CN201562473U - A flexible inorganic insulated fireproof cable with an insulating moisture-proof layer - Google Patents

Abstract

Disclosed is a flexible inorganic insulated fireproof cable with insulated damp-proof layer, which is characterized in that the cable comprises a plurality of cable cores orderly coated with an insulated layer, an insulated damp-proof layer (3) and a conductor (1) weaving or winding a reinforced layer (4) from inside to outside; an insulated lining (6) and a metallic sheath layer (7) orderly coated outside the cable cores; and a filler (5) composed of an inorganic filling rope filled in the interval between the insulated lining (6) and the cable cores.

Description

A flexible inorganic insulated fireproof cable with an insulating moisture-proof layer

technical field

The utility model patent relates to a cable, in particular to a flexible inorganic insulated fireproof cable with an insulating moisture-proof layer.

Background technique

Traditional mineral insulated cables are insulated with magnesium oxide powder, which has excellent fire resistance, explosion-proof, high temperature resistance, corrosion resistance and other properties, and is mainly suitable for fire protection systems, fire hazard areas, high temperature occasions and important and critical places. Ensure that the power supply line can supply power within a certain period of time in case of fire, which is convenient for the evacuation of personnel and important materials. However, the manufacturing process of the cable is cumbersome and the equipment investment is large. The length of cable manufacturing is limited, such as long-distance laying, it is necessary to add intermediate joints. The increase of intermediate joints will inevitably increase the possibility of product air leakage. Magnesium oxide powder is easy to absorb moisture. After absorbing moisture, the insulation resistance of the cable at the joint will decrease, which will affect the electrical performance. In addition, the bending performance of the cable is poor, the installation and laying are inconvenient, and the scope of use is limited to a certain extent. Due to the complex manufacturing process, high energy consumption and low product yield, the cable price is high, which is not convenient for popularization and use of the product.

Contents of the invention

The purpose of this utility model is to provide a flexible inorganic insulated fireproof cable with an insulating and moisture-proof layer for the shortcomings of the above-mentioned prior art.

The flexible inorganic insulated fireproof cable with insulation and moisture-proof layer of the utility model comprises a plurality of cable cores composed of conductors which are sequentially wrapped with insulation layer, insulation and moisture-proof layer, braided or wrapped reinforcement layer from inside to outside, and wrapped in the cable core in turn. The outer heat insulation lining layer and the metal sheath layer are filled with filling materials composed of inorganic filling ropes in the heat insulation lining layer and the gap between the cable cores.

According to actual needs, the utility model can be wrapped with an outer sheath layer made of any one of halogen-free low-smoke flame-retardant plastic, polyvinyl chloride or anti-corrosion coating outside the metal sheath layer.

The conductor described in the utility model is made of a solid copper conductor or a multi-strand tightly pressed and stranded copper conductor, and its cross-sectional shape is a circular or fan-shaped structure. This structure is easy to process, the manufacturing length is not limited, and it has a certain degree of softness and flexibility when used, which is convenient for laying.

The insulating layer described in the utility model is formed by wrapping multilayer inorganic fiber tapes; in order to increase the mechanical strength of the insulating layer, the braided or wrapped reinforcing layer is formed by wrapping inorganic fiber weaving or glass silk cloth tapes, This structure can also play a role of tightness and heat insulation.

The inorganic filler rope filler described in the utility model can prevent the intrusion of moisture.

The metal sheath described in the utility model is made of copper or stainless steel, and the corrugated or non-corrugated structure can be selected according to the usage.

Compared with the prior art, the beneficial effects of the utility model are as follows:

(1) Good softness

The conductor and the metal sheath are designed with a soft structure. Compared with the pull-type fireproof cable, the manufacturing length is longer, the processing cycle is shorter, and the process is less; there are fewer intermediate joints, and the installation is convenient, which can effectively reduce the failure rate.

(2) Excellent fire performance

Since the components of the cable are all inorganic materials, the non-combustibility of the cable itself is determined. The product conforms to BS and IEC standards, can withstand 950°C, 3-hour burning test (including spraying, mechanical shock) under electrified conditions, and guarantees the normal operation of the circuit.

(3) High temperature resistance grade and large transmission capacity.

There is no possibility of thermal aging of the insulating material, and it can be operated at 500°C for a short time and at 300°C for a long time. Compared with ordinary cables with the same cross-section, this product can not only transmit higher current but also withstand greater overload.

(4) Good moisture-proof effect

A moisture-proof layer is added outside the insulation, and the metal sheath has a good sealing effect, even if the cable is not powered for a long time, the insulation level will not be reduced.

(5) With anti-corrosion function

In the case of severe chemical corrosion, the stainless steel sleeve can be used to achieve anti-corrosion effect. Add anti-corrosion coating according to user needs.

(6) shielding

The metal sheath has a good shielding effect, which can eliminate electromagnetic pollution to the surrounding environment.

(7) Halogen-free, low smoke, flame retardant

The cables are insulated with non-combustible inorganic substances, and sheathed with halogen-free, low-smoke, flame-retardant polyolefin. The smoke density test is carried out according to IEC 61034, and the minimum light transmittance is above 60%.

(8) Good mechanical properties

It can withstand strong mechanical external forces such as drawing, extrusion, impact, and twisting.

Description of drawings

Accompanying drawing is the structural diagram of the utility model.

Detailed ways

The utility model will be further described below in conjunction with embodiment (accompanying drawing):

As shown in the figure, the flexible inorganic insulated fireproof cable with insulation and moisture-proof layer of the present invention includes a plurality of cables composed of conductors 1 wrapped with insulation layer 2, insulation and moisture-proof layer 3, and braided or wrapped reinforcement layer 4 in sequence from inside to outside. The wire core is wrapped in the heat insulation lining layer 6 and the metal sheath layer 7 outside the cable core in turn, and the gap between the heat insulation lining layer 6 and the cable cores is filled with a filler material 5 composed of an inorganic filler rope.

In the utility model, an outer sheath layer 8 made of any one of halogen-free low-smoke flame-retardant plastics, polyvinyl chloride or anti-corrosion coating can be wrapped outside the metal sheath layer according to actual needs.

The conductor 1 described in the utility model is made of a solid copper conductor or a multi-strand tightly pressed and twisted copper conductor, and its cross-sectional shape is a circular or fan-shaped structure. This structure is easy to process, the manufacturing length is not limited, and it has a certain degree of softness and flexibility when used, which is convenient for laying.

The insulation layer 2 described in the utility model is formed by wrapping with multi-layer inorganic fiber tape; in order to increase the mechanical strength of the insulation layer, the braided or wrapped reinforcement layer 4 is wrapped by inorganic fiber weaving or glass silk cloth tape. As a result, this structure can also play a role of tightness and heat insulation.

The metal sheath 7 described in the utility model is made of copper or stainless steel, and the corrugated or non-corrugated structure can be selected according to the usage.

Claims (4)

1. flexible inorganic insulation fireproof cable with insulation and moisture layer, it is characterized in that: described cable comprises the many cable cores that are enclosed with conductor (1) composition of insulating barrier (2), insulation and moisture layer (3), braiding or wrapped enhancement layer (4) from the inside to the outside successively, be wrapped in cable core outer insulation lining (6) and metal sheath layer (7) successively, be filled with the packing material (5) that adopts inorganic gasket for packing to constitute in insulation lining (6) and in the gap between cable core.

2. the flexible inorganic insulation fireproof cable with insulation and moisture layer according to claim 1 is characterized in that: be wrapped with the external sheath layer that adopts any one material in LSOH anti-flaming plastics, polyvinyl chloride or the corrosion-inhibiting coating at metal sheath layer.

3. the flexible inorganic insulation fireproof cable with insulation and moisture layer according to claim 1 is characterized in that: described conductor (1) adopts real core copper conductor or multiply to press twisted copper conductors and makes, and its cross sectional shape is circle or sector structure.

4. the flexible inorganic insulation fireproof cable with insulation and moisture layer according to claim 1 is characterized in that: described insulating barrier (2) adopts wrapped the forming of multilayer inorfil band; Described braiding or wrapped enhancement layer (4) employing inorfil weave or the glass fiber strap is wrapped forms.

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