CN216772893U

CN216772893U - Flexible insulating mineral substance fireproof cable

Info

Publication number: CN216772893U
Application number: CN202123432301.6U
Authority: CN
Inventors: 王琥
Original assignee: YUNNAN YUNLAN CABLE (GROUP) CO Ltd
Current assignee: YUNNAN YUNLAN CABLE (GROUP) CO Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-06-17
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a flexible insulating mineral fireproof cable which comprises a plurality of groups of stranded conductors; the outer side of the single-group stranded conductor is sequentially coated with a first mica tape layer, a second mica tape layer, a third mica tape layer and a plastic insulating layer; the first mica tape layer and the third mica tape layer are wrapped along the longitudinal direction of the stranded conductor, the second mica tape layer is wrapped along the transverse direction of the stranded conductor, and the wrapping directions of the first mica tape layer and the third mica tape layer are opposite; a mineral filling layer is arranged on the outer side of the plastic insulating layer; and an outer sheath is arranged on the outer side of the mineral substance filling layer. According to the utility model, through the improvement of the traditional fireproof cable structure, the flame-retardant fireproof effect of the cable is further optimized under the condition that other fireproof measures are not additionally added.

Description

Flexible insulating mineral substance fireproof cable

Technical Field

The utility model relates to the technical field of fireproof cables, in particular to a flexible insulating mineral fireproof cable.

Background

With the wide application of automation technology, various electrical facilities are increased, and the load capacity of the electric wire and the electric cable is improved, so that the requirements on the flame-retardant and fireproof performance of the electric cable are higher and higher.

The traditional fireproof cable mostly comprises an insulating mineral substance layer and/or a mica tape layer, namely, the mica tape layer is directly coated on the outer side of the stranded conductor and the insulating mineral substance layer is filled, and although the structure has a certain flame-retardant fireproof effect, the flame-retardant fireproof performance still needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a flexible insulating mineral fireproof cable, which is improved in structure and further optimized in flame-retardant and fireproof effects under the condition of no addition of other fireproof measures.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a flexible insulated mineral fireproof cable comprises a plurality of groups of stranded conductors; the outer side of the single-group stranded conductor is sequentially coated with a first mica tape layer, a second mica tape layer, a third mica tape layer and a plastic insulating layer; the first mica tape layer and the third mica tape layer are wrapped along the longitudinal direction of the stranded conductor, the second mica tape layer is wrapped along the transverse direction of the stranded conductor, and the wrapping directions of the first mica tape layer and the third mica tape layer are opposite; a mineral filling layer is arranged on the outer side of the plastic insulating layer; and an outer sheath is arranged on the outer side of the mineral substance filling layer.

Preferably, the wrapping angles of the first mica tape layer, the second mica tape layer and the third mica tape layer are 40-50 degrees.

Preferably, the wrapping angle of the first mica tape layer, the second mica tape layer and the third mica tape layer is 45 °.

Preferably, the lapping overlapping rate of the first mica tape layer, the second mica tape layer and the third mica tape layer is 45% -55% of the bandwidth.

Preferably, the first mica tape layer, the second mica tape layer and the third mica tape layer are white mica tapes.

The utility model has the beneficial effects that:

on the basis of the traditional fireproof cable structure, the mica tape layer is structurally designed again, and the traditional mode is that transverse wrapping is directly carried out; according to the utility model, the mode of combining the transverse wrapping and the longitudinal wrapping is adopted, the directions of the two layers of transverse wrapping are opposite, and the cable is detected by a cable fire resistance test (a single-factor fire resistance test, a fire resistance water spray test and a fire resistance vibration test), so that the cable is not broken down within a longer fire resistance time, and the improved cable has better flame-retardant and fireproof effects.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure, 1-stranded conductor, 2-first mica tape layer, 3-second mica tape layer, 4-third mica tape layer, 5-plastic insulating layer, 6-mineral filling layer, 7-outer sheath.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, a flexible insulated mineral fireproof cable includes a plurality of sets of stranded conductors 1; the stranded conductor 1 in this embodiment is a single wire drawn by an electrolytic copper rod; the outer side of the single-group stranded conductor 1 is sequentially coated with a first mica tape layer 2, a second mica tape layer 3, a third mica tape layer 4 and a plastic insulating layer 5; the first mica tape layer 2 and the third mica tape layer 4 are wrapped along the longitudinal direction of the stranded conductor 1, the second mica tape layer 3 is wrapped along the transverse direction of the stranded conductor 1, and the wrapping directions of the first mica tape layer 2 and the third mica tape layer 4 are opposite; a mineral filling layer 6 is arranged on the outer side of the plastic insulating layer 5; and an outer sheath 7 is arranged on the outer side of the mineral substance filling layer 6.

The mineral filling layer 6 in the utility model has the function of protecting the plastic insulating layer 5 at the inner layer from flame erosion when combustion occurs, and has the functions of isolating heat and preventing the insulating layer from melting.

The outer sheath 7 of the utility model is made of high flame-retardant halogen-free flame-retardant polyolefin material.

Preferably, the lapping angle of the first mica tape layer 2, the second mica tape layer 3 and the third mica tape layer 4 is 40-50 degrees.

Preferably, the wrapping angles of the first mica tape layer 2, the second mica tape layer 3 and the third mica tape layer 4 are 45 °.

Preferably, the lapping overlapping rate of the first mica tape layer 2, the second mica tape layer 3 and the third mica tape layer 4 is 45% -55% of the bandwidth.

Preferably, the first mica tape layer 2, the second mica tape layer 3 and the third mica tape layer 4 are white mica tapes.

In order to verify the fire resistance of the cable, the fire resistance test is carried out by adopting the standard of the BS8491-2008 fire resistance condition, and the fire resistance test comprises a single-factor fire resistance test, a fire resistance water spraying test and a fire resistance vibration test.

Test results show that the cable meets standards in a single-factor fire resistance test, a fire-resistant water spray test and a fire-resistant vibration test, the time required for the cable to be punctured is longer than that of a cable which is coated with a mica tape in a common mode, and the improved cable is better in flame-retardant and fireproof effects.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the utility model, and these embodiments are still within the scope of the utility model.

Claims

1. A flexible insulated mineral fireproof cable comprises a plurality of groups of stranded conductors (1); the method is characterized in that: the outer side of the single-group stranded conductor (1) is sequentially coated with a first mica tape layer (2), a second mica tape layer (3), a third mica tape layer (4) and a plastic insulating layer (5); the first mica tape layer (2) and the third mica tape layer (4) are wrapped along the longitudinal direction of the stranded conductor (1), the second mica tape layer (3) is wrapped along the transverse direction of the stranded conductor (1), and the wrapping directions of the first mica tape layer (2) and the third mica tape layer (4) are opposite; a mineral filling layer (6) is arranged on the outer side of the plastic insulating layer (5); an outer sheath (7) is arranged on the outer side of the mineral substance filling layer (6).

2. The flexible insulated mineral fireproof cable of claim 1, wherein: the lapping angles of the first mica tape layer (2), the second mica tape layer (3) and the third mica tape layer (4) are 40-50 degrees.

3. The flexible insulated mineral fireproof cable of claim 2, wherein: the lapping angles of the first mica tape layer (2), the second mica tape layer (3) and the third mica tape layer (4) are 45 degrees.

4. The flexible insulated mineral fire-protected cable of claim 1, wherein: the lapping overlapping rate of the first mica tape layer (2), the second mica tape layer (3) and the third mica tape layer (4) is 45% -55% of the bandwidth.

5. The flexible insulated mineral fireproof cable of claim 1, wherein: the first mica tape layer (2), the second mica tape layer (3) and the third mica tape layer (4) are white mica tapes.