JPH0650291U - Sheet heating element - Google Patents

Abstract

(57) [Summary] [Object] To provide a planar heating element in which a strip electrode is not deformed by thermal expansion and contraction and always maintains a flat shape. [Structure] A strip-shaped electrode 3 connected to a resistance heating wire 2 fixed to a heat-resistant sheet 1 is provided on both side edge surfaces of the heat-resistant sheet 1,
These are planar heating elements whose upper and lower surfaces are covered with a laminate film 5, and spacers 4 or cover bodies are provided on both sides of the strip electrode 3 so that the strip electrode 3 and the laminate film 5 are not adhered to each other. And

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a planar heating element. More specifically, the present invention relates to an electric heating type sheet heating element useful for a floor heating system of a house or a wall heating system.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, an electric heating type planar heating element has been used for a panel heater that constitutes a floor heating system of a house or the like. 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 bonded or sewn and fixed. Furthermore, a strip 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 laminated from both upper and lower sides with a laminated film (d) such as polyethylene. It has a fixed structure.

[0003]

[Problems to be solved by the device]

 However, in the case of the conventional sheet heating element (e) having the structure illustrated in FIG. 5, the strip electrode (c) is directly attached as shown in FIG. Since it is covered and fixed by the laminate film (d), the strip-shaped electrode expands and contracts due to the heat when the laminate film (d) is coated, and as a result, the sheet heating element (e) bends and the strip-shaped electrode is bent. There was a problem that stress was concentrated on a part of (c), or the entire planar heating element (e) was deformed into a wavy state as shown in FIG. 7. In particular, when the sheet heating element (e) is deformed into a corrugated shape, as shown in FIG. 8, when it is brought into close contact with a heat equalizing material (f) such as a metal plate, a gap portion is generated, There are also inconveniences such as a significant decrease in heat transfer efficiency.

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.

[0005]

[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 whose upper and lower surfaces are covered with a laminate film. A planar heating element, characterized in that spacers are arranged on both sides of the strip electrode so that the strip electrode and the laminate film are not adhered to each other. Further, this invention has a strip-shaped electrode 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 covered with laminating films on both upper and lower sides of the strip-shaped heating element. There is also provided a planar heating element characterized in that a cover body is provided on the electrode and the strip electrode and the laminate film are in non-contact with each other.

Further, in the above-described sheet heating element in which the strip electrode and the cover body are arranged, it is preferable that the strip electrode and the cover body are bonded and integrated with silicon rubber.

[0007]

[Action]

 In the planar heating element of this invention, the strip electrodes connected to the resistance heating wires are not directly fixed by the laminating film, but spacers are arranged on both sides of the strip electrodes or the strip electrodes are covered with a cover body. Cover the laminated film as it is. For this reason, the strip electrode can freely expand and contract between the spacers or in the cover body even when heat is generated during coating, and the planar heat generating element is not deformed.

[0008]

【Example】

 Embodiments will be described below with reference to the accompanying drawings, and the planar heating element of the present invention will be further described in detail. FIG. 1 is an exploded perspective view of an essential part showing an embodiment 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 adhering or sewing. A strip electrode (3) such as a copper plate that conducts electricity to 2) is arranged on both side edge surface heating elements of the heat resistant sheet (1). In the case of the planar heating element illustrated in FIG. 1, spacers (4) are fixed on both sides of the strip electrode (3) and they are covered with a laminated film (5) such as polyethylene from the upper and lower sides. .

FIG. 2 is a side sectional view of the main part of the planar heating element illustrated in FIG. As illustrated in FIG. 2, the strip electrode (3) is not in contact with the laminate film (5) covering the upper surface of the strip electrode (3) and can freely expand and contract between the spacers (4). The planar heating element can always maintain a flat shape. FIG. 3 is a side sectional view of a main part showing another embodiment of the present invention.

For example, in the case of this sheet heating element, the strip-shaped electrode (3) arranged on the heat-resistant sheet (1) is covered with the cover body (6), and the cover body (6) is bonded to the heat-resistant sheet (1). In the fixed state, the upper and lower surfaces are covered with a laminate film (5). Also in this case, the strip electrode (3) can be freely expanded and contracted within the cover body (6).

FIG. 4 is a side sectional view of a main part showing still another embodiment of the present invention. For example, in the case of the sheet heating element shown in FIG. 4, the strip electrode (3) and the cover body (6) covering the strip electrode are bonded and integrated with silicone rubber (7), and both sides of the cover body (6) are attached. Both upper and lower surfaces are covered with a laminate film (5) while being fixed to the heat-resistant sheet (1) by adhesion.

In this case, the strip electrode (3) is integrated with the cover body (6) by the silicone rubber (7), but the silicone rubber (7) can absorb the expansion and contraction of the strip electrode (3). Therefore, the strip electrode (3) does not change due to heat generation. Further, as illustrated in FIG. 4, the belt-shaped electrode (3) and the cover body (6) are integrated by the silicon rubber (7), so that they are formed on the heat-resistant sheet (1) in one step. It can be arranged and fixed, which facilitates manufacturing.

Of course, the present invention is not limited to the above examples, and it goes without saying that various aspects are possible in details.

[0014]

[Effect of device]

 As described in detail above, according to the present invention, a planar heating element that does not undergo deformation due to expansion and contraction of the strip electrode and has excellent thermal conductivity for always maintaining a flat shape is provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment using a spacer of the present invention.

FIG. 2 is a side sectional view of a main part of the planar heating element shown in FIG.

FIG. 3 is a side sectional view of an essential part showing another embodiment using the cover body of the present invention.

FIG. 4 is a side sectional view of a main part showing still another embodiment in which the cover body of the present invention is attached via silicon rubber.

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

[Explanation of symbols]

 1 Heat-resistant sheet 2 Resistance heating wire 3 Band electrode 4 Spacer 5 Laminated film 6 Cover body 7 Silicon rubber

Claims (3)

[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 the upper and lower surfaces thereof being covered with a laminate film. A planar heating element, characterized in that spacers are arranged on both sides of the strip-shaped electrode so that the strip-shaped electrode and the laminate film are not adhered to each other. 2. A planar heating element having strip-shaped electrodes connected to resistance heating wires fixed to a heat-resistant sheet on both side edge surfaces 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 cover body is provided on the sheet, and the strip electrode and the laminate film are in a non-contact state. 3. The planar heating element according to claim 2, wherein the strip electrode and the cover body are bonded and integrated with each other by silicone rubber.