CN101232749B - Matrix wiring type metal electric heating membrane - Google Patents

Abstract

The invention discloses a matrix wiring metal electric heating film, which comprises an insulation film (1) and an insulation film (2). A plurality of conductive units (3) are arranged between the insulation film (1) and the insulation film (2); each conductive unit comprises a metallic thin film line (4); the two ends of the metallic thin film line (4) are connected with a positive supply line (5) and a negative supply line (6) respectively; a plurality of isoelectric lines (7) are connected between every adjacent conductive units (3); the two ends of every isoelectric line (7) are connected with the isoelectric points of two metallic thin film lines (4). A whole metallic thin film line is cut into a plurality of sections by the isoelectric connection point; if one section is broken off (shut off) by external force, the source current can circumambulate to the next section and reach the power negative electrode through the isoelectric line to ensure that the other sections can be electrified and heated as usual, thus reducing the loss of efficiency of the whole product, ensuring normal use of the product and improving the reliability of the product.

Description

Matrix wiring type metal electric heating membrane

Technical field:

The present invention relates to a kind of metal electric heating membrane, especially a kind of matrix wiring type metal electric heating membrane that guarantees product operating power and reliability.

Background technology:

At present, the Electric radiant Heating Film product mainly contains following two kinds: be the ink film of heater with the electrically conductive ink and be the metal electric heating membrane of heater with the metallic film lines, metal electric heating membrane is compared with the printing ink Electric radiant Heating Film, with its have anti-aging, life-span long, anti-heat storage capacity is strong, stable performance ... etc. plurality of advantages and obtain the favor in market.But, because existing metal electric heating membrane is to be equipped with a plurality of separate conductive units between two-layer insulation film, each conductive unit constitutes by snakelike metallic film lines of back and forth controlling, the two ends of metallic film lines join with positive and negative power line respectively, so when fractureing (circuit breaker) because of external force as any position of metallic film lines, whole piece metallic film lines have generated heat with regard to non-conductive, reduce the operating efficiency and the reliability of entire product, influenced the normal use of product.

Summary of the invention:

The present invention is in order to solve existing in prior technology the problems referred to above, a kind of matrix wiring type metal electric heating membrane that guarantees product operating power and reliability to be provided.

Technical solution of the present invention is: a kind of matrix wiring type metal electric heating membrane, insulation film 1,2 is arranged, between insulation film 1,2, be equipped with a plurality of conductive units 3, each conductive unit 3 constitutes by strip metal film lines 4, the two ends of metallic film lines 4 join with positive and negative power line 5,6 respectively, be connected to many equipotential lines 7 between each adjacent conductive unit 3, the isopotential point of the two ends of every equipotential line 7 and two strip metal film lines 4 joins.

Described metallic film lines 4 are back and forth controlled, and described equipotential line 7 is connected on the close flex point.

The present invention is connected to a plurality of equipotential lines on each two adjacent strip metal film lines, by the equipotential tie point whole piece metallic film lines are divided into multistage, as wherein one section fracture (opening circuit) because of external force, source current then can detour to next section and the final power cathode that arrives by equipotential line, make other sections heating power as usual, reduce the operating efficiency loss of entire product, guaranteed the normal use of product, further improved reliability of products.

Description of drawings:

Fig. 1 is the structural representation of the embodiment of the invention.

Fig. 2 is the circuit diagram of the embodiment of the invention.

Embodiment:

Below in conjunction with description of drawings the specific embodiment of the present invention.As shown in Figure 1: a kind of matrix wiring type metal electric heating membrane, have with the identical insulation film 1,2 of prior art, between insulation film 1,2, be equipped with a plurality of conductive units 3, each conductive unit 3 constitutes by strip metal film lines 4, the two ends of metallic film lines 4 join with positive and negative power line 5,6 respectively, unlike the prior art be between each adjacent conductive unit 3, to be connected to many equipotential lines 7, the isopotential point of the two ends of every equipotential line 7 and two strip metal film lines 4 joins, and described isopotential point is complete equipotential or approximate equipotential.For improving the heat generation rate of conductive unit, metallic film lines 4 are snakelike for what back and forth control usually, and at this moment, described equipotential line 7 is connected on the close each other flex point (isopotential point).

Operation principle and effect are as follows:

Operation principle is as shown in Figure 2: the embodiment of the invention has m conductive unit 3, and the m row are promptly arranged; Be provided with n isopotential point in one row, as A1, B1 A2, B2 A3, B3 A4, B4 Am, Bm ... Deng; Each isopotential point is divided into n section (matrix element) with whole piece metallic film lines 4, every section resistance is respectively R1m, R2m, R3m, R4m, R5m ... R (n-4) m, R (n-3) m, R (n-2) m, R (n-1) m, Rnm, equipotential line 7 is connected in A1, A2, A3, A4 ... reach B1, B2, B3, B4 ... between.Under the normal condition, do not have electric current to pass through between the equipotential line 7, the metallic film lines 4 of every conductive unit 3 all work alone, and are independent of each other.Suppose that the 4th section metallic film lines when (m-3) conductive unit are that R4 (m-3) fractures, then this element lost efficacy, do not generate heat, and electric current can borrow equipotential line to be circulated to next section R5 (m-3) and the final power cathode that arrives, make other sections heating power as usual, reduced the operating efficiency loss of entire product.

Effect analysis:

Calculate because behind R4 (m-3) element failure variable power of the embodiment of the invention below:

During each conductive unit operate as normal, the operating power of the embodiment of the invention is:

$W=\frac{V_2}{\frac{\mathrm{nR}}{m}}=\frac{m}{n}\·\frac{V^2}{R}$

Wherein: V is a supply voltage;

R is the resistance value of each matrix element;

N is the matrix element number that every strip metal film lines are cut apart;

M is the sum of the metallic film lines of parallel connection, also is the line number of matrix;

W is the gross power of the embodiment of the invention.

After R4 (m-3) matrix element opened circuit, its power was:

$R^{\′}=\frac{3R}{m}+\frac{R}{m-1}+\frac{(n-4)R}{m}$

$=\frac{3(m-1)R+\mathrm{mR}+(m-1)(n-4)R}{m(m-1)}$

$=\frac{1+n(m-1)}{m(m-1)}\·R$

Wherein: R ' is the all-in resistance after R4 (m-3) opens circuit;

W ' is R ₄(m-3) gross power after opening circuit;

$W^{\′}=\frac{V^2}{\frac{1+n(m-1)}{m(m-1)}\·R}$

$\frac{W^{\′}}{W}=\frac{V^2}{\frac{1+n(m-1)}{m(m-1)}\·R}/\frac{m}{n}\·\frac{V^2}{R}$

$=\frac{m(m-1)}{1+n(m-1)}\·\frac{n}{m}$

$=\frac{n(m-1)}{1+n(m-1)}$

The metallic film lines of supposing each conductive unit have 300 isopotential points, are about to whole piece metallic film lines and are divided into 300 matrix elements (n=300), and 10 conductive units are one group (m=10)

Then $W^{\′}=\frac{300(10-1)}{1+300(10-1)}=\frac{2700}{2701}=0.99963W$

Its power only reduces 1-0.99963=0.00037 doubly.

Then behind R4 (m-3) element failure, whole piece metallic film lines all lost efficacy prior art, and its power is $\frac{m-1\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="S2008100104626E00011.png"\; state="\{\{state\}\}">V</figure-callout>}}^2}{\mathrm{nR}}$ Promptly equal $\frac{m-1}{m}\&CenterDot;W=0.9W,$ Its power reduces 1-0.9=0.1 doubly.

Promptly under equal conditions, the present invention can reduce the operating efficiency loss of entire product.

Claims (2)

1. matrix wiring type metal electric heating membrane, insulation film is arranged, between insulation film, be equipped with a plurality of conductive units, each conductive unit constitutes by strip metal film lines, the two ends of metallic film lines join with positive and negative power line respectively, it is characterized in that: be connected to many equipotential lines between each adjacent conductive unit, the isopotential point of the two ends of every equipotential line and two strip metal film lines joins.

2. matrix wiring type metal electric heating membrane according to claim 1 is characterized in that: described metallic film lines are back and forth controlled, and described equipotential line is connected on the close flex point of described metallic film lines.

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