A polyethylene insulated cable capable of fast flame retardation

Abstract

The application relates to the cable field and discloses a polyethylene insulated cable capable of achieving rapid fire retardation, which comprises a cable core, the outer side of the cable core is wrapped with tin foil paper, the outer side of the tin foil paper is fixed with a first insulating layer, the outer side of the first insulating layer is fixed with a second insulating layer, and the second insulating layer is fixed with rapid fire-retardation mechanisms uniformly in the circumferential direction. The polyethylene insulated cable capable of achieving rapid fire retardation can achieve the purpose of rapid and local fire retardation. The first metal box stores aluminum sulfate solution, the second metal box stores sodium bicarbonate solution, when the device encounters fire, the plastic frame is broken, the diaphragm is broken, the aluminum sulfate solution and the sodium bicarbonate solution are mixed to produce a large amount of carbon dioxide foam, the carbon dioxide foam breaks the metal baffle to spray the combustible material, rapid fire retardation can be realized, the rapid fire-retardation mechanisms are arranged in groups, the groups of rapid fire-retardation mechanisms are distributed at equal intervals, local fire extinguishing can be realized, and the fire spreading can be effectively inhibited.

Description

Technical Field

[0001] This invention relates to the field of cables, and more specifically to a polyethylene insulated cable that can quickly retard flames. Background Technology

[0002] Cables are made of one or more mutually insulated conductors and an outer insulating protective layer. They are laid underground, in the air, etc. Among them, polyethylene (PE) cables are widely used because of their good electrical insulation and processing performance.

[0003] However, ordinary polyethylene is a flammable material with a limiting oxygen index (LOI) of only about 17%. When exposed to fire, it is extremely easy to burn and drip molten material, which helps the fire spread. It has poor flame retardant effect, is difficult to extinguish locally, and has high maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a polyethylene insulated cable that can quickly retard flames, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a polyethylene insulated cable with rapid flame retardancy, comprising a cable core, the cable core being wrapped with tin foil, a first insulating layer being fixed to the outside of the tin foil, a second insulating layer being fixed to the outside of the first insulating layer, and a rapid flame retardant mechanism being uniformly fixed circumferentially within the second insulating layer.

[0006] Preferably, the rapid flame retardant mechanism includes a first metal box and a second metal box, and both the first metal box and the second metal box are fixed inside the second insulating layer, with a plastic frame fixed between the first metal box and the second metal box.

[0007] Preferably, the first metal box and the second metal box are connected by a metal connecting piece, and the metal connecting piece is circumferentially and uniformly fixed on the outside of the plastic frame.

[0008] Preferably, a diaphragm is fixed to the inner side of the plastic frame.

[0009] Preferably, the second metal box has through holes, and the through holes are distributed in a rectangular array on the second metal box.

[0010] Preferably, a metal baffle is fixed on the inner wall of the through hole, and two sets of metal baffles are provided in each through hole, with four metal baffles in each set, and the four metal baffles are evenly distributed circumferentially in the through hole.

[0011] Preferably, a wear-resistant layer is fixed to the outer side of the second insulating layer.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This rapidly flame-retardant polyethylene insulated cable, through the coordinated use of the cable core, rapid flame-retardant mechanism, first metal box, second metal box, plastic frame, diaphragm, and metal baffle, can achieve rapid and localized flame retardancy. The first metal box contains aluminum sulfate solution, and the second metal box contains sodium bicarbonate solution. When the device is exposed to fire, the plastic frame breaks, the diaphragm breaks, and the aluminum sulfate solution and sodium bicarbonate solution react to produce a large amount of carbon dioxide foam. The carbon dioxide foam breaks through the metal baffle and sprays out to cover the combustibles, thus achieving rapid flame retardancy. The rapid flame-retardant mechanism is provided in several groups, and the groups of rapid flame-retardant mechanisms are evenly distributed, which can achieve local fire extinguishing and effectively suppress the spread of fire. 2. This fast-flame-retardant polyethylene insulated cable, through the combined use of tin foil, a first insulation layer, a second insulation layer, and a wear-resistant layer, can achieve the purposes of anti-interference, insulation protection, and wear resistance. The tin foil can prevent cross-interference between strong and weak currents, the first and second insulation layers can provide insulation protection, and the wear-resistant layer has good wear resistance, making the device more durable. Attached Figure Description

[0013] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0014] Figure 1 This is a frontal cross-sectional view of the present invention. Figure 2 This is a side cross-sectional view of the present invention. Figure 3 This is a front view cross-sectional structural diagram of the rapid flame retardant mechanism of the present invention; Figure 4 This is a three-dimensional structural diagram of the rapid flame-retardant mechanism of the present invention; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0015] In the diagram: 1. Cable core; 2. Tin foil; 3. First insulation layer; 4. Second insulation layer; 5. Fast flame retardant mechanism; 501. First metal box; 502. Second metal box; 503. Plastic frame; 504. Metal connecting piece; 505. Diaphragm; 506. Through hole; 507. Metal baffle; 6. Wear-resistant layer. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1 to 5 The present invention provides a technical solution: a polyethylene insulated cable that can quickly retard flame, comprising a cable core 1, a tin foil 2 wrapped around the outside of the cable core 1, a first insulation layer 3 fixed on the outside of the tin foil 2, a second insulation layer 4 fixed on the outside of the first insulation layer 3, and a fast flame retardant mechanism 5 uniformly fixed in the inner circumference of the second insulation layer 4.

[0018] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the rapid flame retardant mechanism 5 includes a first metal box 501 and a second metal box 502, both of which are fixed inside the second insulating layer 4. A plastic frame 503 is fixed between the first metal box 501 and the second metal box 502. The first metal box 501 and the second metal box 502 respectively store aluminum sulfate and sodium bicarbonate solutions. After the plastic frame 503 melts and breaks when exposed to fire, the aluminum sulfate and sodium bicarbonate solutions react together to produce a large amount of carbon dioxide foam that covers the combustible material, thus achieving a rapid flame retardant effect.

[0019] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the first metal box 501 and the second metal box 502 are connected by a metal connecting piece 504, and the metal connecting piece 504 is evenly fixed on the outside of the plastic frame 503 in a circumferential direction. The metal connecting piece 504 serves to connect the first metal box 501 and the second metal box 502, making the structure more compact and sturdy.

[0020] In this embodiment, as Figure 1 and Figure 3 As shown, a diaphragm 505 is fixed on the inner side of the plastic frame 503. The diaphragm 505 can separate the solution in the first metal box 501 from the solution in the second metal box 502. After the plastic frame 503 melts and breaks when exposed to fire, the diaphragm 505 breaks, and the aluminum sulfate solution in the first metal box 501 and the sodium bicarbonate solution in the second metal box 502 mix and react.

[0021] In this embodiment, as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the second metal box 502 has through holes 506, and the through holes 506 are distributed in a rectangular array on the second metal box 502. The aluminum sulfate solution in the first metal box 501 reacts with the sodium bicarbonate solution in the second metal box 502 to produce a large amount of carbon dioxide foam. The carbon dioxide foam is sprayed out through the through holes 506, which can achieve the effect of rapid flame retardancy.

[0022] In this embodiment, as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, metal baffles 507 are fixed on the inner wall of the through hole 506, and two sets of metal baffles 507 are provided in each through hole 506. Each set of metal baffles 507 has four metal baffles 507, and the four metal baffles 507 are evenly distributed circumferentially in the through hole 506. The metal baffles 507 block the sodium bicarbonate solution in the second metal box 502. When the aluminum sulfate solution in the first metal box 501 reacts with the sodium bicarbonate solution in the second metal box 502 to produce a large amount of carbon dioxide foam, the carbon dioxide foam breaks through the metal baffles 507 and sprays out, which facilitates flame retardancy at the corresponding position and can achieve the effect of local flame retardancy.

[0023] In this embodiment, as Figure 1 and Figure 2 As shown, a wear-resistant layer 6 is fixed to the outside of the second insulating layer 4. The wear-resistant layer 6 has good wear resistance, making the device more durable.

[0024] The method of use and advantages of this invention: The working process of this fast-flame-retardant polyethylene insulated cable is as follows: like Figures 1 to 5 As shown: tin foil 2 can prevent cross-interference between strong and weak currents; the first insulating layer 3 and the second insulating layer 4 can provide insulation; the wear-resistant layer 6 can provide wear resistance; the first metal box 501 stores aluminum sulfate solution; and the second metal box 502 stores sodium bicarbonate solution. When the device is exposed to fire, the plastic frame 503 melts and breaks, the diaphragm 505 breaks, and the aluminum sulfate solution and sodium bicarbonate solution react to produce a large amount of carbon dioxide foam. The carbon dioxide foam breaks through the metal baffle 507 and sprays out from the through hole 506 to cover the combustible material, achieving a localized rapid flame retardant effect. Several sets of rapid flame retardant mechanisms 5 are provided, and these sets of rapid flame retardant mechanisms 5 are evenly distributed within the second insulating layer 4, enabling localized fire extinguishing.

[0025] In summary, this rapidly flame-retardant polyethylene insulated cable achieves rapid and localized flame retardancy, interference resistance, sterilization protection, and abrasion resistance, thus meeting people's usage needs.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0027] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polyethylene insulated cable with rapid flame retardancy, comprising a cable core (1), characterized in that: The outer side of the cable core (1) is wrapped with tin foil (2), and a first insulating layer (3) is fixed on the outer side of the tin foil (2). A second insulating layer (4) is fixed on the outer side of the first insulating layer (3), and a fast flame-retardant mechanism (5) is uniformly fixed in the inner circumference of the second insulating layer (4).

2. The polyethylene insulated cable with rapid flame retardancy according to claim 1, characterized in that: The rapid flame retardant mechanism (5) includes a first metal box (501) and a second metal box (502), and both the first metal box (501) and the second metal box (502) are fixed inside the second insulating layer (4). A plastic frame (503) is fixed between the first metal box (501) and the second metal box (502).

3. The polyethylene insulated cable with rapid flame retardancy according to claim 2, characterized in that: The first metal box (501) and the second metal box (502) are connected by a metal connecting piece (504), and the metal connecting piece (504) is uniformly fixed on the outside of the plastic frame (503) in a circumferential direction.

4. The polyethylene insulated cable with rapid flame retardancy according to claim 2, characterized in that: A diaphragm (505) is fixed to the inside of the plastic frame (503).

5. A polyethylene insulated cable with rapid flame retardancy according to claim 2, characterized in that: The second metal box (502) has through holes (506), and the through holes (506) are distributed in a rectangular array on the second metal box (502).

6. A rapidly flame-retardant polyethylene insulated cable according to claim 5, characterized in that: Metal baffles (507) are fixed on the inner wall of the through hole (506), and two sets of metal baffles (507) are provided in each through hole (506). Each set of metal baffles (507) has four baffles, and the four metal baffles (507) are evenly distributed in the circumferential direction within the through hole (506).

7. The polyethylene insulated cable with rapid flame retardancy according to claim 1, characterized in that: A wear-resistant layer (6) is fixed to the outside of the second insulating layer (4).

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