JPH037851B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tower kotatsu equipped with a surface heating element at the bottom of the top plate.

As shown in Fig. 1, a conventional Yagura Kotatsu of this type has a lamp-type heating element 1 attached to the top plate 3 of the Yagura Kotatsu together with a protection card 2, is installed with legs 4, and is attached to a futon 5 and a table. 6 could be used on top of it. In this case, since the heating element 1 reaches a relatively high temperature, a certain distance from the top plate 3 is required, and the protection card 2 also needs to be provided at a distance. Therefore, the lower surface of the protection card 2 is installed in a state in which it protrudes downward considerably, which becomes a great hindrance when the user stretches his or her legs during actual use. In addition, in the conventional heating method that uses the heating element 1 at a high temperature, the part directly under the kotatsu gets too hot than necessary, and the heat transfer to the table 6 through the top plate 3 is large, so the table In some cases, thermal distortion of 6 was generated.

In order to solve these drawbacks of the conventional examples, the present invention uses a planar heating element to make the inside of the kotatsu larger, and uses a low-temperature radiation heating method to prevent heat loss and heat unevenness, further improving comfort and energy saving. The purpose is to improve the

To achieve this object, the present invention forms a square-shaped surface heating element having a plurality of inclined radiating surfaces, and attaches the surface heating element to the lower part of the top plate so that each inclined radiating surface faces outward. The basic configuration is to independently control the energization. With this basic configuration, the heating element inside the kotatsu has a small bulge, which improves the usability of the kotatsu by allowing you to stretch out your legs spaciously, and improves comfort by collecting heat using radiant heat. This has the effect of making it possible to save power by controlling the energization of each inclined radiating surface according to the current.

Embodiments of the present invention will be described below based on FIGS. 2 and 3.

In the figure, 7 is a surface heating element, and this surface heating element 7 has the shape of a square peg with a central part protruding from the peripheral part and four slanted radiating surfaces. It is installed with. 10 is a leg, 11 is a futon, and 12 is a table.

In this configuration, the surface of the inclined radiating surface of the surface heating element 7 is treated with a film having a high emissivity, so that radiant heat is efficiently released outward and downward. Therefore, the user's lower back and buttocks are warmer than before. In the conventional case, the temperature at point A shown in FIG. 2 was high, but with this configuration, the temperature is almost uniform, or rather, the temperature at point B is higher.

In addition, with this configuration, the user's feet and waist are directly warmed by low-temperature radiant heat, so if the temperature inside the kotatsu rises to a certain level, it will be sufficiently warm even if the electric capacity is reduced. Therefore, if each inclined radiating surface of the square-shape heating element 7 can be controlled independently, then for example, when a user enters only from position A in FIG. , B to D are not energized, and even if only the heating element in the A zone is energized, it is sufficiently warm for the above-mentioned reasons. If the energization zone is selected in accordance with the number and location of users in this manner, power saving effects can be expected.

When a PTC surface heating element having the characteristics shown in Fig. 5 is used as the surface heating element 7, it has a self-temperature control function, so there is no need for safety parts such as a thermostat or temperature fuse, resulting in a thinner body. A heating element can be configured. In addition, large capacity was introduced at the beginning of energization,
Additional features include improved startup characteristics and power consumption that automatically increases depending on the number of users (as the temperature inside the kotatsu falls).

The structure of the surface heating element 7 used in the present invention is as follows:
Shown in FIGS. 6 and 7. That is, since a flat plate is pressed into a square peg shape, a radial heating pattern is provided. Concentric electrodes 14 are arranged on the substrate surface 13, and a heating element film 15 is formed between them. In particular, in FIG. 7, the electrode pattern is divided into four zones, and the electrode pattern is more complicated than the above. In FIGS. 6 and 7, a voltage is applied between points a and b of the electrode 14.

As explained above, the tower kotatsu of the present invention has a devised configuration of the surface heating element, which improves the performance in use and increases the power saving effect by switching the energized zones, and is of great value.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional Yagura kotatsu, Figure 2 is a configuration diagram of a Yagura kotatsu according to an embodiment of the present invention, Figure 3 is a perspective view of the surface heating element of the Yagura kotatsu, and Figure 4 is a diagram of the configuration of a conventional Yagura kotatsu.
The figure is a perspective view of the same tower kotatsu, FIG. 5 is a resistance-temperature characteristic diagram of the surface heating element, and FIGS. 6 and 7 are internal views of the surface heating element used in the tower kotatsu of the present invention. 7... Surface heating element, 8... Top plate, 9... Protective guard, 10... Legs.

Claims (1)

[Claims] 1 A pyramid-shaped surface heating element having a plurality of inclined radiating surfaces is formed, and the surface heating element is attached to the lower part of the top plate so that each inclined radiating surface faces outward, and each inclined radiating surface is independently energized. A controlled tower kotatsu.