JPH0866299A - Rice cooking vessel for electromagnetic heating rice cooker - Google Patents

Abstract

PURPOSE: To provide the rice cooking vessel with which durability is provided and further uniform temperature distribution can be provided. CONSTITUTION: Concerning an electromagnetic heating rice cooker for heating a rice cooking vessel 1 provided at the upper part of an electromagnetic induced heating coil 5 with joule heat caused by an eddy current corresponding to that electromagnetic induced heating coil, the rice cooking vessel 1 is formed by aluminium and aluminium alloy, a heat generating layer 2 is provided on the outside bottom surface and side surface lower outer periphery of this rice cooking vessel 1, and a temperature detecting part 3 composed of a circular non-heat generating layer is provided at the central part of the outside bottom. Besides, the bottom of the rice cooking vessel 1 is made thick, roundness R of a radius from 20mm to 30mm is added to the corner parts of the bottom surface and the side surface part, and the side surface part is made thin gradually toward the upper part. Further, a rib 7 is provided at the outer periphery of the temperature detecting part 3 at the center of the outside bottom, a rib 6 is provided at the outer periphery of the bottom part, and a groove 8 is provided on a boundary surface between the upper edge of the heat generating layer 2 at the outer periphery of the lower part of the side surface and a side surface 1b above that. Thus, temperature distribution on the bottom surface of the vessel is made uniform, durability is improved and performance can be stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooking container suitable for use in a commercial electromagnetic heating rice cooker.

[0002]

2. Description of the Related Art An electromagnetic cooker cooks rice by heating a rice cooking container installed above the electromagnetic induction heating coil with Joule heat generated by an eddy current. Generally, as this type of rice cooking container, a magnetic container made of iron, SUS430 series stainless steel or the like is widely used, but it is heavy and has a problem in handling when used as a commercial electromagnetic heating rice cooking container.
Further, the heat conduction is low and the temperature unevenness is apt to occur, so that it is unsuitable as an electromagnetic heating rice cooking container for business use which requires more uniform heating. Especially for business use, a lightweight rice cooking container that can be uniformly heated is required. An aluminum container is a rice cooking container that satisfies this requirement. However, since the aluminum rice cooking container itself is a non-magnetic material and is not heated by induction,
A magnetic iron or SUS430-based stainless steel plate is attached to an aluminum rice cooking container by brazing and used. Further, as a method of attaching a magnetic body to an aluminum rice cooking container, there is a thermal spraying method that can be easily attached to various shapes. As a method of attaching a magnetic material to this aluminum rice cooking container by thermal spraying, conventionally,
Preliminarily provided with an inclined groove on the outer bottom of the aluminum container to spray iron to prevent it from peeling (Jitsuko Sho6)
No. 1-27107) or a magnetic material such as iron is provided in a thickness of 0.33 to 0.80 mm on the bottom of an aluminum container by thermal spraying, and an aluminum layer is 0.6 by thermal spraying on the surface of the magnetic material.
There is proposed a device which is formed to have a thickness of 2 to 0.20 mm to prevent rust and improve heat generation efficiency (Japanese Utility Model Publication No. 3-38798).

[0003]

The method of brazing an iron or stainless steel plate to a heating container made of aluminum has a problem that the size and shape of the heating container are limited and peeling occurs. Further, the method of forming an inclined groove on the outer bottom portion of the aluminum container and spraying iron therewith involves manufacturing difficulties in providing a large number of inclined grooves. Furthermore, it is difficult to control the aluminum layer with a magnetic material and aluminum layer on the bottom of the aluminum container, and if it is thin, abnormal heat will occur,
In addition, if it is thick, there is a problem that it does not generate heat.

[0004]

Therefore, in the present invention, the production of rice for electromagnetic heating is simple, the output required for electromagnetic induction heating is easily obtained, and the temperature distribution of the rice cooking container is uniform and the control is accurate. A container is provided.

As a concrete means thereof, the present invention forms a rice cooking container from aluminum or an aluminum alloy, and provides a heating layer on the outer bottom surface and side surface lower periphery of the rice cooking container,
A circular temperature detecting part consisting of a non-heating layer is provided in the center part of the outer bottom part, the bottom part of the rice cooking container is made thicker, and the corner parts of the bottom and side parts are rounded with a radius of 20 mm to 30 mm. Is thinner toward the upper part, and further ribs are provided on the outer circumference of the temperature detection part at the center of the outer bottom part and the outer circumference of the outer bottom face,
Further, a groove is provided on the boundary surface between the upper end of the heat generating layer on the outer periphery of the lower portion of the side surface and the side surface above it.

[0006]

According to the above construction, a stable heat generating layer is provided on the outer bottom surface and the outer periphery of the lower side surface of the aluminum rice cooking container used for the electromagnetic heating rice cooker, and the thickness of the bottom surface is large and the corner portions of the bottom surface and the side surface portion are also formed. Since a radius of 20 mm to 30 mm is added to increase the effective area heated by the electromagnetic induction heating coil, rice can be cooked with a uniform temperature distribution. In addition, since the heat generating layers are separated on the outer periphery of the temperature detection unit at the center of the outer bottom of the rice cooking container and the outer periphery of the outer bottom, respectively, so as to withstand the difference in thermal expansion,
The durability can be improved.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows an example of a rice cooker for business use, and a case 9
There are moving rails 10 on both left and right sides inside, and this rail 1
The rice cooking container 1 is placed on top of 0 so that it can be moved back and forth. An operation panel 11 is provided on the front surface of the case 9 so that rice cooking conditions can be set. Reference numeral 5 denotes an electromagnetic induction heating coil, which is installed on the lower surface of the rice cooking container 1 and has a sensor 12 attached to the center thereof. Reference numeral 13 is a door that opens and closes the front opening of the case 9.

Next, FIG. 2 shows a cross-sectional view of a rice cooking container for an electromagnetic heating rice cooker. Reference numeral 1 is a rice cooking container, which is molded using aluminum or an aluminum alloy. In this rice cooking container, the wall thickness of the bottom surface 1a is increased to increase the heat capacity, and the side surface 1b is increased.
In order to reduce the weight by making the upper part lighter, the corners of the bottom face and the side face are provided with a radius R of 20 mm to 30 mm to increase the heating area and increase the effective heating area for the electromagnetic induction heating coil 5. The reason why the radius R is changed from 20 mm to 30 mm is that if the radius is 20 mm or less, molding is difficult, and if the radius is 30 mm or more, the flat surface portion of the bottom surface becomes small. Further, this container 1 is made of iron, 13Cr from the outer bottom surface to the rising portion (about 50 mm in height) of the outer periphery of the lower side surface.
And a heating layer 2 made of a ferrite material such as 18Cr stainless steel. In order to easily generate an eddy current required for induction heating, the heat generation layer 2 needs to be continuously connected without including an oxide film in the metal powder,
Therefore, it is formed by thermal spraying in an inert gas atmosphere.

Reference numerals 6 and 7 denote ribs, which are provided on the outer periphery of the temperature detecting portion 3 at the outer center of the rice cooking container 1 and on the outer periphery of the outer bottom surface, respectively, and separate the heat generating layer 2 into the outer bottom surface of the container 1 and the outer periphery of the lower side surface. Care is taken to protect against the difference in thermal expansion and to prevent the exothermic layer 2 from peeling even if the container is roughly handled. Reference numeral 8 denotes a groove provided on the boundary surface between the upper end of the outer periphery of the lower side surface of the rice cooking container 1 and the side surface 1b above it. The temperature detection unit 3 includes a heating layer 2 in order to accurately detect the temperature of the bottom surface of the rice cooking container 1.
Is not provided, and the sensor 12 is brought into close contact with this surface.
Reference numeral 5 is a coil support plate to which the electromagnetic induction heating coil 5 is attached.

In the above embodiment, the door 13 on the front of the case is opened, the rice cooking container 1 containing rice and water is placed on the moving rail 10 and pushed into the case 9, and the door 13 is closed to operate the operation panel 11. To do. As a result, an eddy current is generated between the electromagnetic induction heating coil 5 and the heating layer 2 of the rice cooking container 1 to heat the rice cooking container 1 with Joule heat to cook rice.

During this rice cooking, the rice cooking container 1 is provided with a heat generating layer 2 on the outer bottom surface and the outer periphery of the lower side surface, and the thickness of the bottom surface is large, and the corners of the bottom surface and the side surface have a radius of 20 mm.
Since the roundness R of 30 mm is provided, the effective area heated by the electromagnetic induction heating coil 5 is increased and rice can be cooked with a uniform temperature distribution.

Also, two ribs 6 and 7 provided on the rice cooking container 1
The groove 8 prevents the exothermic layer 2 from peeling off due to thermal expansion, and stable rice cooking can be obtained. The ribs 6 and 7 can also be used to take out the rice cooker container 1 to the front side after completion of rice cooking or to carry the rice. Can be prevented.

[0013]

EFFECTS OF THE INVENTION According to the present invention, an easy-to-handle aluminum rice cooking container is used, and the heat generating layer made of a magnetic material such as iron powder is formed on the outer bottom surface and the outer periphery of the lower side surface of the aluminum rice cooking container. The container can easily obtain a predetermined output. In addition, since a groove is provided on the side surface of the rice cooking container and two ribs are provided on the bottom surface to separate the heat generating layer, it is possible to withstand thermal expansion and maintain stable performance. Further, a circular rib is provided at the center of the outer bottom portion of the rice cooking container, and the temperature detection portion of the non-magnetic material portion is provided inside, so that the temperature detection is accurate. Furthermore, since the bottom of the rice cooking container is thick and the roundness R with a radius of 20 mm to 30 mm is provided at the corners from the bottom to the side, the effective heating area can be expanded, and as a result, the temperature distribution on the bottom of the container becomes uniform and delicious. It is possible to provide an electromagnetic cooking rice container that can cook rice.

[Brief description of drawings]

FIG. 1 is a perspective view of an electromagnetic heating rice cooker according to the present invention.

FIG. 2 is a cross-sectional view of a rice cooking container for an electromagnetic cooker according to the present invention.

[Explanation of symbols]

 1 Aluminum container 2 Heating layer 5 Electromagnetic induction heating coil 6, 7 Rib 8 Groove

Claims (1)

[Claims] 1. An electromagnetic heating rice cooker which heats a rice cooking container (1) provided on an upper portion thereof in correspondence with an electromagnetic induction heating coil (5) by Joule heat by eddy current, wherein the rice cooking container (1) is made of aluminum or Molded with an aluminum alloy, the rice cooker (1) is provided with a heat generating layer (2) on the outer bottom surface and the outer periphery of the lower side surface, and a temperature detecting portion (3) including a circular non-heat generating layer is provided at the center of the outer bottom portion. In addition, the bottom of the rice cooking container (1) has a large thickness, the bottom and side corners have a radius (R) with a radius of 20 mm to 30 mm, and the side has a thinner wall at the upper part and the outer bottom part. Ribs (7) and (6) are provided on the outer circumference of the central temperature detection unit (3) and the outer circumference of the outer bottom surface, respectively, and the boundary between the upper end of the heat generating layer (2) on the lower outer circumference of the side surface and the side surface (1b) above it. Characterized in that a groove (8) is provided on the surface Rice cooker for electromagnetic heating rice cooker.