JPH01144591A - electric rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a cooking device for use in general homes, etc., which is equipped with an induction heating source and heats and cooks food placed in a pot.

2. Description of the Related Art As a cooking device equipped with an induction heating source and used to cook food in a pot, for example, one having the following structure is known. That is, in FIG. 2, 101 is a cylindrical outer case with open upper and lower surfaces, and a bottom plate 103 having support legs 102 is fixed to the lower surface of this case by screws. 1
04 is a pot accommodating part formed of heat-resistant plastic, for example, and a flange part 1o41 provided at the upper end thereof.
is fixed to the upper surface of the outer case 101 with screws. 105 is a first induction coil embedded in the side surface 104b of the pot storage section 104 by integral molding;
06 is a second induction coil embedded in the bottom part 104e of the pot storage part 104 by integral molding. 107
is a pot made of magnetic material, for example iron, and this is the pot storage part 104.
The sauce ζ is removably placed on the bottom part 104c.

Reference numeral 108 denotes a magnetic thermostat, for example, which is fixed through a support plate 109 in a through hole 104d provided at the center of the bottom portion 1o4c of the pot storage portion 104, and its heat-sensitive portion 108a is pushed upward by a spring (not shown). It is urged to come into close contact with the bottom surface 107b of the pot 107. Reference numeral 110 denotes a temperature detection switch having a heat sensitive part 110a, such as a thermistor, for detecting the temperature of the side face 107m of the pot 107. It is inserted into the insertion hole 111 and is always urged in the direction of the pot 107 by a spring 112, so that the tip of the heat sensitive section 1101 is pressed against the side surface 107& of the pot 107. Reference numeral 113 denotes a lid having a knob 114, which is removably placed on the flange 104a of the pot storage section 104.

Reference numeral 115 denotes a control board fixed to the upper surface of the bottom plate 103, on which a part of the electric circuit is disposed.

Problems to be Solved by the Invention In the above-mentioned conventional cooker, the pot housing section 104 is formed of heat-resistant plastic, and when the pot is kept warm, it is heated by induction coils 105 and 106.

However, in the cooker with the above structure, the side surface of the pot 107 is heated by the first induction coil 105 during warming, but in induction heating, the part facing the induction coil is heated intensively, so the first induction coil 105 heats the side of the pot 107. The heat insulating material in the portion facing the coil 105 dries out, and the other sides of the pot 107 are heated and are prone to condensation. In addition, induction heating is adjusted at the maximum output, and although it is efficient when cooking rice, it is very inefficient when the output is low, such as when keeping warm, and when keeping warm by heating with an induction coil, power consumption is high and economic efficiency is poor. There were other problems.

The present invention solves the above-mentioned problems, and aims to provide a cooking appliance equipped with an induction heating source that can heat evenly and economically when keeping warm.

Means for Solving the Problems In order to solve the above-mentioned problems, the cooking device of the present invention includes forming the bottom of the protective frame of the storage portion of the pot that accommodates the object to be heated in the cooking device main body from a non-metallic material. , the side part of the protective frame is formed of a metal material, and an induction coil is arranged at the bottom of the protective frame,
A resistance heater is installed on the side of the protective frame.

Function: In the above structure, the bottom of the protective frame in which the induction coil of the pot storage part is arranged is made of a non-magnetic, non-metallic material.
Induction heating of the pot can be performed smoothly, and a resistance heater is installed on the side of the protective frame made of metal material.
The heat generated by the resistance heater is dispersed by the high thermal conductivity of the metal material and the air layer between the pot and the side surface of the protective frame, and the side surface of the protective frame can be heated almost uniformly, reducing the risk of temperature fluctuations during heat retention. By using a resistance heater as the main heating source, which does not cause drying or dew condensation of the heat-retaining object and which is efficient in low-temperature heating during heat-retention, power consumption can be made appropriate and economical efficiency can be improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a sectional view showing a cooking device according to an embodiment of the present invention. In FIG. 1, inside the cylindrical cooking device main body 1, there is a storage area for the pot 2, a protective frame bottom part 3 and a protective frame side part 4.
and are arranged. The protective frame bottom 3 is made of a non-metallic material.
For example, it is made of thermoplastic plastic, and has an undercut receiver part A6 on its upper part that connects to the flange A5 on the bottom side of the protective frame side part 4, so that even non-metallic materials with low impact resistance can have a low bonding strength. They are connected face to face.

- The protective frame side part 4 is made of a metal material, for example, an aluminum-plated steel plate, and is provided with a flange A5 and a flange B7 at the bottom and the top, respectively, which receive strength from outward flanges, and the flange A5 is As shown, the holder of the bottom part 3 of the protective frame is connected to part A6, and the flange B7 is connected to the undercut part of the upper frame 8 to part B9. Said pot 2
is formed of, for example, a clad steel plate with a magnetic outer surface, and is supported by its pot flange 10 coming into contact with the upper frame 8. An induction coil 11 is arranged on the outer surface of the protective frame bottom 3 facing the bottom of the pot 2 to increase the cooling effect,
It is held between the protective frame cover 12 screwed to the protective frame bottom 3. A ferrite 13 is attached to the outer surface of the protective cover 12 to reduce inductive coupling and provide magnetic shielding to the outside. Here, the lowest part of the protective frame side part 4 and the highest part of the induction coil 11 are spaced apart from each other by 15 to 30 fl, so that the protective frame side part 4 is not abnormally heated due to induction heating, and is cost effective. In order to reduce the Further, on the outer surface of the protective frame side part 4, a heater A14, which is, for example, a coated and insulated resistance heater, is attached, and a temperature fuse 15, which is a heat-sensitive operating element that interrupts the circuit at abnormal temperature, is attached by a fixing metal fitting 16. . A heat insulating material 17 is filled between the outer case 1a of the cooker main body 1 and the protective frame side part 4, and above the induction coil 11 to improve heat retention performance and prevent the temperature of the outer case 1a from rising. .

A lid 18 made of resin is supported on the upper part of the upper frame 8 of the cooking device 1 via a pin 20 by a hinge part 19 integrally formed with the upper frame 8 so as to be openable and closable.

A handle portion 21 is provided on the top surface of the lid body 18, and an inner cover 22 is fixed to the inner surface via a heat insulating material 23. Further, an engaging portion 2 is integrally molded on the side opposite to the hinge portion 19 of the upper frame 8.
4, and an engagement lever 2 is provided on the lid body 18 opposite thereto.
5 is rotatably provided via a pin 26, and the lid body 18
When closed, the engagement lever 25 is biased by the spring 27 and engages with the engagement portion 24. When opening the lid 18, a button 28 attached to the engagement lever 25 is operated.

A support pin 2 is provided on the lower surface side of the inner cover 22 on the lower surface of the lid body 18.
9 is provided protrudingly, and the inner lid 30 is attached to this support pin 29 so as to be able to move up and down, and is always urged downward by the gasket 31, so that when the lid body 18 is closed, it comes into pressure contact with the pot 2 and closes the pot 2. I'm trying to do what I can. Further, on the upper surface of the inner cover 22, for example, a coated and insulated heater B32 is attached, and its lead wire is connected to an electric circuit (not shown) provided in the cooker main body 1 via a hinge part 19. .

The temperature of the steel 2 is sensed by a contact 33 that is in thermal contact with a thermistor (not shown) and is urged by a sensor spring 34 to contact the bottom of the pot 2.

The temperature information detected by the thermistor is transmitted through an electric circuit (not shown).
and controls the power of the induction coil 11, heater A14, and heater B32.

In the cooker having the above structure, for example, when cooking rice, put an appropriate amount of rice and water into the pot 2 and press a switch on the operation panel (not shown) to turn on the power.

By thermistor temperature sensing and electrical circuit programming,
Induction coil 11, heater A14 and heater B32
You can control the power to cook rice and keep it warm. Since the protective frame bottom 3 on which the induction coil 11 is disposed is made of non-magnetic thermoplastic, the pot 2 can be heated by induction smoothly. In addition, the heater A14, which generates Joule heat using a resistance heater, is attached in contact with the protective frame side part 4 formed of an aluminum-plated steel plate. The air layer between the side surfaces of the frame effectively disperses the heat and heats the sides of the pot 2 almost uniformly, making it possible to prevent rice from drying out or condensing due to temperature unevenness, for example, when keeping rice warm during cooking. In addition, when heating the pot 2 at a low temperature such as when keeping it warm, the induction coil 1
It is not necessary to absorb the low efficiency of induction heating at low output due to the induction coil 11, or to perform induction heating by the induction coil 11, and the power consumption can be reduced, resulting in excellent economic efficiency. Furthermore, the outer periphery of the protective frame side part 4 is filled with a heat insulating material 17 such as glass wool, and the protective frame bottom part 3 is made of thermoplastic plastic with low thermal conductivity.
Since it is made of PS or reinforced nylon, the induction coil 1
There is little heat loss in induction heating by A1 and heating by heater A14, and the pot 2 can be heated efficiently, which is extremely economical.

Effects of the Invention As described above, in the cooking device of the present invention, the bottom portion of the protective frame of the storage portion of the pot that accommodates the object to be heated in the cooking device main body is formed of a non-metallic material, and the side portions of the protective frame are formed of a metallic material. By arranging an induction coil at the bottom of the protective frame and a resistance heater at the side surface of the protective frame, the heat generated by the resistance heater is transferred to the high thermal conductivity of the metal material on the side surface of the protective frame. - The pot is heated almost uniformly by diffusion through the air layer between the sides of the protective frame, and for example, when keeping warm, there is no temperature unevenness, and it is possible to prevent drying and condensation of objects to be kept warm, and to keep them warm. In low-temperature heating, such as when heating at low temperatures, by heating the pot using the entire side surface of the protective frame as a heat source that produces an efficient resistance heater, power consumption can be reduced and the pot is extremely economical.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a cooking device according to an embodiment of the present invention;
The figure is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Cooker body, 2... Pot, 3... Bottom of protective frame, 4... Side part of protective frame, 11... Induction coil, 1
4... Heater A (resistance heater), is... Lid body.

Claims (1)

[Claims] 1. A cooking device main body, a pot removably housed in the cooking device main body, and a lid body that covers the cooking device main body so as to be openable and closable, and the storing portion of the pot in the cooking device main body is made of a non-metallic material. A cooking appliance formed of a protective frame bottom part made of a material and a protective frame side part made of a metal material, an induction coil disposed at the protective frame bottom part, and a resistance heater disposed on the protective frame side part. .