CN-224217254-U - Conversion monofilament for copper-aluminum flexible transition submarine cable

CN224217254UCN 224217254 UCN224217254 UCN 224217254UCN-224217254-U

Abstract

The utility model belongs to the technical field of power transmission, and particularly relates to a conversion monofilament for a copper-aluminum flexible transition sea cable, which comprises four embedded blocks, wherein the four embedded blocks are aluminum alloy parts and have a melting point lower than that of pure copper and pure aluminum, two conductive sections are copper wire sections and aluminum wire sections, the butt joint ends of the conductive sections are provided with strip-shaped blocks, the end surfaces of the strip-shaped blocks are provided with rectangular grooves, the rectangular grooves penetrate through the surfaces of the two sides of the strip-shaped blocks along the width direction of the strip-shaped blocks, the butt joint ends of the two conductive sections are in cross-shaped splicing, and four embedded grooves are formed, and the embedded blocks are arranged in the embedded grooves in a one-to-one correspondence manner, so that the monofilament is of a cylindrical structure as a whole. The utility model forms a cross clamping design, increases the contact area of copper and aluminum, forms radial limit, improves the mechanical connection strength, disperses stress concentration, reduces the fracture risk of welding spots, improves the electrical performance, realizes metallurgical bonding, forms seamless connection, ensures firm connection, and ensures that the monofilament integrally maintains a cylindrical structure.

Inventors

QUAN YAMING
ZHANG JINFA
MENG QINGWEI
ZHANG HUIMENG
CHEN HUIXIONG
WANG YIYING
SHA XINYU
WANG YU

Assignees

长飞(江苏)海洋科技有限公司
广西广投北部湾海上风力发电有限公司

Dates

Publication Date: 20260508
Application Date: 20250418

Claims (7)

1. A transition monofilament for a copper aluminum flexible transition submarine cable, comprising: the four embedded blocks are aluminum alloy pieces, and the melting point of the four embedded blocks is lower than that of pure copper and pure aluminum; The two conductive segments are copper wire segments and aluminum wire segments, the butt joint ends of the conductive segments are provided with strip-shaped blocks, the end faces of the strip-shaped blocks are provided with rectangular grooves, and the rectangular grooves penetrate through to the surfaces of two sides of the strip-shaped blocks along the width direction of the strip-shaped blocks; The butt ends of the two conductive sections are in cross-shaped insertion connection, four embedded grooves are formed, and the embedded blocks are arranged in the embedded grooves in a one-to-one correspondence mode, so that the monofilament is of a cylindrical structure as a whole.
2. The transition monofilament for a copper aluminum flexible transition submarine cable according to claim 1, wherein the rectangular grooves have a groove width corresponding to the width of the bar-shaped blocks.
3. The transition monofilament for a copper aluminum flex transition sea cable according to claim 1, wherein said conductive segments, said bar blocks and said rectangular grooves are concentrically arranged.
4. The transition monofilament for a copper aluminum flexible transition submarine cable according to claim 1, wherein the groove depth of the rectangular groove is half the thickness of the bar.
5. The transition monofilament for a copper-aluminum flexible transition submarine cable according to claim 1, wherein both sides in the length direction of the strip-shaped block are arc surfaces, and the arc surfaces and the conductive segments are arranged in a co-circle.
6. The transition monofilament for a copper aluminum flexible transition submarine cable according to claim 1, wherein the width of said bar-shaped block corresponds to the radius of said monofilament.
7. The transition monofilament for a copper aluminum flexible transition submarine cable according to claim 1, wherein the insert block is an aluminum silicon alloy member and is provided in the insert groove by melting.

Description

Conversion monofilament for copper-aluminum flexible transition submarine cable Technical Field The utility model belongs to the technical field of power transmission, and particularly relates to a conversion monofilament for a copper-aluminum flexible transition submarine cable. Background Conventional submarine cable conductors are widely made of pure copper materials, and are mainly dependent on excellent conductivity and corrosion resistance. However, copper resources are limited in reserves in the crust, the exploitation cost is high, and the industry actively explores an aluminum-substituted copper scheme under the drive of environmental protection and cost reduction requirements. Although the aluminum conductor has the advantages of light weight, low cost, rich reserves and the like, the resistivity of the aluminum conductor is obviously higher than that of copper, and the direct replacement of the aluminum conductor can cause the increase of the transmission loss of the cable. Therefore, in order to balance the electrical performance and the cost, the prior art adopts a copper-aluminum transition structure that an equal-diameter aluminum wire and a copper wire are directly butted by a cold welding process so as to keep the consistency of the outer diameter of a conductor and the extrusion stability of an insulating layer. However, the structure has the problem of low connection strength of the welding spot area, is easy to cause broken wires in the production process, is inconvenient to produce and manufacture, and has poor usability. Disclosure of utility model The utility model aims to provide a transition monofilament for a copper-aluminum flexible transition submarine cable, which solves the technical problem of low connection strength of an aluminum wire and a copper wire welding spot area in the prior art. The utility model discloses a conversion monofilament for a copper-aluminum flexible transition submarine cable, which comprises the following components: the four embedded blocks are aluminum alloy pieces, and the melting point of the four embedded blocks is lower than that of pure copper and pure aluminum; The two conductive segments are copper wire segments and aluminum wire segments, the butt joint ends of the conductive segments are provided with strip-shaped blocks, the end faces of the strip-shaped blocks are provided with rectangular grooves, and the rectangular grooves penetrate through to the surfaces of two sides of the strip-shaped blocks along the width direction of the strip-shaped blocks; The butt ends of the two conductive sections are in cross-shaped insertion connection, four embedded grooves are formed, and the embedded blocks are arranged in the embedded grooves in a one-to-one correspondence mode, so that the monofilament is of a cylindrical structure as a whole. The application forms a cross clamping design, increases the contact area of copper and aluminum and forms radial limit, thereby improving the mechanical connection strength of the copper and aluminum interface, dispersing stress concentration, reducing the fracture risk of welding spots, effectively reducing the current density of the contact interface, reducing local resistance, improving electrical performance, arranging an embedded block in an embedded groove in a fusion manner, realizing metallurgical bonding, integrating a copper wire section and an aluminum wire section, forming seamless connection, ensuring firm connection, obviously enhancing the integral mechanical strength of a monofilament, keeping the integral cylindrical structure of the monofilament, ensuring the extrusion stability of a cable insulation layer, improving flexibility, ensuring that the stress distribution of the monofilament is more uniform when the monofilament is bent or twisted, and being suitable for complex wiring scenes. Based on the technical scheme, the scheme of the application can be improved as follows: by adopting the scheme, the conductive performance, the mechanical stability and the process feasibility are obviously improved through multiple mechanisms such as structural matching, mechanical strengthening, contact optimization and the like. By adopting the scheme, the symmetry of the whole structure is ensured, the stress concentration or deformation caused by eccentricity is avoided, the stress of each layer of material is uniform, and the flexibility and fatigue resistance are obviously improved. By adopting the scheme, the contact area among the embedded block, the conductive segment and the strip block is maximized, so that the current density in unit area can be reduced, the contact resistance is reduced, the mechanical connection strength of a copper-aluminum interface is improved, the stress concentration is dispersed, and the fracture risk of a welding spot is reduced. By adopting the scheme, the joint of the strip-shaped block and the conductive segment forms continuous curvature transition, stress concentra