CN203260337U - Fireproof composite cable - Google Patents

Abstract

The utility model discloses a fire-resistant composite cable. The cable includes a cable core, a tape layer and a fire-resistant sheath from inside to outside. The tape layer is tightly covered on the cable core, and the fire-resistant sheath is covered On the tape layer; the cable core is composed of power lines, control lines and signal transmission lines uniformly twisted; the gaps between the twisted cable cores and between the cable core and the tape layer are filled with flame-retardant materials; the utility model The power line, control line and signal transmission line are effectively combined into one body, which reduces the electromagnetic interference between different cables, has high reliability in use, and is very convenient for laying, which simplifies engineering construction operations; cost. The utility model not only has superior anti-interference shielding and fire-resistant performance (fire-resistant temperature can reach 1000 ℃), but also has the characteristics of reasonable structure, good flexibility, long service life, safety and reliability, etc., and can fully meet the needs of high-rise buildings, subway tunnels, etc. , power stations and other occasions application requirements.

Description

A fire-resistant composite cable

technical field

The utility model relates to the field of cables, in particular to a fire-resistant composite cable. The cable combines a coaxial cable for transmitting video images, a digital cable for transmitting digital communications, and a control circuit into an integrated structure; it is especially suitable for monitoring equipment with high requirements. Also suitable for other electrical equipment.

Background technique

With the rapid development of science and technology, in recent years, in high-rise buildings, subway tunnels, power stations and other occasions, once a fire occurs, it is necessary to evacuate the flow of people in time, rescue important facilities, and carry out fire fighting and disaster relief operations. A certain period of time ensures that lighting circuits, elevators and fire-fighting facilities can operate normally and effectively, and can effectively prevent secondary disasters. This puts a severe test on the fire resistance of cables for emergency equipment such as lighting circuits, elevators, and fire-fighting facilities. In addition, the monitoring equipment can operate normally and effectively in this case, and it also plays an escort role in accident analysis and social security management. The monitoring equipment is mainly composed of a front-end part (camera, monitor, etc.), a transmission part and a back-end part (central control equipment, sub-control equipment, etc.), among which, the transmission part is usually composed of two transmission cables, one cable is the The video images and other information collected by the front-end part are sent to the back-end part, and the other cable is to send the control information (digital communication signal) sent by the back-end part to the front-end part. When this type of transmission cable is pre-embedded in the monitoring equipment installation process, two line pipes need to be pre-embedded, and the subsequent threading needs to be divided into two times, which not only increases the labor intensity of the installation workers, but also reduces the installation efficiency. Moreover, it also causes waste of wire tubes, increases installation costs, and is not conducive to cable management.

The Chinese patent literature discloses the name "fire-resistant composite cable for smart grid" (publication number: CN201975142U, publication date: September 14, 2011). The utility model discloses a fire-resistant composite cable for smart grid, including a cable core, Filling layer, tape, glass fiber tearing rope, outer sheath, cable core includes multiple conductors and optical fiber units, a fireproof layer is arranged on the outer layer of each conductor, and an insulating layer is arranged outside the fireproof layer. An optical fiber unit is arranged on the outside, a wrapping tape is arranged outside the cable core, and a filling layer is arranged between the wrapping tape and the cable core, and glass fiber ropes are arranged on both sides in the radial direction of the cable, and the glass fiber rope is located on the wrapping tape Between the cable and the outer sheath, although a cable has both the functions of transmitting video images and transmitting digital communications. However, the structure of this cable directly increases the manufacturing cost of the cable; in addition, the cable does not have a shielding layer for anti-interference, which may cause mutual interference with external cables, which will bring serious problems to installation and subsequent application. Many adverse effects.

Utility model content

Aiming at the deficiencies of the above-mentioned prior art, a fire-resistant composite cable capable of transmitting both video images and digital communication coaxial data and control lines is provided. The cable not only has good fireproof performance, but also has a simple and compact structure and Low cost, convenient laying and so on.

The utility model adopts the following technical scheme: a composite fire-resistant cable, the cable includes a cable core, a tape layer and a fire-resistant sheath from the inside to the outside, the tape layer is tightly covered on the cable core, and the fire-resistant sheath The sleeve is sheathed on the tape layer; the cable core is composed of uniformly twisted power lines, control lines and signal transmission lines; the gaps between the twisted cable cores and the gaps between the cable core and the tape layer are filled with flame retardant materials.

In the above technical solution, the power line includes four insulated wire cores evenly wound together and a tape layer tightly wrapped on the four insulated wire cores, and a flame retardant material is filled between the insulated wire cores and the tape layer .

In the above technical solution, a shielding layer is provided around the power line.

In the above technical solution, the control wire includes seven insulated wire cores evenly wound together and a tape layer tightly wrapped on the seven insulated wire cores, and the space between the insulated wire core and the tape layer is filled with Flame retardant material.

In the above technical solution, a shielding layer is provided around the control line.

In the above technical solution, the signal transmission line is a coaxial cable.

In the above technical solution, the number of the cable cores is multiple sets, and the set of cable cores includes a power line, a control line and a signal transmission line.

The utility model has the advantages that the cable of the utility model effectively combines the power cable, the control cable and the coaxial data cable into a whole, which reduces the mutual interference of the magnetic field and the electric field between cables with different functions. It is very convenient and simplifies the engineering construction operation; in addition, the cable with this structure reduces the manufacturing cost of the cable. The utility model not only has superior anti-interference shielding and fire-resistant performance (fire-resistant temperature can reach 1000 ℃), but also has the characteristics of reasonable structure, good flexibility, long service life, safety and reliability, etc., and can fully meet the needs of high-rise buildings, subway tunnels, etc. , power stations and other occasions application requirements.

Description of drawings

The utility model will be described by way of embodiment and with reference to the accompanying drawings, wherein:

Fig. 1 is a sectional view of the utility model;

Fig. 2 is the enlarged sectional view of the power line in the utility model;

Fig. 3 is an enlarged sectional view of the control line in the utility model;

Among them: 1 is the power line, 2 is the control line, 3 is the signal transmission line, 4 is the tape layer, 5 is the fire-resistant sheath, 6 is the flame-retardant material, 7 is the core, 8 is the shielding layer, and 9 is the insulation layer.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, the fire-resistant composite cable described in the utility model includes a cable core, a cladding layer 4, and a fire-resistant sheath 5 from the inside to the outside. The cable core is composed of a power line 1, a control line 2 and a signal transmission line 3 Evenly twisted into a cable; the tape layer 4 tightly wraps the cable core together, and the flame-retardant material 6 is filled between the gaps of the twisted cable core and between the cable core and the tape layer 4, and finally the tape layer 4 is coated with a fire-resistant sheath 5 of ceramic fire prevention.

As shown in Figure 2, it is an enlarged cross-sectional view of the electric power line in the utility model. The electric power line 1 is insulated wire core, tape layer 4 and shielding layer 8 successively from the inside to the outside, and the insulated wire core is tightly covered by the wire core 7 and the wire. The core 7 is composed of an insulating layer 9, and the core 7 is generally composed of several tinned copper wires or copper wires; the flame-retardant material 6 is filled between the insulated core and the wrapping layer 4, and in general, each power line 1 Contains four insulated wire cores, and the four insulated wire cores are evenly wound together; in order to improve the anti-interference performance of the power line 1 during power transmission, a shielding layer 8 is provided outside the tape layer 4 to shield electromagnetic interference.

As shown in Figure 3, it is an enlarged interface diagram of the control line in the present invention. The structure of the control line 2 is the same as that of the power line 1, and it is the insulated core, the tape layer 4 and the shielding layer 8 from the inside to the outside. The insulated wire core is composed of a wire core 7 and an insulating layer 9 closely covering the wire core 7. The wire core 7 is generally composed of several tinned copper wires or copper wires; the insulating wire core and the tape layer 4 are filled with a resistor In general, each control line 2 contains seven insulated wire cores, and the insulated wire cores are evenly wound together; in order to improve the anti-interference performance of the signal during the control signal transmission process, a A layer of shielding layer 8 is used to shield electromagnetic interference.

The tape layer 4, insulating layer 9, flame retardant material 6, wire core 7 and shielding layer 8 described in Fig. 1, Fig. 2 and Fig. 3 are all made of the same material and have the same function.

The signal transmission line adopts traditional coaxial cable, which is composed of inner conductor, insulation layer, outer conductor and sheath layer from inside to outside; the inner conductor is high-quality bare copper wire; the insulation layer is physical foamed polyethylene; the outer conductor is made of The inner longitudinal aluminum foil layer and the outer tinned copper wire braid (also can be replaced by alloy wire braid); the sheath layer is a flexible sheath material.

The utility model is basically set as a group of cable cores, that is, the cable core only includes a power line 1, a control line 2 and a signal transmission line 3. In practical applications, multiple sets of cable cores can be provided according to actual needs. Fire retardant materials are filled between each group of cable cores, and finally the cable cores are molded into cables with a ceramicized fireproof sheath 5 .

In the above process, the insulating layer generally adopts PVC mixture, and any one of TPE mixture, foamed polyethylene, nitrile mixture and rubber-plastic polymer elastic material can also be selected; the flame-retardant material 6 Polypropylene mixed materials are generally used; the fire-resistant sheath is a flame-retardant nitrile-PVC mixture, and a flame-retardant PVC mixture or a flame-retardant elastomer material (such as TPU, TPE, etc.) can also be selected.

All features disclosed in this specification, except mutually exclusive features, can be combined in any way.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A fire-resistant composite cable, characterized in that the cable includes a cable core, a tape layer and a fire-resistant sheath from the inside to the outside, the tape layer is tightly wrapped on the cable core, and the fire-resistant sheath is placed on the On the tape layer; the cable core is composed of power lines, control lines and signal transmission lines uniformly twisted; the gaps between the twisted cable cores and between the cable core and the tape layer are filled with flame-retardant materials. 2. A fire-resistant composite cable according to claim 1, characterized in that the power line includes four insulated wire cores evenly wound together and a tape layer tightly wrapped on the four insulated wire cores, the insulated wire Fire retardant material is filled between the core and the cladding layer. 3. A fire-resistant composite cable according to claim 2, characterized in that a shielding layer is provided around the power line. 4. A fire-resistant composite cable according to claim 1, characterized in that the control wire includes seven insulated wire cores evenly wound together and a tape layer tightly wrapped on the seven insulated wire cores, so Flame retardant material is filled between the insulated wire core and the tape layer. 5. A fire-resistant composite cable according to claim 4, characterized in that a shielding layer is provided around the control line. 6. A fire-resistant composite cable according to claim 1, characterized in that the signal transmission line is a coaxial cable. 7. A fire-resistant composite cable according to claim 1, characterized in that there are multiple sets of said cable cores, and said set of cable cores includes a power line, a control line and a signal transmission line.

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