Damping sand discharge flap gate based on hydraulic self-control
By designing a damping sand-releasing flap gate based on hydraulic self-control, the problems of water level elevation, flow rate reduction, and sediment deposition in the existing technology are solved, and the smooth operation of the gate when the water level changes and Effective sand discharge of mud and sand.
Patent Information
- Application Number
- CN202411843702.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-14
- Publication Date
- 2025-02-18
AI Technical Summary
When the existing hydraulic automatic flap gate is running in mountain rivers, the gate is in a water barrier before it is opened, resulting in the water level rise, the flow rate decreases, the sand loading force decreases, and the sediment deposits at the bottom of the front gate, affecting the normal operation of the gate. .
A damping sand leakage flip gate based on hydraulic self-control was designed, including a groove-like body, damper, flip gate and rotary damper. The flip gate plate cooperates with the weir to form a water injection area, and the rotary damper controls the opening of the gate plate to ensure the stability of the water flow.
This design enables the gate to flip smoothly and without vibration when the water level changes, avoids sudden overturning, frequent swinging and slapping, reduces the overall vibration of the engineering structure, ensures effective sand leakage of silt and sand, and avoids damage to the gate.
Smart Images
Figure CN119465884A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of water conservancy projects, and in particular to a damping sand-discharging flap gate based on hydraulic self-control. Background Art
[0002] The hydraulic automatic flap gate is a common gate in China. It has the functions of water storage and flood discharge. It operates under the action of upstream and downstream water pressure and its own weight. When the water level in front of the gate rises to the designed height, the gate opens to discharge water. When the water level in front of the gate drops to a certain position, the gate closes automatically to block water. The hydraulic automatic flap gate has a simple structure, low investment in maintenance and energy dissipation, high operational reliability, large discharge capacity and low waterlogging. Based on the above advantages, the flap gate is widely used in various small and medium-sized water conservancy projects such as spillways, hydropower stations and landscape projects. Especially in low-head dam projects in mountainous areas where floods are fierce and management and operation are inconvenient, its advantages are more prominent than rubber dams, gravity dams and other dams of the same scale, and it has a broad application prospect.
[0003] The slope of mountain rivers is large, the water flow is fast, the flood flow is large and carries a lot of sediment and floating objects. The task of the dam project in mountain rivers is not only to discharge flood water during high flow, but more importantly, to flush the sediment carried by the flood and the sediment deposited in front of the gate during low flow to the downstream and farther river channels behind the gate. After the hydraulic automatic flap gate is opened and operated, the gate flows through the upper and lower parts at the same time, which is conducive to the discharge of floating objects and bedload sediment.
[0004] The common hydraulic automatic flap gate is suitable for use in mountain rivers, but it still faces some engineering problems when it is used in mountain rivers, such as the gate is in a water-blocking state before it is opened, so that the water level in front of the gate rises, the sand-laden water flow has a reduced flow rate under the obstruction of the gate, and the sand-carrying force is reduced, so it is deposited at the bottom in front of the gate. The sedimentation will have a harmful effect on the flap gate. Summary of the invention
[0005] The present invention aims to overcome the deficiencies in the prior art and provides a damping sand-discharging flap gate based on hydraulic self-control.
[0006] This application provides the following technical solutions: A damping sand-discharging flap gate based on hydraulic automatic control is characterized in that it includes a groove-shaped main body, a retaining weir extending upward from one end of the main body, a flip gate plate is provided on the inner wall of the main body, the flip gate plate corresponds to the retaining weir, and a water injection area is formed between the flip gate plate, the retaining weir and the main body.
[0007] On the basis of the above technical solutions, there are also the following further technical solutions: The flip gate is L-shaped, comprising a longer section and a shorter end, one end of the shorter end being matched with the retaining weir.
[0008] The inner side wall of the retaining weir is provided with an arc surface corresponding to the flip gate plate.
[0009] A rotation damper is arranged on the rotating shaft of the flip gate.
[0010] Advantages of the invention: The present invention has a simple structure and is easy to use. The damping sand-discharging flap gate discharges water in a hydraulically self-controlled manner. Due to the existence of damping, the gate can be smoothly flipped over smoothly and without vibration regardless of whether the water level rises slowly or suddenly, so that the gate can avoid sudden overturning, frequent swinging and flapping, reduce the overall vibration of the engineering structure, and avoid gate damage; at the same time, silt, aquatic plants and other debris deposited at low water levels and low flow rates flow out under the action of various external forces. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION
[0012] like Figure 1 As shown, a damping sand release flap gate based on hydraulic self-control comprises a groove-shaped main body 1, and a support leg 1a is provided at the bottom of the main body 1. A retaining weir 2 extends upward from one end of the main body 1 and is distributed along its length direction.
[0013] A reversing gate plate 3 is connected to the main body 1 on one side of the retaining weir 2 by rotation. The reversing gate plate 3 is L-shaped, and includes a longer section a and a shorter end b. A rotary damper 5 is provided on the rotating shaft of the reversing gate plate 3. The maximum rotation angle of the reversing gate plate 3 controlled by the rotary damper 5 should not exceed 16-18 degrees, thereby ensuring the relative stability of the water flow, and satisfying that no funnel-type suction vortex appears in front of the water inlet and no negative pressure is generated in the water diversion channel.
[0014] One end of the shorter end b forms a watertight corresponding fit with the retaining weir 2. An arc surface 2a corresponding to the flip gate plate 3 is provided on the inner side wall of the retaining weir 2 so that the shorter end b can still form a watertight corresponding fit with the retaining weir 2 when rotating.
[0015] A water injection area 4 is formed between the reversible gate plate 3 , the retaining weir 2 and the main body 1 .
[0016] Device operation experiment: The main body is placed in the water pool 4, and a water inlet pipe 6 is inserted into the water injection area 4. A corresponding pump 6a is connected to the water inlet pipe 6 outside the main body 1. The simulated water is sent to the water injection area 4 by the pump 6a. As the water level in the water injection area 4, i.e., the longer section a of the flip gate 3, rises (the water level in front of the gate), when the moment of the water pressure on the rotating fulcrum is greater than the moment of the gate weight and frictional resistance on the rotating fulcrum (rotating shaft), the flip gate automatically opens to a certain inclination angle until the moment of the dynamic water pressure on the rotating fulcrum at this inclination angle is equal to the moment of the flip gate weight on the rotating fulcrum, and a new balance is achieved under this flow rate.
[0017] When the water flow rate of the water inlet pipe remains unchanged, the opening angle remains unchanged. When the upstream flow rate decreases to a certain extent, so that the torque of the weight of the flip gate on the rotating fulcrum is greater than the torque of the dynamic water pressure and friction resistance on the fulcrum, the hydraulic automatic flap gate can automatically return to a certain inclination angle to achieve a new balance under this flow rate. When silt and debris accumulate on the flip gate 3, it will affect the normal flow area. At this time, under the action of gravity, water pressure, etc., the damper of the rotating shaft rotates a certain angle, and the silt flows out from the gap between the gate leaves.
[0018] Experimental data:
[0019] In order to eliminate the influence of water flow fluctuation on the experiment, the pump was turned on to the minimum during the experiment, and a water-blocking glass plate was set at the inlet of the pump to ensure that the experimental water had a constant hydrostatic pressure; the model flow rate was calculated and determined based on the design flow rate of the pump. The design flow rate of the model is 6000L / h, and the maximum experimental flow rate is equal to 1.1 times the design flow rate.
[0020] Repeated tests have shown that the gate can be turned smoothly and without vibration when the upstream water volume increases gradually and the water level rises gradually, or when the flow rate increases suddenly and the water level rises rapidly. The opening and closing of the gate is only related to the water level. When the water level reaches the designed water level, the torque generated by the water pressure in the direction of the water flow on the rotating shaft of the gate is equal to the reverse torque of the water pressure at the bottom of the gate on the rotating shaft. At this time, the gate is in a balanced state, but due to the impact of the water flow, the torque generated in the direction of the water flow is slightly larger, causing the gate to turn over, the water flow passes, the water level drops, and the gate closes. This keeps the gate at a small rotation angle.
Claims
1. A damping sand-discharging flap gate based on hydraulic automatic control, characterized in that: It comprises a groove-shaped main body (1), a retaining weir (2) extending upward from one end of the main body (1), a flip gate (3) being provided on the inner wall of the main body (1), the flip gate (3) correspondingly cooperating with the retaining weir (2), and a water injection area (4) being formed between the flip gate (3), the retaining weir (2) and the main body (1).
2. According to the hydraulic automatic control damping sand release flap gate as described in claim 1, it is characterized by: The flip gate (3) is L-shaped and comprises a longer section and a shorter end, one end of the shorter end correspondingly fitting with the retaining weir (2).
3. According to the hydraulic automatic control damping sand release flap gate as described in claim 1, it is characterized by: The inner side wall of the retaining weir (2) is provided with a curved surface (2a) corresponding to the flip gate plate (3).
4. According to the hydraulic automatic control damping sand release flap gate as described in claim 1, it is characterized by: A rotation damper (5) is provided on the rotating shaft of the flip gate (3).