Anti-icing wire spacer for high-voltage line
By improving the design of the rotary clamp, and using staggered spiral ribs and rubber damping pads, the problems of rotation jamming and unstable friction damping of the rotary clamp were solved, achieving self-cleaning and stable anti-galling effect of the high-voltage line anti-icing conductor spacer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN XIAOHAN POWER SUPPLY CO LTD
- Filing Date
- 2026-01-06
- Publication Date
- 2026-04-21
AI Technical Summary
Existing rotary clamps suffer from problems such as rotational jamming, contaminant accumulation, and unstable frictional damping, leading to a decrease in anti-galling performance.
It adopts an outer clamp and an inner clamp design. The outer clamp consists of openable and connectable half-body parts, and the inner clamp consists of dockable half-body parts. The spiral rib design is staggered in the circumferential direction, combined with rubber damping pads to provide stable friction damping, so as to achieve self-cleaning and stable rotation.
It effectively prevents rotational jamming, ensures stable frictional damping, improves the long-term reliability of anti-galling function, adapts to different split conductor structures, and achieves independence of self-cleaning and damping.
Smart Images
Figure CN121906329A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-voltage transmission line fittings technology, specifically to an anti-icing conductor spacer for split conductors. Background Technology
[0002] High-voltage and ultra-high-voltage transmission lines often use split conductors to reduce corona loss and increase transmission capacity. To prevent whipping between sub-conductors, suppress icing growth, and mitigate galloping, conductor spacers need to be installed within the span. Anti-icing and anti-galloping spacers typically employ a combination of rotary and fixed clamps. Their working principle is as follows: by allowing some sub-conductors to undergo controlled torsion (rotation) relative to the spacer body under wind or unbalanced tension, torque transmission between sub-conductors is decoupled, disrupting the conditions for synchronous torsional oscillation (galloping), and also helping to break the integrity of the ice layer under specific conditions.
[0003] Existing rotary clamps mostly employ a rotary clamp structure, where an inner clamp for holding the conductor rotates within an outer clamp connected to a mounting bracket via a pivot. However, this conventional structure has significant drawbacks: the inner and outer clamps are typically composed of two halves joined together, with the joint of the pivot portion being a straight line parallel to the axis. This structure presents the following problems: First, unevenness can easily occur at the straight joint due to casting and assembly, causing the inner clamp to jam during rotation; second, dust, sludge, and other contaminants easily accumulate in the pivot gap and are difficult to remove, exacerbating jamming and even leading to functional failure; third, the rotational damping between the inner and outer clamps depends entirely on the machining condition of the metal contact surfaces, changing with wear or contamination, resulting in unstable performance. Once the rotational function jams or the damping malfunctions, the anti-galling effectiveness of the spacer will be significantly reduced. Summary of the Invention
[0004] The present invention aims to provide a high-voltage line anti-icing conductor spacer to improve the rotation jamming problem of rotary clamps and make its friction damping more stable, thereby ensuring the long-term reliability of its anti-galling function.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-voltage line anti-icing conductor spacer includes a mounting frame, at least one fixed clamp and at least one rotary clamp, wherein the fixed clamp and the rotary clamp are mounted on the mounting frame.
[0006] The rotary clamp includes: An outer clamp includes two openable and connectable outer clamp halves, which together form a fixed bushing for accommodating an inner clamp. The outer clamp has a drain port that communicates with the fixed bushing. The inner clamp includes two mating inner clamp halves, which together form a clamp hole for clamping a wire and a cylindrical fixing shaft located outside the clamp hole. The fixing shaft is rotatably fitted inside the fixing shaft sleeve. Retaining rings are provided on both ends of the fixing shaft of the inner clamp, and the retaining rings cooperate with the end face of the outer clamp to achieve axial limiting. The outer wall of the fixed shaft is provided with at least two spiral ribs. The spiral ribs are symmetrical about the central cross section of the fixed shaft along its length, and the spiral directions of the spiral ribs on both sides of the symmetrical plane are opposite. The mating surfaces of the two inner clamp halves are zigzag surfaces, so that after the two inner clamp halves are mated, a zigzag-shaped mating seam is formed on the outer surface of the fixed shaft; and for any one of the spiral ribs, the mating seams on the two inner clamp halves are staggered in the circumferential direction.
[0007] Optionally, each of the two inner clamp halves is provided with a rubber tile. After the two inner clamp halves are joined together, the rubber tiles surround and form the clamping surface of the clamp hole.
[0008] Optionally, the spiral rib has rounded corners at the end edges of the butt joint.
[0009] Optionally, a rubber damping pad is provided on the inner side of at least one of the retaining rings, the rubber damping pad being sandwiched between the end faces of the retaining ring and the outer clamp.
[0010] Optionally, the rubber damping pad is formed by joining two halves together, and its edge facing the outer clamp has a guide radius.
[0011] Optionally, the spacer is a two-split conductor spacer, which includes one fixed clamp and one rotary clamp.
[0012] Optionally, the spacer is a four-split conductor spacer, which includes two fixed clamps and two rotary clamps, with the two rotary clamps arranged diagonally.
[0013] Optionally, the fixed wire clamp and / or the rotary wire clamp are connected to the mounting frame via a damping hinge structure; the damping hinge structure includes a connecting shaft and at least one rubber pad sleeved on the connecting shaft, the wire clamp arm is hinged to the mounting frame via the connecting shaft, and the rubber pad is pressed between the wire clamp arm and the mounting frame; a limiting pair is also provided between the wire clamp arm and the mounting frame to limit the swing angle of the wire clamp arm.
[0014] Optionally, the fixed clamp and / or the rotary clamp are rigidly fixedly connected to the mounting bracket.
[0015] Compared with the prior art, the technical solution of the present invention can bring the following effects: 1. Reliable Axial Positioning and Stable Self-Cleaning: The retaining ring structure ensures reliable axial fixation of the inner clamp, preventing it from coming loose. Symmetrically arranged, oppositely rotating bidirectional helical ribs generate bidirectional scraping and pumping action when the conductor twists in either direction, pushing contaminants within the fixed bushing from the center to both ends or from both ends to the center, and discharging them through the drain port. Simultaneously, the symmetrical helical design balances the axial force generated during rotation, preventing axial movement of the inner clamp and helping to maintain stable alignment and frictional balance of the rotating pair.
[0016] 2. Effectively eliminates joint jamming: The butt joints formed by the zigzag butt surfaces are staggered in the circumferential direction. This means that the joints on the same spiral rib are not a continuous straight line, but are broken into multiple segments by the zigzag lines and staggered in the circumferential direction. This design greatly disrupts the continuous groove effect formed by straight joints, allowing the contact surface of the spiral rib to smoothly and continuously cross the butt joint area when the inner clamp rotates, fundamentally reducing the risk of mechanical jamming at the joint.
[0017] 3. Independent and stable friction damping: The primary axial friction damping is provided by an independent rubber damping pad, decoupling the core damping function from the radial friction pair of the shaft-sleeve, which performs transmission and self-cleaning functions. The damping characteristics of the rubber material are controllable and stable, unaffected by wear or contamination of the metal friction pair, thus ensuring the long-term stability of the damping in the rotating part of the spacer. This is crucial for effective anti-galling control.
[0018] 4. Flexible structural configuration: The inner clamp can be pre-twisted or fitted with rubber mats, among other clamping methods. The spacer can be adapted to different structures such as two-split and four-split, and the connection method between the clamp and the mounting bracket can also be selected according to project needs, offering good adaptability. Attached Figure Description
[0019] Figure 1 A three-dimensional structural schematic diagram of the two-split conductor spacer in Embodiment 1 of the present invention; Figure 2 Figure 2 for Figure 1 3D exploded view of the rotary clamp; Figure 3 Figure 2 A partial unfolded schematic diagram of the fixing shaft of the inner line clamp shows the staggered arrangement of the circumferential direction of the butt joint on the spiral rib; Figure 4 This is an exploded view of the connection between the damping hinge structure and the mounting bracket.
[0020] Figure 5 This is a schematic diagram of the structure of the four-split conductor spacer in Embodiment 2 of the present invention.
[0021] In the diagram, 1. Mounting bracket; 2. Fixed wire clamp; 3. Rotary wire clamp; 3-1. Inner wire clamp; 3-1-1. Inner wire clamp half; 3-1-2. Wire clamp hole; 3-1-3. Fixed shaft; 3-1-4. Retaining ring; 3-1-5. Spiral rib; 3-1-6. Butt joint; 3-1-7. Rubber mat; 3-2. Outer wire clamp; 3-2-1. Fixed shaft sleeve; 3-2-2. Drain port; 4. Rubber damping pad; 4-1. Half; 5. Rubber pad; 6. Wire clamp arm; 7. Connecting shaft; 8. Limiting pair. Detailed Implementation
[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example
[0023] like Figures 1 to 4 As shown, this embodiment provides a two-split conductor spacer, including a mounting bracket 1, a fixed clamp 2, and a rotary clamp 3.
[0024] The rotary clamp 3 includes an outer clamp 3-2 and an inner clamp 3-1. The outer clamp 3-2 consists of two outer clamp 3-2 halves connected by hinges and bolts. When closed, they form a cylindrical fixed bushing 3-2-1 with a drain port 3-2-2 on its lower side.
[0025] The inner clamp 3-1 consists of two inner clamp halves 3-1-1 connected by bolts. After the two halves are connected, a clamp hole 3-1-2 for clamping the wire is formed inside, and a cylindrical fixing shaft 3-1-3 is formed outside. The end of the fixing shaft 3-1-3 is provided with a radially protruding retaining ring 3-1-4 for axial limiting.
[0026] The outer wall of the fixed shaft 3-1-3 is cast with two spiral ribs 3-1-5 with opposite directions of rotation and symmetrical about its central cross section. The symmetrical double spiral design balances the axial force during rotation.
[0027] The mating surfaces of the two inner clamp halves 3-1-1 are machined into polygonal surfaces. After mating, a polygonal butt joint 3-1-6 is formed on the surface of the fixed shaft 3-1-3. Crucially, for any one of the spiral ribs 3-1-5, this butt joint 3-1-6 "cuts" it into multiple segments, and these breaks are staggered in the circumferential direction (i.e., around the axis of the fixed shaft 3-1-3), not aligned, as shown below. Figure 3 As shown. This "circumferentially intersecting" structure means that the spiral ribs 3-1-5, which serve as the main friction surface, are no longer complete straight lines on the circumference, thus effectively preventing them from aligning with a continuous straight groove and getting stuck during rotation.
[0028] On the other hand, another function of the spiral rib 3-1-5 is to hide the butt joint 3-1-6 located in the groove of the spiral rib 3-1-5. When the fixed shaft 3-1-3 and the fixed bushing 3-2-1 rotate relative to each other, the hidden butt joint 3-1-6 will not participate in the rotational friction. Only the spiral rib 3-1-5 rubs against the inner wall of the fixed bushing 3-2-1, which will reduce the probability of jamming.
[0029] An annular rubber damping pad 4 is installed on the inner side of one of the retaining rings 3-1-4. The rubber damping pad 4 consists of two halves 4-1, with guide radii machined on their outer edges. After assembly, the rubber damping pad 4 is pressed between the end faces of the retaining ring 3-1-4 and the outer clamp 3-2, providing stable rotational damping.
[0030] The core of this rotational damping mechanism is the rubber damping pad 4, which provides a preset and stable frictional resistance torque for the rotation of the inner clamp 3-1. This resistance torque needs to be precisely designed: its magnitude must be sufficient to prevent the conductor from engaging in unproductive free rotation or continuous swaying under light winds or normal conditions, thereby maintaining the relative stability of the conductor system; at the same time, it must be less than the driving torque generated by the conductor under wind excitation or unbalanced de-icing tension, ensuring that the inner clamp 3-1 can overcome this damping and rotate smoothly when decoupling torque is required to suppress galloping. Damping is provided by the elastic deformation of the rubber pad 5, and its characteristics are stable and controllable, avoiding the defects of traditional metal friction pair damping that are easily contaminated and worn, thus ensuring the long-term effectiveness and reliability of the spacer's anti-galloping function.
[0031] The connection method between the outer clamp 3-2 of the rotary clamp 3 and the mounting bracket 1 can be selected according to project needs: one is to use, for example... Figure 5 The damping hinge structure shown is used for connection; another method is to directly and rigidly fix it to the mounting bracket 1 with bolts.
[0032] Each of the two inner wire clamp halves 3-1-1 is provided with a rubber tile 3-1-7. After the two inner wire clamp halves 3-1-1 are joined together, the rubber tile 3-1-7 surrounds and forms the clamping surface of the wire clamp hole.
[0033] Alternatively, rubber tiles 3-1-7 can be omitted, and pre-twisted wires can be used to fix the split conductors, which is also a commonly used technique in this field. Example
[0034] like Figure 5 As shown, this embodiment is a four-split conductor spacer, with its mounting bracket 1 in an "X" shape. Two rotary clamps 3 are arranged diagonally, and fixed clamps 2 are arranged at the other two corners. The specific structure of each clamp is the same as described in Embodiment 1.
[0035] Working principle: During installation, the wire is clamped in the clamping hole 3-1-2 of the inner clamp 3-1 (optionally clamped by the rubber pad 5). When the wire twists due to wind or icing, it causes the inner clamp 3-1 to rotate back and forth within the outer clamp 3-2.
[0036] At this time, the bidirectional spiral ribs 3-1-5 on the fixed shaft 3-1-3 continuously scrape and pump out contaminants, achieving self-cleaning through the discharge port 3-2-2. Simultaneously, its symmetrical structure ensures the balance of axial forces. The retaining ring 3-1-4 and the balanced axial forces together ensure the stability of the rotating pair.
[0037] Because the butt joint 3-1-6 is staggered in a circumferential direction on the spiral rib 3-1-5, the contact surface of the spiral rib 3-1-5 of the inner clamp 3-1 changes continuously when it rotates, effectively avoiding the jamming trap of traditional straight joints.
[0038] The damping required for the rotational motion is mainly provided by the compressed rubber damping pad 4, and the damping value is stable. This reliable and damped rotational capability effectively decouples the torque transmission between the sub-conductors and suppresses synchronous galloping. If a damped hinge structure is adopted, the clamp can also swing within a certain angle through the clamp arm 6, connecting shaft 7, and limiting pair 8 to adapt to the dynamic movement of the conductor. It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.
[0039] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.
Claims
1. A high-voltage line anti-icing conductor spacer, comprising a mounting frame, at least one fixed clamp and at least one rotary clamp, wherein the fixed clamp and the rotary clamp are mounted on the mounting frame, characterized in that: The rotary clamp includes: An outer clamp includes two openable and connectable outer clamp halves, which together form a fixed bushing for accommodating an inner clamp. The outer clamp has a drain port that communicates with the fixed bushing. The inner clamp includes two mating inner clamp halves, which together form a clamp hole for clamping a wire and a cylindrical fixing shaft located outside the clamp hole. The fixing shaft is rotatably fitted inside the fixing shaft sleeve. Retaining rings are provided on both ends of the fixing shaft of the inner clamp, and the retaining rings cooperate with the end face of the outer clamp to achieve axial limiting. The outer wall of the fixed shaft is provided with at least two spiral ribs. The spiral ribs are symmetrical about the central cross section of the fixed shaft along its length, and the spiral directions of the spiral ribs on both sides of the symmetrical plane are opposite. The mating surfaces of the two inner clamp halves are zigzag surfaces, so that after the two inner clamp halves are mated, a zigzag-shaped mating seam is formed on the outer surface of the fixed shaft; and for any one of the spiral ribs, the mating seams on the two inner clamp halves are staggered in the circumferential direction.
2. The high-voltage line anti-icing conductor spacer according to claim 1, characterized in that: Both inner clamp halves are provided with rubber tiles. After the two inner clamp halves are joined together, the rubber tiles surround and form the clamping surface of the clamp hole.
3. The high-voltage line anti-icing conductor spacer according to claim 1, characterized in that: The spiral rib has rounded corners at the end edges of the butt joint.
4. The high-voltage line anti-icing conductor spacer according to any one of claims 1 to 3, characterized in that: A rubber damping pad is provided on the inner side of at least one of the retaining rings, and the rubber damping pad is sandwiched between the end face of the retaining ring and the outer clamp.
5. The high-voltage line anti-icing conductor spacer according to claim 4, characterized in that: The rubber damping pad is formed by joining two halves together, and its edge facing the outer clamp has a guide rounded corner.
6. The high-voltage line anti-icing conductor spacer according to claim 1, characterized in that: The spacer is a two-split conductor spacer, which includes a fixed clamp and a rotary clamp.
7. The high-voltage line anti-icing conductor spacer according to claim 1, characterized in that: The spacer is a four-split conductor spacer, which includes two fixed clamps and two rotary clamps, with the two rotary clamps arranged diagonally.
8. The high-voltage line anti-icing conductor spacer according to claim 1, 6 or 7, characterized in that: The fixed wire clamp and / or the rotary wire clamp are connected to the mounting bracket via a damping hinge structure; The damping hinge structure includes a connecting shaft and at least one rubber pad sleeved on the connecting shaft. The clamp arm of the wire clamp is hinged to the mounting frame through the connecting shaft. The rubber pad is pressed between the clamp arm and the mounting frame. A limiting pair is also provided between the clamp arm and the mounting frame to limit the swing angle of the clamp arm.
9. The high-voltage line anti-icing conductor spacer according to claim 1, 6 or 7, characterized in that: The fixed clamp and / or the rotary clamp are rigidly fixedly connected to the mounting bracket.