JPH0587886U - Sheet heating element - Google Patents

Abstract

(57) [Summary] [Structure] The heat-resistant sheet 1 has strip electrodes 3 connected to the resistance heating wires 2 fixed on both sides of the heat-resistant sheet 1.
In the sheet heating element having the upper and lower surfaces thereof covered with the laminate film 4, the strip electrode 3 is wrapped in the folded portion 5 of the heat resistant sheet 1 in a non-adhesive state. [Effect] A planar heating element that does not deform due to expansion and contraction of the strip electrode and has excellent heat conduction efficiency.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet heating element. More specifically, the present invention relates to an electrothermal type sheet heating element useful for a floor heating system of a house or the like.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, an electrothermal type sheet heating element has been used for a panel heater or the like constituting a floor heating system or a wall heating system for a house, for example. For example, as shown in FIG. 5, this sheet heating element has a resistance heating wire (a) such as a nichrome wire patterned on a heat-resistant sheet (a) such as kraft paper or cloth and fixed by bonding or sewing. Further, a strip-shaped electrode (c) such as a copper plate that conducts electricity to the resistance heating wire (a) is temporarily adhered to both side edges of the heat-resistant sheet (a), and these are covered with a laminated film (d) such as polyethylene from the upper and lower sides. It has a fixed structure.

[0003]

[Problems to be solved by the device]

 However, in the case of the conventional planar heating element (e) having the structure illustrated in FIG. 5, the upper and lower surfaces of the strip electrode (c) are respectively arranged as shown in the side sectional view of FIG. Since it is bonded and fixed to the laminate film (d) and the heat-resistant sheet (a), when the strip electrode (c) expands and contracts due to the heat of the resistance heating wire (a), the laminate film (d) and The presence of the heat-resistant sheet (a) prevents its free expansion and contraction.

Therefore, for example, as shown in FIG. 7, the sheet heating element (e) is warped to concentrate stress on a part of the strip electrode (c), or as shown in FIG. 8, the sheet heating element (e). (E) There was a problem that the whole was deformed into a wavy state. In particular, when the planar heat-generating body (e) is deformed into a corrugated shape, if it is brought into close contact with a heat equalizing material such as a metal plate, a gap is generated as shown in FIG. It causes inconvenience such as a significant decrease.

The present invention has been made in view of the circumstances as described above, and it is possible to eliminate the drawbacks of the conventional planar heating element and to flexibly expand and contract the strip electrodes independently to transform the entire structure. It is intended to provide a sheet heating element that is difficult to do.

[0006]

[Means for Solving the Problems]

 This invention solves the above problems by providing strip electrodes on both side edges of the heat-resistant sheet, which are connected to the resistance heating wires fixed to the heat-resistant sheet, and the upper and lower surfaces of these electrodes are covered with a laminate film. A planar heating element comprising: a strip-shaped electrode, wherein the strip electrode is wrapped in a folded portion of a heat-resistant sheet in a non-adhesive state.

[0007]

[Action]

 In the planar heating element of the present invention, the strip-shaped electrode connected to the resistance heating wire is not adhered and fixed to the heat-resistant sheet and the laminate film as in the conventional case, but wrapped in the folded portion of the heat-resistant sheet in a non-adhesive state. This is covered with a laminate film from both upper and lower sides. For this reason, the strip electrode can freely expand and contract within the folded portion of the heat resistant sheet, stress is not concentrated on a part, and the planar heating element is not deformed.

[0008]

【Example】

 Hereinafter, embodiments will be shown with reference to the accompanying drawings to explain the present invention in more detail. FIG. 1 is an exploded perspective view illustrating a planar heating element of the present invention. For example, in this sheet heating element, a resistance heating wire (2) such as a nichrome wire is pattern-wired on a heat-resistant sheet (1) made of kraft paper or cloth and fixed by bonding or sewing. Strip-shaped electrodes (3) such as a copper plate for energizing 2) are arranged on both side edges of the heat resistant sheet (1). And in the case of this invention, both ends of the heat-resistant sheet (1) are folded back in the direction of the arrow in the figure without temporarily adhering the band-shaped electrode (3) to the heat-resistant sheet (1), and the band-shaped electrode (3) is In the state where it is wrapped, the upper and lower surfaces are covered with a laminated film (4) such as polyethylene.

FIG. 2 is a perspective view showing an embodiment of the sheet heating element of the present invention. As shown in FIG. 2, the strip electrode (3) is wrapped in the folded portion (5) of the heat resistant sheet (1), and only the heat resistant sheet (1) and the resistance heating wire (2) are laminated. It is covered and fixed by the rum (4). Therefore, as shown in the sectional view of FIG. 3, the strip-shaped electrode (3) is in a non-adhesive fixed state on both upper and lower surfaces thereof, and as shown in the perspective view of the main part of FIG. It can be freely expanded and contracted in the folded portion (5) of (1).

Therefore, the strip electrode (3) is not deformed by expansion and contraction, and the planar heating element itself always maintains a flat shape. Of course, the present invention is not limited to the above examples, and it goes without saying that various aspects are possible in the detailed configuration and the like.

[0011]

[Effect of the device]

 As described in detail above, according to the present invention, there is provided no deformation due to expansion and contraction of the strip electrode, and a sheet heating element excellent in heat conduction efficiency is provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view illustrating the structure of a planar heating element of the present invention.

FIG. 2 is a perspective view showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of the planar heating element illustrated in FIG.

FIG. 4 is a perspective view illustrating an arrangement state of strip electrodes in the planar heating element of the present invention.

FIG. 5 is an exploded perspective view illustrating the structure of a conventional sheet heating element.

FIG. 6 is a side sectional view of the planar heating element illustrated in FIG.

7 is a side cross-sectional view illustrating a deformed state of the planar heating element of FIG.

FIG. 8 is a perspective view illustrating another modified state of the sheet heating element of FIG.

FIG. 9 is a side view illustrating an installed state of a deformed sheet heating element.

[Explanation of symbols]

 1 Heat resistant sheet 2 Resistance heating wire 3 Strip electrode 4 Laminated film 5 Folded part

Claims (1)

[Scope of utility model registration request] 1. A planar heating element having strip-shaped electrodes connected to resistance heating wires fixed to a heat-resistant sheet on both side edges of the heat-resistant sheet and having upper and lower surfaces thereof covered with a laminate film. A sheet heating element, characterized in that a strip electrode is wrapped in a folded portion of a heat resistant sheet in a non-adhesive state.