CN101901642A - Intrinsic safety system instrument cable - Google Patents
Intrinsic safety system instrument cable Download PDFInfo
- Publication number
- CN101901642A CN101901642A CN 201010232626 CN201010232626A CN101901642A CN 101901642 A CN101901642 A CN 101901642A CN 201010232626 CN201010232626 CN 201010232626 CN 201010232626 A CN201010232626 A CN 201010232626A CN 101901642 A CN101901642 A CN 101901642A
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- cable
- twisted pair
- safety system
- intrinsic safety
- pair wire
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Abstract
The invention discloses an intrinsic safety system instrument cable belonging to safety cables. The intrinsic safety system instrument cable comprises a plurality of cable cores, a branch shielding layer, packing materials, a wrapping layer, a total shielding layer and a jacket, wherein the cable cores are arrayed along a length direction, each cable core comprises a twisted pair wire which consists of two insulated conductors twisted into a spiral shape along the length direction, and an isolated layer which separates the twisted pair wire from other twisted pair wires and has color difference is wrapped on the surface of each twisted pair wire; the branch shielding layer covers the surface of the isolated layer, and the packing materials are packed between the isolated layers and the twisted pair wires; the wrapping layer which bundles all the cable cores together is positioned outside the cable cores, and the total shielding layer covers the surface of the wrapping layer; the surface of the total shielding layer is provided with the jacket; and the packing materials are packed between the wrapping layer and the cable cores. The intrinsic safety system instrument cable has low capacitance and inductance, good shielding property and anti-interference property and is superior to a general control cable and a computer cable in the anti-explosion property.
Description
Technical field
The present invention relates to safety cable, specifically is a kind of intrinsic safety system instrument cable.
Background technology
Since the sixties in 20th century, the automation control system of large-scale construction project has all adopted control cable and instrument signal cable.Along with the development of automatic control and computer networking technology, this type of cable is widely used in every field.In petrochemical industry, mine, gas engineering etc. the place of explosion risk is arranged, cable has also been proposed the requirement of " explosion-proof ", and electric spark and thermal effect are the main ignition sources that causes the blast of hazardous gas environment.Consider from the system wiring angle, because stube cable exists distributed capacitance and distributed inductance, make stube cable become energy-storage travelling wave tube, their stored energys inevitably in signals transmission, in case system breaks down, these stored energys will discharge with the form of electric spark or thermal effect, influence the fail safe of system.The cable that uses of these dangerous situations requirement that all do not reach low electric capacity and low inductance at present, cable itself with electric charge more, explosion accident appears easily.
Summary of the invention
At the shortcoming of above-mentioned prior art, the invention provides a kind of intrinsic safety system instrument cable, reach the requirement of low electric capacity and low inductance, cable itself with electric charge few, be not easy to occur spark.
The present invention realizes with following technical scheme: a kind of intrinsic safety system instrument cable, comprise a plurality of cable cores of arranging along its length, each cable core comprises by two and alongst twists into the twisted pair wire that spiral helicine insulated conductor is formed, and the surface of each twisted pair wire is surrounded with the separator that this twisted pair wire and other twisted pair wire is separated and have colouring discrimination; Surface at separator also is coated with sub-shield, between separator and twisted pair wire packing material is arranged; The lapping layer that all cable cores are bundled together is arranged outside cable core, and the surface coverage of lapping layer has total screen; Surface at total screen is provided with sheath; Between lapping layer and cable core, be filled with packing material.
It further has: in sub-shield and total screen a drainage thread is set respectively.
The invention has the beneficial effects as follows: intrinsic safety system instrument cable has low electric capacity and low inductance, and has good shielding properties and interference free performance, and explosion-proof performance is better than general control cable and computer cable.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing is a radial section schematic diagram of the present invention.
Among the figure: 1, twisted pair wire; 11, insulated conductor; 2, separator; 3, sub-shield; 4, lapping layer; 5, total screen; 6, sheath; 7, drainage thread; 8, packing material.
Embodiment
As shown in drawings, intrinsic safety system instrument cable has a plurality of cable cores, and each cable core has twisted pair wire 1, and twisted pair wire 1 has two and alongst twists into spiral helicine insulated conductor 11; The surface of each twisted pair wire 1 is surrounded with the separator 2 that this twisted pair wire 1 and other twisted pair wire 1 is separated and have colouring discrimination, at separator 2 and 1 of twisted pair wire packing material is arranged; The surface coverage of separator 2 has a sub-shield 3; The lapping layer 4 that all cable cores are bundled together is arranged outside cable core, and the surface coverage of lapping layer 4 has total screen 5; The surface of total screen 5 is provided with sheath 6.Packing material 8 is arranged between lapping layer 4 and cable core, and packing material 8 adopts non-absorbent material.For the electrical continuity that guarantees to shield, in sub-shield 3 and total screen 5, a drainage thread 7 is set respectively; Drainage thread 7 adopts copper wire.
Twisted pair wire 1: twisted pair wire is by a pair of insulated conductor 11 (insulation color obvious difference should be arranged), and right with the be intertwined line that constitutes of the mode of spiral, insulating barrier makes the core of line centering can not cause short circuit because of bumping mutually.Twisted pair wire is generally used for transmitting balanced signal, at two leads while transmission signals, but phase phasic difference 180 degree of the signal code that they carry respectively, the influence that extraneous electromagnetic interference brings for two leads will be cancelled out each other, thereby make signal be unlikely to rapid decline.Spiral helicine structure also helps to offset the electric capacity that electric current is flowed through and might be increased in the lead process, if two parallel leads will form a width of cloth antenna, does not have this cancellation effect.In stranded process, strict control twisting pitch, and adjacent lines is to the pitch difference, and do not have the even-multiple relation.
Separator 2: employing and the immiscible material that closes of insulated conductor 11 external insulations are made, and utilize the coating extrustion process to form, and when extruding, all twisted pair wires are extruded in nib in company with separator 2 in addition.
Lapping layer 4: all twisted pair wires 1 are bundled together, prevent that cable core is loose in the laid processes.
Sheath 6: can adopt polyvinyl chloride or polyolefin; The halogen-free flameproof intrinsic safety system instrument cable should adopt halogen-free and low-smoke flame-retardant polyolefin.According to the requirement of intrinsic safety system, the color of sheath is blue, so that distinguish with cable with the non-intrinsically safe safety system.
Drainage thread 7: for the electrical continuity that guarantees to shield, and ground connection is installed conveniently, a copper wire of placement is made drainage thread in sub-shield 3 and total screen 5, and the drainage thread cross section is not less than 0.2mm2.
Packing material 8: fill with non-absorbent material, so that the outward appearance rounding; Packing material should be consistent with the working temperature of cable, and do not react with contact material; The cable that fire-retardant requirement is arranged adopts fire proofing to fill.
In addition, the cable that has tension to require can carry out armouring to cable, and armouring can adopt the wrapped mode in two ribbon spiral shape gaps, also can adopt the braided steel wire mode, under the armour inner covering will be arranged.Because painted steel has poison, armouring tape should adopt galvanized steel strip, and the anti-radial pressure of the cable of armouring tape is big.And the anti-longitudinal pulling force of the cable of braided steel wire armouring is big, and cable is soft, but working (machining) efficiency is low, the cost height; Armouring makes that also the shield effectiveness of cable is better simultaneously.
Claims (4)
1. intrinsic safety system instrument cable, comprise a plurality of cable cores of arranging along its length, each cable core comprises by two and alongst twists into the twisted pair wire (1) that spiral helicine insulated conductor (11) is formed that the surface of each twisted pair wire (1) is surrounded with the separator (2) that this twisted pair wire (1) and other twisted pair wire (1) is separated and have colouring discrimination; It is characterized in that: also be coated with sub-shield (3) on the surface of separator (2), between separator (2) and twisted pair wire (1), packing material (8) arranged; The lapping layer (4) that all cable cores are bundled together is arranged outside cable core, and the surface coverage of lapping layer (4) has total screen (5); Surface at total screen (5) is provided with sheath (6); Between lapping layer (4) and cable core, be filled with packing material (8).
2. intrinsic safety system instrument cable according to claim 2 is characterized in that: described packing material (8) adopts non-absorbent material.
3. intrinsic safety system instrument cable according to claim 1 is characterized in that: in sub-shield (3) and total screen (5) drainage thread (7) is set respectively.
4. intrinsic safety system instrument cable according to claim 3 is characterized in that: described drainage thread (7) adopts copper wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010232626 CN101901642A (en) | 2010-07-16 | 2010-07-16 | Intrinsic safety system instrument cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010232626 CN101901642A (en) | 2010-07-16 | 2010-07-16 | Intrinsic safety system instrument cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101901642A true CN101901642A (en) | 2010-12-01 |
Family
ID=43227113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010232626 Pending CN101901642A (en) | 2010-07-16 | 2010-07-16 | Intrinsic safety system instrument cable |
Country Status (1)
| Country | Link |
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| CN (1) | CN101901642A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575773A (en) * | 2013-10-18 | 2015-04-29 | 宁夏海洋线缆有限公司 | Steel wire armored high-fidelity cable |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181734Y (en) * | 1994-01-10 | 1994-11-02 | 天津市安琪尔特种线缆高新技术开发实业公司 | Meter signal control cable for water-proof and explosion-proof circuit |
| CN2757303Y (en) * | 2004-12-29 | 2006-02-08 | 上海乐庭电线工业有限公司 | High performance water-proof shield data communication paired cable |
| CN2824244Y (en) * | 2005-09-06 | 2006-10-04 | 扬州亚光电缆有限公司 | Measuring controlling cable for oil and gas pipeline explosion-proof |
| CN201199464Y (en) * | 2008-05-08 | 2009-02-25 | 扬州光明电缆有限公司 | Symmetrical control low-smoke non-bittern signal cable for ship |
| CN101707071A (en) * | 2009-12-04 | 2010-05-12 | 江苏远洋东泽电缆股份有限公司 | Low-smoke halogen-free light intrinsically-safe instrument flexible cable for ocean engineering |
| CN201717031U (en) * | 2010-07-16 | 2011-01-19 | 江苏省电力公司徐州供电公司 | Instrument cable for intrinsically safe system |
-
2010
- 2010-07-16 CN CN 201010232626 patent/CN101901642A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181734Y (en) * | 1994-01-10 | 1994-11-02 | 天津市安琪尔特种线缆高新技术开发实业公司 | Meter signal control cable for water-proof and explosion-proof circuit |
| CN2757303Y (en) * | 2004-12-29 | 2006-02-08 | 上海乐庭电线工业有限公司 | High performance water-proof shield data communication paired cable |
| CN2824244Y (en) * | 2005-09-06 | 2006-10-04 | 扬州亚光电缆有限公司 | Measuring controlling cable for oil and gas pipeline explosion-proof |
| CN201199464Y (en) * | 2008-05-08 | 2009-02-25 | 扬州光明电缆有限公司 | Symmetrical control low-smoke non-bittern signal cable for ship |
| CN101707071A (en) * | 2009-12-04 | 2010-05-12 | 江苏远洋东泽电缆股份有限公司 | Low-smoke halogen-free light intrinsically-safe instrument flexible cable for ocean engineering |
| CN201717031U (en) * | 2010-07-16 | 2011-01-19 | 江苏省电力公司徐州供电公司 | Instrument cable for intrinsically safe system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575773A (en) * | 2013-10-18 | 2015-04-29 | 宁夏海洋线缆有限公司 | Steel wire armored high-fidelity cable |
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Application publication date: 20101201 |