CN204215791U - With the multicore flame resistant cable of sheath band wire core - Google Patents

Abstract

The utility model provides a multi-core flame-retardant fire-resistant cable with a sheath and a ground core, which includes a circular ground core and a circular conductor. The circular conductor is extruded with a corrugated insulating layer to form a wire Core, the stranded circular ground core is twisted with multiple corrugated cores to form a circular cable core, and an outer sheath is extruded outside the cable core. The power line core of the utility model has a corrugated structure, and the structure between the ground line core and the ground line core is compact. The production cost is reduced, and the flame-retardant and fire-resistant properties are reliable. The conductor adopts a circular compact structure, which is less difficult to process and will not damage the insulating layer. According to different usage occasions, a protective layer is provided, which can be used in various harsh occasions.

Description

Multi-core flame-retardant fire-resistant cable with sheath and ground core

technical field

The utility model relates to the field of power cables, in particular to a multi-core flame-retardant and fire-resistant cable with a sheath and a ground core.

Background technique

With the frequent occurrence of fire accidents, people's awareness of the fire hazards of wires and cables continues to deepen, and the relevant departments have higher and higher requirements for the performance of wires and cables such as fire resistance and flame retardancy. Because the cable fire has the characteristics of rapid spread, difficulty in fighting, secondary hazards, and long recovery time, it will bring huge losses to the national economy and the lives and properties of the people. Therefore, people put forward more stringent operating conditions for the flame retardant, fireproof characteristics, safety and reliability of wires and cables. Such as fireproof, explosion-proof, strong overload capacity, long service life, under fire conditions, fire elevators, fire pumps need to maintain normal operation for a certain period of time, after burning, the cables are low-smoke, low-halogen, low-toxic, and even smoke-free, halogen-free and non-toxic and other special requirements. Cable flame retardant and fire prevention measures are important means to reduce cable fire and flame delay. The key is to focus on prevention. Various types of flame retardant cables, fire-resistant cables, and fire-resistant cables are widely used.

For any substance to burn, the following three conditions must be met: combustibles, oxidant, and temperature (ignition source). Oxygen contained in the air is an oxidant. Therefore, in the design of the cable structure, it is a common method to reduce the gap between the cables to reduce the existence of air. Therefore, the existing technology is often used between the structures of the cables. The method of setting flame-retardant or refractory materials such as glass fiber rope, glass fiber tape, mica tape, asbestos rope, etc., can improve the flame-retardant and fire-resistant performance of the cable. In this method, the use of a large number of flame-retardant or refractory materials will increase production costs, and the second is that the performance of flame-retardant or refractory materials is unreliable or harmful to the human body. In order to reduce the gap between the wire cores, corrugated conductors are often used in the prior art, and the corrugated wire cores are extruded and insulated to form a cable, which can minimize the gap between the wire cores, but the distance between the wire cores and the sheath Gaps still exist. In particular, there are many problems and disadvantages in the processing of corrugated conductors in the production process: First, the process is difficult. In order to meet the sufficient flexibility and stability of corrugated conductors, the design of conductor structures, tooling molds, and equipment characteristics are required. The second is that in order to prevent moisture from infiltrating, the conductor must use a compact conductor to increase the filling factor of the conductor, reduce the outer diameter, and reduce the gap between the conductors. The corrugated conductor is corrugated and compact, and the shape of each layer is different. The difficulty of compacting increases; the third is that it is easy to cause electric field concentration and damage the cable insulation layer during the processing of each corner of the corrugated conductor.

Utility model content

In order to solve the problems of the prior art, the utility model provides a multi-core flame-retardant and fire-resistant cable with a ground core, which is compact in structure, low in cost, low in process difficulty, good in flame retardancy and fire resistance, and suitable for various harsh occasions.

The utility model comprises a circular ground core and a circular conductor, the circular conductor is extruded with a corrugated insulating layer to form a core, and the twisted circular ground core is twisted with multiple corrugated cores A circular cable core is formed, and an outer sheath is extruded outside the cable core.

There is preferably a tie-up layer between the cable core and the outer sheath, and the tie-up layer can be wrapping, longitudinal wrapping, braiding or extruding, and a kind of flame-retardant braiding layer is preferably braided. The material is further improved and the braided layer is coated with a flame-retardant and refractory coating.

The circular ground core can be a bare conductor structure or a composite layer extruded with a circular insulating sheath.

The circular conductor is preferably a compressed circular conductor, and the compressed circular conductor is further improved to be a compressed circular shaped wire conductor.

The extruded corrugated insulating layer can be extruded or extruded tube, one is preferably extruded.

The outer sheath can be provided with one or more layers, such as an armor layer, a shielding layer, etc., according to different application occasions, and each layer of a better outer sheath adopts a common structure of a flame-retardant and fire-resistant cable.

The beneficial effect of the utility model is that: the power line core has a corrugated structure, the structure between the ground line core and the ground line core is compact, the gap between the line cores is small, and there is no need to use glass fiber ropes, glass fiber tapes, mica tapes, asbestos ropes, etc. Or refractory materials, which reduce production costs, and have reliable flame-retardant and fire-resistant properties. The conductor adopts a circular compact structure, which is less difficult to process and will not damage the insulating layer. According to different usage occasions, a protective layer is provided, which can be used in various harsh occasions.

Description of drawings

Figure 1 is a schematic diagram of the structure of a three-core cable.

Figure 2 is a schematic diagram of the structure of a four-core cable.

Figure 3 is a schematic diagram of the structure of a five-core cable.

Detailed ways

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

The utility model includes a circular ground wire core 1 and a circular conductor 3. The circular conductor 3 is extruded with a corrugated insulating layer 4 to form a wire core. The structure of a three-wire-core cable is shown in Figure 1. The four-wire core The cable structure is shown in Figure 2, and the five-core cable structure is shown in Figure 3. The circular ground core 1 is twisted with multiple corrugated cores to form a circular cable core, and an outer sheath 5 is extruded outside the cable core.

There is preferably a tight layer between the cable core and the outer sheath 5, and the tight layer can be wrapped, longitudinally wrapped, braided or extruded, and a kind of resistance is preferably braided. Combustible materials, further improved on the braided layer coated with flame-retardant refractory coating.

The circular ground core 1 can be a bare conductor structure or a composite layer extruded with a circular insulating sheath 2 .

One of the circular conductors 3 is preferably a compressed circular conductor, and the compressed circular conductor is further improved to be a compressed circular shaped wire conductor.

The extruded corrugated insulating layer 4 can be extruded or extruded tube, one is preferably extruded.

The outer sheath 5 can be provided with one or more layers, such as armoring layer, shielding layer, etc., according to different application occasions. Each layer of a better outer sheath adopts a common structure of flame-retardant and fire-resistant cables.

There are many specific application ways of the utility model, and the above descriptions are only the preferred implementation modes of the utility model. Improvements, these improvements should also be regarded as the protection scope of the present utility model.

Claims (6)

1. A multi-core flame-retardant and fire-resistant cable with a sheath and a ground core, including a circular ground core (1) and a circular conductor (3), characterized in that: the outer surface of the circular conductor (3) A corrugated insulation layer (4) is extruded to form a wire core, and a circular ground wire core (1) is twisted with multiple corrugated wire cores to form a circular cable core, and an outer sheath (5) is extruded outside the cable core ). 2. The multi-core flame-retardant and fire-resistant cable with a sheath and a ground core according to claim 1, characterized in that: a tightening layer is provided between the cable core and the outer sheath (4). 3. The multi-core flame-retardant and fire-resistant cable with sheath and ground core according to claim 1, characterized in that: the circular conductor (3) is a compacted circular conductor or a compacted circular shaped wire conductor. 4. The multi-core flame-retardant and fire-resistant cable with sheath and ground core according to claim 1, characterized in that: the circular ground core (1) is a bare conductor structure or extruded with circular insulation Composite layer of sheath (2). 5. The multi-core flame-retardant and fire-resistant cable with sheath and ground core according to claim 1, characterized in that: the corrugated insulating layer (4) is extruded or extruded tube. 6. The multi-core flame-retardant and fire-resistant cable with a sheath and a ground core according to claim 1, characterized in that: said outer sheath (5) has a one-layer or multi-layer structure.