Gate valve with buffering function

Abstract

The invention relates to the technical field of valves, in particular to a gate valve with a buffering function, which comprises a valve body, an inlet end and an outlet end which are arranged on the valve body, and a gate plate which is arranged between the inlet end and the outlet end on the valve body in a lifting manner, the fixed circular plate is fixedly arranged on the valve body and located in the outlet end, the fixed rod is arranged on the left end face of the fixed circular plate, and the buffer circular plate is arranged on the fixed rod in a sliding mode and used for being pushed by water flow to slide rightwards on the fixed rod when the gate plate is opened. The compression buffer spring is arranged between the left end face of the fixed circular plate and the right end face of the buffer circular plate and used for buffering water flow impact when the buffer circular plate slides rightwards on the fixed rod and pushing the buffer circular plate to slide leftwards on the fixed rod when the gate plate is closed; an anti-falling plate is arranged at the position, located on the left side of the buffering circular plate, of the left end of the fixing rod and used for preventing the buffering circular plate from sliding leftwards on the fixing rod.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a gate valve with a buffering function. Background Art

[0002] The gate valve is a gate plate that opens and closes. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface will be welded with metal materials to increase wear resistance. The gate plate has a rigid gate plate and an elastic gate plate. According to the different gate plates, the gate valve is divided into a rigid gate valve and an elastic gate valve.

[0003] When the gate of a traditional gate valve is opened, the inertia of the water flow will accelerate rapidly, causing the pressure in the pipeline to change and produce pressure fluctuations. This pressure fluctuation is similar to the effect of a hammer, so it is called the water hammer effect. The water hammer effect will produce noise and vibration, affecting the service life of equipment and pipelines. Traditional gate valves only control the opening and closing of water flow by setting a gate. When the gate is opened, it is impossible to buffer the impact of the water flow, making it difficult to reduce the pressure fluctuations in the pipeline and the water hammer effect in the valve. Summary of the invention

[0004] The object of the present invention is to provide a gate valve with a buffering function in view of the defects and shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a gate valve with a buffering function, comprising a valve body, an inlet end and an outlet end arranged on the valve body, a gate plate which can be lifted and lowered and is arranged on the valve body between the inlet end and the outlet end, and also comprising a fixed circular plate fixedly arranged on the valve body and located inside the outlet end, a fixed rod arranged on the left end face of the fixed circular plate, a buffer circular plate slidably arranged on the fixed rod and used to be pushed by water flow to slide rightward on the fixed rod when the gate plate is opened, and a compression buffer spring arranged between the left end face of the fixed circular plate and the right end face of the buffer circular plate, the compression buffer spring being used to buffer the impact of water flow when the buffer circular plate slides rightward on the fixed rod, and pushing the buffer circular plate to slide leftward on the fixed rod when the gate plate is closed, and an anti-slip plate being arranged on the left end of the fixed rod at the left side of the buffer circular plate, the anti-slip plate being used to prevent the buffer circular plate from slipping leftward on the fixed rod; The buffer circular plate is provided with at least two through holes for allowing part of the water flow to pass through the buffer circular plate, a rotating column is rotatably provided on the buffer circular plate in the through hole, a buffer plate is provided on the rotating column in the through hole, one end of the buffer plate is fixedly provided on the rotating column, and a tension reset spring is provided between the other end of the buffer plate and the valve body; The buffer circular plate is provided with a mounting plate at one end close to the buffer plate, and a transverse sliding bar is slidably provided on the mounting plate, and the transverse sliding bar is transversely slidably arranged on the mounting plate, one end of the transverse sliding bar is close to the buffer plate, and the other end of the transverse sliding bar is away from the buffer plate. An elastic cover is provided on the mounting plate on the outside of the other end of the transverse sliding bar, and an elastic connecting block is provided between the elastic cover and the mounting plate. The other end of the transverse sliding bar is located in the elastic cover, and a limiting block is provided at the other end of the transverse sliding bar, and the limiting block is used to prevent the transverse sliding bar from slipping off the mounting plate, and both end surfaces of the transverse sliding bar are arc surfaces.

[0006] A further improvement is that the elastic cover is a rubber cover or a low-density polyethylene cover.

[0007] A further improvement is that the elastic connecting block is a rubber spring block.

[0008] A further improvement is that: the buffer plate is an arc-shaped buffer plate.

[0009] A further improvement is that: the left end surface of the buffer circular plate is provided with a plurality of auxiliary grooves, and the plurality of auxiliary grooves are arranged in an annular manner and at equal intervals on the buffer circular plate. Further improvements are: an inclined surface is provided on the outer circumferential side of the buffer circular plate, at least three extrusion sliding holes are equidistantly provided in an annular shape on the valve body, the lower end of each extrusion sliding hole is connected to the outlet end, each extrusion sliding hole is located at the end of the inclined surface, and an abutment block is provided in each extrusion sliding hole so as to be liftable, an extrusion spring is provided between the upper end of the abutment block and the valve body, the extrusion spring is located in the extrusion sliding hole, an anti-slip part is provided between the abutment block and the valve body, and the circumferential side of the buffer circular plate is located at the left end of the inclined surface and is a plane.

[0010] A further improvement is that at least three auxiliary through-holes are equidistantly arranged in an annular shape on the valve body, the number of the auxiliary through-holes is the same as the number of the extrusion sliding holes, the positions of the auxiliary through-holes correspond to the positions of the extrusion sliding holes, the lower ends of the auxiliary through-holes are communicated with the upper ends of the extrusion sliding holes, a lifting plate is provided in the extrusion sliding hole above the abutment block and can be lifted and lowered, the extrusion spring is provided at the lower end of the lifting plate and the upper end of the abutment block, the diameter of the auxiliary through-hole is smaller than the diameter of the extrusion sliding hole, an adjusting screw is connected through the inner thread of the auxiliary through-hole, the lower end of the adjusting screw abuts against the upper end of the lifting plate, a placement ring groove is provided in an annular shape on the side end surface of the lifting plate, a sealing ring is provided in the placement ring groove on the side end surface of the lifting plate, and the outer peripheral side of the sealing ring abuts against the inner wall of the extrusion sliding hole.

[0011] A further improvement is that at least three elastic sealing blocks are equidistantly arranged in an annular manner on the valve body, the number of the elastic sealing blocks is the same as the number of the extrusion sliding holes, the position of each elastic sealing block corresponds to that of each extrusion sliding hole, and the auxiliary perforations are opened on the elastic sealing blocks.

[0012] A further improvement is that the anti-slip component includes two anti-slip grooves symmetrically opened on the valve body and connected to the extrusion sliding hole, and two anti-slip blocks symmetrically arranged on the side end surface of the abutment block and loosely matched with the anti-slip grooves.

[0013] The further improvement is that: two driving handles are symmetrically arranged on the upper end of the adjusting screw, and the two driving handles are arranged on the circumferential side of the upper end of the adjusting screw; two locking plates are located on the valve body on the left and right sides of the adjusting screw; the ends of the two driving handles close to the locking plates are respectively provided with locking grooves; the driving handles are slidably provided with locking balls in the locking grooves; at least two locking circular grooves are respectively provided on the two locking plates; the two locking circular grooves are longitudinally arranged on the locking plates and close to the end of the driving handle; a locking push spring is arranged between the locking ball and the driving handle, and the locking push spring is located in the locking groove; a limited inner groove is provided on the driving handle on the left side of the locking groove; the limited inner groove is used to prevent the locking ball from detaching outwards; an arc chamfer is provided on the end of the driving handle close to the locking plate, and the arc chamfer is arranged on the front and rear sides of the driving handle.

[0014] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: when the control gate is opened, the water flow contacts the surface of the buffer circular plate to form a preliminary flow blocking effect, and pushes the buffer circular plate to move to the right on the fixed rod. At this time, the compression buffer spring slows down the force of the instantaneous rightward movement of the buffer circular plate, and part of the water flow contacting the surface of the buffer circular plate flows into the through hole. The water flow pushes the buffer plate to flip backward around the rotating column. When the buffer plate flips backward, the reset spring is stretched to produce elastic deformation, so that the buffer plate buffers the water flow passing through the through hole. When the buffer plate is flipped backward to a predetermined position by the instantaneous impact of the water flow, the back of the buffer plate contacts one end of the transverse sliding rod, thereby pushing the transverse sliding rod to move toward the end of the elastic cover, and elastic deformation is generated through the elastic cover and the elastic connecting block, thereby buffering the impact of the transverse sliding rod. When the water flow instantaneously impacts the buffer plate to flip backward, the buffer plate can be auxiliary buffered. The impact of the water flow can be buffered by setting a multiple structure, which can reduce the pressure fluctuation in the pipeline and reduce the water hammer effect in the valve.

[0015] Further effect: when the gate is closed, the water flow no longer pushes the buffer circular plate to move to the right, and the compression buffer spring releases elastic potential energy to push the buffer circular plate to move to the left on the fixed rod, and the anti-slip plate prevents the buffer circular plate from slipping to the left on the fixed rod. The tension reset spring releases elastic potential energy to pull the buffer plate to flip forward around the rotating column, thereby resetting the buffer plate and putting the through hole in a semi-shielded state, so as to prepare for subsequent buffering of the water flow; after the buffer plate is reset, the elastic cover and the elastic connecting block are no longer pushed by the transverse sliding rod, thereby releasing the elastic potential energy to push the transverse sliding rod to reset, and the limit block prevents the transverse sliding rod from slipping off the mounting plate.

[0016] Further effect: by setting the transverse slide bar, the backward flipping position of the buffer plate can be limited to prevent excessive flipping and reduce the service life of the tension return spring.

[0017] Further effect: the arc-shaped buffer plate can contact the water flow through the arc-shaped surface when the water flow passes through the through hole, thereby improving the pushing effect of the water flow on the buffer plate, and even when the buffer plate is flipped, it can still contact the water flow through the end of the arc-shaped surface.

[0018] Further effect: when the water flow contacts the left end surface of the buffer circular plate, the multiple auxiliary grooves can make it easier for the water flow to push the buffer circular plate to move to the right, thereby increasing the driving force of the water flow on the buffer circular plate.

[0019] Further effect: when the buffer circular plate is impacted by the water flow and moves to the right on the fixed rod, the inclined surface abuts against the lower end of the abutment block, and the abutment block gradually moves toward the end of the extrusion spring in the extrusion sliding hole as the buffer circular plate moves, thereby gradually compressing the extrusion spring to produce elastic deformation. In this process, the extrusion force between the abutment block and the inclined surface gradually increases, thereby gradually increasing the resistance of the buffer circular plate to move to the right, which can reduce the force of the water flow instantly pushing the buffer circular plate to move to the right when the gate is opened, thereby improving the buffering effect of the buffer circular plate on the water flow; When the gate is closed, the compression buffer spring pushes the buffer circular plate to move to the left. At this time, the inclined surface gradually reduces the extrusion force with the abutment block, and the extrusion spring gradually releases the elastic potential energy to push the abutment block to reset. In this process, the resistance of the buffer circular plate to move to the left will not be increased, so that the buffer circular plate can be reset smoothly. When the buffer circular plate moves rightward on the fixed rod due to the impact of water flow, the distributed contact between the multiple abutment blocks arranged equidistantly in an annular shape and the inclined surface is improved to improve the ability of the buffer circular plate to maintain horizontal movement and reduce the occurrence of tilting of the buffer circular plate due to the impact of water flow.

[0020] Further effect: when it is necessary to adjust the extrusion pressure of the abutment block on the inclined surface according to the flow rate, the adjusting screw is moved downward or upward in the auxiliary perforation by turning the adjusting screw forward or backward. When the adjusting screw moves downward, the adjusting screw abuts against the upper end of the lifting plate and moves downward, thereby pushing the lifting plate to move toward the end of the extrusion spring, so that the extrusion spring is gradually compressed to increase the driving force on the abutment block; when the adjusting screw moves upward, the extrusion spring gradually releases its elastic potential energy to push the lifting plate to abut against the lower end of the adjusting screw, so that the lifting plate follows the adjusting screw to move upward, reducing the driving force of the extrusion spring on the abutment block.

[0021] Further effect: the sealing ring on the side end face of the lifting plate abuts against the inner wall of the extrusion slide hole. When the lifting plate is lifted or lowered in the extrusion slide hole, the sealing ring continuously abuts against the inner wall of the extrusion slide hole. The position of the sealing ring can be limited by placing an annular groove to prevent the sealing ring from detaching from the side end face of the lifting plate. The gap between the lifting plate and the extrusion slide hole is sealed by the sealing ring to reduce medium leakage.

[0022] Further effect: the adjusting screw is threadedly connected to the elastic sealing block, and the sealing effect of the adjusting screw is improved and leakage is reduced through the material matching of the thread surface and the elastic sealing block.

[0023] Further effect: when it is necessary to adjust the squeezing force of the abutment block on the inclined surface according to the flow rate, the two driving handles are turned circumferentially by hand to drive the adjusting screw to rotate. When the adjusting screw rotates circumferentially, the two driving handles move circumferentially in the two positioning plates. When the positioning ball contacts the positioning plate, the positioning ball moves inward in the positioning slide groove and squeezes the positioning push spring. When the positioning ball is out of contact with the positioning plate, the positioning push spring pushes the positioning ball out and prevents the positioning ball from being outwardly disengaged through the limiting inner groove. As the adjusting screw rotates, the two driving handles will be driven to move upward or downward on the valve body, and two locking circular grooves are longitudinally arranged on each locking plate. When the positions of the locking ball and the locking circular groove correspond, the locking push spring pushes the locking ball out to engage with the locking circular groove. At this time, there is a certain resistance to the rotation of the adjusting screw, which can provide the operator with a position prompt.

[0024] Further effect: the arc chamfer can prevent the front and rear sharp corners from contacting the positioning plate and affecting the movement of the driving handles when the two driving handles move circumferentially. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a front cross-sectional view of the valve body and the gate plate in the present invention; Figure 2 It is a cutaway view of the valve body and the outlet end in the present invention; Figure 3 It corresponds to Figure 2 Another state diagram of ; Figure 4 It is a left side view of the buffer circular plate in the present invention; Figure 5 It is a front view cutaway view of the buffer circular plate and the through hole in the present invention; Figure 6 It is a front view cutaway view of the buffer circular plate and the auxiliary groove in the present invention; Figure 7 It is a top view cutaway view of the clamping plate and the clamping circular groove in the present invention; Figure 8 It corresponds to Figure 5 A magnified view of part A; Fig. 9 It is a front view cutaway diagram of the valve body, the abutment block, the extrusion spring, the lifting plate, and the adjusting screw in the present invention; Fig.10 It corresponds to Fig. 9 Enlarged view of part B.

[0027] Explanation of the reference numerals in the accompanying drawings: valve body 1, inlet end 2, outlet end 3, gate plate 4, fixed circular plate 5, fixed rod 6, buffer circular plate 7, compression buffer spring 8, anti-slip plate 9, through hole 10, rotating column 11, buffer plate 12, tension reset spring 13, mounting plate 14, transverse slide bar 15, elastic cover 16, elastic connecting block 17, limit block 18, auxiliary groove 19, inclined surface 20, extrusion slide hole 21, abutment block 22, extrusion spring 23, auxiliary through hole 24, lifting plate 25, adjusting screw 26, placement ring groove 27, sealing ring 28, elastic sealing block 29, anti-slip groove 30, anti-slip block 31, driving handle 32, positioning slide groove 33, positioning ball 34, positioning circular groove 35, positioning push spring 36, limiting inner groove 37, positioning plate 38. DETAILED DESCRIPTION

[0028] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0029] See also Figures 1 to 10As shown, the technical solution adopted in this specific embodiment is: a gate valve with a buffer function, comprising a valve body 1, an inlet end 2 and an outlet end 3 arranged on the valve body 1, a gate plate 4 which can be lifted and lowered and is located between the inlet end 2 and the outlet end 3 on the valve body 1, and also comprising a fixed circular plate 5 fixedly arranged on the valve body 1 and located inside the outlet end 3, a fixed rod 6 arranged on the left end surface of the fixed circular plate 5, a buffer circular plate 7 slidably arranged on the fixed rod 6 and used to be pushed by water flow to slide rightward on the fixed rod 6 when the gate plate 4 is opened, and a buffer circular plate 7 arranged on the left end surface of the fixed circular plate 5 and the ... The compression buffer spring 8 between the right end faces of the impact disc 7 is used to buffer the impact of water flow when the buffer disc 7 slides to the right on the fixed rod 6, and pushes the buffer disc 7 to slide to the left on the fixed rod 6 when the gate 4 is closed. The left end of the fixed rod 6 is located on the left side of the buffer disc 7 and is provided with an anti-slip plate 9, which is used to prevent the buffer disc 7 from slipping to the left on the fixed rod 6; the peripheral side of the fixed disc 5 is fixedly connected to the inner wall of the valve body 1 through a plurality of connecting rods, and the position of the connecting rod is staggered with the position of the buffer plate 12, which can correspond to the position of the auxiliary groove 19. The opening and closing of the gate 4 by lifting and lowering on the valve body 1 is common knowledge and will not be repeated here.

[0030] The buffer circular plate 7 is provided with at least two through holes 10 for allowing part of the water flow to pass through the buffer circular plate 7. A rotating column 11 is rotatably provided in the through hole 10 on the buffer circular plate 7. A buffer plate 12 is provided in the through hole 10 on the rotating column 11. One end of the buffer plate 12 is fixedly provided on the rotating column 11. A tension reset spring 13 is provided between the other end of the buffer plate 12 and the valve body 1. There are four through holes 10 in total. The four through holes 10 are equidistantly arranged in an annular manner on the buffer circular plate 7. A rotating column 11 and a buffer plate 12 are provided in each through hole 10. The number of tension reset springs 13 is the same as the number of through holes 10. A tension reset spring 13 is provided between each buffer circular plate 7 and the buffer plate 12. The tension reset spring 13 is located on the right side of the buffer circular plate 7. The tension reset spring 13 is obliquely arranged between the buffer plate 12 and the buffer circular plate 7.

[0031] A mounting plate 14 is provided on one end of the buffer circular plate 7 close to the buffer plate 12, and a transverse slide bar 15 is slidably provided on the mounting plate 14. The transverse slide bar 15 is transversely slidably provided on the mounting plate 14, and one end of the transverse slide bar 15 is close to the buffer plate 12, and the other end of the transverse slide bar 15 is away from the buffer plate 12. An elastic cover 16 is provided on the mounting plate 14 on the outside of the other end of the transverse slide bar 15, and an elastic connecting block 17 is provided between the elastic cover 16 and the mounting plate 14. The other end of the transverse slide bar 15 is located in the elastic cover 16, and a limit block 18 is provided on the other end of the transverse slide bar 15. The limit block 18 is used to prevent the transverse slide bar 15 from slipping off the mounting plate 14, and both end surfaces of the transverse slide bar 15 are arc-shaped surfaces. The number of mounting plates 14, transverse slide bars 15, and elastic covers 16 is the same as the number of through holes 10. The elastic cover 16 and the limiting block 18 can simultaneously limit the moving positions of both sides of the transverse slide bar 15 , thereby preventing the transverse slide bar 15 from slipping off the mounting plate 14 .

[0032] The elastic cover 16 is a rubber cover or a low-density polyethylene cover. The width of the connection end of the elastic cover 16 is greater than the width of the middle part of the elastic cover 16. Low-density polyethylene has good flexibility, extensibility, electrical insulation and certain air permeability. The width of the two connection ends of the elastic cover 16 is greater than the width of the middle part, which can make the middle part more elastically deformed when pushed by the other end of the transverse slide bar 15.

[0033] The elastic connection block 17 is a rubber spring block. The rubber spring is a type of spring that uses the elastic properties of rubber to provide rebound force. The rubber spring has a simple structure, a large deformation amount and a stable rebound force, a very fast rebound speed, and a longer service life than a metal spring.

[0034] The buffer plate 12 is an arc-shaped buffer plate. The through hole 10 is a convex hole, the front of the buffer plate 12 is a convex plate, and the buffer plate 12 is an arc-shaped plate when viewed from above. The convex setting can make the contact surface between the buffer plate 12 and the water flow larger, thereby improving the flipping effect of the buffer plate 12.

[0035] The left end surface of the buffer circular plate 7 is provided with a plurality of auxiliary grooves 19, which are arranged in an annular manner and equidistantly on the buffer circular plate 7. There are four auxiliary grooves 19 in total, which are arranged in an annular manner and equidistantly on the left side surface of the buffer circular plate 7. The outer circumference of the buffer circular plate 7 is provided with an inclined surface 20, and the valve body 1 is provided with at least three extrusion sliding holes 21 at equal intervals in an annular manner. The lower end of each extrusion sliding hole 21 is connected to the outlet end 3, and each extrusion sliding hole 21 is located at the end of the inclined surface 20. A contact block 22 is provided in each extrusion sliding hole 21 so as to be able to be raised and lowered. An extrusion spring 23 is provided between the upper end of the contact block 22 and the valve body 1, and the extrusion spring 23 is located in the extrusion sliding hole 21. An anti-slip member is provided between the contact block 22 and the valve body 1, and the circumference of the buffer circular plate 7 is located at the left end of the inclined surface 20 and is a plane. The lower end surface of the contact block 22 is an arc surface.

[0036] At least three auxiliary through holes 24 are equidistantly arranged in an annular manner on the valve body 1, the number of the auxiliary through holes 24 is the same as the number of the extrusion slide holes 21, and the positions of the auxiliary through holes 24 correspond to the positions of the extrusion slide holes 21, the lower ends of the auxiliary through holes 24 are communicated with the upper ends of the extrusion slide holes 21, a lifting plate 25 is provided in the extrusion slide hole 21 above the abutment block 22 and can be lifted and lowered, the extrusion spring 23 is arranged at the lower end of the lifting plate 25 and the upper end of the abutment block 22, the diameter of the auxiliary through hole 24 is smaller than the diameter of the extrusion slide hole 21, an adjusting screw 26 is connected by threads in the auxiliary through hole 24, the lower end of the adjusting screw 26 abuts against the upper end of the lifting plate 25, a placement annular groove 27 is arranged in an annular manner on the side end surface of the lifting plate 25, a sealing ring 28 is provided on the side end surface of the lifting plate 25 in the placement annular groove 27, and the outer peripheral side of the sealing ring 28 abuts against the inner wall of the extrusion slide hole 21. The adjusting screw 26 may be an external hexagonal bolt or an internal hexagonal bolt, or an extended handle may be provided on the head of the adjusting screw 26 for easy hand twisting.

[0037] At least three elastic sealing blocks 29 are equidistantly arranged in an annular manner on the valve body 1, the number of the elastic sealing blocks 29 is the same as the number of the extrusion sliding holes 21, the positions of the elastic sealing blocks 29 correspond to the positions of the extrusion sliding holes 21, and the auxiliary through holes 24 are formed on the elastic sealing blocks 29. The elastic sealing blocks 29 are fixedly arranged on the valve body 1, and are rubber blocks or nylon blocks.

[0038] The anti-slip member includes two anti-slip grooves 30 symmetrically provided on the valve body 1 and connected to the extrusion slide hole 21, and two anti-slip blocks 31 symmetrically provided on the side end surface of the abutment block 22 and having a clearance fit with the anti-slip grooves 30. The auxiliary through hole 24, the extrusion slide hole 21, the lifting plate 25, the abutment block 22, the anti-slip groove 30, and the anti-slip block 31 are all circular in shape.

[0039] The upper end of the adjusting screw 26 is symmetrically provided with two driving handles 32, and the two driving handles 32 are arranged on the upper end of the adjusting screw 26. The valve body 1 is provided with two positioning plates 38 on the left and right sides of the adjusting screw 26. The ends of the two driving handles 32 close to the positioning plates 38 are respectively provided with positioning grooves 33. The driving handles 32 are slidably provided with positioning balls 34 in the positioning grooves 33. The two positioning plates 38 are respectively provided with at least two positioning circular grooves 35. The two positioning circular grooves 35 are provided with at least two positioning circular grooves 35. The groove 35 is longitudinally arranged on the locking plate 38 and close to the end of the driving handle 32. A locking push spring 36 is arranged between the locking ball 34 and the driving handle 32. The locking push spring 36 is located in the locking slide groove 33. A limiting inner groove 37 is arranged on the driving handle 32 on the left side of the locking slide groove 33. The limiting inner groove 37 is used to prevent the locking ball 34 from escaping outward. An arc chamfer is arranged on the end of the driving handle 32 close to the locking plate 38. The arc chamfer is arranged on the front and rear sides of the driving handle 32.

[0040] The distance between a single locking plate 38 and the peripheral side of the adjusting screw 26 is greater than the distance between the driving handle 32 and the peripheral side of the adjusting screw 26. The diameter of the limiting inner groove 37 is smaller than the diameter of the locking slide groove 33. The limiting inner groove 37 can be set as an arc groove or a slope groove, as long as it can limit the locking ball 34 from slipping outward. The distance between the outermost sides of the two locking balls 34 is greater than the distance between the inner sides of the two locking plates 38, and the distance between the outermost sides of the two driving handles 32 is less than the distance between the inner sides of the two locking plates 38, so that the two driving handles 32 will not contact the inner sides of the two locking plates 38 when they move circumferentially.

[0041] The working principle of the present invention is as follows: when the control gate 4 is opened, the water flow contacts the surface of the buffer circular plate 7 to form a preliminary flow blocking effect, and pushes the buffer circular plate 7 to move rightward on the fixed rod 6. At this time, the compression buffer spring 8 slows down the force of the instantaneous rightward movement of the buffer circular plate 7, and part of the water flow contacting the surface of the buffer circular plate 7 flows into the through hole 10. The water flow pushes the buffer plate 12 to flip backward around the rotating column 11. When the buffer plate 12 flips backward, the reset spring 13 is stretched to produce elastic deformation, so that the buffer plate 12 buffers the water flow passing through the through hole 10. When the buffer plate 12 is instantly impacted by the water flow and flips backward to a predetermined position, the back of the buffer plate 12 contacts one end of the transverse slide bar 15, thereby pushing the transverse slide bar 15 to move toward the end of the elastic cover 16, and elastic deformation is generated by the elastic cover 16 and the elastic connecting block 17, thereby buffering the impact of the transverse slide bar 15, and assisting in buffering the buffer plate 12 when the water flow instantly impacts the buffer plate 12 and flips backward. The impact of the water flow is buffered by setting multiple structures, which can reduce the pressure fluctuation in the pipeline and reduce the phenomenon of water hammer effect in the valve; When the gate plate 4 is closed, the water flow no longer pushes the buffer circular plate 7 to move to the right, and the compression buffer spring 8 releases elastic potential energy to push the buffer circular plate 7 to move to the left on the fixed rod 6, and prevents the buffer circular plate 7 from slipping to the left on the fixed rod 6 through the anti-slip plate 9, and stretches the reset spring 13 to release elastic potential energy to pull the buffer plate 12 to flip forward around the rotating column 11, so that the buffer plate 12 is reset and the through hole 10 is in a semi-shielded state, so as to prepare for the subsequent buffering of the water flow; after the buffer plate 12 is reset, the elastic cover 16 and the elastic connecting block 17 are no longer pushed by the transverse slide bar 15, so as to release elastic potential energy to push the transverse slide bar 15 to reset, and prevent the transverse slide bar 15 from slipping off the mounting plate 14 through the limit block 18; When it is necessary to adjust the squeezing force of the abutment block 22 on the inclined surface 20 according to the flow rate, the adjusting screw 26 is moved downward or upward in the auxiliary through-hole 24 by screwing it forward or reversely. When the adjusting screw 26 moves downward, the adjusting screw 26 abuts against the upper end of the lifting plate 25 and moves downward, thereby pushing the lifting plate 25 to move toward the end of the squeezing spring 23, so that the squeezing spring 23 is gradually compressed to increase the driving force on the abutment block 22; when the adjusting screw 26 moves upward, the squeezing spring 23 gradually releases its elastic potential energy to push the lifting plate 25 to abut against the lower end of the adjusting screw 26, so that the lifting plate 25 moves upward with the adjusting screw 26, thereby reducing the driving force of the squeezing spring 23 on the abutment block 22; When the adjusting screw 26 needs to be rotated forward or reversely, the two driving handles 32 are twisted circumferentially by hand to drive the adjusting screw 26 to rotate. When the adjusting screw 26 rotates circumferentially, the two driving handles 32 move circumferentially in the two locking plates 38. When the locking ball 34 contacts the locking plate 38, the locking ball 34 moves inward in the locking groove 33 and squeezes the locking push spring 36. When the locking ball 34 is out of contact with the locking plate 38, the locking push spring 36 pushes the locking ball 34 out and prevents the locking ball 34 from being outwardly disengaged through the limiting inner groove 37. As the adjusting screw 26 rotates, the two driving handles 32 will be driven to move downward or upward on the valve body 1, and two locking circular grooves 35 are longitudinally arranged on each locking plate 38. When the positions of the locking ball 34 and the locking circular groove 35 correspond, the locking push spring 36 pushes the locking ball 34 out to engage with the locking circular groove 35. At this time, there is a certain resistance to the rotation of the adjusting screw 26, and the position prompt can be given to the operator.

[0042] The invention is intended to protect the structure of the product. The model of each component is not the content of the invention, and it is also a known technology. Any component on the market that can achieve the above functions of the invention can be selected and applied as a gate valve with a buffer function. Therefore, the model and other parameters of the component are not described in detail in the invention. The contribution of the invention lies in the scientific combination of the components.

[0043] The above shows and describes the basic principles and main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents. Anything not described in detail in the present invention is a well-known technology of those skilled in the art.

Claims

1. A gate valve with a buffering function, comprising a valve body, an inlet end and an outlet end arranged on the valve body, and a gate plate which can be raised and lowered and arranged on the valve body between the inlet end and the outlet end, characterized in that: It also includes a fixed circular plate fixedly arranged on the valve body and located inside the outlet end, a fixed rod arranged on the left end surface of the fixed circular plate, a buffer circular plate slidably arranged on the fixed rod and used to be pushed by the water flow to slide to the right on the fixed rod when the gate is opened, and a compression buffer spring arranged between the left end surface of the fixed circular plate and the right end surface of the buffer circular plate, the compression buffer spring is used to buffer the impact of the water flow when the buffer circular plate slides to the right on the fixed rod, and push the buffer circular plate to slide to the left on the fixed rod when the gate is closed, and the left end of the fixed rod is located on the left side of the buffer circular plate and is provided with an anti-slip plate, the anti-slip plate is used to prevent the buffer circular plate from slipping to the left on the fixed rod; The buffer circular plate is provided with at least two through holes for allowing part of the water flow to pass through the buffer circular plate, a rotating column is rotatably provided on the buffer circular plate in the through hole, a buffer plate is provided on the rotating column in the through hole, one end of the buffer plate is fixedly provided on the rotating column, and a tension reset spring is provided between the other end of the buffer plate and the valve body; The buffer circular plate is provided with a mounting plate at one end close to the buffer plate, and a transverse sliding bar is slidably provided on the mounting plate, and the transverse sliding bar is transversely slidably arranged on the mounting plate, one end of the transverse sliding bar is close to the buffer plate, and the other end of the transverse sliding bar is away from the buffer plate. An elastic cover is provided on the mounting plate on the outside of the other end of the transverse sliding bar, and an elastic connecting block is provided between the elastic cover and the mounting plate. The other end of the transverse sliding bar is located in the elastic cover, and a limiting block is provided at the other end of the transverse sliding bar, and the limiting block is used to prevent the transverse sliding bar from slipping off the mounting plate, and both end surfaces of the transverse sliding bar are arc surfaces.

2. The gate valve with buffer function according to claim 1, characterized in that: The elastic cover is a rubber cover or a low-density polyethylene cover.

3. The gate valve with buffer function according to claim 1, characterized in that: The elastic connecting block is a rubber spring block.

4. The gate valve with buffer function according to claim 1, characterized in that: The buffer plate is an arc-shaped buffer plate.

5. The gate valve with buffer function according to claim 1, characterized in that: The left end surface of the buffer circular plate is provided with a plurality of auxiliary grooves, and the plurality of auxiliary grooves are annularly arranged at equal intervals on the buffer circular plate.

6. The gate valve with buffer function according to claim 1, characterized in that: An inclined surface is arranged on the outer peripheral side of the buffer circular plate, at least three extrusion sliding holes are equidistantly arranged in an annular shape on the valve body, the lower end of each extrusion sliding hole is connected with the outlet end, each extrusion sliding hole is located at the end of the inclined surface, and an abutment block is arranged in each extrusion sliding hole so as to be liftable, an extrusion spring is arranged between the upper end of the abutment block and the valve body, the extrusion spring is located in the extrusion sliding hole, an anti-slip part is arranged between the abutment block and the valve body, and the peripheral side of the buffer circular plate is located at the left end of the inclined surface and is a plane.

7. The gate valve with buffer function according to claim 6, characterized in that: At least three auxiliary through holes are equidistantly arranged in an annular manner on the valve body, the number of the auxiliary through holes is the same as the number of the extrusion sliding holes, and the positions of the auxiliary through holes correspond to the positions of the extrusion sliding holes. The lower ends of the auxiliary through holes are communicated with the upper ends of the extrusion sliding holes, and a lifting plate is provided in the extrusion sliding hole above the abutment block and can be lifted and lowered. The extrusion spring is provided at the lower end of the lifting plate and the upper end of the abutment block. The diameter of the auxiliary through hole is smaller than the diameter of the extrusion sliding hole, and an adjusting screw is connected to the inner thread of the auxiliary through hole, and the lower end of the adjusting screw abuts against the upper end of the lifting plate. A placement ring groove is arranged in an annular manner on the side end surface of the lifting plate, and a sealing ring is provided in the placement ring groove on the side end surface of the lifting plate, and the outer peripheral side of the sealing ring abuts against the inner wall of the extrusion sliding hole.

8. The gate valve with buffer function according to claim 7, characterized in that: At least three elastic sealing blocks are equidistantly arranged in an annular manner on the valve body, the number of the elastic sealing blocks is the same as the number of the extrusion sliding holes, the position of each elastic sealing block corresponds to that of each extrusion sliding hole, and the auxiliary perforations are opened on the elastic sealing blocks.

9. The gate valve with buffer function according to claim 6, characterized in that: The anti-slip component comprises two anti-slip grooves symmetrically arranged on the valve body and connected with the extrusion sliding hole, and two anti-slip blocks symmetrically arranged on the side end surface of the abutment block and loosely matched with the anti-slip grooves.

10. The gate valve with buffer function according to claim 7, characterized in that: Two driving handles are symmetrically arranged on the upper end of the adjusting screw, and the two driving handles are arranged on the circumferential side of the upper end of the adjusting screw. Two locking plates are located on the valve body on the left and right sides of the adjusting screw. The ends of the two driving handles close to the locking plates are respectively provided with locking grooves, and the driving handles are slidably provided with locking balls in the locking grooves. At least two locking circular grooves are respectively arranged on the two locking plates, and the two locking circular grooves are longitudinally arranged on the locking plates and close to the end of the driving handle. A locking push spring is arranged between the locking ball and the driving handle, and the locking push spring is located in the locking groove. A limited inner groove is arranged on the driving handle on the left side of the locking groove, and the limited inner groove is used to prevent the locking ball from detaching outwardly. An arc chamfer is arranged on the end of the driving handle close to the locking plate, and the arc chamfer is arranged on the front and rear sides of the driving handle.

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