Fireproof flat gate valve

Abstract

The invention belongs to the technical field of valves, and particularly relates to a fireproof flat gate valve which comprises a valve body, a cavity pipe is fixedly installed in the valve body, flange plates are fixedly installed at the two ends of the cavity pipe, a plane gate plate is slidably connected to the inner wall of the valve body, a valve rod is arranged at the top of the plane gate plate, and a valve handle is fixedly installed at the top of the valve rod. Plate fixing assemblies are symmetrically arranged in the valve body; when the outside of the gate valve is on fire, the plate fixing assembly limits and fixes the plane gate plate so that the plane gate plate can be arranged in the cavity pipe to be attached to the outer wall of the cavity pipe all the time, meanwhile, the sealing rod assembly drives the elastic sealing block to move, the elastic sealing block can be attached to and fill the gap between the valve rod and the valve body, and it is prevented that a soft sealing piece in the gap is carbonized due to high temperature; when the gate valve is used, a medium in the pipeline leaks along a gap between the gate valve and the pipeline, the medium flowing in the pipeline can be better protected and blocked through mutual cooperation of the gate valve and the pipeline, external flames are prevented from affecting the medium in the pipeline, and operation of the gate valve is better facilitated.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically a fireproof flat gate valve. Background Technology

[0002] A gate valve is a commonly used shut-off valve. Its core definition is that it uses a gate to move up and down vertically along the channel axis to connect or disconnect the medium in the pipeline, such as liquid or gas. The direction of the gate's movement is perpendicular to the direction of the medium flow. It is mainly used for fully open or fully closed conditions in pipelines and is not suitable for regulation or throttling.

[0003] A flat gate valve is a type of valve that uses a flat gate (rather than the wedge-shaped gate commonly found in gate valves) parallel to the direction of medium flow to achieve a seal. It has a simple structure, low flow resistance, and is suitable for pipelines with large diameter, high viscosity media, or media containing a small amount of particles. It is mainly used in the oil and gas industry, petrochemical and refining industry, coal and slurry industry, and urban energy and public utilities.

[0004] In current technology, when operating a flat gate valve, to prevent leakage of the medium during use, multiple soft seals are usually combined between the inside of the gate valve and the valve stem. Since the soft seals have a certain degree of fusibility, when a fire occurs outside the valve, the internal soft seals may carbonize due to high temperature and lose their sealing function, causing the medium in the pipeline to leak out through the gaps between them. This is not conducive to blocking the medium in the pipeline during a fire.

[0005] Therefore, the present invention provides a fireproof flat gate valve. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A fireproof flat gate valve of the present invention includes a valve body, a cavity tube fixedly installed inside the valve body, flanges fixedly installed at both ends of the cavity tube, a flat gate plate slidably connected to the inner wall of the valve body, a valve stem provided at the top of the flat gate plate, a valve handle fixedly installed at the top of the valve stem, a fixed plate assembly symmetrically arranged inside the valve body, the fixed plate assembly is used to limit and fix the flat gate plate when the gate valve is on fire outside, and a sealing rod assembly symmetrically arranged inside the valve body, the sealing rod assembly is placed above the fixed plate assembly, the two fixed plate assemblies and the two sealing rod assemblies are respectively placed on one side of the valve stem, the sealing rod assembly includes an elastic sealing block, the sealing rod assembly is used to drive the elastic sealing block to fit and seal between the valve stem and the valve body when the gate valve is on fire outside.

[0008] Preferably, the fixed plate assembly includes a fixed plate, a pusher bracket is fixedly installed on one side of the fixed plate, and multiple delay springs are provided between one side of the fixed plate and the inner wall of the valve body. The multiple delay springs are respectively placed on the outside of the pusher bracket. The outer wall of the fixed plate is slidably connected to the inner wall of the valve body. A slanted pressure port is opened on one side of the bottom of the fixed plate, and the bottom of the plate can fit and contact the top of the flat gate.

[0009] Preferably, a shaft is fixedly installed on the top of the flat gate, and a shaft groove is opened on the inner wall of the shaft. A screw is fixedly installed on the top inner wall of the valve body. The outer wall of the valve stem can be threadedly connected to the inner wall of the screw. A hanging plate is fixedly installed at the bottom of the valve stem. The hanging plate is placed inside the shaft groove, and the outer wall of the hanging plate can be slidably connected to the inner wall of the shaft groove.

[0010] Preferably, a pressure sensor is fixedly installed on the inner wall of the shaft groove, a pressure plate is slidably connected to the inner wall of the shaft groove, and multiple pressure springs are provided between the bottom of the pressure plate and the inner wall of the shaft groove. All the pressure springs are placed outside the pressure sensor, and the bottom of the hanging plate can rotate in contact with the top of the pressure plate.

[0011] Preferably, a fitting groove is provided in the middle of the inner wall of the solid plate, and a plug rod is fixedly installed on the inner wall of the fitting groove. The inner wall of the fitting groove can fit against the outer wall of the shaft rod, and an insertion port is provided on the inner wall of the shaft rod. The outer wall of the plug rod can be inserted into the inner wall of the insertion port.

[0012] Preferably, the sealing rod assembly further includes a rectangular block, with multiple ball rods slidably connected inside the rectangular block. One end of each ball rod is movably connected to the inner wall of the elastic sealing block, and the outer wall of the elastic sealing block is slidably connected to the inside of the valve body. The outer wall of the elastic sealing block can fit and contact the outer wall of the valve stem.

[0013] Preferably, the inner wall of the rectangular block is fixedly installed with multiple grooved shafts, the outer walls of multiple ball rods are slidably connected to the inner walls of the multiple grooved shafts respectively, and a return spring is provided between the other end of the multiple ball rods and the inner wall of the grooved shaft.

[0014] Preferably, a telescopic rod is fixedly installed on the inner wall of the valve body, and a connecting plate is fixedly installed on the output end of the telescopic rod. The bottom of the connecting plate is fixedly connected to the top of the push frame, and the top of the connecting plate is fixedly connected to the bottom of the rectangular block.

[0015] Preferably, four guide shafts are fixedly installed inside the valve body. The four guide shafts are all placed between the elastic sealing block and the fixed plate. The four guide shafts are respectively placed at the four corners of the connecting plate. The outer walls of the four guide shafts are slidably connected to the inner wall of the connecting plate.

[0016] Preferably, two spray boxes are symmetrically fixedly installed on the top of the valve body. The two spray boxes are respectively placed on one side of the valve handle. Spraying devices are fixedly installed inside the two spray boxes. Spray nozzles are fixedly installed on the outer walls of the two spraying devices. Multiple spray nozzles are respectively placed around the top of the valve body.

[0017] The beneficial effects of this invention are as follows: 1. The fireproof flat gate valve of the present invention, when the gate valve is on fire outside, the fixed plate assembly limits and fixes the flat gate plate, so that it is always in contact with the outer wall of the cavity tube. At the same time, the sealing rod assembly drives the elastic sealing block to move, and the elastic sealing block will fit and fill the gap between the valve stem and the valve body, preventing the soft seal inside from carbonizing due to high temperature and the medium in the pipeline from leaking out through the gap between the two. The two work together to better protect and block the medium flowing in the pipeline, prevent the external flame from affecting the medium in the pipeline, and make the gate valve operation more convenient.

[0018] 2. The fireproof flat gate valve of the present invention, when the outside of the gate valve is on fire, pushes the pusher to move, which in turn drives the fixed plate to pull the deceleration spring to move. The two fixed plates then move relative to each other in the valve body. When one side of the two fixed plates is in contact with each other, the pusher stops moving the fixed plates, and the two fixed plates will be in contact with each other at the top of the flat gate plate, thereby limiting and fixing the top of the fixed plate. This prevents the flat gate plate from moving in the cavity when the outside of the gate valve is on fire, which would affect the cut-off operation of the medium in the cavity, and serves to limit and fix the flat gate plate.

[0019] 3. The fireproof flat gate valve of the present invention, when the fixed plate moves to fit against the top of the flat gate, the fitting groove in the fixed plate will fit against the outer wall of the shaft. When one side of the two fixed plates fits against each other to limit and fix the flat gate, the inner wall of the two fitting grooves will fit against the outer wall of the shaft and wrap it. The insert rod in the fitting groove will be inserted into the socket, thereby connecting the fixed plate and the shaft. The two fixed plates provide secondary reinforcement and limitation for the flat gate, making it more stable in fixing the flat gate.

[0020] 4. The fireproof flat gate valve of the present invention, when the elastic sealing block contacts the outer wall of the valve stem, by continuing to push the rectangular block to move, the rectangular block will drive the groove shaft to continue to move. With the setting of the return spring, when the groove shaft moves, the groove shaft will squeeze the return spring and slide towards the ball rod. When the outer walls of both elastic sealing blocks are in contact with the outer wall of the valve stem, the movement of the rectangular block is stopped. The elastic sealing block will then wrap the valve stem by the elastic push of the return spring, thereby performing a filling and sealing operation between the valve stem and the valve body.

[0021] 5. The fireproof flat gate valve of the present invention connects a liquid flow pipe to the connection port at the top of the spray box. When the outside of the gate valve catches fire, the spray device inside the spray box is driven to operate, and the liquid will enter the spray device through the connection port. Then the spray device will spray the liquid around the outside of the valve body through the nozzle to perform cooling and fire extinguishing operations, which can reduce the temperature of the valve body and play the role of spray cooling. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is an overall diagram of the invention; Figure 2 This is a main body diagram of the present invention; Figure 3 This is a schematic diagram of the valve stem structure in this invention; Figure 4 This is a schematic diagram of the structure of the solid plate in this invention; Figure 5 This is a schematic diagram of the structure of the connecting plate in this invention; Figure 6 This is a schematic diagram of the structure of the cue in this invention; Figure 7 This is a schematic diagram of the insertion rod in this invention.

[0024] In the diagram: 1. Valve body; 101. Flange; 102. Cavity tube; 2. Spray box; 201. Spray device; 202. Nozzle; 3. Valve handle; 301. Valve stem; 302. Shaft; 4. Flat gate; 5. Screw shaft; 6. Elastic sealing block; 601. Rectangular block; 602. Grooved shaft; 603. Ball rod; 604. Return spring; 7. Fixed plate; 701. Inclined pressure port; 702. Push frame; 703. Fitting groove; 8. Telescopic rod; 801. Connecting plate; 802. Guide shaft; 9. Insert rod; 901. Socket; 10. Relief spring; 11. Pressure sensor; 12. Pressure plate; 1201. Bearing spring; 1202. Hanging plate; 1203. Shaft groove. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] like Figures 1 to 7As shown in the embodiment of the present invention, a fireproof flat gate valve includes a valve body 1. A cavity tube 102 is fixedly installed inside the valve body 1. Flanges 101 are fixedly installed at both ends of the cavity tube 102. A flat gate plate 4 is slidably connected to the inner wall of the valve body 1. A valve stem 301 is provided on the top of the flat gate plate 4. A valve handle 3 is fixedly installed on the top of the valve stem 301. A fixed plate assembly is symmetrically arranged inside the valve body 1. The fixed plate assembly is used to limit and fix the flat gate plate 4 when the gate valve is on fire. A sealing rod assembly is symmetrically arranged inside the valve body 1. The sealing rod assembly is placed above the fixed plate assembly. The two fixed plate assemblies and the two sealing rod assemblies are respectively placed on one side of the valve stem 301. The sealing rod assembly includes an elastic sealing block 6. When the gate valve is on fire, the sealing rod assembly drives the elastic sealing block 6 to seal the valve stem 301 and the valve body 1. Because soft seals have a certain degree of fusibility, when a fire starts outside the valve, the soft seal inside may carbonize due to high temperature and lose its sealing function, resulting in the leakage of the medium in the pipeline through the gap between the two. Before use, align the flange 101 on the flow pipe with the flange 101 on the cavity 102, and then use bolts and nuts to fix them together. Once the connection is complete, the connection between the flow pipe and the gate valve is finished. When it is necessary to drive the gate valve to close, operate by turning the valve handle 3. The valve handle 3 will then drive the flat gate 4 to move downwards within the valve body 1 via the valve stem 301. The flat gate 4 will move from within the valve body 1 into the cavity 102. When the outer wall of the flat gate 4 contacts the lowest point of the inner wall of the cavity 102, the flat gate 4 will make contact with the inner wall of the cavity 102, thus blocking the medium flowing between the cavity 102. Conversely, when the valve handle 3 is rotated in the opposite direction, the flat gate 4 will move upward from inside the cavity 102 and open, thereby realizing the operation of the gate valve in the fully open or fully closed state. When a fire occurs outside the gate valve, the fixed plate assembly and the sealing rod assembly are activated. During operation, the fixed plate assembly limits and fixes the flat gate 4, ensuring it remains in contact with the outer wall of the cavity 102. This prevents the flat gate 4 from failing in the event of a fire, thus avoiding any impact on the medium within the pipeline. Simultaneously, the sealing rod assembly moves the elastic sealing block 6, which then fills the gap between the valve stem 301 and the valve body 1, sealing the space between them. This prevents the internal soft seal from carbonizing due to high temperatures and losing its sealing effect, allowing the medium in the pipeline to leak out through the gap. This emergency sealing operation, with both components working together, better protects and isolates the medium flowing in the pipeline when the gate valve is on fire, preventing external flames from affecting the medium and facilitating the operation of the gate valve. It should be noted that this device should be made of high-temperature resistant material, and the medium conveyed in the pipeline can be gas, liquid, or steam.

[0027] like Figures 3 to 7 As shown, the fixed plate assembly includes a fixed plate 7. A pusher frame 702 is fixedly installed on one side of the fixed plate 7. Multiple buffer springs 10 are provided between one side of the fixed plate 7 and the inner wall of the valve body 1. The multiple buffer springs 10 are respectively placed on the outside of the pusher frame 702. The outer wall of the fixed plate 7 is slidably connected to the inner wall of the valve body 1. A slanted pressure port 701 is opened on one side of the bottom of the fixed plate 7, and the bottom can fit and contact the top of the flat gate plate 4. When the gate valve is on fire, the pusher 702 is moved, which in turn moves the fixed plate 7 and the deceleration spring 10. The two fixed plates 7 then move relative to each other within the valve body 1. When one side of the two fixed plates 7 is in contact with each other, the pusher stops moving the fixed plates 7, and the two fixed plates 7 come into contact with the top of the flat gate plate 4, thereby limiting and fixing the top of the fixed plate 7. This prevents the flat gate plate 4 from moving within the cavity tube 102 when the gate valve is on fire, thus affecting the mediating cut-off operation within the cavity tube 102. The inclined pressure port 701 is designed so that when the gate valve is on fire and the flat gate plate 4 is displaced and moves upward due to the influence of the cavity tube 102, the fixed plate 7 can push the flat gate plate 4 back into the cavity tube 102 through the inclined pressure port 701, so that the flat gate plate 4 can be better fixed.

[0028] like Figures 3 to 7 As shown, a shaft 302 is fixedly installed on the top of the flat gate plate 4. A shaft groove 1203 is opened on the inner wall of the shaft 302. A screw shaft 5 is fixedly installed on the top inner wall of the valve body 1. The outer wall of the valve stem 301 can be threadedly connected to the inner wall of the screw shaft 5. A hanging plate 1202 is fixedly installed at the bottom end of the valve stem 301. The hanging plate 1202 is placed inside the shaft groove 1203 and the outer wall of the hanging plate 1202 can be slidably connected to the inner wall of the shaft groove 1203. When the valve handle 3 is rotated, the valve handle 3 will drive the hanging plate 1202 to rotate in the shaft groove 1203 in the shaft 302 through the valve stem 301. Through the threaded guidance of the screw shaft 5, when the valve stem 301 rotates, the valve stem 301 and the screw shaft 5 will have threaded transmission. The valve stem 301 will then drive the flat gate 4 to move up and down in the valve body 1 through the shaft 302, thereby realizing the movement operation of the flat gate 4, thereby driving the flat gate 4 to cut off or allow the flow of the medium in the cavity tube 102.

[0029] like Figures 6 to 7 As shown, a pressure sensor 11 is fixedly installed on the inner wall of the shaft groove 1203, and a pressure plate 12 is slidably connected to the inner wall of the shaft groove 1203. Multiple pressure springs 1201 are provided between the bottom of the pressure plate 12 and the inner wall of the shaft groove 1203. All multiple pressure springs 1201 are placed outside the pressure sensor 11. The bottom of the hanging plate 1202 can rotate in contact with the top of the pressure plate 12. Because the metal material of the valve stem 301 has the physical property of thermal expansion and contraction, when the temperature rises, the thermal motion of atoms or molecules inside the material intensifies, the average distance between atoms increases, and its length elongates. Therefore, when a fire occurs outside the gate valve, the valve stem 301 will elongate due to heat. The valve stem 301 will drive the hanging plate 1202 to move downward in the shaft groove 1203. The hanging plate 1202 will push the pressure plate 12 to squeeze the pressure spring 1201 downward. The pressure plate 12 will then squeeze the pressure sensor 11, causing the pressure sensor 11 to... It will perform sensor control operations to drive the sealing rod assembly and the fixed plate assembly to operate, thus playing the role of controlling the operation of the sealing rod assembly and the fixed plate assembly. It should be noted that the pressure spring 1201 is set to support the pressure plate 12. When the valve stem 301 moves through the threaded transmission of the screw shaft 5, the lifting plate 1202 will push the pressure plate 12, thereby driving the flat gate 4 to move downward through the shaft 302. The elastic support strength of the pressure spring 1201 needs to be designed according to the actual operation scenario.

[0030] like Figures 5 to 7 As shown, a fitting groove 703 is provided in the middle of the inner wall of the solid plate 7. A plug rod 9 is fixedly installed on the inner wall of the fitting groove 703. The inner wall of the fitting groove 703 can fit against the outer wall of the shaft 302. A socket 901 is provided on the inner wall of the shaft 302. The outer wall of the plug rod 9 can be inserted into the inner wall of the socket 901. When the fixed plate 7 moves to fit against the top of the flat gate plate 4, the fitting groove 703 in the fixed plate 7 will move and fit against the outer wall of the shaft 302. When one side of the two fixed plates 7 fits and contacts the flat gate plate 4 to limit and fix it, the inner wall of the two fitting grooves 703 will fit against the outer wall of the shaft 302 and wrap it. The insert rod 9 in the fitting groove 703 will be inserted into the insertion port 901, thereby connecting the fixed plate 7 and the shaft 302. This allows the two fixed plates 7 to provide secondary reinforcement and limit the flat gate plate 4, making it more stable in fixing the flat gate plate 4.

[0031] like Figures 5 to 6 As shown, the sealing rod assembly also includes a rectangular block 601, and multiple ball rods 603 are slidably connected inside the rectangular block 601. One end of each ball rod 603 is movably connected to the inner wall of the elastic sealing block 6. The outer wall of the elastic sealing block 6 is slidably connected to the inside of the valve body 1, and the outer wall of the elastic sealing block 6 can fit and contact the outer wall of the valve stem 301. When the pressure sensor 11 detects that the valve stem 301 has expanded due to heat, it pushes the rectangular block 601 to move. The rectangular block 601 then moves the elastic sealing block 6 towards the outer wall of the valve stem 301 via the ball rod 603. The two elastic sealing blocks 6 then move from both sides of the valve stem 301 towards the outer wall of the valve stem 301 and fit together. When the outer walls of the two elastic sealing blocks 6 come into contact with each other, the elastic properties of the two elastic sealing blocks 6 will wrap around the valve stem 301, thereby filling the space between the valve stem 301 and the valve body 1 and sealing the space between the valve stem 301 and the valve body 1.

[0032] like Figures 5 to 6 As shown, multiple slotted shafts 602 are fixedly installed on the inner wall of the rectangular block 601, and the outer walls of multiple ball rods 603 are slidably connected to the inner walls of the multiple slotted shafts 602 respectively. A return spring 604 is provided between the other end of the multiple ball rods 603 and the inner wall of the slotted shafts 602. When the elastic sealing block 6 contacts the outer wall of the valve stem 301, by continuing to push the rectangular block 601 to move, the rectangular block 601 will drive the groove shaft 602 to continue to move. Due to the setting of the return spring 604, when the groove shaft 602 moves, the groove shaft 602 will squeeze the return spring 604 and slide onto the ball rod 603. When the outer walls of the two elastic sealing blocks 6 are both in contact with the outer wall of the valve stem 301, at this time, the pushing of the rectangular block 601 is stopped. The elastic sealing block 6 will then wrap the valve stem 301 by the elastic push of the return spring 604, thereby filling and sealing the space between the valve stem 301 and the valve body 1, and playing the role of fitting and covering the outer wall of the valve stem 301.

[0033] like Figures 3 to 5 As shown, a telescopic rod 8 is fixedly installed on the inner wall of the valve body 1, and a connecting plate 801 is fixedly installed on the output end of the telescopic rod 8. The bottom of the connecting plate 801 is fixedly connected to the top of the push frame 702, and the top of the connecting plate 801 is fixedly connected to the bottom of the rectangular block 601. When it is necessary to move the elastic sealing block 6 and the fixed plate 7, the telescopic rod 8 is driven to extend and retract, which in turn moves the connecting plate 801. When the connecting plate 801 moves, it will move the fixed plate 7 and the rectangular block 601, thus enabling them to move and thus promoting the movement of the fixed plate 7 and the rectangular block 601.

[0034] like Figures 3 to 4 As shown, four guide shafts 802 are fixedly installed inside the valve body 1. The four guide shafts 802 are all placed between the elastic sealing block 6 and the fixed plate 7. The four guide shafts 802 are respectively placed at the four corners of the connecting plate 801. The outer walls of the four guide shafts 802 are slidably connected to the inner wall of the connecting plate 801. When the connecting plate 801 moves, the guide shaft 802 will drive the fixed plate 7 and the rectangular block 601 to move on the guide shaft 802. On the one hand, it can provide guidance for the movement of the connecting plate 801, so that it can move in the same direction. On the other hand, it can provide movement support for the movement of the connecting plate 801. By setting the four corner positions of the four guide shafts 802, the connecting plate 801 can be more stable when moving, which is more conducive to the movement of the elastic sealing block 6 and the fixed plate 7.

[0035] like Figures 1 to 2 As shown, spray boxes 2 are symmetrically fixedly installed on the top of valve body 1. The two spray boxes 2 are respectively placed on one side of valve handle 3. Spraying devices 201 are fixedly installed inside the two spray boxes 2. Spray nozzles 202 are fixedly installed on the outer walls of the two spraying devices 201. Multiple spray nozzles 202 are respectively placed around the top of valve body 1. Before use, a liquid flow pipe is connected to the connection port at the top of the spray box 2. When the outside of the gate valve catches fire, the spray device 201 inside the spray box 2 is driven to operate, and the liquid will enter the spray device 201 through the connection port. Then, the spray device 201 will spray the liquid onto the outside of the valve body 1 through the nozzle 202 to perform cooling and fire extinguishing operations, reduce the temperature of the valve body 1, and play the role of spray cooling. It should be noted that the liquid sprayed by the spray device 201 can be water. The spray device 201 can be composed of components such as a power source and rigid pipes. It is mainly used to spray liquid onto the outside of the valve body 1. This is existing technology, so it is only described in this solution, and its specific structure is not described.

[0036] Working Principle: Before use, align the flange 101 on the flow pipeline with the flange 101 on the cavity 102, and then secure them together with bolts and nuts. Once connected, the flow pipeline and the gate valve are connected. To close the gate valve, rotate the valve handle 3. The valve handle 3, via the valve stem 301, moves the flat gate 4 downwards within the valve body 1. The flat gate 4 then moves from the valve body 1 into the cavity 102. When the outer wall of the flat gate 4 contacts the lowest point of the inner wall of the cavity 102, it makes contact with the inner wall of the cavity 102, thus blocking the flow of medium between the cavity 102. Conversely, rotating the valve handle 3 in the opposite direction moves the flat gate 4 upwards from the cavity 102, opening the valve and allowing it to operate fully open or fully closed. When a fire occurs outside the gate valve, the fixed plate assembly and the sealing rod assembly work together. The fixed plate assembly limits and fixes the flat gate 4, keeping it in contact with the outer wall of the cavity 102. This prevents the flat gate 4 from failing to function during a fire, thus avoiding the inability to cut off and block the medium in the pipeline and affecting the medium. At the same time, the sealing rod assembly drives the elastic sealing block 6 to move, which then fits and fills the space between the valve stem 301 and the valve body 1, thereby sealing the space between the valve stem 301 and the valve body 1. This prevents the internal soft seal from carbonizing due to high temperature and losing its sealing effect. The medium in the pipeline leaks out through the gap between the two, performing an emergency sealing operation. The two work together to better protect and block the medium flowing in the pipeline when a fire occurs outside the gate valve, preventing the external flame from affecting the medium in the pipeline and making the operation of the gate valve more convenient. When the gate valve is on fire, the pusher 702 is moved by pushing it. The pusher 702 will then move the fixed plate 7 and pull the deceleration spring 10. The two fixed plates 7 will move relative to each other in the valve body 1. When one side of the two fixed plates 7 is in contact with each other, the pusher 7 is stopped. The two fixed plates 7 will then be in contact with the top of the flat gate plate 4, thereby limiting and fixing the top of the fixed plate 7. This prevents the flat gate plate 4 from moving in the cavity tube 102 when the gate valve is on fire, which would affect the mediating cut-off operation in the cavity tube 102. The inclined pressure port 701 is set so that when the gate valve is on fire and the flat gate plate 4 is affected and moves upward due to displacement, the fixed plate 7 can push the flat gate plate 4 back into the cavity tube 102 through the inclined pressure port 701, so that the flat gate plate 4 can be better fixed. When the valve handle 3 is rotated, the valve handle 3 will drive the hanging plate 1202 to rotate in the shaft groove 1203 in the shaft 302 through the valve stem 301. Through the threaded guidance of the screw shaft 5, when the valve stem 301 rotates, the valve stem 301 and the screw shaft 5 will be threadedly driven. The valve stem 301 will then drive the flat gate 4 to move up and down in the valve body 1 through the shaft 302, thereby realizing the movement operation of the flat gate 4, thereby driving the flat gate 4 to cut off or allow the flow of the medium in the cavity tube 102. When a fire occurs outside the gate valve, the valve stem 301 will extend due to heat. The valve stem 301 will drive the lifting plate 1202 to move down in the shaft groove 1203. The lifting plate 1202 will push the pressure plate 12 to squeeze the pressure spring 1201 to move down. The pressure plate 12 will squeeze the pressure sensor 11, and the pressure sensor 11 will perform sensing and control operations, thereby driving the sealing rod assembly and the fixed plate assembly to operate, thus playing the role of controlling the operation of the sealing rod assembly and the fixed plate assembly. When the fixed plate 7 moves to fit against the top of the flat gate plate 4, the fitting groove 703 in the fixed plate 7 will move against the outer wall of the shaft 302. When one side of the two fixed plates 7 fits against each other to limit and fix the flat gate plate 4, the inner wall of the two fitting grooves 703 will fit against the outer wall of the shaft 302 to wrap it. The insert rod 9 in the fitting groove 703 will be inserted into the insertion port 901, thereby connecting the fixed plate 7 and the shaft 302. This allows the two fixed plates 7 to provide secondary reinforcement and limit the flat gate plate 4, making it more stable to fix the flat gate plate 4. When the pressure sensor 11 detects that the valve stem 301 has expanded due to heat, it pushes the rectangular block 601 to move. The rectangular block 601 then drives the elastic sealing block 6 to move towards the outer wall of the valve stem 301 via the ball rod 603. The two elastic sealing blocks 6 then move from both sides of the valve stem 301 towards the outer wall of the valve stem 301 and fit together. When the outer walls of the two elastic sealing blocks 6 come into contact with each other, the two elastic sealing blocks 6 will wrap around the valve stem 301 due to the elastic properties of the elastic sealing blocks 6, thereby filling the space between the valve stem 301 and the valve body 1 and sealing the space between the valve stem 301 and the valve body 1. When the elastic sealing block 6 contacts the outer wall of the valve stem 301, by continuing to push the rectangular block 601 to move, the rectangular block 601 will drive the groove shaft 602 to continue to move. Due to the setting of the return spring 604, when the groove shaft 602 moves, the groove shaft 602 will squeeze the return spring 604 and slide onto the ball rod 603. When the outer walls of the two elastic sealing blocks 6 are both in contact with the outer wall of the valve stem 301, at this time, stop pushing the rectangular block 601 to move. The elastic sealing block 6 will then wrap the valve stem 301 by the elastic push of the return spring 604, thereby filling and sealing the space between the valve stem 301 and the valve body 1, and playing the role of fitting and covering the outer wall of the valve stem 301. When it is necessary to move the elastic sealing block 6 and the fixed plate 7, the telescopic rod 8 is driven to move. The telescopic rod 8 will extend and retract, causing the connecting plate 801 to move. When the connecting plate 801 moves, it will cause the fixed plate 7 and the rectangular block 601 to move, thus enabling them to move and play the role of pushing the fixed plate 7 and the rectangular block 601 to move. When the connecting plate 801 moves, the guide shaft 802 will drive the fixed plate 7 and the rectangular block 601 to move on the guide shaft 802. On the one hand, it can provide guidance for the movement of the connecting plate 801, so that it can move in the same direction. On the other hand, it can provide movement support for the movement of the connecting plate 801. By setting the four corner positions of the four guide shafts 802, the connecting plate 801 can be more stable when moving, which is more conducive to the movement of the elastic sealing block 6 and the fixed plate 7. Before use, a liquid flow pipe is connected to the connection port at the top of the spray box 2. When the outside of the gate valve catches fire, the spray device 201 inside the spray box 2 is driven to operate. The liquid will enter the spray device 201 through the connection port. Then the spray device 201 will spray the liquid onto the outside of the valve body 1 through the nozzle 202 to perform cooling and fire extinguishing operations, reduce the temperature of the valve body 1, and play the role of spray cooling.

[0037] The foregoing has shown and described the basic principles, 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 embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fireproof flat gate valve, characterized in that: The valve body includes a cavity tube fixedly installed inside, with flanges fixedly installed at both ends. A flat gate is slidably connected to the inner wall of the valve body, and a valve stem is provided on the top of the flat gate. A valve handle is fixedly installed on the top of the valve stem. A fixed plate assembly is symmetrically arranged inside the valve body. The fixed plate assembly is used to limit and fix the flat gate when the external fire of the gate valve occurs. A sealing rod assembly is symmetrically arranged inside the valve body, with the sealing rod assembly positioned above the fixed plate assembly. The two fixed plate assemblies and the two sealing rod assemblies are respectively positioned on one side of the valve stem. The sealing rod assembly includes an elastic sealing block. When the external fire of the gate valve occurs, the sealing rod assembly drives the elastic sealing block to seal the valve stem and the valve body.

2. The fireproof flat gate valve according to claim 1, characterized in that: The fixed plate assembly includes a fixed plate, a pusher bracket is fixedly installed on one side of the fixed plate, and multiple delay springs are provided between one side of the fixed plate and the inner wall of the valve body. The multiple delay springs are respectively placed on the outside of the pusher bracket. The outer wall of the fixed plate is slidably connected to the inner wall of the valve body. A slanted pressure port is opened on one side of the bottom of the fixed plate, and the bottom can fit and contact the top of the flat gate.

3. A fireproof flat gate valve according to claim 2, characterized in that: A shaft is fixedly installed on the top of the flat gate plate. A shaft groove is opened on the inner wall of the shaft. A screw is fixedly installed on the top inner wall of the valve body. The outer wall of the valve stem can be threadedly connected to the inner wall of the screw. A hanging plate is fixedly installed at the bottom of the valve stem. The hanging plate is placed inside the shaft groove and the outer wall of the hanging plate can be slidably connected to the inner wall of the shaft groove.

4. A fireproof flat gate valve according to claim 3, characterized in that: A pressure sensor is fixedly installed on the inner wall of the shaft groove, and a pressure plate is slidably connected to the inner wall of the shaft groove. Multiple pressure springs are set between the bottom of the pressure plate and the inner wall of the shaft groove. All the pressure springs are placed outside the pressure sensor, and the bottom of the hanging plate can fit and rotate with the top of the pressure plate.

5. A fireproof flat gate valve according to claim 4, characterized in that: A fitting groove is provided in the middle of the inner wall of the solid plate. A plug rod is fixedly installed on the inner wall of the fitting groove. The inner wall of the fitting groove can fit against the outer wall of the shaft rod. A socket is provided on the inner wall of the shaft rod. The outer wall of the plug rod can be inserted into the inner wall of the socket.

6. A fireproof flat gate valve according to claim 5, characterized in that: The sealing rod assembly also includes a rectangular block, with multiple ball rods slidably connected inside the rectangular block. One end of each ball rod is movably connected to the inner wall of the elastic sealing block. The outer wall of the elastic sealing block is slidably connected to the inside of the valve body, and the outer wall of the elastic sealing block can fit and contact the outer wall of the valve stem.

7. A fireproof flat gate valve according to claim 6, characterized in that: Multiple slotted shafts are fixedly installed on the inner wall of the rectangular block. The outer walls of multiple ball rods are slidably connected to the inner walls of the multiple slotted shafts. A return spring is provided between the other end of the multiple ball rods and the inner wall of the slotted shaft.

8. A fireproof flat gate valve according to claim 7, characterized in that: A telescopic rod is fixedly installed on the inner wall of the valve body. A connecting plate is fixedly installed on the output end of the telescopic rod. The bottom of the connecting plate is fixedly connected to the top of the push frame, and the top of the connecting plate is fixedly connected to the bottom of the rectangular block.

9. A fireproof flat gate valve according to claim 8, characterized in that: Four guide shafts are fixedly installed inside the valve body. The four guide shafts are all placed between the elastic sealing block and the fixed plate. The four guide shafts are respectively placed at the four corners of the connecting plate. The outer walls of the four guide shafts are slidably connected to the inner wall of the connecting plate.

10. A fireproof flat gate valve according to claim 9, characterized in that: Two spray boxes are symmetrically fixedly installed on the top of the valve body. The two spray boxes are respectively placed on one side of the valve handle. Spraying devices are fixedly installed inside the two spray boxes. Spray nozzles are fixedly installed on the outer walls of the two spraying devices. Multiple spray nozzles are placed around the top of the valve body.

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