended into the circular cavity 17, and the trapezoidal plate 23 is located between the sliding ring 18 and the frustum 24. The inclined surface of the truncated cone 24 matches the inclined surface of the trapezoidal plate 23. The inner walls of the two sides of the multiple paving grooves 25 away from each other are provided with inclined grooves 26. The multiple trapezoidal plates 23 are fixed with pins 27, and the two ends of the pins 27 extend into the corresponding inclined grooves 26. The trapezoidal plates 23 are used to control the movement of the ring 21 through the cooperation of the inclined grooves 26 and the pins 27. Multiple second springs 28 are fixed on the side of the ring 21 away from the rubber sealing ring 22, and one end of the multiple second springs 28 is fixedly connected to the inner wall of one side of the annular groove 20.

[0026] Specifically, when the ceramic valve core 15 drives the sliding rod 16 to squeeze the first spring 19 under the impact of water flow, the truncated cone 24 moves synchronously. The inclined surface on one side of the truncated cone 24 cooperates with the inclined surface of the trapezoidal plate 23 to squeeze the trapezoidal plate 23 outward. Under the cooperation of the pin 27 and the inclined groove 26, the trapezoidal plate 23 drives the ring 21 and the rubber sealing ring 22 to move toward the direction of the liquid inlet pipe 2, thereby increasing the sealing between the first valve flap 12 and the liquid inlet pipe 2.

[0027] Reference Figure 3 , Figure 4 , Figure 7 and Fig. 9In addition, two scrapers 31 are slidably connected to the inner wall of the bottom of the valve body 1, and a collecting barrel 32 is fixedly passed through the bottom of the valve body 1. A scraping structure for driving the two scrapers 31 to move toward each other is provided between the valve body 1 and the collecting barrel 32, so that the two scrapers 31 can scrape the precipitated impurities into the collecting barrel 32, and the scraping structure can be driven when the reduction structure is in operation. The scraping structure includes a rotating shaft 33 rotating in the collecting barrel 32, and the top of the rotating shaft 33 extends into the valve body 1. The outer wall of the rotating shaft 33 is fixedly sleeved with a second gear 34 located in the valve body 1, and the sides of the two scrapers 31 close to each other are fixed with a second rack 35, and the sides of the two second racks 35 close to each other are meshed with the second gear 34. In this way, when the rotating shaft 33 rotates, the two scrapers 31 will be driven to move toward each other through the cooperation of the second gear 34 and the second rack 35. In order to realize the rotation control of the rotating shaft 33, a transmission box 37 is fixed at the bottom of the collecting barrel 32. The bottom end of the rotating shaft 33 is sealed and rotated to penetrate the bottom of the collecting barrel 32 and extend into the transmission box 37. A third gear 45 is fixed at the bottom end of the rotating shaft 33. A second piston plate 43 is sealed and slidably connected in the transmission box 37. A third rack 44 is fixed on the side of the second piston plate 43 away from the liquid inlet pipe 2. The third rack 44 is meshed with the third gear 45. A connecting pipe 42 is fixedly connected to the bottom end of the cylinder 38. One end of the connecting pipe 42 is connected to the transmission box 37. In this way, when the air in the cylinder 38 is squeezed, it will be injected into the transmission box 37 through the connecting pipe 42, and drive the second piston plate 43 to move in the direction of the third gear 45. At the same time, two limit blocks 46 are fixed to the inner wall of the bottom of the second gear 34 to limit the movement of the second piston plate 43.

[0028] Specifically, when the rotary valve encounters a water hammer effect during use, the first piston plate 40 will move downward, squeezing the air into the transmission box 37 through the connecting pipe 42. The air entering the transmission box 37 will push the second piston plate 43 and the third rack 44 to move, and the cooperation between the third rack 44 and the third gear 45 will drive the rotating shaft 33 to rotate. Then, the two scrapers 31 move toward each other in cooperation with the second rack 35 and the second gear 34. The two scrapers 31 move toward each other to scrape the precipitated impurities into the collecting barrel 32. Thereafter, the impurities inside the first sealing plug 36 can be discharged by loosening the first sealing plug 36. When the water hammer effect disappears, the third spring 41 will push the first piston plate 40 to move upward and reset. At this time, the two scrapers 31 will also be reset synchronously in cooperation with the second rack 35 and the second gear 34.

[0029] Reference Figure 4 and Figure 8In addition, in order to improve the stability of the movement of the scraper 31 and the second rack 35, a first fixing rod 29 is fixed to the bottom of the box body 6, and a support plate 30 is fixed to the bottom end of the first fixing rod 29. The two ends of the support plate 30 are respectively in contact with the side of the first valve flap 12 and the second valve flap 13 that are close to each other, and are used to support the first valve flap 12 when the water flow impacts the first valve flap 12. At the same time, the tops of the two scrapers 31 and the second rack 35 are slidably connected to the bottom of the support plate 30.

[0030] Reference Figure 8 A first sealing plug 36 is threadedly connected to one side of the collecting tube 32. The main purpose of this design is to facilitate the discharge of impurities generated in the valve and ensure the smooth operation of the valve. In actual operation, when impurities accumulate to a certain extent, the first sealing plug 36 can be unscrewed to clean it, and then re-tightened to restore the seal.

[0031] In summary, the pneumatic ceramic rotary valve can not only effectively reduce the water hammer effect and improve the sealing of the valve through the cooperation of the reduction structure, the closing structure and the scraping structure, but also can timely remove the precipitated impurities in the valve body to ensure the normal operation of the valve.

[0032] Example 2: Reference Fig.10 and Fig.11 , improved on the basis of Example 1: an oil storage box 49 located below the lifting plate 7 is fixed in the box body 6. The main function of this oil storage box 49 is to store lubricating oil. The top of the oil storage box 49 is connected to an oil filling pipe 50 by a fixed connection, and the top of the oil filling pipe 50 is fixedly passed through the valve body 1 to facilitate the addition of lubricating oil into the oil storage box 49. A plurality of oil leakage holes 48 are provided at the bottom of the oil storage box 49. The design of these oil leakage holes 48 allows the lubricating oil in the oil storage box 49 to drip onto the valve shaft 10 and the first gear 11, thereby completing the lubrication operation. In order to ensure the controllability of the lubrication process, a sealing plate 52 is connected in a sealing and sliding manner in the oil storage box 49, and the sealing plate 52 is used to close the oil leakage hole 48. When lubrication is required, the sealing plate 52 will open the oil leakage hole 48; and when the lubrication is completed, the sealing plate 52 will re-close the oil leakage hole 48. In order to realize the up and down movement of the sealing plate 52, a plurality of U-shaped rods 51 are slidably passed through the top of the oil storage box 49. One end of the U-shaped rods 51 is fixedly connected to the top of the closing plate 52, and the other end is designed in an arc shape. In addition, the top end of the rotating shaft 33 rotates through the supporting plate 30 and the first fixed rod 29 in sequence, and extends into the box body 6. A triangular bar 47 is fixed to the top end of the rotating shaft 33, and the triangular bar 47 matches the bottom end of the U-shaped rod 51 in an arc shape.

[0033] Specifically, in actual operation, when the rotating shaft 33 rotates, it will synchronously drive the triangular bar 47 to rotate. The inclined surface of the triangular bar 47 cooperates with the arc surface at the bottom of the U-shaped rod 51, thereby driving the U-shaped rod 51 to move upward and release the seal of the oil leakage hole 48. At this time, the lubricating oil in the oil storage box 49 will drip onto the valve shaft 10 and the first gear 11 through the oil leakage hole 48, completing the lubrication operation. This design makes the opening and closing of the first valve flap 12 and the second valve flap 13 smoother.

[0034] Reference Fig.11 A plurality of bearing blocks 53 are also fixed on the top of the closing plate 52, and these bearing blocks 53 are respectively fixedly sleeved on the outer wall of the U-shaped rod 51. The main purpose of this design is to enable the closing plate 52 to re-close the oil leakage hole 48 under the gravity of the U-shaped rod 51 and the bearing blocks 53.

[0035] Specifically, when the lubrication operation is completed, the triangular bar 47 no longer applies pressure to the U-shaped rod 51. At this time, the gravity of the U-shaped rod 51 and the load-bearing block 53 will cause the closing plate 52 to move down and re-close the oil leakage hole 48, thereby ensuring that the storage and use of the lubricating oil is more stable and safe.

[0036] A method for using a pneumatic ceramic rotary valve based on a ceramic valve core comprises the following steps: S1. When it is necessary to control the closing and opening of the liquid inlet pipe 2 and the liquid outlet pipe 3, the valve stem 8 is driven to rise and fall by the cylinder 5, and the valve stem 8 drives the first rack 9 to rise and fall through the lifting plate 7. The cooperation of the first rack 9 and the first gear 11 drives the first valve flap 12 and the second valve flap 13 to rotate, thereby controlling the closing and opening of the liquid inlet pipe 2 and the liquid outlet pipe 3. When the liquid inlet pipe 2 and the liquid outlet pipe 3 are closed, the two ends of the support plate 30 touch the side where the first valve flap 12 and the second valve flap 13 are close to each other, so as to support the first valve flap 12 and the second valve flap 13 to prevent the first valve flap 12 from being deformed under the action of water hammer; S2. When the first valve flap 12 closes the liquid inlet pipe 2, the water flow in the pipe connected to the liquid inlet pipe 2 impacts the direction of the first valve flap 12 under the water hammer effect. At this time, the water flow impacts the ceramic valve core 15, and the ceramic valve core 15 drives the sliding rod 16, the sliding ring 18 and the frustum 24 to move under the impact of the water flow. The first spring 19 is compressed and stored, and the impact force of the water flow can be converted into the potential energy of the first spring 19, which plays a buffering role; when the frustum 24 moves, the inclined surface on one side thereof cooperates with the inclined surface of the trapezoidal plate 23 to squeeze the trapezoidal plate 23 outward, and the trapezoidal plate 23 drives the ring 21 and the rubber sealing ring 22 to move in the direction of the liquid inlet pipe 2 under the cooperation of the pin rod 27 and the inclined groove 26, thereby increasing the sealing between the first valve flap 12 and the liquid inlet pipe 2; S3. In addition, when the first valve flap 12 closes the liquid inlet pipe 2, water flows into the liquid inlet pipe 2 under the action of water hammer, gathers and impacts the first valve flap 12. Since the first valve flap 12 is closed, the water flow in the liquid inlet pipe 2 enters the cylinder 38 and pushes the first piston plate 40 to squeeze the third spring 41, converting the impact force of the water flow into the potential energy of the compression of the third spring 41, further buffering the water flow. When the first piston plate 40 moves downward, it squeezes the air into the transmission box 37 through the connecting pipe 42, and the air entering the transmission box 37 pushes the second piston plate 43 and the third rack 44 to move. The cooperation of the third rack 44 and the third gear 45 drives the rotating shaft 33 to rotate. The two scrapers 31 move toward each other under the cooperation of the second rack 35 and the second gear 34, so as to scrape the precipitated impurities into the collecting tube 32. Thereafter, the first sealing plug 36 is loosened to discharge the impurities inside. When the water hammer effect disappears, the third spring 41 pushes the first piston plate 40 to move upward and reset, and the two scrapers 31 are reset synchronously at this time. S4. In addition, when the rotating shaft 33 rotates and scrapes off impurities, the rotating shaft 33 synchronously drives the triangular bar 47 to rotate. The inclined surface of the triangular bar 47 cooperates with the arc surface at the bottom of the U-shaped rod 51 to drive the U-shaped rod 51 and the closing plate 52 to move upward, and the closing plate 52 releases the seal on the oil leakage hole 48. The lubricating oil stored in the oil storage box 49 drips onto the valve shaft 10 and the first gear 11 through the oil leakage hole 48 to complete the lubrication operation, so that the first valve flap 12 and the second valve flap 13 can open and close more smoothly. Later, after the rotating shaft 33 and the triangular bar 47 rotate in the opposite direction to reset, the closing plate 52 re-seals the oil leakage hole 48 under the action of the gravity of the load-bearing block 53 and the U-shaped rod 51.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pneumatic ceramic rotary valve based on a ceramic valve core, characterized in that: It comprises a valve body (1), wherein a liquid inlet pipe (2) and a liquid outlet pipe (3) are integrally formed on both sides of the valve body (1), a valve shaft (10) is rotatably connected inside the valve body (1), and a first valve flap (12) and a second valve flap (13) are fixedly sleeved on the outer wall of the valve shaft (10); The bottom of the liquid inlet pipe (2) is fixedly connected to a cylinder (38), and a mitigation structure for mitigating the water hammer effect is provided in the cylinder (38) and the first valve flap (12), and the mitigation structure comprises a first piston plate (40) and a ceramic valve core (15) respectively arranged in the cylinder (38) and the first valve flap (12); An annular groove (20) is provided in the first valve flap (12), a rubber sealing ring (22) is slidably connected in the annular groove (20), a sealing structure is provided in the first valve flap (12) for squeezing the rubber sealing ring (22) in the direction of the liquid inlet pipe (2), and the reduction structure can drive the sealing structure when it is in operation, the sealing structure comprising a truncated cone (24) provided in the first valve flap (12); Two scrapers (31) are slidably connected to the inner wall of the bottom of the valve body (1), a collecting barrel (32) is fixedly passed through the bottom of the valve body (1), and a scraping structure for driving the two scrapers (31) to move towards each other is provided between the valve body (1) and the collecting barrel (32), so that the two scrapers (31) scrape the precipitated impurities into the collecting barrel (32), and the scraping structure can be driven when the scraping structure is in operation.

2. A pneumatic ceramic rotary valve based on a ceramic valve core according to claim 1, characterized in that: The reduction structure further comprises a circular groove (14) arranged on a side of the first valve flap (12) close to the liquid inlet pipe (2), the ceramic valve core (15) being slidably arranged in the circular groove (14), the ceramic valve core (15) cooperating with one end of the liquid inlet pipe (2) for closing the liquid inlet pipe (2), a circular cavity (17) being arranged in the first valve flap (12), a sliding rod (16) being fixed on a side of the ceramic valve core (15) away from the liquid inlet pipe (2), one end of the sliding rod (16) extending into the circular cavity (17) in a sealing manner, a sliding ring (18) sliding in the circular cavity (17) being fixedly sleeved on the outer wall of the sliding rod (16), a first spring (19) being fixed on a side of the sliding ring (18) away from the ceramic valve core (15), and one end of the first spring (19) being in contact with one end of the circular cavity (17). The first spring (19) is sleeved on the outer wall of the sliding rod (16); the ceramic valve core (15) and the first spring (19) cooperate to convert the impact force of the water flow into the potential energy of the compression of the first spring (19); a second fixed rod (39) is fixed to the bottom of the cylinder (38); the first piston plate (40) is sealingly slidable in the cylinder (38); the first piston plate (40) is sealingly slidably sleeved on the outer wall of the second fixed rod (39); a third spring (41) is fixed between the bottom of the first piston plate (40) and the inner wall of the bottom of the cylinder (38); the third spring (41) is sleeved on the outer wall of the second fixed rod (39); the first piston plate (40) and the third spring (41) cooperate to convert the impact force of the water flow into the potential energy of the compression of the third spring (41).

3. A pneumatic ceramic rotary valve based on a ceramic valve core according to claim 2, characterized in that: The closed structure further comprises an annular groove (20) arranged on a side of the first valve flap (12) close to the liquid inlet pipe (2), a circular ring (21) being slidably connected in the annular groove (20), a side of the annular groove (20) close to the liquid inlet pipe (2) being fixedly connected to a rubber closed ring (22), the circular cone (24) being fixed to the outer wall of the sliding rod (16) and being located in the circular cavity (17), a plurality of clearance grooves (25) being arranged in the circular ring (21), a plurality of the clearance grooves (25) being each provided with a trapezoidal plate (23), the ends of the plurality of the trapezoidal plates (23) being close to each other all being sealed and slidably extended into the circular cavity (17), and the trapezoidal plates (23) being located in the sliding ring (18). and a truncated cone (24), the inclined surface of the truncated cone (24) cooperates with the inclined surface of the trapezoidal plate (23), the inner walls of the two sides of the plurality of the giving way grooves (25) away from each other are provided with inclined grooves (26), the plurality of the trapezoidal plates (23) are fixed with pins (27) passing through, and the two ends of the pins (27) respectively extend into the corresponding inclined grooves (26), the trapezoidal plate (23) is used to control the movement of the ring (21) through the cooperation of the inclined grooves (26) and the pins (27), and a plurality of second springs (28) are fixed on the side of the ring (21) away from the rubber sealing ring (22), and one end of the plurality of second springs (28) is fixedly connected to the inner wall of one side of the annular groove (20).

4. A pneumatic ceramic rotary valve based on a ceramic valve core according to claim 3, characterized in that: The scraping structure comprises a rotating shaft (33) rotating in the collecting barrel (32), and the top end of the rotating shaft (33) extends into the valve body (1); the outer wall of the rotating shaft (33) is fixedly sleeved with a second gear (34) located in the valve body (1); a second rack (35) is fixed on the side of the two scrapers (31) close to each other; the sides of the two second racks (35) close to each other are meshed with the second gear (34); the rotating shaft (33) drives the two scrapers (31) to move towards each other through the cooperation of the second gear (34) and the second rack (35); a transmission box (37) is fixed at the bottom of the collecting barrel (32); the bottom end of the rotating shaft (33) is sealed and rotates through the bottom of the collecting barrel (32) and extends to the transmission box (37). A third gear (45) is fixed to the bottom end of the rotating shaft (33), a second piston plate (43) is sealingly and slidably connected to the transmission box (37), a third rack (44) is fixed to the side of the second piston plate (43) away from the liquid inlet pipe (2), the third rack (44) is meshed with the third gear (45), a connecting pipe (42) is fixedly connected to the bottom end of the cylinder (38), one end of the connecting pipe (42) is connected to the transmission box (37) for injecting air in the cylinder (38) into the transmission box (37) and driving the second piston plate (43) to move in the direction of the third gear (45), and two limit blocks (46) are fixed to the inner wall of the bottom of the second gear (34) for limiting the movement of the second piston plate (43).

5. The pneumatic ceramic rotary valve based on a ceramic valve core according to claim 4 is characterized in that: A box body (6) is fixed to the inner wall at the top of the valve body (1); one end of the valve shaft (10) is sealed and rotatably penetrates the box body (6); a lifting plate (7) is slidably connected inside the box body (6); a first rack (9) is fixed to the bottom of the lifting plate (7); a first gear (11) located inside the box body (6) is fixedly sleeved on the outer wall of the valve shaft (10); and the first gear (11) is meshed with the first rack (9); a connecting frame (4) is fixed to the top of the valve body (1); a cylinder (5) is fixed to the top of the connecting frame (4); a valve stem (8) is fixed to the output shaft of the cylinder (5); and the bottom end of the valve stem (8) is sealed and slidably extended into the valve body (1) and is fixedly connected to the top of the lifting plate (7) for driving the first rack (9) to rise and fall.

6. A pneumatic ceramic rotary valve based on a ceramic valve core according to claim 5, characterized in that: A first fixing rod (29) is fixed to the bottom of the box body (6), and a support plate (30) is fixed to the bottom end of the first fixing rod (29). The two ends of the support plate (30) respectively contact the sides of the first valve flap (12) and the second valve flap (13) that are close to each other, so as to support the first valve flap (12) when the water flow impacts the first valve flap (12). The tops of the two scrapers (31) and the second rack (35) are slidably connected to the bottom of the support plate (30), so as to increase the stability of the movement of the scrapers (31) and the second rack (35).

7. The pneumatic ceramic rotary valve based on a ceramic valve core according to claim 6, characterized in that: A first sealing plug (36) is threadedly connected to one side of the collecting cylinder (32) for discharging impurities.

8. The pneumatic ceramic rotary valve based on a ceramic valve core according to claim 7, characterized in that: An oil storage box (49) is fixedly provided in the box body (6) and is located below the lifting plate (7) for storing lubricating oil. The top end of the oil storage box (49) is fixedly connected to an oil filling pipe (50), and the top end of the oil filling pipe (50) is fixedly passed through the valve body (1). A plurality of oil leakage holes (48) are provided at the bottom of the oil storage box (49) for dripping the lubricating oil in the oil storage box (49) onto the valve shaft (10) and the first gear (11) through the oil leakage holes (48). A sealing plate (52) for sealing the oil leakage holes (48) is sealingly and slidably connected in the oil storage box (49). The oil storage box (49) is provided with a sealing plate (52) for sealing the oil leakage holes (48). A plurality of U-shaped rods (51) are slidably penetrated through the top of the closure plate (9), one end of each of the plurality of U-shaped rods (51) is fixedly connected to the top of the closing plate (52), the top end of the rotating shaft (33) rotates through the supporting plate (30) and the first fixing rod (29) in sequence and extends into the box body (6), a triangular bar (47) is fixed to the top end of the rotating shaft (33), the other bottom end of the U-shaped rod (51) is in an arc shape, the triangular bar (47) cooperates with the bottom end of the U-shaped rod (51) in an arc shape, and is used to drive the U-shaped rod (51) to move upward and release the sealing of the oil leakage hole (48).

9. The pneumatic ceramic rotary valve based on a ceramic valve core according to claim 8, characterized in that: A plurality of load-bearing blocks (53) are fixed on the top of the closing plate (52), and the plurality of load-bearing blocks (53) are respectively fixedly sleeved on the outer wall of the U-shaped rod (51) so as to enable the closing plate (52) to re-close the oil leakage hole (48) under the action of the gravity of the U-shaped rod (51) and the load-bearing blocks (53).

10. A method for using a pneumatic ceramic rotary valve based on a ceramic valve core, applied to the pneumatic ceramic rotary valve based on a ceramic valve core as claimed in claim 9, characterized in that: The following steps are involved: S1. When it is necessary to control the closing and opening of the liquid inlet pipe (2) and the liquid outlet pipe (3), the valve stem (8) is driven to rise and fall by the cylinder (5), and the valve stem (8) drives the first rack (9) to rise and fall through the lifting plate (7). The first rack (9) cooperates with the first gear (11) to drive the first valve flap (12) and the second valve flap (13) to rotate, thereby controlling the closing and opening of the liquid inlet pipe (2) and the liquid outlet pipe (3). When the liquid inlet pipe (2) and the liquid outlet pipe (3) are closed, the two ends of the support plate (30) respectively touch the side where the first valve flap (12) and the second valve flap (13) are close to each other, so as to support the first valve flap (12) and the second valve flap (13) to prevent the first valve flap (12) from being deformed under the action of water hammer; S2, when the first valve flap (12) closes the liquid inlet pipe (2), the water flow in the pipe connected to the liquid inlet pipe (2) impacts the first valve flap (12) under the water hammer effect, and the water flow impacts the ceramic valve core (15), and the ceramic valve core (15) drives the sliding rod (16), the sliding ring (18) and the frustum (24) to move under the impact of the water flow, and the first spring (19) is compressed to store energy, thereby converting the impact force of the water flow into the potential energy of the first spring (19), thereby playing a buffering role; when the frustum (24) moves, the inclined surface on one side cooperates with the inclined surface of the trapezoidal plate (23) to squeeze the trapezoidal plate (23) outward, and the trapezoidal plate (23) drives the ring (21) and the rubber sealing ring (22) to move in the direction of the liquid inlet pipe (2) under the cooperation of the pin rod (27) and the inclined groove (26), thereby increasing the sealing between the first valve flap (12) and the liquid inlet pipe (2); S3. In addition, when the first valve flap (12) closes the liquid inlet pipe (2), water flows into the liquid inlet pipe (2) under the action of water hammer, gathers and impacts the first valve flap (12). Since the first valve flap (12) is closed, the water in the liquid inlet pipe (2) enters the cylinder (38) and pushes the first piston plate (40) to squeeze the third spring (41), converting the impact force of the water flow into the potential energy of the compression of the third spring (41), further buffering the water flow. When the first piston plate (40) moves downward, it squeezes the air into the transmission box (37) through the connecting pipe (42) and enters the transmission box. The air in the (37) pushes the second piston plate (43) and the third rack (44) to move, and the cooperation between the third rack (44) and the third gear (45) drives the rotating shaft (33) to rotate. The two scrapers (31) move toward each other in cooperation with the second rack (35) and the second gear (34) to scrape the precipitated impurities into the collecting tube (32), and then loosen the first sealing plug (36) to discharge the impurities inside. When the water hammer effect disappears, the third spring (41) pushes the first piston plate (40) to move upward and reset, and at this time, the two scrapers (31) are reset synchronously. S4. In addition, when the rotating shaft (33) rotates and scrapes off impurities, the rotating shaft (33) synchronously drives the triangular bar (47) to rotate. The inclined surface of the triangular bar (47) cooperates with the arc surface at the bottom of the U-shaped rod (51) to drive the U-shaped rod (51) and the closing plate (52) to move upward. The closing plate (52) releases the sealing of the oil leakage hole (48). The lubricating oil stored in the oil storage box (49) drips onto the valve shaft (10) and the first gear (11) through the oil leakage hole (48) to complete the lubrication operation, so that the first valve flap (12) and the second valve flap (13) can be opened and closed more smoothly. Later, after the rotating shaft (33) and the triangular bar (47) rotate in the opposite direction to reset, the closing plate (52) re-closes the oil leakage hole (48) under the gravity of the bearing block (53) and the U-shaped rod (51).

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