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CN-122000713-A - Cable joint connector and crimping die

CN122000713ACN 122000713 ACN122000713 ACN 122000713ACN-122000713-A

Abstract

The invention discloses a cable joint connector which comprises a conductive pipe body, wherein the cross section of the inner wall of the pipe body is circular, and convex parts and concave parts which are alternately arranged at intervals are arranged on the periphery of the outer wall of the pipe body. The material of the convex part of the pipe body is extruded and flowed to the adjacent concave part by the first partial pressure F 11 ,F 12 which is parallel to the tangent line of the most convex point and opposite in direction through the upper and lower involution applied pressure F of the external die, the outer wall of the pipe body forms a similar circular shape, the generation of edge angles and point discharge is avoided, and the secondary polishing of the edge angles and the point is not needed. Meanwhile, in the extrusion flowing process of the materials of the convex parts, the second partial pressure F 2 pointing to the center of the inner wall is generated by acting on the pressure F of the convex parts, and after the second partial pressure F 2 of each convex part is in compression joint, the inner wall of the pipe body is extruded to be close to a wire in the inner wall, and the shape of the inner wall of the pipe body is similar to a circle after compression joint due to uniform stress, so that the contact area is increased, and the working resistance of the connector after compression joint is reduced.

Inventors

  • LI KONGXING
  • LIANG QIYE
  • CHEN BINGXIANG
  • DU XIAOJIAN
  • LI JUNPING
  • ZENG JIACHENG
  • XU WEILIN
  • ZHANG LUWEN
  • ZHU HAIHUI
  • Yuan Chenzhan

Assignees

  • 广州勇艺邦电子科技有限公司

Dates

Publication Date
20260508
Application Date
20260206

Claims (15)

  1. 1. The cable joint connector is characterized by comprising a conductive pipe body, wherein the section of the inner wall of the pipe body is circular, and the periphery of the outer wall of the pipe body is provided with convex parts and concave parts which are alternately arranged at intervals.
  2. 2. The cable fitting connector of claim 1, wherein the projections are symmetrically disposed in pairs about the center of the inner wall.
  3. 3. The cable joint connector of claim 1, wherein the outer profile of the protrusions is circular arc-shaped, the protrusions are symmetrically arranged in pairs about the center of the inner wall, the pairs of protrusions are 2n+1 pairs, n is a non-zero natural number, and wherein a pair of protrusions are located directly above and directly below.
  4. 4. A cable splice connector as claimed in claim 3, wherein the pairs of projections are three pairs.
  5. 5. A cable splice connector as claimed in claim 3, wherein the projections immediately above and immediately below each follow the respective projections in a horizontal direction through the center of the inner wall, with the arc angle increasing.
  6. 6. A cable splice connector as claimed in claim 3, wherein the recess in a horizontal line passing through the centre of the inner wall is tapered to the outer profile of each recess in the direction directly above and directly below, respectively.
  7. 7. The cable splice connector of claim 1 wherein the outer profile of the projections is arcuate at an angle of 0-90 degrees and the outer profile of the other projections is arcuate at an angle of 0-90 degrees when positioned directly above and directly below.
  8. 8. The cable splice connector of claim 7, wherein the arcuate angle of the outer profile of the male portion immediately above and immediately below is 47.72 degrees and the arcuate angle of the outer profile of the other male portion is 66.14 degrees.
  9. 9. The cable fitting connector of claim 1 wherein the arc angle of the outer contour of the recess is 0-90 degrees and the arc angle of the outer contour of the other recess is 0-90 degrees at a horizontal line passing through the center of the inner wall.
  10. 10. The cable splice connector of claim 9, wherein the arcuate angle of the outer contours of the recesses located on a horizontal line passing through the center of the inner wall is 18 degrees and the arcuate angles of the outer contours of the projections of the other pairs are 0 degrees.
  11. 11. The cable splice connector of claim 1 wherein the number of projections is 2n+1, n being a non-zero natural number, the projections being subjected to crimping pressure directed toward the center of the inner wall by the crimping module.
  12. 12. A crimping die, comprising an upper die and a lower die, wherein the crimping surfaces of the upper die and the lower die are respectively arc surfaces, and are butted to form a circle to accommodate the cable joint connector body according to any one of claims 1-11 for crimping.
  13. 13. The crimping die set, characterized by comprising a plurality of crimping die sets, the crimping pressure of crimping die sets is directional in the body inner wall centre of a circle of cable joint connector according to claim 11, and the crimping face of crimping die sets is the arc face respectively, and all crimping die sets are involuted and are formed a circular in order to hold the body of pipe crimping.
  14. 14. The crimping die of claim 13, wherein the number of crimping modules is the same as the number of projections of the cable connector, one-to-one.
  15. 15. The crimping die of claim 13, wherein the number of crimping modules is less than the number of projections of the cable connector, and wherein a crimping face of a crimping module contacts a highest point of the projections.

Description

Cable joint connector and crimping die Technical Field The invention relates to the technical field of medium-high voltage power transmission, in particular to a cable joint connector and a crimping module. Background In a 10kV power distribution system, the cable is used as a core transmission element, and the reliability of the conductor connection part directly determines the operation stability and the service life of the whole power system. At present, the main current 10kV cable conductor connection mode in the industry is mainly divided into two types of fusion connection and compression connection, however, the two traditional connection modes have inherent technical defects which are difficult to overcome, and additional insulating hidden dangers are easy to cause after compression connection molding, so that the connection part becomes a weak link of an electric power system, and targeted improvement is needed. In the prior art, the fusion connection (such as argon arc welding and capacitive energy storage welding) is realized by instantaneously releasing high heat to melt the contact part of the cable conductor and the wiring terminal, and the metallurgical bonding is formed after cooling so as to realize electric conduction. The design of this approach was initially to eliminate the contact gap by the metal melting-solidification process, and lower contact resistance could theoretically be achieved. In practical application, however, the core defect of fusion joint is that the insulating layer of a 10kV cable is mostly made of XLPE crosslinked polyethylene material due to instantaneous high temperature, the long-term allowable working temperature is only 90 ℃, the instantaneous temperature of fusion joint can reach thousands of degrees, even though the fusion joint is shielded by a tool, the high temperature can still be conducted to the insulating layer, so that the molecular chain of the insulating material is broken, the crosslinking degree is reduced, obvious thermal aging phenomena, such as hardening, embrittlement and reduction of the electric resistance of the insulating layer, and meanwhile, the high temperature can also cause rapid coarsening of metal grains at the butt joint part of a conductor, the original excellent conductivity and mechanical property of the metal are damaged, the brittleness of the conductor is increased, cracks are easy to occur in long-term operation, the hidden danger of subsequent electric breakdown burying is finally and obviously shortening the whole service life of the cable. The binding post sleeved on the cable conductor is extruded in a segmented way through hydraulic or mechanical crimping pliers, so that the terminal and the conductor are subjected to plastic deformation, and electric conduction is realized through mechanical engagement and microcosmic lamination of a metal contact surface. The method avoids the high temperature problem of fusion connection, but has the technical shortboard which is difficult to solve, on one hand, because the compression joint adopts a sectional compression mode and combines the surface roughness difference of the terminal and the conductor, the contact interface of the conductor and the terminal can not form ideal surface contact, but presents a state of a plurality of local contact points or contact sections, so that the effective contact area is uneven, the total contact resistance at the joint is obviously increased due to the reduction of the local effective contact area, the current is constant when a 10kV cable normally operates, a large amount of Joule heat is generated at the joint after the contact resistance is increased, the local temperature is far beyond the normal working temperature of the cable, and the aging of a peripheral insulating layer is accelerated, on the other hand, the pressure joint forming process is inevitably accompanied by the generation of a tip/edge angle, and particularly comprises metal burrs and flash formed by uneven material flow at the edge of the terminal, steps or bulges formed between adjacent compression joint sections due to insufficient mould precision and the like. Under the condition of 10kV medium-high voltage environment, the sharp points/edges can cause serious hidden danger of point discharge (corona discharge), and the tiny sharp points at the press joint are enough to enable the local electric field intensity to exceed the air breakdown field intensity, so that air ionization is caused, corona discharge is generated, and ozone, nitrogen oxide generation and electric energy loss are accompanied. The strong oxidizing substances generated by the discharge can continuously corrode the insulating layer and the sheath around the crimping part to further damage the insulation integrity, heat released in the discharge process is superposed with the heating of the contact resistor to form a double aging mechanism of 'discharge heating + resistance heating', so that the dama