A shock absorber for power transmission lines

Abstract

The application discloses a shock absorber for power transmission line and belongs to the technical field of transmission line fittings. The shock absorber comprises symmetrically arranged hammer heads, and the hammer heads are connected through steel strands. A lower wire clamp is fixedly arranged on the steel strand, and an upper wire clamp is arranged on the upper portion of the lower wire clamp. The hammer head is internally provided with a cavity portion, and the cavity portion is press-fitted with a first throttle plate, a second throttle plate and a third throttle plate in the axial direction of the hammer head. The first throttle plate is arranged on the side close to the steel strand, the third throttle plate is arranged on the outer end side of the hammer head, and the second throttle plate is arranged between the first throttle plate and the third throttle plate. The three-layer throttle plates are arranged in the hammer head, the throttle holes between the adjacent throttle plates are distributed in a staggered mode, and the cavity portion of the hammer head is filled with damping liquid. When the transmission line vibration drives the hammer head to swing, the damping liquid in the cavity portion reciprocally flows along with the hammer head vibration, an S-shaped turn-back throttling energy dissipation system is formed, and the shock absorption performance of the shock absorber is improved.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line hardware technology, specifically a vibration damper for power transmission lines. Background Technology

[0002] Overhead transmission lines are exposed to the outdoor environment for a long time. The continuous blowing of a light breeze will cause the conductors to vibrate at high frequency. The conductors and their fittings are subjected to alternating stress for a long time, which can easily lead to faults such as conductor strand breakage, wear and loosening of fittings, and corrosion and cracking of hanging points, which seriously threaten the safe operation of transmission lines.

[0003] Vibration dampers are core vibration reduction and protection hardware for power transmission lines. They dissipate the wind-induced vibration energy of overhead conductors through their own inertial vibration, effectively suppressing the amplitude of conductor vibration and ensuring the safe and stable operation of transmission lines. Currently, vibration dampers adopt an integrated clamping structure. The clamping area that is in direct contact with the overhead conductor is subjected to a combination of vibration friction, electrical corrosion, and outdoor environmental erosion for a long time, making it prone to irreversible damage such as wear, pitting, and rust. After local damage to the clamping part, the entire vibration damper is scrapped, and the recycling rate of metal components is extremely low. At the same time, traditional vibration dampers use a single set of rivet points to limit the steel wire. The multiple strands of binding steel wire are prone to stacking and uneven distribution. Under long-term wind-induced vibration conditions, the binding force of the steel wire continuously decreases, which can easily lead to problems such as loosening of the steel wire. In addition, the damping and vibration reduction structure of traditional vibration dampers has a single energy dissipation mode, low vibration energy attenuation efficiency, and limited overall vibration reduction and protection performance.

[0004] Patent CN119171366A discloses a vibration damper, which is mounted on a mounting component via a locking member. A first connecting member is located on one side of the mounting component, and a second connecting member is located on the other side. A first hammer head is located at the end of the first connecting member furthest from the mounting component, and a second hammer head is located at the end of the second connecting member furthest from the mounting component. By mounting the first hammer head on the first connecting member and the second hammer head on the second connecting member, the first and second hammer heads enable a uniform load distribution.

[0005] In the aforementioned patented solution, the connecting parts and the hammer body of the anti-vibration hammer adopt an integrated molding structure, which is not conducive to later disassembly and recycling; at the same time, the anti-vibration hammer relies on only a single damping structure to achieve vibration reduction and energy dissipation, the vibration reduction form is singular, and the overall vibration reduction effect is poor. Summary of the Invention

[0006] The purpose of this invention is to provide a vibration damper for power transmission lines, which solves the technical problems of existing vibration dampers, such as poor recyclability, unstable and easily loosened steel wire limit, single damping energy consumption, and poor vibration damping effect.

[0007] The objective of this invention can be achieved through the following technical solutions: A vibration damper for power transmission lines includes symmetrically arranged hammer heads, with two sets of hammer heads connected by steel strands. A lower clamp is fixedly mounted on the steel strands, and an upper clamp is provided above the lower clamp. The hammer heads have a cavity, and a first throttling plate, a second throttling plate, and a third throttling plate are press-fitted into the cavity along the axial direction of the hammer head. The first throttling plate is located near the steel strand, the third throttling plate is located on the outer end of the hammer head, and the second throttling plate is located between the first and third throttling plates. The first and third throttling plates have coaxially distributed first throttling holes, and the second throttling plate has a second throttling hole that is offset from the first throttling hole. The cavity is filled with a damping medium. When the vibration damper vibrates, the damping medium flows back and forth in the cavity of the hammer head to dissipate the energy of wind vibration.

[0008] Furthermore, the lower part of the lower clamp is a cylindrical sleeve structure, and the upper part is a straight plate structure. The upper part of the lower clamp has symmetrically distributed second through holes.

[0009] Furthermore, the lower clamp is provided with an upper clamp, the lower part of which is straight and the upper part is hook-shaped. A limiting groove is provided in the middle of the straight part of the lower clamp.

[0010] Furthermore, the lower part of the upper clamp is provided with a first through hole, and the first through hole and the second through hole are coaxially arranged. The upper clamp and the lower clamp are fixed by the cooperation of bolts and nuts.

[0011] Furthermore, the upper hook-shaped outer wall of the upper clamp is integrally formed with protruding rivets. The protruding rivets are set along the length of the upper clamp, protruding upwards, and there are two sets of protruding rivets, which are distributed parallel to each other and staggered. The protruding rivets are distributed at both ends of the upper clamp.

[0012] Furthermore, the steel wire is used to install the anti-vibration hammer body on the overhead conductor. The steel wire alternates between two sets of staggered rivet points, winding around the side wall of the rivet points in an S-shape.

[0013] Furthermore, the first, second, and third throttling plates are all circular in shape, and the first and second throttling orifices are all circular, waist-shaped, or oblong; the waist-shaped or oblong orifices are arranged along the swing direction of the vibration damper.

[0014] Furthermore, the damping medium is a damping fluid or vibrating particles.

[0015] Furthermore, when the damping medium is a damping fluid, the volume filling rate of the damping fluid is 85%-95%.

[0016] Furthermore, when the damping medium is vibrating particles, the particle size is 1mm-5mm, and the volume filling rate of the vibrating particles is 40%-60%.

[0017] The beneficial effects of this invention are: This invention features three layers of throttling plates inside the hammer head, with staggered throttling orifices between adjacent plates, and damping fluid filling the cavity of the hammer head. When the transmission line vibrates and causes the hammer head to swing, the damping fluid inside the cavity flows back and forth with the hammer head vibration, forming an S-shaped folding throttling energy dissipation system. Through multiple throttling, diffusion, and turbulent circulation cycles, the vibration energy is dissipated, thereby improving the vibration damping performance of the anti-vibration hammer.

[0018] 2. The present invention adopts a detachable upper and lower clamp structure, which allows for the replacement of worn and failed upper clamps separately without the need to replace the entire anti-vibration hammer, thereby improving its recycling rate and reducing the operation and maintenance cost of transmission lines.

[0019] 3. This invention sets two sets of staggered protruding rivets on the outside of the upper clamp, and with the S-shaped winding of the steel wire, it realizes the partitioning and uniform arrangement of multiple steel wires, reducing the situation of traditional steel wire winding and stacking and misaligned single-point fixing of the anti-vibration hammer; effectively improving the overall connection and gripping force of the conductor, clamp and steel wire, improving the vibration fatigue resistance and extending the service life of the anti-vibration hammer. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the shock-absorbing hammer head structure of the present invention; Figure 4 This is a schematic diagram of the connection between the upper and lower wire clamps of the present invention; Figure 5 This is a schematic diagram of the connection of the steel wire of the present invention; Figure 6 This is a detailed view of the location of the damping medium in Embodiment 1 of the present invention; Figure 7 This is a detailed structural drawing of the throttle plate of the present invention; Figure 8 This is a detailed diagram of the location of the damping medium in Embodiment 2 of the present invention.

[0021] In the diagram: 1. Overhead conductor; 2. Hammer head; 21. Cavity; 23. Vibrating particle; 24. First throttling plate; 241. First throttling orifice; 242. Second throttling orifice; 25. Second throttling plate; 26. Third throttling plate; 3. Upper clamp; 31. Limiting groove; 32. First through hole; 33. Rivet point; 34. Steel wire; 4. Lower clamp; 41. Bolt; 42. Second through hole; 43. Nut; 5. Steel strand. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: Please see Figure 1-4 As shown, a vibration damper for power transmission lines includes hammer heads 2, which are symmetrically distributed and connected by steel strands 5. A lower clamp 4 is installed on the steel strand 5, the lower part of which is cylindrical and the upper part is a straight plate. The lower part of the lower clamp 4 is integrally formed with the steel strand 5 through a multi-point stamping and riveting process; the upper part of the lower clamp 4 is provided with symmetrically distributed second through holes 42.

[0024] The lower clamp 4 is provided with an upper clamp 3. The lower part of the upper clamp 3 is straight, and the upper part is hook-shaped. The hook structure is adapted to the outer diameter of the overhead conductor 1, and can be stably suspended and clamped on the overhead conductor 1 to realize the hanging of the entire anti-vibration hammer. The lower straight plate of the upper clamp 3 has a limiting groove 31 in the middle. The size of the limiting groove 31 is matched with the size of the upper straight plate of the lower clamp 4.

[0025] The lower part of the upper clamp 3 is provided with a first through hole 32. The first through hole 32 and the second through hole 42 are coaxially arranged. The first through hole 32 and the second through hole 42 are fixed together by the cooperation of bolt 41 and nut 43.

[0026] During installation, the lower limiting groove 31 of the upper clamp 3 is inserted into the upper straight plate of the lower clamp 4. The limiting groove 31 and the straight plate cooperate to achieve insertion and positioning, limiting the lateral and circumferential relative displacement of the two. At this time, the first through hole 32 of the upper clamp 3 and the second through hole 42 of the lower clamp 4 automatically align and become coaxial. Then, the bolt 41 is inserted and locked with the nut 43, thus fastening the upper clamp 3 and the lower clamp 4 into one unit, completing the assembly of the clamp assembly. The upper clamp 3 is used to install on the overhead conductor 1. The contact surface between the upper clamp 3 and the overhead conductor 1 is prone to damage, which is not conducive to recycling.

[0027] Since the upper clamp 3 is the component that holds the overhead conductor 1, its conductor contact surface is subjected to vibration friction and electrical corrosion for a long time, and is prone to wear, pitting and other damage, which seriously affects the overall recycling of the vibration damper. By connecting the upper clamp 3 and the lower clamp 4 in a detachable manner, the recycling rate of the vibration damper is improved.

[0028] Please see Figure 5As shown, the upper hook-shaped outer wall of the upper part of the upper clamp 3 is integrally formed with a protruding rivet 33. The protruding rivet 33 is set along the length direction of the upper clamp 3. The protruding rivet 33 protrudes upward and there are two sets of protruding rivets 33. The two sets of protruding rivets 33 are distributed parallel to each other and staggered. The protruding rivets 33 are distributed at both ends of the upper clamp 3.

[0029] The anti-vibration hammer body is installed on the overhead conductor 1 by means of steel wire 34. The steel wire 34 alternates up and down between two sets of misaligned rivet points 33, and is wound in an S-shape around the side wall of the rivet points 33.

[0030] Multiple steel wires 34 are wrapped around the upper clamp 3 and the outside of the overhead conductor 1. Under the limiting action of the protruding rivet points 33 on the outer wall of the upper clamp 3, the multiple steel wires 34 are divided and constrained on the upper clamp 3, which reduces the stacking and overlapping of the multiple steel wires 34, and makes each steel wire 34 evenly distributed along the circumference and axial direction of the upper clamp 3, and the force distribution is balanced.

[0031] The steel wire 34 adopts an S-shaped winding layout, and each section of steel strand 5 is independently constrained by multiple sets of staggered rivet points 33, forming multiple decentralized clamping and fixing structures. This improves the overall connection and gripping strength and vibration fatigue resistance between the steel strand 5, the upper clamp 3 and the overhead conductor 1. It can effectively resist the alternating stress caused by the long-term reciprocating vibration of the overhead line in light wind, reduce the phenomenon of axial slippage of the steel strand 5 under wind vibration conditions, and extend the service life of the vibration damper.

[0032] Please see Figure 6-7 As shown, the hammer head 2 has a cavity 21 inside, and a first throttling plate 24, a second throttling plate 25 and a third throttling plate 26 are fixedly installed in the cavity 21. The first throttling plate 24, the second throttling plate 25 and the third throttling plate 26 are distributed along the axial direction of the hammer head 2.

[0033] The first throttling plate 24 is located on one side of the steel strand 5, and the third throttling plate 26 is located on one side of the outer end of the hammer head 2; the second throttling plate 25 is located between the first throttling plate 24 and the third throttling plate 26.

[0034] The first throttling plate 24, the second throttling plate 25, and the third throttling plate 26 are all circular in shape and are all press-fitted into the cavity 21 of the hammer head 2. The first throttling plate 24 and the third throttling plate 26 are provided with a first throttling hole 241, and the second throttling plate 25 is provided with a second throttling hole 242. The first flow orifice 241 and the second flow orifice 242 are both circular, waist-shaped or oblong. In this embodiment, only the circular type is shown. The waist-shaped or oblong types are arranged along the swing direction of the shock absorber. The first throttling orifice 241 on the first throttling plate 24 and the third throttling plate 26 are co-centered, and the second throttling orifice 242 is offset from the first throttling orifice 241.

[0035] The cavity 21 is filled with a damping medium. In this embodiment, the damping medium is a damping liquid. The volume filling rate of the damping liquid is 85%-95%. The volume filling rate is the ratio of the volume of the damping liquid at room temperature to the effective volume of the cavity 21. The effective volume is the net volume of the cavity 21 after deducting the volume occupied by the internal throttling plate. The first throttling orifice 241 and the second throttling orifice 242 are staggered, which reduces the straight flow channel of the damping fluid in the cavity of the hammer head 2 and forms an S-shaped zigzag flow trajectory, thus prolonging the flow path of the damping fluid and the energy consumption time.

[0036] The specific energy dissipation principle is as follows: When the transmission line vibrates and causes the hammer head 2 to swing, the damping fluid inside the cavity flows back and forth with the vibration of the hammer head 2. The damping fluid first passes through the first throttling hole 241 of the first throttling plate 24, and achieves the first pressure loss and flow velocity attenuation through throttling and contraction, dissipating most of the vibration kinetic energy. Then it enters the cavity between the first throttling plate 24 and the second throttling plate 25, where the damping fluid fully diffuses, mixes, and turbulently collides, further dissipating the residual vibration energy. After that, the damping fluid passes through the second throttling plate 25 and the third throttling plate 26 in sequence, repeating the multi-stage cycle process of "throttling and pressure reduction - turbulent diffusion - energy dissipation". Through the energy attenuation layer by layer, the vibration energy is efficiently consumed, the energy utilization efficiency of the damping medium is improved, and the damping and vibration reduction performance of the anti-vibration hammer is enhanced.

[0037] Example 2 Please see Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that the damping medium filled in the cavity 21 of the hammer head 2 is vibrating particles 23, and the energy dissipation mechanism of the damping fluid is replaced by the energy dissipation mechanism of solid collision friction, thus forming a particle damping type vibration reduction hammer head 2.

[0038] The vibrating particles 23 are made of metal or ceramic materials; the metal materials are stainless steel, carbon steel or tungsten-based alloys, and the ceramic materials are alumina ceramics or silicon carbide ceramics.

[0039] The vibrating particles 23 are spherical particles with a particle size range of 1mm-5mm. The spherical structure allows the particles to have good rolling freedom in the cavity 21, reducing the jamming and agglomeration of irregular particles, and making the collision and friction behavior between particles uniform and continuous during vibration.

[0040] The volume filling rate of the vibrating particles 23 is 40%-60%, and the volume filling rate is the ratio of the natural accumulation volume of the vibrating particles 23 at room temperature to the effective net volume of the cavity 21.

[0041] When the hammer head 2 swings with the vibration of the line, the vibrating particles 23 in the cavity reciprocate with the cavity. Through the mutual collision, friction, and shearing between the particles, as well as the impact friction between the particles and the inner wall of the cavity, the mechanical energy of the line vibration is continuously converted into heat energy and deformation energy for dissipation, thereby achieving efficient vibration reduction of the anti-vibration hammer.

[0042] The specific energy dissipation principle is as follows: vibration energy is dissipated through solid collision and friction; when the line is vibrated by wind, the hammer head 2 swings back and forth, and the spherical vibrating particles 23 in the cavity move back and forth relative to the cavity; during the movement, continuous collision, friction and shearing occur between the particles, and at the same time, the particles and the inner wall of the cavity and the surface of the throttling plate generate impact friction, which continuously converts the vibration mechanical energy transmitted by the conductor into heat energy and particle deformation energy and dissipates it; thereby stabilizing and suppressing the vibration amplitude of the conductor and achieving the shockproof effect.

[0043] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A vibration damper for power transmission lines, comprising symmetrically arranged hammer heads (2), with two sets of hammer heads (2) connected by steel strands (5); a lower clamp (4) is fixedly mounted on the steel strands (5), and an upper clamp (3) is provided on the upper part of the lower clamp (4); characterized in that: The hammer (2) has a cavity (21) inside. The cavity (21) is press-fitted with a first throttling plate (24), a second throttling plate (25) and a third throttling plate (26) along the axial direction of the hammer (2). The first throttling plate (24) is close to the steel strand (5), the third throttling plate (26) is located on the outer end of the hammer (2), and the second throttling plate (25) is located between the first throttling plate (24) and the third throttling plate (26). The first throttling plate (24) and the third throttling plate (26) are provided with coaxially distributed first throttling holes (241), and the second throttling plate (25) is provided with a second throttling hole (242) that is offset from the first throttling hole (241); the cavity (21) is filled with damping medium; when the vibration hammer vibrates, the damping medium flows back and forth in the cavity (21) of the hammer head (2) to dissipate the energy of wind vibration.

2. The vibration damper for power transmission lines according to claim 1, characterized in that: The lower part of the lower clamp (4) is a cylindrical sleeve structure, and the upper part is a straight plate structure. The upper part of the lower clamp (4) is provided with symmetrically distributed second through holes (42).

3. The vibration damper for power transmission lines according to claim 2, characterized in that: The lower clamp (4) is provided with an upper clamp (3) at its upper part. The lower part of the upper clamp (3) is straight and the upper part is hook-shaped. A limiting groove (31) is provided in the middle of the straight lower part of the upper clamp (3).

4. A vibration damper for power transmission lines according to claim 3, characterized in that: The lower part of the upper wire clamp (3) is provided with a first through hole (32). The first through hole (32) and the second through hole (42) are coaxially arranged. The first through hole (32) and the second through hole (42) are fixed by bolts (41) and nuts (43).

5. A vibration damper for power transmission lines according to claim 1, characterized in that: The upper hook-shaped upper surface of the upper clamp (3) is integrally formed with a rivet point (33). The rivet point (33) is set along the length direction of the upper clamp (3). The rivet point (33) protrudes upward and there are two sets of rivet points (33). The two sets of rivet points (33) are distributed parallel to each other and staggered. The rivet points (33) are distributed at both ends of the upper clamp (3).

6. A vibration damper for power transmission lines according to claim 5, characterized in that: The steel wire (34) is used to install the anti-vibration hammer body on the overhead conductor (1). The steel wire (34) alternates between two sets of misaligned rivet points (33) and is wound in an S-shape around the side wall of the rivet point (33).

7. A vibration damper for power transmission lines according to claim 1, characterized in that: The first throttling plate (24), the second throttling plate (25) and the third throttling plate (26) are all circular in shape, and the first throttling hole (241) and the second throttling hole (242) are all circular, waist-shaped or oblong; the waist-shaped or oblong are arranged along the swing direction of the shock absorber.

8. A vibration damper for power transmission lines according to claim 1, characterized in that: The damping medium is a damping fluid or vibrating particles (23).

9. A vibration damper for power transmission lines according to claim 8, characterized in that: When the damping medium is a damping fluid, the damping fluid volume filling rate is 85%-95%.

10. A vibration damper for power transmission lines according to claim 8, characterized in that: When the damping medium is vibrating particles (23), the particle size of the vibrating particles (23) is 1mm-5mm, and the volume filling rate of the vibrating particles (23) is 40%-60%.

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