High-head inlet and outlet accident plane gate device

Abstract

This utility model discloses a high-head inlet / outlet emergency planar gate device, comprising: a water conveyance pipeline; and a planar gate, which is movably disposed in the water conveyance pipeline to change the opening of the water conveyance pipeline. The bottom of the planar gate has a first oblique cut surface, which extends upwards along the water-facing side of the planar gate, starting from the bottom edge of the gate's water-facing side. The first oblique cut surface transitions to the main surface of the planar gate through an arc structure. According to this application, the arc structure reduces energy loss and pressure fluctuations during water flow, significantly optimizing the bottom flow state of the planar gate. This results in more uniform force distribution and a more stable flow field at the bottom of the planar gate during ultra-high head closure, thereby reducing the risk of structural vibration and fatigue damage, and improving the safety and durability of the planar gate operation.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic plane gate technology, and in particular to a high-head inlet and outlet accident plane gate device. Background Technology

[0002] Under ultra-high head conditions, the closure of a planar gate typically relies on the weight of the water column to drive the gate's descent. When the planar gate descends to near the sill, the flow cross-section in front of the gate contracts sharply due to the gate's obstruction, causing the water column pressure at the top of the gate to rise to its peak. Simultaneously, the water is subjected to intense compression, and the flow velocity in front of the gate increases sharply, forming a high-speed jet, resulting in high-intensity water flow impact at the bottom of the gate. At this point, the flow at the bottom of the planar gate exhibits strong turbulent characteristics, with significant local pressure fluctuations. This not only exacerbates the risk of structural vibration and fatigue damage but also makes the bottom region a critical weak point in the entire planar gate system.

[0003] Therefore, there is an urgent need for a new type of high-head accident plane gate that can improve the structural stress state and enhance operational safety. Utility Model Content

[0004] The main purpose of this utility model is to provide a high-head inlet and outlet accident planar gate device to solve the problems of bottom flow turbulence, concentrated impact load and weak structure in the existing planar gate during the closing process.

[0005] To achieve the above objectives, this application proposes a high-head inlet / outlet emergency planar gate device, comprising: Water pipeline; A planar gate is movably disposed in the water conveyance pipeline to change the opening of the water conveyance pipeline. The bottom of the planar gate is provided with a first oblique surface. The first oblique surface starts from the bottom edge of the water-facing side of the planar gate and extends upward along the water-facing side of the planar gate. The first oblique surface and the large surface of the planar gate are transitioned by an arc structure.

[0006] According to the high-head inlet and outlet accident planar gate device of this application, the radius of the arc structure is R, and the diameter of the water conveyance pipeline is D, where R and D satisfy: 0.2D≤R≤0.5D.

[0007] According to the high-head inlet and outlet accident planar gate device of this application, the arc structure is made of alloy steel material, and the surface of the arc structure is provided with an anti-corrosion coating.

[0008] According to the high-head inlet and outlet accident planar gate device of this application, the included angle θ between the first oblique surface and the bottom end face of the planar gate satisfies: 130°≤θ≤150°.

[0009] According to the high-head inlet / outlet accident planar gate device of this application, a plurality of main wheel assemblies are provided on one end face of the planar gate in the width direction. The plurality of main wheel assemblies are spaced apart along the height direction of the planar gate. A second oblique cut surface is provided in a section at the bottom of the planar gate and near the main wheel assembly. The second oblique cut surface starts from the bottom edge of the backwater side of the planar gate and extends obliquely upward along the backwater side of the planar gate. The extension length of the second oblique cut surface in the width direction of the planar gate is less than the width of the planar gate.

[0010] Optionally, the second oblique cut surface starts from the bottom edge of the planar gate, and the upward angle of the top of the second oblique cut surface deviating from the horizontal plane is β. The first oblique cut surface starts from the bottom edge of the planar gate, and the upward angle of the top of the first oblique cut surface deviating from the horizontal plane is γ. β is greater than γ.

[0011] According to the high-head inlet and outlet accident planar gate device of this application, the top of the planar gate is provided with a sealing assembly, the sealing assembly is located on the backwater side of the planar gate, the sealing assembly includes a telescopic water seal body, the telescopic water seal body is provided with a back pressure chamber, the back pressure chamber is connected to a pressure regulating pipeline, the back pressure chamber is used to drive the sealing head of the telescopic water seal body to extend outward by filling with a medium, so as to press against the inner wall of the water conveying pipeline.

[0012] Optionally, the sealing head of the telescopic water seal body includes a main sealing head and a secondary sealing head. The secondary sealing head is located on the back side of the main sealing head, and a buffer gap is formed between the main sealing head and the secondary sealing heads on both sides.

[0013] Optionally, the main sealing head has a semi-circular cross-section, the outer convex surface of the main sealing head is used to abut against the inner wall of the water supply pipe, the inner concave surface of the main sealing head faces the back pressure cavity and is connected to the wall of the back pressure cavity, the secondary sealing head has a flat lip shape in cross-section, and in the thickness direction of the planar gate, the maximum distance between the outer edge of the secondary sealing head and the planar gate is smaller than the maximum distance between the outer convex surface of the main sealing head and the planar gate.

[0014] Optionally, the back pressure chamber is provided with a pressure relief channel, and the pressure relief channel is provided with a one-way valve. The one-way valve is configured to open only from the inside of the back pressure chamber to the outside, so that when the water pressure in the water supply pipeline is lower than a preset value, the medium in the back pressure chamber is allowed to be released to the outside through the pressure relief channel.

[0015] The technical solution provided by the utility model embodiments has the following advantages compared with the prior art: The high-head inlet and outlet emergency planar gate device provided in this embodiment of the utility model is used for water conveyance pipeline. The planar gate adjusts the opening of the water conveyance pipeline through a movable means such as lifting and lowering guide rails, thereby achieving the interception or control of the water flow in the water conveyance pipeline. Under normal operating conditions, it can be opened to allow water flow, and under emergency conditions, it falls to the closed position to achieve rapid interception of the water flow in the water conveyance pipeline, thus protecting the pipeline system and downstream facilities. When the planar gate falls to close the water conveyance pipeline, the first inclined surface of the planar gate on the water-facing side extends upward from the bottom edge, which can guide the water flow in front of the gate to flow smoothly along the inclined surface, avoiding the water flow directly impacting the bottom corner of the planar gate. At the same time, the arc structure between the first inclined surface and the large surface of the planar gate eliminates the right angle corner through a smooth transition, so that the water flow forms a continuous flow at the junction of the first inclined surface and the planar surface, reducing local turbulence and eddies caused by abrupt changes in the flow field, and adapting to the safety control requirements in high-head environments.

[0016] The high-head inlet and outlet emergency planar gate device provided in this embodiment effectively disperses the water flow impact load at the bottom of the planar gate through the inclined guiding effect of the first oblique surface, reducing the direct scouring of the bottom structure of the planar gate by the high-speed jet. The arc structure avoids the stress concentration problem at the bottom of the gate in traditional right-angle connections, reduces energy loss and pressure fluctuations when the water flows around it, and significantly optimizes the flow state at the bottom of the planar gate. This makes the bottom of the planar gate more uniformly stressed and the flow field more stable during the closing process of the planar gate at ultra-high head, thereby reducing the risk of structural vibration and fatigue damage, and improving the safety and durability of the planar gate operation. Attached Figure Description

[0017] Figure 1 A front view of the high-head inlet / outlet accident planar gate device provided in an embodiment of this utility model.

[0018] Figure 2 for Figure 1 Cross-sectional view at point AA.

[0019] Figure 3 for Figure 1 Cross-sectional view at point BB.

[0020] Figure 4 for Figure 1 Side view in the direction of E.

[0021] Figure 5 for Figure 4 Enlarged view of point F in the middle.

[0022] Label Explanation: Planar gate 10, first oblique surface 11, arc structure 12, second oblique surface 13, sealing assembly 20, main sealing head 21, secondary sealing head 22, back pressure chamber 23, main wheel assembly 30, water conveying pipeline 40, pressure regulating pipeline 50. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0025] like Figure 1 , Figure 2 and Figure 5 As shown, the high-head inlet and outlet accident planar gate 10 device according to an embodiment of this application includes: a water conveying pipeline 40 and a planar gate 10. The planar gate 10 is movably disposed in the water conveying pipeline 40 to change the opening of the water conveying pipeline 40. The bottom of the planar gate 10 is provided with a first oblique surface 11. The first oblique surface 11 starts from the bottom edge of the water-facing side of the planar gate 10 and extends upward obliquely along the water-facing side of the planar gate 10. The first oblique surface 11 and the large surface of the planar gate 10 are transitioned by an arc structure 12.

[0026] The water conveying pipeline 40 is used for water transport. The plane gate 10 adjusts the opening of the water conveying pipeline 40 by means of movable means such as lifting and lowering the guide rail, thereby realizing the interception or control of the water flow in the water conveying pipeline 40. Under normal working conditions, it can be opened to allow water to flow through, and under emergency working conditions, it falls to the closed position to realize the rapid interception of the water flow in the water conveying pipeline 40, which plays a role in protecting the pipeline system and downstream facilities.

[0027] The large surface of the planar gate 10 is flat. The planar gate 10 is movably installed inside the water conveyance pipeline 40 and its vertical position within the pipeline 40 can be changed by the lifting and lowering action of a preset guide rail, thereby adjusting the opening of the pipeline 40. Under normal operating conditions, the planar gate 10 can open upwards, providing sufficient passage for water flow. In the event of an accident, the gate quickly falls to the closed position, precisely cutting off the water flow within the pipeline 40, thus preventing the accident from escalating and playing a crucial role in protecting the pipeline system and downstream facilities. The planar gate 10 includes a water-facing side and a water-returning side, where the water-facing side directly faces the incoming water, and the water-returning side faces away from the incoming water.

[0028] When the planar gate 10 falls to close the water supply pipeline 40, the first oblique surface 11 on the water-facing side of the planar gate 10 extends upward from the bottom edge, which can guide the water flow in front of the gate to flow smoothly along the oblique surface, avoiding the water flow from directly impacting the bottom corner of the planar gate 10. At the same time, the arc structure 12 between the first oblique surface 11 and the large surface of the planar gate 10 eliminates the right angle corner through a smooth transition, so that the water flow forms a continuous flow state at the junction of the first oblique surface 11 and the planar surface, reducing the local turbulence and eddies caused by the sudden change of the flow field, and adapting to the safety control requirements in high water head environments.

[0029] The first oblique cut surface 11 and the large surface of the planar gate 10 (i.e., the planar part of the gate body) are connected by an arc structure 12. This arc structure 12, with its smooth curved surface, eliminates the right-angle corner between the oblique cut surface and the planar surface, allowing the water flow to form a continuous and stable flow pattern at the junction of the oblique cut surface and the planar surface. This effectively reduces local turbulence, eddies, and pressure fluctuations caused by abrupt changes in the flow field, optimizing the water flow environment at the bottom of the planar gate 10. The arc structure 12 can be formed using CNC cutting, cold bending forming processes, etc., and then connected to the planar gate 10 by welding or high-strength bolts. In other words, the main body of the planar gate 10 can be designed as a rectangular solid shape, and the overall bottom structure formed by the arc structure 12 and the first oblique cut surface 11 can be connected to the bottom of the main body of the planar gate 10, thus forming the integral planar gate 10.

[0030] The high-head inlet and outlet emergency planar gate 10 device according to the embodiments of this application is particularly suitable for water conservancy hubs and pumped storage power station intakes with a head ≥ 80m. Through the inclined guiding effect of the first oblique surface 11, the impact load of the water flow at the bottom of the planar gate 10 is effectively dispersed, reducing the direct scouring of the bottom structure of the planar gate 10 by the high-speed jet. The arc structure 12 avoids the stress concentration problem at the bottom of the gate with a traditional right-angle connection, reduces the energy loss and pressure fluctuation when the water flows around it, and significantly optimizes the flow state at the bottom of the planar gate 10. This makes the bottom of the planar gate 10 more uniformly stressed and the flow field more stable during the closing process of the ultra-high head gate, thereby reducing the risk of structural vibration and fatigue damage and improving the safety and durability of the planar gate 10 operation.

[0031] like Figure 4 As shown, in the high-head inlet and outlet accident plane gate 10 device according to the embodiment of this application, the radius of the arc structure 12 is R, and the diameter of the water conveyance pipe 40 is D. R and D satisfy: 0.2D≤R≤0.5D.

[0032] When water flows through the bottom of the planar gate 10, the radius R of the arc structure 12 matches the size of the water supply pipe 40, forming a smooth transition surface adapted to the water flow trajectory. Within this range, the arc structure 12 can guide the water flowing along the first oblique surface 11 to naturally turn towards the larger surface of the planar gate 10, avoiding abrupt changes in water flow due to excessively small transition curvature, or local flow field expansion and turbulence caused by excessive curvature, ensuring that the water flow maintains a continuous and stable flow state in the transition region. R can be 0.2D, 0.25D, 0.3D, 0.35D, 0.4D, 0.45D, and 0.5D, etc. In a specific embodiment, R = 0.3D yields the best results.

[0033] According to the high-head inlet and outlet accident plane gate 10 device of this application embodiment, the arc structure 12 is made of alloy steel material, and the surface of the arc structure 12 is provided with anti-corrosion coating.

[0034] Alloy steel materials can include Q345R, stainless steel composite plates, and chromium-molybdenum alloy steel, etc. The anti-corrosion coating can be an epoxy zinc-rich primer + epoxy micaceous iron oxide intermediate paint + polyurethane topcoat, or a composite coating such as thermal spray zinc + epoxy coating.

[0035] Alloy steel possesses high strength and high toughness. The arc structure 12, serving as a crucial transition between the bottom beveled surface and the main surface of the planar gate 10, is made of alloy steel. This allows the arc structure 12 to withstand the impact of high-head water flow and the loads generated by long-term friction, resisting surface wear from impurities in the water flow and preventing deformation or breakage due to insufficient structural strength. Simultaneously, the surface of the arc structure 12 is coated with an anti-corrosion coating. This coating forms a continuous and dense protective film on the alloy steel substrate, isolating the alloy steel material from direct contact with water flow, water vapor, and corrosive media in the water, thus enhancing the corrosion resistance of the arc structure 12.

[0036] like Figure 4 As shown, in the high-head inlet and outlet accident planar gate 10 device according to the embodiment of this application, the included angle θ between the first oblique surface 11 and the bottom end surface of the planar gate 10 satisfies: 130°≤θ≤150°.

[0037] The bottom surface of the planar gate 10 is located at the junction of the bottom of the water-facing side and the back water-facing side of the planar gate 10, and it abuts against the bottom sill of the water conveyance pipe 40 when the planar gate 10 falls and closes.

[0038] If θ satisfies the above range, the first inclined plane 11 will be neither too steep nor too gentle, preventing the water flow from impacting the bottom surface vertically. It also prevents the formation of stagnant eddies at the junction of the first inclined plane 11 and the bottom surface, guiding the water flow smoothly upwards along the first inclined plane 11, reducing sudden changes in direction at the edge of the bottom surface of the planar gate 10, and lowering the local water flow impact intensity. θ can be 130°, 135°, 140°, 145°, or 150°, etc.

[0039] like Figure 1 , Figure 2 and Figure 4 As shown, in the high-head inlet and outlet accident planar gate 10 device according to the embodiment of this application, a plurality of main wheel assemblies 30 are provided on one end face of the planar gate 10 in the width direction. The plurality of main wheel assemblies 30 are spaced apart along the height direction of the planar gate 10. A second oblique surface 13 is provided in a section at the bottom of the planar gate 10 and near the main wheel assembly 30. The second oblique surface 13 extends obliquely upward along the backwater side of the planar gate 10, starting from the bottom edge of the backwater side of the planar gate 10. The extension length of the second oblique surface 13 in the width direction of the planar gate 10 is less than the width of the planar gate 10.

[0040] The main wheel assembly 30 is disposed on one end face of the planar gate 10 in the width direction. This end face is the longitudinal side face of the planar gate 10 in the width direction and is perpendicularly connected to the planes of the water-facing and water-returning sides of the planar gate 10. The main wheel assemblies 30 are arranged at intervals along the height direction of the gate, which can provide guidance and support for the movement of the planar gate 10, ensuring that the planar gate 10 moves stably up and down along a preset trajectory within the water conveyance pipeline 40, and reducing the frictional resistance between the gate and the inner wall of the water conveyance pipeline 40 during the opening and closing process.

[0041] In one specific embodiment, the main wheel assembly 30 adopts a double roller structure and is connected to the steel bracket on the end face of the gate through bearings. The bracket is fixed to the gate body by welding.

[0042] like Figure 2 and Figure 4 As shown, the second oblique cut surface 13, located in the section near the main wheel assembly 30 at the bottom of the planar gate 10, extends upwards along the backwater side, starting from the bottom edge of the backwater side. Its width is less than the total width of the gate. In terms of the lateral coverage of the planar gate 10, the second oblique cut surface 13 extends from the end face of the planar gate 10 where the main wheel assembly 30 is located, towards the other end face in the width direction of the planar gate 10, but is spaced apart from the other end face. That is, the lateral extension length of the second oblique cut surface 13 is less than the total width of the planar gate 10, generally 1 / 3 to 1 / 2 of the total width of the planar gate 10. It can be seen that... Figure 4 The second oblique cut surface 13 is not set at the corresponding plane gate 10 in the mid-section view.

[0043] When the planar gate 10 falls or is in operation, the second oblique surface 13 can guide the water flow on the back side to flow upward along the inclined surface, specifically diverting the water flow near the main wheel assembly 30, avoiding the formation of stagnation or eddies in the support area of ​​the main wheel assembly 30, and at the same time dispersing the water pressure load on the main wheel side by means of the inclination angle.

[0044] like Figure 2 As shown, in some embodiments, the second oblique surface 13 starts from the bottom edge of the planar gate 10, and the upward angle of the top of the second oblique surface 13 deviating from the horizontal plane is β. The first oblique surface 11 starts from the bottom edge of the planar gate 10, and the upward angle of the top of the first oblique surface 11 deviating from the horizontal plane is γ. β is greater than γ.

[0045] The second oblique cut surface 13 is located on the backwater side of the planar gate 10 and close to the bottom section of the main wheel assembly 30. Its starting point is the bottom edge of the backwater side and it extends upward along the backwater side surface. The upward angle of the top of the second oblique cut surface 13 deviating from the horizontal plane is defined as β. The first oblique cut surface 11 is located on the water-facing side of the planar gate 10. Its starting point is the bottom edge of the water-facing side, and it extends upward along the surface of the water-facing side. The upward angle of the top of the first oblique cut surface 11 from the horizontal plane is defined as γ. β > γ, so that the first oblique cut surface 11 on the water-facing side guides the high-speed flow to flow upward along the gentle slope with a small upward angle γ. The moderate inclination disperses the direct impact of the water flow on the bottom of the planar gate 10, avoiding water flow reflection turbulence caused by excessively steep angles. The second oblique cut surface 13 on the back side of the planar gate 10 acts on the local water flow near the main wheel assembly 30 with a larger upward angle β. Since the gap between the main wheel assembly 30 and the guide rail is prone to forming vortices, the larger inclination angle can enhance the guiding capacity of the water flow on the back side of the planar gate 10, accelerate the upward discharge of the water flow along the slope, and reduce the residence time of the vortex in the area near the main wheel assembly 30. In some embodiments, β is 55°, 54°, 53°, 52°, 51°, and 50°, etc., and γ is 40°, 41°, 42°, 43°, 44°, and 45°, etc. Since the angle between the first oblique cut surface 11 and the bottom end surface is θ, and the upward angle between the first oblique cut surface 11 and the horizontal plane is γ, and the bottom end surface is approximately horizontal, θ and γ form a complementary relationship, and the sum of γ and θ is 180°.

[0046] like Figure 4 and Figure 5 As shown, according to an embodiment of this application, a high-head inlet and outlet accident planar gate 10 device is provided at the top of the planar gate 10. The sealing component 20 is located on the backwater side of the planar gate 10. The sealing component 20 includes a telescopic water seal body. The telescopic water seal body is provided with a back pressure chamber 23. The back pressure chamber 23 is connected to a pressure regulating pipeline 50. The back pressure chamber 23 is used to drive the sealing head of the telescopic water seal body to extend outward by filling with a medium, so as to press against the inner wall of the water conveying pipeline 40.

[0047] The sealing assembly 20 is located on the backwater side of the planar gate 10. It is long and narrow in shape. The telescopic water seal body has a pre-reserved deformable space, which can be extended and retracted along the thickness direction of the planar gate 10 to deform and realize the extension and retraction of the sealing head.

[0048] The back pressure chamber 23 is a closed cavity inside the telescopic water seal body, which can be configured as an annular or strip-shaped cavity matching the contour of the telescopic water seal body. The back pressure chamber 23 can be filled with media such as high-pressure water or compressed air. When the media is filled, the pressure inside the back pressure chamber 23 increases, and the pressure is transmitted to the elastic structure of the telescopic water seal body through the inner wall of the back pressure chamber 23, forming a mechanical force that drives the sealing head to extend outward.

[0049] The pressure regulating line 50 is a channel connecting the back pressure chamber 23 to an external pressure source. One end is sealed and connected to the back pressure chamber 23, and the other end is connected to the pressure control system of the planar gate 10. The pressure regulating line 50 can be a metal pipeline with a control valve. The pressure regulating line 50 is used to regulate the pressure and flow rate of the medium entering the back pressure chamber 23. By adjusting the pressure, the expansion and contraction of the telescopic water seal body is controlled, which ensures that the sealing head fits tightly against the inner wall of the pipeline, while avoiding excessive deformation or damage to the water seal body due to excessive pressure.

[0050] The sealing head is the end portion of the telescopic water seal body furthest from the planar gate 10. The shape of the sealing head can be arc-shaped or planar, adapted to the curvature of the inner wall of the water supply pipe 40. When the back pressure chamber 23 is pressurized, the sealing head extends outward under the drive of the telescopic water seal body, eventually pressing against the inner wall surface of the water supply pipe 40. Through elastic compression, a continuous sealing surface is formed, blocking the gap between the top of the planar gate 10 and the inner wall of the water supply pipe 40, thereby achieving a seal.

[0051] When the planar gate 10 descends to the closed position, medium is introduced into the back pressure chamber 23 through the pressure regulating pipeline 50. The medium creates a stable pressure within the back pressure chamber 23, which drives the telescopic water seal body to undergo elastic deformation, causing the sealing head at the front end to extend outwards. Because the sealing assembly 20 adapts to the inner wall contour of the water supply pipeline 40, the extended sealing head can tightly press against the inner wall surface of the water supply pipeline 40, thereby forming a continuous sealing contact zone between the top of the planar gate 10 and the inner wall of the water supply pipeline 40, blocking any possible leakage channels on the back side. The pressure regulating pipeline 50 can dynamically adjust the medium pressure within the back pressure chamber 23 according to actual operating conditions, ensuring that the sealing head always maintains sufficient tightening force to meet the sealing requirements in high-head environments.

[0052] Understandably, after the planar gate 10 is closed, the main direction of water leakage is from the upstream side through the gap between the gate and the inner wall of the pipe to the downstream side. By placing the sealing component 20 on the downstream side, it can directly intercept the leakage at the "downstream end" of the leakage path. The sealing position is closer to the leakage endpoint, resulting in higher interception efficiency. Furthermore, the impact force of the top water flow on the downstream side of the planar gate 10 is significantly reduced, which can reduce fatigue damage to the sealing component 20 and extend its service life.

[0053] like Figure 4 and Figure 5 As shown, in some embodiments, the sealing head of the telescopic water seal body includes a main sealing head 21 and a secondary sealing head 22. The secondary sealing head 22 is located on the back side of the main sealing head 21, and a buffer gap is formed between the main sealing head 21 and the secondary sealing heads 22 on both sides.

[0054] The main sealing head 21 is located at the front end near the water-facing side, and its shape is adapted to the curvature or planar shape of the inner wall of the water supply pipe 40. When the back pressure chamber 23 is filled with medium and drives the sealing head to extend outward, the main sealing head 21 first presses against the inner wall of the pipe, directly blocking the main leakage path from the water-facing side to the back water side.

[0055] The secondary sealing head 22 is located on the back side of the main sealing head 21, maintaining a certain distance from the main sealing head 21 and arranged along the same extension direction. The structure of the secondary sealing head 22 is adapted to the main sealing head 21, but its sealing pressure is slightly lower than that of the main sealing head 21. When the main sealing head 21 experiences slight leakage due to long-term wear, local deformation, or other reasons, the secondary sealing head 22 can form a secondary seal with the inner wall of the pipe to prevent further leakage.

[0056] A buffer gap is naturally formed between the main sealing head 21 and the two auxiliary sealing heads 22 on both sides. The buffer gap is a hollow area with a certain width. During the process of the sealing head extending outward and pressing against the inner wall of the water supply pipe 40, the buffer gap can accommodate the redundancy caused by the deformation of the expansion and contraction of the water seal body due to compression, and avoid local stress concentration caused by rigid contact between the main and auxiliary sealing heads 22.

[0057] like Figure 5 As shown, in some embodiments, the main sealing head 21 has a semi-circular cross-section, the outer convex surface of the main sealing head 21 is used to abut against the inner wall of the water supply pipe 40, the inner concave surface of the main sealing head 21 faces the back pressure cavity 23 and is connected to the wall of the back pressure cavity 23, the cross-section of the secondary sealing head 22 is flat lip-shaped, and in the thickness direction of the planar gate 10, the maximum distance between the outer edge of the secondary sealing head 22 and the planar gate 10 is smaller than the maximum distance between the outer convex surface of the main sealing head 21 and the planar gate 10.

[0058] The outer convex surface of the main sealing head 21 is a smooth arc-shaped surface. When the back pressure cavity 23 is filled with medium, the outer convex surface of the main sealing head 21 can tightly abut against the inner wall of the water supply pipe 40 to form a seal, adapting to the slight unevenness of the inner wall of the water supply pipe 40. The inner concave surface of the main sealing head 21 faces the back pressure cavity 23 on the back water side and is fixedly connected to the wall of the back pressure cavity 23, so that the pressure of the back pressure cavity 23 can be directly transmitted to the main sealing head 21, driving the main sealing head 21 to expand outward, ensuring that the outer convex surface forms sufficient sealing pressure with the inner wall of the water supply pipe 40.

[0059] The auxiliary sealing head 22 is an auxiliary sealing component located on the backwater side of the main sealing head 21. An annular buffer gap can be formed between the auxiliary sealing head 22 and the main sealing head 21. The maximum distance from the outer edge of the auxiliary sealing head 22 to the gate body is less than the maximum distance from the outer convex surface of the main sealing head 21 to the gate body, so that the main sealing head 21 preferentially contacts the inner wall of the water conveying pipeline 40 under the drive of the medium to form a main seal. Only when the main sealing head 21 has a slight leakage due to wear, deformation or other reasons, the auxiliary sealing head 22 adheres to the inner wall of the pipeline through its own elasticity or the indirect pressure of the back pressure cavity 23 to form a secondary sealing barrier.

[0060] In some embodiments, the back pressure chamber 23 is provided with a pressure relief channel, and a one-way valve is provided on the pressure relief channel. The one-way valve is configured to be opened only from the inside to the outside of the back pressure chamber 23, so that when the water pressure in the water supply pipe 40 is lower than a preset value, the medium in the back pressure chamber 23 is allowed to be released to the outside through the pressure relief channel.

[0061] The pressure relief channel is a medium release passage provided on the back pressure chamber 23. One end of the pressure relief channel is connected to the inside of the back pressure chamber 23, and the other end extends to the outside of the telescopic water seal body. It only allows the medium to flow from the inside to the outside of the back pressure chamber 23, and completely blocks the flow in the opposite direction. When the water pressure in the water supply pipeline 40 is higher than the preset value, such as when the gate is closed to block the high-head water flow, the pressure of the water flow in the water supply pipeline 40 on the sealing head is greater than the medium pressure in the back pressure chamber 23. Since the one-way valve remains closed, the medium pressure in the back pressure chamber 23 is maintained, driving the main sealing head 21 to extend outward and press against the inner wall of the pipeline to ensure the sealing effect.

[0062] When the water pressure in the water supply pipeline 40 is lower than the preset value, such as when the gate is open and the water flows normally, the pressure of the water supply pipeline 40 on the main sealing head 21 is reduced. At this time, the medium pressure in the back pressure chamber 23 pushes the one-way valve to open, and the medium is released outward through the pressure relief channel, so that the main sealing head 21 of the telescopic water seal body naturally retracts, avoiding the main sealing head 21 from continuously squeezing the inner wall of the water supply pipeline 40 under low water pressure conditions, which would lead to excessive wear or deformation, thereby balancing the sealing reliability and component durability.

[0063] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A high head inlet and outlet accident flat gate arrangement, characterized in that, include: Water pipeline; A planar gate is movably disposed in the water conveyance pipeline to change the opening of the water conveyance pipeline. The bottom of the planar gate is provided with a first oblique surface. The first oblique surface starts from the bottom edge of the water-facing side of the planar gate and extends upward along the water-facing side of the planar gate. The first oblique surface and the large surface of the planar gate are transitioned by an arc structure.

2. The high head intake and outlet emergency flat gate arrangement according to claim 1, characterized in that, The radius of the arc structure is R, and the diameter of the water supply pipe is D. R and D satisfy: 0.2D≤R≤0.5D.

3. The high head intake and outlet emergency flat gate arrangement according to claim 1, characterized in that, The arc structure is made of alloy steel and has an anti-corrosion coating on its surface.

4. The high-head inlet and outlet emergency planar gate device according to claim 1, characterized in that, The angle θ between the first oblique cut surface and the bottom end face of the planar gate satisfies: 130°≤θ≤150°.

5. The high-head inlet / outlet emergency planar gate device according to any one of claims 1-4, characterized in that, The planar gate has multiple main wheel assemblies on one end face in the width direction. The multiple main wheel assemblies are spaced apart along the height direction of the planar gate. A second oblique cut surface is provided in a section at the bottom of the planar gate and near the main wheel assembly. The second oblique cut surface starts from the bottom edge of the backwater side of the planar gate and extends upward obliquely along the backwater side of the planar gate. The extension length of the second oblique cut surface in the width direction of the planar gate is less than the width of the planar gate.

6. The high-head inlet and outlet emergency planar gate device according to claim 5, characterized in that, The second oblique cut surface starts from the bottom edge of the planar gate, and the upward angle of the top of the second oblique cut surface deviating from the horizontal plane is β. The first oblique cut surface starts from the bottom edge of the planar gate, and the upward angle of the top of the first oblique cut surface deviating from the horizontal plane is γ. β is greater than γ.

7. The high-head inlet / outlet emergency planar gate device according to any one of claims 1-4, characterized in that, The top of the planar gate is provided with a sealing assembly, which is located on the backwater side of the planar gate. The sealing assembly includes a telescopic water seal body, and the telescopic water seal body has a back pressure chamber inside. The back pressure chamber is connected to a pressure regulating pipeline. The back pressure chamber is used to drive the sealing head of the telescopic water seal body to extend outward by filling it with a medium, so as to press against the inner wall of the water conveying pipeline.

8. The high-head inlet and outlet emergency planar gate device according to claim 7, characterized in that, The sealing head of the telescopic water seal body includes a main sealing head and a secondary sealing head. The secondary sealing head is located on the back side of the main sealing head, and a buffer gap is formed between the main sealing head and the secondary sealing heads on both sides.

9. The high-head inlet and outlet emergency planar gate device according to claim 8, characterized in that, The main sealing head has a semi-circular cross-section. The convex surface of the main sealing head is used to abut against the inner wall of the water supply pipe. The concave surface of the main sealing head faces the back pressure cavity and is connected to the wall of the back pressure cavity. The secondary sealing head has a flat lip shape in cross-section. In the thickness direction of the planar gate, the maximum distance between the outer edge of the secondary sealing head and the planar gate is smaller than the maximum distance between the convex surface of the main sealing head and the planar gate.

10. The high-head inlet / outlet emergency planar gate device according to claim 8 or 9, characterized in that, The back pressure chamber is provided with a pressure relief channel, and a one-way valve is provided on the pressure relief channel. The one-way valve is configured to open only from the inside of the back pressure chamber to the outside, so that when the water pressure in the water supply pipeline is lower than a preset value, the medium in the back pressure chamber is allowed to be released to the outside through the pressure relief channel.

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