Crosslinked polyethylene insulated low-smoke halogen-free flame-retardant fireproof power cable

Abstract

The utility model discloses a crosslinked polyethylene insulated low-smoke halogen-free flame-retardant fireproof power cable, which comprises an insulating layer, a flame-retardant layer is fixedly arranged on the circumferential outer wall of the insulating layer, the flame-retardant layer comprises a fireproof sheath, and connecting rubber is fixedly arranged on the two end surfaces of the fireproof sheath. The sides, close to each other, of the two pieces of connecting rubber protrude outwards to form bonding parts, the two bonding parts are bonded through glue, and two V-shaped cutting seams which are arranged inside and outside are formed in the sides, bonded to each other, of the two pieces of connecting rubber. The fireproof sheath is formed by solidifying and shaping asbestos fibers and fireproof gel, the high temperature resistance of the asbestos fibers and the fireproof gel is far higher than that of the material of the wear-resistant layer, and when the wear-resistant layer is on fire and burns to the flame-retardant layer, the flame-retardant layer can improve the fireproof effect of the cable. And the flame-retardant layer can be stripped conveniently when an operator cuts off the cable for connection.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a cross-linked polyethylene insulated low-smoke, halogen-free, flame-retardant and fire-resistant power cable. Background Art

[0002] Power cables are cables used to transmit and distribute electrical energy. Power cables are commonly used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of cables is gradually increasing. Power cables are cable products used to transmit and distribute high-power electrical energy in the trunk lines of the power system.

[0003] In the existing technology, such as the document with announcement number CN218866752U, a cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable is specifically disclosed. The power cable in the document is provided with a flame-retardant outer layer, and a wear-resistant layer is fixed on the outer wall of the flame-retardant outer layer. The flame-retardant outer layer is made of chloroprene rubber, and the wear-resistant layer is made of nitrile rubber. The high temperature resistance of chloroprene rubber is generally lower than that of nitrile rubber. The power cable is usually affected by the external ignition point and burns. When the wear-resistant layer burns, the flame-retardant outer layer will also be ignited, resulting in poor fireproof effect of the flame-retardant outer layer. For this reason, we propose a cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable. Utility Model Content

[0004] Based on the technical problem that the power cable in the prior art is provided with a flame retardant outer layer, and a wear-resistant layer is fixed on the outer wall of the flame retardant outer layer, the flame retardant outer layer is made of chloroprene rubber, and the wear-resistant layer is made of nitrile rubber, and the high temperature resistance of chloroprene rubber is generally lower than that of nitrile rubber, the power cable is usually affected by the external ignition point and burns, when the wear-resistant layer burns, the flame retardant outer layer will also be ignited, resulting in poor fireproof effect of the flame retardant outer layer, the utility model proposes a cross-linked polyethylene insulated low-smoke halogen-free flame retardant and fire-resistant power cable.

[0005] The utility model proposes a cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable, comprising an insulating layer, a flame-retardant layer is fixedly arranged on the circumferential outer wall of the insulating layer, the flame-retardant layer comprises a fire-proof sheath, connecting rubbers are fixedly arranged on both end surfaces of the fire-proof sheath, two connecting rubbers are convexly formed with bonding parts on one side close to each other, the two bonding parts are bonded to each other by glue, and two V-shaped cutting seams arranged inside and outside are formed on one side where the two connecting rubbers are bonded to each other.

[0006] Preferably, a filling layer is fixedly disposed on the inner wall of the insulating layer, a plurality of polyethylene layers are fixedly disposed on the inner wall of the filling layer, and a copper conductor is fixedly disposed on the inner walls of the plurality of polyethylene layers.

[0007] Preferably, a puncture-proof sleeve is fixedly provided on the circumferential outer wall of the flame-retardant layer, a waterproof layer is fixedly provided on the circumferential outer wall of the puncture-proof sleeve, and a wear-resistant layer is fixedly provided on the circumferential outer wall of the waterproof layer.

[0008] Preferably, the fireproof sheath is formed by solidifying and shaping asbestos fibers and fireproof glue, and the fireproof sheath is bent into a circular ring structure.

[0009] Preferably, the puncture-proof sleeve comprises a metal layer, and the first fiber layer is fixedly disposed on the top and bottom of the metal layer.

[0010] Preferably, a second fiber layer is fixedly arranged on the top of the first fiber layer, and a blended layer is fixedly arranged on the bottom of the first fiber layer.

[0011] The beneficial effects of the present invention are:

[0012] 1. The fireproof sheath is formed by solidifying asbestos fiber and fireproof glue. The high temperature resistance of asbestos fiber and fireproof glue is much higher than that of the wear-resistant layer. When the wear-resistant layer is on fire, the ignition point burns to the flame-retardant layer, and the flame-retardant layer can improve the fireproof effect of the cable.

[0013] 2. The anti-puncture sleeve includes a metal layer, a first fiber layer, a second fiber layer and a blended layer. The first fiber layer is woven from aramid fiber, the second fiber layer is woven from polyethylene fiber, and the blended layer is blended from multiple groups of staggered Kevlar threads, thereby improving the anti-puncture performance of the cable.

[0014] 3. By forming a cutting seam on one side where the two connecting rubbers are adhered to each other, it is convenient for operators to peel off the flame retardant layer when cutting the cable for connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 For this utility model Figure 2 The enlarged view of point A in the middle;

[0018] Figure 3 It is a schematic diagram of the anti-puncture sleeve of the utility model.

[0019] In the figure: 1, wear-resistant layer; 2, waterproof layer; 3, anti-puncture sleeve; 301, metal layer; 302, first fiber layer; 303, second fiber layer; 304, blended layer; 4, flame retardant layer; 401, fireproof sheath; 402, connecting rubber; 403, bonding part; 404, cutting seam; 5, insulating layer; 6, filling layer; 7, polyethylene layer; 8, copper conductor. DETAILED DESCRIPTION

[0020] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "connection and fixation" and "fixed installation" should be understood in a broad sense. For example, "fixed installation" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or a direct connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figure 1 and Figure 2 As shown, a cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable comprises an insulating layer 5, a flame-retardant layer 4 is fixedly arranged on the circumferential outer wall of the insulating layer 5, the flame-retardant layer 4 comprises a fire-resistant sheath 401, connecting rubbers 402 are fixedly arranged on both end faces of the fire-resistant sheath 401, and the two connecting rubbers 402 are convexly formed with bonding parts 403 on the sides close to each other, and the two bonding parts 403 are bonded to each other by glue, and two V-shaped cutting seams 404 arranged inside and outside are formed on the sides where the two connecting rubbers 402 are bonded to each other, and the fire-resistant sheath 401 is formed by solidifying and shaping asbestos fiber and fire-resistant glue, and the fire-resistant sheath 401 is bent into a circular ring structure, and the high temperature resistance of the asbestos fiber and the fire-resistant gel is much higher than the high temperature resistance of the material of the wear-resistant layer 1, and when the wear-resistant layer 1 catches fire, when the ignition point burns to the flame-retardant layer 4, the flame-retardant layer 4 can have a good fire-proof effect.

[0022] like Figure 1 As shown, the insulating layer 5 adopts cross-linked polyethylene insulating material, the inner wall of the insulating layer 5 is fixedly provided with a filling layer 6, the filling layer 6 is a polypropylene belt, the inner wall of the filling layer 6 is fixedly provided with multiple polyethylene layers 7, the inner walls of the multiple polyethylene layers 7 are fixedly provided with copper conductors 8, the circumferential outer wall of the flame retardant layer 4 is fixedly provided with an anti-puncture sleeve 3, the circumferential outer wall of the anti-puncture sleeve 3 is fixedly provided with a waterproof layer 2, the waterproof layer 2 adopts polyurethane waterproof coating, the set waterproof layer 2 can play a waterproof effect, prevent external water from entering the cable, thereby improving the moisture-proof performance of the cable, the circumferential outer wall of the waterproof layer 2 is fixedly provided with a wear-resistant layer 1, the wear-resistant layer 1 adopts halogen-free low-smoke flame-retardant polyolefin material with oxygen index, smoke density, crusting and other parameters that meet the standards, the extrusion surface is required to be smooth and round, the cross section should have no pores visible to normal vision, and there should be no obvious burning drips during the flame combustion process.

[0023] like Figure 3 As shown, the anti-puncture sleeve 3 includes a metal layer 301, which is woven from criss-crossed metal wires. A first fiber layer 302 is fixedly arranged on the top and bottom of the metal layer 301, and the first fiber layer 302 is woven from aramid fibers. A second fiber layer 303 is fixedly arranged on the top of the first fiber layer 302, and the second fiber layer 303 is woven from polyethylene fibers. A blended layer 304 is fixedly arranged on the bottom of the first fiber layer 302, and the blended layer 304 is blended from a plurality of groups of interlaced Kevlar threads.

[0024] Working principle: The fireproof sheath 401 is formed by solidification of asbestos fiber and fireproof glue. The high temperature resistance of asbestos fiber and fireproof glue is much higher than that of the wear-resistant layer 1. When the wear-resistant layer 1 is on fire, when the ignition point burns to the flame-retardant layer 4, the flame-retardant layer 4 can play a good fireproofing effect.

[0025] The anti-puncture sleeve 3 includes a metal layer 301, a first fiber layer 302, a second fiber layer 303 and a blended layer 304. The first fiber layer 302 is woven from aramid fibers, the second fiber layer 303 is woven from polyethylene fibers, and the blended layer 304 is blended from multiple groups of staggered Kevlar threads, which can improve the anti-puncture performance of the cable. By forming a cutting seam 404 on one side where the two connecting rubbers 402 are adhered to each other, it is convenient for the operator to peel off the flame retardant layer 4 when cutting the cable for connection.

[0026] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cross-linked polyethylene insulated low-smoke, halogen-free, flame-retardant and fire-resistant power cable, comprising an insulating layer (5), Features: The circumferential outer wall of the insulating layer (5) is fixedly provided with a flame retardant layer (4), the flame retardant layer (4) includes a fireproof sheath (401), both end surfaces of the fireproof sheath (401) are fixedly provided with connecting rubbers (402), the two connecting rubbers (402) are close to each other on one side and are convexly formed with a bonding portion (403), the two bonding portions (403) are bonded to each other by glue, and the two connecting rubbers (402) are bonded to each other on one side and are formed with two V-shaped cutting seams (404) arranged inside and outside.

2. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 1, Features: A filling layer (6) is fixedly arranged on the inner wall of the insulating layer (5), a plurality of polyethylene layers (7) are fixedly arranged on the inner wall of the filling layer (6), and a copper conductor (8) is fixedly arranged on the inner wall of each of the plurality of polyethylene layers (7).

3. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 1, Features: The flame retardant layer (4) is provided with a puncture-proof sleeve (3) on its circumferential outer wall, the puncture-proof sleeve (3) is provided with a waterproof layer (2) on its circumferential outer wall, and the waterproof layer (2) is provided with a wear-resistant layer (1) on its circumferential outer wall.

4. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 1, Features: The fireproof sheath (401) is formed by solidifying asbestos fibers and fireproof glue, and the fireproof sheath (401) is bent into a circular ring structure.

5. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 3, Features: The anti-puncture sleeve (3) comprises a metal layer (301), and a first fiber layer (302) is fixedly arranged on the top and bottom of the metal layer (301).

6. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant and fire-resistant power cable according to claim 5, Features: A second fiber layer (303) is fixedly arranged on the top of the first fiber layer (302), and a blended layer (304) is fixedly arranged on the bottom of the first fiber layer (302).

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