CN219418566U - Flame-retardant structure of cable - Google Patents

Abstract

The utility model discloses a flame-retardant structure of a cable, which comprises a polyurethane outer sheath, wherein an outer flame-retardant layer is arranged on the inner side of the polyurethane outer sheath, an outer aluminum foil wrapping layer is arranged on the inner side of the outer flame-retardant layer, an inner flame-retardant filling layer is arranged on the inner side of the outer aluminum foil wrapping layer, and high-polymer flame-retardant particles are arranged on the inner side of the inner flame-retardant filling layer. According to the structure, the outer flame-retardant layer is additionally arranged in the polyurethane outer sheath at the outer side of the cable, the inner flame-retardant filling layer with the high-molecular flame-retardant particles is additionally arranged at the inner side of the cable, the flame-retardant effect of the section of the cable can be further reduced, meanwhile, the flame-retardant sheath is additionally arranged at the outer side of the cable core, the first flame-retardant layer and the second flame-retardant layer are alternately arranged between the first polyurethane sheath layer and the second polyurethane sheath layer of the flame-retardant sheath, and the high-efficiency direct flame-retardant protection can be carried out after the high temperature is generated in the short circuit of the cable core, so that the economic loss caused by the short circuit fault of the cable is effectively reduced.

Description

A flame retardant structure of a cable

technical field

The utility model belongs to the technical field of insulating cables, in particular to a flame-retardant structure of cables.

Background technique

A cable refers to a wire made of one or more mutually insulated conductors and an outer insulating protective layer, which transmits power or information from one place to another, and the flame retardancy of the cable is mainly to prevent the fire from spreading along the cable after the cable is short-circuited.

The patent announcement number CN202120773767.3 retrieved through the China Patent Network is a high-temperature-resistant insulated cable with a flame-retardant structure. The content roughly includes an inner shell. At present, the flame-retardant structure of the cables in the prior art is relatively simple. Since most cables adopt a multi-core structure, and the existing technology adds a flame-retardant layer in the center of the outer shell, but the short circuit is mostly caused by the core position, gradually spreads to the periphery of the cross-section, and finally spreads along the cable. Therefore, in the actual use process, the flame-retardant effect is not ideal, so technical improvements are needed.

Utility model content

Aiming at the problems mentioned in the background technology, the purpose of this utility model is to provide a flame-retardant structure of cables to solve the problems mentioned in the above background technology.

The above-mentioned technical purpose of the utility model is achieved through the following technical solutions:

A flame retardant structure of a cable, comprising a polyurethane outer sheath, an outer flame retardant layer is provided on the inner side of the polyurethane outer sheath, an outer aluminum foil wrapping layer is arranged on the inner side of the outer flame retardant layer, an inner flame retardant filling layer is arranged on the inner side of the outer aluminum foil wrapping layer, polymer flame retardant particles are arranged on the inner side of the inner flame retardant filling layer, an inner aluminum foil wrapping layer is arranged on the inner side of the inner flame retardant filling layer, a flame retardant sheath is arranged on the inner side of the inner aluminum foil wrapping layer, and a wire core is arranged on the inner side of the flame retardant sheath.

Further, as a preferred technical solution, a shielding braiding layer is provided between the outer flame retardant layer and the outer aluminum foil wrapping layer, and the shielding braiding layer is specifically braided by 5 strands of copper wire warp and 5 strands of copper wire weft.

Further, as a preferred technical solution, a wrapping layer of polyvinyl chloride is provided between the inner flame-retardant filling layer and the outer aluminum foil wrapping layer.

Further, as a preferred technical solution, four inner aluminum foil wrapping layers are arranged at equal angles on the inner side of the inner flame-retardant filling layer.

Further, as a preferred technical solution, the flame retardant sheath includes a first polyurethane sheath layer and a second polyurethane sheath layer, a first flame retardant layer is provided between the first polyurethane sheath layer and the second polyurethane sheath layer, and a second flame retardant layer is provided inside the second polyurethane sheath layer.

Further, as a preferred technical solution, a talcum powder layer is provided on the inner side of the second flame-retardant layer.

Further, as a preferred technical solution, a heat-resistant layer is provided between the polyurethane outer sheath and the outer flame-retardant layer, and the heat-resistant layer is specifically made of nitrogen-iron-boron fiber material.

In summary, the utility model mainly has the following beneficial effects:

By adding an outer flame retardant layer inside the polyurethane outer sheath on the outside of the cable, and adding an inner flame retardant filling layer with polymer flame retardant particles on the inner side of the cable, the flame retardant effect of the cable section can be further reduced.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the flame retardant sheath of the present utility model;

Fig. 3 is an enlarged view of A in Fig. 1 of the present utility model.

Reference signs: 1, polyurethane outer sheath, 2, outer flame retardant layer, 3, shielding braiding layer, 4, outer aluminum foil wrapping layer, 5, inner aluminum foil wrapping layer, 6, flame retardant sheath, 601, first polyurethane sheath layer, 602, first flame retardant layer, 603, second polyurethane sheath layer, 604, second flame retardant layer, 7, wire core, 8, talcum powder layer, 9, polyvinyl chloride wrapping layer, 10, inner flame retardant filling layer, 11, polymer Flame-retardant particles, 12, heat-resistant layer.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

Referring to Figures 1-3, the flame retardant structure of a cable described in this embodiment includes a polyurethane outer sheath 1, an outer flame retardant layer 2 is provided on the inner side of the polyurethane outer sheath 1, an outer aluminum foil wrapping layer 4 is arranged on the inner side of the outer flame retardant layer 2, an inner flame retardant filling layer 10 is arranged on the inner side of the outer aluminum foil wrapping layer 4, a polymer flame retardant particle 11 is arranged on the inner side of the inner flame retardant filling layer 10, an inner aluminum foil wrapping layer 5 is provided on the inner side of the inner flame retardant filling layer 10, and an inner aluminum foil wrapping layer 5 is provided on the inner side. The inner side of the sheath 6 and the flame-retardant sheath 6 is provided with a wire core 7; the inner side of the inner flame-retardant filling layer 10 is provided with four inner aluminum foil wrapping layers 5 at equal angles. By adding four inner aluminum foil wrapping layers 5 at equal angles inside the inner flame-retardant filling layer 10, the four strands of cable cores 7 can be easily protected; a heat-resistant layer 12 is provided between the polyurethane outer sheath 1 and the outer flame-retardant layer 2. The heat-resistant layer 12 is specifically made of nitrogen boron fiber material. The heat-resistant layer 12 is provided, and when a fire occurs outside the cable, it can prevent burning from spreading from the outside to the inside of the cable section, thereby further improving the reliability of the cable's flame retardancy.

Example 2

Referring to Fig. 1, in order to achieve the purpose of improving the anti-interference ability of the cable, a shielding braiding layer 3 is provided between the outer flame retardant layer 2 and the outer aluminum foil wrapping layer 4 in this embodiment. The shielding braiding layer 3 is specifically woven with 5 strands of copper wire warp and 5 strands of copper wire weft. By adding a shielding braiding layer 3 between the outer flame retardant layer 2 and the outer aluminum foil wrapping layer 4, the inner core 7 of the cable can be prevented from being disturbed.

Referring to Fig. 3, in order to achieve the purpose, in this embodiment, a polyvinyl chloride wrapping layer 9 is provided between the inner flame-retardant filling layer 10 and the outer aluminum foil wrapping layer, and the inner flame-retardant filling layer 10 can be reinforced after winding with a tensile effect by adding a polyvinyl chloride wrapping layer 9 between the inner flame-retardant filling layer 10 and the outer aluminum foil wrapping layer.

Example 3

Referring to Figures 1-2, this embodiment is based on Example 1. In order to achieve the purpose of improving the flame-retardant effect of the cable, this embodiment innovatively designs the flame-retardant sheath 6. Specifically, the flame-retardant sheath 6 includes a first polyurethane sheath layer 601 and a second polyurethane sheath layer 603. The flame-retardant sheath 6 is added, and the first flame-retardant layer 602 and the second flame-retardant layer 604 are alternately added between the first polyurethane sheath layer 601 and the second polyurethane sheath layer 603 of the flame-retardant sheath 6, which can provide efficient and direct flame-retardant protection after the wire core 7 is short-circuited to generate high temperature.

Referring to Fig. 2, in order to achieve the purpose of improving the service life of the second flame-retardant layer 604, the inner side of the second flame-retardant layer 604 of the present embodiment is provided with a talcum powder layer 8, and by adding a talc powder layer 8 inside the second flame-retardant layer 604, the frictional conflict between the wire core 7 and the second flame-retardant layer 604 can be reduced and the service life can be improved.

Principles of use and advantages: When used, by adding a polyurethane outer sheath 1 with an outer flame-retardant layer 2 on the periphery of the cable section, the flame-retardant effect on the outer periphery of the cable section can be improved, and adding an inner flame-retardant filling layer 10 with polymer flame-retardant particles 11 on the inner side of the cable can further reduce the flame-retardant effect of the cable section. By adding a flame-retardant sheath 6 on the outside of the wire core 7, the first flame-retardant layer 602 is alternately added between the first polyurethane sheath layer 601 and the second polyurethane sheath layer 603 of the flame-retardant sheath 6. With the second flame retardant layer 604, it can provide efficient and direct flame retardant protection after the wire core 7 is short-circuited to generate high temperature. Adding a shielding braid 3 between the outer flame retardant layer 2 and the outer aluminum foil wrapping layer 4 can improve the anti-interference effect of the cable.

Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A flame retardant structure of a cable, characterized in that: comprise a polyurethane outer sheath (1), the inner side of the polyurethane outer sheath (1) is provided with an outer flame retardant layer (2), the inner side of the outer flame retardant layer (2) is provided with an outer aluminum foil wrapping layer (4), the inner side of the outer aluminum foil wrapping layer (4) is provided with an inner flame retardant filling layer (10), the inner side of the inner flame retardant filling layer (10) is provided with polymer flame retardant particles (11), and the inner side of the inner flame retardant filling layer (10) is provided with The inner aluminum foil wrapping layer (5), the inner side of the inner aluminum foil wrapping layer (5) is provided with a flame retardant sheath (6), and the inner side of the flame retardant sheath (6) is provided with a wire core (7). 2. The flame-retardant structure of a cable according to claim 1, characterized in that: a shielding braid (3) is arranged between the outer flame-retardant layer (2) and the outer aluminum foil wrapping layer (4), and the shielding braid (3) is woven by using 5 strands of copper wire warp and 5 strands of copper wire weft. 3. The flame-retardant structure of a cable according to claim 1, characterized in that: a polyvinyl chloride wrapping layer (9) is provided between the inner flame-retardant filling layer (10) and the outer aluminum foil wrapping layer. 4. The flame retardant structure of a cable according to claim 1, characterized in that 4 inner aluminum foil wrapping layers (5) are provided on the inner side of the inner flame retardant filling layer (10) at equal angles. 5. The flame retardant structure of a cable according to claim 1, characterized in that: the flame retardant sheath (6) comprises a first polyurethane sheath layer (601) and a second polyurethane sheath layer (603), a first flame retardant layer (602) is provided between the first polyurethane sheath layer (601) and the second polyurethane sheath layer (603), and a second flame retardant layer (604) is provided inside the second polyurethane sheath layer (603). 6. A flame-retardant cable structure according to claim 5, characterized in that: a talcum powder layer (8) is provided on the inner side of the second flame-retardant layer (604). 7. The flame-retardant structure of a cable according to claim 1, characterized in that: a heat-resistant layer (12) is arranged between the polyurethane outer sheath (1) and the outer flame-retardant layer (2), and the heat-resistant layer (12) is specifically made of nitrogen-iron-boron fiber material.