Flat gate valve

Abstract

The invention discloses a flat gate valve, and relates to the technical field of gate valves, in particular to a flat gate valve which comprises a gate valve body, the gate valve body comprises a valve body and a cover plate arranged on the upper surface of the valve body, and a gate plate capable of moving up and down and a graphite packing used for sealing the gate plate are arranged in the valve body. Through the arrangement of an extrusion plate, a drainage channel and a power part, leaked liquid can flow into a gathering cavity from the drainage channel corresponding to the leaked liquid when one position of the graphite packing leaks liquid, and when a gate plate moves up and down, an extrusion rod can be promoted to be inserted into the gathering cavity, so that the liquid collected in the gathering cavity is extruded, and the liquid in the gathering cavity can be collected. And finally, the extrusion plate can press the leakage point of the graphite packing, so that the graphite packing is promoted to expand towards the two sides to improve the sealing performance between the graphite packing and the gate plate, communicated small gaps and holes can be blocked, and therefore the service life of the graphite packing can be prolonged, and meanwhile the sealing performance between the graphite packing and the gate plate can be improved. And the part without the leakage point of the graphite packing cannot be extruded.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and more particularly to a 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 an opening 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. If it is a double-disc flat gate valve, the opening 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 occasion, it can be divided into knife gate valve, flat gate valve with diversion hole and flat gate valve without diversion hole.

[0004] Among them, knife gate valves were introduced into my country in the 1980s. In less than 20 years, their scope of use has expanded from general fields to a wider range of industries, from coal preparation, gangue and slag discharge in mines and power plants to urban sewage treatment, and from general industrial pipelines to professional pipeline systems such as food, health and medicine. Among them, the top of the knife gate valve disc and the valve body are mainly sealed by graphite packing.

[0005] The graphite packing is woven from graphite wire and has many excellent properties suitable for this sealing scenario. However, during the frequent movement of the gate of the knife gate valve, the continuous friction between the gate and the graphite packing will cause the surface of the graphite fiber to be subjected to shear force and friction force. Over time, these forces will cause the surface of the graphite fiber to gradually wear and the integrity of the fiber to be destroyed. The originally tightly arranged fiber structure becomes loose, and some fibers may even break, which reduces the overall structural strength of the graphite packing. At the same time, at the microscopic level, many tiny gaps and holes are formed on the contact surface between the graphite packing and the gate. The size and number of these microscopic gaps continue to increase with the increase of wear. When they are interconnected, they provide a channel for the leakage of the medium. However, when the graphite packing leaks, there is often a leak point. Therefore, in order to increase the service life of the graphite packing, personnel often increase the pressure on the graphite packing from top to bottom to encourage the graphite packing to continue to be used; For example, a knife gate valve with application number: 202411244935.4, which relates to the technical field of industrial valves, comprises a valve body, a gate, a control assembly, a sealing packing, a packing gland, a detection assembly and an adjustment assembly, wherein the control assembly is used to drive the gate to move and block the through cavity of the valve body, the detection assembly comprises a first detection frame, a detection needle, a second detection frame, a detection magnet and a detection telescopic rod, and the adjustment assembly comprises an adjustment telescopic rod, a connecting pipe, a baffle, a first adjustment magnet and a second adjustment magnet; Although the knife gate valve in the above patent has the effect of reducing leakage loss, improving sealing performance, and ensuring the normal operation of the pipeline system, when it pressurizes the graphite packing, it pressurizes the entire graphite packing. Although the leaking point can be re-sealed, other places without leakage will increase its wear. Because when all areas on the upper surface of the graphite packing are pressed from top to bottom, the graphite packing will expand to both sides when observed from the cross-section. This is because the graphite packing is a material with certain elasticity and plasticity. When it is subjected to vertical pressure, the distance between the molecules or particles inside it will be compressed and reduced. Since the material is incompressible, when it cannot continue to accommodate more materials in the vertical direction, it will seek space in the horizontal direction, resulting in expansion to both sides. Therefore, when the graphite packing in the above patent is subjected to pressure, the places without leakage will increase its wear. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a flat gate valve that solves the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a flat gate valve, comprising a gate valve body, wherein the gate valve body comprises a valve body and a cover plate arranged on the upper surface of the valve body, and a gate plate capable of moving up and down and a graphite packing for sealing the gate plate are arranged in the valve body, and an extrusion component having the same shape as the graphite packing is arranged on the upper surface of the graphite packing; The extrusion component includes a plurality of extrusion plates slidably connected in the valve body, and a leakage channel is penetrated on the side of the extrusion plate away from the gate plate, and a plurality of gathering cavities connected to the leakage channel and corresponding to each other are opened in the valve body, and the gathering cavities are used to collect the liquid flowing out of the leakage channel; The gate plate is evenly provided with a plurality of extrusion rods which can be plugged into the corresponding gathering cavities; A power component capable of receiving the thrust of the liquid in the gathering chamber is arranged directly above the squeezing plate, and the bottom end of the power component abuts against the squeezing plate.

[0008] Preferably, the valve body is also provided with a first connecting channel whose two ends are respectively connected to the bottom end of the gathering chamber and the middle part of the gathering chamber, and a second one-way valve is arranged at the bottom end of the first connecting channel. An auxiliary pressing block with one end inserted into the gathering chamber is arranged on the inner wall of the valve body near the top of the extrusion plate, and the interior of the auxiliary pressing block is a cavity. The end of the auxiliary pressing block inserted in the gathering chamber is connected to the top of the first connecting channel, and the top of the power component is fixedly connected to the end of the auxiliary pressing block near the gate plate, and the top of the power component passes through the lower surface of the auxiliary pressing block and extends into the auxiliary pressing block.

[0009] Preferably, the power component includes an auxiliary pressing cylinder fixedly connected to the lower surface of the auxiliary pressing block, the top end of the auxiliary pressing cylinder penetrates the lower surface of the auxiliary pressing block and extends into the auxiliary pressing block, there is a space for liquid to enter between the top end of the auxiliary pressing cylinder and the inner top surface of the auxiliary pressing block, the inner wall of the auxiliary pressing cylinder is slidably connected with an elastic pushing component, the bottom end of the elastic pushing component is fixedly connected with an auxiliary pushing component, and the bottom end of the auxiliary pushing component is in contact with the extrusion plate.

[0010] Preferably, the elastic pushing component includes an upper force-bearing plate slidably connected to the top of the inner wall of the auxiliary pressing cylinder and a lower output plate slidably connected to the bottom end of the inner wall of the auxiliary pressing cylinder, a first spring is arranged between the upper force-bearing plate and the lower output plate, a connecting rod is arranged on the lower surface of the lower output plate, the auxiliary pushing component is arranged at the bottom end of the connecting rod, and the lower surface of the auxiliary pushing component is in contact with the extrusion plate.

[0011] Preferably, the connecting rod includes an upper pressing plate fixedly connected to the lower surface of the lower output plate, the upper surface of the auxiliary pushing component is provided with a lower pressing plate, the lower surface of the upper pressing plate and the upper surface of the lower pressing plate are both inclined surfaces, and the lower surface of the upper pressing plate abuts against the upper surface of the lower pressing plate.

[0012] Preferably, the auxiliary pushing component includes a third adjustment plate fixedly connected to the bottom end of the lower pressing plate, the third adjustment plate is slidably connected to the second adjustment plate at one end close to the gate plate, the second adjustment plate is slidably connected to the first adjustment plate at one end close to the gate plate, the inner side surface of the first adjustment plate is fixedly connected to a third spring having one end arranged on the second adjustment plate, the inner side surface of the second adjustment plate is fixedly connected to a second spring having one end arranged on the third adjustment plate, and the lower surfaces of the first adjustment plate, the second adjustment plate and the third adjustment plate all abut against the extrusion plate.

[0013] Preferably, each of the extrusion plates is composed of a plurality of extrusion blocks, and adjacent extrusion blocks are slidably connected, and each of the extrusion blocks is provided with a leakage guide port that can be connected sequentially, and the plurality of leakage guide ports are connected sequentially to form a leakage channel.

[0014] Preferably, the opening height increases gradually from the first leakage guide opening close to the gate plate to the last leakage guide opening far away from the gate plate, and a guide limiting component is provided at the top between two adjacent leakage guide openings.

[0015] Preferably, the guide limiting component includes a first limiting groove opened at the top of the extrusion block away from the gate plate, and the top of the extrusion block close to the gate plate is fixedly connected to a limiting hemispherical block, and the limiting hemispherical block is slidably connected in the first limiting groove.

[0016] Preferably, the inner bottom surface of the first leakage guide opening close to the gate plate to the last leakage guide opening far away from the gate plate moves downward to the greatest extent and is on the same slope as the inner bottom surface of the next leakage guide opening.

[0017] The present invention provides a flat gate valve, which has the following beneficial effects: 1. The flat gate valve, through the arrangement of the extrusion plate, the leakage channel and the power component, can collect the leaked liquid from the corresponding leakage channel when a leakage occurs at one place of the graphite packing. When the gate plate moves up and down, it will cause the extrusion rod to be inserted into the gathering chamber, thereby squeezing the liquid collected in the gathering chamber. The squeezed liquid will enter the first connecting channel through the second one-way valve, and the liquid in the first connecting channel will enter the auxiliary pressing block (wherein the first connecting channel and the auxiliary pressing block initially contain liquid). The liquid in the auxiliary pressing block The upper force-bearing plate will be squeezed to compress the first spring. At the same time, when the first spring is compressed, the force will be transferred to the lower output plate, so that the lower output plate can transfer the force to the auxiliary push plate through the connecting rod. The auxiliary push plate will transfer the force to the squeezing plate. Finally, the squeezing plate will press the leakage point of the graphite packing, so that the graphite packing will expand to both sides (observed from the cross section) to increase the sealing between the graphite packing and the gate plate, and can block the connected small gaps and holes. Therefore, it can increase the service life of the graphite packing while not squeezing the places where there are no leaks in the graphite packing.

[0018] 2. The flat gate valve, through the arrangement of the auxiliary pushing component, the elastic pushing component, the extrusion block and the connecting rod, can make the lower output plate move downward with the upper pressing plate when the lower output plate is subjected to downward pressure, and the upper pressing plate presses the lower pressing plate. At the same time, due to the arrangement of the inclined surface, the lower pressing plate will prompt the auxiliary pushing component to move downward, and at the same time, it will have a tendency to move toward the gate plate, so the third adjustment plate will also move toward the gate plate, so that when the pressure of the upper pressing plate on the lower pressing plate continues to increase, the lower pressing plate will prompt the third adjustment plate to continuously pressurize the extrusion block together with the second adjustment plate and the first adjustment plate. At the same time, because each extrusion plate is composed of a plurality of extrusion blocks, when the pressure of the upper pressing plate on the lower pressing plate continues to increase, the lower pressing plate will also It will bring the third adjustment plate to continuously move toward the gate plate. Therefore, when the pressing force of the extrusion block acts on the graphite packing, the pressure on the end of the graphite packing close to the gate plate will gradually increase in the cross section, while the pressure on the end away from the gate plate will gradually decrease. As a result, the graphite packing will expand toward the end with less pressure. This is because the graphite packing is a material with certain elasticity and plasticity. When it is subjected to vertical pressure, the distance between its internal molecules or particles will be compressed and reduced. Due to the incompressibility of the material, when it cannot continue to accommodate more materials in the vertical direction, it will seek space in the horizontal direction, resulting in expansion toward the end with less pressure. Therefore, while increasing the sealing between the leakage point of the graphite packing and the gate plate, it will also reduce the wear between the graphite packing and the gate plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the gate valve body of the present invention.

[0020] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the gate valve body of the present invention when viewed from the front.

[0021] Figure 3 For the present invention Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0022] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at point B.

[0023] Figure 5 It is a schematic diagram of the matching structure of the first adjustment plate, the second adjustment plate and the third adjustment plate of the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of the extruded block and the graphite packing of the present invention.

[0025] Figure 7 It is a structural schematic diagram of the auxiliary pressing block of the present invention.

[0026] Figure 8 It is a schematic diagram of the structure of the extrusion block of the gate plate of the present invention.

[0027] In the figure: 1. gate valve body; 2. gate plate; 3. cover plate; 4. extrusion rod; 5. valve body; 6. second one-way valve; 7. auxiliary pressing block; 8. auxiliary pressing cylinder; 9. upper force plate; 10. first spring; 11. lower output plate; 12. first connecting channel; 13. upper pressing plate; 14. lower pressing plate; 15. first adjusting plate; 16. extrusion block; 17. leakage guide port; 18. gathering chamber; 19. graphite packing; 21. second adjusting plate; 22. third adjusting plate; 23. limiting hemispherical block; 24. first limiting groove; 25. second spring; 26. third spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1 In the prior art, if a leak occurs between the graphite packing and the gate plate, the staff will often squeeze the graphite packing from top to bottom to reseal the graphite packing and the gate plate. However, in the prior art, when the graphite packing is pressurized, the entire graphite packing is pressurized. Although the leak can be re-sealed, other places without leakage will increase its wear. Because when the entire surface area of ​​the graphite packing is pressed from top to bottom, the graphite packing will expand to both sides when observed from the cross section. This is because the graphite packing is a material with certain elasticity and plasticity. When subjected to vertical pressure, the distance between the molecules or particles inside it will be compressed and reduced. Since the material is incompressible, when it cannot continue to accommodate more materials in the vertical direction, it will seek space in the horizontal direction, resulting in expansion to both sides. Therefore, when the graphite packing in the above patent is subjected to pressure, the places without leakage will increase its wear. This embodiment is specially invented to solve the above problem.

[0030] See also Figures 1 to 8The present invention provides a technical solution: a flat gate valve, including a gate valve body 1, and the gate valve body 1 includes a valve body 5 and a cover plate 3 arranged on the upper surface of the valve body 5, and a gate plate 2 that can move up and down and a graphite packing 19 for sealing the gate plate 2 are arranged in the valve body 5, wherein the graphite packing 19 is extruded in the valve body 5, and the gate plate 2 vertically passes through the graphite packing 19, and at the same time, a driving cylinder for driving the gate plate 2 to move up and down is arranged on the valve body 5, and because the gate valve body 1 has the same working principle as the common pneumatic knife gate valve on the market, it will not be described in detail, and the upper surface of the graphite packing 19 is provided with an extruded component with the same shape as the graphite packing 19.

[0031] The extrusion component includes a plurality of extrusion plates slidably connected to the valve body 5, and a leakage channel is penetrated on the side of the extrusion plate away from the gate plate 2, wherein the shapes of the plurality of extrusion plates combined are the same as the shape of the graphite packing 19 (such as Figure 6 As shown in the figure, a plurality of gathering cavities 18 connected to the leakage channel and corresponding to each other are provided in the valve body 5. The gathering cavities 18 are used to collect the liquid flowing out of the leakage channel. Therefore, when liquid leaks at one place of the graphite packing 19, the leaked liquid will flow into the gathering cavity 18 from the corresponding leakage channel, thereby collecting the flowing liquid.

[0032] A plurality of extrusion rods 4 that can be inserted into the corresponding gathering chamber 18 are evenly arranged on the gate plate 2, wherein the number of the extrusion rods 4, the gathering chamber 18 and the leakage channel are the same, and the positions are also one-to-one corresponding, so when the extrusion rod 4 is inserted into the gathering chamber 18, the liquid collected in the gathering chamber 18 will be squeezed.

[0033] A power component capable of receiving the thrust of the liquid in the gathering chamber 18 is arranged directly above the squeezing plate, and the bottom end of the power component abuts against the squeezing plate.

[0034] A first connecting channel 12 is also provided in the valve body 5, and its two ends are respectively connected to the bottom end of the gathering chamber 18 and the middle part of the gathering chamber 18, wherein the number of the first connecting channels 12 is the same as the gathering chamber 18, and the positions are also one-to-one corresponding, and a second one-way valve 6 is provided at the bottom end of the first connecting channel 12, wherein through the setting of the second one-way valve 6, when the liquid in the gathering chamber 18 is squeezed, it will enter the first connecting channel 12 from the second one-way valve 6, but the liquid will not flow from the first connecting channel 12 to the gathering chamber 18 through the second one-way valve 6, and an auxiliary pressing block 7 with one end inserted into the gathering chamber 18 is provided on the inner wall of the valve body 5 near the top of the extrusion plate, and the interior of the auxiliary pressing block 7 is a cavity, wherein the shape of the auxiliary pressing block 7 is as follows: Figure 7As shown, the squeezing rod 4 will penetrate the end of the auxiliary pressing block 7 away from the gate plate 2 when moving up and down, but there is a space between the auxiliary pressing block 7 and the squeezing rod 4, so that the two will not contact each other, and the end of the auxiliary pressing block 7 inserted in the gathering chamber 18 is connected to the top of the first connecting channel 12. Therefore, the liquid entering the first connecting channel 12 will enter the auxiliary pressing block 7 when it is subjected to pressure. The top of the power component is fixedly connected to the end of the auxiliary pressing block 7 close to the gate plate 2, and the top of the power component penetrates the lower surface of the auxiliary pressing block 7 and extends into the auxiliary pressing block 7.

[0035] The power component includes an auxiliary pressing cylinder 8 fixedly connected to the lower surface of the auxiliary pressing block 7, the top end of the auxiliary pressing cylinder 8 passes through the lower surface of the auxiliary pressing block 7 and extends into the auxiliary pressing block 7, so the top end of the auxiliary pressing cylinder 8 is connected to the cavity of the auxiliary pressing block 7, and there is a space for liquid to enter between the top end of the auxiliary pressing cylinder 8 and the inner top surface of the auxiliary pressing block 7, so when the liquid in the auxiliary pressing block 7 is subjected to pressure, it will enter the auxiliary pressing cylinder 8 from the top end of the auxiliary pressing cylinder 8, and the inner wall of the auxiliary pressing cylinder 8 is slidably connected with an elastic pushing component, and the bottom end of the elastic pushing component is fixedly connected with an auxiliary pushing component, and the bottom end of the auxiliary pushing component is in contact with the extrusion plate, so when the liquid in the auxiliary pressing cylinder 8 is subjected to pressure, the force will be transmitted to the elastic pushing component, so that the elastic pushing component will be compressed, and the elastic pushing component will also act on the pressure on the auxiliary pushing component, and then the auxiliary pushing component acts on the extrusion plate, so that the extrusion plate can press the graphite packing 19.

[0036] The elastic pushing component includes an upper force-bearing plate 9 slidably connected to the top of the inner wall of the auxiliary pressing cylinder 8 and a lower output plate 11 slidably connected to the bottom end of the inner wall of the auxiliary pressing cylinder 8. A first spring 10 is arranged between the upper force-bearing plate 9 and the lower output plate 11. A connecting rod is arranged on the lower surface of the lower output plate 11. The auxiliary pushing component is arranged at the bottom end of the connecting rod, and the lower surface of the auxiliary pushing component is in contact with the extrusion plate.

[0037] When leakage occurs at one place of the graphite packing 19, the leaked liquid will flow into the gathering chamber 18 from the corresponding leakage channel, so as to collect the leaked liquid. When the gate plate 2 moves up and down, it will prompt the extrusion rod 4 to be inserted into the gathering chamber 18, so as to squeeze the liquid collected in the gathering chamber 18. The squeezed liquid will enter the first connecting channel 12 through the second one-way valve 6, and the liquid in the first connecting channel 12 will enter the auxiliary pressing block 7 (the first connecting channel 12 and the auxiliary pressing block 7 are initially filled with liquid), and the liquid in the auxiliary pressing block 7 will squeeze the upper force plate 9. Thereby compressing the first spring 10, and when the first spring 10 is compressed again, it will also transfer force to the lower output plate 11, so that the lower output plate 11 can transfer force to the auxiliary push plate through the connecting rod, and the auxiliary push plate will transfer force to the extrusion plate, and finally the extrusion plate will press the leakage point of the graphite packing 19, so as to cause the graphite packing 19 to expand to both sides (from the cross-section) to increase the sealing between the graphite packing 19 and the gate plate 2, and can block the connected small gaps and holes, so that it can increase the service life of the graphite packing 19 while not squeezing the places where there are no leakage points of the graphite packing 19.

[0038] Embodiment 2 In the above embodiment, although only the leaking point of the graphite packing 19 can be pressed, the pressing method is still to press on the entire upper surface (only at the leaking point). Therefore, although the leakage problem can be solved, the wear of the leaking point of the graphite packing 19 will still be accelerated. This embodiment is specially invented to solve the above problem.

[0039] See also Figures 1 to 8 On the basis of the above embodiment, the technical solution adopted is that the connecting rod includes an upper pressing plate 13 fixedly connected to the lower surface of the lower output plate 11, and the upper surface of the auxiliary pushing component is provided with a lower pressing plate 14. The lower surface of the upper pressing plate 13 and the upper surface of the lower pressing plate 14 are both inclined surfaces. The lower surface of the upper pressing plate 13 abuts against the upper surface of the lower pressing plate 14. Therefore, when the upper pressing plate 13 moves downward, it will press the lower pressing plate 14. At the same time, through the setting of the inclined surface, the lower pressing plate 14 will prompt the auxiliary pushing component to move downward, and at the same time, it will produce a tendency to move toward the direction close to the gate plate 2.

[0040] The auxiliary pushing component includes a third adjustment plate 22 fixedly connected to the bottom end of the lower pressing plate 14, the end of the third adjustment plate 22 close to the gate plate 2 is slidably connected to the second adjustment plate 21, the end of the second adjustment plate 21 close to the gate plate 2 is slidably connected to the first adjustment plate 15, the inner side surface of the first adjustment plate 15 is fixedly connected to a third spring 26 with one end arranged on the second adjustment plate 21, the inner side surface of the second adjustment plate 21 is fixedly connected to a second spring 25 with one end arranged on the third adjustment plate 22, the lower surfaces of the first adjustment plate 15, the second adjustment plate 21 and the third adjustment plate 22 are all in contact with the extrusion plate, so when the lower pressing plate 14 has a tendency to move toward the gate plate 2, it will prompt the third adjustment plate 22 to have a tendency to move toward the gate plate 2.

[0041] Each extrusion plate is composed of a plurality of extrusion blocks 16, and adjacent extrusion blocks 16 are slidably connected, and each extrusion block 16 is provided with a leakage guide port 17 that can be connected one by one, and a plurality of leakage guide ports 17 are connected one by one to form a leakage channel, so when liquid leaks at one place of the graphite packing 19, the leaked liquid will flow into the gathering chamber 18 from the corresponding leakage guide port 17, wherein the extrusion block 16 closest to the gate plate 2 is provided with a guide groove (such as Figure 8 As shown), the top end of the guide groove is connected to the leakage guide port 17.

[0042] The opening height increases gradually from the first leakage guide opening 17 close to the gate plate 2 to the last leakage guide opening 17 far away from the gate plate 2 , and a guide limit component is provided at the top between two adjacent leakage guide openings 17 .

[0043] The guide limiting component includes a first limiting groove 24 opened at the top of the extrusion block 16 away from the gate plate 2. The top of the extrusion block 16 close to the gate plate 2 is fixedly connected to a limiting hemispherical block 23, and the limiting hemispherical block 23 is slidably connected in the first limiting groove 24.

[0044] From the first leakage guide port 17 close to the gate plate 2 to the last leakage guide port 17 far away from the gate plate 2, the maximum downward movement of the inner bottom surface is on the same slope as the inner bottom surface of the next leakage guide port 17. At the same time, starting from the direction close to the gate plate 2 to the direction gradually away from the gate plate 2, the maximum downward movement of the inner bottom surface of each leakage guide port 17 will be on the same slope as the inner bottom surface of the subsequent leakage guide port 17 (the position of the subsequent leakage guide port 17 here will not change), so when the extrusion block 16 moves downward, the inner bottom surface of the previous leakage guide port 17 will not be lower than the inner bottom surface of the subsequent leakage guide port 17, thereby preventing liquid from accumulating in one leakage guide port 17.

[0045] When the lower output plate 11 is subjected to downward pressure, the lower output plate 11 will move downward with the upper pressing plate 13, and the upper pressing plate 13 will press the lower pressing plate 14. At the same time, due to the setting of the inclined surface, the lower pressing plate 14 will prompt the auxiliary pushing component to move downward, and at the same time, it will produce a trend of moving toward the gate plate 2, so that the lower pressing plate 14 will move downward with the third adjustment plate 22, and at the same time, it will prompt the third adjustment plate 22 to move toward the gate plate 2. At the same time, when the third adjustment plate 22 moves downward, it will prompt the second adjustment plate 21 and the first adjustment plate 15 to move together, and the third adjustment plate 22 will move toward the gate plate 2. When the upper pressing plate 13 moves to the lower pressing plate 14, the second spring 25 and the third spring 26 will be squeezed (the elastic potential energy of the second spring 25 and the third spring 26 is the same), so the third adjustment plate 22 will also move in the direction close to the gate plate 2, so that when the pressure of the upper pressing plate 13 on the lower pressing plate 14 continues to increase, the lower pressing plate 14 will prompt the third adjustment plate 22 to bring the second adjustment plate 21 and the first adjustment plate 15 to continuously increase the pressure on the squeezing block 16. At the same time, because each squeezing plate is composed of a plurality of squeezing blocks 16, when the pressure of the upper pressing plate 13 on the lower pressing plate 14 continues to increase, the lower pressing plate 14 will also bring the third adjustment plate 22 to continuously approach the gate. 2, so when the pressing force of the extrusion block 16 acts on the graphite packing 19, the pressure on the end of the graphite packing 19 close to the gate plate 2 will gradually increase, while the pressure on the end away from the gate plate 2 will gradually decrease (when the lower pressing plate 14 continues to move in the direction close to the gate plate 2 with the third adjustment plate 22, the extrusion block 16 farthest from the gate plate 2 will be separated from the third adjustment plate 22 first, then the second extrusion block 16 will be separated from the third adjustment plate 22, and finally they will be separated one by one. At the same time, although the third adjustment plate 22 is separated from some extrusion blocks 16, the limiting hemispherical block 23 and the first limiting groove are still separated. The setting of 24 will still prompt the extrusion block 16 to extrude the graphite packing 19, but the extrusion force will be greatly reduced), so that the graphite packing 19 will expand toward the end with less pressure. This is because the graphite packing 19 is a material with certain elasticity and plasticity. When subjected to vertical pressure, the distance between the molecules or particles inside it will be compressed and reduced. Since the material is incompressible, when it cannot continue to accommodate more materials in the vertical direction, it will seek space in the horizontal direction, resulting in expansion toward the end with less pressure. Therefore, while increasing the sealing between the leakage point of the graphite packing 19 and the gate plate 2, it will also reduce the wear between the graphite packing 19 and the gate plate 2.

[0046] And when the leaking point continues to leak, the liquid will continue to flow into the gathering chamber 18 until the extrusion block 16 reseals the space between the graphite packing 19 and the gate plate 2. However, when the leaking point of the graphite packing 19 leaks again, the leaked liquid will still flow into the gathering chamber 18, and then the collected liquid will be squeezed again by the extrusion rod 4, and then the liquid will enter the first connecting channel 12 again, and then the thrust of the liquid will act on the upper force plate 9 again, and finally the force will be transmitted to the third adjustment plate 22, and then the leaking point will be sealed again.

[0047] To sum up, when the flat gate valve is in use, the liquid flowing out of the leakage point will flow into the gathering chamber 18 through the leakage guide port 17, and then the gathered liquid will be squeezed into the first connecting channel 12 through the up and down movement of the extrusion rod 4, and then the thrust of the liquid will eventually act on the extrusion block 16 through the lower output plate 11, and then the extrusion block 16 will press the leakage point of the graphite packing 19, so as to achieve the re-sealing of the gate plate 2 by the graphite packing 19.

[0048] At the same time, when the upper pressing plate 13 presses the lower pressing plate 14, it will prompt the lower pressing plate 14 to move downward and move in the direction close to the gate plate 2. Therefore, the lower pressing plate 14 will prompt the third adjusting plate 22 to move downward while prompting the third adjusting plate 22 to move in the direction close to the gate plate 2. Therefore, the third adjusting plate 22 will bring the second adjusting plate 21 and the first adjusting plate 15 to press the extrusion block 16. The extrusion block 16 will squeeze the graphite packing 19. At the same time, the third adjusting plate 22 will prompt the second adjusting plate 21 and the first adjusting plate 15 to move in the direction close to the gate plate 2. Therefore, the third adjusting plate 22, the second adjusting plate 21 and the first adjusting plate 15 can press the extrusion block 16 while gradually gathering the pressing force in the direction of the gate plate 2, thereby eliminating the leakage point between the graphite packing 19 and the gate plate 2 and greatly reducing the friction loss of the graphite packing 19.

[0049] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flat gate valve, comprising a gate valve body (1), wherein the gate valve body (1) comprises a valve body (5) and a cover plate (3) arranged on the upper surface of the valve body (5), and a gate plate (2) capable of moving up and down and a graphite packing (19) for sealing the gate plate (2) are arranged in the valve body (5), characterized in that: The upper surface of the graphite packing (19) is provided with an extruded component having the same shape as the graphite packing; The extrusion component comprises a plurality of extrusion plates slidably connected to the valve body (5), and a leakage channel is penetrated on a side of the extrusion plate away from the gate plate (2), and a plurality of collecting cavities (18) connected to the leakage channel and corresponding to each other are provided in the valve body (5), and the collecting cavities (18) are used to collect liquid flowing out of the leakage channel; The gate plate (2) is evenly provided with a plurality of extrusion rods (4) capable of being inserted into the corresponding gathering chambers (18); A power component capable of receiving a thrust from the liquid in the gathering chamber (18) is arranged directly above the extrusion plate, and the bottom end of the power component abuts against the extrusion plate.

2. A flat gate valve according to claim 1, characterized in that: The valve body (5) is also provided with a first connecting channel (12) whose two ends are respectively connected to the bottom end of the gathering chamber (18) and the middle part of the gathering chamber (18); a second one-way valve (6) is provided at the bottom end of the first connecting channel (12); an auxiliary pressing block (7) having one end inserted into the gathering chamber (18) is provided on the inner wall of the valve body (5) near the top of the extrusion plate; the interior of the auxiliary pressing block (7) is a hollow cavity; the end of the auxiliary pressing block (7) inserted into the gathering chamber (18) is connected to the top end of the first connecting channel (12); the top end of the power component is fixedly connected to the end of the auxiliary pressing block (7) near the gate plate (2); and the top end of the power component passes through the lower surface of the auxiliary pressing block (7) and extends into the auxiliary pressing block (7).

3. A flat gate valve according to claim 2, characterized in that: The power component comprises an auxiliary pressing cylinder (8) fixedly connected to the lower surface of the auxiliary pressing block (7); the top end of the auxiliary pressing cylinder (8) penetrates the lower surface of the auxiliary pressing block (7) and extends into the auxiliary pressing block (7); there is a space between the top end of the auxiliary pressing cylinder (8) and the inner top surface of the auxiliary pressing block (7) for liquid to enter; the inner wall of the auxiliary pressing cylinder (8) is slidably connected to an elastic pushing component; the bottom end of the elastic pushing component is fixedly connected to the auxiliary pushing component; the bottom end of the auxiliary pushing component abuts against the extrusion plate.

4. A flat gate valve according to claim 3, characterized in that: The elastic pushing component comprises an upper force-bearing plate (9) slidably connected to the top of the inner wall of the auxiliary pressing cylinder (8) and a lower output plate (11) slidably connected to the bottom end of the inner wall of the auxiliary pressing cylinder (8), a first spring (10) is arranged between the upper force-bearing plate (9) and the lower output plate (11), a connecting rod is arranged on the lower surface of the lower output plate (11), the auxiliary pushing component is arranged at the bottom end of the connecting rod, and the lower surface of the auxiliary pushing component abuts against the extrusion plate.

5. A flat gate valve according to claim 4, characterized in that: The connecting rod comprises an upper pressing plate (13) fixedly connected to the lower surface of the lower output plate (11); the upper surface of the auxiliary pushing component is provided with a lower pressing plate (14); the lower surface of the upper pressing plate (13) and the upper surface of the lower pressing plate (14) are both inclined surfaces; the lower surface of the upper pressing plate (13) abuts against the upper surface of the lower pressing plate (14).

6. A flat gate valve according to claim 5, characterized in that: The auxiliary pushing component comprises a third adjustment plate (22) fixedly connected to the bottom end of the lower pressing plate (14); an end of the third adjustment plate (22) close to the gate plate (2) is slidably connected to the second adjustment plate (21); an end of the second adjustment plate (21) close to the gate plate (2) is slidably connected to the first adjustment plate (15); an inner side surface of the first adjustment plate (15) is fixedly connected to a third spring (26) having one end arranged on the second adjustment plate (21); an inner side surface of the second adjustment plate (21) is fixedly connected to a second spring (25) having one end arranged on the third adjustment plate (22); and the lower surfaces of the first adjustment plate (15), the second adjustment plate (21) and the third adjustment plate (22) are all in contact with the extrusion plate.

7. A flat gate valve according to claim 6, characterized in that: Each of the extrusion plates is composed of a plurality of extrusion blocks (16), and adjacent extrusion blocks (16) are slidably connected to each other. Each of the extrusion blocks (16) is provided with a leakage guide port (17) that can be connected one by one, and the plurality of leakage guide ports (17) are connected one by one to form a leakage channel.

8. A flat gate valve according to claim 7, characterized in that: The opening height increases gradually from the first leakage guide opening (17) close to the gate plate (2) to the last leakage guide opening (17) far from the gate plate (2), and a guide limit component is provided at the top between two adjacent leakage guide openings (17).

9. A flat gate valve according to claim 8, characterized in that: The guide limiting component comprises a first limiting groove (24) formed at the top of the extrusion block (16) away from the gate plate (2); the top of the extrusion block (16) close to the gate plate (2) is fixedly connected to a limiting hemispherical block (23); and the limiting hemispherical block (23) is slidably connected in the first limiting groove (24).

10. A flat gate valve according to claim 9, characterized in that: The inner bottom surface of the first leakage guide opening (17) close to the gate plate (2) and the last leakage guide opening (17) far from the gate plate (2) moves downward to the maximum extent and is on the same slope as the inner bottom surface of the next leakage guide opening (17).

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