CN2566570Y

CN2566570Y - Self-controlled temp heating cable

Info

Publication number: CN2566570Y
Application number: CN 02263612
Authority: CN
Inventors: 徐忠庭
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-07
Filing date: 2002-08-07
Publication date: 2003-08-13
Anticipated expiration: 2012-08-07

Abstract

The utility model relates to an automatic temperature control heating cable which is composed of two parallel conducting wire cores, and PTC materials wrapped outside the conducting wire core. An insulating layer is wrapped outside the PTC materials, the conducting wire core is formed by twisting and combining single threads, and the conducting wire core is formed by coiling a plurality of single threads in a successive layer mode by using one single thread as a central line. The direction of the hour hand of adjacent two layers is opposite, the second layer has six single threads, and later, the number of the single threads of each layer is two times more than that of the previous layer. The utility model has the advantages of tight combination between single threads, good round degree of the wire core, high safety, good temperature control uniformity, etc.

Description

Self controlled heating cable

Technical field

The utility model technical scheme required for protection relates to a kind of self controlled heating cable.

Background technology

The structure of self controlled heating cable in the market is, the filament tow that is 0.25mm-0.15mm by 7-19 diameters becomes conductor wire core, squeezes into ptc material on two conductor wire cores parallel to each other, clads one deck insulating barrier again outside ptc material.The boundling mode of core adopts directly puts or common coiling.The heating cable of this existing structure has obvious defects, at first, adopt and directly put or the coiling of common winding mode, between the multifilament of conductor wire core in conjunction with defective tightness, cause the pine thigh easily, pine burst phenomenon can influence the fail safe of cable, under "on" position, these positions just might produce spark, and are very easily accidents caused; Secondly, adopt and directly put or the coiling of common winding mode, can not guarantee that conductor wire core has good roundness, influence combining between conductor wire core and the ptc material, can not guarantee the ptc material consistency of resistance everywhere, therefore cause the temperature control uniformity of ptc material inconsistent, produce the local overheating phenomenon, the thermal spike that causes ptc material takes place, and then causes burning band.In addition, filament diameter is thinner, extends become thinner in extruding drawing process easily, and if broken string cladded in PTC core band behind the broken string, also might produce spark, initiation fire during energising easily.

Summary of the invention

The utility model technical scheme required for protection technical problem to be solved provides that a kind of fail safe is good, the self controlled heating cable of temperature control good uniformity.

The utility model technical scheme required for protection is such:

Self controlled heating cable comprises that two parallel conductor wire cores and bag are attached to the outer ptc material of conductor wire core, outside ptc material, clad a layer insulating again, conductor wire core is twisted into by monofilament, conductor wire core is by the multifilament that is center line with monofilament coiled successively, the clockwise of adjacent two layers is opposite, the 2nd layer of monofilament number is 6, and later every layer number of filaments is 2 times of preceding one deck.

Filament diameter is between 0.30mm-0.60mm

The monofilament sum is between 7-37

For making cable have explosion-proof, ground connection, anti-punching press function, outside insulating barrier, clad one deck screen.

For making cable have functions such as grease proofing, fire-retardant, the anti-low temperature of anti-chemical burn into, outside screen, clad one deck restrictive coating.

The utility model technical scheme required for protection compared with prior art has obvious improvement: in conjunction with closely, can not produce electric spark under "on" position between the monofilament of (1) conductor wire core, can not cause security incident.(2) roundness of conductor wire core is good, helps ptc material and squeezes equably and be attached on the conductor wire core, makes conductor wire core combine with ptc material closely, and is favourable to the resistance consistency of assurance ptc material, makes cable have good temperature control uniformity.

Description of drawings

Fig. 1 is a structure principle chart of the present utility model.

Embodiment

As shown in Figure 1, self controlled heating cable comprises that two parallel conductor wire cores 1 and bag are attached to the ptc material 2 outside the conductor wire core 1, outside ptc material 2, clad a layer insulating 3 again, conductor wire core 1 is twisted into by monofilament 4, conductor wire core 1 is by the multifilament that is center line with monofilament coiled successively, the clockwise of adjacent two layers is opposite, and the 2nd layer of monofilament number is 6, and later every layer number of filaments is 2 times of preceding one deck.Filament diameter can be chosen between the 0.30mm-0.60mm; the monofilament sum can be chosen between the 7-37; the material of monofilament 4 can be selected tinned wird according to concrete instructions for use; nickel plated copper wire; silver-coated copper wire; a kind of in alloy wire or the carbon fibre; cladding one deck has explosion-proof outside insulating barrier 3; ground connection; the screen 5 of anti-punching press function; in order to protect the cable can long-term work; and adapt to extraneous than rugged environment; for example; want anti-chemical corrosion; grease proofing; fire-retardant; anti-low temperature etc.; also should clad one deck restrictive coating 6 outside screen 5, restrictive coating 6 can be used fluoroplastics; special polyolefine material is made.

Claims

1, a kind of self controlled heating cable, comprise that two parallel conductor wire cores [1] and bag are attached to the outer ptc material [2] of conductor wire core, outside ptc material, clad a layer insulating [3] again, conductor wire core is twisted into by monofilament [4], it is characterized in that: conductor wire core [1] is by the multifilament that is center line with monofilament coiled successively, the clockwise of adjacent two layers is opposite, and the 2nd layer of monofilament number is 6, and later every layer number of filaments is 2 times of preceding one deck.

2, self controlled heating cable according to claim 1 is characterized in that: monofilament [4] diameter is between 0.30mm-0.60mm.

3, self controlled heating cable according to claim 1 is characterized in that: monofilament [4] sum is between 7-37.

4, self controlled heating cable according to claim 1 is characterized in that: cladding one deck screen [5] outside insulating barrier [3].

5, self controlled heating cable according to claim 4 is characterized in that: cladding one deck restrictive coating [6] outside screen [5].