CN201708954U

CN201708954U - One-core constantan alloy stranded wire PFA insulator and protective jacket and PVC strengthened protective jacket electric heating cable

Info

Publication number: CN201708954U
Application number: CN2010201673792U
Authority: CN
Inventors: 龚徐兴
Original assignee: JIANGYIN HUANENG ELECTRIC HEATING PRODUCT CO Ltd
Current assignee: JIANGYIN HUANENG ELECTRIC HEATING PRODUCT CO Ltd
Priority date: 2010-04-14
Filing date: 2010-04-14
Publication date: 2011-01-12
Anticipated expiration: 2020-04-14

Abstract

The utility model relates to a one-core constantan alloy stranded wire PFA insulator and a protective jacket and a PVC strengthened protective jacket electric heating cable, which is mainly use for keeping warm and heating of pipe and container in petrochemical industry, fire protection, steel, electric power and the like. The electric heating cable comprises seven layers of a core wire (1), a first insulating layer (2), a second insulating layer (3), an inner protective jacket (4), a shielding layer (5), an outer protective jacket (6) and a strengthened protective jacket (7) that are sequentially compounded from inside to outside. The core wire (1) adopts a one-core constantan alloy stranded wire. The first insulating layer (2), the second insulating layer (3), the inner protective jacket (4) and the outer protective jacket (6) are made of tetrafluoroethylene-perfluoroether copolymer. The strengthened protective jacket (7) is made of PVC. The electric heating cable during installing can be bent repeatedly, thereby greatly prolonging service life.

Description

Single core constantan twisted wire PFA insulation and sheath and PVC reinforced sheath ribbon heater

(1) technical field

The utility model relates to a kind of permanent power ribbon heater.Be mainly used in the insulation and the heating of pipelines such as petrochemical industry, fire-fighting, iron and steel, electric power, container.The ground that also is applicable to solar pipe, the civil buildings snow melt etc. of warming up.Belong to the electrothermal device technical field.

(2) background technology

Before the utility model was made, conventional permanent power ribbon heater was a kind of permanent power ribbon heater in parallel.Its structure as depicted in figs. 1 and 2.Its operation principle: power source bus is two parallel insulated copper wires, twines heating wire on the inner sheath insulating barrier, and heating wire is connected with power source bus at a certain distance, forms continuous parallel resistance.After the power source bus energising, each parallel resistance heating, thereby form a continuous heating tape.Its characteristics: the caloric value of ribbon heater unit length is constant, and the ribbon heater of use is long more, and the power of output is big more.The application scenario: permanent power ribbon heater in parallel generally is used for the tracing thermal-insulating of little pipeline or pipe network system short tube line.This perseverance power ribbon heater in parallel existing problems: permanent power ribbon heater in parallel is to be welded on copper busbar as heater by the thinner nichrome wire in line footpath because of product, should not repeat bending when install the ribbon heater, and useful life is short partially.

(3) summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, can repeat bending when providing a kind of ribbon heater to install, the single core constantan twisted wire PFA insulation that useful life is long and the permanent power series electrical of the sheath short distance torrid zone.

The purpose of this utility model is achieved in that the PFA insulation of a kind of single core constantan twisted wire and sheath and PVC reinforced sheath ribbon heater, it is characterized in that described ribbon heater from interior from outside successively by heart yearn, first insulating barrier, second insulating barrier, inner sheath, screen, oversheath and reinforced sheath totally seven layers be composited, described heart yearn adopts single core constantan twisted wire, first insulating barrier, second insulating barrier, inner sheath and jacket material adopt tetrafluoroethene-perfluor ether copolymer, and the reinforced sheath material adopts PVC.

Operation principle:

Twisted wire PFA insulation of the utility model list core constantan and sheath and PVC reinforced sheath ribbon heater are a kind of electric-heating belts of being made heater (heart yearn), the insulation of PFA (tetrafluoroethene-perfluor ether copolymer) do and sheath by the constantan twisted wire, heart yearn two ends, ribbon heater are inserted power supply phase line and zero line respectively, form a single-phase heating circuit.Because the resistance of heart yearn unit length and the electric current that passes through are all constant, so whole ribbon heater generates heat evenly from beginning to end, power output is constant.

The beneficial effects of the utility model are:

Single core constantan twisted wire PFA insulation has power output and the temperature resistant grade identical with permanent power ribbon heater in parallel with sheath and PVC reinforced sheath ribbon heater, but, mode of heating generates heat because of being become by heart yearn by the electrothermal wire heating, avoided ribbon heater in parallel in the past owing to bend repeatedly and the aging fault that causes of pad, can repeat bending when install the ribbon heater, prolong useful life greatly.200 ℃ of the high-temperature resistants of PFA insulating barrier and sheath ribbon heater product, 120 ℃ of the high maintenance temperature of medium.

(4) description of drawings

Fig. 1 is permanent power ribbon heater in parallel Facad structure schematic diagram in the past.

Fig. 2 is the A-A cut-away view of Fig. 1.

Fig. 3 is the twisted wire PFA insulation of the utility model list core constantan and sheath and PVC reinforced sheath ribbon heater Facad structure schematic diagram.

Fig. 4 is the B-B cut-away view of Fig. 3.

Reference numeral among the figure:

Heart yearn 1, first insulating barrier 2, second insulating barrier 3, inner sheath 4, screen 5, oversheath 6, reinforced sheath 7, heating wire 8.

(5) embodiment

Referring to Fig. 3～4, Fig. 3 is the twisted wire PFA insulation of the utility model list core constantan and sheath and PVC reinforced sheath ribbon heater Facad structure schematic diagram.Fig. 4 is the B-B cut-away view of Fig. 3.By Fig. 3 and Fig. 4 as can be seen, twisted wire PFA insulation of the utility model list core constantan and sheath and PVC reinforced sheath ribbon heater, from interior from outside successively by heart yearn 1, first insulating barrier 2, second insulating barrier 3, inner sheath 4, screen 5, oversheath 6 and reinforced sheath 7 totally seven layers be composited.Described heart yearn 1 adopts single core constantan twisted wire; First insulating barrier 2, second insulating barrier 3, inner sheath 4 and oversheath 6 materials adopt PFA (tetrafluoroethene-perfluor ether copolymer); Reinforced sheath 7 materials adopt PVC.

Claims

1. single core constantan twisted wire PFA insulation and sheath and PVC reinforced sheath ribbon heater, it is characterized in that described ribbon heater from interior from outside successively by heart yearn (1), first insulating barrier (2), second insulating barrier (3), inner sheath (4), screen (5), oversheath (6) and reinforced sheath (7) totally seven layers be composited, described heart yearn (1) adopts single core constantan twisted wire, first insulating barrier (2), second insulating barrier (3), inner sheath (4) and oversheath (6) material adopt tetrafluoroethene-perfluor ether copolymer, and reinforced sheath (7) material adopts PVC.