110kv strain clamp

Abstract

This utility model relates to the field of power fittings technology and discloses a 110kV tension clamp. The clamp body is U-shaped and includes an arc-shaped connecting part. Each end of the arc-shaped connecting part is integrally connected to a straight arm. The ends of the two straight arms are provided with bolt fixing holes for connection. The two ends of the arc-shaped connecting part are provided with mounting holes at the same position, and the axes of the two mounting holes are collinear. A slotted threaded sleeve is fixed on the outer side of the clamp body at the end of the mounting hole. The slotted threaded sleeve has at least one slit along its axial direction. Each slotted threaded sleeve is screwed with a locking nut. The slotted threaded sleeve is coaxial with the mounting hole. The same crimping sleeve is welded into the two mounting holes. The inner wall of the crimping sleeve is provided with internal threads.

Description

Technical Field

[0001] This utility model relates to the field of power fittings technology, and in particular to an auxiliary device for high-voltage transmission lines, specifically a 110kV tension clamp. Background Technology

[0002] Tension clamps are crucial hardware components used in power transmission lines to secure conductors and withstand conductor tension; their performance directly impacts the safe operation of the transmission lines. Currently, traditional tension clamps used in 110kV power transmission lines are mostly manufactured using casting or forging processes. Their materials are typically plain carbon steel, malleable cast iron, or a single grade of aluminum / copper alloy, which has the following drawbacks: 1. Traditional tension clamps, in order to meet strength requirements, require a large volume, resulting in a bulky and heavy overall design. They often use high-density materials, leading to excessive weight per unit. This not only increases transportation costs but also poses significant safety risks during installation. Replacing them with other materials may result in lower conductivity and connection reliability compared to existing copper alloys, failing to meet requirements; furthermore, it may increase material costs.

[0003] 2. Casting or forging itself can easily produce microscopic defects such as porosity and inclusions inside the product, which not only become a shortcoming in mechanical properties, but also increase local resistance and reduce conductivity when current flows through the product.

[0004] 3. Traditional tension clamps are prone to corrosion in harsh environments, which affects their service life.

[0005] 4. Traditional tension clamps generate abnormal heat at the joint; and if conventional fusion welding is used, brittle intermetallic compounds are easily formed between aluminum and copper, two dissimilar metals, resulting in low weld strength and poor conductivity, which becomes a potential fault point for line operation.

[0006] 5. Traditional tension clamps have a simple conductor structure with a smooth inner wall. The connection with the conductor relies solely on the static friction generated by plastic deformation, resulting in limited gripping force. Moreover, the crimping process depends entirely on the experience of the installer. Misalignment or incomplete insertion by the installer can easily lead to incomplete crimping and uneven gripping force, thereby increasing local contact resistance and causing severe overheating. Under long-term tension, this can lead to conductor slippage or even breakage, seriously affecting the long-term service life and safety of the line.

[0007] Therefore, there is a need for a tension clamp that is lightweight, has good electrical conductivity, strong corrosion resistance, reasonable structure, and can ensure consistent construction quality. Utility Model Content

[0008] To address the problems of existing tension clamps, such as bulky structure, inherent material defects, unreasonable crimping interface design, high weight, poor conductivity, easy corrosion, excessive reliance on experience during construction, and high long-term operational risks, this utility model provides a 110kV tension clamp.

[0009] This utility model provides a 110kV tension clamp, including a clamp body, which is U-shaped and includes an arc-shaped connecting part. Straight arms are integrally connected to both ends of the arc-shaped connecting part. Bolt fixing holes for connection are opened at the ends of both straight arms. Mounting holes are opened at the same positions at both ends of the arc-shaped connecting part, and the axes of the two mounting holes are collinear. A slotted threaded sleeve is fixed to the outer side of the clamp body at the end of the mounting hole. The slotted threaded sleeve has at least one slit along its axial direction, and a locking nut is screwed onto each slotted threaded sleeve. The slotted threaded sleeve is coaxial with the mounting hole. The same crimping sleeve is welded into the two mounting holes, and the inner wall of the crimping sleeve has internal threads.

[0010] During implementation, the clamp body serves as the basic load-bearing and connecting component of the tension clamp. The clamp body is U-shaped and includes an arc-shaped connecting part. The arc-shaped connecting part utilizes the bottom arc to disperse stress, reducing the risk of cracking caused by stress concentration and providing a stable mechanical support form. It can adapt to the direction of conductor tension and transfer the conductor tension to the insulator string or tower. Each end of the arc-shaped connecting part is integrally connected to a straight arm. Both straight arms have bolt fixing holes at their ends for connection, establishing a mechanical connection with the insulator string or tower. By fixing with assembly bolts, the connection stability of the overall line structure is ensured. The diameter of the bolt fixing holes is 20mm, and the two bolt fixing holes are in the same position for connecting the insulator string or tower. The bolt fixing operation is convenient, ensuring the structural reliability of the tension section of the transmission line and reducing the probability of line faults caused by clamp body failure.

[0011] The two ends of the arc-shaped connector have mounting holes at the same position, and the axes of the two mounting holes are collinear.

[0012] A slotted threaded sleeve is fixed to the outer side of the wire clamp body at the end of the mounting hole. The slotted threaded sleeve has at least one slot along its axial direction. When the lock nut is tightened, the threaded sleeve contracts and hugs the wire. Each slotted threaded sleeve is screwed with its own lock nut. The slotted threaded sleeve is coaxial with the mounting hole.

[0013] The same crimp sleeve is welded into both mounting holes. The inner diameter of the crimp sleeve matches the outer diameter of the wire, providing space for the wire. In this embodiment, the wire is 150-240mm in diameter. 2The inner wall of the crimp sleeve is provided with internal threads. The depth of the internal threads of the crimp sleeve is 0.5mm and the pitch is 5mm. This is used to enhance the friction after the conductor is crimped, effectively prevent the conductor from slipping out of the sleeve when under tension, and ensure the stability of the line tension. The outer surface of the weld area between the mounting hole of the clamp body and the crimp sleeve is provided with an anti-corrosion layer.

[0014] In use, insert the end of the wire through the slotted threaded sleeve at one end, and then along the inner wall of the crimping sleeve. After passing through the crimping sleeve, it exits through the slotted threaded sleeve at the other end. Tighten the locking nut on the slotted threaded sleeve. Under the tightening action of the locking nut, the slotted threaded sleeve elastically contracts, initially gripping the wire and achieving temporary fixation and positioning. Use a crimping device to crimp the crimping sleeve. The crimping sleeve undergoes plastic deformation, and the internal thread of its inner wall tightly engages with the surface of the wire, forming a mechanical interlock. After crimping, the wire and the inner wall of the sleeve are tightly fitted, with a gap of <0.1mm. The gripping force between the wire and the sleeve is increased, preventing wire slippage. Due to the increased contact area and mechanical interlocking effect of the texture, the gripping force can theoretically be increased by 20%~30% compared to a smooth inner wall. A mechanical transmission path is established between the wire, sleeve, and body, transferring the wire tension to the body through the sleeve.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The 110kV tension clamp provided by this utility model improves the shape and structure of the clamp body and adopts a U-shaped structure to effectively disperse the concentrated tension transmitted by the conductor, greatly reducing the risk of stress concentration, improving mechanical reliability, and thus significantly extending the service life of the product, effectively overcoming the inherent defects of traditional products.

[0016] The inner wall of the crimping sleeve is machined with internal threads, which can significantly increase the contact area and mechanical interlocking force with the conductor during the crimping process, effectively improve the anti-slip capability, ensure the uniform transmission of mechanical tension, avoid local stress concentration, and ensure the stability of line tension. After crimping, the conductor is tightly attached to the inner wall of the crimping sleeve, which achieves a lower contact resistance to reduce power loss. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of this utility model.

[0018] In the diagram: 1-Clip clamp body, 2-Crimping sleeve, 3-Bolt fixing hole, 4-Slotted threaded sleeve, 5-Locking nut, 6-Wire. Detailed Implementation

[0019] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0020] A type of 110kV tension clamp, such as Figure 1As shown, the clamp body 1 serves as the basic load-bearing and connecting component of the tension clamp. The clamp body 1 is U-shaped and includes an arc-shaped connecting part. The arc-shaped connecting part utilizes the bottom arc to disperse stress, reducing the risk of cracking caused by stress concentration and providing a stable mechanical support form. It can adapt to the tension direction of the conductor 6 and transfer the tension of the conductor 6 to the insulator string or tower. Each end of the arc-shaped connecting part is integrally connected to a straight arm. The ends of the two straight arms are each provided with bolt fixing holes 3 for connection, establishing a mechanical connection with the insulator string or tower. By fixing with assembly bolts, the connection stability of the overall line structure is ensured. The diameter of the bolt fixing holes 3 is 20mm, and the two bolt fixing holes 3 are in the same position for connecting the insulator string or tower. The bolt fixing operation is convenient, ensuring the structural reliability of the tension section of the transmission line and reducing the probability of line faults caused by the failure of the clamp body 1. The two ends of the arc-shaped connector have mounting holes at the same position, and the axes of the two mounting holes are collinear; A slotted screw sleeve 4 is fixed on the outer side of the wire clamp body 1 at the end of the mounting hole. The slotted screw sleeve 4 has at least one slot along its axial direction. When the locking nut 5 is tightened, the screw sleeve retracts and hugs the wire 6. Each locking nut 5 is screwed on the slotted screw sleeve 4. The slotted screw sleeve 4 is coaxial with the mounting hole. The same crimp sleeve 2 is welded into both mounting holes. The inner diameter of the crimp sleeve 2 matches the outer diameter of the wire 6, providing space for the wire 6. In this embodiment, the wire 6 is 150-240mm in diameter. 2 The inner wall of the crimp sleeve 2 is provided with internal threads. The depth of the internal threads of the crimp sleeve 2 is 0.5mm and the pitch is 5mm. This is used to enhance the friction of the conductor 6 after crimping, effectively preventing the conductor 6 from slipping out of the sleeve when under tension, and ensuring the stability of the line tension. The outer surface of the weld area between the mounting hole of the clamp body 1 and the crimp sleeve 2 is provided with an anti-corrosion layer. In use, the end of the wire 6 is inserted through the slotted threaded sleeve 4 at one end and along the inner wall of the crimping sleeve 2, then exits through the slotted threaded sleeve 4 at the other end; the locking nut 5 on the slotted threaded sleeve 4 is tightened, and the slotted threaded sleeve 4 elastically contracts under the tightening action of the locking nut 5, initially gripping the wire 6, achieving temporary fixation and positioning of the wire 6, and ensuring the correct positioning of the wire 6 in the sleeve before crimping; the crimping sleeve 2 is crimped using crimping equipment, such as hydraulic or burst crimping, as selected by those skilled in the art according to actual needs; crimping sleeve 2. Plastic deformation: The internal thread of the inner wall of the sleeve tightly engages with the surface of the wire 6, forming a mechanical interlock. After crimping, the wire 6 is tightly attached to the inner wall of the sleeve, improving the crimping qualification rate to over 98%. After crimping, the gap between the wire 6 and the inner wall of the sleeve is <0.1mm. The gripping force between the wire 6 and the crimping sleeve is increased, preventing the wire 6 from slipping. Due to the increased contact area and mechanical interlocking effect of the texture, the gripping force can theoretically be increased by 20%~30% compared to a smooth inner wall. A mechanical transmission path is established from the wire 6 to the sleeve to the body, transmitting the tension of the wire 6 to the body through the sleeve.

[0021] With 185mm 2 Taking the crimping of conductor 6 as an example, it is compared with the traditional tension clamp.

[0022] Using 3D modeling and measurement, the contact area of ​​the smooth inner wall is S1, and the contact area of ​​the spiral pattern is S2. S2 = 1.4S1, that is, the spiral pattern increases the contact area between the wire 6 and the sleeve by about 40%.

[0023] A tensile test was conducted on the crimped conductor 6. The gripping force of the smooth sleeve was about 80kN, and the gripping force of the spiral sleeve reached 96~104kN, which is 20%-30% higher. This can resist the risk of slippage of conductor 6 under long-term wind swing and ice load, and ensure the sag stability of the line.

[0024] To reduce the contact resistance to an ideal range, such as from the mΩ level of poor contact to the uΩ level, based on an annual operation of the transmission line of 5000 hours and an electricity price of 0.5 yuan / kWh, the annual energy saving per set of clamps is: ΔW=I 2 RΔt=300 2 × (0.5×10 -3 -0.05×10 -6 ) × 5000 ≈ 225 kWh, which is equivalent to 112.5 yuan.

[0025] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A 110kV tension clamp, characterized in that: The clamp body (1) is U-shaped and includes an arc-shaped connecting part. Each of the two ends of the arc-shaped connecting part is integrally connected to a straight arm. The ends of the two straight arms are provided with bolt fixing holes (3) for connection. The two ends of the arc-shaped connecting part are provided with mounting holes at the same position. The axes of the two mounting holes are collinear. A slotted threaded sleeve (4) is fixed on the outer side of the clamp body (1) at the end of the mounting hole. The slotted threaded sleeve (4) has at least one slot along its axial direction. Each slotted threaded sleeve (4) is screwed with a locking nut (5). The slotted threaded sleeve (4) is coaxial with the mounting hole. The same crimp sleeve (2) is welded into the two mounting holes, and the inner wall of the crimp sleeve (2) is provided with internal threads.

2. A 110kV tension clamp according to claim 1, characterized in that: The internal thread depth of the crimped sleeve (2) is 0.5 mm, and the thread pitch is 5 mm.

3. A 110kV tension clamp according to claim 1, characterized in that: The diameter of the bolt fixing hole (3) is 20mm.

4. A 110kV tension clamp according to claim 1, characterized in that: The outer surface of the weld zone between the mounting hole of the clamp body (1) and the crimp sleeve (2) is provided with an anti-corrosion layer.

Images