Flexible mineral insulation corrugated copper sheath pre-branched cable structure

Abstract

The invention relates to a flexible mineral insulation corrugated copper sheath pre-branch cable structure comprising a main cable which is provided with a plurality of conductor connecting wire clamps; the branch cable is connected with the conductor connecting wire clamp; the outer injection molding sheath is extruded at the branch connection position of the plurality of branch cables and the main cable; the mineral comprehensive insulator is used for filling gaps between the plurality of branch cables and the main cable; and the metal sheath continuous layer comprises a copper strip, a main cable copper wire and a branch cable copper wire. The flexible mineral insulation corrugated copper sheath pre-branch cable structure belongs to a low-voltage 0.6 / 1kV flexible mineral insulation corrugated copper sheath pre-branch cable structure and branch connector processing technology optimization, the cable is unique in design, the problem that a metal sheath cable connector is tedious can be effectively solved, the sealing effect of the connector is improved, the later maintenance cost is reduced, and the service life of the cable is prolonged. And the operation stability of the cable is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a flexible mineral insulated corrugated copper sheathed pre-branching cable structure. Background Art

[0002] In recent years, with the acceleration of my country's urbanization process, building fire accidents have occurred frequently, and electrical lines are an important cause of building fires. According to statistics, accidents caused by unstable operation of electrical lines due to the poor stability of traditional branch wiring methods account for a large proportion. Important building sites, such as crowded places: shopping malls, theaters, hotels; important buildings: high-end residential buildings, high-rise buildings, bank buildings, office buildings, subways, etc., have caused huge losses due to fire accidents, so pre-branching cables with stable and reliable performance are of great significance to the power transmission system.

[0003] In the power supply system of buildings, subways and tunnels, power cables are important units used to connect the power distribution end and the power equipment. Usually, a main cable and multiple branch line cables are connected.

[0004] However, the traditional branching method has many disadvantages. The traditional construction method is to strip the outer sheath and inner insulation of a section of the main cable on site, and then connect the cable head of the branch main cable with the sheath and insulation stripped off to the main cable conductor with the insulation stripped off. Use hydraulic pliers or other methods to crimp through the conductor connector, and finally encapsulate it with relevant insulating materials. This on-site construction method is difficult, has high technical requirements, long cycle time, and high on-site construction costs; at the same time, there are also problems such as difficulty in ensuring insulation strength, poor reliability and consistency, and failure to ensure insulation resistance at the joint and conduction of the metal sheath of the metal sheathed cable. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the connection method of the trunk cable and multiple branch line cables in the prior art is not only complicated in construction, but also the reliability cannot be guaranteed during use.

[0006] In order to solve the above technical problems, the present invention provides a flexible mineral insulated corrugated copper sheathed pre-branching cable structure, comprising: a trunk cable, which is the main body of the cable, and the trunk cable is provided with a plurality of conductor connection clamps; a branch cable, which is arranged in a plurality of ways, and the branch cables and the conductor connection clamps are arranged one by one, and the branch cables and the conductor connection clamps are connected; an outer injection-molded sheath, which is extruded at the branch connection positions of the plurality of branch cables and the trunk cable; a mineral composite insulator, which is arranged in the outer injection-molded sheath, and the mineral composite insulator is used to wrap around the conductors of the plurality of branch cables and the trunk cable and fill in the gap position outside the insulating core; a continuous layer of a metal sheath, which comprises a copper strip, a main cable copper wire and a branch cable copper wire, and the main cable copper wire is wound on the outer wall of the mineral composite insulator outside the trunk cable, and the main cable copper wire is wound on the outer wall of the mineral composite insulator outside the trunk cable, and the main cable copper wire is wound on the outer wall of the mineral composite insulator outside the trunk cable. The wire and the metal sheath are connected, the copper belt is wound on the outer wall of the mineral composite insulator at the branch connection position of the several branch cables and the main cable, and the copper belt extends out of the end of the branch cable away from the conductor connecting clamp, the copper belt is welded to the metal sheath, and the parts of the several branch cables extending out of the copper belt are wound with branch cable copper wire, the branch cable copper wire is located on the outer wall of the mineral composite insulator outside the branch cable, and the branch cable copper wire and the metal sheath are connected. The flexible mineral insulated corrugated copper sheath pre-branching cable structure of the present invention belongs to the structure of the low-voltage 0.6 / 1kV flexible mineral insulated corrugated copper sheath pre-branching cable and the branch connector processing technology optimization. The cable has a unique design, which can effectively solve the cumbersome metal sheath cable joints, improve the joint sealing effect, reduce the later maintenance cost, and improve the stability of cable operation.

[0007] In one embodiment of the present invention, the trunk cable is provided with a main cable metal sheath and a main cable non-metallic sheath, and the main cable metal sheath and the main cable non-metallic sheath are respectively located at both ends of branch connection positions between a plurality of branch cables and the trunk cable.

[0008] In one embodiment of the present invention, one end of the plurality of branch cables away from the main cable is connected with a branch cable metal sheath.

[0009] In one embodiment of the present invention, through hole one and hole two are provided on the metal sheath of the main cable, the copper belt is spirally wound around the outer layer of the trunk cable, and the two ends of the copper wire of the main cable are respectively connected to through hole one and through hole two.

[0010] In one embodiment of the present invention, the branch cable copper wire is arranged on the outer layer of the branch cable, and two ends of the branch cable copper wire are respectively connected to the copper tape and the branch cable metal sheath.

[0011] In one embodiment of the present invention, the copper belt is arranged in a spiral shape, and two ends of the copper belt are respectively connected to the metal sheaths at two ends of the main cable.

[0012] In one embodiment of the present invention, the copper tape is welded to the surface of the copper wire of the main cable.

[0013] In one embodiment of the present invention, the trunk cable and the branch cable have the same structure, and both the trunk cable and the branch cable include a plurality of battery cells, a filling layer, a protective layer, a corrugated copper sheath and a non-metallic protective layer. The plurality of battery cells are twisted together, the protective layer is wrapped around the outside of the plurality of battery cells, the filling layer is filled between the plurality of battery cells and the protective layer, the corrugated copper sheath is sleeved on the outside of the protective layer, and the non-metallic protective layer is sleeved on the outside of the corrugated copper sheath.

[0014] In one embodiment of the present invention, the battery core includes a conductor, a wrapped mineral insulation and an extruded phase-separated mineral insulation layer, wherein the wrapped mineral insulation is sleeved outside the conductor, and the extruded phase-separated mineral insulation layer is sleeved outside the wrapped mineral insulation.

[0015] In one embodiment of the present invention, the filling layer is a flame retardant material.

[0016] The above technical solution of the present invention has the following beneficial effects compared with the prior art: The flexible mineral insulated corrugated copper sheathed pre-branching cable structure described in the present invention has excellent insulation strength, reliability and consistency, and can effectively solve the problems of poor insulation strength, non-conductivity of the metal sheath, poor reliability and consistency in the traditional on-site joint construction method, so that it has lower construction costs and smaller occupied space; in addition, it can effectively solve the technical problems of high cost and large occupied space of cable transfer boxes.

[0017] The entire technical solution fully considers the customer's dependence on mineral insulated cables and the cumbersomeness and risks of conventional metal sheathed cable branching methods. Therefore, the design and implementation of this technical solution can effectively improve the overall performance and reliability of the cable system, while also reducing construction and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 It is a cross-sectional view of the structure of a flexible mineral insulated corrugated copper sheathed pre-branching cable in a preferred embodiment of the present invention; Figure 2 This is a process diagram of a flexible mineral insulated corrugated copper sheathed pre-branching cable structure in a preferred embodiment of the present invention; Figure 3 It is a cross-sectional view of a trunk cable or a branch cable in a preferred embodiment of the present invention.

[0019] Explanation of the reference numerals in the specification: main cable 1, battery core 11, conductor 111, wrapped mineral insulation 112, extruded phase-separated mineral insulation layer 113, filling layer 12, protective layer 13, corrugated copper sheath 14, non-metallic protective layer 15, conductor connecting wire clamp 2, branch cable 3, outer injection molded sheath 4, mineral composite insulator 5, metal sheath continuous layer 6, copper tape 61, main cable copper wire 62, branch cable copper wire 63, main cable metal sheath 7, through hole one 71, through hole two 72, main cable non-metallic sheath 8, branch cable metal sheath 9. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Example

[0021] Reference Figure 1 , 2 As shown, the flexible mineral insulated corrugated copper sheathed pre-branching cable structure of the present invention comprises: a trunk cable 1, which is the main body of the cable, and the trunk cable 1 is provided with a plurality of conductor connection clamps 2; a plurality of branch cables 3, which are provided, and the conductors of the branch cables 3 and the conductor connection clamps 2 are provided one by one, and the conductors of the branch cables 3 and the conductor connection clamps 2 are connected; an outer injection-molded sheath 4, which is extruded at the branch connection positions of the plurality of branch cables 3 and the trunk cable 1; a mineral composite insulator 5, which is provided in the outer injection-molded sheath 4, and the mineral composite insulator 5 is wrapped and filled at the gap position between the plurality of branch cables 3 and the trunk cable 1; a metal sheath continuous layer 6, which comprises a copper tape 61, a main cable copper wire 6 2 and branch cable copper wire 63, the main cable copper wire 62 is arranged on the outer wall of the mineral composite insulator 5 outside the trunk cable 1, and the main cable copper wire 62 is in contact with the inner wall of the copper belt 63, the copper belt 61 is wound on the outer wall of the mineral composite insulator 5 at the branch connection position of the plurality of branch cables 3 and the trunk cable 1, and the copper belt 61 extends from one end of the branch cable 3 away from the conductor connection clamp 2, the copper belt 61 is connected to the outer injection molded sheath 4, the portion of the plurality of branch cables 3 extending from the copper belt 61 is provided with the branch cable copper wire 63, the branch cable copper wire 63 is located on the outer wall of the mineral composite insulator 5 outside the branch cable 3, and the branch cable copper wire 63 is in contact with the inner wall of the main cable copper wire 62. The copper belt 61 is welded to the surface of the main cable copper wire 62.

[0022] The metal sheath of the trunk cable 1 and the metal sheath of the branch cable 3 are connected together by punching holes and welding at the metal sheath using metal wires and metal strips of the same metal material with a sufficiently equivalent cross-section, so that the contact and conductivity at the connection are good, ensuring the integrity of the metal sheath while also ensuring the excellent fire resistance of the metal sheath.

[0023] In the above structure, the trunk cable 1 is provided with a main cable metal sheath 7 and a main cable non-metal sheath 8, and the main cable non-metal sheath 8 is located outside the metal sheath 7. The conductors of the plurality of branch cables 3 are connected to the branch cable metal sheath 9 at one end away from the trunk cable 1.

[0024] In the above structure, the main cable metal sheath 7 is provided with a through hole 1 71 and a through hole 2 72, the copper tape 61 is spirally wound around the outer layer of the trunk cable 1, and the two ends of the main cable copper wire 62 are respectively connected to the through hole 1 71 and the through hole 2 72. The main cable metal sheath 7 and the branch cable metal sheath 9 are respectively punched, and after the main cable copper wire is punched, the branch cable 3 and the main cable copper wire 7 are preliminarily fixed and connected, and after stabilization, a copper tape of corresponding thickness and width is wound and welded on the metal wire and the copper sheath surface to ensure the conduction of the metal sheath.

[0025] In the above structure, the branch cable copper wire 63 is arranged on the outer layer of the branch cable 3, and the two ends of the branch cable copper wire 63 are respectively connected to the copper belt 61 and the branch cable metal sheath 9. The copper belt 61 is arranged in a spiral shape, and the two ends of the copper belt 61 are respectively connected to the two ends of the main cable metal sheath 7. Example

[0026] Based on the structure of the first embodiment, refer to Figure 3 As shown, the trunk cable 1 and the branch cable 3 have the same structure, and both the trunk cable 1 and the branch cable 3 include a plurality of battery cells 11, a filling layer 12, a protective layer 13, a corrugated copper sheath 14 and a non-metallic protective layer 15. The plurality of battery cells 11 are twisted together, the protective layer 13 is wrapped around the outside of the plurality of battery cells 11, the filling layer 12 is filled between the plurality of battery cells 11 and the protective layer 13, the corrugated copper sheath 14 is sleeved outside the protective layer 13, and the non-metallic protective layer 15 is sleeved outside the corrugated copper sheath 14. The filling layer 12 is a flame retardant material.

[0027] In the above structure, the battery core 11 includes a conductor 111 , a wrapped mineral insulation 112 and an extruded phase-separated mineral insulation layer 113 . The wrapped mineral insulation 112 is sleeved outside the conductor 111 , and the extruded phase-separated mineral insulation layer 113 is sleeved outside the wrapped mineral insulation 112 .

[0028] The structure of the trunk cable 1 and the branch cable 3 of the present invention changes the original wrapped mineral insulation layer into a wrapped and extruded structure, which ensures the insulation resistance of the cable and prevents the mineral insulation layer from absorbing moisture, thereby ensuring the stability of the cable operation. By improving the connection method of the branch head, the integrity of the metal sheath is ensured while ensuring its role as a metal fire-resistant protective layer of the cable.

[0029] Extrusion in cables: should be extrusion, that is, extruding a layer of rubber outside the semi-finished product; longitudinal wrapping: a tape wrapping method, that is, dragging a layer of tape along the forward direction of the semi-finished product during extrusion to achieve the effect of isolating the outer sheath; wrapping: also a tape wrapping method, that is, when putting pairs, strands or groups of wires together, a layer of tape is wrapped around them to make them tightly and roundly wound together. Of course, if the next pass is extrusion, this layer of tape can also play a role in isolating and protecting the internal structure.

[0030] The improvement of the present invention adds an extruded phase-separated mineral insulation layer 113 outside the wrapped mineral insulation 112, which can ensure that the cable has excellent insulation performance while preventing moisture absorption of the mineral insulation layer.

[0031] The manufacturing method of the flexible mineral insulated corrugated copper sheathed pre-branching cable structure of the present invention is as follows: First, a C-type wire clamp, namely a conductor connection wire clamp 2 is used to fix the conductors 111 together, and the extruded phase-separated mineral insulation layer 113 is formed by wrapping the mineral insulation material around the wrapped mineral insulation layer 112 by injection molding.

[0032] Secondly, punch holes in the metal sheaths of the main cable 1 and the branch cable 3 respectively, and then pierce the main cable copper wire 62 and the branch cable copper wire 63 respectively, and then preliminarily fix the branch cable 3 and the main cable metal sheath 7 together. After stabilization, wrap and weld copper tape of corresponding thickness and width on the surface of the metal wire to ensure the conductivity of the metal sheath.

[0033] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A flexible mineral insulated corrugated copper sheathed pre-branching cable structure, characterized in that: include, A trunk cable (1), which is the main body of the cable, and a plurality of conductor connection clamps (2) are provided on the trunk cable (1); A branch cable (3) is provided in plurality, wherein the conductors of the branch cable (3) and the conductor connecting clamps (2) are provided in one-to-one correspondence, and the conductors of the branch cable (3) and the conductor connecting clamps (2) are connected; An outer injection-molded sheath (4) is extruded at the branch connection positions between the plurality of branch cables (3) and the trunk cable (1); A mineral composite insulator (5) is arranged in the outer injection-molded sheath (4), and the mineral composite insulator (5) is used to wrap and fill the gaps between the plurality of branch cables (3) and the trunk cable (1); A metal sheath continuous layer (6), comprising a copper tape (61), a main cable copper wire (62) and a branch cable copper wire (63), wherein the main cable copper wire (62) is wound on the outer wall of a mineral composite insulator (5) outside a trunk cable (1), and the main cable copper wire (62) is in contact with the inner wall of the copper tape (61), the copper tape (61) is wound on the outer wall of the main cable copper wire (62), and the conductor of the branch cable (3) extends out of the copper tape (61) at one end away from the conductor connection clamp (2), and the copper tape (61) is in contact with the inner wall of an outer injection-molded sheath (4), and the conductors of the plurality of branch cables (3) extending out of the copper tape (61) are wound with branch cable copper wires (63), and the branch cable copper wires (63) are located on the outer wall of a mineral composite insulator (5) outside the conductor of the branch cable (3), and the branch cable copper wires (63) are in contact with the inner wall of the outer injection-molded sheath (4).

2. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 1 is characterized in that: A main cable metal sheath (7) and a main cable non-metal sheath (8) are provided on the conductor of the trunk cable (1); the main cable metal sheath (7) and the main cable non-metal sheath (8) are respectively located at two ends of a branch connection position between a branch cable (9) and the conductor of the trunk cable (1).

3. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 2 is characterized in that: One end of the conductors (3) of the plurality of branch cables, which is away from the conductor (1) of the trunk cable, is connected to a branch cable metal sheath (9).

4. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 2 is characterized in that: The main cable metal sheath (7) is provided with a first through hole (71) and a second through hole (72); the copper tape (61) is spirally wound around the outer layer of the trunk cable (1); and the two ends of the main cable copper wire (62) are respectively connected to the first through hole (71) and the second through hole (71).

5. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 3 is characterized by: The branch cable copper wire (63) is arranged on the outer layer of the conductor of the branch cable (3), and two ends of the branch cable copper wire (63) are respectively connected to the copper tape (61) and the branch cable metal sheath (9).

6. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 2 is characterized in that: The copper belt (61) is arranged in a spiral shape, and two ends of the copper belt (61) are connected to the main cable metal sheath (7).

7. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 6 is characterized in that: The copper strip (61) is welded to the surface of the main cable copper wire (62).

8. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 1 is characterized by: The trunk cable (1) and the branch cable (3) have the same structure, and both the trunk cable (1) and the branch cable (3) comprise a plurality of battery cores (11), a filling layer (12), a protective layer (13), a corrugated copper sheath (14), and a non-metallic protective layer (15); the plurality of battery cores (11) are twisted together; the protective layer (13) is wrapped around the outside of the plurality of battery cores (11); the filling layer (12) is filled between the plurality of battery cores (11) and the protective layer (13); the corrugated copper sheath (14) is sleeved on the outside of the protective layer (13); and the non-metallic protective layer (15) is sleeved on the outside of the corrugated copper sheath (14).

9. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 8, characterized in that: The battery core (11) comprises a conductor (111), a wrapped mineral insulation (112) and an extruded phase-separated mineral insulation layer (113); the wrapped mineral insulation (112) is sleeved outside the conductor (111), and the extruded phase-separated mineral insulation layer (113) is sleeved outside the wrapped mineral insulation (112).

10. The flexible mineral insulated corrugated copper sheathed pre-branching cable structure according to claim 8, characterized in that: The filling layer (12) is made of flame retardant material.

Images