CN2482305Y

CN2482305Y - Refractory electrothermal band

Info

Publication number: CN2482305Y
Application number: CN 00220079
Authority: CN
Inventors: 包觉兴
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-21
Filing date: 2000-04-21
Publication date: 2002-03-13
Anticipated expiration: 2010-04-21

Abstract

The utility model belongs to a heating cable with the fireproof function. An isolation layer, a jacket layer, a weaving layer, and a corrosion prevention enhanced layer are arranged in sequence outside the conducting bus of the electric heating belt, wherein, the isolation layer and the jacket layer are wrapped helically by fireproof mica tape layer by layer, the fireproof belt is fluorophlogopite paper, or phlogopite paper, or phlogopite paper and glass fiber adhered by heat resistance silicone resin. The utility model is characterized in that the fireproof performance is good, and the service lift is long.

Description

The flame proof electrical torrid zone

The utility model belongs to a kind of heating cable with fire-resistant function.

Parallel plastic tape, tandem plastic tape and 3 kinds of forms of tandem MI heating cable are divided in existing permanent power ribbon heater.Wherein, fluoroplastics particle (F is generally used in the plastics ribbon heater ₄₆Or PFA) be extruded into core insulation layer and various restrictive coating by the high temperature plastics plastic extruding machine, it only is applicable to that generally medium safeguards that temperature is at the pipeline below 200 ℃, tank body tracing thermal-insulating.When the medium holding temperature is higher than more than 200 ℃, or require limit heating power, limit pipeline with the high-temperature steam pipeline purging, this moment is owing to the temperature that fluoroplastic insulation layer, restrictive coating near the position, ribbon heater can reach more than 280 ℃ very soon makes fluoroplastics softening, and along with the energising and the continuity of pipeline purging, temperature rises higher and higher, fluoroplastics become fluidised form shape gradually, and insulating barrier and restrictive coating damage, and cause ribbon heater short circuit, ground connection and damage.Simultaneously when temperature reaches more than 300 ℃, general terne metal or slicker solder high temperature alloy also melt, make the heating wire and the busbar sealing-off of parallel type electric heating strip, oxide layer appears between heating wire and bus, contact resistance increases, just easier thermal oxidation excessively, so vicious circle, even insulating barrier does not damage, also can parallel type electric heating strip not generated heat;

Existing MI heating cable is because its insulating barrier is the MgO powder, oversheath is a metal tube, though the medium holding temperature can reach 350 ℃, but because the series connection band can only use by fixed length in single pipeline, can not in pipe network, use, and the easy moisture absorption of MgO powder, end socket is dealt with improperly, very easily causes decreasing insulating; Simultaneously, the oversheath of MI cable is a metal tube, and flexibility is poor, is that line contacts with heat traced pipeline, and it is relatively poor with radiating effect to conduct heat.

The purpose of this utility model is to provide a kind of temperature resistant grade height, good heat conductivity, electrical insulation properties good, and product softness, I﹠M be the flame proof electrical torrid zone easily.

Its main technical schemes is that insulating barrier, restrictive coating, braid and anticorrosion reinforced layer are arranged outside busbar successively, insulating barrier wherein and restrictive coating are entwined with helical form from level to level by fire-resistant cloud bar, and described fire-resistant cloud bar utilizes heat-resisting silicones to cohere by fluorophologopite paper or phlogopite paper or mica paper and glass fabric and forms; Restrictive coating two-layerly is made of inside and outside, coiling one deck heating wire between inside and outside restrictive coating, and on inner restrictive coating and insulating barrier, every a segment distance one opening is set, heating wire respectively with busbar in a welding successively, used be welded as solder brazing, formation is connected in parallel; When being series-mode frame, only need the mutual short circuit of an end with busbar, not be used in busbar and twine heating wire outward.

The utility model has the advantages that because insulating barrier and restrictive coating all utilize the very high mica paper of fire resistance to be entwined from level to level, easy to make, resistance to elevated temperatures is good, still can heating power when the medium holding temperature is 500 ℃, and can use the steam pipeline purging while switching on, its useful life is also long than other product in addition; The utility model is compared with the MI heating cable, has the temperature resistant grade height, product specification is wide in variety, wide adaptability, the many and simplicity of design of use occasion, characteristics such as easy for installation.

Structure chart when Fig. 1 is connected in parallel for the utility model.

Fig. 2 is the structure chart when being connected in series.

Figure 2 shows that the three-phase series-mode frame, busbar 1 has 3, twines insulating barrier 2 and restrictive coating 3 outside every busbar 1 successively, again at restrictive coating 3 outsourcing layer of metal braids 7, then, coats with anticorrosion reinforced layer 8.Insulating barrier 2 is a kind of fire-resistant cloud bar with restrictive coating 3, and this fire-resistant cloud bar utilizes heat-resisting silicones to cohere by fluorophologopite paper or phlogopite paper or mica paper and glass fibre and forms.

When adopting parallel way to connect, as shown in Figure 1, restrictive coating two-layerly is made of inside and outside, 3,6 of inside and outside restrictive coatings one deck heating wire 4 is arranged, on insulating barrier 2 and inner restrictive coating 3, offer a hole again every a segment distance, the mode of utilizing soldering with heating wire 4 respectively successively with busbar 1 in one is connected at interval, heating wire 4 and busbar 1 formation are connected in parallel.5 is pad.

Fire-resistant anticorrosion reinforced layer 8 also can utilize fire-resistant cloud bar to be entwined.

Claims

1, the flame proof electrical torrid zone has insulating barrier (2), restrictive coating (3), braid (7) and anticorrosion reinforced layer (8) successively outside busbar (1), it is characterized in that insulating barrier (2) and restrictive coating (3) are entwined with helical form from level to level by fire-resistant cloud bar.

2, ribbon heater according to claim 1 is characterized in that fire-resistant cloud bar utilizes heat-resisting silicones to cohere by fluorophologopite paper or phlogopite paper or mica paper and glass fabric and forms.

3, ribbon heater according to claim 1, it is characterized in that restrictive coating is made of inside and outside two-layer (3), (6), coiling one deck heating wire (4) between inside and outside restrictive coating (3), (6), and on inner restrictive coating (3) and insulating barrier (2), every a segment distance one opening is set, heating wire (4) respectively with busbar (1) in a root bead connect, formation is connected in parallel.

4, ribbon heater according to claim 1 is characterized in that the mutual short circuit of an end of busbar (1), and formation is connected in series.

5, according to claim 3 or 4 described ribbon heaters, it is characterized in that the used solder brazing that is welded as.