CN202720964U - An explosion-proof telephone cable for nuclear island - Google Patents

Abstract

The utility model discloses an anti-explosion telephone cable for a nuclear island. The anti-explosion telephone cable comprises a cable core which is formed by concentrically stranding a plurality of unit groups, wherein a shielding layer wraps the cable core; an inner sheath is extruded outside the shielding layer; an armor layer is wound on the inner sheath; an outer sheath is extruded on the outermost layer; each unit group is combined by two insulation wire cores which are pair twisted; and each insulation wire core consists of a conductor and an insulation layer extruded outside the conductor. The anti-explosion telephone cable has radiation resistance and a good shielding effect, can be used in anti-explosion occasions and can meet requirements of nuclear power construction and operation.

Description

An explosion-proof telephone cable for nuclear island

technical field

The utility model belongs to the field of power cables, in particular to an explosion-proof telephone cable for nuclear islands.

Background technique

With the sustained and rapid development of my country's economy, after all, the rapid growth of energy is required; and the development of nuclear energy is one of the important ways to solve my country's energy shortage, improve energy structure, control environmental pollution, and ensure energy structure. Nuclear power construction requires a large number of cables, and the special nuclear power environment requires that the cables themselves have higher requirements than ordinary cables; the communication system plays a pivotal role in the construction and operation of nuclear power, and the current telephone cables do not have radiation resistance requirements , poor shielding effect, not suitable for use in explosion-proof occasions and other defects, it can no longer meet the requirements of nuclear power construction and operation.

Utility model content

The technical problem to be solved by the utility model is to provide an explosion-proof telephone cable for nuclear islands with flame retardancy, anti-interference, radiation resistance and good shielding effect.

An explosion-proof telephone cable for a nuclear island described in the utility model includes a cable core, a shielding layer is coated on the outside of the cable core, an inner sheath is extruded outside the shielding layer, an armored layer is wound outside the inner sheath, and the outermost The outer sheath is extruded in layers; the cable core is formed by concentric twisting of several unit groups.

The unit group is formed by twisting two insulated wire cores; the insulated wire core is composed of a conductor and an insulating layer extruded outside the conductor.

The insulating layer adopts the extruded structure of radiation cross-linked polyolefin.

The shielding layer adopts the structure of braiding tinned copper wire after wrapping Mylar aluminum foil.

The armor layer adopts a double-layer steel strip gap covering and wrapping structure.

The beneficial effects of the utility model are:

1. The utility model adopts radiation cross-linked polyolefin insulation material, which is extruded and then irradiated with high-energy electron beams to improve insulation heat resistance and radiation resistance.

2. The insulated wire cores in this utility model are combined by twisted pairs, and the pitch is uniform and controlled within 40mm. The pitch between different units is different, and can be adjusted by 5mm to meet the requirements of low capacitance and low inductance, and at the same time reduce the distance between wire pairs. Electromagnetic coupling improves the anti-interference ability between wire pairs and meets the requirements of explosion-proof occasions.

3. The shielding layer of the utility model is wrapped with Mylar aluminum foil and then braided with tinned copper wire. The braiding density is not less than 90%, which greatly improves the anti-interference ability of the cable and ensures the stability of communication.

4. The utility model adopts double-layer steel strip gaps to cover and wrap to form the armor layer of the cable, which prevents external mechanical damage and improves the service life of the cable.

5. The utility model adopts a 125°C halogen-free low-smoke flame-retardant irradiation cross-linked polyolefin sheath, which solves the problem that the halogen-free flame-retardant sheath is easy to crack.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways:

As shown in Figure 1, an explosion-proof telephone cable for a nuclear island described in the utility model includes a cable core, which is coated with Mylar aluminum foil + tinned copper wire braided shielding layer 3 outside the cable core, and extruded outside the shielding layer 3 It is wrapped with a thermoplastic low-smoke, halogen-free, flame-retardant inner sheath 4, an armor layer 5 is wrapped around the inner sheath 4, and the outermost layer is extruded with a 125°C low-smoke, halogen-free, flame-retardant, radiation cross-linked polyolefin outer sheath 6; The cable core is formed by concentric twisting of several unit groups 7; the unit group 7 is formed by twisting two insulated wire cores; The insulating layer 2 constitutes.

The utility model provides a form and implementation method of a low-voltage cable with concentric conductors. The above description is only a preferred implementation method of the utility model. Under the premise of the novel principle, some improvements can also be made, and these improvements should also be regarded as the protection scope of the present utility model.

Claims (5)

1. a nuclear island anti-explosion telephone cable comprises cable core, at cable core outer cladding screen (3), extrudes inner sheath (4) outside screen (3), twines armour (5) outside inner sheath (4), and outermost layer extrudes oversheath (6); It is characterized in that: described cable core is by stranded the forming of several unit group (7) concentric types.

2. nuclear island according to claim 1 anti-explosion telephone cable is characterized in that: described unit group (7) is thoroughly done away with edge core pair twists by two and is combined; Its insulated wire cores is by conductor (1) and be extruded in outer insulating barrier (2) formation of conductor (1).

3. nuclear island according to claim 1 and 2 anti-explosion telephone cable is characterized in that: described insulating barrier (2) employing cross-linking radiation polyolefin extrusion structure.

4. nuclear island according to claim 1 anti-explosion telephone cable is characterized in that: described screen (3) adopts wrapped wheat to draw aluminium foil to weave the tinned copper wire structure again.

5. nuclear island according to claim 1 anti-explosion telephone cable is characterized in that: described armour (5) adopts the clad steel band gap to put up lapping structure.