CN201323086Y

CN201323086Y - Novel heat tracing cable structure

Info

Publication number: CN201323086Y
Application number: CNU2008201597594U
Authority: CN
Inventors: 孙传宝; 戴礼云
Original assignee: Wuhu Hengxin Cable Co Ltd
Current assignee: Wuhu Hengxin Cable Co Ltd
Priority date: 2008-10-17
Filing date: 2008-10-17
Publication date: 2009-10-07
Anticipated expiration: 2018-10-17

Abstract

The utility model discloses a novel heat tracing cable tracing structure, which comprises conductive wire cores (1), wherein the outsides of the two parallel conductive wire cores (1) are extruded with a semiconductor PTC layer (2), the outside of the semiconductor PTC layer (2) is extruded with an insulating layer (3), the outside of the insulating layer (3) is weaved with a shield screen (4), a conductive wire (5) with an insulating layer is arranged outside the shield screen (4) in parallel, one end of the conductive wire (5) is connected with one end portion of one of the conductive wire cores (1) while the other end of the conductive wire (5) is in same direction with the other end portion of the conductive wire cores (1), and the outsides of the shield screen (4) and the conductive wire (5) are respectively extruded with sheath layers (6). The utility model with the special structure has the advantages of resolving the problems that starting current is increased caused by addition of the utilization length of the heat tracing cable and voltage is decreased caused by the addition of the length.

Description

A kind of novel accompanying-heat cable structure

Technical field

The utility model relates to a kind of construction of cable, especially relates to the construction of cable of a kind of antifreeze, pour point depression that is used for high-power outputs such as long lines, container, storage tank, insulation, companion's heat.

Background technology

Common 220V accompanying-heat cable is owing to the reason of the area of section of voltage drop and conductor thread core, the single use length of accompanying-heat cable is 100 meters, if accompanying-heat cable uses length to increase, then can make conductor wire core produce over-current phenomenon avoidance because of starting current is excessive, make the high temperature heating of conductor own, after the conductor heating, can directly destroy the electric resistance structure of semiconductor PTC.Active length because of accompanying-heat cable increases in addition, cause the terminal voltage of accompanying-heat cable to fall excessive, and make accompanying-heat cable tail end temperature low excessively, do not reach the effect of tracing thermal-insulating, so when accompanying hot duct length greater than 100 meters, can only increase power supply point and satisfy companion's heat, so both increase the cost of service cable, also increase the complexity of construction more than 100 mitrons.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of novel accompanying-heat cable structure at problems of the prior art, its objective is that both having reduced accompanying-heat cable causes starting current to increase because of using length to increase, and has reduced again to cause reducing of voltage because of length increases.

The technical solution of the utility model is that this a kind of novel accompanying-heat cable structure comprises conductor wire core, the outside of two conductor wire cores that are arranged in parallel is extruded with semiconductor PTC layer, the outside of semiconductor PTC layer is extruded with insulating barrier, the outside of insulating barrier is woven with gauze screen, the lead of tape insulation layer is arranged in parallel in the outside of gauze screen, one end of lead is connected with the end of a conductor wire core wherein, the other end of lead and the other end of conductor wire core in the same way, the outside of gauze screen and lead is extruded with restrictive coating.

A kind of novel accompanying-heat cable structure with above-mentioned special construction has the following advantages:

1, the heat traced pipeline temperature of this kind accompanying-heat cable is even, can be not overheated, and safe and reliable, saves energy.

2, low, the easy maintenance of installation and operating cost, during discontinuous operation, heating up starts fast.

3, be convenient to automatic management, non-environmental-pollution.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a connection principle schematic diagram of the present utility model.

In Fig. 1～Fig. 2,1: conductor wire core; 2: semiconductor PTC layer; 3: insulating barrier; 4: gauze screen; 5: lead; 6: restrictive coating.

Embodiment

Figure 1 shows that a kind of structural representation of novel accompanying-heat cable structure, Fig. 2 is a connection principle schematic diagram of the present utility model.By Fig. 1, as can be known shown in Figure 2, this accompanying-heat cable comprises conductor wire core 1, conductor wire core 1 is by three stranded forming of zinc-plated soft round line, the outside of two conductor wire cores that are arranged in parallel 1 is extruded with semiconductor PTC layer 2, the outside of semiconductor PTC layer 2 is extruded with insulating barrier 3, insulating barrier 3 is improvement property polyolefin, the outside of insulating barrier 3 is woven with gauze screen 4, gauze screen 4 is zinc-plated soft circular copper wire, coverage density is 80%, the lead 5 of tape insulation layer is arranged in parallel in the outside of gauze screen 4, one end of lead 5 is connected with the end of a conductor wire core 1 wherein, the other end of the other end of lead 5 and conductor wire core 1 in the same way, the outside of gauze screen 4 and lead 5 is extruded with restrictive coating 6, restrictive coating 6 is improvement property polyolefin.

Insert two core electric tracing leads by lead 5 from tail end, thereby form the dislocation connection, the voltage subitem inserts from the two ends, ribbon heater, has so both reduced accompanying-heat cable and has caused starting current to increase because of using length to increase, and has reduced again to cause reducing of voltage because of length increases.

Semiconductor PTC layer 2 forms the conductive network of numerous parallel connection by two conductor wire cores 1, electric-heating belt begins to heat up, in temperature-rise period, resistance with electric-heating belt of PTC function can become big gradually, in the process that temperature constantly rises, resistance becomes the secondary parabolic curve to rise, resistance is almost blocked electric current when temperature is raised to certain value, electric current in the circuit reaches minimum steady-state value at this moment, temperature reaches maximum, and when certain regional temperature changed, the parallel resistance value in the circuit also changed thereupon, electric current and temperature reach dynamic balance state once more, thereby play the automatic control effect repeatedly thus.

Claims

1. novel accompanying-heat cable structure, it is characterized in that: described accompanying-heat cable comprises conductor wire core (1), the outside of two conductor wire cores that are arranged in parallel (1) is extruded with semiconductor PTC layer (2), the outside of semiconductor PTC layer (2) is extruded with insulating barrier (3), the outside of insulating barrier (3) is woven with gauze screen (4), the lead of tape insulation layer (5) is arranged in parallel in the outside of gauze screen (4), one end of lead (5) is connected with the end of a conductor wire core (1) wherein, the other end of the other end of lead (5) and conductor wire core (1) in the same way, the outside of gauze screen (4) and lead (5) is extruded with restrictive coating (6).

2. a kind of novel accompanying-heat cable structure according to claim 1 is characterized in that: described conductor wire core (1) is by three stranded forming of zinc-plated soft round line.

3. a kind of novel accompanying-heat cable structure according to claim 2 is characterized in that: described insulating barrier (3) is improvement property polyolefin or fire retardant polyolefin or fluorine-containing polyolefin or perfluorinated material.

4. a kind of novel accompanying-heat cable structure according to claim 3, it is characterized in that: described gauze screen (4) is zinc-plated soft circular copper wire, and coverage density is 70%～90%.

5. a kind of novel accompanying-heat cable structure according to claim 4, it is characterized in that: the best coverage density of described gauze screen (4) is 80%.

6. according to the described a kind of novel accompanying-heat cable structure of each claim of claim 1～5, it is characterized in that: described restrictive coating (6) is improvement property polyolefin or fire retardant polyolefin or fluorine-containing polyolefin or perfluorinated material.