JPS6232027Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flexible electric heating device, such as an electric soft anchor or an electric cushion, in which a heating element is interposed in a so-called flexible cushion material.

The structure of a conventional flexible electric heating device is as shown in FIG.

That is, in this FIG. 2, 1, 1 is a flexible cushion material, and in this flexible cushion material 1, 1, a cord type heating wire 3 is placed on a flexible sheet.
It is constructed by interposing heating units arranged in a zigzag pattern. Further, in this figure, reference numeral 4 denotes a safety device consisting of a thermostat or a temperature fuse, and this safety device prevents the temperature of the heating wire 3 from rising.

In the case of this conventional structure, heating wires are distributed throughout the heating appliance, so considering its safety, it is necessary to install a large number of safety devices 4 to prevent local abnormal temperature rises. This is not possible and is extremely dangerous. However, such flexible heating devices are designed to minimize the sensation of foreign bodies, so the number of safety devices and their placement positions are limited, and usually around two are installed as shown in Figure 2. is common sense,
From a safety standpoint, it could be said to be a very dangerous product.

The present invention has been made in view of the above, and aims to provide a highly safe flexible electric heating device, and in order to achieve this purpose, a flexible heat diffusion plate with good thermal conductivity is used as a heating element unit. A heating unit is made by fitting a sheet-like film made of a less flexible heat conductor with multiple heat radiation holes, and a heating element is closely attached to a local part of a heat diffusion plate, and a heating wire is spread throughout the heating equipment. The configuration is such that no

In this way, safety can be maintained by placing a safety device only near the heating element installed locally on the heat diffusion plate, resulting in an extremely reliable product, and at the same time, heating wires can be placed throughout the heating device. First, it becomes possible to make the temperature distribution on the heating surface uniform.

An embodiment of the present invention will be described below with reference to FIG. Reference numeral 5 denotes a flexible heat diffusion plate which is a good thermal conductor, and is made of, for example, a laminated thin plate of copper or aluminum, or a thin plate formed by braiding a copper foil strip or an aluminum foil strip. 6 is a heat diffusion plate 5
The heating element has a sufficiently smaller area and is closely attached to a local part of the heat diffusion plate 5 via the substrate 7. Reference numeral 8 denotes a sheet-like film that is less flexible than the heat-diffusing plate 5, such as a nylon film or a polypropylene film. , the heating element 6 is brought into direct contact with the metal foil at the same location.

The sheet-like film 8 is provided with a plurality of circular heat dissipation holes 9 in which the area per unit area of the peripheral portion is larger than the area per unit area near the heating element. Various combinations of the size and number of the heat radiation holes are selected in order to make the temperature distribution on the heating surface uniform. Further, the sheet-like film 8 is attached to the heat diffusion plate 5.
By using a less flexible material and increasing the bending radius of the heat diffusion plate 5 when bending force is applied to the heating unit, fatigue of the heat diffusion plate 5 can be reduced and permanent bending can be prevented. It is prevented. Reference numeral 4 designates a safety device such as a thermostat or temperature fuse provided on the substrate 7 near the heating element 6, and 10 represents a cover that covers the heating element 6 and the safety device 4. 11 is a power cord for energizing the heating element 6, and the cord arm 1 is connected from the bent part of one end of the board 7.
It is pulled out via 2. The heat generating unit and the safety device 4 are interposed between the flexible cushion materials 1, 1 to constitute a flexible electric heating device. Note that 13 in the figure is a front cover.

The present invention has the above-mentioned configuration, and when the heating element 6 is energized, the heating element 6 generates heat, and the heat is diffused by the heat diffusion plate 5. The temperature of the heat diffusion plate 5 is high near the heating element 6, and the temperature tends to decrease toward the periphery of the heat diffusion plate 5. Since the area of the heat dissipation holes provided in 8 becomes larger as it goes toward the periphery of the heat diffusion plate, the amount of heat radiated from each heat dissipation hole and reaching the heating surface through the cushion material is uniform, and the temperature of the heating surface is becomes uniform. This results in a flexible electric heating device that feels as if the heating element 6 is disposed throughout.

According to the present invention, the heating element 6 is the thermal diffusion plate 5.
Since the safety device 4 is also placed in a very small part of the heating element 6, there is no feeling of a foreign body, and even if the heating element 6 becomes abnormally heated, the safety device 4 is placed near it. Therefore, the safety device 4 operates reliably, resulting in a flexible electric heating device that is very safe and comfortable to use. Furthermore, according to the present invention, unlike conventional heating devices, the heating wire is not distributed throughout the heating device, so there is no problem of wire breakage due to bending.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a flexible electric heating device according to an embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view of the conventional heating device. 1... Flexible cushion material, 5... Heat diffusion plate, 6...
Heating element, 8... Sheet film, 9... Heat radiation hole.

Claims (1)

[Scope of utility model registration request] A heat diffusion plate 5 made of a flexible good heat conductor is interposed with a sheet-like film 8 made of a less flexible heat conductor, and a heating element 6 is brought into close contact with a local part of the heat-diffusion plate 5. 8 is provided with a plurality of heat dissipation holes 9 in which the heat dissipation hole area per unit area in the peripheral portion is larger than the heat dissipation hole area per unit area in the vicinity of the heat generating element 6, and these heat generating element units are made of a flexible cushion material. 1. A flexible electric heating device constructed by being interposed in 1.