Water conveyance canal water flow vertical face wave absorbing device based on eddy current damping

Abstract

The device comprises a cross beam horizontally and fixedly arranged above a rectangular channel section of an aqueduct in the left-right direction, and the portions, on the left side and the right side of a flow guide pier, below the cross beam are each provided with a grating type eddy current damping wave absorbing assembly. A water surface fluctuation monitoring sensor is arranged in front of the cross beam in the aqueduct, a fluctuation signal processor and a PLC are arranged on the cross beam, and the signal output end of the water surface fluctuation monitoring sensor is connected with the signal input end of the PLC through the fluctuation signal processor. The signal output end of the PLC is connected with the signal input end of the grating type eddy current damping wave absorbing assembly. The aqueduct has the following advantages that vertical oscillation of water in the aqueduct is effectively restrained, the vertical amplitude of water surface waves is reduced, and oscillation waves are prevented from splashing out of the aqueduct, so that the effective water cross section of the aqueduct is increased, the flow capacity of the aqueduct is improved, and the aqueduct is safe, low in energy consumption, low in cost and easy to implement.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy projects, and particularly relates to a vertical water wave dissipation device for water conveyance channels based on eddy current damping. Background Art

[0002] In water conservancy facilities such as aqueducts and open water conveyance channels of large-scale water conveyance channels, due to unsteady flow conditions such as upstream and downstream water level changes, gate opening and closing, and pump station operation, derivative waves (such as gravity waves and oscillatory waves) are extremely likely to be generated. These fluctuations will not only cause the oscillatory waves to touch the upper tie beam of the aqueduct and splash out of the aqueduct, reducing the flow capacity of the aqueduct, but may also cause structural tremors, threatening the safety of the aqueduct. Moreover, existing technologies mostly rely on fixed structures (such as stilling basins and guide piers) or rigid materials to absorb energy, unable to dynamically adapt to changes in the fluctuation frequency, and having low energy dissipation efficiency for high-frequency waves.

[0003] There is no existing technology for an open channel wave suppression device that combines frequency modulation and damping enhancement and can dynamically adapt to complex hydraulic conditions. And existing technologies cannot actively adjust the natural frequency of the water body vibration system. When the frequency of the derivative waves caused by unsteady flow upstream and downstream approaches the natural frequency of the aqueduct water body, resonance is extremely likely to occur, exacerbating the fluctuation amplitude and resulting in a reduction in the flow capacity. Existing methods mostly increase the water flow friction through physical barriers (such as rigid baffles) or surface roughness (such as rough lining), but the damping coefficient is fixed and cannot be dynamically optimized according to working conditions such as wave amplitude and flow rate. Especially when dealing with large-amplitude fluctuations, it is difficult to suppress the overflow of water waves or structural tremors, resulting in a sharp increase in energy dissipation. Summary of the Invention

[0004] The purpose of the present invention is to provide a vertical water wave dissipation device for water conveyance channels based on eddy current damping, which has a scientific principle, can suppress vertical water surface fluctuations, ensure the safe operation of the aqueduct, and improve the flow capacity.

[0005] To achieve the above purpose, the present invention adopts the following technical scheme: A vertical water wave dissipation device for water conveyance channels based on eddy current damping, with the water flow direction in the aqueduct being from front to back. A guide pier is arranged in the middle of the rectangular channel section of the aqueduct along the water flow direction. It includes a cross beam horizontally fixed above the rectangular channel section of the aqueduct in the left-right direction. On both sides of the guide pier below the cross beam, a set of grid-type eddy current damping wave dissipation components are respectively arranged. A water surface fluctuation monitoring sensor is arranged in front of the cross beam in the aqueduct. A fluctuation signal processor and a PLC controller are arranged on the cross beam. The signal output end of the water surface fluctuation monitoring sensor is connected to the signal input end of the PLC controller through the fluctuation signal processor. The signal output end of the PLC controller is connected to the signal input end of the grid-type eddy current damping wave dissipation components.

[0006] Each set of grid-type eddy current damping and wave dissipation components includes two metal frames and two flat plate electromagnets. The two flat plate electromagnets are respectively fixed on the side walls of the rectangular channel section and the side walls of the guide pier. The two flat plate electromagnets are arranged corresponding to each other left and right. The two metal frames are arranged at intervals left and right between the two flat plate electromagnets. The upper and lower ends of the metal frames are respectively provided with upper vertical sliding rods and lower vertical sliding rods. Upper sliding holes for passing through the upper vertical sliding rods are formed in the cross beam. Vertical sleeves are embedded in the concrete at the bottom of the rectangular channel section. The lower vertical sliding rods extend into and are slidably connected to the vertical sleeves.

[0007] A support plate is arranged between the two metal frames. The upper and lower ends of the support plate are respectively fixedly connected to the ground of the cross beam and the bottom surface of the rectangular channel section.

[0008] The metal frame includes a rectangular cylinder that is transparent from front to back. At least one vertical grid plate parallel to the flat plate electromagnet is arranged inside the rectangular cylinder. The lower end of the upper vertical sliding rod is fixedly connected to the top surface of the rectangular cylinder. The upper end of the lower vertical sliding rod is fixedly connected to the bottom surface of the rectangular cylinder.

[0009] A limit cap located above the cross beam is arranged at the upper end of the upper vertical sliding rod. The outer diameter of the limit cap is larger than the diameter of the upper sliding hole.

[0010] The water surface fluctuation monitoring sensors adopt pressure sensors, vibration sensors, float sensors and photoelectric sensors.

[0011] Adopting the above technical solution, the working principle of the water surface wave elevation suppression technology of the present invention is as follows: Based on the eddy current damping technology that has been successfully applied in structural vibration reduction, the eddy current damping and wave dissipation components are designed and developed. When the water body in the aqueduct generates vertical oscillation due to non-constant derivative waves, the metal frame will cut the magnetic induction lines during the up and down reciprocating movement in the magnetic field formed after the two flat plate electromagnets are energized, generating eddy currents. The eddy currents form an induced magnetic field, causing the metal frame to be subjected to eddy current damping. The frame interacts with the up and down fluctuating water body, thereby generating a damping effect that hinders the up and down reciprocating movement of the water body. By precisely designing the structural parameters of the grid-type eddy current damping and wave dissipation components, such as shape, size, material, and the spacing between the grids, controlling the energizing current of the flat plate electromagnet, and then controlling the intensity of the eddy current, the intensity of the damping effect is accurately adjusted. Reasonably select the grid material to ensure that the energy dissipation caused by the conductor resistance can effectively form a damping effect to inhibit the reciprocating movement of the water body.

[0012] The specific working process of the present invention is as follows: The water surface fluctuation signal monitored by the water surface fluctuation sensor in the aqueduct is transmitted to the fluctuation signal processor. The fluctuation signal processor transmits the processed signal to the PLC controller. The PLC controller controls the switches of two flat electromagnets according to the strength of the signal to supply the corresponding current intensity. A magnetic field is generated between the two flat electromagnets. When the metal frame moves up and down reciprocally in the magnetic field formed after the two flat electromagnets are energized, it will cut the magnetic induction lines and generate eddy currents. The eddy currents form an induced magnetic field, causing the metal frame to be subjected to eddy current damping. The frame interacts with the up-and-down fluctuation of the water body, thereby generating a damping effect that hinders the up-and-down reciprocating movement of the water body and realizing the effective suppression of the water body fluctuation.

[0013] The setting of the upper vertical slide bar and the lower vertical slide bar not only blocks the impact force of the water flow, ensures the stability of the metal frame in the front-rear direction, but also has a guiding effect on the up-and-down movement process of the metal frame. Due to the self-weight of the metal frame, when the water body is not fluctuating, the limit cap plays a role in preventing the upper vertical slide bar from detaching from the cross beam.

[0014] The present invention develops a grid-type eddy current damping wave-dissipating component and, in combination with hydraulic model tests, determines the best way and parameters for setting the grid-type eddy current damping wave-dissipating component at key positions such as the inlet and outlet of the aqueduct, forming a complete technical solution for suppressing the vertical wave surface of the open channel water surface with vertical wave-dissipating and vibration-damping functions, and realizing the effective suppression of the vertical fluctuation of the water body in the aqueduct.

[0015] Two or more metal frames are arranged side by side left and right, which can improve the sensitivity of the up-and-down movement of a single metal frame during the actual wave-dissipating process.

[0016] Compared with the prior art, it has the following technical effects: 1) Improve the flow capacity: Effectively suppress the vertical oscillation of the water body in the aqueduct, reduce the vertical amplitude of the water surface, avoid the splashing and overflow of the oscillation wave out of the aqueduct, thereby increasing the effective water passing section of the aqueduct, improving the flow capacity of the aqueduct, and meeting the needs of tapping potential for capacity expansion and increasing the flow rate for operation.

[0017] 2) Ensure the safety of the aqueduct: Reduce the tremor of the aqueduct structure caused by the water body fluctuation, reduce the risk of structural damage, ensure the safe and stable operation of the aqueduct, and extend the service life of the aqueduct.

[0018] 3) High cost-effectiveness: Compared with the active control technology, the present invention has low energy consumption and low cost; at the same time, by improving the flow capacity and ensuring the safety of the aqueduct, significant economic and social benefits are generated.

[0019] 4) Easy to implement: This technology can be implemented without changing the existing hydraulic structure of the aqueduct. Only by setting a grid-type eddy current damping wave-dissipating component at the inlet and outlet of the aqueduct, it is convenient to promote and apply in the existing aqueduct projects. Description of the Drawings

[0020] Figure 1 is the top view of the present invention; Figure 2 is the front three-dimensional structure schematic diagram of the present invention; Figure 3 is Figure 2 the enlarged view of part A in Detailed implementation manner

[0021] As Figures 1-3 shown, the water surface wave elimination device for the vertical flow of water in the water conveyance channel based on eddy current damping of the present invention takes the water flow direction in the aqueduct as the front-to-back direction (as the arrow direction in Figure 1 ), a guide pier 2 is arranged in the middle of the rectangular channel section 1 of the aqueduct along the water flow direction, including a cross beam 3 horizontally fixed above the rectangular channel section 1 of the aqueduct in the left-right direction. A set of grid-type eddy current damping wave elimination components 4 are respectively arranged on the left and right sides of the guide pier 2 under the cross beam 3. A water surface fluctuation monitoring sensor 5 is arranged in front of the cross beam 3 in the aqueduct. A fluctuation signal processor 6 and a PLC controller 7 are arranged on the cross beam 3. The signal output end of the water surface fluctuation monitoring sensor 5 is connected to the signal input end of the PLC controller 7 through the fluctuation signal processor 6, and the signal output end of the PLC controller 7 is connected to the signal input end of the grid-type eddy current damping wave elimination component 4.

[0022] Each set of grid-type eddy current damping wave elimination components 4 includes two metal frames and two flat plate electromagnets 8. The two flat plate electromagnets 8 are respectively fixed on the side walls of the rectangular channel section 1 and the guide pier 2, and the two flat plate electromagnets 8 are arranged corresponding to each other left and right. The two metal frames are arranged at intervals left and right between the two flat plate electromagnets 8. An upper vertical sliding rod 9 and a lower vertical sliding rod 10 are respectively arranged at the upper and lower ends of the metal frame. An upper sliding hole for passing through the upper vertical sliding rod 9 is opened on the cross beam 3. A vertical sleeve is embedded in the concrete at the bottom of the rectangular channel section 1, and the lower vertical sliding rod 10 extends into and is slidably connected to the vertical sleeve.

[0023] A support plate 14 is arranged between the two metal frames, and the upper and lower ends of the support plate 14 are respectively fixedly connected to the ground of the cross beam 3 and the bottom surface of the rectangular channel section 1.

[0024] The metal frame includes a rectangular cylinder 11 that is transparent from front to back. At least one vertical grid plate 12 parallel to the flat plate electromagnet 8 is arranged inside the rectangular cylinder 11. The lower end of the upper vertical sliding rod 9 is fixedly connected to the top surface of the rectangular cylinder 11, and the upper end of the lower vertical sliding rod 10 is fixedly connected to the bottom surface of the rectangular cylinder 11.

[0025] A limit cap 13 located above the cross beam 3 is arranged at the upper end of the upper vertical sliding rod 9, and the outer diameter of the limit cap 13 is larger than the diameter of the upper sliding hole.

[0026] The water surface fluctuation monitoring sensor 5 adopts a pressure sensor, a vibration sensor, a float sensor and a photoelectric sensor.

[0027] The working principle of the water surface wave elevation suppression technology of the present invention is as follows: Based on the eddy current damping technology that has been successfully applied in structural vibration damping, an eddy current damping wave elimination component is designed and developed. When the water body in the aqueduct generates vertical oscillations due to non-constant derivative waves, the metal frame moves up and down reciprocally in the magnetic field formed after the two flat electromagnets 8 are energized, cutting the magnetic induction lines and generating eddy currents. The eddy currents form an induced magnetic field, causing the metal frame to be subjected to eddy current damping. The frame interacts with the water body that fluctuates up and down, thereby generating a damping effect that hinders the up and down reciprocating motion of the water body. By precisely designing the structural parameters of the grid-type eddy current damping wave elimination component 4, such as shape, size, material, and the spacing between the grids, etc., controlling the energizing current of the flat electromagnet 8, and then controlling the intensity of the eddy current, the intensity of the damping effect can be accurately adjusted. Reasonably select the grid material to ensure that the energy dissipation caused by the conductor resistance can effectively form a damping effect to inhibit the reciprocating motion of the water body.

[0028] The specific working process of the present invention is as follows: The water surface fluctuation signal monitored by the water surface fluctuation monitoring sensor 5 in the aqueduct is transmitted to the fluctuation signal processor 6. The fluctuation signal processor 6 transmits the processed signal to the PLC controller 7. The PLC controller 7 controls the switches of the two flat electromagnets 8 to supply corresponding intensities of current according to the strength of the signal. A magnetic field is generated between the two flat electromagnets 8. The metal frame moves up and down reciprocally in the magnetic field formed after the two flat electromagnets 8 are energized, cutting the magnetic induction lines and generating eddy currents. The eddy currents form an induced magnetic field, interacting with the up and down fluctuations of the water body, thereby generating a damping effect that hinders the up and down reciprocating motion of the water body, thus realizing the effective suppression of the water body fluctuation.

[0029] The setting of the upper vertical slide bar 9 and the lower vertical slide bar 10 not only blocks the impact force of the water flow, ensures the stability of the metal frame in the front and back directions, but also has a guiding effect on the up and down movement process of the metal frame. Due to the self-weight of the metal frame, when the water body is not fluctuating, the limit cap 13 plays a role in preventing the upper vertical slide bar 9 from detaching from the cross beam 3.

[0030] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; still can modify the present invention or make equivalent replacements, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. The vertical wave dissipation device for the water flow in the water conveyance channel based on eddy current damping, with the water flow direction in the aqueduct being from front to back, a guide pier is arranged along the water flow direction in the middle of the rectangular channel section of the aqueduct, and it is characterized in that: It includes a cross beam horizontally and fixedly arranged above the rectangular channel section of the aqueduct along the left - right direction. On both sides of the diversion pier under the cross beam, a set of grid - type eddy current damping wave - eliminating components are respectively arranged. In the aqueduct, a water surface fluctuation monitoring sensor is arranged in front of the cross beam. A fluctuation signal processor and a PLC controller are arranged on the cross beam. The signal output end of the water surface fluctuation monitoring sensor is connected to the signal input end of the PLC controller through the fluctuation signal processor. The signal output end of the PLC controller is connected to the signal input end of the grid - type eddy current damping wave - eliminating component.

2. The water flow vertical wave dissipation device for a water conveyance channel based on eddy current damping according to claim 1, wherein: Each set of grid - type eddy current damping wave - eliminating components includes two metal frames and two flat - type electromagnets. The two flat - type electromagnets are respectively fixedly arranged on the side wall of the rectangular channel section and the side wall of the diversion pier. The two flat - type electromagnets are arranged corresponding to each other left and right. The two metal frames are arranged at intervals left and right between the two flat - type electromagnets. An upper vertical sliding rod and a lower vertical sliding rod are respectively arranged at the upper and lower ends of the metal frame. An upper sliding hole for passing through the upper vertical sliding rod is opened on the cross beam. A vertical sleeve is embedded in the concrete at the bottom of the rectangular channel section. The lower vertical sliding rod extends into and is slidably connected to the vertical sleeve.

3. The water flow vertical wave dissipation device for a water conveyance channel based on eddy current damping according to claim 2, characterized in that: A support plate is arranged between the two metal frames. The upper and lower ends of the support plate are respectively fixedly connected to the ground of the cross beam and the bottom surface of the rectangular channel section.

4. The water flow vertical wave dissipation device for a water conveyance channel based on eddy current damping according to claim 2 or 3, characterized in that: The metal frame includes a rectangular cylinder body that is transparent from front to back. At least one vertical grid plate parallel to the flat - type electromagnet is arranged inside the rectangular cylinder body. The lower end of the upper vertical sliding rod is fixedly connected to the top surface of the rectangular cylinder body. The upper end of the lower vertical sliding rod is fixedly connected to the bottom surface of the rectangular cylinder body.

5. The water flow vertical wave dissipation device for a water conveyance channel based on eddy current damping according to claim 4, characterized in that: A limit cap located above the cross beam is arranged at the upper end of the upper vertical sliding rod. The outer diameter of the limit cap is larger than the diameter of the upper sliding hole.

6. The water flow vertical wave dissipation device for a water conveyance channel based on eddy current damping according to any one of claims 1-3, characterized in that: The water surface fluctuation monitoring sensor adopts a pressure sensor, a vibration sensor, a float sensor and an optoelectronic sensor.

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