Gate flow-induced vibration damping protection method

Abstract

The invention discloses a gate flow-induced vibration damping protection method which is characterized in that when a gate generates flow-induced vibration, a power generation device is adopted to absorb kinetic energy of the flow-induced vibration and convert the kinetic energy into electric energy, so that impact of the flow-induced vibration on the gate is dissipated and converted more quickly, and the gate is protected. The safety threat of flow-induced vibration to the gate (valve) can be better reduced, underwater safety monitoring of the gate is facilitated, and the safety protection effect on the gate is better improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gate test equipment, and particularly relates to a method for reducing and protecting the flow-induced vibration of a gate. Background Technique

[0002] With the rapid development of water conservancy projects, hydropower facilities and industrial water supply systems, large gates (or valves), as key flow control devices, have increasingly complex application scenarios. Especially under extreme hydraulic conditions such as high water heads (e.g., reservoir flood discharge, high-pressure section of water conveyance corridors), the gate and valve structures are long-term subjected to the impact of high-speed water flow, and strong flow-induced vibration phenomena are easily induced during this process. Flow-induced vibration refers to the phenomenon that when a fluid flows through a solid, due to the interaction between the fluid and the solid, the solid undergoes reciprocating motion. This kind of vibration not only changes the flow state of the fluid, but may also have a significant impact on the solid structure, and even lead to structural instability or damage.

[0003] When such vibrations occur on the gate (valve), it will not only cause fatigue damage, seal failure and even structural fracture of the gate and valve body and connecting components, but may also trigger chain safety hazards, threatening the safe operation of the overall water conservancy facilities. At present, for how to reduce the harm of flow-induced vibration to the gate, there are the following patents. For example, a structure for avoiding flow-induced vibration when a plane gate is partially opened, disclosed in CN202022065685.1, a dam for reducing the flow-induced vibration of a gate, disclosed in CN201620344333.0, and an intelligent avoidance method and system for the flow-induced vibration of a sluice, disclosed in CN202211552751.5.

[0004] The above-mentioned existing patented technologies for preventing and controlling the flow-induced vibration of gates and valves mainly rely on structural optimization design or optimization in scheduling. Although they can partially alleviate the structural vibration, the benefits are minimal, and the effective utilization of vibration energy is not considered. At the same time, the health monitoring of high-head gates and valves faces severe challenges: traditional monitoring equipment needs to rely on cable power supply or regular battery replacement, and the parts that need to be key monitored for high-head gates and valves are mostly located underwater or in enclosed environments such as water conveyance corridors. The wiring cost is high, the maintenance difficulty is large, and the problems such as short battery life and inconvenient replacement for battery power supply lead to the difficulty in realizing long-term real-time monitoring. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned existing technologies, the technical problem to be solved by the present invention is: how to provide a method for reducing and protecting the flow-induced vibration of a gate that can better reduce the safety threat of flow-induced vibration to the gate (valve), and further facilitate the realization of underwater safety monitoring of the gate, so as to better improve the safety protection effect of the gate.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A vibration reduction and protection method for gate flow-induced vibration, characterized in that when the gate generates flow-induced vibration, a power generation device is used to absorb the kinetic energy of the flow-induced vibration and convert it into electrical energy, so as to more quickly dissipate and convert the impact of the flow-induced vibration on the gate and achieve the protection of the gate.

[0007] In this way, in this method, by converting the kinetic energy of the flow-induced vibration into electrical energy for absorption and utilization, the safety risk of the flow-induced vibration to the gate protection is effectively reduced, and the safety protection effect on the gate is improved. The gate described in the solution generally refers to a plate-shaped member that realizes water blocking and water stopping in gates, valves and other devices used for water flow cut-off control in water conservancy projects, hydropower facilities and industrial water supply systems.

[0008] Furthermore, an underwater sensor is installed on the gate. The underwater sensor includes at least one of a pressure sensor, a vibration acceleration sensor and a cavitation sensor. The electrical energy converted from the flow-induced vibration is used to supply power to the underwater sensor to realize the safety monitoring of the gate.

[0009] In this way, a "vibration reduction - power generation - monitoring" closed loop is realized. The solution of the present application not only improves the safety of the gate and valve structures, but also solves the problem of power supply for underwater monitoring equipment, providing sustainable technical support for the intelligent and unmanned operation and maintenance of high-head gate valves.

[0010] Furthermore, this method is realized by using a gate device. The gate device includes a front gate plate and a rear gate plate, and criss-cross connecting ribs fixed between the front gate plate and the rear gate plate. A damping and vibration reduction device is also installed in the cavity between the front gate plate and the rear gate plate separated by the connecting ribs. The damping and vibration reduction device includes a damping block located between the front gate plate and the rear gate plate. Both ends of the damping block are respectively abutted against the front gate plate and the rear gate plate through damping springs. A brushless DC generator device is also fixedly arranged on the damping block. In the brushless DC generator device, the main shaft of the brushless DC generator body is drivingly connected with a horizontally arranged input roller, and one side of the circumferential side of the input roller is abutted against a friction guide rail horizontally fixed between the front gate plate and the rear gate plate.

[0011] In this way, when the gate is impacted by water flow and generates flow-induced vibration, the gate swings back and forth in the horizontal direction. Both ends of the damping block are supported by the damping springs against the front gate plate and the rear gate plate, and remain unchanged under the action of its own inertia after the vibration occurs, thereby causing the damping springs to generate back-and-forth compression and stretching oscillations, and converting the kinetic energy into internal energy to dissipate. The brushless DC generator device is installed on the damping block and forms a part of the damping to improve the damping effect. At the same time, the brushless DC motor itself can drive the generator main shaft to rotate to generate electricity by relying on the cooperation between the input roller and the friction guide rail, directly converting part of the kinetic energy into electrical energy, further improving the conversion efficiency of the vibration kinetic energy and improving the vibration reduction effect on the gate.

[0012] Current existing flow-induced vibration power generation devices and their related patented products mostly focus on the fields of ocean engineering and wind power generation. A typical example is the flow-induced vibration energy harvesting scheme around a cylinder. The core of its design lies in inducing large-amplitude vibrations through the flow around a bluff body to maximize the capture of the energy generated by the vibrations. However, there are essential differences between such schemes and the scenarios of water conservancy facilities. That is, the flow-induced vibrations generated by water conservancy gates and valves under high water heads belong to harmful structural responses and need to be suppressed rather than amplified. If traditional technologies are directly transplanted to the gate and valve scenarios, not only can the problem of vibration hazards not be solved, but the risk of structural damage may be exacerbated due to the pursuit of large-amplitude power generation. Therefore, in response to this technical pain point, the applicant proposed the device solution of this application, innovatively integrating the functions of damping vibration reduction and energy harvesting into one. The power generation device is coupled to the damping block to make itself a part of the damping, and while being able to effectively suppress flow-induced vibrations, it can further directly convert part of the vibration mechanical energy into electrical energy, doubling the effect of the conversion of vibration kinetic energy and better reducing the impact and harm of flow-induced vibrations on the gate.

[0013] Furthermore, the damping spring is a helical spring arranged in the horizontal direction and sleeved outside the telescopic rod. In this way, the stability of the spring action can be better ensured.

[0014] Furthermore, the damping spring and the telescopic rod inside it are in multiple groups and are symmetrically installed on the front and rear sides of the damping block. In this way, the stability of the spring action can be better ensured.

[0015] Furthermore, one end of the damping spring and the telescopic rod inside it that deviates from the damping block is installed on a mounting plate, and the mounting plate abuts between the front gate plate and the rear gate plate. This is more convenient for installation and setting.

[0016] Furthermore, the input roller is installed on an input shaft. The input shaft is arranged parallel to the main shaft of the brushless DC generator body. One end of the input shaft is installed with a forward rotation ratchet pawl. The forward rotation ratchet pawl and a forward rotation ratchet disc arranged coaxially form a forward rotation one-way transmission fit. The outer ring of the forward rotation ratchet disc is provided with external teeth and forms a forward rotation driving gear. The forward rotation driving gear meshes with a first driven gear installed on the main shaft of the brushless DC generator body; the other end of the input shaft is installed with a reverse rotation ratchet pawl. The reverse rotation ratchet pawl and a reverse rotation ratchet disc arranged coaxially form a reverse rotation one-way transmission fit. The outer ring of the reverse rotation ratchet disc is provided with external teeth and forms a reverse rotation driving gear. The reverse rotation driving gear meshes with an intermediate gear, and the intermediate gear meshes with a second driven gear installed on the main shaft of the brushless DC generator body.

[0017] In this way, when the input roller rolls back and forth along the friction guide rail, during forward rotation, the forward rotation ratchet pawl and the coaxially arranged forward rotation ratchet wheel form a forward rotation one-way transmission fit. The first driven gear and the main shaft are driven to rotate through the forward rotation driving gear, realizing power generation. At this time, there is a non-transmitting slipping idle running fit between the reverse rotation ratchet pawl and the reverse rotation ratchet wheel. When the input roller rolls in the reverse direction, the reverse rotation ratchet pawl and the coaxially arranged reverse rotation ratchet wheel form a reverse rotation one-way transmission fit. The intermediate gear is driven to rotate through the reverse rotation driving gear, and then after the rotation direction is reversed by the intermediate gear, the second driven gear and the main shaft are driven to continue rotating in the same direction, realizing continuous power generation. At this time, there is a non-transmitting slipping idle running fit between the forward rotation ratchet pawl and the forward rotation ratchet wheel. Therefore, the above structure realizes the continuity and stability of the electric energy conversion effect during the back-and-forth rolling process of the input roller.

[0018] Furthermore, the brushless DC generator device is installed at one end of an installation box. The main shaft, the input shaft and their components are installed in the inner cavity at the other end of the installation box. One side of the input roller is exposed from the opening on one side of the inner cavity of the installation box and is used for fitting with the friction guide rail. The installation box is fixed on the inner cavity wall of the damping block.

[0019] In this way, it is more convenient to assemble the components of the brushless DC generator device and its corresponding transmission structure, and the structure is made more compact and reliable.

[0020] Furthermore, the damping block is in a box-shaped structure. The friction guide rail horizontally penetrates through the damping block. The generator is fixed in the inner cavity of the damping block. Elastic rings are arranged at the positions where the two sides of the damping block are penetrated by the friction guide rail and are elastically matched with the friction guide rail.

[0021] In this way, the structure is more stable and reliable. The elastic rings arranged between the damping block and the friction guide rail can provide elastic force to apply a certain pressing force after the input roller is fitted with the friction guide rail, ensuring the rolling power generation conversion effect of the input roller on the friction guide rail. During implementation, damping liquid can further be filled and arranged in the installation cavity outside the damping block, and further relying on the damping effect, the kinetic energy of vibration is converted into internal energy and dissipated.

[0022] Furthermore, multiple brushless DC generator devices are installed in the inner cavity of the damping block. It can better realize current conversion.

[0023] Furthermore, a plurality of mass blocks are also installed and fixed in the inner cavity of the damping block.

[0024] In this way, the quality of the damping block can be better improved, making it maintain greater inertia, generating a greater damping vibration reduction effect while better improving the electric energy conversion effect; at the same time, the mass blocks can better balance the center of gravity of the damping block, ensuring that the center of gravity of the damping block is in the middle position to better ensure the overall stability of the device.

[0025] Furthermore, the damping and vibration reduction device is installed at the lower end position between the front gate plate and the rear gate plate. This position is the position where the flow excitation is the greatest, which can better improve the vibration reduction effect.

[0026] Furthermore, the power output end of the brushless DC generator device is externally connected with a charging wire. The charging wire penetrates through the damping block in a sealed manner and is connected to a storage battery installed on the gate to form a charging circuit. The power output end of the storage battery is respectively connected to and powers an underwater sensor and a signal transceiver module installed on the gate through power lines. The underwater sensor includes a pressure sensor, a vibration acceleration sensor, and a cavitation sensor installed on the gate and is respectively connected to the signal transceiver module.

[0027] In this way, the power generated by the generator can be directly used to supply power to the sensors on the gate, forming a signal acquisition and monitoring system to monitor the hydraulic impact situation of the gate, realizing a "vibration reduction - power generation - monitoring" closed loop, and better improving the protection of the gate. It not only enhances the safety of the gate and valve structure, but also solves the problem of power supply for underwater monitoring equipment, providing sustainable technical support for the intelligent and unmanned operation and maintenance of high - head gate valves.

[0028] Furthermore, a dynamic pressure sensor is installed on the outer side of the gate to monitor the water flow impact pressure; an acceleration sensor is arranged at the arm inside the gate valve to measure the three - dimensional vibration acceleration; a cavitation sensor is installed outside the gate valve to detect cavitation collapse events through high - frequency sound signals (20~200 kHz). This can better ensure the detection effect of the sensors.

[0029] The present invention has the following innovative features: (1) It realizes the active capture and conversion of flow-induced vibration energy in the field of water conservancy projects for the first time. Aiming at the harmful vibration generated by the impact of high-speed water flow on high-head gate valves, the present invention innovatively proposes a "vibration dissipation - power generation integration" mechanism, upgrades the traditional passive energy-consuming damper to an energy negative entropy device, and directly converts the vibration energy into electrical energy through mechanical transmission, filling the technical gap in the recovery of flow-induced vibration energy in the field of water conservancy projects. (2) The tuned mass damper is deeply integrated with the power generation function. In the present invention, the tuned mass damper is integrated with the energy collection function, and the traditional damper is updated and upgraded. The first four-generator embedded tuned mass damper (TMD) structure is created, with four brushless DC generators integrated inside the damper, adopting a symmetric distributed layout. When the flow-induced vibration of the gate valve drives the mass block of the damper to reciprocate, the forward and reverse rotations of the input shaft are converted into the unidirectional rotation of the output shaft through the gear set and the bidirectional ratchet mechanism, maximizing the utilization rate of mechanical energy. (3) An underwater self-powered vibration reduction and power generation integrated device. The present invention adopts a titanium alloy waterproof cavity (IP68 standard) and a rubber composite insulation layer, which can withstand high-intensity water pressure and erosion by sand-laden water flow, extending the life of sensors in harsh underwater environments. A capacitor - lithium battery hybrid energy storage unit is built-in. The capacitor quickly stores transient vibration electrical energy, and the lithium battery provides a stable output, solving the problem of power supply fluctuations caused by intermittent vibrations. It is deployed without cables, and through self-powered energy supply, it completely gets rid of the cable dependence of traditional underwater monitoring equipment, reducing the operation and maintenance cost by more than 90%.

[0030] In summary, the present invention can better reduce the safety threat of flow-induced vibration to the gate (valve), is conducive to realizing the underwater safety monitoring of the gate, and better improves the safety protection effect of the gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional structural schematic diagram of the damping and vibration reduction device adopted in the preferred embodiment of the present invention.

[0032] Figure 2 It is Figure 1 a schematic diagram of the structure after removing the gate in

[0033] Figure 3 It is Figure 1 the front view of

[0034] Figure 4 It is Figure 3 a schematic diagram of a single damping block and a friction guide rail in

[0035] Figure 5 It is Figure 4 a schematic diagram of the structure of a single brushless DC generator device in

[0036] Figure 6 It is Figure 5Schematic diagram of the structure of the brushless DC generator device after removing the mounting box.

[0037] Figure 7 for Figure 6 A schematic diagram of the structure of the brushless DC generator device without the brushless DC generator body. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with specific implementation modes.

[0039] Preferred implementation: A method for damping and protecting gate flow-induced vibration, which is characterized in that when the gate generates flow-induced vibration, a power generation device is used to absorb the kinetic energy of the flow-induced vibration and convert it into electrical energy, so as to dissipate and convert the impact of the flow-induced vibration on the gate more quickly, thereby achieving protection of the gate.

[0040] In this way, the method converts the kinetic energy of flow-induced vibration into electrical energy for absorption and utilization, effectively reducing the safety risk of flow-induced vibration to gate protection and improving the safety protection effect of gates. The gate described in the scheme generally refers to a plate-like component used in water conservancy projects, hydropower facilities and industrial water supply systems to block water and control water flow in devices such as gates and valves to achieve water blocking and water stopping.

[0041] Wherein, an underwater sensor is installed on the gate, and the underwater sensor includes at least one of a pressure sensor, a vibration acceleration sensor and a cavitation sensor. The electric energy converted from flow-induced vibration is used to power the underwater sensor to achieve safe monitoring of the gate.

[0042] In this way, a closed loop of "vibration reduction-power generation-monitoring" is realized. This application scheme not only improves the safety of the gate and valve structure, but also solves the energy supply problem of underwater monitoring equipment, and provides sustainable technical support for the intelligent and unmanned operation and maintenance of high-head gate valves.

[0043] Among them, this method is implemented by a gate device, see Figures 1-7 , Figure 1 Only part of the gate structure where the damping and vibration reduction device is located is shown schematically, the gate device includes a front gate plate 1 and a rear gate plate 2, and criss-cross connecting ribs 3 fixed between the front gate plate 1 and the rear gate plate 2, and a damping and vibration reduction device is also installed in the cavity between the front gate plate 1 and the rear gate plate 2 separated by the connecting ribs 3, the damping and vibration reduction device includes a damping block 4 located between the front gate plate and the rear gate plate, the two ends of the damping block 4 are respectively abutted against the front gate plate and the rear gate plate through a vibration reduction spring 5, and a brushless DC generator device is also fixedly arranged on the damping block 4, in the brushless DC generator device, the main shaft 7 of the brushless DC generator body 6 is transmission-connected with a horizontally arranged input roller 8, and one side of the circumferential side of the input roller 8 abuts against a friction guide rail 9 horizontally fixed between the front gate plate and the rear gate plate.

[0044] In this way, when the gate is impacted by the water flow and generates flow-induced vibration, the gate swings back and forth in the horizontal direction, and the two ends of the damping block are supported on the front gate plate and the rear gate plate by the damping spring. After the vibration occurs, it remains unchanged under the action of its own inertia, which in turn causes the damping spring to produce back and forth compression and tension oscillations, converting kinetic energy into internal energy and dissipating it. The brushless DC generator device is installed on the damping block, forming a part of the damping to improve the damping effect. At the same time, the brushless DC motor itself can rely on the cooperation between the input roller and the friction guide rail to drive the generator main shaft to rotate to generate electricity, directly converting part of the kinetic energy into electrical energy, further improving the conversion efficiency of vibration kinetic energy, and improving the vibration reduction effect on the gate.

[0045] The existing flow-induced vibration power generation devices and their related patented products are mostly focused on the fields of marine engineering and wind power generation, such as the cylindrical flow-induced vibration energy collection scheme, the core of which is to induce large vibrations through the flow around the blunt body to maximize the capture of vibration energy. However, there is an essential difference between this type of scheme and the water conservancy facility scenario, that is, the flow-induced vibration generated by the water conservancy gate and valve under high water head is a harmful structural response, which needs to be suppressed rather than amplified. If the traditional technology is directly transplanted to the gate and valve scenario, it will not only fail to solve the vibration hazard problem, but may also increase the risk of structural damage due to the pursuit of large-amplitude power generation. Therefore, the applicant has proposed the device scheme of this application to address this technical pain point, which innovatively integrates damping vibration reduction and energy collection functions. The power generation device is coupled to the damping block so that it itself constitutes a part of the damping, and can further directly convert part of the vibration mechanical energy into electrical energy while efficiently suppressing the flow-induced vibration, which doubles the effect of vibration kinetic energy conversion and better reduces the impact and harm of flow-induced vibration on the gate.

[0046] The damping spring 5 is a coil spring arranged in the horizontal direction and sleeved outside the telescopic rod 10. In this way, the stability of the spring action can be better guaranteed.

[0047] The damping spring 5 and the telescopic rod 10 therein are multiple groups and are symmetrically mounted on the front and rear sides of the damping block. In this way, the stability of the spring action can be better guaranteed.

[0048] The damping spring and the end of the telescopic rod therein which is away from the damping block are mounted on a mounting plate 11, and are abutted between the front gate plate and the rear gate plate by the mounting plate 11. This makes installation and setting more convenient.

[0049] As described above, the input roller 8 is mounted on an input shaft 12. The input shaft is arranged in parallel with the main shaft 7 of the brushless DC generator body. One end of the input shaft 12 is provided with a forward rotation pawl 13. The forward rotation pawl 13 and a coaxially arranged forward rotation ratchet wheel disc 14 form a forward rotation one-way transmission fit. The outer ring of the forward rotation ratchet wheel disc is provided with external teeth and forms a forward rotation driving gear 15. The forward rotation driving gear 15 meshes with a first driven gear 16 mounted on the main shaft of the brushless DC generator body. The other end of the input shaft is provided with a reverse rotation pawl 17. The reverse rotation pawl and a coaxially arranged reverse rotation ratchet wheel disc 18 form a reverse rotation one-way transmission fit. The outer ring of the reverse rotation ratchet wheel disc is provided with external teeth and forms a reverse rotation driving gear 19. The reverse rotation driving gear 19 meshes with an intermediate gear 20. The intermediate gear 20 meshes with a second driven gear 21 mounted on the main shaft of the brushless DC generator body.

[0050] In this way, when the input roller rolls back and forth along the friction guide rail, during forward rotation, the forward rotation pawl and the coaxially arranged forward rotation ratchet wheel disc form a forward rotation one-way transmission fit. The first driven gear and the main shaft are driven to rotate through the forward rotation driving gear, realizing power generation. At this time, the reverse rotation pawl and the reverse rotation ratchet wheel disc are in a non-transmitting slipping idle running fit. When the input roller rolls in the reverse direction, the reverse rotation pawl and the coaxially arranged reverse rotation ratchet wheel disc form a reverse rotation one-way transmission fit. The intermediate gear is driven to rotate through the reverse rotation driving gear. Then, after the rotation direction is reversed by the intermediate gear, the second driven gear and the main shaft are driven to continue rotating in the same direction, realizing continuous power generation. At this time, the forward rotation pawl and the forward rotation ratchet wheel disc are in a non-transmitting slipping idle running fit. Therefore, the above structure realizes the continuity and stability of the electric energy conversion effect during the back-and-forth rolling process of the input roller.

[0051] Among them, the brushless DC generator device is mounted at one end of a mounting box 22. The main shaft, the input shaft and their components are mounted in the inner cavity at the other end of the mounting box 22. One side of the input roller 8 is exposed from the inner cavity opening of the mounting box and is used for fitting with the friction guide rail. The mounting box is fixed on the inner cavity wall of the damping block.

[0052] In this way, it is more convenient for assembling the components of the brushless DC generator device and its corresponding transmission structure, and makes the structure more compact and reliable.

[0053] Among them, the damping block 4 is in a box-shaped structure. The friction guide rail 9 horizontally penetrates through the damping block 4. The generator is fixed in the inner cavity of the damping block. Elastic rings 24 are arranged at the positions where the two sides of the damping block 4 are penetrated by the friction guide rail and are elastically matched with the friction guide rail 9.

[0054] In this way, the structure is more stable and reliable. The elastic ring arranged between the damping block and the friction guide rail can provide elastic force to apply a certain pressing force after the input roller fits with the friction guide rail, ensuring the rolling power generation conversion effect of the input roller on the friction guide rail. During implementation, damping liquid can be further filled in the installation cavity outside the damping block to further convert the kinetic energy of vibration into internal energy and dissipate it through the damping effect.

[0055] Among them, a plurality of brushless DC generator devices are installed in the inner cavity of the damping block 4, which can better achieve current conversion.

[0056] Among them, a plurality of mass blocks 25 are also fixedly installed in the inner cavity of the damping block 4.

[0057] This can better improve the quality of the damping block, make it maintain greater inertia, produce a greater damping and vibration reduction effect, and at the same time better improve the power conversion effect; at the same time, the mass block can better balance the center of gravity of the damping block, ensure that the center of gravity of the damping block is in the middle position, so as to better ensure the overall stability of the device.

[0058] Among them, the damping and vibration reduction device is installed at the lower position between the front gate plate and the rear gate plate. This position is the position where the flow excitation is the largest, which can better improve the vibration reduction effect.

[0059] Among them, the power output end of the brushless DC generator device is externally connected to a charging wire. The charging wire penetrates through the damping block in a sealed manner and is connected to a storage battery 26 installed on the gate to form a charging circuit. The power output end of the storage battery is respectively connected to an underwater sensor 27 and a signal transceiver module 28 installed on the gate through power lines and supplies power to them. The underwater sensor includes a pressure sensor, a vibration acceleration sensor and a cavitation sensor installed on the gate and is respectively connected to the signal transceiver module.

[0060] In this way, the power generated by the generator can be directly used to supply power to the sensors on the gate, forming a signal acquisition and monitoring system to monitor the hydraulic impact situation of the gate, realizing a "vibration reduction - power generation - monitoring" closed loop, and better improving the protection of the gate. It not only improves the safety of the gate and valve structure, but also solves the problem of power supply for underwater monitoring equipment, providing sustainable technical support for the intelligent and unmanned operation and maintenance of high - head gate valves.

[0061] Among them, the dynamic pressure sensor is installed on the outer side of the gate to monitor the water flow impact pressure; the acceleration sensor is arranged at the arm inside the gate valve to measure the three - dimensional vibration acceleration; the cavitation sensor is installed outside the gate valve to detect cavitation collapse events through high - frequency sound signals (20 - 200 kHz). This can better ensure the detection effect of the sensor.

[0062] The sluice and valve flow-induced vibration energy harvesting and utilization device proposed in this patent addresses the dual problems of "vibration hazards" and "monitoring and power supply" in traditional technologies for complex scenarios such as high water heads, strong vibrations, and underwater sealed environments, and has the following broad application prospects: For the first time, the flow-induced vibration that endangers the structural safety in hydraulic engineering is converted into utilizable electric energy through a damper-generator coupling mechanism, achieving the simultaneous completion of "vibration reduction" and "power generation".

[0063] Traditional dampers only passively dissipate energy. This device converts harmful vibrations and converts the vibration mechanical energy into power supply for sensors. Four micro-generators are integrated inside the tuned mass damper (TMD), and the two-way capture of vibrations is achieved through a two-way ratchet mechanism, meeting the milliwatt-level continuous power supply requirements of underwater sensors.

[0064] Apply a variety of sensors to key parts such as the radial gates and flat gates of large reservoirs, and real-time monitor problems such as structural fatigue and seal failure caused by flow-induced vibration. There is no need to lay cables or frequently replace batteries, reducing the complex operation and maintenance costs in deep water, rapid flow, etc., and adapting to the intelligent upgrade requirements of "unattended" water conservancy facilities.

Claims

1. A vibration reduction and protection method for sluice flow-induced vibration, characterized in that, When the gate generates flow-induced vibration, a power generation device is used to absorb the kinetic energy of the flow-induced vibration and convert it into electrical energy, so as to dissipate and convert the impact of the flow-induced vibration on the gate more quickly and achieve protection for the gate.

2. The gate flow-induced vibration damping and protection method according to claim 1, characterized in that, An underwater sensor is installed on the gate, and the underwater sensor includes at least one of a pressure sensor, a vibration acceleration sensor and a cavitation sensor. The electric energy converted from flow-induced vibration is used to power the underwater sensor to achieve safe monitoring of the gate.

3. The gate flow-induced vibration damping and protection method according to claim 1, characterized in that, The method is implemented by a gate device, which includes a front gate plate and a rear gate plate, and criss-cross connecting ribs fixed between the front gate plate and the rear gate plate. A damping and vibration reduction device is also installed in the cavity between the front gate plate and the rear gate plate separated by the connecting ribs. The damping and vibration reduction device includes a damping block located between the front gate plate and the rear gate plate, and both ends of the damping block are respectively abutted against the front gate plate and the rear gate plate through a vibration reduction spring. A brushless DC generator device is also fixedly arranged on the damping block. In the brushless DC generator device, a horizontally arranged input roller is connected to the main shaft transmission connection of the brushless DC generator body, and one side of the circumferential side of the input roller abuts against a friction guide rail horizontally fixed between the front gate plate and the rear gate plate.

4. The gate flow-induced vibration damping and protection method according to claim 3, characterized in that, The damping spring is a coil spring arranged in the horizontal direction and sleeved outside the telescopic rod; The damping springs and the telescopic rods therein are multiple groups and are symmetrically installed on the front and rear sides of the damping block; The damping spring and the end of the telescopic rod therein which is away from the damping block are mounted on a mounting plate, and are abutted between the front gate plate and the rear gate plate by the mounting plate.

5. The gate flow-induced vibration damping and protection method according to claim 3, characterized in that, The input roller is installed on an input shaft, and the input shaft is arranged in parallel with the main shaft of the brushless DC generator body. A forward pawl is installed at one end of the input shaft, and the forward pawl and a coaxially arranged forward ratchet disk form a forward one-way transmission match, and the outer ring of the forward ratchet disk is provided with external teeth to form a forward driving gear, and the forward driving gear is meshed with a first driven gear installed on the main shaft of the brushless DC generator body; a reverse pawl is installed at the other end of the input shaft, and the reverse pawl and a coaxially arranged reverse ratchet disk form a reverse one-way transmission match, and the outer ring of the reverse ratchet disk is provided with external teeth to form a reverse driving gear, and the reverse driving gear is meshed with an intermediate gear, and the intermediate gear is meshed with a second driven gear installed on the main shaft of the brushless DC generator body.

6. The sluice flow-induced vibration damping and protection method according to claim 5, characterized in that, The brushless DC generator device is installed at one end of a mounting box, and the main shaft, input shaft and upper components thereof are installed in the inner cavity of the other end of the mounting box. One side of the input roller is exposed from an opening on one side of the inner cavity of the mounting box and is used to fit with the friction guide rail. The mounting box is fixed on the inner cavity wall of the damping block.

7. The method for reducing vibration and shock of the gate caused by flow excitation according to claim 3, characterized in that, The damping block is box-shaped, the friction rail is horizontally penetrated through the damping block, the generator is fixed in the inner cavity of the damping block, and elastic rings and friction rails are elastically matched at positions penetrated by the friction rails on both sides of the damping block.

8. The gate flow-induced vibration damping and protection method according to claim 7, characterized in that, A plurality of brushless DC generator devices are installed in the inner cavity of the damping block; A plurality of mass blocks are also installed and fixed in the inner cavity of the damping block.

9. The gate flow-induced vibration damping and protection method according to claim 3, characterized in that, The damping vibration reduction device is installed at the lower end position between the front gate plate and the rear gate plate.

10. The gate flow-induced vibration damping and protection method according to claim 3, characterized in that, The power output terminal of the brushless DC generator device is externally connected with a charging wire. The charging wire penetrates through the damping block in a sealed manner and is connected to a storage battery installed on the gate to form a charging circuit. The power output terminal of the storage battery is respectively connected to an underwater sensor and a signal transceiver module installed on the gate through power lines to supply power to them. The underwater sensor includes a pressure sensor, a vibration acceleration sensor, and a cavitation sensor installed on the gate, and is respectively connected to the signal transceiver module; The dynamic pressure sensor is installed on the outer side of the gate to monitor the water flow impact pressure; the acceleration sensor is arranged at the arm inside the gate valve to measure the three-dimensional vibration acceleration; the cavitation sensor is installed outside the gate valve to detect cavitation collapse events through high-frequency sound signals.

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