Flexible fireproof cable

Abstract

The flexible fireproof cable comprises a plurality of cable cores, a plurality of supporting linings and an outer sheath, the supporting linings are uniformly arranged in the outer sheath at intervals, the supporting linings are axially provided with a plurality of first through holes corresponding to the cable cores, the plurality of cable cores are respectively arranged in the first through holes in a penetrating manner, each cable core comprises a conductor, an inner wrapping layer and an inner insulating layer, and the inner wrapping layer and the inner insulating layer are arranged on the outer sheath. The inner wrapping layer wraps the outer layer of the conductor, the inner insulating layer wraps the inner wrapping layer, the gap of the cable core is filled with fire-resistant filler, the periphery of the fire-resistant filler and the periphery of the supporting lining are wrapped with the outer insulating layer, and an outer fireproof layer is arranged between the outer insulating layer and the outer sheath. According to the fireproof cable, the overall pressure resistance of the fireproof cable can be improved through the supporting lining, when the fireproof cable is radially extruded by external force, the supporting lining can firstly bear pressure to generate deformation so as to protect the internal cable core, meanwhile, the supporting lining has little influence on the flexibility of the fireproof cable, and construction and installation are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to fireproof cable technical field, concretely relates to a flexible fireproof cable. BACKGROUND

[0002] The fireproof cable is mainly suitable for high-rise buildings, subways, public places and many construction projects requiring high quality and high safety in cities, and is used in fire elevators, fire pumps, fire alarms, smoke exhaust systems, emergency lighting, fire hazard areas, high temperature environments and other occasions in the fire fighting system.

[0003] The existing fireproof cable has rigid fireproof cable and flexible fireproof cable, wherein the rigid fireproof cable is armored with a metal protective layer, and has high compression resistance and tensile strength, but has low softness, and the bending radius is generally more than 20 times of the outer diameter of the cable, which is not conducive to installation and construction; although the flexible fireproof cable has high softness, it has low compression resistance, and is prone to internal cable core rupture when subjected to heavy drop impact, thereby affecting power transmission. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to overcome the defects in the above background art, and provide a flexible fireproof cable.

[0005] To achieve the above purpose, the utility model provides a flexible fireproof cable, which comprises a plurality of cable cores, a plurality of supporting inner liners and an outer sheath, the plurality of supporting inner liners are uniformly and spacedly arranged in the outer sheath, a plurality of first through holes corresponding to the cable cores are axially formed in the supporting inner liner, and a plurality of cable cores are respectively arranged in the first through holes; the cable core comprises a conductor, an inner wrapping layer and an inner insulation layer, the inner wrapping layer is wrapped on the outer layer of the conductor, and the inner insulation layer is wrapped on the inner wrapping layer; the gap between the cable cores is filled with fireproof filling material, the outer periphery of the fireproof filling material and the supporting inner liner is wrapped with an outer insulation layer, and an outer fireproof layer is arranged between the outer insulation layer and the outer sheath. By arranging the supporting inner liner, the overall compression resistance of the fireproof cable can be effectively improved, when the fireproof cable is subjected to radial extrusion by external force, the supporting inner liner can first bear the pressure and deform to protect the internal cable core, so that the cable core is prevented from deforming or rupturing, thereby protecting the internal cable core from damage and ensuring the safe and stable operation of the line, so that the flexible fireproof cable can improve the compression resistance while reducing the influence on the softness, and is convenient for construction and installation.

[0006] Further optimize the technical scheme, the conductor is twisted by any one of pure copper wire, silver-plated copper wire and nickel-plated copper wire. By twisting a plurality of copper wire filaments together, the conductivity of the conductor is improved while the flexibility is improved.

[0007] Further optimize the technical scheme, the inner wrapping layer is wrapped with any one or more of polytetrafluoroethylene tape, alkali-free glass fiber tape, polytetrafluoroethylene tape and mica tape. The conductor is fixed by the inner wrapping layer to avoid looseness.

[0008] Further optimize the technical scheme, the inner insulation layer is made of glass fiber insulation material. The insulation effect between the cable cores is increased by the inner insulation layer to avoid short circuit between the cable cores.

[0009] Further optimize the technical scheme, the outer sheath is extruded from halogen-free low-smoke flame-retardant polyolefin sheath material. By using halogen-free low-smoke flame-retardant polyolefin sheath material as the outermost protective layer of the cable, the wear resistance, flame retardance and high temperature resistance of the cable are improved, and no toxic gas is generated in case of fire.

[0010] Further optimize the technical scheme, the support lining is made of any one of metal, polytetrafluoroethylene, polyimide and polystyrene sulfide, wherein the polytetrafluoroethylene, polyimide and polystyrene sulfide are all modified and hardened. By using hard metal material or modified and hardened polytetrafluoroethylene, polyimide and polystyrene sulfide as the support lining material, the compression resistance is improved.

[0011] Further optimize the technical scheme, the fire-resistant filler is a rope-shaped material woven by phenolic fiber and aramid fiber. The fire-resistant filler improves the fire resistance of the cable while increasing the mechanical strength of the fire-resistant cable.

[0012] Further optimize the technical scheme, a plurality of second through holes are axially formed in the support lining, and the rope-shaped material passes through the second through holes to string the support linings together. By stringing the support linings together, the tensile strength of the cable is further improved.

[0013] Further optimize the technical scheme, the outer insulation layer is wrapped with a three-in-one mica tape wrapped with mica between two layers of glass cloth. By wrapping with the three-in-one mica tape, the cable has good fire resistance and insulation performance.

[0014] Further optimize the technical scheme, the outer fireproof layer is extruded from ceramicized silicone rubber. By using ceramicized silicone rubber, the bending performance of the cable is ensured while the fireproof performance is further improved.

[0015] The utility model discloses a beneficial effect includes: through the support lining can effectively improve the overall compressive strength of fireproof cable, when the fireproof cable is extruded by external force radially, the support lining can first bear the pressure and produce deformation, to protect the inside cable core, avoid cable core deformation or rupture, ensure the safe and stable operation of line, and because the support lining is not full of whole cable, but interval arrangement, the influence to the softness of fireproof cable is less, make the flexible fireproof cable of the utility model reduce the influence to the softness while improving the compression performance, convenient installation construction. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the structure schematic diagram of flexible fireproof cable in the utility model embodiment.

[0017] Fig. 2 It is the cutout schematic diagram of the support lining of flexible fireproof cable in the utility model embodiment.

[0018] Fig. 3 It is the schematic diagram of support lining in the utility model embodiment.

[0019] Signs: 1 cable core;101 conductor;102 inner wrapping layer;103 inner insulation layer;2 support lining;201 first through hole;202 second through hole;3 outer sheath;4 fire -resistant filler;5 outer insulation layer;6 outer fire -proof layer. DETAILED DESCRIPTION

[0020] In order to make the technical problem, technical scheme and beneficial effect that the utility model embodiment wants to solve more clearly, the following is combined with the drawing and embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0021] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for fixing or for circuit communication.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model embodiments and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0023] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0024] Please refer to Figs. 1 to 3 The flexible fireproof cable disclosed in the embodiment comprises a plurality of cable cores 1, a plurality of support inner liners 2 and an outer sheath 3. The plurality of support inner liners 2 are evenly spaced in the outer sheath 3 along the length direction of the cable. A plurality of first through holes corresponding to the cable cores 1 are axially formed on the support inner liner 2. The plurality of cable cores 1 are respectively arranged in the first through holes 201 and bundled together to reduce the external size of the cable. The cable core 1 comprises a conductor 101, an inner wrapping layer 102 and an inner insulation layer 103. The inner wrapping layer 102 wraps the outer layer of the conductor 101 to fix the conductors 101 of each cable core 1 together. The inner insulation layer 103 is wrapped on the inner wrapping layer 102 to prevent current leakage between the cable cores 1 and ensure effective transmission of electric energy or signals. A fireproof filler 4 is filled in the gap between the cable cores 1. The fireproof filler 4 plays a role of fireproofing, heat insulation, support and protection of the cable. An outer insulation layer 5 is wrapped around the fireproof filler 4 and the support inner liner 2. The outer insulation layer 5 can prevent current leakage of the whole cable to the outside, causing the risk of short circuit and electric shock. An outer fireproof layer 6 is arranged between the outer insulation layer 5 and the outer sheath 3. The outer fireproof layer 6 is used to further improve the fireproof performance, prolong the service life, protect the insulation layer and improve the safety. In the embodiment, the overall pressure resistance of the fireproof cable can be effectively improved by the support inner liner 2. When the fireproof cable is radially extruded by external force, the support inner liner 2 can first bear the pressure and deform to protect the internal cable core 1, avoid deformation or rupture of the cable core 1, thereby protecting the internal cable core 1 from damage and ensuring the safe and stable operation of the line. Since the support inner liner 2 is not distributed throughout the whole cable to form a metal armor layer similar to the traditional cable, the softness of the fireproof cable is less affected, so that the flexible fireproof cable of the present application reduces the influence on the softness while improving the pressure resistance, facilitating construction and installation.

[0025] In a specific example, the conductor 101 is twisted by any one of pure copper wire, silver-plated copper wire and nickel-plated copper wire. The conductor 101 is twisted together by a plurality of copper wire filaments in a non-twisted manner. On the one hand, the conductor 101 can increase the conductive area, thereby improving the conductivity of the conductor 101. On the other hand, the flexibility can be improved.

[0026] In a specific example, the inner wrapping layer 102 is wrapped with any one or more of a polytetrafluoroethylene tape, an alkali-free glass fiber tape, a polytetrafluoroethylene tape, and a mica tape. By wrapping the inner wrapping layer 102 with any one or more of a polytetrafluoroethylene tape, an alkali-free glass fiber tape, a polytetrafluoroethylene tape, and a mica tape, the copper wire stranded conductor 101 can be fixed together after being stranded by a plurality of monofilaments, avoiding loosening, improving the stability of the cable core 1 structure, and simultaneously enhancing the insulation performance and improving the mechanical strength.

[0027] In a specific example, the inner insulation layer 103 is made of a glass fiber insulation material. The inner insulation layer 103 further increases the insulation effect between the cable cores 1, avoiding short circuits between the cable cores 1.

[0028] In a specific example, the outer sheath 3 is extruded from a halogen-free low-smoke flame-retardant polyolefin sheath material. After being modified by halogen-free low-smoke flame-retardant treatment, the polyolefin, as the outermost protective layer of the cable, has better wear resistance, flame retardance, high temperature resistance, and the like, and does not produce toxic gases in the event of a fire.

[0029] In a specific example, the support lining 2 is made of any one of a metal, polytetrafluoroethylene, polyimide, and polystyrene sulfide, wherein the polytetrafluoroethylene, polyimide, and polystyrene sulfide are all modified and hardened, and the metal material includes any one of a steel wire, a steel belt, an aluminum belt, a copper belt, a copper wire, an aluminum alloy belt, and a lead alloy belt, and preferably an aluminum alloy belt. By hardening and modifying the polytetrafluoroethylene, polyimide, or polystyrene sulfide, the support lining 2 is used to improve the compression resistance of the support lining 2.

[0030] In a specific example, the fire-resistant filler 4 is a rope-like material formed by crossing and weaving phenolic fibers and aramid fibers. The rope-like material formed by crossing and weaving the phenolic fibers and aramid fibers is tightly filled in the gaps between the cable cores 1, which can increase the mechanical strength of the fire-resistant cable, maintain stable electrical performance and physical structure in a high-temperature environment, and ensure the safety and reliability of the cable.

[0031] In a preferred embodiment, a plurality of second through holes 202 are axially formed on the support lining 2, and the rope-like material passes through the second through holes 202 to string the support linings 2 together. By stringing the support linings 2 together, the tensile performance of the cable is further improved.

[0032] In a specific example, the outer insulation layer 5 is wrapped with a three-in-one mica tape made by attaching a mica 502 between two layers of glass cloth 501. By wrapping with the three-in-one mica tape, the cable has good fireproof performance, and also has excellent electrical performance.

[0033] In a specific example, the outer fireproof layer 6 is extruded from ceramicized silicone rubber. The ceramicized silicone rubber has the properties of rubber at low temperatures, with good elasticity, ensuring the bending performance of the cable, while under high-temperature flame conditions, the ceramic can quickly sinter into a hard "ceramicized" shell, well fixing the insulated core, increasing the insulation stability at high temperatures, controlling the conductor temperature, protecting the cable from damage, and keeping the power transmission smooth.

[0034] The above is a further detailed description of the utility model in combination with specific / preferred embodiments, and cannot be deemed as limiting the specific implementation of the utility model to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, they can make several substitutions or modifications to the described embodiments without departing from the concept of the utility model, and these substitutions or modifications shall be deemed as falling within the protection scope of the utility model. In the description of the present specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In the case of no mutual contradiction, the skilled person in the art can combine and combine the different embodiments or examples described in the present specification and the features of different embodiments or examples. Although the embodiments of the utility model and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the protection scope of the patent application.

Claims

1. A flexible fire resistant cable, characterized by: The cable comprises a plurality of cable cores, a plurality of support inner linings and an outer sheath, the plurality of support inner linings are uniformly spaced in the outer sheath, a plurality of first through holes corresponding to the cable cores are axially formed on the support inner linings, and a plurality of cable cores are respectively arranged in the first through holes.

2. The flexible fire resistant cable of claim 1, wherein: The conductor is twisted by any one of pure copper wire, silver-plated copper wire and nickel-plated copper wire.

3. The flexible fire resistant cable of claim 1, wherein: The inner wrapping layer is wrapped by any one or more than one of polytetrafluoroethylene tape, alkali-free glass fiber tape, polytetrafluoroethylene tape and mica tape.

4. The flexible fire resistant cable of claim 1, wherein: The inner insulation layer is made of glass fiber insulation material.

5. The flexible fire-resistant cable as described in claim 1, characterized in that: The outer sheath is extruded by halogen-free low-smoke flame-retardant polyolefin sheath material.

6. The flexible fire resistant cable of claim 1, wherein: The support inner lining is made of any one of metal, polytetrafluoroethylene, polyimide and polystyrene sulfide, wherein the polytetrafluoroethylene, polyimide and polystyrene sulfide are all subjected to modified hardening treatment.

7. The flexible fire resistant cable of claim 1, wherein: The fire-resistant filling material is a rope-shaped material formed by crossing and weaving phenolic fiber and aramid fiber.

8. A flexible fire resistant cable according to claim 7, wherein: A plurality of second through holes are axially formed on the support inner lining, and the rope-shaped material passes through the second through holes to string the support inner linings together.

9. The flexible fire resistant cable of claim 1, wherein: The outer insulation layer is wrapped by three-in-one mica tape wrapped by mica attached between two layers of glass cloth.

10. The flexible fire resistant cable of claim 1, wherein: The outer fireproof layer is extruded by ceramicized silicone rubber.

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