Fireproof cable

Abstract

The invention relates to the technical field of cables, and provides a fireproof cable which comprises an inner protection layer, a porous medium layer, an armor layer, a heat conduction layer and an outer protection layer, a support, a core wire and an air bag are arranged in the inner protection layer, the core wire and the air bag are located between the support and the inner protection layer, the porous medium layer is arranged outside the inner protection layer, the armor layer is arranged outside the porous medium layer, and the heat conduction layer is arranged outside the outer protection layer. The heat conduction layer is arranged between the armor layer and the porous medium layer, the inner protection layer is provided with a plurality of first cavities, the porous medium layer is provided with a plurality of second cavities, first heat transfer rods, springs and second heat transfer rods are arranged in the first cavities, the springs are located between the first heat transfer rods and the second heat transfer rods, and the ends, away from the springs, of the first heat transfer rods make contact with the heat conduction layer. The end, away from the spring, of the second heat transfer rod contacts with the airbag. Through mutual cooperation of the heat conduction layer, the first heat transfer rod, the spring and the second heat transfer rod, the fireproof performance of the cable is improved, meanwhile, heat generated in the cable can be dissipated, and the safety of the cable is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a fireproof cable. Background Art

[0002] A cable is a device used for transmitting electrical energy or signals. A cable generally includes a conductive cable core and an insulating layer covering the outside of the cable core.

[0003] When a fire occurs in a place where cables are installed, the fire often spreads to various places along the cables. In order to reduce the occurrence of the above problems, existing fire-resistant cables generally add flame retardants to the insulation layer materials of the cables. However, the flame retardant effect of the insulation layer with flame retardants is limited. When the fire source exists for a long time, the fire may still spread. In addition, the cable itself may also have breakdown and other faults during operation, causing fires. It cannot effectively retard and isolate fire. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a fireproof cable to improve the fireproof performance of the cable.

[0005] The embodiment of the present invention provides a fireproof cable, which adopts the following technical solutions:

[0006] A fireproof cable comprises an inner protective layer, a porous medium layer, an armor layer, a heat conducting layer and an outer protective layer. A support, a core wire and an air bag are arranged inside the inner protective layer. The core wire and the air bag are both located between the support and the inner protective layer. The porous medium layer is arranged outside the inner protective layer. The armor layer is arranged outside the porous medium layer. The heat conducting layer is arranged between the armor layer and the porous medium layer. The inner protective layer has a plurality of first cavities. The porous medium layer has a plurality of second cavities. The number of the first cavities is the same as the number of the second cavities and they are arranged one by one. A first heat transfer rod, a spring and a second heat transfer rod are arranged inside the first cavity. The spring is located between the first heat transfer rod and the second heat transfer rod. One end of the first heat transfer rod away from the spring passes through the second cavity. The first heat transfer rod contacts the heat conducting layer. One end of the second heat transfer rod away from the spring contacts the air bag. The outer protective layer is arranged outside the armor layer.

[0007] Preferably, the end of the second heat transfer rod close to the airbag is a spherical structure, and the end of the second heat transfer rod close to the airbag has a plurality of protrusions.

[0008] Preferably, three of the brackets and three of the core wires are provided, a reinforcing core is provided between the three brackets, and six of the airbags are provided, and the airbags are provided on both sides of the core wire.

[0009] Preferably, a refractory material layer is filled between the bracket and the inner protective layer, and the refractory material is one of alumina, aluminum silicate or magnesium silicate.

[0010] Preferably, the heat conducting layer has a plurality of bumps, and the bumps are partially embedded in the porous medium layer, and the bumps are used to block the second cavity.

[0011] Preferably, the protrusion and the porous medium layer are connected by high temperature resistant glue, and the high temperature resistant glue is one of organic silicon high temperature glue, inorganic ceramic high temperature glue, alumina high temperature glue or high temperature hot melt glue.

[0012] Preferably, the heat conducting layer, the first heat transfer rod and the second heat transfer rod are respectively made of ceramic or glass, and the porous medium layer is made of one of glass fiber, basalt fiber and porous ceramic material.

[0013] Preferably, the inner protective layer is made of an inorganic mineral material, and the inorganic mineral material is one of aluminum oxide, aluminum silicate or magnesium silicate.

[0014] Preferably, the armor layer is a copper wire mesh tape.

[0015] Preferably, the outer protective layer is made of low-smoke halogen-free flame retardant material, and the outside of the outer protective layer is coated with an anti-corrosion layer.

[0016] Beneficial effects of the present invention:

[0017] The present invention provides a bracket and an air bag. The bracket can separate the core wires to avoid mutual influence between the core wires. The air bag plays a buffering role and can increase the compression resistance of the cable.

[0018] By arranging the heat-conducting layer, the first heat-conducting rod, the spring and the second heat-conducting rod, when the fire source exists outside the cable, the heat is transferred to the first heat-conducting rod through the outer protective layer, the armor layer and the heat-conducting layer, the heat of the first heat-conducting rod is transferred to the second heat-conducting rod through the spring, and the second heat-conducting rod transfers the heat to the airbag, so that the airbag is damaged, and the nitrogen in the airbag enters the second cavity through the first cavity, and then the nitrogen in the second cavity enters the interior of the porous medium layer and forms a flame-retardant layer, so that the cable is not easy to catch fire. When the fire source exists inside the cable, the flame will destroy the airbag, and the airbag releases nitrogen to play a fire-proof role, thereby effectively increasing the fire-proof performance of the cable, prolonging the fire time of the cable, and buying rescue time for rescue personnel.

[0019] When the cable is working, the core wire will generate heat due to the action of the current. The heat can be transferred to the heat conductive layer through the second heat transfer rod, the spring and the first heat transfer rod, and dissipated through the outer protective layer, thereby improving the safety of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of some embodiments of the present invention;

[0022] Figure 2 for Figure 1 A magnified view of the structure at center;

[0023] Figure 3 Schematic diagram of the structure of the second heat transfer rod in some embodiments of the present invention.

[0024] The reference numerals are:

[0025] 1. Inner protective layer; 2. Porous medium layer; 3. Armor layer; 4. Heat conductive layer; 5. Outer protective layer; 6. Bracket; 7. Core wire; 8. Airbag; 9. First cavity; 10. Second cavity; 11. First heat transfer rod; 12. Spring; 13. Second heat transfer rod; 14. Bump; 15. Reinforcement core; 16. Refractory material layer; 17. Bump. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Example

[0033] like Figure 1-3As shown, a fireproof cable according to an embodiment of the present invention comprises an inner protective layer 1, a porous medium layer 2, an armor layer 3, a heat conductive layer 4 and an outer protective layer 5. A bracket 6, a core wire 7 and an air bag 8 are arranged inside the inner protective layer 1. The core wire 7 and the air bag 8 are both located between the bracket 6 and the inner protective layer 1. The bracket 6 can separate the core wire 7 to avoid mutual influence between the core wires 7. The air bag 8 plays a buffering role and can increase the compression resistance of the cable. The porous medium layer 2 is arranged outside the inner protective layer 1, and the armor layer 3 is arranged outside the porous medium layer 2. The heat conducting layer 4 is arranged between the armor layer 3 and the porous medium layer 2, the inner protective layer 1 has a plurality of first cavities 9, the porous medium layer 2 has a plurality of second cavities 10, the number of the first cavities 9 is the same as the number of the second cavities 10 and they are arranged one by one, a first heat transfer rod 11, a spring 12 and a second heat transfer rod 13 are arranged inside the first cavity 9, the spring 12 is located between the first heat transfer rod 11 and the second heat transfer rod 13, an end of the first heat transfer rod 11 away from the spring 12 passes through the second cavity 10, and the first heat transfer rod 11 is connected to the heat conducting layer 4. The end of the second heat transfer rod 13 away from the spring 12 contacts the airbag 8. The outer protective layer 5 is arranged outside the armor layer 3. When the fire source exists outside the cable, the heat is transferred to the first heat transfer rod 11 through the outer protective layer 5, the armor layer 3 and the heat conductive layer 4. The heat of the first heat transfer rod 11 is transferred to the second heat transfer rod 13 through the spring 12. The second heat transfer rod 13 transfers the heat to the airbag 8, causing the airbag 8 to break. The nitrogen in the airbag 8 enters the second cavity 10 through the first cavity 9, and then the nitrogen in the second cavity 10 enters the porous medium layer 14. 2 and form a flame retardant layer to prevent the cable from catching fire. When a fire source exists inside the cable, the flame will destroy the airbag 8, and the airbag 8 will release nitrogen to prevent fire, thereby effectively increasing the fire resistance of the cable and extending the fire ignition time of the cable, thus buying rescue time for rescue personnel. When the cable is working, the core wire 7 will generate heat due to the effect of the current. The heat can be transferred to the heat conductive layer 4 through the second heat transfer rod 13, the spring 12, and the first heat transfer rod 11, and dissipated through the outer protective layer 5, thereby improving the safety of the cable.

[0034] In this embodiment, the end of the second heat transfer rod 13 close to the airbag 8 is a spherical structure, and the end of the second heat transfer rod 13 close to the airbag 8 has multiple protrusions 14. When the temperature of the protrusions 14 rises to a certain value, the airbag 8 is quickly destroyed.

[0035] In this embodiment, three brackets 6 and three core wires 7 are provided to isolate the three core wires 7 to avoid mutual influence among the three core wires 7. A reinforcing core 15 is provided between the three brackets 6 to increase the overall strength and flexibility of the cable. Six airbags 8 are provided, and airbags 8 are provided on both sides of the core wire 7 to increase the compression resistance of the cable.

[0036] In this embodiment, a refractory material layer 16 is filled between the bracket 6 and the inner protective layer 1. The refractory material is one of alumina, aluminum silicate or magnesium silicate, which can withstand high temperatures without melting or deforming significantly, thereby improving the fire resistance of the cable.

[0037] In this embodiment, the heat conducting layer 4 has a plurality of bumps 17 , and the bumps 17 are partially embedded in the porous medium layer 2 . The bumps 17 are used to block the second cavity 10 , slow down the leakage rate of nitrogen, and improve the fireproof performance of the cable.

[0038] In this embodiment, the bump 17 and the porous medium layer 2 are connected by high-temperature resistant glue, which can still maintain the bonding strength required by the design under high temperature conditions, thereby improving the stability of the connection between the bump 17 and the porous medium layer 2. The high-temperature resistant glue is one of organic silicone high-temperature glue, inorganic ceramic high-temperature glue, alumina high-temperature glue or high-temperature hot melt glue.

[0039] In this embodiment, the heat conducting layer 4, the first heat transfer rod 11, and the second heat transfer rod 13 are respectively made of ceramic or glass, and have the characteristics of high temperature resistance, thermal conductivity, and good insulation performance. The porous medium layer 2 is made of one of glass fiber, basalt fiber, and porous ceramic material, and has the characteristics of high temperature resistance and good thermal conductivity.

[0040] In this embodiment, the inner protective layer 1 is made of an inorganic mineral material, and the inorganic mineral material is one of aluminum oxide, aluminum silicate or magnesium silicate, and has high temperature resistance.

[0041] In this embodiment, the armor layer 3 is a copper wire mesh belt, which can protect the current or signal from external electromagnetic interference, avoid the electromagnetic field generated by itself during use from interfering with the surrounding environment and current flow failure, and facilitate rapid heat transfer to the first heat transfer rod 11.

[0042] In this embodiment, the outer protective layer 5 is made of low-smoke halogen-free flame retardant material. When burned, it does not release halogen-containing gas and the smoke concentration is low. The outside of the outer protective layer 5 is coated with anti-corrosion material, which is used to improve the anti-corrosion performance of the cable.

[0043] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fireproof cable, characterized in that: The invention comprises an inner protective layer, a porous medium layer, an armor layer, a heat conducting layer and an outer protective layer. A support, a core wire and an air bag are arranged inside the inner protective layer. The core wire and the air bag are both located between the support and the inner protective layer. The porous medium layer is arranged outside the inner protective layer. The armor layer is arranged outside the porous medium layer. The heat conducting layer is arranged between the armor layer and the porous medium layer. The inner protective layer has a plurality of first cavities. The porous medium layer has a plurality of second cavities. The number of the first cavities is the same as the number of the second cavities and they are arranged one by one. A first heat transfer rod, a spring and a second heat transfer rod are arranged inside the first cavity. The spring is located between the first heat transfer rod and the second heat transfer rod. One end of the first heat transfer rod away from the spring passes through the second cavity. The first heat transfer rod contacts the heat conducting layer. One end of the second heat transfer rod away from the spring contacts the air bag. The outer protective layer is arranged outside the armor layer.

2. A fireproof cable according to claim 1, characterized in that: One end of the second heat transfer rod close to the airbag is a spherical structure, and one end of the second heat transfer rod close to the airbag has a plurality of convex points.

3. A fireproof cable according to claim 1, characterized in that: The number of the brackets and the number of the core wires are three, a reinforcing core is arranged between the three brackets, and the number of the airbags is six, and the airbags are arranged on both sides of the core wire.

4. A fireproof cable according to claim 3, characterized in that: A refractory material layer is filled between the bracket and the inner protective layer, and the refractory material is one of aluminum oxide, aluminum silicate or magnesium silicate.

5. A fireproof cable according to claim 1, characterized in that: The heat-conducting layer has a plurality of bumps, and the bumps are partially embedded in the porous medium layer. The bumps are used to block the second cavity.

6. A fireproof cable according to claim 5, characterized in that: The convex block and the porous medium layer are connected by high temperature resistant adhesive, and the high temperature resistant adhesive is one of organic silicon high temperature adhesive, inorganic ceramic high temperature adhesive, alumina high temperature adhesive or high temperature hot melt adhesive.

7. A fireproof cable according to claim 6, characterized in that: The heat conducting layer, the first heat transfer rod and the second heat transfer rod are respectively made of ceramic or glass, and the porous medium layer is made of one of glass fiber, basalt fiber and porous ceramic material.

8. A fireproof cable according to claim 1, characterized in that: The inner protective layer is made of an inorganic mineral material, and the inorganic mineral material is one of aluminum oxide, aluminum silicate or magnesium silicate.

9. A fireproof cable according to claim 1, characterized in that: The armor layer is a copper wire mesh tape.

10. A fireproof cable according to claim 1, characterized in that: The outer protective layer is made of low-smoke halogen-free flame retardant material, and the outside of the outer protective layer is coated with an anti-corrosion layer.

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