Anti-burst self-locking flat gate valve

Abstract

The invention 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 lifting valve piece is vertically and slidably arranged on the inner side of the main valve body, the inner sealing rings are arranged on the two sides of the middle of the main valve body, and the sealing valve plates are arranged on the two sides of the upper portion of the inner lifting valve piece; an outflow pipe and an inflow pipe are arranged on the two middle sides of the main valve body in a communicating mode respectively, a lower valve body cavity is formed below the main valve body, a middle sealing sliding column is fixedly arranged on the inner side of the lower valve body cavity, and an outer communicating pipe is fixedly arranged on the side face of the main valve body. When the valve plate moves to be opened or closed, the inner lifting valve piece presses liquid in the valve body cavity downwards to flow outwards to the outflow pipe towards the outer communicating pipe, the pressure of the outflow pipe is smaller than that of one side of the inflow pipe, the situation that resistance of downward movement of the inner lifting valve piece is increased is reduced, and the problem that when the valve plate moves to be opened or closed, liquid in the valve plate storage cavity needs to be pressed outwards, and the valve plate is damaged is solved. And the moving resistance of the valve plate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of flat gate valves, and in particular to an anti-explosion self-locking flat gate valve. Background Art

[0002] In the oil industry, anti-burst self-locking flat gate valves are used in oil pipelines, etc. The anti-burst self-locking flat gate valve mainly realizes the closing operation of the pipeline by the vertical drop of the valve plate with an internal plate-shaped structure. The anti-burst self-locking flat gate valve also provides additional safety protection by setting a self-locking function to ensure the stability of the valve, prevent accidental leakage, effectively prevent safety accidents, and provide additional safety protection.

[0003] The self-locking flat gate valve mainly realizes 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 connecting channel, a corresponding valve plate storage chamber needs to be provided at the upper or lower part of the valve body. If the valve plate storage chamber is sealed with the pipeline, there is a large pressure difference between the hydraulic pressure inside the hollow valve plate storage chamber and the internal hydraulic pressure of the valve body, resulting in a certain probability of bursting of the valve body and the valve plate under pressure. If the valve plate drains the liquid into the valve plate storage chamber through the drainage hole to achieve pressure difference balance, when the valve plate moves to open or close, the liquid inside the valve plate storage chamber needs to be pressed out, and the liquid inside the valve body has a certain pressure. The valve plate needs a greater pressure to press 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] The disclosed embodiment relates to an explosion-proof self-locking flat gate valve, in which a middle communicating hole is aligned with an outflow pipe and an inflow pipe to realize the connecting operation of the pipelines, a lower through hole and a middle sealing sliding column are in a separated state, liquid flows into the lower valve body chamber through the lower through hole, the interior of the lower valve body chamber is filled with liquid, and the pressure difference between the lower valve body chamber and the middle communicating hole is balanced, so as to avoid a sudden drop in the pressure of the middle communicating hole causing a sudden drop in the inner lifting valve member, and the liquid inside the lower valve body chamber provides support for the inner lifting valve member, thereby reducing the risk of explosion or leakage, and when the inner lifting valve member moves downward and closes, the inner lifting valve member presses the liquid inside the lower valve body chamber downward toward the outer connecting pipe to flow outward to the outflow pipe, discharges the excess liquid inside the lower valve body chamber, and reduces the residual liquid inside the lower valve body chamber, and as the inner lifting valve member is closed, the outflow pipe becomes smaller, and the liquid inside also becomes less, and the pressure inside the outflow pipe will also be smaller than the inflow pipe side, so as to avoid a large resistance of the liquid inside the lower valve body chamber to flow back to the inside of the outflow pipe, resulting in a large resistance when the inner lifting valve member moves downward and closes.

[0005] In a first aspect of the present disclosure, an explosion-proof self-locking flat gate valve is provided, which specifically includes: a main valve body, an inner lifting valve member, an inner sealing ring and a sealing valve plate, wherein the inner side of the main valve body is vertically slidably provided with an inner lifting valve member, both sides of the middle part of the main valve body are provided with inner sealing rings, both sides of the upper part of the inner lifting valve member are provided with sealing valve plates, the middle sides of the main valve body are respectively connected with an outflow pipe and an inflow pipe, a lower valve body chamber is provided below the main valve body, a middle sealing sliding column is fixedly provided on the inner side of the lower valve body chamber, and an external connecting pipe is fixedly provided on the side of the main valve body.

[0006] Side wedge-shaped limit bumps are protruding on both sides of the interior of the main valve body, the bottom of the lower valve body chamber is connected to the lower end of the external connecting pipe, the upper end of the external connecting pipe is connected to the upper side of the outflow pipe, the liquid in the middle connecting hole flows into the lower valve body chamber through the lower through hole, side limit slide grooves are provided on both sides of the internal lifting valve member, and the interior of the lower valve body chamber is filled with liquid.

[0007] In at least some embodiments, an upper threaded rod is fixedly provided on the top of the internal lifting valve component, an upper threaded tube is screwed onto the upper part of the upper threaded rod, a middle connecting hole is penetrated through the lower part of the internal lifting valve component, a lower through hole is provided at the lower part of the middle connecting hole of the internal lifting valve component, and an upper valve plate groove is provided on the upper part of the internal lifting valve component.

[0008] In at least some embodiments, the upper threaded tube is rotatably connected to the upper portion of the main valve body, the upper threaded rod is vertically axially slidably connected to the upper portion of the main valve body and is provided with a composite filler with a self-sealing ring structure for sealing, the upper end of the lower through hole is connected to the middle connecting hole, the internal lifting valve member will move downward and press the liquid inside the lower valve body chamber to flow outward toward the external connecting tube to the outflow pipe, thereby discharging excess liquid inside the lower valve body chamber, reducing liquid residue inside the lower valve body chamber, and reducing sediment inside the lower valve body chamber.

[0009] In at least some embodiments, the inner lifting valve member and the inner side surface of the lower valve body chamber are slidably fitted, and the lower through hole is located vertically above the middle sealing slide column. When the lower through hole and the middle sealing slide column slide through, the lower through hole and the middle sealing slide column are fitted and sealed, and the middle sealing slide column realizes the disconnection of the flow between the lower through hole and the lower valve body chamber.

[0010] In at least some embodiments, when the middle connecting hole and the outflow pipe and the inflow pipe are aligned and connected, the lower through hole and the middle sealing sliding column are in a separated state, and the lower end of the lower through hole and the lower valve body chamber remain connected. The lower valve body chamber is connected to the middle connecting hole through the lower through hole, and the liquid in the middle connecting hole flows into the lower valve body chamber through the lower through hole. The interior of the lower valve body chamber is filled with liquid to balance the pressure difference between the lower valve body chamber and the middle connecting hole. The liquid inside the lower valve body chamber provides certain support for the internal lifting valve member. At the same time, the liquid in the lower valve body chamber also flows to the outflow pipe through the external connecting pipe to form a continuous flow path.

[0011] In at least some embodiments, the inner sealing ring is axially slidably connected with a rear sliding connecting ring, a middle supporting elastic member is fixedly arranged between the inner sealing ring and the rear sliding connecting ring, an inner annular groove is concavely arranged on the inner side of the head end of the inner sealing ring on the inlet pipe side, the middle supporting elastic member supports the inner sealing ring and the sealing valve plate and the inner lifting valve member to maintain fit, and the inner sealing ring cleans the residues on the surface of the inner lifting valve member and the sealing valve plate during the lifting process, and keeps the residues on the inner side of the inner sealing ring, and the residues 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 middle 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 middle connecting slide. The sealing valve plate and the middle connecting slide are slidingly provided on both sides of the upper valve plate groove and are provided with sealing rings. The sealing valve plate and the centers of the outflow pipe and the inflow pipe are aligned to achieve closure.

[0013] In at least some embodiments, the side limiting groove and the side wedge-shaped limiting protrusion are vertically slidably connected, the side connecting grooves of the two middle connecting slides are a groove structure narrowing from bottom to top, the side wedge-shaped limiting protrusion and the side connecting groove are vertically slidably connected, the inclined surface of the side wedge-shaped limiting protrusion fits with the inclined surface of the side connecting groove, and the side wedge-shaped limiting protrusion pushes the side connecting groove, the middle connecting slide and the sealing valve plate to move toward the outside.

[0014] In at least some embodiments, the rear sliding connecting ring is fixedly arranged on one side of the head end of the outflow pipe and the inflow pipe, and when the sealing valve plate and the centers of the outflow pipe and the inflow pipe are aligned, the side wedge-shaped limiting protrusion is located at the upper part of the side connecting slide groove, and the inclined surface of the side wedge-shaped limiting protrusion fits with the inclined surface of the side connecting slide groove, and the side wedge-shaped limiting protrusion pushes the side connecting slide groove, the middle connecting slide and the sealing valve plate to move toward the outside, and the two middle connecting slides move away from each other, and the sealing valve plate and the inner sealing ring are further fitted and sealed through the sealing ring.

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

[0016] The middle connecting hole and the outflow pipe and the inflow pipe are aligned to realize the connecting operation of the pipeline. The lower through hole and the middle sealing slide are in a separated state. The liquid flows into the lower valve body chamber through the lower through hole. The interior of the lower valve body chamber is filled with liquid, which balances the pressure difference between the lower valve body chamber and the middle connecting hole, and avoids the sudden drop of the internal lifting valve member caused by the sudden drop of the pressure in the middle connecting hole. The liquid inside the lower valve body chamber provides support for the internal lifting valve member, thereby avoiding the risk of explosion or leakage. The liquid in the lower valve body chamber also flows to the outflow pipe through the external connecting pipe to form a continuous flow path, reducing the scouring of the internal lifting valve member and the sealing valve plate by the fluid.

[0017] When the inner lift valve member moves down and closes, the inner lift valve member will press the liquid inside the lower valve body chamber toward the external connecting pipe and outward to the outflow pipe, thereby discharging excess liquid inside the lower valve body chamber and reducing residual liquid inside the lower valve body chamber. As the inner lift valve member is closed, the outflow pipe becomes smaller and the liquid inside also becomes less. The pressure inside the outflow pipe will also be smaller than the inflow pipe side, thereby avoiding the situation where the liquid inside the lower valve body chamber has a large resistance to flow back toward the outflow pipe, resulting in a large resistance when the inner lift valve member moves down and closes, reducing the resistance when the inner lift valve member moves down and closes and the force requirement for control operation, and reducing the torque requirement for personnel or drive motors.

[0018] When the inner lifting valve member moves downward, the lower through hole moves downward and the middle sealing slide column slides into the state, and the middle sealing slide column realizes the disconnection operation between the lower through hole and the lower valve body chamber, avoiding the liquid from continuously flowing into the lower valve body chamber during the closing movement, cutting off the liquid flow between the lower valve body chamber and the middle connecting hole, and reducing the situation where the liquid flows back from the outflow 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 the sealing valve plate. The flow pressure of the liquid further enhances the sealing effect between the sealing valve plate and the inner sealing ring. The movement and compression of the middle supporting elastic part 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

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

[0022] In the attached picture:

[0023] Figure 1 A schematic diagram showing the overall structure of the present application;

[0024] Figure 2 A schematic diagram showing the cross-sectional structure of the main valve body of the present application;

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

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

[0027] Figure 5 The schematic diagram of the structure of the upper valve plate slot of the present application is shown;

[0028] Figure 6 It shows a structural schematic diagram of the inner lifting valve member of the present application in a downwardly moved closed state;

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

[0030] Figure 8 A schematic diagram showing the structure of the side wedge-shaped limiting protrusion and the side limiting sliding groove in the present application in a sliding matching state;

[0031] Fig. 9 A schematic structural diagram of the inner sealing ring of the present application is shown;

[0032] Reference numerals list

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

[0034] 2. Internal lifting valve member; 201. Upper threaded rod; 202. Upper threaded tube; 203. Middle connecting hole; 204. Lower through hole; 205. Side limit slide groove; 206. Upper valve plate groove;

[0035] 3. Inner sealing ring; 301. Middle supporting elastic member; 302. Rear sliding connecting ring; 303. Inner annular groove;

[0036] 4. Sealing valve plate; 401. Middle connecting slide; 402. Side connecting slide. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

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

[0039] The present invention proposes an anti-burst self-locking flat gate valve, comprising: a main valve body 1, an inner lifting valve member 2, an inner sealing ring 3 and a sealing valve plate 4, the middle two sides of the main valve body 1 are respectively connected with an outflow pipe 101 and an inflow pipe 102, a lower valve body chamber 103 is arranged below the main valve body 1, a middle sealing sliding column 104 is fixedly arranged on the inner side of the lower valve body chamber 103, an external connecting pipe 105 is fixedly arranged on the side of the main valve body 1, side wedge-shaped limiting protrusions 106 are protruding on both sides of the interior of the main valve body 1, the bottom of the lower valve body chamber 103 is connected with the lower end of the external connecting pipe 105, the upper end of the external connecting pipe 105 is connected with the upper side of the outflow pipe 101, and the middle connecting hole 20 The liquid in 3 flows into the lower valve body chamber 103 through the lower through hole 204, and 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. The inner side of the main valve body 1 is vertically slidably provided with an inner lift valve member 2, the top of the inner lift valve member 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 tube 202, the lower part of the inner lift valve member 2 is penetrated with a middle connecting hole 203, the inner lift valve member 2 is provided with a lower through hole 204 at the lower part of the middle connecting hole 203, both sides of the inner lift valve member 2 are provided with side limit sliding grooves 205, and the upper part of the inner lift valve member 2 is provided with an upper valve plate groove 206;

[0040] Inner sealing rings 3 are provided on both sides of the middle part of the main valve body 1, and the inner sealing ring 3 is axially slidably connected with a rear sliding connecting ring 302, and a middle supporting elastic member 301 is fixedly provided between the inner sealing ring 3 and the rear sliding connecting ring 302, and an inner annular groove 303 is concavely provided on the inner side of the head end of the inner sealing ring 3 on the side of the inflow pipe 102, and the middle supporting elastic member 301 supports the inner sealing ring 3 and the sealing valve plate 4 and the inner lifting valve member 2 to keep them in contact, and the inner sealing ring 3 cleans the residues on the surfaces of the inner lifting valve member 2 and the sealing valve plate 4 during the lifting process, and keeps the residues on the inner side of the inner sealing ring 3, and the residues on the inner side of the inner sealing ring 3 can be taken away with the liquid inside the outflow pipe 101 and the inflow pipe 102, and sealing valve plates 4 are provided on both sides of the upper part of the inner lifting valve member 2, and a middle connecting slide 40 is fixedly provided on the back of the sealing valve plate 4 1. Side connecting grooves 402 are arranged on both sides of the middle connecting slide 401. The sealing valve plate 4 and the middle connecting slide 401 are arranged on both sides of the upper valve plate groove 206 for opposite sliding movement and are provided with sealing rings. The sealing valve plate 4 is aligned with the centers 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 to achieve sealing. The side limiting grooves 205 and the side wedge-shaped limiting protrusions 106 are vertically slidably connected. The side connecting grooves 402 of the two middle connecting slides 401 are a groove structure narrowed from bottom to top. The side wedge-shaped limiting protrusions 106 and the side connecting grooves 402 are vertically slidably connected. The inclined surfaces of the side wedge-shaped limiting protrusions 106 are fitted with the inclined surfaces of the side connecting grooves 402. The side wedge-shaped limiting protrusions 106 push the side connecting grooves 402, the middle connecting slide 401 and the sealing valve plate 4 to move outward.

[0041] In the embodiments of the present disclosure, as shown in the attached Figure 1 , 2 As shown in 6, the upper threaded tube 202 is rotatably connected to the upper part of the main valve body 1, the upper threaded rod 201 is vertically axially slidably connected to the upper part of the main valve body 1 and is provided with a composite filler with a self-contained sealing ring structure for sealing, the upper end of the lower through hole 204 is connected to the middle connecting hole 203, the inner lifting valve member 2 will move downward and press the liquid inside the lower valve body chamber 103 toward the external connecting tube 105 to flow outward to the outflow pipe 101, discharge the excess liquid inside the lower valve body chamber 103, reduce the liquid residue inside the lower valve body chamber 103, and at the same time, the lower valve body chamber 103 can be re-injected with liquid each time it is opened to achieve flushing of the lower valve body chamber 103 and reduce the sediment inside the lower valve body chamber 103.

[0042] In the embodiments of the present disclosure, as shown in the attached Figure 1 , 2 As shown in Figures 3, 6 and 7, the inner lifting valve member 2 and the inner side surface of the lower valve body chamber 103 slide in contact with each other, and 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, the lower through hole 204 and the middle sealing slide column 104 fit and seal, and the middle sealing slide column 104 realizes the disconnection operation between the lower through hole 204 and the lower valve body chamber 103, thereby preventing the liquid in the middle connecting hole 203 from continuously flowing through the lower through hole 204 toward the inside of the lower valve body chamber 103 during the closing and downward movement of the inner lifting valve member 2, and also reducing the situation where the liquid flows back from the outflow pipe 101 to the middle connecting hole 203, thereby reducing the resistance of the inner lifting valve member 2 when it moves downward and closes.

[0043] In the embodiments of the present disclosure, as shown in the attached Figure 1 , 2 , 3, 6 and 7, when the middle communicating hole 203 is aligned with the centers of the outflow pipe 101 and the inflow pipe 102 and connected, the lower through hole 204 and the middle sealing sliding column 104 are in a separated state, and the lower end of the lower through hole 204 is connected with the lower valve body chamber 103, and the lower valve body chamber 103 is connected to the middle communicating hole 203 through the lower through hole 204, and the liquid in the middle communicating hole 203 flows into the lower valve body chamber 103 through the lower through hole 204, and the interior of the lower valve body chamber 103 is filled with liquid, balancing the lower valve body chamber 10 3 and the middle connecting hole 203, the liquid inside the lower valve body chamber 103 provides a certain support for the inner lift valve member 2, avoiding the sudden drop of the pressure in the middle connecting hole 203 causing the inner lift valve member 2 to drop suddenly, avoiding the risk of explosion or leakage, and at the same time, the liquid in the lower valve body chamber 103 also flows through the external connecting pipe 105 to the outflow pipe 101 to form a continuous flow path, reducing the scouring of the inner lift valve member 2 and the sealing valve plate 4 by the fluid, and extending the service life of the inner lift valve member 2 and the sealing valve plate 4.

[0044] In the embodiments of the present disclosure, as shown in the attached Figure 3 , 4 As shown in Figures 5 and 8, the rear sliding connecting ring 302 is fixedly arranged on one side of the head end of the outflow pipe 101 and the inflow pipe 102. When the sealing valve plate 4 is aligned with the centers of the outflow pipe 101 and the inflow pipe 102, the side wedge-shaped limiting protrusion 106 is at the upper part of the side connecting slide groove 402, and the inclined surface of the side wedge-shaped limiting protrusion 106 fits with the inclined surface of the side connecting slide groove 402. The side wedge-shaped limiting protrusion 106 pushes the side connecting slide groove 402, the middle connecting slide 401 and the sealing valve plate 4 to move outward, and the two middle connecting slides 401 move away from each other. The sealing valve plate 4 and the inner sealing ring 3 are further fitted and sealed through 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] Embodiment 2, on the basis of embodiment 1, a one-way valve is set at the position 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 slidingly connected, the sealing valve plate 4 and the middle connecting slide 401 are provided with a spiral support spring, and the middle connecting slide 401 compresses the sealing valve plate 4 by pressing the spiral support spring to move it to fit 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 flange matching bolts. A tightening screw is arranged on the upper part of the main valve body 1. The tightening screw tightens the upper threaded pipe 202 to achieve the tightening work of the upper threaded pipe 202 when not in use. When the upper threaded pipe 202 is in the closed state, the tightening screw realizes the self-locking of the upper threaded pipe 202, and the locking of the position of the internal lifting valve member 2 is realized to prevent the upper threaded pipe 202 from being accidentally opened due to misoperation or external interference rotation, thereby increasing safety. The upper threaded pipe 202 rotates, and the threads of the upper threaded pipe 202 guide the upper threaded rod 201 to move axially. The upper threaded rod 201 and the internal lifting valve member 2 are synchronously moved in the vertical direction inside the main valve body 1. The internal lifting valve member 2 moves up and down to realize the switching operation of disconnection and connection. The internal lifting valve member 2 moves up, and the middle connecting hole 203 is aligned with the outflow pipe 101 and the inflow pipe 102, so as to realize the connection operation of the outflow pipe 101, the inflow pipe 102 and the pipeline. The inner lifting valve member 2 and the middle connecting hole 203 and the lower connecting hole 204 move upward at the same time, and the lower connecting hole 204 moves upward along the middle sealing slide column 104. When the middle connecting hole 203 and the centers of the outflow pipe 101 and the inflow pipe 102 are aligned, the lower connecting hole 204 and the middle sealing slide column 104 are separated and kept at a certain interval, and the liquid in the middle connecting hole 203 flows into the lower valve body chamber 103 through the lower connecting hole 204, and the lower valve body chamber 103 is filled with liquid, balancing the lower valve body chamber 103 and the middle connecting hole 203, the liquid inside the lower valve body chamber 103 provides a certain support for the inner lift valve member 2, avoiding the sudden drop of the inner lift valve member 2 caused by the sudden drop of the 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 to the outflow pipe 101 through the external connecting pipe 105 to form a continuous flow path, reducing the scouring of the inner lift valve member 2 and the sealing valve plate 4 by the fluid, and extending the service life of the inner lift valve member 2, the sealing valve plate 4 and other related sealing parts;

[0047] The upper threaded tube 202 rotates, and the threads of the upper threaded tube 202 guide the upper threaded rod 201 to move axially and vertically downward. The upper threaded rod 201 and the inner lift valve member 2 synchronously move vertically downward inside the main valve body 1. When the inner lift valve member 2 moves downward and closes, the inner lift valve member 2 moves downward into the lower valve body chamber 103. The inner lift valve member 2 moves downward and presses the liquid inside the lower valve body chamber 103 toward the external connecting pipe 105 to flow outward to the outflow pipe 101 and discharge out of the lower valve body. The excess liquid in the chamber 103 reduces the residual liquid in the lower valve body chamber 103. At the same time, each time the valve is opened, the lower valve body chamber 103 can be refilled with liquid to achieve flushing of the lower valve body chamber 103, reducing the sediment inside the lower valve body chamber 103, and avoiding that when the existing valve is closed, the internal liquid of the lower valve body chamber 103 flows along the channel of the valve plate to the inside of the outflow pipe 101. The outflow pipe 101 itself is pressurized, resulting in a large reflux resistance of the liquid, causing internal lifting. The resistance when the lowering valve member 2 moves down and closes is large, and the device guides the liquid to the outflow pipe 101 through the external connecting pipe 105. The internal pressure of the outflow pipe 101 will also be reduced during the movement and closing process of the internal lifting valve member 2. The pressure of the outflow pipe 101 is smaller than that on the side of the inflow pipe 102, and the downward resistance of the internal lifting valve member 2 is also smaller, reducing the resistance when the internal lifting valve member 2 moves down and closes and the force requirements for the control personnel to operate or drive the motor, and reducing the torque requirements for the personnel or the driving motor. The tail end of the external connecting pipe 105 is connected to the upper part of the outflow pipe 101. As the closing of the internal lifting valve member 2 becomes smaller, the liquid inside the outflow pipe 101 is also reduced, and the pressure inside the outflow pipe 101 will also be smaller than that on the side of the inflow pipe 102, reducing the reaction force pressure of the liquid inside the outflow pipe 101 on the external connecting pipe 105. Compared with the external connecting pipe 105 connected to the bottom of the outflow pipe 101, it is in the upper position to avoid additional pressure such as gravity, and the pressure it is subjected to is relatively smaller;

[0048] When the inner lifting valve member 2 moves downward, the lower through hole 204 moves downward and approaches the middle sealing slide post 104 and slides in. The lower through hole 204 moves downward and the middle sealing slide post 104 slides in the state, and the middle sealing slide post 104 is at the inner side of the lower through hole 204 to block and seal the lower through hole 204. The middle sealing slide post 104 realizes the disconnection operation between the lower through hole 204 and the lower valve body chamber 103, avoiding the liquid in the middle communicating hole 203 to continue to flow through the lower through hole 204 to the inside of the lower valve body chamber 103 during the closing movement, cutting off the liquid flow between the lower valve body chamber 103 and the middle communicating hole 203, and also reducing the liquid from the outflow pipe 101 Backflow to the middle communicating hole 203 The inner lifting valve member 2 and the sealing valve plate 4 move downward synchronously, and the inner lifting valve member 2 and the sealing valve plate 4 gradually reduce and close the inlet pipe 102 and the outlet pipe 101, and the sealing valve plate 4 is aligned with the center of the outlet pipe 101 and the inlet pipe 102 to achieve closure, and the sealing valve plate 4 and the inner sealing ring 3 fit together to achieve sealing, and the side limiting slide groove 205 and the side wedge-shaped limiting protrusion 106 of the inner lifting valve member 2 slide to achieve vertical downward movement, and the side connecting slide groove 402 is connected to the side limiting slide groove 205 and slides with the side wedge-shaped limiting protrusion 106 at the same time, and the side wedge-shaped limiting protrusion 106 slides to the upper part of the side connecting slide groove 402. When the inclined surface of the side wedge-shaped limiting protrusion 106 is in the narrowing position, the inclined surface of the side wedge-shaped limiting protrusion 106 fits with the inclined surface of the side connecting slide groove 402, and the side wedge-shaped limiting protrusion 106 pushes the side connecting slide groove 402, the middle connecting slide 401 and the sealing valve plate 4 to move outward, and the sealing valve plate 4 further moves close 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 the temperature and adapts to the temperature change. The middle supporting elastic member 301 supports the inner sealing ring 3 to keep in contact with the surface of the inner lifting valve member 2 and the sealing valve plate 4. The inner sealing ring 3 presses the surface of the inner lifting valve member 2 and the sealing valve plate 4 during the lifting process. The residue is cleaned up and kept on the inner side of the inner sealing ring 3. The residue on the inner side of the inner sealing ring 3 can be taken away with the liquid inside the outflow pipe 101 and the inflow pipe 102. The inner sealing ring 3 and the rear sliding connecting ring 302 are compressed by the movement of the centering support elastic member 301. The change in the 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 contact surface between the concave inner annular groove 303 and the liquid, the flow and pressure of the liquid can drive the inner annular groove 303 and the inner sealing ring 3 to move and fit the sealing valve plate 4. The flow pressure of the liquid further enhances the sealing effect between the sealing valve plate 4 and the inner sealing ring 3.

[0049] In this article, there are a few points to note:

[0050] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0051] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0052] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An anti-burst self-locking flat gate valve, comprising: A main valve body (1), an internal lifting valve member (2), an internal sealing ring (3) and a sealing valve plate (4); characterized in that an internal lifting valve member (2) is vertically slidably arranged on the inner side of the main valve body (1), internal sealing rings (3) are arranged on both sides of the middle part of the main valve body (1), sealing valve plates (4) are arranged on both sides of the upper part of the internal lifting valve member (2), an outflow pipe (101) and an inflow pipe (102) are respectively connected to the middle sides of the main valve body (1), a lower valve body chamber (103) is arranged below the main valve body (1), a middle sealing sliding column (104) is fixedly arranged on the inner side of the lower valve body chamber (103), and an external connecting pipe (105) is fixedly arranged on the side of the main valve body (1).

2. The anti-explosion self-locking flat gate valve according to claim 1, characterized in that: Side wedge-shaped limiting protrusions (106) are protruding 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).

3. The anti-explosion self-locking flat gate valve according to claim 2 is characterized in that: An upper threaded rod (201) is fixedly provided on the top of the inner lift valve component (2), an upper threaded tube (202) is screwed onto the upper portion of the upper threaded rod (201), a middle connecting hole (203) is penetrated through the lower portion of the inner lift valve component (2), a lower through hole (204) is provided at the lower portion of the middle connecting hole (203) of the inner lift valve component (2), side limiting sliding grooves (205) are provided on both sides of the inner lift valve component (2), and an upper valve plate groove (206) is provided at the upper portion of the inner lift valve component (2).

4. The anti-explosion self-locking flat gate valve according to claim 3 is 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 vertically axially slidably connected to the upper part of the main valve body (1), and the upper end of the lower through hole (204) is connected to the middle connecting hole (203).

5. The anti-explosion self-locking flat gate valve according to claim 4, characterized in that: The inner lifting valve member (2) and the inner side surface of the lower valve body chamber (103) are slidably fitted, and 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.

6. The anti-explosion self-locking flat gate valve according to claim 5, characterized in that: When 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 sliding column (104) are in a separated state, the lower end of the lower through hole (204) and the lower valve body chamber (103) remain connected, and the lower valve body chamber (103) is connected to the middle connecting hole (203) through the lower through hole (204).

7. The anti-explosion self-locking flat gate valve according to claim 6, characterized in that: The inner sealing ring (3) is axially slidably connected to a rear sliding connection ring (302), a middle supporting elastic member (301) is fixedly arranged between the inner sealing ring (3) and the rear sliding connection ring (302), an inner annular groove (303) is concavely arranged on the inner side of the head end of the inner sealing ring (3), and the middle supporting elastic member (301) supports the inner sealing ring (3) and the sealing valve plate (4) and the inner lifting valve member (2) to maintain fit.

8. The anti-explosion self-locking flat gate valve according to claim 7, characterized in that: A middle connecting slide (401) is fixedly arranged on the back of the sealing valve plate (4), and side connecting slide grooves (402) are arranged on both sides of the middle connecting slide (401). The sealing valve plate (4) and the middle connecting slide (401) are arranged on both sides of the upper valve plate groove (206) in a slidable manner in opposite directions.

9. The anti-explosion self-locking flat gate valve according to claim 8, characterized in that: The side limiting slide groove (205) and the side wedge-shaped limiting protrusion (106) are vertically slidably connected, the side connecting slide grooves (402) of the two middle connecting slides (401) are slide groove structures narrowing from the bottom to the top, and the side wedge-shaped limiting protrusion (106) and the side connecting slide groove (402) are vertically slidably connected.

10. The anti-explosion self-locking flat gate valve according to claim 9, characterized in that: The rear sliding connection ring (302) is fixedly arranged on one side of the head end of the outflow pipe (101) and the inflow pipe (102). When the sealing valve plate (4) and the centers 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 connection slide groove (402), and the two middle connection slides (401) move away from each other, so that the sealing valve plate (4) and the inner sealing ring (3) are further fitted and sealed.

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