A water power station gate opening control device

Abstract

The utility model discloses a water power station gate opening degree control device relates to water power station gate technical field, including gate frame, gate board, water flow direction subassembly and gate vibration force reduction subassembly, wherein, water flow direction subassembly includes two fixed frame of symmetrical installation on gate frame, and there are a plurality of wing plates in the array of gate board front end between two fixed frame, every wing plate all has the multiple evenly distributed micro - pressure sensor of embedding, this design can carry out the decomposition of the vertical impact force water flow of gate board, significantly reduce the impact force that gate suffered, and through the cooperation of honeycomb's damping cavity and resonance hole, can greatly reduce structure vibration amplitude, effectively improve vortex vibration energy attenuation rate, prolong the fatigue life of gate, and cooperate the use of vibration isolator, can better reduce the vortex excitation vibration risk of gate board, improve the service life of gate.

Description

Technical Field

[0001] This utility model relates to the field of hydropower station gate technology, and in particular to a hydropower station gate opening control device. Background Technology

[0002] Currently, the gates face numerous critical issues during the opening and closing process of flowing water, which seriously affect their safe and stable operation:

[0003] Firstly, regarding water flow impact damage, high-speed water flow directly impacts the gate, especially when the gate is partially open. This impact is more pronounced and can easily cause structural vibration, with the vibration amplitude often exceeding 5mm. This can lead to fatigue cracks in the metal and shorten the service life of the gate.

[0004] Secondly, the risk of vortex-induced vibration should not be ignored. Periodic vortex shedding will occur at the rear of the gate, forming a vortex street. This phenomenon will cause resonance, accelerate the failure of the seals, and affect the sealing performance of the gate.

[0005] However, existing buffering solutions have obvious limitations. Fixed energy dissipation sills are only suitable for the gate when it is fully open or fully closed, and cannot function when the gate is partially open. Hydraulic dampers have a slow response time of more than 1 second, making it difficult to match the frequency of sudden changes in water flow, which is usually between 0.5-10Hz.

[0006] Therefore, this utility model provides a gate opening control device for hydropower stations. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a gate opening control device for hydropower stations, which solves the problems mentioned in the background.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a gate opening control device for a hydropower station, comprising a gate frame and a gate plate installed inside the gate frame, and further comprising:

[0009] The water flow guiding component is installed on the gate frame and located on the water-facing side at the front end of the gate plate, and is used to decompose and divert the vertical impact water flow.

[0010] The gate vibration reduction component is built into the gate plate and is used to reduce the vortex-induced vibration force on the gate plate.

[0011] The water flow guiding component includes two fixed frames symmetrically installed on the gate frame. Between the two fixed frames, at the front end of the gate plate, there are multiple wing plates, and each wing plate has multiple uniformly distributed miniature pressure sensors built into it.

[0012] As a further technical solution of this utility model, the water flow guiding assembly also includes a shaft connected to one end of each of the wing plates, and the two ends of the shaft are respectively rotatably connected to the two fixed frames;

[0013] A drive motor is mounted on the top mounting bracket corresponding to each shaft via a bracket, and the output end of the drive motor is fixed to the top of the shaft.

[0014] As a further technical solution of this utility model, the gate vibration reduction component includes a honeycomb damping cavity disposed on the backwater surface of the gate plate, and a plurality of resonance holes are uniformly opened in the cavity of the damping cavity, wherein the resonance holes are Helmholtz resonance holes.

[0015] As a further technical solution of this utility model, the resonant hole is filled with a viscoelastic material, and the viscoelastic material is a silicone compound.

[0016] As a further technical solution of this utility model, multiple vibration isolators are rectangularly distributed between the damping cavity and the gate plate, and the vibration isolators are rubber-metal composite vibration isolators.

[0017] As a further technical solution of this utility model, it also includes a PLC control system, which is used to receive the signal transmitted by the miniature pressure sensor and control the drive motor to rotate and adjust the wing plate. The PLC control system includes an edge computing module, a wireless communication module and a power supply module.

[0018] This utility model provides a gate opening control device for hydropower stations, which has the following advantages compared with the prior art:

[0019] 1. The gate opening control device of this hydropower station is designed with a water flow guiding component set on the front water-facing side of the gate plate, which can decompose and divert the vertical impact force of the water flow on the gate plate, significantly reduce the impact force on the gate, and effectively extend the service life of the gate plate.

[0020] 2. This design provides a gate opening control device for a hydropower station. A gate vibration reduction component is added to the backwater side of the gate plate. Through the combination of honeycomb damping cavities and resonance holes, and filled with viscoelastic material, the structural vibration amplitude can be significantly reduced, the vortex-induced vibration energy attenuation rate can be effectively improved, and the fatigue life of the gate can be extended. Moreover, in conjunction with the use of vibration isolators, the risk of vortex-induced vibration of the gate plate can be better reduced, and the service life of the gate can be improved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a gate opening control device for a hydropower station.

[0022] Figure 2 A schematic diagram of the water flow guiding component in a gate opening control device for a hydropower station;

[0023] Figure 3 A schematic diagram of the structure of a wing plate in a hydropower station gate opening control device;

[0024] Figure 4 This is a schematic diagram of the gate plate in a hydropower station gate opening control device.

[0025] In the diagram: 1. Gate frame; 2. Gate plate; 21. Damping cavity; 22. Resonance hole; 23. Vibration isolator; 3. Water flow guide assembly; 31. Fixing frame; 32. Wing plate; 33. Shaft; 34. Drive motor; 35. Miniature pressure sensor; Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-4 This utility model provides a technical solution for a hydropower station gate opening control device: a hydropower station gate opening control device, including a gate frame 1 and a gate plate 2 installed inside the gate frame 1. A gate opening and closing device for lifting the gate plate 2 is also provided at the top of the gate frame 1 to realize the opening and closing of the gate plate 2. The device adopts a conventional gate lifting device.

[0028] Furthermore, the control device also includes a water flow guiding component 3, installed on the gate frame 1 and located on the front water-facing side of the gate plate 2, for decomposing and diverting the vertical impact water flow. The water flow guiding component 3 includes two fixed frames 31 symmetrically installed on the gate frame 1, with multiple wing plates 32 arrayed between the two fixed frames 31 at the front end of the gate plate 2. The water flow guiding component 3 also includes a shaft 33 connected to one end of each wing plate 32, with both ends of the shaft 33 rotatably connected to the two fixed frames 31, allowing the wing plates 32 to... 2 can rotate around the shaft 33. The top fixed frame 31 has a drive motor 34 installed at each shaft 33 via a bracket. The output end of the drive motor 34 is fixed to the top of the shaft 33. The drive motor 34 can drive the shaft 33 to rotate, thereby driving the wing plate 32 to rotate and adjust the angle. The adjustment range is ±30° and the adjustment accuracy is ±0.5°. Each wing plate 32 has multiple evenly distributed miniature pressure sensors 35 built in, which are used to monitor the local impact force on the wing plate in real time and transmit the signal to the PLC control system.

[0029] Furthermore, the guiding and shock-reducing principle of the water flow guiding component 3 is as follows:

[0030] The deflection angle α of the wing plate 32 and the angle of attack β of the water flow satisfy α=k·β, where k is the flow splitting coefficient. Through this angular relationship, the water flow is separated tangentially along the wing plate 32, thereby reducing the normal impact force.

[0031] Its calculation formula is: F⊥=F0·sin 2 β;

[0032] F0 represents the initial impact force. The array of wing plates 32 monitors the local impact force through a miniature pressure sensor 35. After receiving the signal, the PLC control system controls the drive motor 34 to adjust the deflection angle of the wing plates 32 with an accuracy of ±0.5°, thereby achieving active reduction of the impact force of the water flow.

[0033] It also includes a gate vibration reduction component, which is built into the gate plate 2 to reduce the vortex-induced vibration force on the gate plate 2. The gate vibration reduction component includes a honeycomb damping cavity 21 set on the backwater surface of the gate plate 2, which constitutes the main part of the gate vibration reduction component. Multiple resonance holes 22 are evenly opened in the cavity of the damping cavity 21. The resonance holes 22 are Helmholtz resonance holes. The resonance holes 22 are filled with silicone composite material as viscoelastic material. Multiple vibration isolators 23 are rectangularly distributed between the damping cavity 21 and the gate plate 2. The vibration isolators 23 are rubber-metal composite vibration isolators to further enhance the vibration reduction effect.

[0034] Furthermore, the principle of vortex-induced vibration suppression is as follows:

[0035] The formula for calculating the resonant frequency fh of a Helmholtz resonant aperture is:

[0036] Where c is the speed of sound, A is the cross-sectional area of ​​the aperture, V is the cavity volume, and L is the aperture length; f is set close to the vortex shedding frequency to dissipate energy.

[0037] By designing the resonant frequency fh close to the vortex shedding frequency, when vortex-induced vibration occurs, the viscoelastic material in the resonant hole will convert the vibration energy into heat energy. At the same time, the honeycomb damping cavity 21 disrupts the vortex shedding frequency. Combined with the effect of the rubber-metal composite vibration isolator 23, vortex-induced vibration is effectively suppressed.

[0038] It also includes a PLC control system, which is electrically connected to the miniature pressure sensor 35 and the drive motor 34 respectively. The power supply module included in the PLC provides power to the entire system. The wireless communication module enables wireless data transmission, facilitating remote monitoring and data interaction. The edge computing module runs a simplified CFD model and calculates and controls the drive motor 34 to rotate the wing plate 32 to the optimal angle based on the real-time signal transmitted by the miniature pressure sensor 35 and other relevant parameters (such as flow velocity, water level difference, opening degree, etc.), thereby achieving active reduction of the impact force of the water flow. When the transient impact force is detected to exceed the set threshold, the edge computing module triggers the emergency avoidance mode and controls the gate opening and closing device to raise the gate plate 2 by 2cm within 0.5 seconds to avoid the gate being subjected to excessive impact.

[0039] Furthermore, the edge computing module of the PLC control system runs a pre-trained simplified model based on computational fluid dynamics (CFD) to establish an impact force mapping function:

[0040] Fmax = G(U,H,θ), where U is the flow velocity, H is the water level difference, and θ is the opening degree;

[0041] By inputting real-time parameters such as flow velocity, opening degree, and water level difference, the wing angle parameters are optimized using the gradient descent method, and the optimal wing angle combination is output to achieve predictive control of water flow impact. When the transient impact force exceeds the threshold, the emergency avoidance mode is automatically triggered, and the gate is raised by 2cm within 0.5 seconds.

[0042] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A gate opening control device for a hydropower station, comprising a gate frame (1) and a gate plate (2) installed inside the gate frame (1), characterized in that, Also includes: The water flow guiding component (3) is installed on the gate frame (1) and located on the front water-facing side of the gate plate (2) to decompose and divert the vertical impact water flow. The gate vibration reduction component is built into the gate plate (2) and is used to reduce the vortex-induced vibration force on the gate plate (2); The water flow guiding component (3) includes two fixed frames (31) symmetrically installed on the gate frame (1). Between the two fixed frames (31) located at the front end of the gate plate (2), there are multiple wing plates (32). Each wing plate (32) has multiple uniformly distributed micro pressure sensors (35) built into it.

2. The hydropower station gate opening control device according to claim 1, characterized in that, The water flow guiding assembly (3) also includes a shaft (33) connected to one end of each of the wing plates (32), and the two ends of the shaft (33) are respectively rotatably connected to the two fixing frames (31); A drive motor (34) is mounted on the top of the fixed frame (31) at each of the shafts (33) via a bracket, and the output end of the drive motor (34) is fixed to the top of the shaft (33).

3. The gate opening control device for a hydropower station according to claim 1, characterized in that, The gate vibration reduction component includes a honeycomb damping cavity (21) provided on the backwater side of the gate plate (2). Multiple resonance holes (22) are uniformly opened inside the damping cavity (21). The resonance holes (22) are Helmholtz resonance holes.

4. The gate opening control device for a hydropower station according to claim 3, characterized in that, The resonant hole (22) is filled with a viscoelastic material, and the viscoelastic material is a silicone compound.

5. The gate opening control device for a hydropower station according to claim 3, characterized in that, Multiple vibration isolators (23) are arranged in a rectangular shape between the damping cavity (21) and the gate plate (2), and the vibration isolators (23) are rubber-metal composite vibration isolators.

6. The gate opening control device for a hydropower station according to claim 1, characterized in that, It also includes a PLC control system, which receives the signal transmitted by the miniature pressure sensor (35) and controls the drive motor (34) to rotate the wing plate (32) for adjustment. The PLC control system includes an edge computing module, a wireless communication module and a power supply module.

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