A seal-replaceable flat gate valve

Abstract

The present invention discloses a seal replaceable flat gate valve, which relates to the field of gas monitoring technology, and comprises a valve seat, a control mechanism, and a sealing component. The control mechanism comprises a supporting cylinder and a gate plate, a screw is installed inside the supporting cylinder, a driver is installed on the outer surface of the supporting cylinder and near the screw, a liquid flow channel is opened on the outer side of the gate plate and near the bottom, a strip track groove is opened on the side of the outer side of the gate plate, and the sealing component comprises a rectangular sealing ring, a semicircular cover is fixedly installed on the inner side of the rectangular sealing ring and near the strip track groove, an elastic plate is fixedly installed on the edge of the outer side of the semicircular cover, a ball is rollingly installed on the inner side of the semicircular cover and near the arc surface of the outer side of the elastic plate, and an elastic support is fixedly installed in the inner cavity of the rectangular sealing ring. The seal replaceable flat gate valve achieves the effect of anti-leakage, can be sealed, is not prone to leakage, and provides protection, and is convenient, safe and reliable to use.

Description

Technical Field

[0001] The invention relates to the technical field of flat gate valves, in particular to a seal-replaceable flat gate valve. Background Art

[0002] The flat gate valve is a sliding valve with parallel gates as the closing part. The closing part can be a single gate or a double gate with a spreading mechanism between them. 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. If it is a double-disc flat gate valve, the spreading mechanism between the two gates can supplement this pressing force.

[0003] According to the driving mode, the flat gate valve can be divided into manual flat gate valve, pneumatic flat gate valve and electric flat gate valve. According to the purpose and application, 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.

[0004] At present, when the existing flat gate valve is in use, as the gate is opened and closed, a water hammer effect will occur, causing the gate to be affected by sudden changes in the fluid, which will produce a large impact force, easily causing mutual impact between structures and reducing the service life of the equipment. Summary of the invention

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a seal replaceable flat gate valve, comprising:

[0006] A valve seat, a liquid inlet is installed on the outer side of the valve seat and near the top, a liquid outlet is installed on the side of the valve seat away from the liquid inlet, and a top cover is fixedly installed on the top of the valve seat by bolts;

[0007] A control mechanism, which is used to control the flow of the liquid, and the control mechanism is installed in the middle of the top cover;

[0008] Wherein, the control mechanism comprises a supporting cylinder and a gate plate, the bottom end of the supporting cylinder is fixedly installed at the middle of the top of the top cover, a screw is installed inside the supporting cylinder, a driver is installed on the outer circumferential surface of the supporting cylinder and near the screw, the top of the gate plate is rotatably installed with the bottom end of the screw, a liquid flow channel is opened on the outer side of the gate plate and near the bottom, and a strip track groove is opened on the side of the outer side of the gate plate. Under the support of the supporting cylinder, the gate plate is driven to move upward by the screw, so that the liquid flow channel can move upward, and as the liquid flow channel and the liquid inlet are at the same height, the liquid flows into the liquid flow channel from the position of the liquid inlet and is discharged from the liquid outlet;

[0009] When the driver drives the screw rod to rotate in the opposite direction, the gate plate can be moved downward, so that the position of the liquid flow channel and the liquid inlet are offset, and the valve can be closed to organize the liquid flow, thereby controlling the liquid flow;

[0010] A sealing assembly, which is used to fill the gap between the valve seat and the top cover, and the sealing assembly is installed between the top of the valve seat and the bottom of the top cover;

[0011] Wherein, the sealing assembly includes a rectangular sealing ring, which is hollow and installed between the top of the valve seat and the bottom of the top cover, the gate plate passes through the middle of the rectangular sealing ring, and a through hole is opened at the edge of the outer side of the rectangular sealing ring, a semicircular cover is fixedly installed on the inner side of the rectangular sealing ring and close to the position of the strip track groove, an elastic plate is fixedly installed on the edge of the outer side of the semicircular cover, and a ball is rollingly installed on the inner side of the semicircular cover and close to the arc surface of the outer side of the elastic plate, and an elastic support is fixedly installed in the inner cavity of the rectangular sealing ring, and the rectangular sealing ring is installed between the top cover and the valve seat, and the top cover and the valve seat are fixed by bolts, so that the rectangular sealing ring is squeezed, which can increase the contact area, and can fill the gap between the valve seat and the top cover, so as to achieve a sealing effect.

[0012] Preferably, the liquid inlet and the liquid outlet are installed at the same height, which facilitates the fluid to enter the valve and helps the fluid to be discharged. The strip track grooves are divided into two groups, and the two groups of strip track grooves are symmetrically opened along the liquid flow path.

[0013] Preferably, the driver is installed near the top of the supporting cylinder, and the axis in the middle of the screw rod coincides with the axis in the middle of the supporting cylinder, so that the supporting cylinder supports the screw rod, and the gate plate is installed directly below the screw rod, so that the screw rod drives the gate plate to move.

[0014] Preferably, the through holes are evenly distributed at the edge of the outer side of the rectangular sealing ring, and the materials of the rectangular sealing ring and the elastic support member are both made of rubber. The elastic support member is installed inside the rectangular sealing ring so that the elastic support member is squeezed and deformed, thereby supporting the inside of the rectangular sealing ring. By combining the action force and reaction force, the rectangular sealing ring is subjected to a reverse force, thereby causing the rectangular sealing ring to fully fit with the top cover and the valve seat.

[0015] Preferably, the position of the ball corresponds to the position of the strip track groove, the elastic plate is arc-shaped, there are two elastic plates, and the two elastic plates are symmetrically installed along the gate plate, and are installed between the valve seat and the top cover using a rectangular sealing ring, and the gate plate passes through the middle of the rectangular sealing ring and passes through the through hole with bolts, so that the rectangular sealing ring is not easy to slip.

[0016] When the rectangular sealing ring needs to be replaced, it is only necessary to loosen the bolts, pull the bolts out of the through holes, and remove the top cover, and the rectangular sealing ring can be replaced, making replacement convenient and more flexible to use.

[0017] When the top cover is installed on the top of the valve seat, the elastic plate can be pressed so that the elastic plate is compressed and deformed, and the ball will be pushed to a position close to the strip track groove for fine adjustment. The ball can be embedded in the strip track groove, and the gate plate will be supported to reduce the shaking caused by the impact of the water hammer effect of the fluid. When the gate plate moves up and down, the ball can roll, so that the gate plate moves smoothly and is not prone to getting stuck. The interaction between the structures is used to connect the structures together.

[0018] Preferably, a liquid guide component is installed inside the liquid inlet and the liquid outlet, and the liquid guide component includes an annular connector, which is conical, and is fixedly installed at the side of the outer side of the annular connector and in the middle of the inner cavity of the liquid inlet, and a guide vane is fixedly installed at the edge of the outer side of the annular connector and close to the liquid flow channel, and an auxiliary module is installed on the outer side of the annular connector and close to the flange at the liquid inlet end of the liquid inlet. The guide vane is spiral, and the fluid will show a vortex under the guidance of the guide vane. When the fluid forms a vortex, the kinetic energy of the fluid will be converted into rotational energy to a certain extent, reducing the impact force of the fluid on the components and achieving a protective effect. At the same time, the spiral directions of the guide vanes in the liquid inlet and the guide vanes in the liquid outlet are consistent, so that the swirling flow of the fluid can be fully utilized to flush the tube wall, so that sticky impurities are not easily deposited on the tube wall.

[0019] Preferably, the guide vane is spiral-shaped to facilitate guiding the fluid so that the fluid swirls, and the axis at the center of the guide vane coincides with the axis at the center of the liquid inlet. The guide vane is installed at the center of the liquid inlet to promote liquid flow.

[0020] Preferably, the auxiliary module includes a first annular extension edge, the outer edge of the first annular extension edge is fixedly installed with the conical surface on the inner side of the annular connector, the first annular extension edge is installed at one end away from the guide vane, an annular sheet is fixedly installed at the outer side of the first annular extension edge and at a flange position close to the liquid inlet end of the liquid inlet, an annular hole is opened inside the annular sheet, a positioning hole is opened on the outer side of the annular sheet and at a position close to the edge, a second annular extension edge is fixedly installed on the side of the annular sheet away from the first annular extension edge, and the flange at the liquid inlet end and the flange at the liquid outlet end are connected to the pipeline, so that the annular sheet is in the middle;

[0021] When the gate moves downward to close the valve, liquid still remains in the liquid inlet, and under the pressure of the liquid, the interior of the first annular extension edge and the interior of the second annular extension edge are filled with liquid, so that under the action of the liquid pressure, the first annular extension edge and the second annular extension edge on both sides of the annular sheet are tightly fitted to the pipe wall to form a secondary blockade, thereby preventing leakage.

[0022] Preferably, the first annular extension edge is installed inside the liquid inlet, and the first annular extension edge, the annular sheet and the second annular extension edge are concentric circles.

[0023] Preferably, the material of the first annular extension edge, the material of the annular sheet and the material of the second annular extension edge are all made of rubber, which is convenient for sealing the liquid. The positioning holes are evenly distributed on the outside of the annular sheet and close to the edge, which is convenient for positioning the annular sheet when it is connected and installed with the liquid inlet and outlet using an external pipeline.

[0024] The present invention provides a flat gate valve with a seal that can be easily replaced. It has the following beneficial effects:

[0025] 1. The seal is replaceable flat gate valve. The rotation of the screw rod can drive the gate plate to move upward, so that the liquid flow channel can move upward. As the liquid flow channel and the liquid inlet are at the same height, the liquid flows into the liquid flow channel from the liquid inlet and is discharged from the liquid outlet. When the driver drives the screw rod to rotate in the opposite direction, the gate plate can be moved downward, so that the position of the liquid flow channel and the liquid inlet is staggered, and the valve can be closed to organize the liquid fluid, thereby controlling the liquid flow.

[0026] 2. The seal is a replaceable flat gate valve, which uses a rectangular sealing ring to be installed between the top cover and the valve seat, and the top cover and the valve seat are fixed with bolts, so that the rectangular sealing ring is squeezed to increase the contact area, thereby filling the gap between the valve seat and the top cover and achieving a sealing effect.

[0027] 3. The seal is replaceable flat gate valve, and the elastic support is installed inside the rectangular sealing ring, so that the elastic support will be squeezed and deformed, so as to support the inside of the rectangular sealing ring, and combine the action force and reaction force to make the rectangular sealing ring subject to the reverse force, so as to make the rectangular sealing ring fit fully with the top cover and the valve seat.

[0028] Fourth, the seal is replaceable flat gate valve, which is installed between the valve seat and the top cover using a rectangular sealing ring, and the gate passes through the middle of the rectangular sealing ring and is bolted through the through hole, so that the rectangular sealing ring is not easy to slip.

[0029] 5. The seal is replaceable flat gate valve. When the rectangular seal ring needs to be replaced, you only need to loosen the bolts, pull the bolts out from the through holes, and remove the top cover to replace the rectangular seal ring, making replacement convenient and more flexible to use.

[0030] 6. The seal is a replaceable flat gate valve. The elastic plate is pressed so that it is compressed and deformed. The ball will be pushed to a position close to the strip track groove for fine adjustment. The ball can be embedded in the strip track groove, and the gate will be supported to reduce the shaking caused by the impact of the water hammer effect of the fluid. When the gate moves up and down, the ball can roll, so that the gate moves smoothly and is not prone to getting stuck.

[0031] 7. The seal is replaceable flat gate valve, and the guide vane is spiral. Under the guidance of the guide vane, the fluid will present a swirl. When the fluid forms a swirl, the kinetic energy of the fluid will be converted into rotational energy to a certain extent, reducing the impact of the fluid on the components and playing a protective role. At the same time, the guide vane in the liquid inlet and the guide vane in the liquid outlet have the same spiral direction, so the swirl of the fluid can be fully utilized to flush the pipe wall, making it difficult for sticky impurities to deposit on the pipe wall.

[0032] 8. The seal is a replaceable flat gate valve. When the gate moves downward to close the valve, liquid still remains in the liquid inlet, and under the pressure of the liquid, the interior of the first annular extension edge and the interior of the second annular extension edge are filled with liquid, so that both sides of the annular sheet are in close contact with the pipe wall under the action of the liquid pressure, forming a secondary blockade, so as to prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall structure of the replaceable seal flat gate valve of the present invention;

[0034] Figure 2 This is a schematic diagram of the disassembled structure of the replaceable seal flat gate valve of the present invention;

[0035] Figure 3 It is a schematic diagram of the connection structure between the control mechanism and the top cover of the present invention;

[0036] Figure 4 It is a schematic diagram of the overall structure of the control mechanism of the present invention;

[0037] Figure 5 It is a schematic diagram of the connection structure between the sealing assembly and the gate plate of the present invention;

[0038] Figure 6 This is a schematic diagram of the overall structure of the sealing assembly of the present invention;

[0039] Figure 7It is a schematic diagram of the cross-sectional structure of the sealing assembly of the present invention;

[0040] Figure 8 It is a schematic diagram of the connection structure between the liquid guide component and the liquid inlet of the present invention;

[0041] Fig. 9 It is a schematic diagram of the overall structure of the liquid guide component of the present invention.

[0042] In the figure: 1. valve seat; 2. liquid inlet; 3. liquid outlet; 4. top cover; 5. control mechanism; 6. sealing assembly; 7. liquid guide assembly; 51. supporting cylinder; 52. screw rod; 53. driver; 54. gate; 55. liquid flow channel; 56. strip track groove; 61. rectangular sealing ring; 62. through hole; 63. semicircular cover; 64. elastic plate; 65. ball; 66. elastic support member; 71. annular connector; 72. auxiliary module; 73. guide vane; 721. first annular extension edge; 722. annular sheet; 723. annular hole; 724. positioning hole; 725. second annular extension edge. DETAILED DESCRIPTION

[0043] 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.

[0044] The first embodiment, as Figure 1-Figure 4 As shown, the present invention provides a technical solution: a seal replaceable flat gate valve, comprising:

[0045] A valve seat 1, a liquid inlet 2 is installed on the outer side of the valve seat 1 and near the top, a liquid outlet 3 is installed on the side of the valve seat 1 away from the liquid inlet 2, and a top cover 4 is fixed on the top of the valve seat 1 by bolts;

[0046] A control mechanism 5, which is used to control the flow of the liquid and is installed in the middle of the top cover 4;

[0047] The control mechanism 5 includes a supporting cylinder 51 and a gate 54. The bottom end of the supporting cylinder 51 is fixedly installed at the middle of the top of the top cover 4. A screw 52 is installed inside the supporting cylinder 51. A driver 53 is installed on the outer surface of the supporting cylinder 51 and near the screw 52. The top of the gate 54 is rotatably installed with the bottom end of the screw 52. A liquid flow channel 55 is opened on the outer side of the gate 54 and near the bottom. A strip track groove 56 is opened on the side of the outer side of the gate 54. The staff controls the screw 52 through the driver 53, and under the support of the supporting cylinder 51, the screw 52 drives the gate 54 to move upward, so that the liquid flow channel 55 can move upward. As the liquid flow channel 55 is at the same height as the liquid inlet 2, the liquid flows into the liquid flow channel 55 from the position of the liquid inlet 2 and is discharged from the liquid outlet 3.

[0048] When the driver 53 drives the screw rod 52 to rotate in the opposite direction, the gate plate 54 can be moved downward, so that the position of the liquid flow channel 55 and the liquid inlet 2 are offset, and the valve can be closed.

[0049] The liquid inlet 2 and the liquid outlet 3 are installed at the same height, which is convenient for the fluid to enter the valve and helps the fluid to be discharged. There are two groups of strip track grooves 56, and the two groups of strip track grooves 56 are symmetrically opened along the liquid flow channel 55.

[0050] The driver 53 is installed near the top of the support cylinder 51, and the axis of the middle of the screw rod 52 coincides with the axis of the middle of the support cylinder 51, so that the support cylinder 51 can support the screw rod 52. The gate plate 54 is installed directly below the screw rod 52, so that the screw rod 52 can drive the gate plate 54 to move.

[0051] The second embodiment, as Figure 1-Figure 7 As shown, based on the first embodiment:

[0052] A sealing component 6, which is used to fill the gap between the valve seat 1 and the top cover 4, and the sealing component 6 is installed between the top of the valve seat 1 and the bottom of the top cover 4;

[0053] Among them, the sealing component 6 includes a rectangular sealing ring 61, which is hollow and installed between the top of the valve seat 1 and the bottom of the top cover 4. The gate plate 54 passes through the middle of the rectangular sealing ring 61. A through hole 62 is opened at the edge of the outer side of the rectangular sealing ring 61. A semicircular cover 63 is fixedly installed on the inner side of the rectangular sealing ring 61 and close to the position of the strip track groove 56. An elastic plate 64 is fixedly installed on the edge of the outer side of the semicircular cover 63. A ball 65 is rollingly installed on the inner side of the semicircular cover 63 and close to the arc surface of the outer side of the elastic plate 64. An elastic support member 66 is fixedly installed in the inner cavity of the rectangular sealing ring 61. The rectangular sealing ring 61 is installed between the top cover 4 and the valve seat 1, and the top cover 4 and the valve seat 1 are fixed by bolts, so that the rectangular sealing ring 61 is squeezed, which can increase the contact area and fill the gap between the valve seat 1 and the top cover 4.

[0054] The through holes 62 are evenly distributed at the edge of the outer side of the rectangular sealing ring 61. The materials of the rectangular sealing ring 61 and the elastic support member 66 are both made of rubber. The elastic support member 66 is installed inside the rectangular sealing ring 61 so that the elastic support member 66 is squeezed and deformed, thereby supporting the inside of the rectangular sealing ring 61. By combining the action force and reaction force, the rectangular sealing ring 61 is subjected to a reverse action force, thereby causing the rectangular sealing ring 61 to fully fit with the top cover 4 and the valve seat 1.

[0055] The position of the ball 65 corresponds to the position of the strip track groove 56, the elastic plate 64 is arc-shaped, there are two elastic plates 64, and the two elastic plates 64 are symmetrically installed along the gate plate 54, and are installed between the valve seat 1 and the top cover 4 using a rectangular sealing ring 61, and the gate plate 54 passes through the middle of the rectangular sealing ring 61 and passes through the through hole 62 through a bolt, so that the rectangular sealing ring 61 is not easy to slip.

[0056] When the rectangular sealing ring 61 needs to be replaced, it is only necessary to loosen the bolts, pull the bolts out of the through holes 62, and remove the top cover 4, so that the rectangular sealing ring 61 can be replaced, making replacement convenient.

[0057] When the top cover 4 is installed on the top of the valve seat 1, the elastic plate 64 can be pressed so that the elastic plate 64 is compressed and deformed, and the ball 65 will be pushed to a position close to the strip track groove 56 for fine adjustment, and the ball 65 can be embedded in the strip track groove 56. The gate plate 54 will be supported to reduce the shaking caused by the impact of the water hammer effect of the fluid, and when the gate plate 54 moves up and down, the ball 65 can roll, so that the gate plate 54 moves smoothly and is not easy to get stuck.

[0058] The third embodiment, as Figure 1-Figure 4 and Figure 8-Figure 9 As shown, based on the first embodiment:

[0059] A liquid guide assembly 7 is installed inside the liquid inlet 2 and inside the liquid outlet 3. The liquid guide assembly 7 includes an annular connector 71. The annular connector 71 is conical. The side of the outer side of the annular connector 71 is fixedly installed at the middle of the inner cavity of the liquid inlet 2. A guide vane 73 is fixedly installed at the edge of the outer side of the annular connector 71 and close to the liquid flow channel 55. An auxiliary module 72 is installed at the outer side of the annular connector 71 and close to the flange of the liquid inlet end of the liquid inlet 2. When the fluid enters from the position of the liquid inlet 2, the guide vane 73 is spiral, and the fluid will present a swirl under the guidance of the guide vane 73. When the fluid forms a swirl, the kinetic energy of the fluid will be converted into rotational energy to a certain extent, reducing the impact force of the fluid on the components, thereby achieving a protective effect.

[0060] At the same time, by using the same spiral direction of the guide vane 73 in the liquid inlet 2 and the guide vane 73 in the liquid outlet 3, the swirling flow of the fluid can be fully utilized to flush the tube wall, making it difficult for sticky impurities to accumulate on the tube wall.

[0061] The guide vane 73 is spiral-shaped to facilitate guiding the fluid so that the fluid swirls, and the axis at the center of the guide vane 73 coincides with the axis at the center of the liquid inlet 2. The guide vane 73 is installed at the center of the liquid inlet 2 to promote liquid flow.

[0062] The auxiliary module 72 includes a first annular extension edge 721, the outer edge of the first annular extension edge 721 is fixedly installed at the conical surface inside the annular connector 71, the first annular extension edge 721 is installed at one end away from the guide blade 73, an annular sheet 722 is fixedly installed at the side of the outer side of the first annular extension edge 721 and at the flange position close to the liquid inlet end of the liquid inlet 2, an annular hole 723 is opened inside the annular sheet 722, a positioning hole 724 is opened on the outer side of the annular sheet 722 and close to the edge, and the annular sheet 722 is fixedly installed on the side away from the first annular extension edge 721. A second annular extension edge 725 is provided, and the flange at the end of the liquid inlet 2 and the flange at the end of the liquid outlet 3 are used to connect with the pipeline, so that the annular sheet 722 is in the middle. When the gate plate 54 moves downward to close the valve, liquid still remains in the liquid inlet 2, and under the action of the liquid pressure, the interior of the first annular extension edge 721 and the interior of the second annular extension edge 725 are filled with liquid, so that under the action of the liquid pressure, both sides of the annular sheet 722 are tightly fitted with the pipe wall by the first annular extension edge 721 and the second annular extension edge 725, forming a secondary blockade, so as to prevent leakage.

[0063] The first annular extension edge 721 is installed inside the liquid inlet 2 , and the first annular extension edge 721 , the annular sheet 722 and the second annular extension edge 725 are concentric circles.

[0064] The materials of the first annular extension edge 721, the annular sheet 722 and the second annular extension edge 725 are all made of rubber, which is convenient for sealing the liquid. The positioning holes 724 are evenly distributed on the outside of the annular sheet 722 and close to the edge, which is convenient for positioning the annular sheet 722 when it is connected and installed with the liquid inlet 2 and the liquid outlet 3 using an external pipeline.

[0065] When in use, first install the sealing assembly 6 as a whole between the top cover 4 and the valve seat 1, and install the top cover 4 and the control mechanism 5 as a whole on the top of the valve seat 1, and fix the top cover 4 and the valve seat 1 with bolts, so that the rectangular sealing ring 61 is squeezed to increase the contact area, so as to fill the gap between the valve seat 1 and the top cover 4;

[0066] A rectangular sealing ring 61 is installed between the valve seat 1 and the top cover 4, and the gate plate 54 passes through the middle of the rectangular sealing ring 61 and passes through the through hole 62 through bolts, so that the rectangular sealing ring 61 is not easy to slip;

[0067] At the same time, the elastic support member 66 is installed inside the rectangular sealing ring 61, so that the elastic support member 66 is squeezed and deformed, so as to support the inside of the rectangular sealing ring 61, and the rectangular sealing ring 61 is subjected to a reverse force by combining the action force and the reaction force, so as to make the rectangular sealing ring 61 fully fit with the top cover 4 and the valve seat 1;

[0068] When the top cover 4 is installed on the top of the valve seat 1, the elastic plate 64 can be pressed, so that the elastic plate 64 is compressed and deformed, and the ball 65 is pushed to a position close to the strip track groove 56 for fine adjustment, so that the ball 65 can be embedded in the strip track groove 56, and the gate plate 54 can be supported, which can reduce the shaking caused by the impact of the fluid water hammer effect;

[0069] At this time, the valve as a whole is connected to the flange at the end of the external pipeline through the flange at the end of the liquid inlet 2 and the flange at the end of the liquid outlet 3, so that the annular piece 722 is in the middle;

[0070] The staff controls the screw rod 52 through the driver 53, and under the support of the support cylinder 51, the screw rod 52 drives the gate plate 54 to move upward, so that the liquid flow channel 55 can move upward. As the liquid flow channel 55 and the liquid inlet 2 are at the same height, the liquid fluid flows. The guide vane 73 is spiral, and the fluid will present a swirl under the guidance of the guide vane 73. When the fluid forms a swirl, the kinetic energy of the fluid will be converted into rotational energy to a certain extent, reducing the impact force of the fluid on the components. At this time, the liquid flows into the liquid flow channel 55 from the position of the liquid inlet 2 and is discharged from the liquid outlet 3;

[0071] When the driver 53 drives the screw rod 52 to rotate in the opposite direction, the gate plate 54 can be moved downward, so that the position of the liquid flow channel 55 and the liquid inlet 2 are offset, and the valve can be closed;

[0072] When the top cover 4 is installed on the top of the valve seat 1, the elastic plate 64 can be pressed, so that the elastic plate 64 is compressed and deformed, and the ball 65 is pushed to a position close to the strip track groove 56 for fine adjustment, so that the ball 65 can be embedded in the strip track groove 56, and the gate plate 54 can be supported, which can reduce the shaking caused by the impact of the fluid water hammer effect, and when the gate plate 54 moves up and down, the ball 65 can roll, so that the gate plate 54 moves smoothly and is not easy to get stuck;

[0073] Moreover, when the gate plate 54 moves downward to close the valve, liquid still remains in the liquid inlet 2, and under the action of the liquid pressure, the interior of the first annular extension edge 721 and the interior of the second annular extension edge 725 are filled with liquid, so that under the action of the liquid pressure, the first annular extension edge 721 and the second annular extension edge 725 on both sides of the annular sheet 722 are tightly fitted to the pipe wall to form a secondary blockade, thereby preventing leakage.

[0074] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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 fall within 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 the conventional means in the field unless otherwise specified and limited.

Claims

1. A seal-replaceable flat gate valve, characterized in that: include: A valve seat (1), wherein a liquid inlet (2) is installed on the outer side of the valve seat (1) and near the top, a liquid outlet (3) is installed on the side of the valve seat (1) away from the liquid inlet (2), and a top cover (4) is fixedly installed on the top of the valve seat (1) by bolts; A control mechanism (5), the control mechanism (5) being used to control the flow of the liquid, the control mechanism (5) being installed in the middle of the top cover (4); The control mechanism (5) comprises a supporting cylinder (51) and a gate plate (54); the bottom end of the supporting cylinder (51) is fixedly mounted to the middle of the top of the top cover (4); a screw rod (52) is mounted inside the supporting cylinder (51); a driver (53) is mounted on the outer circumferential surface of the supporting cylinder (51) and close to the screw rod (52); the top of the gate plate (54) is rotatably mounted to the bottom end of the screw rod (52); a liquid flow channel (55) is provided on the outer side of the gate plate (54) and close to the bottom; and a strip track groove (56) is provided on the side of the outer side of the gate plate (54); A sealing component (6), the sealing component (6) being used to fill the gap between the valve seat (1) and the top cover (4), the sealing component (6) being installed between the top of the valve seat (1) and the bottom of the top cover (4); The sealing assembly (6) comprises a rectangular sealing ring (61), the rectangular sealing ring (61) is hollow, and the rectangular sealing ring (61) is installed between the top of the valve seat (1) and the bottom of the top cover (4), the gate plate (54) passes through the middle of the rectangular sealing ring (61), a through hole (62) is provided at the outer edge of the rectangular sealing ring (61), a semicircular cover (63) is fixedly installed on the inner side of the rectangular sealing ring (61) and close to the strip track groove (56), an elastic plate (64) is fixedly installed on the outer edge of the semicircular cover (63), a ball (65) is rollingly installed on the inner side of the semicircular cover (63) and close to the outer arc surface of the elastic plate (64), and an elastic support member (66) is fixedly installed in the inner cavity of the rectangular sealing ring (61); The liquid inlet (2) and the liquid outlet (3) are installed at the same height, the strip track grooves (56) are in two groups, and the two groups of strip track grooves (56) are symmetrically opened along the liquid flow channel (55); The driver (53) is installed at a position close to the top of the supporting cylinder (51), the axis of the middle of the screw rod (52) coincides with the axis of the middle of the supporting cylinder (51), and the gate plate (54) is installed directly below the screw rod (52); The through holes (62) are evenly distributed at the outer edge of the rectangular sealing ring (61), and the material of the rectangular sealing ring (61) and the material of the elastic support member (66) are both rubber materials; The position of the ball (65) corresponds to the position of the strip track groove (56); the elastic plate (64) is arc-shaped; there are two elastic plates (64), and the two elastic plates (64) are symmetrically installed along the gate plate (54); A liquid guide assembly (7) is installed inside the liquid inlet (2) and inside the liquid outlet (3), the liquid guide assembly (7) comprising an annular connector (71), the annular connector (71) being conical, the outer side of the annular connector (71) being fixedly installed at the middle of the inner cavity of the liquid inlet (2), a guide vane (73) being fixedly installed at the outer edge of the annular connector (71) and close to the liquid flow channel (55), and an auxiliary module (72) being installed at the outer side of the annular connector (71) and close to the flange of the liquid inlet end of the liquid inlet (2); The guide blade (73) is spiral-shaped, and the axis at the center of the guide blade (73) coincides with the axis at the center of the liquid inlet (2); The auxiliary module (72) comprises a first annular extension edge (721), the outer edge of the first annular extension edge (721) is fixedly mounted to the conical surface on the inner side of the annular connector (71), the first annular extension edge (721) is mounted at an end away from the guide vane (73), an annular sheet (722) is fixedly mounted at the outer side of the first annular extension edge (721) and at a flange position close to the liquid inlet end of the liquid inlet (2), an annular hole (723) is provided inside the annular sheet (722), a positioning hole (724) is provided on the outer side of the annular sheet (722) and at a position close to the edge, and a second annular extension edge (725) is fixedly mounted on a side of the annular sheet (722) away from the first annular extension edge (721); The first annular extension edge (721) is installed inside the liquid inlet (2), and the first annular extension edge (721), the annular sheet (722) and the second annular extension edge (725) are concentric circles.

2. A seal-replaceable flat gate valve according to claim 1, characterized in that: The material of the first annular extension edge (721), the material of the annular sheet (722) and the material of the second annular extension edge (725) are all made of rubber, and the positioning holes (724) are evenly distributed on the outside of the annular sheet (722) and close to the edge.

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