Anti-burst self-locking flat gate valve

Abstract

The application provides an anti-burst self-locking flat gate valve and relates to the technical field of flat gate valves.The anti-burst self-locking flat gate valve comprises a main valve body, an inner lifting valve piece, inner sealing rings and sealing valve plates, the inner side of the main valve body is vertically slidably provided with the inner lifting valve piece, the middle part of the main valve body is provided with the inner sealing rings on both sides, the upper part of the inner lifting valve piece is provided with the sealing valve plates on both sides, the middle two sides of the main valve body are respectively and communicatively provided with an outflow pipe and an inflow pipe, the lower part of the main valve body is provided with a lower valve body chamber, the inner side of the lower valve body chamber is fixedly provided with a middle sealing sliding column, and the side of the main valve body is fixedly provided with an outer communication pipe.The inner lifting valve piece can press the liquid in the lower valve body chamber to flow outward to the outflow pipe through the outer communication pipe, the pressure of the outflow pipe is smaller than that of the inflow pipe, the resistance to the downward movement of the inner lifting valve piece is reduced, the liquid in the valve plate storage chamber is pressed outward when the valve plate is moved to be opened or closed, and the movement resistance of the valve plate is increased.

Description

Technical Field

[0001] This invention relates to the field of flat gate valve technology, and in particular to an explosion-proof self-locking flat gate valve. Background Technology

[0002] In the petroleum industry, explosion-proof self-locking flat gate valves are used in oil pipelines. These valves achieve pipeline closure by vertically lowering the valve plate, which has an internal plate-shaped structure. They also feature a self-locking function to ensure valve stability, prevent accidental leakage, effectively prevent safety accidents, and provide additional safety assurance.

[0003] The self-locking flat gate valve mainly achieves the closing and opening operations of the valve body through the vertical movement of the internal rectangular plate-shaped valve plate. Since the length of the valve plate is at least twice the diameter of the valve body's connecting channel, a corresponding valve plate storage chamber needs to be set in the upper or lower part of the valve body. If the valve plate storage chamber is kept sealed with the pipeline, there is a large pressure difference between the hollow valve plate storage chamber and the hydraulic fluid inside the valve body, which may lead to the valve body and valve plate bursting under pressure. If the valve plate drains the liquid into the valve plate storage chamber through the drainage hole to achieve pressure differential balance, the liquid inside the valve plate storage chamber needs to be forced outward when the valve plate moves to open or close. However, the liquid inside the valve body has a certain pressure, and the valve plate needs greater pressure to force the liquid inside the valve plate storage chamber into the valve body, which increases the movement resistance of the valve plate when opening and closing. Summary of the Invention

[0004] This disclosure relates to an explosion-proof self-locking flat gate valve. The central connecting hole, outlet pipe, and inlet pipe are aligned to achieve pipeline connection. The lower connecting hole and the central sealing slide are separated. Liquid flows through the lower connecting hole into the lower valve body chamber, filling it with liquid to balance the pressure difference between the lower valve body chamber and the central connecting hole. This prevents a sudden drop in pressure at the central connecting hole from causing a sudden descent of the inner lifting valve. The liquid inside the lower valve body chamber provides support for the inner lifting valve, thereby reducing the risk of explosion or leakage. When the inner lifting valve closes, it presses down, causing the liquid inside the lower valve body chamber to flow outward through the outer connecting pipe to the outlet pipe, releasing excess liquid and reducing liquid residue. As the inner lifting valve closes, the outlet pipe narrows, and the liquid inside also decreases. The pressure inside the outlet pipe is also lower than that on the inlet pipe side, preventing high backflow resistance of the liquid inside the lower valve body chamber into the outlet pipe, which would otherwise result in high resistance when the inner lifting valve closes.

[0005] In a first aspect, this disclosure provides an explosion-proof self-locking flat gate valve, specifically comprising: a main valve body, an inner lifting valve component, an inner sealing ring, and a sealing valve plate. The inner lifting valve component is vertically slidably disposed on the inner side of the main valve body. Inner sealing rings are disposed on both sides of the middle portion of the main valve body. Sealing valve plates are disposed on both sides of the upper portion of the inner lifting valve component. An outflow pipe and an inflow pipe are respectively connected to the middle two sides of the main valve body. A lower valve body chamber is disposed below the main valve body. A middle sealing slide is fixedly disposed on the inner side of the lower valve body chamber. An outer connecting pipe is fixedly disposed on the side of the main valve body.

[0006] Both sides of the main valve body are provided with side wedge-shaped limiting protrusions. The bottom of the lower valve body chamber is connected to the lower end of the external connecting pipe, and the upper end of the external connecting pipe is connected to the upper side of the outlet pipe. The liquid in the middle connecting hole flows into the lower valve body chamber through the lower through hole. Both sides of the inner lifting valve are provided with side limiting sliding grooves, and the lower valve body chamber is filled with liquid.

[0007] In at least some embodiments, the top of the inner lifting valve is fixedly provided with an upper threaded rod, the upper part of the upper threaded rod is screwed with an upper threaded tube, the lower part of the inner lifting valve is provided with a central connecting hole, the lower part of the inner lifting valve is provided with a lower through hole, and the upper part of the inner lifting valve is provided with an upper valve plate groove.

[0008] In at least some embodiments, the upper threaded pipe is rotatably connected to the upper part of the main valve body, the upper threaded rod is slidably connected to the upper part of the main valve body in a vertical axis and is sealed with a composite packing with a self-sealing ring structure, the upper end of the lower through hole is connected to the middle through hole, the inner lifting valve component will move down and press down the liquid inside the lower valve body cavity to flow outward to the outflow pipe through the outer through pipe, release excess liquid inside the lower valve body cavity, reduce liquid residue inside the lower valve body cavity, and reduce sediment inside the lower valve body cavity.

[0009] In at least some embodiments, the inner lifting valve and the inner side of the lower valve body cavity slide against each other, the lower through hole is located vertically above the middle sealing slide column, and when the lower through hole and the middle sealing slide column slide through each other, the lower through hole and the middle sealing slide column fit together and seal, and the middle sealing slide column realizes the disconnection of flow between the lower through hole and the lower valve body cavity.

[0010] In at least some embodiments, when the central connecting hole and the outlet and inlet pipes are aligned and connected, the lower connecting hole and the central sealing slide are separated. The lower end of the lower connecting hole is connected to the lower valve body chamber. The lower valve body chamber is connected to the central connecting hole through the lower connecting hole. The liquid in the central connecting hole flows into the lower valve body chamber through the lower connecting hole. The lower valve body chamber is filled with liquid, balancing the pressure difference between the lower valve body chamber and the central connecting hole. The liquid inside the lower valve body chamber provides certain support for the inner lifting valve component. At the same time, the liquid in the lower valve body chamber also flows to the outlet pipe through the outer connecting pipe to form a continuous flow path.

[0011] In at least some embodiments, the inner sealing ring is axially slidably connected to a rear sliding connecting ring, and a middle support spring is fixedly provided between the inner sealing ring and the rear sliding connecting ring. An inner annular groove is provided on the inner side of the first end of the inner sealing ring on the inflow pipe side. The middle support spring supports the inner sealing ring and the sealing valve plate and the inner lifting valve to keep them in contact. During the lifting and lowering process, the inner sealing ring cleans the residue on the surface of the inner lifting valve and the sealing valve plate, keeping the residue on the inner side of the inner sealing ring. The residue on the inner side of the inner sealing ring can be carried away with the liquid inside the outflow pipe and the inflow pipe.

[0012] In at least some embodiments, a central connecting slide is fixedly provided on the back of the sealing valve plate, and side connecting slide grooves are provided on both sides of the central connecting slide. The sealing valve plate and the central connecting slide are slidably disposed on both sides of the upper valve plate groove and are provided with sealing rings. The sealing valve plate and the center of the outflow pipe and the inflow pipe are aligned to achieve sealing.

[0013] In at least some embodiments, the side limiting slide groove and the side wedge-shaped limiting protrusion are vertically slidably connected, the side connecting slide grooves of the two middle connecting slides are slide groove structures that narrow from the bottom to the top, the side wedge-shaped limiting protrusion and the side connecting slide groove are vertically slidably connected, the inclined surface of the side wedge-shaped limiting protrusion and the inclined surface of the side connecting slide groove are in contact, and the side wedge-shaped limiting protrusion pushes the side connecting slide groove, the middle connecting slide and the sealing valve plate to move outward.

[0014] In at least some embodiments, the rear sliding connecting ring is fixedly disposed on one side of the first end of the outflow pipe and the inflow pipe. When the sealing valve plate is aligned with the center of the outflow pipe and the inflow pipe, the side wedge-shaped limiting protrusion is located at the upper part of the side connecting groove. The inclined surface of the side wedge-shaped limiting protrusion and the inclined surface of the side connecting groove are in contact. The side wedge-shaped limiting protrusion pushes the side connecting groove, the middle connecting slide and the sealing valve plate to move outward. The two middle connecting slides move away from each other. The sealing valve plate and the inner sealing ring are further sealed by the sealing ring.

[0015] This invention provides an explosion-proof self-locking flat gate valve, which has the following beneficial effects:

[0016] The central connecting hole and the outflow and inflow pipes are aligned to achieve pipeline connection. The lower connecting hole and the central sealing slide are separated. Liquid flows through the lower connecting hole into the lower valve body chamber. The lower valve body chamber is filled with liquid, balancing the pressure difference between the lower valve body chamber and the central connecting hole. This prevents the internal lifting valve from suddenly dropping due to a sudden pressure drop in the central connecting hole. The liquid inside the lower valve body chamber provides support for the internal lifting valve, thus avoiding the risk of explosion or leakage. The liquid in the lower valve body chamber also flows through the external connecting pipe to the outflow pipe, forming a continuous flow path and reducing the scouring of the internal lifting valve and the sealing valve plate by the fluid.

[0017] When the inner lifting valve moves down and closes, it presses down, causing the liquid inside the lower valve body chamber to flow outward through the external connecting pipe to the outlet pipe. This releases excess liquid from the lower valve body chamber, reducing liquid residue. As the inner lifting valve closes, the outlet pipe narrows, and the amount of liquid inside also decreases. The pressure inside the outlet pipe is also lower than that on the inlet pipe side. This prevents the backflow resistance of liquid from the lower valve body chamber into the outlet pipe from being too high, which would otherwise result in high resistance when the inner lifting valve moves down and closes. This reduces the resistance when the inner lifting valve moves down and closes, as well as the force required for control operation, and reduces the torque requirements for personnel or drive motors.

[0018] During the downward movement of the internal lifting valve, the lower through hole moves downward and the middle sealing slide is in a sliding state. The middle sealing slide achieves the disconnection of the flow between the lower through hole and the lower valve body chamber, preventing the liquid from continuously flowing into the lower valve body chamber when the valve is closed. This cuts off the liquid flow between the lower valve body chamber and the middle connecting hole, reducing the possibility of liquid flowing back from the outlet pipe to the middle connecting hole.

[0019] The pressure of the liquid can drive the inner annular groove and the inner sealing ring to move and fit against the sealing valve plate. The flow pressure of the liquid further improves the sealing effect between the sealing valve plate and the inner sealing ring. The movement and compression of the middle support spring between the inner sealing ring and the rear sliding connecting ring can also adapt to and compensate for the deformation of the sealing surface caused by temperature. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0021] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0022] In the attached diagram:

[0023] Figure 1 A schematic diagram of the overall structure of this application is shown;

[0024] Figure 2 A schematic diagram of the cross-sectional structure of the main valve body of this application is shown;

[0025] Figure 3 A schematic diagram of the lower valve body chamber structure of this application is shown;

[0026] Figure 4 A schematic diagram of the internal lifting valve structure of this application is shown;

[0027] Figure 5 A schematic diagram of the upper valve plate groove of this application is shown;

[0028] Figure 6 This invention provides a schematic diagram of the internal lifting valve in its lowered, closed state.

[0029] Figure 7 A cross-sectional structural schematic diagram of the external connecting pipe of this application is shown;

[0030] Figure 8 This paper shows a schematic diagram of the sliding fit between the side wedge-shaped limiting protrusion and the side limiting groove of this application.

[0031] Figure 9 A schematic diagram of the structure of the inner sealing ring of this application is shown;

[0032] List of reference numerals

[0033] 1. Main valve body; 101. Outlet pipe; 102. Inlet pipe; 103. Lower valve body chamber; 104. Middle sealing slide; 105. External connecting pipe; 106. Side wedge-shaped limiting protrusion;

[0034] 2. Internal lifting valve component; 201. Upper threaded rod; 202. Upper threaded pipe; 203. Central connecting hole; 204. Lower through hole; 205. Side limiting slide groove; 206. Upper valve plate groove;

[0035] 3. Inner sealing ring; 301. Middle support spring; 302. Rear sliding connecting ring; 303. Inner annular groove;

[0036] 4. Sealing valve plate; 401. Middle connecting slide; 402. Side connecting slide groove. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figures 1 to 9 :

[0039] This invention proposes an explosion-proof self-locking flat gate valve, comprising: a main valve body 1, an inner lifting valve component 2, an inner sealing ring 3, and a sealing valve plate 4. An outflow pipe 101 and an inflow pipe 102 are respectively connected to the two sides of the main valve body 1. A lower valve body chamber 103 is provided below the main valve body 1. A central sealing slide 104 is fixedly installed inside the lower valve body chamber 103. An external connecting pipe 105 is fixedly installed on the side of the main valve body 1. Side wedge-shaped limiting protrusions 106 protrude from both sides of the interior of the main valve body 1. The bottom of the lower valve body chamber 103 is connected to the lower end of the external connecting pipe 105, and the upper end of the external connecting pipe 105 is connected to the upper side of the outflow pipe 101. A central connecting hole 20... The liquid in 3 flows into the lower valve body chamber 103 through the lower through hole 204. The lower valve body chamber 103 is filled with liquid to balance the pressure difference between the lower valve body chamber 103 and the middle connecting hole 203. An inner lifting valve component 2 is vertically slidably arranged on the inner side of the main valve body 1. An upper threaded rod 201 is fixedly arranged on the top of the inner lifting valve component 2. An upper threaded pipe 202 is screwed to the upper part of the upper threaded rod 201. A middle connecting hole 203 is provided through the lower part of the inner lifting valve component 2. A lower through hole 204 is provided in the lower part of the middle connecting hole 203. Side limiting slide grooves 205 are opened on both sides of the inner lifting valve component 2. An upper valve plate groove 206 is provided in the upper part of the inner lifting valve component 2.

[0040] An inner sealing ring 3 is provided on both sides of the middle part of the main valve body 1. The inner sealing ring 3 is axially slidably connected to a rear sliding connecting ring 302. A middle support spring 301 is fixedly provided between the inner sealing ring 3 and the rear sliding connecting ring 302. An inner annular groove 303 is provided on the inner side of the first end of the inner sealing ring 3 on one side of the inflow pipe 102. The middle support spring 301 supports the inner sealing ring 3, the sealing valve plate 4, and the inner lifting valve 2 to keep them in contact. During the lifting process, the inner sealing ring 3 cleans the residue on the surface of the inner lifting valve 2 and the sealing valve plate 4, keeping the residue inside the inner sealing ring 3. The residue inside the inner sealing ring 3 can be carried away with the liquid inside the outflow pipe 101 and the inflow pipe 102. A sealing valve plate 4 is provided on both sides of the upper part of the inner lifting valve 2. A middle connecting slide 40 is fixedly provided on the back of the sealing valve plate 4. 1. Side connecting slides 402 are provided on both sides of the middle connecting slide 401. The sealing valve plate 4 and the middle connecting slide 401 are slidably disposed on both sides of the upper valve plate groove 206 and are provided with sealing rings. The sealing valve plate 4 is aligned with the center of the outflow pipe 101 and the inflow pipe 102 to achieve closure. The sealing valve plate 4 and the inner sealing ring 3 are fitted together to achieve sealing. The side limiting slide 205 and the side wedge-shaped limiting protrusion 106 are vertically slidably connected. The side connecting slides 402 of the two middle connecting slides 401 have a slide structure that narrows from the bottom to the top. The side wedge-shaped limiting protrusion 106 and the side connecting slide 402 are vertically slidably connected. The inclined surface of the side wedge-shaped limiting protrusion 106 is fitted with the inclined surface of the side connecting slide 402. The side wedge-shaped limiting protrusion 106 pushes the side connecting slide 402, the middle connecting slide 401 and the sealing valve plate 4 to move outward.

[0041] In the embodiments disclosed herein, as shown in the appendix Figure 1 , 2 As shown in Figure 6, the upper threaded pipe 202 is rotatably connected to the upper part of the main valve body 1, and the upper threaded rod 201 is slidably connected to the upper part of the main valve body 1 in a vertical axis and is sealed with a composite packing with a self-sealing ring structure. The upper end of the lower through hole 204 is connected to the middle through hole 203. The inner lifting valve component 2 will move down and press down the liquid inside the lower valve body chamber 103 to flow outward to the outlet pipe 101 through the outer through pipe 105, draining excess liquid inside the lower valve body chamber 103 and reducing liquid residue inside the lower valve body chamber 103. At the same time, each time it is opened, the liquid inside the lower valve body chamber 103 can be refilled to flush the inside of the lower valve body chamber 103 and reduce the sediment inside the lower valve body chamber 103.

[0042] In the embodiments disclosed herein, as shown in the appendix Figure 1 , 2 As shown in Figures 3, 6, and 7, the inner lifting valve 2 and the inner side of the lower valve body chamber 103 slide against each other. The lower through hole 204 is located vertically above the middle sealing slide column 104. When the lower through hole 204 and the middle sealing slide column 104 slide through each other, the lower through hole 204 and the middle sealing slide column 104 are fitted and sealed. The middle sealing slide column 104 realizes the disconnection of the flow between the lower through hole 204 and the lower valve body chamber 103, avoiding the continuous flow of liquid in the middle through hole 203 through the lower through hole 204 into the lower valve body chamber 103 during the closing and downward movement of the inner lifting valve 2. It also reduces the situation where liquid flows back from the outlet pipe 101 to the middle through hole 203, and reduces the resistance when the inner lifting valve 2 moves downward and closes.

[0043] In the embodiments disclosed herein, as shown in the appendix Figure 1 , 2 As shown in Figures 3, 6, and 7, when the central connecting hole 203 is aligned and connected with the outlet pipe 101 and the inlet pipe 102, the lower connecting hole 204 and the central sealing slide 104 are separated. The lower end of the lower connecting hole 204 remains connected to the lower valve body chamber 103. The lower valve body chamber 103 is connected to the central connecting hole 203 through the lower connecting hole 204. The liquid in the central connecting hole 203 flows into the lower valve body chamber 103 through the lower connecting hole 204, filling the lower valve body chamber 103 with liquid and balancing the lower valve body chamber 103. The pressure difference between the 3rd and the central connecting hole 203 allows the liquid inside the lower valve body chamber 103 to provide certain support for the inner lifting valve 2, preventing a sudden drop in pressure in the central connecting hole 203 that could cause the inner lifting valve 2 to drop suddenly, thus avoiding the risk of explosion or leakage. At the same time, the liquid in the lower valve body chamber 103 also flows through the external connecting pipe 105 to the outlet pipe 101 to form a continuous flow path, reducing the scouring of the fluid on the inner lifting valve 2 and the sealing valve plate 4, and extending the service life of the inner lifting valve 2 and the sealing valve plate 4.

[0044] In the embodiments disclosed herein, as shown in the appendix Figure 3 , 4 As shown in Figures 5 and 8, the rear sliding connecting ring 302 is fixedly installed on one side of the first end of the outflow pipe 101 and the inflow pipe 102. When the sealing valve plate 4 is aligned with the center of the outflow pipe 101 and the inflow pipe 102, the side wedge-shaped limiting protrusion 106 is located at the upper part of the side connecting groove 402. The inclined surface of the side wedge-shaped limiting protrusion 106 is in contact with the inclined surface of the side connecting groove 402. The side wedge-shaped limiting protrusion 106 pushes the side connecting groove 402, the middle connecting slide 401 and the sealing valve plate 4 to move outward. The two middle connecting slides 401 move away from each other. The sealing valve plate 4 and the inner sealing ring 3 are further sealed by the sealing ring. The displacement of the sealing valve plate 4 compensates for the deformation of the sealing surface caused by temperature and adapts to temperature changes.

[0045] In Example 2, based on Example 1, a one-way valve is installed at the positions of the external connecting pipe 105 and the outflow pipe 101 to prevent the liquid inside the outflow pipe 101 from returning to the lower valve body chamber 103 along the external connecting pipe 105. The sealing valve plate 4 and the middle connecting slide 401 are axially slidably connected. The sealing valve plate 4 and the middle connecting slide 401 are provided with a spiral support spring. The middle connecting slide 401 simultaneously compresses the sealing valve plate 4 by pressing the spiral support spring to move and fit against the inner sealing ring 3 to achieve sealing.

[0046] The working principle of this embodiment is as follows: The outflow pipe 101 and the inflow pipe 102 are connected and fixed to the external transport pipeline through flanges and bolts. A tightening screw is provided on the upper part of the main valve body 1. The tightening screw tightens the upper threaded pipe 202, realizing the tightening operation of the upper threaded pipe 202 when not in use. In the closed state, the tightening screw realizes the self-locking of the upper threaded pipe 202, realizing the locking of the position of the inner lifting valve 2, preventing the valve from being accidentally opened due to misoperation or external interference, thereby increasing safety. When the upper threaded pipe 202 rotates, the thread of the upper threaded pipe 202 guides the upper threaded rod 201 to move axially. The upper threaded rod 201 and the inner lifting valve 2 move vertically in sync inside the main valve body 1. The up and down movement of the inner lifting valve 2 realizes the switching operation of disconnection and connection. When the inner lifting valve 2 moves upward, the central connecting hole 203 aligns with the outflow pipe 101 and the inflow pipe 102, realizing the connection operation of the outflow pipe 101, the inflow pipe 102 and the pipeline. During operation, the inner lifting valve 2, the middle connecting hole 203, and the lower connecting hole 204 simultaneously move upwards. The lower connecting hole 204 moves upwards along the middle sealing slide 104. When the middle connecting hole 203 is aligned with the center of the outflow pipe 101 and the inflow pipe 102, the lower connecting hole 204 and the middle sealing slide 104 separate and maintain a certain distance. The liquid in the middle connecting hole 203 flows through the lower connecting hole 204 into the lower valve body chamber 103. The lower valve body chamber 103 is filled with liquid, balancing the lower valve body chamber 103 and the middle connecting hole. The pressure difference of 203 allows the liquid inside the lower valve body chamber 103 to provide certain support for the inner lifting valve 2, preventing the inner lifting valve 2 from suddenly dropping due to a sudden drop in pressure in the middle connecting hole 203, thereby avoiding the risk of explosion or leakage. At the same time, the liquid in the lower valve body chamber 103 also flows through the outer connecting pipe 105 to the outlet pipe 101 to form a continuous flow path, reducing the scouring of the fluid on the inner lifting valve 2 and the sealing valve plate 4, and extending the service life of the inner lifting valve 2, the sealing valve plate 4, and other related seals.

[0047] The upper threaded pipe 202 rotates, and the thread of the upper threaded pipe 202 guides the upper threaded rod 201 to move vertically downward axially. The upper threaded rod 201 and the inner lifting valve 2 move vertically downward synchronously inside the main valve body 1. When the inner lifting valve 2 moves down and closes, it moves into the lower valve body chamber 103. The inner lifting valve 2 will move down and press down, causing the liquid inside the lower valve body chamber 103 to flow outward through the external connecting pipe 105 to the outlet pipe 101, thus draining out of the lower valve body. Excess liquid inside chamber 103 is reduced, minimizing liquid residue within the lower valve body chamber 103. Simultaneously, each opening cycle refills the lower valve body chamber 103 with liquid, flushing it and reducing sediment buildup. This prevents liquid from flowing along the valve plate channel into the outlet pipe 101 when the valve is closed, as the pressurized outlet pipe 101 creates significant backflow resistance, thus preventing internal rise. In cases where the resistance is high when the lowering valve 2 moves down to close, this device guides the liquid to the outlet pipe 101 through the external connecting pipe 105. During the closing process of the inner lifting valve 2, the internal pressure of the outlet pipe 101 also decreases. The pressure of the outlet pipe 101 is smaller than that of the inlet pipe 102, and the resistance of the inner lifting valve 2 moving down is also smaller. This reduces the resistance when the inner lifting valve 2 moves down to close and the force required for operation by the controller or the drive motor, as well as the torque requirements for the controller or the drive motor. The tail end of the external connecting pipe 105 is connected to the upper part of the outlet pipe 101. As the inner lifting valve 2 closes, the outlet pipe 101 becomes smaller, and the liquid inside also decreases. The pressure inside the outlet pipe 101 is also smaller than that of the inlet pipe 102, reducing the reaction force pressure of the liquid inside the outlet pipe 101 on the external connecting pipe 105. Compared to the situation where the bottom end of the external connecting pipe 105 is connected to the upper part of the outlet pipe 101, it avoids additional pressure such as gravity, and the pressure it receives is relatively smaller.

[0048] As the inner lifting valve 2 moves downward, the lower through hole 204 moves downward close to the middle sealing slide 104 and slides in. With the lower through hole 204 moving downward and the middle sealing slide 104 in a sliding state, the middle sealing slide 104 is positioned inside the lower through hole 204, blocking and sealing it. The middle sealing slide 104 disconnects the flow between the lower through hole 204 and the lower valve body chamber 103, preventing the liquid in the middle connecting hole 203 from continuously flowing into the lower valve body chamber 103 through the lower through hole 204 during the closing movement. This cuts off the liquid flow between the lower valve body chamber 103 and the middle connecting hole 203, and also reduces the backflow of liquid from the outlet pipe 101 into the middle connecting hole 203. In this situation, the resistance of the inner lifting valve 2 when it moves downward to close is reduced; the inner lifting valve 2 and the sealing valve plate 4 move downward synchronously, and the inner lifting valve 2 and the sealing valve plate 4 gradually narrow and close the inflow pipe 102 and the outflow pipe 101. The sealing valve plate 4 is aligned with the center of the outflow pipe 101 and the inflow pipe 102 to achieve closure. The sealing valve plate 4 and the inner sealing ring 3 are in contact to achieve sealing. The side limiting slide groove 205 and the side wedge-shaped limiting protrusion 106 of the inner lifting valve 2 slide to move downward in the vertical direction. The side connecting slide groove 402 and the side limiting slide groove 205 are connected and simultaneously slide with the side wedge-shaped limiting protrusion 106. The side wedge-shaped limiting protrusion 106 slides to the upper part of the side connecting slide groove 402. When the slope of the narrowing position is reached, the slope of the side wedge-shaped limiting protrusion 106 and the slope of the side connecting groove 402 are in contact. The side wedge-shaped limiting protrusion 106 pushes the side connecting groove 402, the middle connecting slide 401, and the sealing valve plate 4 to move outward. The sealing valve plate 4 moves further closer to the inner sealing ring 3 to increase the sealing force. The inner sealing ring 3 is provided with a rubber sealing ring on the side close to the sealing valve plate 4. The displacement of the sealing valve plate 4 compensates for the deformation of the sealing surface caused by temperature and adapts to temperature changes. The middle support spring 301 supports the inner sealing ring 3 to keep it in contact with the surface of the inner lifting valve 2 and the sealing valve plate 4. During the lifting process, the inner sealing ring 3... The residue is cleaned up and kept inside the inner sealing ring 3. The residue inside the inner sealing ring 3 can be carried away by the liquid inside the outflow pipe 101 and inflow pipe 102. The inner sealing ring 3 and the rear sliding connecting ring 302 are compressed by the movement of the centering support spring 301. The change in distance between the inner sealing ring 3 and the rear sliding connecting ring 302 can also adapt to and compensate for the deformation of the sealing surface caused by temperature. The inner annular groove 303 and the liquid contact surface, the flow and pressure of the liquid can drive the inner annular groove 303 and the inner sealing ring 3 to move and fit against the sealing valve plate 4. The flow pressure of the liquid further improves the sealing effect between the sealing valve plate 4 and the inner sealing ring 3.

[0049] The following points should be noted in this article:

[0050] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0051] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0052] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An explosion-proof self-locking flat gate valve, comprising: The main valve body (1), inner lifting valve (2), inner sealing ring (3), and sealing valve plate (4) are characterized in that an inner lifting valve (2) is vertically slidably arranged on the inner side of the main valve body (1), an inner sealing ring (3) is arranged on both sides of the middle part of the main valve body (1), a sealing valve plate (4) is arranged on both sides of the upper part of the inner lifting valve (2), an outflow pipe (101) and an inflow pipe (102) are respectively connected on both sides of the middle part of the main valve body (1), a lower valve body chamber (103) is arranged below the main valve body (1), a middle sealing slide column (104) is fixedly arranged on the inner side of the lower valve body chamber (103), an outer connecting pipe (105) is fixedly arranged on the side of the main valve body (1), a side wedge-shaped limiting protrusion (106) is protruding on both sides of the interior of the main valve body (1), the bottom of the lower valve body chamber (103) and the lower end of the outer connecting pipe (105) are connected, and the upper part of the outer connecting pipe (105) is connected to the lower end of the outer connecting pipe (105). The upper side of the outlet pipe (101) is connected to the end. The top of the inner lifting valve (2) is fixedly provided with an upper threaded rod (201). The upper part of the upper threaded rod (201) is screwed with an upper threaded pipe (202). The lower part of the inner lifting valve (2) is provided with a central connecting hole (203). The inner lifting valve (2) is provided with a lower through hole (204) at the lower part of the central connecting hole (203). The inner lifting valve (2) is provided with side limiting grooves on both sides. 205), the upper part of the inner lifting valve component (2) is provided with an upper valve plate groove (206). When the center of the middle connecting hole (203) and the outlet pipe (101) and the inlet pipe (102) are aligned and connected, the lower through hole (204) and the middle sealing slide (104) are in a separated state. The lower end of the lower through hole (204) and the lower valve body chamber (103) are kept connected. The lower valve body chamber (103) is connected to the middle connecting hole (203) through the lower through hole (204).

2. The explosion-proof self-locking flat gate valve according to claim 1, characterized in that, The upper threaded tube (202) is rotatably connected to the upper part of the main valve body (1), the upper threaded rod (201) is slidably connected to the upper part of the main valve body (1) in a vertical axis, and the upper end of the lower through hole (204) is connected to the middle through hole (203).

3. The explosion-proof self-locking flat gate valve according to claim 2, characterized in that, The inner lifting valve (2) and the inner side of the lower valve body chamber (103) slide against each other. The lower through hole (204) is located vertically above the middle sealing slide (104). When the lower through hole (204) and the middle sealing slide (104) slide through each other, the lower through hole (204) and the middle sealing slide (104) fit and seal each other.

4. The explosion-proof self-locking flat gate valve according to claim 1, characterized in that, The inner sealing ring (3) is axially slidably connected to a rear sliding connecting ring (302). A middle support spring (301) is fixedly provided between the inner sealing ring (3) and the rear sliding connecting ring (302). An inner annular groove (303) is provided on the inner side of the first end of the inner sealing ring (3). The middle support spring (301) supports the inner sealing ring (3) and the sealing valve plate (4) and the inner lifting valve (2) to keep them in contact.

5. The explosion-proof self-locking flat gate valve according to claim 4, characterized in that, The sealing valve plate (4) is fixedly provided with a middle connecting slide (401) on its back. Both sides of the middle connecting slide (401) are provided with side connecting slide grooves (402). The sealing valve plate (4) and the middle connecting slide (401) are slidably arranged on both sides of the upper valve plate groove (206).

6. The explosion-proof self-locking flat gate valve according to claim 5, characterized in that, The side limiting groove (205) and the side wedge-shaped limiting protrusion (106) are vertically slidably connected. The side connecting groove (402) of the two middle connecting slides (401) is a groove structure that narrows from the bottom to the top. The side wedge-shaped limiting protrusion (106) and the side connecting groove (402) are vertically slidably connected.

7. The explosion-proof self-locking flat gate valve according to claim 6, characterized in that, The rear sliding connecting ring (302) is fixedly installed on one side of the first end of the outflow pipe (101) and the inflow pipe (102). When the sealing valve plate (4) and the center of the outflow pipe (101) and the inflow pipe (102) are aligned, the side wedge-shaped limiting protrusion (106) is located at the upper part of the side connecting slide groove (402), and the two middle connecting slides (401) move away from each other, and the sealing valve plate (4) and the inner sealing ring (3) are further fitted and sealed.

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