Medium-voltage flame-retardant cable with thermal insulation composite material lining layer

Abstract

The utility model discloses a medium-voltage flame-retardant cable with a heat insulation composite material lining layer, relates to the technical field of medium-voltage flame-retardant cable structures, and aims to solve the problem that the use safety of the medium-voltage flame-retardant cable is affected due to the fact that a certain risk is easily caused when the interior of the conventional medium-voltage flame-retardant cable is overheated due to high temperature. According to the technical scheme, the cable is characterized by comprising a cable core, the cable core comprises wire cores and a filling layer, a wrapping layer is arranged outside the cable core, a lining layer is arranged outside the wrapping layer and comprises a cross-linked polyethylene sheath and a polyurethane sheath, a protective filling chamber is arranged in a gap between the polyurethane sheath and the cross-linked polyethylene sheath, and the cross-linked polyethylene sheath is arranged in the protective filling chamber. The interior of the protection filling chamber is filled with glass fiber ropes, the exterior of the lining layer is provided with an armor layer, and the exterior of the armor layer is provided with an outer sheath. And the effects of protecting the cable and having good flame retardant property are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of medium voltage flame-retardant cable structure, especially to a kind of heat-insulating composite material inner liner medium voltage flame-retardant cable. BACKGROUND

[0002] Flame-retardant cable refers to the sample being burned under specified test conditions, and the flame spread is only within the limited range after the test fire source is removed, and the afterflame or afterglow can self-extinguish within the limited time.The fundamental characteristic is: it can be burned under fire conditions and cannot operate, but it can prevent the spread of fire.In simple terms, if the wire catches fire, it can limit the burning to a local area and prevent it from spreading, saving other equipment and avoiding greater losses.

[0003] According to the search, the authorized announcement No.CN220509750U discloses a kind of heat-insulating composite material inner liner medium and high voltage fireproof cable, including conductor, the outer surface of the conductor is fixedly connected with composite inner liner, the outer surface of the composite inner liner is wound with wrapping layer, the outer surface of the wrapping layer is fixedly connected with outer sheath, the outer surface of the outer sheath is sleeved with glass fiber sheath, the bottom of the outer sheath is provided with slot, the inside of the slot is slidably connected with T-shaped rubber, one side of the outer surface of the glass fiber sheath is sleeved with fireproof ring.The utility model can quickly sleeve glass fiber sheath, and avoid cable from being abraded by convex strip, while ensuring the stability of glass fiber sheath installation, when fire occurs, glass fiber sheath can play a good fireproof and heat-insulating role, and further protection is carried out to the inside by composite inner liner, so that the cable can ensure good fireproof performance.

[0004] However, when the internal temperature of the existing medium voltage flame-retardant cable overheats, it can cause certain risks, affecting the safe use of the medium voltage flame-retardant cable, so there is an urgent need for a heat-insulating composite material inner liner medium voltage flame-retardant cable to solve these problems. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of heat-insulating composite material inner liner medium voltage flame-retardant cable, to solve the problem that the internal temperature of the existing medium voltage flame-retardant cable overheats, it can cause certain risks, affecting the safe use of the medium voltage flame-retardant cable in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0007] The application discloses a kind of heat-insulating composite inner liner medium-voltage flame-retardant cable, including cable core, the cable core includes wire core and filling layer, the outside of cable core is provided with wrapping layer, the outside of wrapping layer is provided with inner liner, the inner liner includes crosslinked polyethylene sheath and polyurethane sheath, crosslinked polyethylene sheath and polyurethane sheath gap are provided with protective filling chamber, the inside of protective filling chamber is filled with glass fiber rope, the outside of inner liner is provided with armored layer, the outside of armored layer is provided with outer sheath.

[0008] By adopting the above technical scheme, the medium-voltage flame-retardant cable has good flame-retardant and heat-insulating performance.

[0009] Further, the filling layer is filled in the gap between the cable core and the wire core, and the filling layer is made of polypropylene fibers.

[0010] By adopting the above technical scheme, the polypropylene fibers filled in the filling layer can make the medium-voltage flame-retardant cable have better flame-retardant effect, and can also buffer and protect the medium-voltage flame-retardant cable.

[0011] Further, the wire core includes a conductor, a shielding layer and an insulating sheath, the conductor is wrapped with the shielding layer, and the shielding layer is extruded with the insulating sheath.

[0012] By adopting the above technical scheme, the shielding layer wrapped around the conductor can make the medium-voltage flame-retardant cable have good shielding effect, and the insulating sheath can avoid the conductors from conducting electricity to each other.

[0013] Further, the conductor is twisted by copper wires, the shielding layer is an aluminum tape, and the insulating sheath is polyethylene.

[0014] By adopting the above technical scheme, the conductor twisted by copper wires has better structural strength, so that the conductor is not easy to break, thereby affecting the use of the conductor, and the polyethylene sheath can make the wire core have better insulation and shielding effect.

[0015] Further, the wrapping layer is a cotton yarn tape, and the wrapping layer is wrapped outside the filling layer.

[0016] By adopting the above technical scheme, the cotton yarn tape is wrapped around, so that the wire core and the filling layer 3 can be easily tightened, and the cotton yarn tape has excellent wear resistance and flame resistance.

[0017] Further, the glass fiber rope is twisted and packaged by a plurality of glass fiber wires, the glass fiber rope is wrapped outside the crosslinked polyethylene sheath, and the polyurethane sheath is extruded outside the glass fiber rope.

[0018] By adopting the technical scheme, the glass fiber rope is filled between the polyurethane sheath and the cross-linked polyethylene sheath, so that the medium-voltage flame-retardant cable has good tensile resistance, and when the medium-voltage flame-retardant cable is extruded, the glass fiber rope can be deformed by compression, so that the core is protected.

[0019] Further, the outside of the polyurethane sheath is provided with the flame-retardant coating, the flame-retardant coating is sprayed on the outside of the polyurethane sheath by a spraying process, and the thickness of the flame-retardant coating is 0.8-1.2 mm.

[0020] By adopting the technical scheme, the glass fiber rope is filled between the polyurethane sheath and the cross-linked polyethylene sheath, so that the medium-voltage flame-retardant cable has good tensile resistance, and when the medium-voltage flame-retardant cable is extruded, the glass fiber rope can be deformed by compression, so that the core is protected.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] 1、The utility model discloses a cross -woven glass fiber rope is filled in the cross -linked polyethylene sheath and the polyurethane sheath between the inside lining layer, so that the inside lining layer has good flame -retardant property, and the inside lining layer has good tensile property through the glass fiber rope, so that the medium -voltage flame -retardant cable has good tensile property, and when the medium -voltage flame -retardant cable is extruded, the deformation of the glass fiber rope arranged in the protection filling chamber, so that the core is not easy to be damaged by extrusion.

[0023] 2、The outside of the polyurethane sheath of the utility model is sprayed with 0.8-1.2mm flame -retardant coating by spraying process, so that the flame -retardant effect of the inside lining layer can be further improved, so that the medium -voltage flame -retardant cable has better flame -retardant property. DRAWINGS

[0024] Figure 1 It is the partial front view of the utility model;

[0025] Figure 2 It is the partial sectional view of the utility model;

[0026] Figure 3 It is the inside lining layer partial sectional view of the utility model;

[0027] Figure 4 It is the glass fiber rope perspective view of the utility model.

[0028] In the drawing: 1, cable core;2, core;3, filling layer;4, conductor;5, shielding layer;6, insulating sheath;7, wrapping layer;8, inside lining layer;9, armored layer;10, outer sheath;11, cross -linked polyethylene sheath;12, polyurethane sheath;13, protection filling chamber;14, glass fiber rope;15, flame -retardant coating. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0030] Please refer to Figures 1-4 The utility model provides an embodiment: a kind of heat-insulating composite material inner liner medium voltage flame-retardant cable, including cable core 1, cable core 1 includes wire core 2 and filling layer 3, cable core 1 is provided with wrapping layer 7 outside, wrapping layer 7 is provided with inner liner 8 outside, inner liner 8 includes crosslinked polyethylene sheath 11 and polyurethane sheath 12, polyurethane sheath 12 and crosslinked polyethylene sheath 11 gap are provided with protective filling chamber 13, protective filling chamber 13 is filled with glass fiber rope 14 inside, inner liner 8 is provided with armor layer 9 outside, armor layer 9 is provided with outer sheath 10 outside, filling layer 3 is filled in the gap of cable core 1 and wire core 2, and the polypropylene fiber of filling layer 3 is, wrapping layer 7 is cotton yarn belt, wrapping layer 7 is wrapped in the outside of filling layer 3, wherein the wire core 2 and filling layer 3 can be well wrapped by the wrapping layer 7 set, so as to avoid the wire core 2 and filling layer 3 appear scattered, the flame-retardant effect of medium voltage flame-retardant cable can be further improved by the inner liner 8 set, and the medium voltage flame-retardant cable can be well protected, the wire core 2 can be well protected by polypropylene fiber when the medium voltage flame-retardant cable is extruded and deformed outside by the filling layer 3 set by polypropylene fiber.

[0031] Please refer to Figure 1 Wire core 2 includes conductor 4, shielding layer 5 and insulating sheath 6, conductor 4 is wrapped with shielding layer 5 outside, shielding layer 5 is provided with insulating sheath 6 outside, conductor 4 is twisted by several copper wires, shielding layer 5 is aluminum strip, and insulating sheath 6 is polyethylene, wherein the conductor 4 twisted by several copper wires makes the conductor 4 have good structural strength, so that the conductor 4 is not prone to breakage, the wire core 2 has good electromagnetic shielding function by the aluminum strip shielding layer 5, and the conductors can have good insulation effect by the polyethylene insulating sheath 6, so as to avoid the conductors from being short-circuited, thereby affecting the use of the medium voltage flame-retardant cable.

[0032] Please refer to Figure 1, the glass fiber rope 14 is wound and packaged by several glass fiber lines, the glass fiber rope 14 is wound outside the crosslinked polyethylene sheath 11, the polyurethane sheath 12 is extruded outside the glass fiber rope 14, the outside of the polyurethane sheath 12 is provided with the fire-retardant coating 15, the fire-retardant coating 15 is sprayed on the outside of the polyurethane sheath 12 through a spraying process, and the thickness of the fire-retardant coating 15 is 0.8-1.2mm, wherein the fire-retardant coating 15 sprayed can make the inner lining 8 have good fire-retardant performance, and the glass fiber rope 14 can improve the tensile property of the inner lining 8, so that the medium-voltage fire-retardant cable has good tensile resistance, and meanwhile, when being extruded, the glass fiber rope 14 can be deformed, so that the core 2 can be well protected from damage.

[0033] Working principle: when in use, the crosslinked polyethylene sheath 11 and the polyurethane sheath 12 are filled with the cross-woven glass fiber rope 14 in the middle through the setting of the inner lining 8, so that the inner lining 8 has good fire-retardant performance, and meanwhile, the inner lining 8 has good tensile resistance through the glass fiber rope 14, so that the medium-voltage fire-retardant cable has good tensile resistance, when the medium-voltage fire-retardant cable is extruded, the glass fiber rope 14 arranged inside the protection filling chamber 13 is deformed, so that the core 2 is not easily damaged due to extrusion, the outside of the polyurethane sheath 12 is sprayed with the fire-retardant coating 15 of 0.8-1.2mm through a spraying process, so that the fire-retardant effect of the inner lining 8 can be further improved, so that the medium-voltage fire-retardant cable has better fire-retardant performance.

[0034] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but rather can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and are not limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to which they belong.

Claims

1. A medium voltage fire resistant cable with a thermal composite material inner jacket, comprising a cable core (1), characterized in that: The cable core (1) includes a wire core (2) and a filling layer (3), the outside of the cable core (1) is provided with a wrapping layer (7), the outside of the wrapping layer (7) is provided with an inner lining layer (8), the inner lining layer (8) includes a cross-linked polyethylene sheath (11) and a polyurethane sheath (12), the polyurethane sheath (12) and the cross-linked polyethylene sheath (11) are provided with a protective filling chamber (13) at the gap, the inside of the protective filling chamber (13) is filled with a glass fiber rope (14), the outside of the inner lining layer (8) is provided with an armor layer (9), the outside of the armor layer (9) is provided with an outer sheath (10).

2. A thermally insulated composite material inner sheath mid-voltage fire resistant cable according to claim 1, characterized in that: The filling layer (3) is filled at the gap between the cable core (1) and the wire core (2), and the filling layer (3) is a polypropylene fiber.

3. A thermally insulated composite material inner sheath mid-voltage fire resistant cable according to claim 2, characterized in that: The wire core (2) includes a conductor (4), a shielding layer (5) and an insulating sheath (6), the conductor (4) is wrapped with the shielding layer (5) outside, and the shielding layer (5) is extruded and wrapped with the insulating sheath (6) outside.

4. A thermally insulated composite material inner sheath layer medium voltage flame retardant cable according to claim 3, characterized in that: The conductor (4) is twisted by several copper wires, the shielding layer (5) is an aluminum strip, and the insulating sheath (6) is polyethylene.

5. A thermally insulated composite material inner sheath mid-voltage fire resistant cable according to claim 4, characterized in that: The wrapping layer (7) is a cotton yarn belt, and the wrapping layer (7) is wrapped outside the filling layer (3).

6. A thermally insulated composite material inner sheath mid-voltage fire resistant cable according to claim 5, characterized in that: The glass fiber rope (14) is wound and packaged by several glass fiber wires, the glass fiber rope (14) is wrapped outside the cross-linked polyethylene sheath (11), and the polyurethane sheath (12) is extruded and wrapped outside the glass fiber rope (14).

7. A thermally insulated composite material inner sheath mid-voltage fire resistant cable according to claim 6, characterized in that: The outside of the polyurethane sheath (12) is provided with a fire-retardant coating (15), the fire-retardant coating (15) is sprayed on the outside of the polyurethane sheath (12) by a spraying process, and the thickness of the fire-retardant coating (15) is 0.8-1.2mm.

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