JPH0644088U - Planar heater structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a structure of a planar heater which does not cause resistance resistance wire breakage or deformation due to thermal expansion and contraction thereof and is excellent in productivity. [Structure] Only the folded portion 3 of the resistance heating wire 2 having the meandering wiring is alternately sewn temporarily with a stretchable thread 4 at large and small pitches. The heat resistance sheet 1a has a heat resistance sheet 1b on the wiring surface thereof. The upper and lower surfaces are covered with a laminate film 6 in a state where they are overlapped with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a planar heater structure. More specifically, this consideration relates to an electrothermal planar heater structure useful as a component of a floor heating system or the like.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, an electrothermal sheet heater has been used for a panel heater or the like that constitutes a floor heating system or a wall heating system of a house or the like. In this sheet heater, for example, as shown in FIG. 6, a resistance heating wire (a) such as a nichrome wire is meandered on a heat-resistant sheet (a) such as kraft paper or cloth and sewn with a thread (c). Temporarily fix it, and then temporarily attach strip electrodes (d) such as a copper plate that conduct electricity to the resistance heating wire (a) to both side edges of the heat-resistant sheet (b), and laminate them from both upper and lower sides with polyethylene or the like. It has a structure in which it is covered and fixed with a film (e).

Such a planar heater has a structure in which even if the resistance heating wire thermally expands and contracts, the stress is relaxed and the heater is not deformed. That is, as shown in the cross-sectional view of FIG. 7, the resistance heating wire (a) is attached by the sewing thread (c) and is adhered by the laminating film (e), so it can be expanded and contracted to some extent. You can do it.

Further, the method of sewing the resistance heating wire (A) with the thread (C) is also devised, and for example, as shown in FIG. When the resistance heating wire (a) contracts by sewing the fixing part (c) of (c) so as to meander slightly, and the resistance heating wire (a) shrinks as shown in Fig. 8 <b>. ) Is reduced, and the seam of the thread (c) is also deformed, so that the stress can be relieved.

[0005]

[Problems to be solved by the device]

 However, in the case of the conventional planar heater in which the resistance heating wire (a) is sewn and temporarily fixed in this way, as shown in FIG. 7, the periphery of the resistance heating wire (a) is a thread (c). Since it is covered, the wiring portion of the resistance heating wire (a) has a protruding shape. Therefore, when a floor heating system is constructed using such a sheet heater, the impact from the floor is concentrated on the protruding resistance heating wire (a), and the resistance heating wire (a) is crushed. There was a problem that it was easy to break the wire.

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 heater and to alleviate the stress due to the thermal expansion and contraction of the resistance heating wire. The purpose of the present invention is to provide an improved planar heater structure in which external impact is less likely to concentrate on the resistance heating wire.

[0007]

[Means for Solving the Problems]

 This invention solves the above-mentioned problems by resistance heating of a heat-resistant sheet in which only the folded portion of the resistance heating wire that is meandering is sewn and temporarily fixed by elastic threads alternately at large and small pitches. (EN) Provided is a planar heater structure in which a heat-resistant sheet is superposed on the wire wiring surface and the upper and lower surfaces are covered with laminate films.

[0008]

[Action]

 In the planar heater structure of the present invention, the resistance heating wire, which is meanderingly wired, is sewn and temporarily fixed with a thread only at the folded back portion. As a result, there are few protrusions at the intersection of the resistance heating wire and the thread, which prevents external impacts from concentrating on the resistance heating wire, and the risk of disconnection is greatly reduced. In addition, productivity is improved by reducing the stitching section with thread.

Further, the resistance heating wires are sewn alternately with elastic yarns at large and small pitches, and the resistance heating wires temporarily fixed with the small-pitch yarns are automatically sewn inside the large-pitch yarns. Since it can be moved for any reason, the stress caused by thermal expansion and contraction is efficiently relieved.

[0010]

【Example】

 Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings, and the planar heater structure of the present invention will be described in more detail. FIG. 1 is an exploded perspective view showing an embodiment of the planar heater structure of the present invention. For example, in this sheet heater, a resistance heating wire (2) such as a nichrome wire is meanderingly wired on a heat-resistant sheet (1a) made of kraft paper or cloth, and only the meandering folded portion (3) is threaded (4). Then, the belt-shaped electrodes (5) such as a copper plate for energizing the resistance heating wire (2) are temporarily bonded to both side edge surfaces of the heat-resistant sheet (1a). Then, in the case of this invention, another heat-resistant sheet (1b) is overlaid on the wiring surface of the resistance heating wire (2), and these two heat-resistant sheets (1a) (1b) are placed on both upper and lower surfaces. It is covered and fixed with a laminated film (6) such as polyethylene.

FIG. 2 is a side sectional view of the area where the resistance heating wire (2) is linearly wired in this planar heater. As shown in FIG. 2, the linear portion of the resistance heating wire (2) is not sewn with a thread, so that the projection on the heater surface is small. Moreover, since the resistance heating wire (2) is covered with heat-resistant sheets (1a) and (1b) above and below and is not in direct contact with the laminating film (6), it can be freely expanded and contracted by heat. Wear.

On the other hand, FIG. 3 is a side sectional view of the planar heater at the folded portion (3) of the resistance heating wire (2). As illustrated in FIG. 3, the resistance heating wire (2) is sewn to the heat-resistant sheet (1a) alternately with the small-pitch thread (4a) and the large-pitch thread (4b) at the folded-back portion (3). Has been. The yarns (4a) and (4b) are made of a stretchable material such as polyurethane so that the resistance heating wire (2) fixed by the small-pitch yarns (4a) is By expanding and contracting the yarn (4a), the yarn (4a) can freely move in the space (7) formed by the large-pitch yarn (4b). Therefore, as shown in FIG. 5, even when the resistance heating wire (2) in the straight portion is hot-drawn, the response is absorbed by the folded portion (3) sewn by the threads (4a) and (4b). Since it is relaxed, the planar heater does not cause deformation such as waviness.

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

[0014]

[Effect of device]

 As described in detail above, the present invention provides a planar heater which is excellent in productivity without the resistance heating wire being broken or being deformed by its thermal expansion.

[Brief description of drawings]

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

FIG. 2 is a side sectional view of the sheet heater illustrated in FIG.

FIG. 3 is another side sectional view of the planar heater illustrated in FIG.

FIG. 4 is a side cross-sectional view illustrating a moving state of resistance heating wires in the planar heater illustrated in FIG.

5A and 5B are plan views each illustrating a moving state of a resistance heating wire in the planar heater according to the present invention.

FIG. 6 is an exploded perspective view illustrating a conventional planar heater structure.

FIG. 7 is a side sectional view of a conventional sheet heater.

8A and 8B are plan views each illustrating a sewing state of a resistance heating wire in a conventional sheet heater.

[Explanation of symbols]

 1a, 1b Heat-resistant sheet 2 Resistance heating wire 3 Folding part 4 Thread 4a Small pitch thread 4b Large pitch thread 5 Strip electrode 6 Laminated film 7 Space

Claims (1)

[Scope of utility model registration request] 1. A heat-resistant sheet is superposed on the resistance-heated wire wiring surface of a heat-resistant sheet in which only the folded-back portion of the resistance-heated wire having the meandering wiring is alternately sewn temporarily with a stretchable thread at a large and small pitch. A planar heater structure in which both upper and lower surfaces are covered with a laminate film in this state.