CN104751986A

CN104751986A - Motor shielding cable for intrinsically safe circuit

Info

Publication number: CN104751986A
Application number: CN201510089290.6A
Authority: CN
Inventors: 唐前进
Original assignee: NHUI CONSTANT CRYSTAL CABLE GROUP CO Ltd
Current assignee: NHUI CONSTANT CRYSTAL CABLE GROUP CO Ltd
Priority date: 2015-02-27
Filing date: 2015-02-27
Publication date: 2015-07-01

Abstract

The invention discloses a motor shielding cable for an intrinsically safe circuit. The motor shielding cable comprises two groups of control cable cores, two metal hoses, two drainage wires and five outer protective layers. The five outer protective layers orderly refer to a polyethylene insulating layer, a copper strip shielding layer, a silver-coated copper wire shielding layer, a non-magnetic metal armor layer and a low-smoke halogen-free polyolefin sheath layer from inside to outside; the two groups of cable cores are extruded inside the polyethylene insulating layer, and twenty-two silver-coated annealed aluminum alloy conductors are extruded inside each group; the two metal hoses are extruded inside the polyethylene insulating layer and in the gap between the two groups of control cable cores; the two silver-coated nickel drainage wires are extruded between the polyethylene insulating layer and the copper strip shielding layer. The cable has excellent shielding properties, has the characteristics of low capacitance, low inductance and strong anti-interference property, and is not easy to bend and suitable for the fields of aerospace and the like.

Description

A kind of essential safety circuit machine shielded type cable

Technical field

The invention belongs to field of cables, particularly relate to a kind of essential safety circuit machine shielded type cable.

Background technology

Cable has electric conductivity, be widely used in each different field, relating to people's lives, industrial production every field, so the consumption of cable is huge especially, is also important especially, also can be more and more higher to the requirement of quality, but in every field and each area, the quality purposes of cable is required it is different, as in fields such as space flight and aviation, cable is had to the requirement of low electric capacity, low inductance, could be durable in use, satisfy the demand.

Summary of the invention

In order to increase the practicality of prior art, the object of this invention is to provide the essential safety circuit machine shielded type cable of strong, the low electric capacity of a kind of shielding properties, low inductance and strong interference immunity.

The present invention takes following technical scheme to realize: a kind of essential safety circuit machine shielded type cable, it comprises two groups and controls cable core, two metal hoses, two drainage threads and five layers of external protection, five layers of external protection are followed successively by polyvinyl chloride insulation layer from inside to outside, copper strip shielding layer, silver-gilt copper wire screen, nonmagnetic metal armour and low-smoke halogen-free polyolefin restrictive coating, polyvinyl chloride insulation layer is set to the central core of cable, two groups control cable core and are extruded in polyvinyl chloride insulation layer inside, the often inner three layers of restrictive coating extruding 22 silver-plated annealed Al-alloy conductors and be wrapped in outside 22 silver-plated annealed Al-alloy conductors of group, three layers of restrictive coating are followed successively by zinc-plated nickel strap screen from inside to outside, layer of polyester fiber and perfluoroethylene-propylene insulating barrier, the inside of described polyvinyl chloride insulation layer, two groups of gaps controlled between cable core extrude two zinc-aluminium-alloy metal hoses, two silver plated nickel wire drainage threads are extruded between described polyvinyl chloride insulation layer and copper strip shielding layer.

The cross-sectional diameter length of described zinc-aluminium-alloy metal hose is 0.8 ㎜, and the cross-sectional diameter length of silver plated nickel wire drainage thread is 0.6 ㎜.

The present invention has following beneficial effect in sum: this kind of cable has excellent shielding properties, has the feature of low electric capacity, low inductance and strong interference immunity, and not flexible, is applicable to being applied to the fields such as Aero-Space.

Accompanying drawing explanation

Fig. 1 is cross-sectional structure schematic diagram of the present invention.

Embodiment

As shown in Figure 1, a kind of essential safety circuit machine shielded type cable, it comprises two groups and controls cable core 1, two metal hoses, two drainage threads and five layers of external protection, five layers of external protection are followed successively by polyvinyl chloride insulation layer 4 from inside to outside, copper strip shielding layer 5, silver-gilt copper wire screen 6, nonmagnetic metal armour 7 and low-smoke halogen-free polyolefin restrictive coating 8, polyvinyl chloride insulation layer 4 is set to the central core of cable, two groups control cable core 1 and are extruded in polyvinyl chloride insulation layer 4 inside, the often inner three layers of restrictive coating extruding 22 silver-plated annealed Al-alloy conductors 11 and be wrapped in outside 22 silver-plated annealed Al-alloy conductors 11 of group, three layers of restrictive coating are followed successively by zinc-plated nickel strap screen 12 from inside to outside, layer of polyester fiber 13 and perfluoroethylene-propylene insulating barrier 14, the inside of described polyvinyl chloride insulation layer 4, two groups of gaps controlled between cable core 1 extrude two zinc-aluminium-alloy metal hoses 2, two silver plated nickel wire drainage threads 3 are extruded between described polyvinyl chloride insulation layer 4 and copper strip shielding layer 5.

Embodiment: the cross-sectional diameter length of described zinc-aluminium-alloy metal hose 2 is 0.8 ㎜, the cross-sectional diameter length of silver plated nickel wire drainage thread 3 is 0.6 ㎜.

Outer wrapping one deck copper strip shielding layer 5 of described polyvinyl chloride insulation layer 4, outer wrapping one deck silver-gilt copper wire screen 6 of described copper strip shielding layer 5, outer wrapping one deck nonmagnetic metal armour 7 of described silver-gilt copper wire screen 6, outer wrapping one deck low-smoke halogen-free polyolefin restrictive coating 8 of described nonmagnetic metal armour 7.

Further, outer wrapping one deck layer of polyester fiber 13 of described zinc-plated nickel strap screen 12, outer wrapping one deck perfluoroethylene-propylene insulating barrier 14 of described layer of polyester fiber 13.

This cable allows operational environment maximum temperature to be 95 DEG C, and the minimum temperature of mounting and installation is-20 DEG C; Can stand to exchange 50HZ, 3.5Kv/5min voltage and not breakdown; The shielding rejection coefficient of this cable is less than 0.7.

The above is the embodiment of the present invention, therefore all equivalences done according to structure, feature and the principle described in the present patent application scope change or modify, and are included in patent claim of the present invention.

Claims

1. an essential safety circuit machine shielded type cable, it comprises two groups and controls cable core, two metal hoses, two drainage threads and five layers of external protection, it is characterized in that: five layers of external protection are followed successively by polyvinyl chloride insulation layer from inside to outside, copper strip shielding layer, silver-gilt copper wire screen, nonmagnetic metal armour and low-smoke halogen-free polyolefin restrictive coating, polyvinyl chloride insulation layer is set to the central core of cable, two groups control cable core and are extruded in polyvinyl chloride insulation layer inside, the often inner three layers of restrictive coating extruding 22 silver-plated annealed Al-alloy conductors and be wrapped in outside 22 silver-plated annealed Al-alloy conductors of group, three layers of restrictive coating are followed successively by zinc-plated nickel strap screen from inside to outside, layer of polyester fiber and perfluoroethylene-propylene insulating barrier, the inside of described polyvinyl chloride insulation layer, two groups of gaps controlled between cable core extrude two zinc-aluminium-alloy metal hoses, two silver plated nickel wire drainage threads are extruded between described polyvinyl chloride insulation layer and copper strip shielding layer.

2. essential safety circuit machine shielded type cable according to claim 1, is characterized in that: the cross-sectional diameter length of described zinc-aluminium-alloy metal hose is 0.8 ㎜, and the cross-sectional diameter length of silver plated nickel wire drainage thread is 0.6 ㎜.