Fireproof cable with step-down temperature structure

Abstract

The application discloses a fireproof cable with a stepped temperature reduction structure and belongs to the technical field of cables. The fireproof cable comprises a protective layer, a plurality of cable cores are wrapped in the protective layer, an inner filling cavity is arranged between the protective layer and the cable cores, the inner filling cavity is filled with inner flame-retardant filling, the cable core comprises a lead core, the lead core is wrapped with insulating rubber on the outside, and the lead core is further wrapped with a high-temperature-resistant rubber layer on the outside. The lead core is protected through the cooperation of the flame-retardant insulating sleeve, the outer flame-retardant filling, the shielding layer, the inner flame-retardant filling and the steel wire. The flame is blocked layer by layer through the above manner, the flame retardance of the fireproof cable is greatly increased, the reliability of the cable is improved, and the cable can still perform power transmission when being burned by open fire.

Description

TECHNICAL FIELD

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

[0002] The fireproof cable has special fireproof performance, which does not burn itself, does not spread and expand the fire, and can normally transmit power in a certain time to win enough time for rescuing people's life and property. The traditional fireproof cable structure is magnesium oxide mineral powder insulation copper pipe sheath, which can play a fireproof role, but the fireproof way of the fireproof cable with magnesium oxide mineral powder insulation copper pipe sheath is single, and when the magnesium oxide mineral insulation copper pipe sheath is burned through, there is no other fireproof structure to block the flame. Therefore, the present application provides a fireproof cable with gradient cooling structure to solve the above problems. SUMMARY

[0003] The present application relates to the technical field of cable, in particular to a fireproof cable with gradient cooling structure.

[0004] To achieve the above object, the present application provides the following technical scheme:

[0005] A fireproof cable with gradient cooling structure, comprising a protective layer, a plurality of cable cores are wrapped inside the protective layer, an inner filling cavity is arranged between the protective layer and the cable core, an inner flame-retardant filler is filled in the inner filling cavity, the cable core comprises a core, the core is wrapped with insulating rubber outside, and a high-temperature resistant rubber layer is further wrapped outside the core.

[0006] The outer part of the protective layer is wrapped with a shielding layer, the outer part of the shielding layer is further wrapped with a flame-retardant insulation sleeve, an outer filling cavity is arranged between the flame-retardant insulation sleeve and the shielding layer, and an outer flame-retardant filler is filled in the outer filling cavity.

[0007] As a further scheme of the present application, the protective layer is an insulating wax tube, and the insulating wax tube is made of high-temperature resistant glass fiber material. The insulating wax tube has the characteristics of high-temperature resistance, high toughness, corrosion resistance and impact resistance.

[0008] As a further scheme of the present application, the inner flame-retardant filler is aluminum hydroxide, and specifically, the aluminum hydroxide can decompose at a certain temperature.

[0009] As a further scheme of the present application, the outer part of the plurality of cores is further wrapped with a plurality of steel wires, and the tensile strength of the present application can be greatly improved by the plurality of steel wires.

[0010] As a further further scheme of the present application, the high-temperature-resistant rubber layer is wrapped with an anti-corrosion layer, which can prevent the inner fire-retardant filler from corroding the high-temperature-resistant rubber layer.

[0011] As a further further scheme of the present application, the outer wall of the shielding layer is fixedly connected with a plurality of external support strips, which can prevent the fire-retardant insulation sleeve from directly contacting the shielding layer, and can also increase the compression resistance of the present application.

[0012] As a further further scheme of the present application, the internal wall of the external support strip is provided with a ventilation channel, and the outer wall of the external support strip is also provided with a plurality of connecting holes, and the connecting holes are provided with elastic rubber membranes.

[0013] As a further further scheme of the present application, the external fire-retardant filler is calcium bicarbonate, which has the characteristic of decomposing under heat. When the calcium bicarbonate decomposes, water and calcium carbonate are generated. The calcium carbonate also decomposes under heat, and the calcium carbonate decomposes into carbon dioxide and calcium oxide under heat.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] When the present application is burned by an open flame, the fire-retardant insulation sleeve first plays a fire-retardant role, and the external fire-retardant filler decomposes under heat to generate water and calcium carbonate. The water can cool the fire-retardant insulation sleeve, and the calcium carbonate continues to decompose into carbon dioxide and calcium oxide under heat. When the fire-retardant insulation sleeve is burned through, the carbon dioxide is released to reduce the intensity of the open flame, and the calcium oxide has good heat insulation and fire-retardant effects. When the shielding layer is burned through by the open flame, the inner fire-retardant filler in the protective layer begins to decompose under heat. The inner fire-retardant filler generates water crystals and absorbs heat when it decomposes under heat, and the water crystals evaporate and absorb heat under heat. In this way, the damage of the flame to the cable core can be minimized. Finally, the core is protected by the external steel wire. The present application can block the flame layer by layer in the above manner, thereby greatly increasing the safety and fire resistance of the present application, and thereby increasing the reliability of the cable to ensure that the cable can still transmit power when it is burned by an open flame. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structural schematic diagram of a fireproof cable with a stepped cooling structure.

[0017] Fig. 2 It is a sectional view of a fireproof cable with a stepped cooling structure.

[0018] Fig. 3 It is a whole view of a fireproof cable with a stepped cooling structure.

[0019] In the figure: 1, protective layer; 2, cable core; 3, inner filling cavity; 4, shielding layer; 5, external support strip; 6, ventilation channel; 7, connecting hole; 8, outer filling cavity; 9, flame-retardant insulation sleeve; 10, inner flame-retardant filler; 11, outer flame-retardant filler; 200, lead core; 201, steel wire; 202, high-temperature-resistant rubber layer; 203, anti-corrosion layer. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0021] Please refer to Figs. 1-3 In the embodiments of the present application, a fireproof cable with a stepped cooling structure comprises a protective layer 1, the protective layer 1 is an insulating yellow wax pipe, and the insulating yellow wax pipe is made of high-temperature-resistant glass fiber material. The insulating yellow wax pipe has the characteristics of high-temperature resistance, high toughness, corrosion resistance and impact resistance. The protective layer 1 is wrapped with a plurality of cable cores 2. An inner filling cavity 3 is arranged between the protective layer 1 and the cable core 2. The inner filling cavity 3 is filled with an inner flame-retardant filler 10. The inner flame-retardant filler 10 is aluminum hydroxide. The aluminum hydroxide will decompose and release crystalline water under high temperature. Specifically, the aluminum hydroxide will decompose at 200 degrees. In the process of chemical reaction, the aluminum hydroxide will also absorb heat. In this way, the temperature between the protective layer 1 and the cable core 2 can be reduced, so that the cable core 2 is not damaged by high temperature. Moreover, the water crystals generated by the heating of the aluminum hydroxide will produce water vapor. The water vapor will dilute the flammable gas, thereby further playing a flame-retardant role. At the same time, the water vapor can also inhibit the diffusion of smoke.

[0022] The cable core 2 comprises a lead core 200. The lead core 200 is wrapped with insulating rubber. A plurality of steel wires 201 are wound outside the plurality of lead cores 200. The plurality of steel wires 201 can greatly improve the tensile strength of the present application, and can also protect the lead core 200 from damage by external factors, including being bitten by mice and accidental contact with sharp objects in the external environment, which can cause the lead core 200 to be cut. The lead core 200 is also wrapped with a high-temperature-resistant rubber layer 202. The plurality of steel wires 201 are also located in the high-temperature-resistant rubber layer 202. The material of the high-temperature-resistant rubber layer 202 is high-temperature-resistant rubber. The high-temperature-resistant rubber layer 202 is wrapped with an anti-corrosion layer 203. The anti-corrosion layer 203 can prevent the inner flame-retardant filler 10 from corroding the high-temperature-resistant rubber layer 202.

[0023] The outer part of the protective layer 1 is wrapped with a shielding layer 4, a plurality of external support strips 5 are fixedly connected to the outer wall of the shielding layer 4, the outer part of the shielding layer 4 is further wrapped with a flame-retardant insulation sleeve 9, and the plurality of external support strips 5 are located in the flame-retardant insulation sleeve 9. The external support strips 5 can avoid the flame-retardant insulation sleeve 9 from directly contacting the shielding layer 4, and can also increase the compression resistance of the present application. The internal part of the external support strips 5 is provided with a ventilation channel 6, and a plurality of connecting holes 7 are formed in the outer wall of the external support strips 5. The internal part of the connecting holes 7 is provided with an elastic rubber film.

[0024] The flame-retardant insulation sleeve 9 and the shielding layer 4 are provided with an outer filling cavity 8, and the outer filling cavity 8 is filled with an outer flame-retardant filler 11. The outer flame-retardant filler 11 is calcium bicarbonate. The calcium bicarbonate has the characteristic of decomposing when heated. When the calcium bicarbonate decomposes, water and calcium carbonate are produced. The calcium carbonate also decomposes when heated into carbon dioxide and calcium oxide. The water produced by the decomposition of the calcium bicarbonate absorbs heat when it evaporates, thereby reducing the temperature in the flame-retardant insulation sleeve 9. The water also has a flame-retardant effect, thereby preventing the spread of flames. The carbon dioxide produced by the decomposition of the calcium carbonate has a flame-retardant effect, and the calcium oxide has a high-temperature-resistant characteristic, thereby also having a flame-retardant effect. In this way, the risk of fire spreading can be greatly reduced.

[0025] When the external support strips 5 are heated, the elastic rubber film in the connecting holes 7 will break. At this time, the carbon dioxide produced by the decomposition of the calcium carbonate will enter the ventilation channel 6 through the connecting holes 7. In this way, part of the carbon dioxide can be transported to the area near the heated area of the cable through the ventilation channel 6, thereby expanding the heated area (carbon dioxide has good flame-retardant effect).

[0026] When the flame burns the present application, the flame-retardant insulation sleeve 9 will first play a flame-retardant effect, thereby preventing the flame from directly burning the present application. When the flame burns the flame-retardant insulation sleeve 9, the outer flame-retardant filler 11 will decompose and produce water and calcium carbonate when heated. The water can cool the flame-retardant insulation sleeve 9, thereby enhancing the high-temperature-resistant strength of the flame-retardant insulation sleeve 9. The calcium carbonate will continue to decompose into carbon dioxide and calcium oxide when heated. When the flame-retardant insulation sleeve 9 is burned through, the carbon dioxide will be released, thereby playing a flame-retardant effect and reducing the flame intensity of the flame (i.e. making the flame not burn vigorously). The calcium oxide has good heat insulation and flame-retardant effect, thereby further preventing the flame.

[0027] When the open flame burns through the shielding layer 4, the inner flame-retardant filler 10 in the protective layer 1 has begun to decompose under heat, and the inner flame-retardant filler 10 decomposes under heat to generate water crystals and absorb heat, and the water crystals evaporate under heat to absorb heat, in this way, the damage of the flame to the cable core 2 can be minimized, and finally the lead core 200 is also protected by the outer steel wire 201, and through the above-mentioned way, the present application can block the flame layer by layer, thereby greatly increasing the safety and flame retardancy of the present application, thereby increasing the reliability of the cable to ensure that the cable can still transmit power when being burned by an open flame.

[0028] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A fire-resistant cable with a stepped cooling structure, comprising a protective layer (1), characterized in that, The protective layer (1) is wrapped with several cable cores (2). An inner filling cavity (3) is provided between the protective layer (1) and the cable cores (2). The inner filling cavity (3) is filled with an inner flame-retardant filler (10). The cable core (2) includes a conductor (200). The conductor (200) is wrapped with insulating rubber. The conductor (200) is also wrapped with a high-temperature resistant rubber layer (202). The protective layer (1) is wrapped with a shielding layer (4), and the shielding layer (4) is also wrapped with a flame-retardant insulating sleeve (9). An outer filling cavity (8) is provided between the flame-retardant insulating sleeve (9) and the shielding layer (4), and the outer filling cavity (8) is filled with an outer flame-retardant filler (11). The inner flame-retardant filler (10) is aluminum hydroxide. Specifically, aluminum hydroxide can decompose at 200 degrees Celsius. Several external support strips (5) are fixedly connected to the outer wall of the shielding layer (4). The flame-retardant insulating sleeve (9) can be prevented from directly contacting the shielding layer (4) through the several external support strips (5). At the same time, the pressure resistance can be increased through the several external support strips (5). Ventilation channels (6) are opened inside the external support strips (5). Several connection holes (7) are also opened on the outer wall of the external support strips (5). An elastic rubber film is provided inside the connection holes (7). The outer flame-retardant filler (11) is calcium bicarbonate. Calcium bicarbonate has the characteristic of decomposing when heated. When calcium bicarbonate decomposes, it will produce water and calcium carbonate. Calcium carbonate will also decompose when heated. Calcium carbonate will decompose into carbon dioxide and calcium oxide when heated.

2. A fire-resistant cable with a stepped cooling structure according to claim 1, characterized in that, The protective layer (1) is an insulating yellow wax tube, and the insulating yellow wax tube is made of high temperature resistant glass fiber.

3. A fire-resistant cable with a stepped cooling structure according to claim 1, characterized in that, The outer side of the guide core (200) is also wrapped with several steel wires (201).

4. A fire-resistant cable with a stepped cooling structure according to claim 1, characterized in that, The high-temperature resistant rubber layer (202) is wrapped with an anti-corrosion layer (203), which prevents the internal flame-retardant filler (10) from corroding the high-temperature resistant rubber layer (202).

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