CN2067451U

CN2067451U - Control cable for explosive environment

Info

Publication number: CN2067451U
Application number: CN 90207376
Authority: CN
Inventors: 王松田; 陈少明
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-06-27
Filing date: 1990-06-27
Publication date: 1990-12-12

Abstract

Disclosed is a control cable for an explosive environment, which is matched with electrical equipment, a meter, etc. The utility model is characterized in that 2-3 core threads are respectively hinged for forming a plurality of shielded assemblies which are totally shielded. Because the internal structure of the utility model is provided with few clearances, air is not easily to flow. Aiming at an overall structure, the utility model reduce the mutual interference among the core threads to the minimum degree for improving the electrical interference resistance performance of entire the control cable for an explosive environment and limiting the additional energy storage caused in a transmission signal.

Description

Control cable for explosive environment

The utility model relates to the distribution in the explosion-proof electrification, specifically under the explosive atmosphere situation with matching used control cable such as electric equipment, instrument.

At present both at home and abroad for electric equipment or instrument are normally used at dangerous situation, when making electrical apparatus for explosive atmospheres in succession, designed and be suitable for matching used insulated cable in the explosive atmosphere, thereby made electric integrated explosion proof system.Domestic input intrinsically safe circuit cable adopts many cores always to shield, and can produce corresponding interference mutually between its shortcoming core, and is corresponding relatively poor to the anti-electrical interference performance of whole cable.

It is few that the purpose of this utility model provides a kind of internal structure space, gas is difficult for circulation, interfere with each other minimum between core, improve the anti-electrical interference performance of whole cable, and caused additional energy storage limits in transmission signal process, simultaneously insulated wire cores is adopted color separation sign, a kind of explosive atmosphere control cable easy to use.

For finishing the technical scheme that above-mentioned purpose is taked: take 2～3 cores some shielding groups of stranded formation respectively, some shielding groups are totally shielded, it is few that its internal structure meets the space, gas is difficult for circulation, reach explosion-proof code requirement, every shielding group all is provided with the winding ground wire, and the inductance between the distributed constant and electric capacity is reduced to minimum, and caused additional energy storage limits in transmission signal process.In addition core is twisted adopting the color separation sign, sheath adopts international distinguishing mark, is blue look as the present invention with compensating wire (cable), and the explosion-proof electrification distribution is a sky-blue, Strengthens Safety Management, and is convenient to construction and maintenance.Finish to interfere with each other between core reducing to minimum from overall plan, improve the anti-electrical interference performance of whole cable and additional energy storage is limited.

The utility model embodiment is described in detail in conjunction with the accompanying drawings.

Fig. 1 is the control cable cross section structure schematic diagram of two core groups;

Fig. 2 is the structural representation of two core groups;

Fig. 3 is the control cable cross section structure schematic diagram of three core groups;

Fig. 4 is the structural representation of three core groups.

According to Fig. 2 and shown in Figure 4,1 two or three in every line taking core is a group, and its stranded spacing should be not more than 100mm, and the direction of lay right-to-left is the some shielding groups of stranded formation respectively.This screening component fills 3 in putting between the insulating barrier 2, peripheral hardware group liner 4 not by conductive core line 1 outsourcing insulation 2, winding ground wire 5 is established in the outside of group liner 4, and it is wrapped that set of shield layer 6 is set, the wrapped right-to-left of screen, Duplication is 25～45% of a bandwidth, 45% to be good, and must not crack.Above-mentioned outermost is established group sheath 7, stranded composition conductive core line group.Determine conductive core line group number totally to shield as required and finish this control cable,, put outer filling 8 between the conductive core line group according to Fig. 1 and shown in Figure 3, peripheral hardware liner 9, earth connection 10 is established in its outside, and screen 11 is set, outermost is established sheath 12, forms many set of shield structure.

The utility model can be used for the connecting line that package system 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 BARD, can make distribution usefulness with intrinsically-safe instrument and guard grating in various DDZs and the Distributed Control System equally.

Claims

1, a kind of explosive atmosphere control cable of forming by conductive core line, insulating barrier, filling, liner, earth connection, screen, sheath, it is characterized in that: a, adopt two or three conductive core line 1 outsourcing insulations 2, stranded mutually, fill 3 in putting between the insulating barrier 2, peripheral hardware group liner 4, winding ground wire 5 is established in its outside, and it is wrapped that set of shield layer 6 is set, and above-mentioned outermost is established group sheath 7 stranded composition conductive core line groups; B puts outer filling 8 between the conductive core line group, peripheral hardware liner 9, and earth connection 10 is established in its outside, and screen 11 is set, and outermost is established sheath 12, forms many set of shield structure.

2, explosive atmosphere control cable according to claim 1 is characterized in that the stranded mutually of core 1, and its stranded spacing should be not more than 100mm, and direction of lay is from right-to-left.

3, explosive atmosphere control cable according to claim 1 is characterized in that the wrapped right-to-left of screen 6, and Duplication is 25～45% of a bandwidth, is good with 45%.