A fire resistant cable

Abstract

The present application relates to cable technical field, provide a kind of fireproof cable, including inner protective layer, porous medium layer, armoring layer, heat conducting layer and outer protective layer, inner protective layer inside is equipped with support, core wire and air bag, core wire, air bag are located between support and inner protective layer, porous medium layer is equipped in inner protective layer outside, armoring layer is equipped in porous medium layer outside, heat conducting layer is equipped between armoring layer and porous medium layer, inner protective layer has multiple first cavities, porous medium layer has multiple second cavities, first cavity inside is equipped with first heat transfer rod, spring and second heat transfer rod, spring is located between first heat transfer rod and second heat transfer rod, first heat transfer rod far from spring one end and heat conducting layer contact, second heat transfer rod far from spring one end and air bag contact.The present application utilizes the cooperation between heat conducting layer, first heat transfer rod, spring and second heat transfer rod, improves the fireproof performance of cable, simultaneously can dissipate the heat generated inside cable, improves the safety of cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a fireproof cable. BACKGROUND

[0002] The cable is a device for power or signal transmission, which generally comprises a cable core and an insulating layer covering the cable core.

[0003] When a fire occurs in a place where the cable is installed, the fire tends to spread along the cable to everywhere. In order to reduce the occurrence of the above problems, the existing fireproof cable generally adds a flame retardant to the insulating layer material of the cable. However, the flame-retardant effect of the insulating layer with the flame retardant is limited. When the fire source exists for a long time, the fire may still spread, and the cable itself may also have a breakdown failure and cause a fire during operation, which cannot effectively prevent and extinguish the fire. SUMMARY

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

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

[0006] The fireproof cable comprises an inner protective layer, a porous medium layer, an armored layer, a heat-conducting layer and an outer protective layer. The inner protective layer is internally provided with a support, a core wire and an air bag. The core wire and the air bag are located between the support and the inner protective layer. The porous medium layer is arranged outside the inner protective layer. The armored layer is arranged outside the porous medium layer. The heat-conducting layer is arranged between the armored 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 that of the second cavities and is arranged in one-to-one correspondence. The first cavities are internally provided with a first heat-conducting rod, a spring and a second heat-conducting rod. The spring is located between the first heat-conducting rod and the second heat-conducting rod. One end of the first heat-conducting rod away from the spring penetrates through the second cavity. The first heat-conducting rod is in contact with the heat-conducting layer. One end of the second heat-conducting rod away from the spring is in contact with the air bag. The outer protective layer is arranged outside the armored layer.

[0007] Preferably, one end of the second heat-conducting rod close to the air bag is in a spherical structure. The one end of the second heat-conducting rod close to the air bag has a plurality of convex points.

[0008] Preferably, the support and the core wire are each provided with three. A reinforcing core is arranged between the three supports. The air bag is provided with six. The two sides of the core wire are each provided with the air bag.

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

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

[0011] Preferably, a high-temperature-resistant adhesive is used to connect the protrusions and the porous medium layer, and the high-temperature-resistant adhesive is one of organic silicon high-temperature-resistant adhesive, inorganic ceramic high-temperature-resistant adhesive, alumina high-temperature-resistant adhesive or high-temperature hot melt adhesive.

[0012] Preferably, the heat-conducting layer, the first heat-conducting rod and the second heat-conducting 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 inorganic mineral material, and the inorganic mineral material is one of alumina, aluminum silicate or magnesium silicate.

[0014] Preferably, the armored layer is a copper wire mesh belt.

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

[0016] The present application has the following beneficial effects:

[0017] The support can separate the core wires to avoid mutual influence between the core wires, and the air bag can increase the pressure resistance of the cable.

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

[0019] When the cable works, heat is generated by the core wires due to the action of current, the heat is transferred to the heat-conducting layer through the second heat-conducting rod, the spring and the first heat-conducting rod, and is dissipated through the outer protective layer, thereby improving the safety of the cable in use. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0021] Figure 1 Structure schematic diagram of some embodiments of the present application;

[0022] Figure 2 Structure schematic diagram of some embodiments of the present application; Figure 1 Structure enlarged diagram of A in the middle;

[0023] Figure 3 Structure schematic diagram of the second heat transfer rod in some embodiments of the present application.

[0024] The reference signs are respectively:

[0025] 1, inner protective layer; 2, porous medium layer; 3, armored layer; 4, heat conduction layer; 5, outer protective layer; 6, support; 7, core wire; 8, air bag; 9, first cavity; 10, second cavity; 11, first heat transfer rod; 12, spring; 13, second heat transfer rod; 14, protruding point; 15, reinforcing core; 16, refractory material layer; 17, protruding block. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not 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 drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0028] It should be noted that: similar reference signs and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the 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" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" and the like 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 must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Embodiments

[0033] As Figures 1-3As shown, the fireproof cable provided by the embodiment of the present application comprises an inner protective layer 1, a porous medium layer 2, an armored layer 3, a heat conducting layer 4 and an outer protective layer 5, the inner protective layer 1 is internally provided with a support 6, core wires 7 and an air bag 8, the core wires 7 and the air bag 8 are both located between the support 6 and the inner protective layer 1, the support 6 can separate the core wires 7 to avoid mutual influence between the core wires 7, the air bag 8 can increase the pressure resistance of the cable, the porous medium layer 2 is arranged outside the inner protective layer 1, the armored layer 3 is arranged outside the porous medium layer 2, the heat conducting layer 4 is arranged between the armored 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 that of the second cavities 10 and they are arranged one by one, the first cavities 9 are internally provided with a first heat transfer rod 11, a spring 12 and a second heat transfer rod 13, the spring 12 is located between the first heat transfer rod 11 and the second heat transfer rod 13, one end of the first heat transfer rod 11 away from the spring 12 penetrates through the second cavity 10, the first heat transfer rod 11 is in contact with the heat conducting layer 4, one end of the second heat transfer rod 13 away from the spring 12 is in contact with the air bag 8, the outer protective layer 5 is arranged outside the armored layer 3, when a fire source exists outside the cable, heat is transferred to the first heat transfer rod 11 through the outer protective layer 5, the armored layer 3 and the heat conducting 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 air bag 8, so that the air bag 8 is damaged, the nitrogen in the air bag 8 enters the second cavity 10 through the first cavity 9, then the nitrogen in the second cavity 10 enters the inside of the porous medium layer 2 and forms a fire-retardant layer, so that the cable is not easy to catch fire, when a fire source exists inside the cable, the flame will damage the air bag 8, the air bag 8 releases nitrogen to play a fireproof role, thereby effectively increasing the fireproof performance of the cable, prolonging the fire time of the cable and gaining rescue time for rescue personnel, when the cable is working, the core wires 7 will generate heat due to the action of current, the heat can be transferred to the heat conducting layer 4 through the second heat transfer rod 13, the spring 12 and the first heat transfer rod 11, and then dissipated through the outer protective layer 5, thereby improving the safety of the cable in use.

[0034] In the embodiment, one end of the second heat transfer rod 13 close to the air bag 8 is in a spherical structure, the one end of the second heat transfer rod 13 close to the air bag 8 has a plurality of convex points 14, after the temperature of the convex points 14 rises to a certain value, the air bag 8 can be quickly damaged.

[0035] In the embodiment, the support 6 and the core wires 7 are both provided with three, three core wires 7 are isolated to avoid mutual influence between the three core wires 7, a reinforcing core 15 is arranged between the three supports 6, the reinforcing core 15 is used to increase the overall strength and flexibility of the cable, the air bag 8 is provided with six, the two sides of the core wires 7 are both provided with the air bag 8 to increase the pressure resistance of the cable.

[0036] In the embodiment, the fireproof material layer 16 is filled between the support 6 and the inner protective layer 1, the fireproof material is one of alumina, aluminum silicate or magnesium silicate, and can withstand high temperature without melting or significant deformation, thereby improving the fireproof performance of the cable.

[0037] In the embodiment, the heat conduction layer 4 has a plurality of protrusions 17, the protrusions 17 are partially embedded into the inner part of the porous medium layer 2, the protrusions 17 are used to block the second cavities 10, delay the leakage speed of nitrogen, and improve the fireproof performance of the cable.

[0038] In the embodiment, the high-temperature-resistant glue is used between the protrusions 17 and the porous medium layer 2, the high-temperature-resistant glue can still maintain the required glue strength under high temperature conditions, thereby improving the stability of the connection between the protrusions 17 and the porous medium layer 2, and the high-temperature-resistant glue is one of organic silicon high-temperature-resistant glue, inorganic ceramic high-temperature-resistant glue, alumina high-temperature-resistant glue or high-temperature hot melt glue.

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

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

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

[0042] In the embodiment, the outer protective layer 5 is made of low-smoke and halogen-free flame-retardant material, does not release halogen-containing gas under burning conditions, has low smoke concentration, and the outer part of the outer protective layer 5 is coated with anticorrosive material for improving the corrosion resistance of the cable.

[0043] The above is only a preferred embodiment of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. 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 by: The invention comprises an inner protective layer, a porous medium layer, an armor layer, a heat-conducting layer and an outer protective layer. A bracket, a core wire and an airbag are arranged inside the inner protective layer. The core wire and the airbag are both located between the bracket 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, and 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, and 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 is arranged in a one-to-one correspondence. 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. The end of the first heat transfer rod away from the spring passes through the second cavity. The first heat transfer rod is in contact with the heat-conducting layer, and the end of the second heat transfer rod away from the spring is in contact with the airbag. The outer protective layer is arranged outside the armor layer.

2. A fireproof cable according to claim 1, characterized in that: 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.

3. A fireproof cable according to claim 1, characterized in that: There are three brackets and three core wires, and a reinforcing core is provided between the three brackets. There are six airbags, and the airbags are provided 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 interior of 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 bumps 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.

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

10. The 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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