JPH07111939A - Insulating heater for electric rice cooker - Google Patents

Abstract

PURPOSE:To obtain an insulating heater for an electric rice cooker which achieves a stabilization of insulation temperature by arranging the insulating heater to be less affected by the mounting position thereof on a protective frame. CONSTITUTION:A protective frame 16 is mounted in a main unit 15 and a heater 17 and a pot 18 are arranged in the protective frame 16. An insulating heater is provided at an upper part of the external surface of the protective frame 16 with an aluminum foil by a sticking means of a back surface heat sensitive adhesive tape and the like and a thermal lead switch 20 for ON or OFF control of the energization of the insulating heater is arranged in proximity to the means. Numeral 31 indicates a heat sensing part of the thermal lead switch 20 which is formed in a shape of a cylinder and normally made of aluminum material to cover the outer circumference of the thermal lead switch. The insulating heater arranged on the outer circumference of the protective frame 16 is pressed with the aluminum foil with an adhesive and further fixed. The thermal lead switch 20 has a heat sensing part 31 with the width thereof almost the same as that of the aluminum foil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat retaining heater device for an electric rice cooker having a heat retaining function.

[0002]

2. Description of the Related Art Generally, an electric rice cooker is provided with a means for keeping the cooked rice warm. FIG. 4 shows an electric rice cooker provided with the heat retaining means. As shown in the figure, a protective frame 2 is provided in the main body 1, a heater 3 is provided in the protective frame 2, and a pot 4 is housed thereon. As the heat retaining means, a heat retaining heater 5 is provided on the outer surface of the protective frame 2,
A thermal reed switch 6 for controlling the energization of the heat retaining heater 5 is attached to the switch mounting base 7 so as to be located in the vicinity of the heat retaining heater 5. A heat insulating material 8 is provided between the protective frame 2 and the thermal reed switch 6.

Reference numeral 8 in the figure is a center thermometer provided at the center of the heater 3 for detecting the temperature of the bottom of the pot 4.
Is locked at the center thermo 8 at the tip and the operation button 1 at the other end
Rice cook lever having 0, 11 is a frame, 12 is a changeover switch for switching the circuit of rice cook through a rice cook lever 9 provided on the frame 11 and interlocking with turning on and off of the center thermo 8 and 13 is a temperature for preventing overheating. Hughes, 14
Is a rice cooking indicator.

[0004]

In the above structure, the positional relationship between the thermal reed switch 6 and the warming heater 5 affects the warming temperature of the rice, but the warming heater 5 is set at a predetermined position of the protective frame 2. It is difficult to attach the heater, and therefore, there are variations in the attachment position of the heat retaining heater 5 depending on the electric rice cooker, which causes a problem that the heat retaining temperature varies.

In view of the above-mentioned conventional problems, the present invention has as its first object to realize a warming heater device of an electric rice cooker capable of keeping warm at a predetermined temperature even if the mounting position of the warming heater on the protective frame varies. .

A second object is to obtain a heat retention heater device for an electric rice cooker in which the thermal reed switch is not easily affected by the temperature of the outside air even if the heat insulating material is removed and the heat retention temperature is stable.

A third object of the present invention is to obtain a heat retention heater device for an electric rice cooker in which the heat retention temperature is stable even if the heat retention heater is floating due to improper attachment.

[0008]

In order to achieve the above object, the present invention provides a heat retaining heater provided on an outer surface of a protective frame for accommodating a pot, the heat retaining heater, and a thermal control for controlling energization of the heat retaining heater. A reed switch and an aluminum foil that covers the heat retention heater and fixes the thermal reed switch to the outer surface are provided, and the heat retention heater and the thermal reed switch are connected via the aluminum foil.

[0009]

In the above structure, since the heat retention heater and the thermal reed switch are integrally formed via the aluminum foil, the heat of the heat retention heater can be efficiently transferred to the thermal reed switch, and the heat retention heater can be attached to the protective frame. Even if there is a large variation in the vertical direction, this variation will be absorbed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 3, a protective frame 1 is provided inside the main body 15.
6, a heater 16 and a pot 18 are provided in the protective frame 16. A heat retaining heater 19 is provided on the outer surface of the protective frame 16 by means of affixing means such as an aluminum foil 27 and a backside heat-sensitive adhesive tape, and a thermal lead for controlling ON / OFF of energization of the heat retaining heater 19 in the vicinity thereof. The switch 20 is arranged. Reference numeral 31 denotes a heat-sensitive portion of the thermal reed switch 20, which has a tubular shape and is usually made of an aluminum material and covers the outer periphery of the thermal reed switch 20.

In the figure, 2 is a rice cooking lever, 23 is an operation button, 24 is a changeover switch, and 26 is a lid.

A heat retaining heater 1 arranged on the outer periphery of the protective frame 16.
9 is fixed by aluminum foil 27 with an adhesive and further fixed. The thermal reed switch 20 has a heat sensitive portion 31 having substantially the same width as the aluminum foil 27.

Next, the operation of the above configuration will be described. First, the heat retaining heater 19 is fixed to the protective frame 16 with an adhesive agent or the like on the back surface of the aluminum foil 27. However, even if the heat retaining heater 19 is attached to the protective frame 16 in a large amount in the vertical direction, the heat of the heat retaining heater will be heat-sensitive. Heat is stably transferred to the thermal reed switch 20 via 31 and the heat retention temperature is stabilized. Further, if the width of the aluminum foil 27 is substantially the same as the width of the heat-sensitive portion 31, the heat is transferred more efficiently and the heat retention temperature control is further stabilized.

Further, since the heat is transferred through the aluminum foil even if the heat insulating material is removed, the thermal reed switch 20 can be made less susceptible to the temperature of the outside air, and the amount of heat transfer can be further stabilized.

Further, when the heat insulation heater 19 is attached, even if it is floated, heat is transferred through the aluminum foil, so that energization to the heat insulation heater is constant, and as a result, the heat insulation temperature can be stabilized. Of.

[0017]

As is apparent from the above description of the embodiments, the present invention has a structure in which the thermal reed switch and the heat retention heater are connected via the aluminum foil, so that the heat transfer amount is independent of the attachment position of the heat retention heater. Can be kept constant, and the heat retention temperature can be stabilized. That is, even if there is a large variation in the vertical direction, the attachment of the heat retention heater to the protective frame can absorb this variation and stabilize the heat retention temperature. In addition, when the heat-sensitive part of the thermal reed switch is covered with aluminum foil, the heat of the heat retention heater is directly transferred to the thermal reed switch even if the heat insulating material is removed or if it floats due to improper attachment, which results in It is less affected by temperature and the heat retention temperature can be stabilized.

[Brief description of drawings]

FIG. 1 is a plan view of a heat retaining heater device of an electric rice cooker according to an embodiment of the present invention.

FIG. 2 is a perspective view of the main part of the device.

FIG. 3 is a vertical cross-sectional view of a main part of an electric rice cooker using the same device.

FIG. 4 is a vertical cross-sectional view of an electric rice cooker using a conventional heater heater of the electric rice cooker.

[Explanation of symbols]

 16 Protective Frame 18 Pan 19 Insulation Heater 20 Thermal Reed Switch 27 Aluminum Foil 31 Heat Sensitive Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Yamane 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A heat retaining heater provided on an outer surface of a protective frame for accommodating a pot, the heat retaining heater, a thermal reed switch for controlling energization of the heat retaining heater, and a thermal reed switch covering the heat retaining heater and the thermal reed switch A heat retention heater device for an electric rice cooker, comprising: an aluminum foil fixed to an outer surface, and connecting the heat retention heater and the thermal reed switch to each other via the aluminum foil. 2. The heat retaining heater device for an electric rice cooker according to claim 1, wherein the heat sensitive portion of the thermal reed switch is covered with aluminum foil.