A nested zero-leakage sand-proof flat gate valve

Abstract

The present invention discloses a nested zero-leakage anti-sand flat gate valve, and the present invention relates to the technical field of flat gate valves. The present invention includes a fixed plate, which is symmetrically arranged inside the valve body, and the sides of the two fixed plates that are far away from each other are fixedly connected to the inner wall of the valve body, and the insides of the two fixed plates are fixedly connected with ring plates, and the sides of the two ring plates that are close to each other are provided with ring grooves, and the inner walls of the two ring grooves are slidably connected with slide cylinders, and the sides of the slide cylinders that are far away from the ring plates are fixedly connected with valve seats, and the valve seats are arranged outside the fixed plates, and the sides of the two valve seats that are close to each other are arranged as slopes, and only the valve seats are arranged outside the fixed plates, and other parts are nested inside the fixed plates, and will not contact with the gravel inside the conveying medium, which can effectively prevent gravel from blocking the valve seat, and prevent gravel from causing the gate valve to open and close. The torque force increases, reduce the wear between the valve seat and the gate plate, and further extend the service life of the gate valve.

Description

Technical Field

[0001] The invention relates to the technical field of flat gate valves, and in particular to a nested zero-leakage sand-proof flat gate valve. Background Art

[0002] The flat gate valve is a sliding valve with a parallel gate as the closing part. The closing part can be a single gate or a double gate with a propping mechanism in between. The pressing force of the gate to the valve seat is controlled by the medium pressure acting on the floating gate or floating valve seat. The flat gate valve can be divided into manual flat gate valve, pneumatic flat gate valve and electric flat gate valve according to the driving mode. It can be divided into flat gate valve with diversion hole, flat gate valve without diversion hole, oilfield flat gate valve, pipeline flat gate valve and gas flat gate valve according to the purpose and occasion of use.

[0003] With the development of offshore oil industry technology and the increase in the depth of offshore oil fields, underwater production systems have become increasingly popular around the world due to their own advantages: low development cost, short construction period, high development benefits and high safety. Subsea flat gate valves are common components of underwater production systems and are also key unit equipment for controlling subsea oil and gas switches in underwater wellhead devices, underwater Christmas trees and underwater manifold systems. The reliability and stability of the valve seat seal directly affects the life and switching torque of underwater flat gate valves.

[0004] Oil vapor often contains gravel, which can easily enter the gap between the valve seat and the valve body, causing the valve seat to be unable to float, increasing the opening and closing torque of the flat gate valve, accelerating the wear between the valve seat and the valve plate, and shortening the service life of the flat gate valve. Therefore, we proposed a nested zero-leakage sand-proof flat gate valve. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a nested zero-leakage anti-sand flat gate valve, comprising a valve body, a shell is fixedly connected to the top of the valve body, a gate plate is limitedly slidably provided on the inner wall of the shell, a sand prevention mechanism is arranged inside the valve body, and a buffer mechanism is arranged inside the shell;

[0006] The sand-proof mechanism comprises a fixed plate, and the fixed plate is symmetrically arranged inside the valve body, and the sides of the two fixed plates that are far away from each other are fixedly connected to the inner wall of the valve body, and the insides of the two fixed plates are fixedly connected with ring plates, and the sides of the two ring plates that are close to each other are provided with ring grooves, and the inner walls of the two ring grooves are slidably connected with sliding cylinders, and the side of the sliding cylinder that is away from the ring plate is fixedly connected with a valve seat, the valve seat is arranged outside the fixed plate, and the sides of the two valve seats that are close to each other are arranged as slopes, and a buffer component is arranged inside the valve seat, and the buffer component is arranged on the side away from the gate plate. When the gate valve is closed, the gate plate slides into the inside of the valve body. Since the sides of the two valve seats that are close to each other are arranged as slopes, when the gate plate squeezes the valve seat, the valve seat will The vertical force component generated means that the pressure on the valve seat is reduced, thereby reducing the friction between the gate and the valve seat, extending the service life of the gate valve, and the valve seat moves, driving the slide to move to the inside of the ring groove. The ring groove acts as a limiter to prevent the valve seat from offset. Only the valve seat is set outside the fixed plate, and other parts are nested inside the fixed plate. They will not contact with the gravel inside the conveying medium, which can effectively prevent the valve seat from being stuck by gravel and increase the torque for opening and closing the gate valve due to gravel, reduce the wear between the valve seat and the gate, and further extend the service life of the gate valve. Finally, the valve seat moves to the inside of the fixed plate. At the same time, the movable valve seat allows the valve seat to fit tightly against gates of various thicknesses and can effectively seal the worn gate.

[0007] Furthermore, a sliding seat is fixedly connected to the outer surface of the ring plate, and a plurality of sliding seats are arranged along the circumference of the ring plate, the inner walls of the plurality of sliding seats are slidably connected to a limiting rod, and the end of the limiting rod away from the sliding seat is fixedly connected to the valve seat, and by arranging a plurality of sliding seats to cooperate with the limiting rod, the circumferential rotation of the sliding seat is limited, and the rotation of the sliding seat is avoided when the gate plate is inserted into the gap between the two sliding seats, thereby further avoiding friction between the gate plate and the valve seat, and further extending the service life of the gate valve.

[0008] Furthermore, a return spring is provided inside the annular groove, and the return spring is fixedly connected to the inner wall of the annular groove, and one end of the return spring away from the ring plate is fixedly connected to the slide cylinder. By providing the return spring, the valve seat is located inside the fixed plate under the influence of the elastic force of the return spring, which can effectively prevent the valve seat from being stuck by gravel and reduce valve seat wear. The gate plate squeezes the valve seat, and the valve seat compresses the return spring. Under the elastic force of the return spring, the valve seat is tightly against the gate plate, thereby improving the sealing effect of the valve seat. When the gate valve is opened and the gate plate leaves the valve seat, the valve seat is reset under the action of the return spring.

[0009] Furthermore, limit plates are symmetrically arranged on both sides of the gate plate, and the sides of the two limit plates away from each other are fixedly connected to the inner wall of the valve body, and the gate plate close to the two limit plates has limit grooves, and the limit grooves are arranged in a stepped shape, and the limit plates are slidably connected to the inner walls of the limit grooves. When the gate plate is used for a long time, the gravel inside the medium will wear the gate plate, and the medium flows unidirectionally inside the gate valve, which will cause different degrees of wear on both sides of the gate plate, resulting in different sealing effects on both sides of the gate plate, causing the sealing effect to decrease. By setting the limit grooves, the gate plate is restricted to always be in the middle of the two valve seats, so that the gate plate will not be deformed to one side due to the pressure of the medium, thereby reducing the difference in the degree of wear on both sides, reducing the difference in sealing effects on both sides of the gate plate, and avoiding leakage on one side of the gate plate. Moreover, the stepped limit grooves can form multi-layer seals to avoid leakage of the medium from both sides of the gate plate.

[0010] Furthermore, the buffer assembly includes a base, and the base is fixedly connected to a side of the valve body away from the outer shell, the inner wall of the base is fixedly connected with a rubber pad, and positive spring plates are symmetrically arranged inside the rubber pad, both ends of the two positive spring plates are fixedly connected to the inner wall of the rubber pad, and the positive spring plates are arranged in the middle of the rubber pad, and the gate plate continues to move downward and finally contacts the rubber pad. The rubber pad is made of rubber and can form a good seal when contacting the gate plate, and the positive spring plate is compressed and deformed, which can buffer the gate plate to prevent the gate plate from hitting the inner wall of the valve body when it is closed quickly, thereby preventing the gate plate from being damaged.

[0011] Furthermore, the rubber pad is provided with side spring plates inside, and two groups of the side spring plates are symmetrically arranged on both sides of the positive spring plate, and the number of side spring plates in each group is symmetrically arranged at two, and both ends of the side spring plates are fixedly connected to the inner wall of the rubber pad, and grooves are symmetrically opened on both sides of the inner wall of the base, and the grooves are adapted to the gate plate, and the symmetrical side spring plates support both sides of the rubber pad, thereby supporting the rubber pad into an arc shape, so that the rubber pad can better support the bottom of the gate plate, and the two side spring plates are compressed and deformed, which further buffers the gate plate and prevents the gate plate from hitting the inner wall of the valve body and causing damage to the gate plate, and by opening a groove body adapted to the gate plate, the gate plate is limited after entering the base to prevent the gate plate from shifting inside the base.

[0012] Furthermore, the buffer mechanism includes a top plate, which is fixedly connected to a side of the shell away from the valve body, and the gate plate passes through the top plate and extends to the outside of the shell. A limiting component is arranged inside the shell, and the top plate seals the top of the shell to prevent gravel from entering the shell. The limiting component limits the gate plate to prevent the gate plate from hitting the bottom of the valve body due to excessive travel and causing damage.

[0013] Furthermore, a threaded rod is fixedly connected to one side of the gate plate located outside the shell, a threaded sleeve is provided on the outside of the threaded rod, and the threaded sleeve is threadedly connected to the threaded rod, and a handwheel is fixedly connected to the outer surface of the threaded sleeve. When opening and closing the gate valve, the handwheel is driven to rotate, and the rotation of the handwheel drives the threaded sleeve to rotate, and the rotation of the threaded sleeve drives the threaded rod to rotate. Since the threaded rod is threadedly connected to the threaded sleeve, the rotation of the threaded rod drives the gate plate to move, so as to complete the opening and closing of the gate valve. A threaded barrel is provided on the outside of the threaded rod, and one end of the threaded barrel close to the handwheel extends into the inside of the threaded sleeve, and one end of the threaded barrel extending into the inside of the threaded sleeve rotates with the threaded sleeve within a limited position, and one end of the threaded barrel away from the threaded sleeve is fixed to the outside, thereby limiting the axial movement of the threaded sleeve, ensuring that the threaded rod can smoothly drive the gate plate to move, and the threaded barrel can also prevent the threaded rod from contacting the external environment, thereby preventing gravel from entering the inside of the threaded rod and causing the threaded rod to be stuck.

[0014] Furthermore, the limiting assembly includes a spring barrel, and the spring barrel is fixedly connected to a side of the top plate close to the outer shell, an end of the spring barrel away from the top plate is fixedly connected to the fixed plate, and the length of the spring barrel is the same as that of the gate plate, an outer sleeve of the spring barrel is provided with an outer spring, and the outer spring is fixedly connected to the outer surface of the fixed plate, an end of the outer spring away from the fixed plate is fixedly connected to a pressure plate, and the pressure plate is slidably connected to the outer surface of the spring barrel, the outer surface of the pressure plate is fixedly connected to the gate plate, the movement of the gate plate drives the pressure plate to move, the movement of the pressure plate compresses the outer spring, and further buffers the movement of the gate plate, and the length of the spring barrel is the same as that of the gate plate, when the pressure plate moves to the bottom of the spring barrel, it cannot continue to move, and the gate plate cannot continue to move, thereby limiting the gate plate to prevent the gate plate from continuing to move under the drive of the threaded rod, thereby preventing the gate plate from excessively squeezing the inner wall of the valve body and causing damage, so as to achieve rapid closing of the gate plate.

[0015] Furthermore, an inner spring is fixedly connected to the bottom of the inner wall of the spring cylinder, and a spring groove is symmetrically provided on the outer surface of the spring cylinder. A spring plate is fixedly connected to one end of the inner spring close to the top plate, and the spring plate is slidably connected to the spring groove. The outer surface of the spring plate is fixedly connected to the inner wall of the pressure plate. The pressure plate moves, driving the spring plate to slide inside the spring groove. At the same time, the inner spring is compressed, which further buffers the movement of the gate plate to avoid shaking of the gate plate when it moves, aggravating the wear of the gate plate, thereby increasing its service life. The outer spring and the inner spring are respectively arranged inside and outside the spring cylinder, which can provide greater buffering for the gate plate within a limited length and effectively avoid vibration of the gate plate. The spring cylinder prevents the outer spring and the inner spring from bending when they are compressed, further enhances the buffering elastic force, and prevents the two from contacting, thereby avoiding entanglement and jamming between the outer spring and the inner spring.

[0016] The present invention has the beneficial effects:

[0017] 1. The present invention is provided with a sand-proof mechanism. Since the side where the two valve seats are close to each other is provided with a slope, when the gate plate squeezes the valve seat, the valve seat will be subjected to a component force in the vertical direction. The generation of the vertical component force means that the pressure on the valve seat is reduced, thereby reducing the friction between the gate plate and the valve seat and extending the service life of the gate valve. Only the valve seat is arranged outside the fixed plate, and other parts are nested inside the fixed plate. They will not contact with the gravel inside the conveying medium, which can effectively prevent the gravel from blocking the valve seat and prevent the gravel from increasing the torque force for opening and closing the gate valve, thereby reducing the wear between the valve seat and the gate plate and further extending the service life of the gate valve.

[0018] 2. The present invention sets a limit groove. When the gate plate is used for a long time, the gravel inside the medium will wear the gate plate, and the medium flows unidirectionally inside the gate valve, which will cause different degrees of wear on both sides of the gate plate, resulting in different sealing effects on both sides of the gate plate, causing the sealing effect to decrease. By setting the limit groove, the gate plate is restricted to always be in the middle of the two valve seats, so that the gate plate will not be deformed to one side due to pressure from the medium, thereby reducing the difference in the degree of wear on both sides, reducing the difference in sealing effects on both sides of the gate plate, and avoiding leakage on one side of the gate plate. The stepped limit groove can form a multi-layer seal to avoid leakage of the medium from both sides of the gate plate.

[0019] 3. The present invention provides a buffer component, and symmetrical side spring plates support both sides of the rubber pad, thereby supporting the rubber pad into an arc shape, so that the rubber pad can better support the bottom of the gate plate, and the two side spring plates are compressed and deformed, further buffering the gate plate to prevent the gate plate from hitting the inner wall of the valve body and causing damage to the gate plate. By providing a groove body compatible with the gate plate, the gate plate is limited after entering the base to prevent the gate plate from shifting inside the base.

[0020] 4. The present invention sets a limit assembly, and the length of the spring cylinder is the same as that of the gate plate. When the pressure plate moves to the bottom of the spring cylinder, it cannot move further, and the gate plate cannot move further either, thereby limiting the gate plate and preventing it from continuing to move under the drive of the threaded rod, thereby preventing the gate plate from excessively squeezing the inner wall of the valve body and causing damage, thereby achieving rapid closing of the gate plate.

[0021] 5. The present invention provides a spring cylinder, and the outer spring and the inner spring are respectively arranged inside and outside the spring cylinder, which can provide greater buffering for the gate within a limited length and effectively avoid the vibration of the gate. The spring cylinder prevents the outer spring and the inner spring from bending when compressed, further enhances the buffering elastic force, and prevents the two from contacting, thereby avoiding entanglement and jamming between the outer spring and the inner spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a nested zero-leakage sand-proof flat gate valve according to the present invention;

[0023] Figure 2It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve body of the present invention;

[0025] Figure 4 This is a schematic diagram of the valve seat assembly structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the limiting groove structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the buffer assembly of the present invention;

[0028] Figure 7 This is a schematic diagram of the assembly structure of the buffer assembly of the present invention;

[0029] Figure 8 It is a schematic diagram of the cross-sectional structure of the housing of the present invention;

[0030] Fig. 9 It is a schematic diagram of the structure of the buffer mechanism of the present invention;

[0031] Fig.10 It is a schematic diagram of the spring tube structure of the present invention.

[0032] In the figure: 1. valve body; 2. gate; 3. anti-sand mechanism; 31. fixed plate; 32. ring plate; 33. valve seat; 34. slide seat; 35. limit rod; 36. ring groove; 37. return spring; 38. slide cylinder; 39. buffer assembly; 391. base; 392. rubber pad; 393. positive spring plate; 394. side spring plate; 395. groove body; 310. limit groove; 311. limit plate; 4. buffer mechanism; 41. top plate; 42. threaded rod; 43. threaded sleeve; 44. hand wheel; 45. threaded cylinder; 46. limit assembly; 461. spring cylinder; 462. outer spring; 463. inner spring; 464. spring groove; 465. spring plate; 466. pressure plate; 5. shell. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0034] Example 1, please refer to Figure 1-Figure 7The present invention is a nested zero-leakage anti-sand flat gate valve, comprising a valve body 1, a shell 5 is fixedly connected to the top of the valve body 1, a gate plate 2 is limitedly slidably provided on the inner wall of the shell 5, a sand prevention mechanism 3 is arranged inside the valve body 1, and a buffer mechanism 4 is arranged inside the shell 5;

[0035] The sand prevention mechanism 3 has a fixed plate 31, which is symmetrically arranged inside the valve body 1. The sides of the two fixed plates 31 that are away from each other are fixedly connected to the inner wall of the valve body 1. The insides of the two fixed plates 31 are fixedly connected with ring plates 32. The sides of the two ring plates 32 that are close to each other are provided with ring grooves 36. The inner walls of the two ring grooves 36 are slidably connected with slide cylinders 38. The side of the slide cylinder 38 that is away from the ring plate 32 is fixedly connected with a valve seat 33. The valve seat 33 is arranged outside the fixed plate 31, and the sides of the two valve seats 33 that are close to each other are set as slopes. A buffer component 39 is arranged inside the valve seat 33, and the buffer component 39 is arranged on the side away from the gate plate 2. When the gate valve is closed, the gate plate 2 slides into the inside of the valve body 1. Since the sides of the two valve seats 33 that are close to each other are set as slopes, when the gate plate 2 squeezes the valve seat 33, the valve seat 33 will be vertically pressed. The force in the direction of rotation generates a vertical force component, which means that the pressure on the valve seat 33 is reduced, thereby reducing the friction between the gate plate 2 and the valve seat 33, extending the service life of the gate valve, and the valve seat 33 moves, driving the slide cylinder 38 to move to the inside of the annular groove 36. The annular groove 36 plays a limiting role to prevent the valve seat 33 from deviating. Only the valve seat 33 is arranged on the outside of the fixed plate 31, and the other parts are nested in the inside of the fixed plate 31. They will not contact the gravel inside the conveying medium, which can effectively prevent the gravel from blocking the valve seat 33 and prevent the gravel from causing the gate valve to open and close. The torque force increases, the wear between the valve seat 33 and the gate plate 2 is reduced, and the service life of the gate valve is further extended. Finally, the valve seat 33 moves to the inside of the fixed plate 31. At the same time, the movable valve seat 33 enables the valve seat 33 to fit tightly against the gate plates 2 of various thicknesses, and can also effectively seal the worn gate plates 2.

[0036] A slide seat 34 is fixedly connected to the outer surface of the ring plate 32, and a plurality of slide seats 34 are arranged along the circumference of the ring plate 32. The inner walls of the plurality of slide seats 34 are slidably connected to the limit rod 35, and the end of the limit rod 35 away from the slide seat 34 is fixedly connected to the valve seat 33. By arranging a plurality of slide seats 34 and cooperating with the limit rod 35, the circumferential rotation of the slide seat 34 is limited, and the slide seat 34 is prevented from rotating when the gate plate 2 is inserted into the interval between two slide seats 34, thereby further avoiding friction between the gate plate 2 and the valve seat 33, and further extending the service life of the gate valve.

[0037] A return spring 37 is provided inside the annular groove 36, and the return spring 37 is fixedly connected to the inner wall of the annular groove 36. One end of the return spring 37 away from the ring plate 32 is fixedly connected to the slide cylinder 38. By providing the return spring 37, the valve seat 33 is located inside the fixed plate 31 under the influence of the elastic force of the return spring 37, which can effectively prevent the valve seat 33 from being stuck by gravel and reduce the wear of the valve seat 33. The gate plate 2 squeezes the valve seat 33, and the valve seat 33 compresses the return spring 37. Under the elastic force of the return spring 37, the valve seat 33 is tightly attached to the gate plate 2, thereby improving the sealing effect of the valve seat 33. When the gate valve is opened and the gate plate 2 leaves the valve seat 33, the valve seat 33 is reset under the action of the return spring 37.

[0038] Limiting plates 311 are symmetrically arranged on both sides of the gate plate 2, and the sides of the two limiting plates 311 that are away from each other are fixedly connected to the inner wall of the valve body 1. Limiting grooves 310 are provided on the sides of the gate plate 2 close to the two limiting plates 311, and the limiting grooves 310 are arranged in a stepped shape. The limiting plates 311 are slidably connected to the inner walls of the limiting grooves 310. When the gate plate 2 is used for a long time, the gravel inside the medium will wear the gate plate 2, and the unidirectional flow of the medium inside the gate valve will cause different degrees of wear on both sides of the gate plate 2, resulting in different sealing effects on both sides of the gate plate 2, causing the sealing effect to decrease. By setting the limiting grooves 310, the gate plate 2 is always limited to be in the middle of the two valve seats 33, so that the gate plate 2 will not be deformed to one side due to the pressure of the medium, thereby reducing the difference in the degree of wear on both sides, reducing the difference in the sealing effect on both sides of the gate plate 2, and avoiding leakage on one side of the gate plate 2. In addition, the stepped limiting grooves 310 can form multi-layer seals to avoid leakage of the medium from both sides of the gate plate 2.

[0039] The buffer assembly 39 includes a base 391, and the base 391 is fixedly connected to the side of the valve body 1 away from the shell 5. The inner wall of the base 391 is fixedly connected to a rubber pad 392. The inside of the rubber pad 392 is symmetrically provided with positive spring plates 393. Both ends of the two positive spring plates 393 are fixedly connected to the inner wall of the rubber pad 392, and the positive spring plates 393 are arranged in the middle of the rubber pad 392. The gate plate 2 continues to move downward and finally contacts the rubber pad 392. The rubber pad 392 is made of rubber and can form a good seal when in contact with the gate plate 2. The positive spring plates 393 are compressed and deformed, which can buffer the gate plate 2 to prevent the gate plate 2 from hitting the inner wall of the valve body 1 when it is closed quickly, thereby preventing the gate plate 2 from being damaged.

[0040] The rubber pad 392 is provided with side spring plates 394 inside. Two groups of side spring plates 394 are symmetrically provided on both sides of the positive spring plate 393. The number of side spring plates 394 in each group is symmetrically provided with two, and both ends of the side spring plates 394 are fixedly connected to the inner wall of the rubber pad 392. Grooves 395 are symmetrically provided on both sides of the inner wall of the base 391, and the grooves 395 are adapted to the gate plate 2. The symmetrical side spring plates 394 support both sides of the rubber pad 392, thereby supporting the rubber pad 392 into an arc shape, so that the rubber pad 392 can better support the bottom of the gate plate 2, and the two side spring plates 394 are compressed and deformed, further buffering the gate plate 2 to prevent the gate plate 2 from hitting the inner wall of the valve body 1 and causing damage to the gate plate 2. By providing a groove 395 adapted to the gate plate 2, the gate plate 2 is limited after entering the base 391 to prevent the gate plate 2 from offsetting inside the base 391.

[0041] Example 2, please refer to Figure 8-Figure 10 The buffer mechanism 4 includes a top plate 41, which is fixedly connected to the side of the shell 5 away from the valve body 1, and the gate plate 2 passes through the top plate 41 and extends to the outside of the shell 5. A limiting component 46 is arranged inside the shell 5. The top plate 41 seals the top of the shell 5 to prevent gravel from entering the shell 5. The limiting component 46 limits the gate plate 2 to prevent the gate plate 2 from hitting the bottom of the valve body 1 due to excessive travel and causing damage.

[0042] A threaded rod 42 is fixedly connected to one side of the gate plate 2 located outside the housing 5. A threaded sleeve 43 is sleeved on the outside of the threaded rod 42, and the threaded sleeve 43 is threadedly connected to the threaded rod 42. A hand wheel 44 is fixedly connected to the outer surface of the threaded sleeve 43. When opening and closing the gate valve, the hand wheel 44 is driven to rotate, and the rotation of the hand wheel 44 drives the threaded sleeve 43 to rotate, and the rotation of the threaded sleeve 43 drives the threaded rod 42 to rotate. Since the threaded rod 42 is threadedly connected to the threaded sleeve 43, the rotation of the threaded rod 42 drives the gate plate 2 to move, completing the opening and closing of the gate valve. A threaded barrel 45 is sleeved on the outside of the threaded rod 42, and one end of the threaded barrel 45 close to the hand wheel 44 extends into the inside of the threaded sleeve 43, and one end of the threaded barrel 45 extending into the inside of the threaded sleeve 43 is limited to rotate with the threaded sleeve 43, and one end of the threaded barrel 45 away from the threaded sleeve 43 is fixed to the outside, thereby limiting the threaded sleeve 43. The axial movement of the threaded rod 42 ensures that the gate plate 2 can be driven to move smoothly, and the threaded tube 45 can also prevent the threaded rod 42 from contacting the external environment, avoiding gravel from entering the threaded rod 42 and causing the threaded rod 42 to get stuck.

[0043] The limiting assembly 46 includes a spring barrel 461, and the spring barrel 461 is fixedly connected to the side of the top plate 41 close to the housing 5, the end of the spring barrel 461 away from the top plate 41 is fixedly connected to the fixed plate 31, and the length of the spring barrel 461 is the same as that of the gate plate 2, the outer sleeve of the spring barrel 461 is provided with an outer spring 462, and the outer spring 462 is fixedly connected to the outer surface of the fixed plate 31, and the end of the outer spring 462 away from the fixed plate 31 is fixedly connected to a pressure plate 466, and the pressure plate 466 is slidably connected to the outer surface of the spring barrel 461, and the pressure plate 466 is connected to the outer surface of the spring barrel 461. The outer surface of 6 is fixedly connected to the gate plate 2. The movement of the gate plate 2 drives the pressure plate 466 to move. The movement of the pressure plate 466 compresses the outer spring 462 to further buffer the movement of the gate plate 2. The length of the spring tube 461 is the same as that of the gate plate 2. When the pressure plate 466 moves to the bottom of the spring tube 461, it cannot move further, and the gate plate 2 cannot move further either, thereby limiting the gate plate 2 to prevent the gate plate 2 from continuing to move under the drive of the threaded rod 42, thereby preventing the gate plate 2 from excessively squeezing the inner wall of the valve body 1 and causing damage, so as to achieve rapid closing of the gate plate 2.

[0044] The inner wall bottom of the spring cylinder 461 is fixedly connected with an inner spring 463, and the outer surface of the spring cylinder 461 is symmetrically provided with a spring groove 464. The end of the inner spring 463 close to the top plate 41 is fixedly connected with a spring plate 465, and the spring plate 465 is slidably connected with the spring groove 464. The outer surface of the spring plate 465 is fixedly connected with the inner wall of the pressure plate 466. The pressure plate 466 moves, driving the spring plate 465 to slide inside the spring groove 464. At the same time, the inner spring 463 is compressed, further buffering the movement of the gate plate 2. , to avoid shaking of the gate plate 2 when it moves, aggravating the wear of the gate plate 2, thereby increasing its service life, and the outer spring 462 and the inner spring 463 are respectively arranged inside and outside the spring tube 461, which can provide greater buffering for the gate plate 2 within a limited length, and can effectively avoid the vibration of the gate plate 2. The spring tube 461 prevents the outer spring 462 and the inner spring 463 from bending when they are compressed, further enhancing the buffering elastic force, and preventing the two from contacting, thereby avoiding entanglement and jamming between the outer spring 462 and the inner spring 463.

[0045] When closing the gate valve, the hand wheel 44 is driven to rotate, and the rotation of the hand wheel 44 drives the threaded sleeve 43 to rotate, and the rotation of the threaded sleeve 43 drives the threaded rod 42 to rotate. Since the threaded rod 42 is threadedly connected with the threaded sleeve 43, the threaded rod 42 drives the gate plate 2 to move at the same time, and the movement of the gate plate 2 drives the pressure plate 466 to move, and the pressure plate 466 moves to compress the outer spring 462. The pressure plate 466 moves, driving the spring plate 465 to slide inside the spring groove 464, and at the same time the inner spring 463 is compressed, and the gate plate 2 slides into the valve body 1. Inside, the gate 2 squeezes the valve seat 33, and the valve seat 33 is subjected to a vertical force component. The valve seat 33 moves, driving the slide 38 to move to the inside of the annular groove 36 and compressing the reset spring 37. Under the elastic force of the reset spring 37, the valve seat 33 is close to the gate 2, and the gate 2 continues to move downward, and finally contacts the rubber pad 392. The positive spring plate 393 is compressed and deformed, and the two side spring plates 394 are compressed and deformed, buffering the gate 2 to complete the closing of the gate valve, and reverse operation to complete the opening of the gate valve. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should belong to the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A nested zero-leakage anti-sand flat gate valve, comprising a valve body (1), a housing (5) fixedly connected to the top of the valve body (1), a gate plate (2) limitedly sliding on the inner wall of the housing (5), characterized in that: A sand prevention mechanism (3) is provided inside the valve body (1), and a buffer mechanism (4) is provided inside the housing (5); A sand prevention mechanism (3), wherein the sand prevention mechanism (3) comprises a fixed plate (31), the fixed plate (31) being symmetrically arranged inside the valve body (1), the two fixed plates (31) being fixedly connected to the inner wall of the valve body (1) on the sides away from each other, the two fixed plates (31) being fixedly connected to the inside of the two fixed plates (31), the two ring plates (32) being provided with an annular groove (36) on the sides close to each other, the inner walls of the two annular grooves (36) being slidably connected to a slide cylinder (38), the side of the slide cylinder (38) away from the annular plate (32) being fixedly connected to a valve seat (33), the valve seat (33) being arranged outside the fixed plate (31), and the sides of the two valve seats (33) being close to each other being arranged as a slope, a buffer component (39) being arranged inside the valve seat (33), and the buffer component (39) being arranged on the side away from the gate plate (2); The buffer mechanism (4) comprises a top plate (41), the top plate (41) being fixedly connected to a side of the housing (5) away from the valve body (1), and the gate plate (2) passing through the top plate (41) and extending to the outside of the housing (5), and a limit position assembly (46) being arranged inside the housing (5); A threaded rod (42) is fixedly connected to one side of the gate plate (2) located outside the housing (5); a threaded sleeve (43) is sleeved on the outside of the threaded rod (42), and the threaded sleeve (43) is threadedly connected to the threaded rod (42); a hand wheel (44) is fixedly connected to the outer surface of the threaded sleeve (43); a threaded barrel (45) is sleeved on the outside of the threaded rod (42); one end of the threaded barrel (45) close to the hand wheel (44) extends into the inside of the threaded sleeve (43); and one end of the threaded barrel (45) extending into the inside of the threaded sleeve (43) is limitedly rotated with the threaded sleeve (43).

2. A nested zero-leakage anti-sand flat gate valve according to claim 1, characterized in that: A sliding seat (34) is fixedly connected to the outer surface of the ring plate (32), and a plurality of sliding seats (34) are arranged along the circumference of the ring plate (32). The inner walls of the plurality of sliding seats (34) are all slidably connected to a limiting rod (35), and one end of the limiting rod (35) away from the sliding seat (34) is fixedly connected to the valve seat (33).

3. The nested zero-leakage anti-sand flat gate valve according to claim 1 is characterized by: A return spring (37) is disposed inside the annular groove (36). The return spring (37) is fixedly connected to the inner wall of the annular groove (36). One end of the return spring (37) away from the annular plate (32) is fixedly connected to the slide cylinder (38).

4. The nested zero-leakage anti-sand flat gate valve according to claim 1 is characterized by: Limiting plates (311) are symmetrically arranged on both sides of the gate plate (2), and the sides of the two limiting plates (311) that are away from each other are fixedly connected to the inner wall of the valve body (1). The gate plate (2) is provided with limiting grooves (310) on the sides close to the two limiting plates (311), and the limiting grooves (310) are arranged in a stepped shape. The limiting plates (311) are slidably connected to the inner wall of the limiting grooves (310).

5. The nested zero-leakage anti-sand flat gate valve according to claim 1 is characterized by: The buffer assembly (39) comprises a base (391), and the base (391) is fixedly connected to a side of the valve body (1) away from the housing (5), the inner wall of the base (391) is fixedly connected to a rubber pad (392), and positive spring plates (393) are symmetrically arranged inside the rubber pad (392), both ends of the two positive spring plates (393) are fixedly connected to the inner wall of the rubber pad (392), and the positive spring plates (393) are arranged in the middle of the rubber pad (392).

6. A nested zero-leakage anti-sand flat gate valve according to claim 5, characterized in that: The rubber pad (392) is provided with side spring plates (394) inside. Two groups of the side spring plates (394) are symmetrically arranged on both sides of the positive spring plate (393). The number of the side spring plates (394) in each group is symmetrically arranged, and both ends of the side spring plates (394) are fixedly connected to the inner wall of the rubber pad (392). Grooves (395) are symmetrically opened on both sides of the inner wall of the base (391), and the grooves (395) are adapted to the gate plate (2).

7. The nested zero-leakage anti-sand flat gate valve according to claim 1 is characterized by: The limiting assembly (46) comprises a spring barrel (461), and the spring barrel (461) is fixedly connected to a side of the top plate (41) close to the housing (5), and one end of the spring barrel (461) away from the top plate (41) is fixedly connected to the fixed plate (31), and the length of the spring barrel (461) is the same as that of the gate plate (2), an outer spring (462) is sleeved on the outside of the spring barrel (461), and the outer spring (462) is fixedly connected to the outer surface of the fixed plate (31), and one end of the outer spring (462) away from the fixed plate (31) is fixedly connected to a pressure plate (466), and the pressure plate (466) is slidably connected to the outer surface of the spring barrel (461), and the outer surface of the pressure plate (466) is fixedly connected to the gate plate (2).

8. The nested zero-leakage anti-sand flat gate valve according to claim 7 is characterized by: An inner spring (463) is fixedly connected to the bottom of the inner wall of the spring cylinder (461), and a spring groove (464) is symmetrically provided on the outer surface of the spring cylinder (461). A spring plate (465) is fixedly connected to one end of the inner spring (463) close to the top plate (41), and the spring plate (465) is slidably connected to the spring groove (464), and the outer surface of the spring plate (465) is fixedly connected to the inner wall of the pressure plate (466).

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