CN201667729U

CN201667729U - Single-core NI-Cr alloy strand PFA insulating and sheathing short-distance constant-power electric heating strip

Info

Publication number: CN201667729U
Application number: CN 201020163710
Authority: CN
Inventors: 周军政
Original assignee: JIANGYIN HUANENG ELECTRIC HEATING PRODUCT CO Ltd
Current assignee: JIANGYIN HUANENG ELECTRIC HEATING PRODUCT CO Ltd
Priority date: 2010-04-12
Filing date: 2010-04-12
Publication date: 2010-12-08
Anticipated expiration: 2020-04-12

Abstract

The utility model relates to a single-core Ni-Cr alloy strand PFA insulating and sheathing short-distance constant-power electric heating strip which is mainly used for the heat preservation and heating of pipelines and containers in the fields of petroleum chemical industry, firefighting, steel, power and the like. The electric heating strip is compounded by six layers from inside to outside as follows: a core wire (1), a first insulating layer (2), a second insulating layer (3), an internal sheath (4), a shielding layer (5), an external sheath (6) and a reinforced sheath (7), wherein the core wire (1) is made of single-core Ni-Cr alloy strand, the first insulating layer (2), the second insulating layer (3), the internal sheath (4) and the external sheath (6) are made of tetrafluoroethylene-polyfluoroether copolymer; and the reinforced sheath (7) is made of PVC. The electric heating strip can be repeatedly bent during the mounting process, thus greatly prolonging the service life.

Description

Single-core nichrome stranded wire PFA insulation and the permanent power of sheath short distance 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 nichrome stranded 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 a kind of single-core nichrome stranded wire PFA insulation and the permanent power of sheath short distance 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 and oversheath totally six layers be composited, described heart yearn adopts single-core nichrome stranded wire, and first insulating barrier, second insulating barrier, inner sheath and jacket material adopt tetrafluoroethene-perfluor ether copolymer.

Operation principle:

The utility model single-core nichrome stranded wire PFA insulation and the permanent power of sheath short distance 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 nichrome stranded 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 nichrome stranded wire PFA insulation has power output and the temperature resistant grade identical with permanent power ribbon heater in parallel with the permanent power of sheath short distance 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 utility model single-core nichrome stranded wire PFA insulation and the permanent power of sheath short distance 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, heating wire 8.

(5) embodiment

Referring to Fig. 3～4, Fig. 3 is the utility model single-core nichrome stranded wire PFA insulation and the permanent power of sheath short distance 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, the permanent power of the utility model single-core nichrome stranded wire PFA insulation and sheath short distance ribbon heater, from interior outside oneself successively by heart yearn 1, first insulating barrier 2, second insulating barrier 3, inner sheath 4, screen 5 and oversheath 6 totally six layers be composited.Described heart yearn 1 adopts single-core nichrome stranded wire; First insulating barrier 2, second insulating barrier 3, inner sheath 4 and oversheath 6 materials adopt PFA (tetrafluoroethene-perfluor ether copolymer).

Claims

1. a single-core nichrome stranded wire PFA insulate and the permanent power of sheath short distance 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) and oversheath (6) totally six layers be composited, described heart yearn (1) adopts single-core nichrome stranded wire, and first insulating barrier (2), second insulating barrier (3), inner sheath (4) and oversheath (6) material adopt tetrafluoroethene-perfluor ether copolymer.