CN222301390U - Magnetic negative-stiffness energy trap device for vibration reduction of power transmission line - Google Patents
Magnetic negative-stiffness energy trap device for vibration reduction of power transmission line Download PDFInfo
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- CN222301390U CN222301390U CN202421095295.0U CN202421095295U CN222301390U CN 222301390 U CN222301390 U CN 222301390U CN 202421095295 U CN202421095295 U CN 202421095295U CN 222301390 U CN222301390 U CN 222301390U
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- vibration reduction
- magnetic ring
- transmission line
- power transmission
- wire spring
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Abstract
The utility model discloses a magnetic negative stiffness energy trap device for vibration reduction of a power transmission line, which comprises a power transmission line, vibration reduction inhaul cables and a power transmission tower, wherein the power transmission line is suspended between the power transmission towers, the upper ends of the vibration reduction inhaul cables are connected with the power transmission line, the vibration reduction inhaul cables bypass a fixed pulley fixed on the power transmission tower, the lower ends of the vibration reduction inhaul cables are connected with the negative stiffness energy trap device, the negative stiffness energy trap device comprises a positive stiffness wire spring II, a steel bar, an inner magnetic ring, an outer magnetic ring, a positive stiffness wire spring I and a pre-tightening device, the lower ends of the vibration reduction inhaul cables are connected with the upper ends of the steel bar through the positive stiffness wire spring II, a plurality of round permanent magnets and an inner magnetic ring are arranged on the steel bar, and copper sleeves are arranged on the outer sides of the permanent magnets. The outer magnetic ring is arranged outside the inner magnetic ring, and the lower end of the steel bar is connected with the pre-tightening device through a positive stiffness wire spring I. The utility model has simple structure and low cost, fully utilizes the inherent space at the bottom of the power transmission tower, does not occupy external space resources, and can meet the functions of low-frequency vibration absorption and energy consumption vibration reduction.
Description
Technical Field
The utility model belongs to the technical field of overhead transmission lines, and particularly relates to a magnetic negative-stiffness energy trap device for vibration reduction of a transmission line.
Background
The overhead transmission line is a large-span flexible structure, and under the action of extreme environmental loads such as strong wind, earthquake, deicing and the like, the line can generate great low-frequency galloping, so that serious accidents such as interphase flashover tripping, hardware damage, even disconnection, tower inversion and the like are caused. The traditional anti-galloping vibration reduction measures such as the anti-galloping hammer and the detuned pendulum are developed aiming at a specific excitation mechanism, and the anti-galloping vibration reduction effect has great limitation. Aiming at the low-frequency galloping characteristic of the power transmission line, the utility model provides a novel magnetic negative-stiffness energy trap device with a low-frequency energy consumption vibration reduction function, which not only realizes the built-in installation of damping on the power transmission line, but also has the double galloping inhibition function of low-frequency energy consumption and flexible rope constraint.
Disclosure of Invention
In order to solve the technical problems, the utility model provides the magnetic negative stiffness energy well device for vibration reduction of the power transmission line, which has the advantages of simple structure, low cost and low frequency energy consumption vibration reduction function.
The technical scheme includes that the magnetic negative stiffness energy sink device for vibration reduction of the power transmission line comprises a power transmission line, vibration reduction inhaul cables and a power transmission tower, wherein the power transmission line is suspended between the power transmission towers, the magnetic negative stiffness energy sink device is characterized in that the upper ends of the vibration reduction inhaul cables are connected with the power transmission line, the vibration reduction inhaul cables bypass fixed pulleys on the power transmission tower, the lower ends of the vibration reduction inhaul cables are connected with the negative stiffness energy sink device, the negative stiffness energy sink device comprises positive stiffness line springs II, steel bars, permanent magnets, copper sleeves, an inner magnetic ring, an outer magnetic ring, positive stiffness line springs I and a pre-tightening device, the lower ends of the vibration reduction inhaul cables are connected with the upper ends of the steel bars through the positive stiffness line springs II, a plurality of round permanent magnets are arranged on the steel bars, gaps are reserved between the two adjacent permanent magnets, the same poles of the two permanent magnets are oppositely arranged, copper sleeves are arranged on the outer sides of the permanent magnets, the copper sleeves are fixed on the steel bars of the power transmission tower, an inner magnetic ring is fixedly arranged on the steel bars, the inner magnetic ring is arranged below the inner magnetic ring, the outer magnetic ring is arranged on the outer side of the inner magnetic ring, the inner magnetic ring is coaxial with the outer magnetic ring and the pre-tightening device, a gap is reserved between the inner magnetic ring and the outer magnetic ring, the steel ring is fixedly arranged on the steel rings, the steel bar through the positive stiffness line springs I and the pre-tightening device.
Further, the permanent magnet is coaxial with the copper sleeve.
Further, a plastic screw cap is arranged between two adjacent permanent magnets on the steel bar.
Furthermore, the joint of the vibration reduction inhaul cable and the power transmission line is treated by adopting a metal insulator.
The utility model has the following working principle that when a power transmission line vibrates, a vibration-reducing inhaul cable connected with the power transmission line can drive a steel rod in a vibration-reducing device to vibrate up and down, so that a permanent magnet fixed on the steel rod moves up and down in a copper sleeve, when the permanent magnet moves relatively with the copper sleeve, the copper sleeve is used as a conductor pipe to cut radial magnetic induction lines of the permanent magnet to generate induced current, namely electric vortex, and electric energy is finally converted into heat energy to be consumed due to the existence of resistance of the conductor pipe. The magnetic negative stiffness spring is connected in parallel with the positive stiffness wire spring I and the positive stiffness wire spring II, and the synthesized stiffness can take any small value, so that the vibrator frequency of the vibration damper can be low to match with the galloping frequency of the power transmission line, and the functional requirements of low-frequency vibration absorption and energy consumption vibration reduction of the vibration damper are met.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The utility model has simple structure and low cost, fully utilizes the inherent space at the bottom of the power transmission tower, and does not occupy external space resources.
(2) The vibration damper disclosed by the utility model can be used for transmitting the vibration energy of the transmission line through the vibration damper inhaul cable, so that the damping energy consumption vibration damper problem of a large-span flexible structure is effectively solved.
(3) The negative rigidity and the positive rigidity of the utility model are connected in parallel, and the synthetic rigidity can take any small value, so that the frequency of the steel bar can be low to match with the galloping frequency of the power transmission line, and the functional requirements of low-frequency vibration absorption and energy consumption vibration reduction of the steel bar are met.
(4) The utility model has the characteristics of typical low dynamic stiffness and high static stiffness, and solves the problems of overlarge deformation and insufficient stability caused by using a high-flexibility wire spring.
(5) According to the utility model, as the amplitude is increased, the negative stiffness of the magnetic spring is gradually reduced, while the positive stiffness of the wire spring is kept unchanged, and the total composite stiffness is increased in a nonlinear way along with the increase of the amplitude, so that the vibration damper has instantaneous resonance capturing and targeted energy transmission mechanisms.
Drawings
Fig. 1 is a structural diagram of the present utility model.
Fig. 2 is a block diagram of a negative stiffness energy well device of the present utility model.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in fig. 1-2, the utility model comprises a transmission tower 1, vibration damping guy wires 3 and a transmission line 2, the transmission line 2 being suspended between the transmission towers 1. The upper end of the vibration reduction inhaul cable 3 is connected with the power transmission line 2, and the connection part adopts insulation treatment and meets the electrical requirement. The damping inhaul cable 3 bypasses a fixed pulley 4 fixed on the power transmission tower 1, and the lower end of the damping inhaul cable 3 is connected with a negative stiffness energy trap device 5 at the bottom of the power transmission tower 1.
As shown in fig. 2, the magnetic negative stiffness energy well device 5 comprises a section steel 501 of a power transmission tower, a positive stiffness wire spring II502, a steel bar 503, a copper sleeve 504, an inner magnetic ring 509, an outer magnetic ring 508, a positive stiffness wire spring I511 and a pre-tightening device 512. The copper sleeve 504 is fixed on the section steel 501 of the power transmission tower through two clamps I507, the outer magnetic ring 508 is fixed on the section steel 501 of the power transmission tower through a clamp II510, and the pre-tightening device 512 is fixed on the section steel 501 of the power transmission tower through a clamp III 513. An outer magnet ring 508 is positioned below the copper sleeve 504 and a pretensioning device 512 is positioned below the outer magnet ring 508.
The lower end of the vibration reduction inhaul cable 3 is connected with the upper end of a steel rod 503 through a positive stiffness wire spring II502, the steel rod 503 is provided with a plurality of round permanent magnets 505 and an inner magnetic ring 509, a plastic nut 506 is arranged between two adjacent permanent magnets 505, and the two adjacent permanent magnets 505 are oppositely arranged in homopolar, so that repulsive force exists between the two adjacent permanent magnets 505. The outer side of the permanent magnet 505 is provided with a copper sleeve 504, and the permanent magnet 505 is coaxial with the copper sleeve 504. The inner magnetic ring 509 is positioned below the permanent magnet 505, the outer magnetic ring 508 is arranged outside the inner magnetic ring 509, the inner magnetic ring 509 is coaxial with the outer magnetic ring 508, and a gap is reserved between the inner magnetic ring 509 and the outer magnetic ring 508. The lower end of the steel bar 503 is connected with a pretensioning device 512 through a positive stiffness wire spring I511.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421095295.0U CN222301390U (en) | 2024-05-20 | 2024-05-20 | Magnetic negative-stiffness energy trap device for vibration reduction of power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421095295.0U CN222301390U (en) | 2024-05-20 | 2024-05-20 | Magnetic negative-stiffness energy trap device for vibration reduction of power transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222301390U true CN222301390U (en) | 2025-01-03 |
Family
ID=93963452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421095295.0U Active CN222301390U (en) | 2024-05-20 | 2024-05-20 | Magnetic negative-stiffness energy trap device for vibration reduction of power transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222301390U (en) |
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2024
- 2024-05-20 CN CN202421095295.0U patent/CN222301390U/en active Active
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