CN215731061U - Intrinsic safety computer cable - Google Patents

Abstract

The utility model discloses an intrinsically safe computer cable which comprises a plurality of inner-layer wire core groups and an outer-layer wrapping layer, wherein each wire core group is formed by twisting two single wires in pair, and a shielding isolation layer is wrapped outside each wire core group; the covering is insulating layer, flame retardant coating, waterproof shielding layer and oversheath outside from interior to exterior in proper order, between a plurality of sinle silk group, sinle silk group and fill between the covering have thermal-insulated packing material, and the single line core comprises anaerobic copper conductor and crowded package at the outside pottery polyolefin insulating layer of anaerobic copper conductor, and the shielding isolation layer has two-layer structure, takes isolation layer and copper to mould the area shielding layer for polyester in proper order from interior to exterior. When the anti-static shielding structure is used, the sub-shielding layer and the total shielding layer are adopted, the shielding layer not only plays a role in inhibiting electromagnetic waves from being emitted to the outside, but also can be used as a channel of short-circuit current, the protection effect and the excellent shielding effect of a neutral wire core can be played, and meanwhile, the anti-static shielding structure has an anti-static effect and avoids combustible and explosive accidents caused by sparks.

Description

Intrinsic safety computer cable

Technical Field

The utility model mainly relates to the technical field of cables, in particular to an intrinsic safety computer cable, and particularly relates to an explosion-proof and fireproof intrinsic safety computer cable.

Background

With the rapid development of industrial automation in China, the explosion-proof cable is used as power supply equipment of communication, monitoring, detection, alarm and control systems in the production process, and the application range of computer cables is continuously expanded. For example, cables are also needed in coal mines, petroleum, chemical industry, textiles and other environments containing flammable and explosive mixtures, which puts higher demands on the performance of the cables.

Therefore, an explosion-proof safety cable is urgently needed in the market, safety performances such as interference resistance, fire resistance, radial water resistance, environmental protection, static resistance, explosion prevention and the like are needed, the explosion-proof safety cable can be suitable for application in various environments, and meanwhile, the requirement on the shielding performance of the cable is also more severe due to the influence of the use environment.

Disclosure of Invention

Aiming at the problems, the utility model provides the intrinsic safety computer cable which has the advantages that through the improvement of the cable structure, the partial shielding and the total shielding are adopted, the neutral wire core is protected, meanwhile, the intrinsic safety computer cable is explosion-proof and fireproof, and the intrinsic safety computer cable is suitable for the environment of flammable and explosive mixtures.

The purpose of the utility model can be realized by the following technical scheme: the intrinsically safe computer cable is characterized by comprising a plurality of inner-layer wire core groups and an outer-layer wrapping layer, wherein each wire core group is formed by twisting two single wires in pair, and a shielding isolation layer is wrapped outside each wire core group; the wrapping layer sequentially comprises a heat insulation layer, a fire-resistant layer, a waterproof shielding layer and an outer sheath from inside to outside, and heat insulation filling materials are filled among the plurality of wire core groups and between the wire core groups and the wrapping layer; the single wire core is composed of an oxygen-free copper conductor and a ceramic polyolefin insulating layer extruded outside the oxygen-free copper conductor, the shielding isolation layer has a two-layer structure, and the polyester tape isolation layer and the copper plastic tape shielding layer are sequentially arranged from inside to outside.

Furthermore, the copper plastic belt shielding layer is formed by the structure of an inner copper belt layer and an outer plastic layer, and the thickness of the copper belt layer is more than or equal to 0.06 mm.

Compared with the prior art, the technical scheme of the utility model comprises the improvement of a plurality of details besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:

1. according to the improved scheme, each wire core group is formed by twisting two single wire cores in pair, and a shielding isolation layer is wrapped outside each wire core group; the wrapping layer comprises a heat insulation layer, a fire-resistant layer, a waterproof shielding layer and an outer sheath in sequence from inside to outside, the utility model adopts a sub-shielding layer and a main shielding layer, the shielding layer not only plays a role of inhibiting electromagnetic waves from emitting outwards, but also can be used as a channel of short-circuit current, and can play a role of protecting a neutral wire core and an excellent shielding effect;

2. according to the technical scheme, the shielding isolation layer outside the single wire core is of a two-layer structure, the polyester tape isolation layer and the copper-plastic tape shielding layer are sequentially arranged from inside to outside, the copper-plastic composite tape is used as a sub-shield and is used for shielding electromagnetic interference suffered by the communication wire core, and the shielding layer plays a role in blocking, so that the core wire is only electromagnetically coupled with the shielding layer;

3. the preparation method of the improved technology has the advantages of quick cabling process, safety, high efficiency, high yield, improved product quality, and reduced production cost and production period;

4. the cable structure and the process have high commercial value and are convenient to popularize and utilize.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

The labels in the figure are as follows:

1 oxygen-free copper conductor, 2 ceramic polyolefin insulating layer, 3 polyester tape isolating layer, 4 copper plastic tape shielding layer, 5 alkali-free glass rope, 6 insulating layer, 7 fire-resistant layer, 8 waterproof shielding layer and 9 outer sheath;

11 single-wire cores and 12 wire core groups.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the utility model has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the utility model.

As shown in fig. 1, an intrinsically safe computer cable is different from the prior art in that the intrinsically safe computer cable comprises a plurality of inner core groups and an outer wrapping layer, each core group is formed by twisting two single cores in pairs, and a shielding isolation layer is wrapped outside each core group; be insulating layer 6, flame retardant coating 7, waterproof shielding layer 8 and oversheath 9 around the covering from inside to outside in proper order, between a plurality of sinle silk group, sinle silk group and around packing have thermal-insulated packing material between the covering, the single line core comprises anaerobic copper conductor and crowded package at the outside pottery polyolefin insulating layer of anaerobic copper conductor, the shielding isolation layer has two-layer structure, takes the isolation layer and copper plastic tape shielding layer for polyester in proper order from inside to outside.

In the implementation, the number of the wire core groups is singular, 5, 7, 9 or 11 are usually adopted, when the cable is formed, one wire core group is placed in the middle, the other wire core groups are arranged around in the clockwise direction, and the twisting direction is the right direction. The cable adopts the total shielding structure behind every branch shielding structure of sinle silk group and the stranding, and the shielding layer both plays the effect of inhibiting the electromagnetic wave and outwards launches, can regard as short-circuit current's passageway again, can play the guard action of neutral sinle silk, has antistatic action simultaneously, avoids the flammable accident that explodes that arouses because of the spark for the cable can use in the environment of complicacy, and explosion-proof fireproof effect is excellent.

Example 1

As shown in fig. 1, the cable of the present invention includes 7 core groups arranged in sequence in an inner layer and a wrapping layer in an outer layer, each core group is formed by twisting two single cores in pairs, and a shielding isolation layer is wrapped outside each core group; be insulating layer, flame retardant coating, waterproof shield layer and oversheath outside and in proper order around the covering, between the adjacent sinle silk group, sinle silk group and around packing have thermal-insulated filler material between the covering.

Preferably, the single-wire core is composed of an oxygen-free copper conductor and a ceramic polyolefin insulating layer 2 extruded outside the oxygen-free copper conductor 1, the shielding isolation layer has a two-layer structure, the polyester tape isolation layer 3 and the copper plastic tape shielding layer 4 are sequentially arranged from inside to outside, the copper plastic tape shielding layer is synthesized by an inner copper tape layer and an outer plastic layer, and the thickness of the copper tape layer is larger than or equal to 0.06 mm. When the winding is carried out, the copper strip layer is close to the wire core for winding, and the plastic layer is an outer layer. The copper-plastic composite belt is used as a branch shield for shielding the electromagnetic interference on the communication wire core, the shielding layer plays a role in blocking, the core wire is only electromagnetically coupled with the shielding layer, and the distributed capacitance between the shielding layer and an external metal object has no relation to the core wire. The copper wire drainage wire is arranged between the copper strip layer and the plastic layer, the copper wire drainage wire is longitudinally arranged or spirally wound outside the copper strip layer, 4-6 copper wire drainage wires are uniformly distributed along the outside of the copper strip layer in the longitudinal arrangement, and the transmission effect of current is improved.

Further, the shielding isolation layer is provided with pressure relief grooves, specifically, 2-4 pressure relief grooves are uniformly distributed on the copper plastic tape shielding layer, and meanwhile, the heat insulation layer is formed by wrapping alkali-free glass fiber ropes 5; the fire-resistant layer is a ceramic polyolefin insulating layer with the thickness of 2.5-5 mm. The waterproof shielding layer is made of an argon arc welding longitudinally-wrapped copper strip and is in a thread-shaped structure; the outer sheath adopts an antistatic outer sheath, and the thickness of the outer sheath is 1.8-3.0 mm.

The utility model has the following advantages in use:

1. excellent shielding effect adopts branch shielding and total shielding, and the shielding layer both plays the effect of inhibiting the electromagnetic wave from outwards launching, can regard as the passageway of short-circuit current again, can play the guard action of neutral sinle silk, has antistatic effect simultaneously, avoids the flammable accident of exploding that arouses because of the spark.

2. The environment-friendly type: no heavy metal, no toxicity, no smell, no influence on human body and environment; preventing ant and rat bite, and resisting water and oil.

3. The heat insulation performance is good, the heat conductivity coefficient is 0.09W/Mk, particularly, the interior after ablation is uniform honeycomb, and the heat insulation performance has better fire resistance and heat insulation performance.

4. The fireproof performance is excellent, the fire-resistant grade can reach the A-grade standard of GB12666.6, namely the 3A fuse is not fused after being burnt in flame at 950-1000 ℃ for 90 min; the highest level of C W Z of GB 6387 can be achieved, namely C-burning 3H in 950 ℃ flame, W-water spraying, Z-shaking.

5. In a word, the high-performance intrinsic safety computer cable has the safety use performance of resisting interference, resisting fire, radially preventing water, protecting environment, resisting static electricity and preventing explosion.

Example 2

The cable comprises 11 wire core groups on an inner layer and a wrapping layer on an outer layer, wherein the wire core groups are sequentially arranged, each wire core group is formed by twisting two single wire cores in pair, and a shielding isolation layer is wrapped outside each wire core group; be insulating layer, flame retardant coating, waterproof shield layer and oversheath outside and in proper order around the covering, between the adjacent sinle silk group, sinle silk group and around packing have thermal-insulated filler material between the covering.

Specifically, the conductor is made of an oxygen-free copper wire with the specification of 0.5-4mm2, and a type 1, a type 2 or a type 5 conductor can be adopted according to the use condition. The surface of the copper conductor is extruded with ceramic polyolefin insulating material, the insulating material has excellent insulating property, and the volume resistivity is more than or equal to 2 multiplied by 10¹⁵Omega cm. The crusting speed is high, and the crusting is hard; under the conditions of 350-1600 ℃ with flame and no flame, the hard armor shell can be fired, the ceramic armor body after the firing is harder at higher temperature for longer time, the residue is a pure ceramic inorganic substance, the ceramic armor body can form compact cellular fine micropores in the ablation process, a layer of enamel film can be formed on the surface of the ceramic armor body, the effects of good fire resistance, fire blocking, heat insulation and temperature insulation can be achieved, and the requirements of A-level CWZ spraying and vibration tests at 950-1100 ℃ for more than 180min and the highest BS6387 level CWZ can be met.

Then, each wire core group is composed of two single wire cores to form a pair, each pair of wire cores is twisted in pairs, the twist pitch is different from 20-30 mm, and each pair of wire core groups are distinguished by different colored tapes. Two layers of polyester tapes with the thickness of 0.05mm are lapped and wrapped outside each wire core group, the covering rate is not less than 20%, and the polyester tapes are used as a part of the shielding isolation layer. The outer surface of the polyester belt is respectively wrapped with a copper-plastic composite belt with the thickness of 0.1mm, and the thickness of a copper layer in the copper-plastic composite belt is not less than 0.06 mm. When wrapping, the sinle silk is pressed close to on the copper strip layer, and the plastic layer is outer. The copper-plastic composite belt is used as a branch shield for shielding the electromagnetic interference on the communication wire core, the shielding layer plays a role in blocking, the core wire is only electromagnetically coupled with the shielding layer, and the distributed capacitance between the shielding layer and an external metal object has no relation to the core wire.

During cabling, the wire core groups are arranged in the clockwise direction, and the outermost layer is twisted in the right direction. And during cabling, alkali-free glass fiber ropes are filled between cable cores, two layers of alkali-free glass belts with the thickness of 0.2mm are wrapped on the cable cores and tightened, so that the cable cores are cabled round, and the alkali-free glass fiber ropes and the bag belts play a role in heat insulation. A fire-resistant layer is extruded outside the cabled wire core group, the fire-resistant layer is made of ceramic polyolefin insulating material, the ceramic polyolefin insulating material can be self-extinguished without delayed combustion when horizontally combusted, and the oxygen index is more than or equal to 35; under the conditions of 350 plus 1600 ℃ with flame and no flame, the ceramic armor does not melt, drop or fall off, does not cause secondary fire, can be fired into a hard ceramic armor, the harder the ceramic armor fired for a longer time at a higher temperature, the ceramic inorganic substance as the residue, the residual content of the ceramic inorganic substance is more than 80 percent, the ceramic armor can form honeycomb ceramic fine micropores to play a good fire insulation and heat insulation effect, and the excellent flame retardance of the ceramic armor can play a good fire prevention role.

And then, using argon arc welding production equipment to longitudinally wrap a layer of copper strip outside the cable core fire-resistant layer, and after longitudinally wrapping the copper strip by argon arc welding, rolling the threads into a thread shape, so that the cable is easy to bend. The thickness of the copper strip is 0.4 mm-0.6 mm according to the outer diameter of the fire-resistant layer. The copper strip is a red copper strip. After the cable core is coated with the threaded copper pipe, the interference of an internal electric field and an external electric field and a magnetic field can be shielded; the sealing copper pipe can radially block water; thirdly, the copper pipe can be used as a grounding wire to shield static electricity, so that fire caused by leakage current is avoided; and fourthly, the copper pipe plays a role of an armor layer to protect the cable core.

And finally, the outer sheath is extruded on the fireproof layer in an extrusion mode, and the thickness of the outer sheath is 1.8-3.0 mm. According to different requirements, a polyvinyl chloride resistant or low-smoke halogen-free sheath material can be selected, and an antistatic agent is added into the sheath material to prevent electrostatic sparks generated in installation and use.

It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the utility model and are not intended to limit the utility model. In conclusion, the scope of the present invention shall include those alterations or substitutions and modifications which are obvious to those of ordinary skill in the art, and shall be subject to the appended claims.

Claims (4)

1. The intrinsically safe computer cable is characterized by comprising a plurality of core groups and a wrapping layer, wherein the core groups are arranged on the inner layer, the wrapping layer is arranged outside the core groups, each core group is formed by twisting two single wire cores in pair, and a shielding isolation layer is wrapped outside each core group; the wrapping layer sequentially comprises a heat insulation layer, a fire-resistant layer, a waterproof shielding layer and an outer sheath from inside to outside, and heat insulation filling materials are filled among the plurality of wire core groups and between the wire core groups and the wrapping layer; the single wire core is composed of an oxygen-free copper conductor and a ceramic polyolefin insulating layer extruded outside the oxygen-free copper conductor, the shielding isolation layer has a two-layer structure, and the polyester tape isolation layer and the copper plastic tape shielding layer are sequentially arranged from inside to outside.

2. An intrinsically safe computer cable as claimed in claim 1, wherein the copper plastic tape shielding layer is formed by a two-layer structure of an inner copper tape layer and an outer plastic layer.

3. The intrinsically safe computer cable of claim 1, wherein the insulating layer is wrapped with alkali-free glass fiber rope; the fire-resistant layer is a ceramic polyolefin insulating layer with the thickness of 2.5-5 mm.

4. The intrinsically safe computer cable of claim 1, wherein the outer jacket is an antistatic outer jacket and has a thickness of 1.8-3.0 mm.

Images