CN2070493U

CN2070493U - Twisted pair shielding control flexible wire for intrinsic safety

Info

Publication number: CN2070493U
Application number: CN 90207375
Authority: CN
Inventors: 林楼飞; 谢泰嵩; 赵永登
Original assignee: LEQING COUNTY AUTOMATIC INSTRUMENTS FACTORY NO 5
Current assignee: LEQING COUNTY AUTOMATIC INSTRUMENTS FACTORY NO 5
Priority date: 1990-06-27
Filing date: 1990-06-27
Publication date: 1991-01-30

Abstract

A shielding control flexible wire for intrinsic safety needs to be used with an automatic instrument or a distributed control system in an explosion-proof occasion, and is characterized in that a plurality of copper wires are combined together to replace a conventional single-core wire core, a single shielding wire is used, two or three twisted pairs are used as a group, and a plurality of groups are used for carrying out whole-wire shielding.

Description

Intrinsic safety pair twist mask controlling flexible wire

The utility model relates to essential safety used in explosion-proof scene control flexible cord, that is to say a kind of flexible cord that the detecting instrument that is applied to instrument and meter for automation, various control system and explosion-proof scene under the explosion-proof situation of needs is used to its signal liaison net of central control room centralized control system.

At present under explosion-proof environment, use control cable, the independent metal wire of general employing shields, though have shielding properties, but still can produce corresponding interference mutually between heart yearn, anti-electromagnetic interference performance to whole section cable is corresponding relatively poor, because metal wire and heart yearn have all selected for use solid conductor to shield and transmission signals, then rupture easily simultaneously, the flexibility of whole cable still is not ideal enough.

The purpose of this utility model provides that a kind of to have a good antistatic interference and anti-electromagnetic interference and tensile strength good, easy fracture not, and rationally distributed constant makes the inductance of whole flexible cord and electric capacity be reduced to minimum a kind of intrinsic safety pair twist mask controlling flexible wire.

For finishing the technical scheme of being taked of above-mentioned purpose: get 16 on diameter of phi 0.2mm copper wire or 32 and combine the heart yearn that replaces being accustomed to single core, this many composite conducting cores insulate separately, getting two to three conductor wire cores then makes its pair twist become one group, simultaneously conductor wire core group and whole all establishing by draining of forming of many copper cash are disturbed metal wire, and integral body shields again.Be reducing of inductance between the consideration distributed constant and electric capacity, many composite conducting cores are 18～20 strands for every meter, then finish shielding properties and improve antistatic interference and anti-electromagnetic interference optimal parameter, simultaneously because core and drain and disturb these many compound copper wires of platinum line and form, thus whole line soft with easy fracture not.

The utility model embodiment is referred to state in conjunction with the accompanying drawings in detail.

Fig. 1 is the structural representation of the utility model plane of structure;

Fig. 2 is two composite conducting core pair twist structural representations.

According to shown in Figure 1, conductor wire core 1 is made up of 16 or 32 copper wires, and brass wire diameter is good with 0.2mm, and 16 core sectional areas are 0.5mm ², 32 core sectional areas are 1.0mm ²Deng, its outside bag polyethylene or polyvinyl chloride insulation layer 2, form many composite conducting cores, per two or three mutual pair twists of core are that 18～20 strands are for good, as shown in Figure 2 with every meter long, and setting is by the interior filler 3 of oil immersion jute or glass wool yarn, metal wire 5 is disturbed in draining that 16～25 copper wires of the arranged outside of filler 3 are composited, by glass fiber be liner 4 with its parcel, the outside establishes aluminium platinum or copper mesh screen 6 respectively and inner sheath 7 is formed the conductor wire core groups.The aluminum foil thickness of above-mentioned foil shielding layer 6 is best with 0.022mm.

Whole flexible cord can be made up of 2 groups, 4 groups, 6 groups, 12 groups, 24 groups, 36 groups conductor wire cores, between the conductor wire core group, put filler 8 between group, the outside is established to drain between the group that many copper wires form and is disturbed metal wire 10, above-mentioned many copper wires are generally with between 16～25, diameter is that 0.8mm is good, drain between group disturb between the metal wire 10 respectively with the glass fiber group between liner 9 and aluminium foil or copper mesh shielding 11 parcels, oversheath 12 between outermost side group.

The composite conducting core is used orange-Bai respectively in the group,, green-Hei, red-ash, sky blue-brown mutual pairing distinguished.Oversheath is the blue look of international standard.

The utility model can be widely used in the continuous lines that instrument in the intrinsic safety system is done the hazardous area, also can be used for single loop control system and make the on-the-spot connecting line of zena's safety barrier, the intrinsically-safe instrument and the guard grating that can be equally in various DDZs and the Distributed Control System are made distribution.

Claims

1 one kinds of explosion-proof on-the-spot intrinsic safety pair twist mask controlling flexible wires that use, by conductor wire core, insulating barrier, filler, liner, drain and disturb the platinum line, screen and sheath are formed, it is characterized in that a) conductor wire core 1 is made up of 16 or 32 copper wires, outsourcing insulation 2, form many composite conducting cores, two or three mutual pair twists of core, and filler 3 in being provided with, metal wire 5 is disturbed in draining that 16 copper wires of the arranged outside of filler 3 are composited, filler 3 and draining disturb between the metal wire 5 by glass fiber be liner 4 with its parcel, its outside is established aluminium foil or copper mesh screen 6 and inner sheath 7 respectively and is formed the conductor wire core groups; B) put filler 8 between group between the conductor wire core group, the outside is established to drain between the group that many copper wires form and is disturbed metal wire 10, and front and back are respectively with liner 9 and aluminium foil or copper mesh screen 11 between the glass fiber group, oversheath 12 between outermost side group are set.

2 intrinsic safety according to claim 1 pair twist mask controlling flexible wires is characterized in that many composite conducting cores two or three mutual pair twists, and its every meter long is that 18～20 strands are for good.

3 intrinsic safety according to claim 1 pair twist mask controlling flexible wires is characterized in that aluminum foil thickness is good with 0.022mm.