A new type of fusion polyethylene cable y-shaped seamless crosslinking structure

Abstract

The utility model provides a novel welding formula polyethylene cable y type seamless crosslinking structure, including connecting sleeve, through shielding layer, even conductor surface electric field, avoid partial discharge, through insulating layer, high temperature (90°C~130°C) resistance, high dielectric strength, environmental stress cracking resistance, through insulating shielding layer, with insulating layer close adhesion, even electric field distribution, reduce the risk of partial discharge at insulating interface, through metal shielding layer, short -circuit current conduction passage, electromagnetic shield, reduce the outside interference, mechanical protection, through outer sheath, waterproof, prevent chemical corrosion, prevent ultraviolet, mechanical protection, resist wear and tear in the laying or operation, through filling layer, fill multicore cable gap, keep structure round, prevent longitudinal water seepage, add peroxide crosslinking agent when extruding polyethylene insulating layer, make polyethylene molecular chain crosslinking into three -dimensional net structure through high temperature (such as three layer co -extrusion process), insulating layer is continuously formed in the production line, no subsection joint.

Description

Technical Field

[0001] This utility model relates to a novel Y-type seamless cross-linking structure for fusion-bonded polyethylene cables, belonging to the field of cross-linking structure technology. Background Technology

[0002] Cross-linked cable is short for cross-linked polyethylene insulated cable. Cross-linked cables are suitable for power transmission and distribution lines with AC voltage of kV and below. Most high-voltage cables use cross-linked polyethylene insulation; cross-linked cable generally refers to a cable whose insulation layer uses cross-linked materials.

[0003] Chinese Patent Publication No. (CN 220856182 U) discloses an environmentally friendly flame-retardant cross-linked cable, comprising an environmentally friendly insulating protective sleeve body, an internal flame-retardant layer for the cable, and an internal hydrogenated nitrile rubber layer. This environmentally friendly flame-retardant cross-linked cable, through the inclusion of a flame-retardant mechanism, allows the user to fix the cable protective layer to the environmentally friendly insulating protective sleeve body by inserting it into the protective sleeve's insertion hole, and to fix the cable flame-retardant layer to the polyurethane layer by inserting it into the polyurethane layer's insertion hole. The user utilizes a flame-retardant filling layer, an ethylene propylene rubber layer, a chlorohydrin rubber layer, and a hydrogenated nitrile rubber layer within the flame-retardant layer. These layers, along with an oxygen-free copper core, cable insulation layer, and cable shielding layer, work in conjunction with these components, solving the problem of poor flame-retardant performance in existing medium-voltage cross-linked cables and realizing the flame-retardant function of this environmentally friendly flame-retardant cross-linked cable.

[0004] However, gaps can easily appear when cables are Y-connected, which reduces the service life of the cables during use.

[0005] To address this, a novel Y-type seamless cross-linking structure for fusion-bonded polyethylene cables is proposed. Summary of the Invention

[0006] In view of this, the present invention provides a novel Y-type seamless cross-linked structure for fusion-bonded polyethylene cables to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0007] The technical solution of this utility model is implemented as follows: A novel fusion-bonded polyethylene cable Y-type seamless cross-linked structure includes a connecting sleeve, a cable fixedly connected inside the connecting sleeve, a conductor inside the cable, and a protective layer on the outside of the conductor. The protective layer consists of a shielding layer, an insulation layer, an insulating shielding layer, a metal shielding layer, an outer sheath, and a filling layer. The inner side of the shielding layer is fixedly connected to the outer side of the conductor, the inner side of the insulation layer is fixedly connected to the outer side of the shielding layer, the inner side of the insulating shielding layer is fixedly connected to the outer side of the insulation layer, the inner side of the outer sheath is fixedly connected to the outer side of the metal shielding layer, and the inner side of the filling layer is fixedly connected to the outer side of the outer sheath.

[0008] More preferably, the shielding layer is made of a semi-conductive polymer, the insulating layer is made of cross-linked polyethylene, the insulating shielding layer is made of a semi-conductive tape, and the metal shielding layer is made of an aluminum-plastic composite tape.

[0009] More preferably, the outer sheath is made of halogen-free flame-retardant polyolefin, and the filler layer is made of polypropylene rope.

[0010] More preferably, the connecting sleeve is provided with a heat-shrinkable / cold-shrinkable cross-linked polyethylene sleeve inside, and the connecting sleeve is provided with a sheath and a shielding tube inside.

[0011] More preferably, the sheath is made of heat shrink tubing, injection-molded PE / PVC, or cold shrink tubing to restore waterproofing and mechanical protection, and the shielding tube is made of pre-formed shielding tube.

[0012] The present invention has the following advantages due to the adoption of the above technical solution:

[0013] I. This utility model utilizes a shielding layer to uniformly distribute the electric field on the conductor surface, preventing partial discharge. An insulation layer provides high temperature resistance (90°C~130°C), high dielectric strength, and resistance to environmental stress cracking. An insulating shielding layer, tightly bonded to the insulation layer, ensures uniform electric field distribution, reducing the risk of partial discharge at the insulation interface. A metal shielding layer provides a short-circuit current conduction path, electromagnetic shielding, reduced external interference, and mechanical protection. An outer sheath provides waterproofing, chemical corrosion resistance, UV protection, mechanical protection, and resistance to wear during laying or operation. A filling layer fills the gaps in multi-core cables, maintaining structural integrity and preventing longitudinal water seepage. A peroxide crosslinking agent is added during the extrusion of the polyethylene insulation layer, and high temperature (such as a three-layer co-extrusion process) causes the polyethylene molecular chains to crosslink into a three-dimensional network structure. The insulation layer is continuously formed in the production line without segmented seams.

[0014] II. This utility model uses an outer sheath to heat and melt XLPE material, allowing it to seamlessly fuse with the cable insulation layer. The connector sleeve with a pre-embedded heating wire is heated by electricity and then fused with the insulation layer. The sheath restores waterproof and mechanical protection, and the shielding tube ensures the continuity of the electric field.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional front view structural diagram of the present invention;

[0018] Figure 2 This is a bottom view of the connecting sleeve of this utility model.

[0019] Figure 3 This is a cross-sectional structural diagram of the conductor of this utility model;

[0020] Figure 4 This is a cross-sectional structural diagram of the connecting sleeve of this utility model.

[0021] Reference numerals: 1. Connecting sleeve; 2. Cable; 3. Conductor; 4. Protective layer; 401. Shielding layer; 402. Insulation layer; 403. Insulating shielding layer; 404. Metallic shielding layer; 405. Outer sheath; 406. Filler layer; 5. Heat-shrink / cold-shrink cross-linked polyethylene sheath; 6. Sheath; 7. Sheath; 8. Shielding tube. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] Example 1: As Figure 1-3As shown, this utility model embodiment provides a novel fusion-welded polyethylene cable Y-type seamless cross-linked structure, including a connecting sleeve 1. A cable 2 is fixedly connected inside the connecting sleeve 1. A conductor 3 is provided inside the cable 2. A protective layer 4 is provided on the outside of the conductor 3. The protective layer 4 consists of a shielding layer 401, an insulation layer 402, an insulating shielding layer 403, a metal shielding layer 404, an outer sheath 405, and a filling layer 406. The inner side of the shielding layer 401 is fixedly connected to the outer side of the conductor 3, and the inner side of the insulation layer 402 is fixedly connected to the outer side of the shielding layer 401. On the side, the inner side of the insulating shielding layer 403 is fixedly connected to the outer side of the insulating layer 402, the inner side of the outer sheath 405 is fixedly connected to the outer side of the metal shielding layer 404, and the inner side of the filling layer 406 is fixedly connected to the outer side of the outer sheath 405. The material of the shielding layer 401 is a semi-conductive polymer, the material of the insulating layer 402 is cross-linked polyethylene, the material of the insulating shielding layer 403 is a semi-conductive tape, the material of the metal shielding layer 404 is an aluminum-plastic composite tape, the material of the outer sheath 405 is a halogen-free flame-retardant polyolefin, and the material of the filling layer 406 is a polypropylene rope.

[0025] The shielding layer 401 creates a uniform electric field on the conductor surface, preventing partial discharge. The insulation layer 402 is heat-resistant (90°C~130°C), has high dielectric strength, and resists environmental stress cracking. The insulating shielding layer 403 is tightly bonded to the insulation layer 402, creating a uniform electric field distribution and reducing the risk of partial discharge at the insulation interface. The metal shielding layer 404 provides a short-circuit current conduction path, electromagnetic shielding, reduces external interference, and offers mechanical protection. The outer sheath 405 is waterproof, chemically resistant, UV-resistant, and provides mechanical protection, resisting wear during laying or operation. The filling layer 406 fills the gaps in the multi-core cable, maintaining a rounded structure and preventing longitudinal water seepage. Peroxide crosslinking agents are added during the extrusion of the polyethylene insulation layer 402, and the polyethylene molecular chains are crosslinked into a three-dimensional network structure through a high-temperature process such as a three-layer co-extrusion process. The insulation layer 402 is continuously formed in the production line without segmented seams.

[0026] Example 2: Figure 1 and 4 As shown, in one embodiment, the connecting sleeve 1 is provided with a heat-shrink / cold-shrink cross-linked polyethylene sleeve 5 inside, and a sheath 7 and a shielding tube 8 are provided inside the connecting sleeve 1. The sheath 7 is made of heat-shrink tubing, injection-molded PE / PVC or cold-shrink tubing, restoring waterproof and mechanical protection. The shielding tube 8 is made of pre-formed shielding tube 8.

[0027] The outer sheath 405 heats and melts the XLPE material, allowing it to seamlessly fuse with the cable 2 insulation layer 402. Using the pre-embedded heating wire connector sleeve, it is heated by electricity and fused with the insulation layer 402. The sheath 7 restores waterproof and mechanical protection, and the shielding tube 8 ensures the continuity of the electric field.

[0028] In operation, this invention ensures a continuous electric field through the shielding tube 8. The shielding layer 401, insulation layer 402, insulating shielding layer 403, metal shielding layer 404, outer sheath 405, and filling layer 406 provide ample protection for the cable 2. The shielding layer 401 creates a uniform electric field on the conductor surface, preventing partial discharge. The insulation layer 402 is heat-resistant (90°C~130°C), has high dielectric strength, and resists environmental stress cracking. The insulating shielding layer 403, tightly bonded to the insulation layer 402, provides a uniform electric field distribution, reducing the risk of partial discharge at the insulation interface. The metal shielding layer 404 provides a short-circuit current conduction path, electromagnetic shielding, reduces external interference, and mechanical protection. The outer sheath 405 provides waterproofing, chemical corrosion resistance, UV protection, mechanical protection, and resistance to wear during laying or operation. The filler layer 406 fills the gaps in the multi-core cable, maintains the structural integrity, and prevents longitudinal water seepage. During connection, a peroxide crosslinking agent is added when extruding the polyethylene insulation layer 402. Through a high-temperature process such as a three-layer co-extrusion process, the polyethylene molecular chains are crosslinked into a three-dimensional network structure. The insulation layer 402 is continuously formed in the production line without segmented seams.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A novel fusion-bonded polyethylene cable Y-type seamless cross-linked structure, comprising a connecting sleeve (1), characterized in that: The connecting sleeve (1) is fixedly connected to a cable (2), and the cable (2) is provided with a conductor (3). A protective layer (4) is provided on the outside of the conductor (3). The protective layer (4) consists of a shielding layer (401), an insulation layer (402), an insulating shielding layer (403), a metal shielding layer (404), an outer sheath (405), and a filling layer (406). The inner side of the shielding layer (401) is fixedly connected to the outside of the conductor (3). The inner side of the insulation layer (402) is fixedly connected to the outside of the shielding layer (401). The inner side of the insulating shielding layer (403) is fixedly connected to the outside of the insulation layer (402). The inner side of the outer sheath (405) is fixedly connected to the outside of the metal shielding layer (404). The inner side of the filling layer (406) is fixedly connected to the outside of the outer sheath (405).

2. The novel fusion-bonded polyethylene cable Y-type seamless cross-linking structure according to claim 1, characterized in that: The shielding layer (401) is made of a semi-conductive polymer, the insulating layer (402) is made of cross-linked polyethylene, the insulating shielding layer (403) is made of a semi-conductive tape, and the metal shielding layer (404) is made of an aluminum-plastic composite tape.

3. The novel fusion-bonded polyethylene cable Y-type seamless cross-linking structure according to claim 1, characterized in that: The outer sheath (405) is made of halogen-free flame-retardant polyolefin, and the filler layer (406) is made of polypropylene rope.

4. The novel fusion-bonded polyethylene cable Y-type seamless cross-linking structure according to claim 1, characterized in that: The connecting sleeve (1) is provided with a heat-shrinkable / cold-shrinkable cross-linked polyethylene sleeve (5) inside, and a sheath (7) and a shielding tube (8) are provided inside the connecting sleeve (1).

5. The novel fusion-bonded polyethylene cable Y-type seamless cross-linking structure according to claim 4, characterized in that: The sheath (7) is made of heat shrink tubing, injection molded PE / PVC or cold shrink tubing to restore waterproof and mechanical protection, and the shielding tube (8) is made of prefabricated shielding tube (8).

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