JPS5919343Y2 - Lead wire extraction structure of planar heating element - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lead wire extraction structure for a planar heating element.

Current-carrying conductors (
It is known that the heating element (heating element) and the electrodes at both ends thereof are insulated by a heat-resistant plastic film or sheet.

In the installation of such planar heating elements, it may be necessary to attach lead conductors to the electrodes on site, and one method of such attachment is to partially expose the electrodes by removing the plastic film or sheet. A lead wire is soldered to this exposed portion, and a hardening insulating material such as epoxy resin is applied to the soldered portion to insulate the soldered portion and mechanically protect it from the tensile force acting on the lead wire. is possible.

However, in order to provide this mechanical protection, the thickness of the epoxy resin must be considerably increased, which results in poor heat dissipation at the soldered joints and increased thermal resistance. may lead to abnormal fever (horatos hot).

The lead wire extraction structure of the planar heating element according to the present invention has a configuration that can eliminate the above-mentioned disadvantages, and is a planar heating element in which the current-carrying conductor and the electrode at the end of the current-carrying conductor are insulated with a heat-resistant plastic film or sheet. The plastic film or sheet protrudes like an ear from the end near the electrode, the electrode is partially exposed by removing the plastic film or sheet, a lead wire is soldered to this exposed part, and the soldered part is is insulated with a sealant, and a lead wire is individually attached to the ear portion with a binder.

The present invention will be explained below with reference to the drawings.

FIG. 1A is a top explanatory view of the lead wire extraction structure according to the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A.

In FIG. 1A and FIG. 1B, 1 is a planar heating element, which is coated with a carbon-containing conductive paint on a heat-resistant nonwoven fabric.
The impregnated conductor 11 is provided with an electrode 12 made of copper foil or the like, and these are insulated from above and below with a heat-resistant plastic film or a sheet 1-13.13.

This heat-resistant plastic film or sheet 13.13
has ears 131 and 131 in the vicinity of the electrode, and the ears 130 are formed by overlapping these ears 131, 131.

2 is a power supply lead wire, and the conductor at the end of the lead wire is connected to the electrode portion 1 exposed by partially removing the insulator.
The soldered portion 3 is insulated with a sealant 4 such as silicone rubber.

This lead wire 2 is attached to the surface of the ear portion 130,
It is fixed to the ear part 130 with a binder 5 made of an adhesive sheet or tape.

As the binder 5, an adhesive tape, a self-fusing sheet or tape, a heat-sealing sheet or tape, a heat-shrinkable tube, a heat-shrinkable sheet, a metal strip compression clip, or the like can be used.

In the lead wire extraction structure of the sheet heating element according to the present invention, as described above, the ears are provided at the ends of the sheet heating element, and the lead wires are fixed to the ears with a binder, so that the lead wires can be easily attached to the lead wires. The fixing part can be subjected to an applied tensile force,
It is possible to prevent tensile force from acting on the soldered portion of the lead wire.

Therefore, the insulation of the soldered portion does not need to be able to bear a tensile force, and therefore, the thickness of the insulation can be reduced, and abnormal heat generation of the soldered portion can be prevented.

Furthermore, since the ears are made of an insulating film or sheet of the planar heating element and have flexibility, the second
As shown in the figure, even if the lead wire is pulled at a certain angle α, the ears are bent and deformed according to the angle α, thereby preventing the lead wire from being bent intensively.

Therefore, premature breakage due to concentrated bending of the lead wire can be prevented.

[Brief explanation of drawings]

FIG. 1A is a top explanatory view showing a lead wire extraction structure according to the present invention, FIG. 1B is a BB sectional view in FIG. 1A,
FIG. 2 is an explanatory diagram showing the tension state of the lead wire in the lead wire extraction structure same as above. In the figure, 11 is a current-carrying conductor, 12 is an electrode, 13.1
3 is an insulator, 130 is an ear portion, 2 is a lead wire, and 5 is a binder.

Claims (1)

[Scope of utility model registration request] The plastic film or sheet protrudes like an ear from the end near the electrode of a planar heating element in which a current-carrying conductor and an electrode at the end of the current-carrying conductor are insulated with a heat-resistant plastic film or sheet, and the electrode is insulated with a plastic film or sheet. Or a surface characterized in that the sheet is partially exposed by removing the sheet, a lead wire is soldered to this exposed part, the soldered part is insulated with a sealant, and the lead wire is individually fixed to the ear part with a binder. Lead wire extraction structure for shaped heating element.