CN210956258U - Fire-resistant shielding type cable - Google Patents

Abstract

The utility model discloses a belong to the technical field of cable equipment, specifically disclose a fire-resistant shielding type cable, include the cable core and wrap up insulating layer, filling layer and the fire-retardant oversheath in the cable core outside in proper order, be provided with the shielding layer between filling layer and the insulating layer, the shielding layer includes weaving layer, tin paper layer and mineral substance layer, just weaving layer, tin paper layer and mineral substance layer set gradually from outside to inside, the mineral substance layer with the insulating layer contact. The utility model discloses a set up the shielding layer between insulating layer and the filling layer to keep apart external fire source, avoid the fire source with cable core direct contact burns out the cable core specifically, through weaving layer and tinfoil layer realize with the cable core keeps apart with external magnetic field and reaches shielded effect, avoids receiving magnetic field interference.

Description

Fire-resistant shielding type cable

Technical Field

The utility model belongs to the technical field of cable equipment's technique and specifically relates to a fire-resistant shielding type cable.

Background

Cables are widely used, and are closely related to work and life of people, and the cables generally comprise a conductor core, an insulating layer, a filling layer and a flame-retardant outer sheath from inside to outside. When remote power transmission is carried out, the cable is required to be ensured to have the transmission performance of the system under the electromagnetic interference environment, wherein the anti-interference performance comprises two aspects, namely the capacity of resisting external electromagnetic interference and the capacity of radiating electromagnetic interference outwards by the system, and the integrity of a circuit is required to be ensured in the case of fire, so that the function of a key emergency system is ensured to be safely and normally operated.

On this basis, how to make the cable have fire resistance and shielding performance is a technical problem that needs to be solved by those skilled in the art at present.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model aims at providing a fire-resistant shielding type cable.

In order to achieve the above purpose, the technical scheme of the utility model is that:

the utility model provides a fire-resistant shielding type cable, includes the cable core and wraps up insulating layer and fire-retardant oversheath in the cable core outside in proper order, be provided with the shielding layer between filling layer and the insulating layer, the shielding layer includes weaving layer, tin paper layer and mineral substance layer, just weaving layer, tin paper layer and mineral substance layer set gradually from outside to inside, the mineral substance layer with the insulating layer contact.

Further, the weaving layer is a metal material woven mesh.

Furthermore, the surface of the woven layer is sprayed with insulating paint.

Further, the mineral layer is a mineral expansion material

Further, the mineral expansion material is composed of aluminum hydroxide or magnesium hydroxide and an expanding agent.

Further, a metal mesh is arranged in the flame-retardant outer sheath.

Compared with the prior art, the utility model provides a fire-resistant shielding type cable structure is distinctive, convenient operation, through set up the shielding layer between insulating layer and the filling layer, in order to keep apart external source of a fire, avoid source of a fire and cable core direct contact, burn out the cable core, specifically, through weaving layer and tinfoil layer realize with the magnetic field isolation of cable core and external world reach the shielding effect, avoid receiving magnetic field interference, and set up the mineral substance layer between tinfoil layer and insulating layer and realize avoiding insulating layer and fire-retardant oversheath lead to after burning out under high temperature the cable core leads to with the contact of tinfoil and external short circuit, cause the electric shock danger, the mineral substance layer can not damaged under the high temperature that the conflagration produced, through the support of mineral substance layer realizes that the cable core is kept apart from the external world, and through the mineral substance layer is in the outside of cable core forms stable insulating layer, the protection of the cable core is realized, so that the cable core can normally work in a fire disaster, and in addition, the situation that fire-fighting water penetrates through the woven layer and the mineral layer to be in contact with the cable core to cause short circuit and the cable cannot normally work when the fire disaster happens is realized by arranging the tinfoil layer, namely, the external water source is isolated by the tinfoil layer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a fire-resistant shielded cable.

In the figure: 1. the cable comprises a flame-retardant outer sheath, 2 parts of a woven layer, 3 parts of a tinfoil layer, 4 parts of a mineral layer, 5 parts of an insulating layer and 6 parts of a cable core.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, as a fire-resistant shielding cable according to a preferred embodiment of the present invention, including a cable core 6, and an insulating layer 5 and a fire-retardant outer sheath 1 sequentially wrapped outside the cable core 6, it should be noted that the specific installation manner of the insulating layer 5, the filling layer and the fire-retardant outer sheath 1 is prior art and is not repeated in detail, a shielding layer is disposed between the filling layer and the insulating layer 5, the shielding layer includes a braid layer 2, a tinfoil layer 3 and a mineral layer 4, and the braid layer 2, the tinfoil layer 3 and the mineral layer 4 are sequentially disposed from outside to inside, it should be noted that the braid layer 2 is a metal mesh braid, the cable core 6 is wrapped by the fine braid layer 2 and the tinfoil layer 3 to achieve shielding and isolation, so as to avoid interference of an external magnetic field, the mineral layer 4 is in contact with the insulating layer 5, and the gap between the tinfoil layer 3 and the insulating layer 5 is filled by the mineral layer, the mineral layer 4 is bound by the woven layer 2 and the tinfoil layer 3 to support the cable core 6, and due to the characteristic of the mineral, the cable core 6 can be supported and surrounded in a fire disaster, the cable core 6 is protected, the cable core 6 is prevented from contacting with the outside, the integrity of a circuit can be kept under the condition of the fire disaster, and the safe and normal operation of the functions of a key emergency system is ensured;

when the fire-resistant shielding type cable provided by the utility model is applied, the shielding layer is arranged between the insulating layer 5 and the filling layer to isolate the external fire source, avoid the direct contact between the fire source and the cable core 6 and burn out the cable core 6, in particular, the cable core 6 is isolated from the external magnetic field by the braid layer 2 and the tinfoil layer 3 to achieve the shielding effect and avoid the magnetic field interference, and the mineral layer 4 is arranged between the tinfoil layer 3 and the insulating layer 5 to avoid the electric shock hazard caused by the contact between the cable core 6 and the tinfoil and the external short circuit after the insulating layer 5 and the flame-retardant outer sheath 1 are burnt out at high temperature, the mineral layer 4 can not be damaged at the high temperature generated by fire, the cable core 6 is isolated from the external by the support of the mineral layer 4, and the stable heat insulation layer is formed outside the cable core 6 by the mineral layer 4, the protection of the cable core 6 is realized, so that the cable core 6 is kept to normally work in a fire disaster, and in addition, the situation that the fire-fighting water penetrates through the woven layer 2 and the mineral layer 4 to be in contact with the cable core 6 to cause short circuit and the cable cannot normally work when the fire disaster happens is avoided by arranging the tin paper layer 3, namely, the tin paper layer 3 is used for isolating an external water source.

Specifically, the braid 2 is a metal mesh grid, and the metal shielding layer can effectively filter out electromagnetic waves generated by an unnecessary surrounding magnetic field, and must be grounded completely, so that interference current can be effectively conducted to the ground to realize shielding.

Preferably, insulating paint is sprayed on the surface of the braided layer 2, so that the surface insulation of the braided layer 2 is realized, and the situation that the braided layer 2 is contacted with other exposed cables to conduct electricity after the flame-retardant outer sheath 1 is burnt out, and the normal power supply of the cable core 6 wrapped by the braided layer 2 is influenced is avoided.

On the basis of the embodiment, the mineral layer 4 is a mineral expansion material, the mineral expansion material can expand due to heating to form a stable heat insulation layer, the invasion of heat can be effectively prevented, the heating temperature of the cable core 6 in the filling layer is obviously lower than the external temperature, and the cable core has good fire-resistant and flame-retardant properties

More specifically, the mineral expanding material is composed of aluminum hydroxide or magnesium hydroxide and an expanding agent, and the aluminum hydroxide or magnesium hydroxide and the expanding agent are the prior art and are common general knowledge of the skilled person, and are not described in detail herein.

In order to improve the strength of the cable, a steel wire mesh is arranged in the flame-retardant outer sheath 1, the strength of the flame-retardant outer sheath 1 is improved by pulling the steel wire mesh, the steel wire mesh can support an external falling object to avoid breaking the cable, a distance is kept between the burning falling object and the cable core 6, the cable core 6 is prevented from being in direct contact, and the cable plays a role in protection.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The utility model provides a fire-resistant shielding type cable, includes cable core (6) and wraps up insulating layer (5) and fire-retardant oversheath (1) in cable core (6) outside in proper order, its characterized in that is provided with the shielding layer between filling layer and insulating layer (5), the shielding layer includes weaving layer (2), tin paper layer (3) and mineral substance layer (4), just weaving layer (2), tin paper layer (3) and mineral substance layer (4) set gradually from outer to inner, mineral substance layer (4) with insulating layer (5) contact.

2. Fire-resistant shielded cable according to claim 1, characterized in that the braid (2) is a woven mesh of metal material.

3. Fire-resistant shielded cable according to claim 2, characterized in that the surface of the braid (2) is sprayed with an insulating varnish.

4. Fire-resistant shielded cable according to claim 1, characterized in that the mineral layer (4) is a mineral intumescent.

5. The flame-resistant shielded cable of claim 4, wherein the mineral intumescent material is comprised of aluminum hydroxide or magnesium hydroxide plus an intumescent agent.

6. Fire-resistant shielded cable according to claim 1, characterized in that a metal mesh is provided inside the flame-retardant outer sheath (1).

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