JPH08103369A - Rice-cooking pot for electromagnetically induced heating rice-cooking device - Google Patents

Abstract

PURPOSE: To provide a rice-cooking pot which has durability and offers equal thermal distribution for a heating rice-cooking pot which is heated with electromagnetic induction. CONSTITUTION: In an electromagnetically induced heating rice-cooking in which a rice-cooking pot 1 placed above an electromagnetically induced heating coil 8 is heated by Joule heat due to an eddy current, the rice-cooking pot 1 is made of aluminum or aluminum alloy, heating layers 2a and 2b are divided like a ring-shape and formed from the outside bottom surface and the side bottom surface to the side bottom outer circumference of the rice-cooking pot 1, and at the center of the outside bottom surface, a thermal-detecting portion 5 consisting of a circular non-heating layer is installed. The bottom of the rice-cooking pot 1 is made thicker, round R is given to the corner of the bottom surface and the side face, the thickness of the side face becomes thinner in the upward direction, and a rib 4 is attached to the outer circumference of the bottom. This equals the thermal distribution at the bottom of the rice- cooking pot 1, resulting in cooking a delicious rice as well as improves durability to stabilize performance.

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 induction heating rice cooker.

[0002]

2. Description of the Related Art An electromagnetic induction heating rice cooker cooks rice by heating a rice cooking container installed above the electromagnetic induction heating coil by Joule heat by eddy current. Generally, as this type of rice cooking container, a magnetic container made of iron, SUS430-based stainless steel, or the like is widely used, but it is heavy and has a problem in handleability when used as a commercial 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. Conventionally, as a method of attaching a magnetic material to this aluminum rice cooking container by a thermal spraying method, an inclined groove is provided in advance on the outer bottom of the aluminum container so that iron is thermally sprayed so as not to be peeled off. No.), or a magnetic material such as iron having a thickness of 0.33 to 0.80 mm is formed on the entire bottom surface of an aluminum container by thermal spraying. There has been proposed a device having a thickness of 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, in the case where a magnetic material and an aluminum layer are formed on the entire bottom surface of the aluminum container, the magnetic field at the center of the aluminum container becomes stronger than the surrounding area, so the temperature at the center of the bottom of the container rises and the temperature distribution does not become uniform, Further, it is difficult to control the aluminum layer, and when the thickness is thin, abnormal heat is generated, and when the thickness is thick, there is a problem that heat is not generated.

[0004]

Therefore, in the present invention, the manufacturing 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 rice cooking container is provided.

As a concrete means thereof, the present invention molds a rice cooking container with aluminum or an aluminum alloy, and provides a heating layer divided in a ring shape from the outer bottom surface of the rice cooking container and the outer bottom surface to the outer periphery of the lower side surface. A temperature detecting part consisting of a circular non-heating layer is provided in the central part of the bottom part, the bottom part of the rice cooking container is made thicker, the side parts are made thinner at the upper part, and further ribs are provided on the outer periphery of the outer bottom surface. Is.

[0006]

According to the above construction, the outer bottom surface of the aluminum rice cooker used in the electromagnetic induction heating rice cooker and the heat generating layer divided into a ring shape from the outer bottom surface to the outer periphery of the lower side surface are provided, and the thickness of the bottom surface is increased. Since the thickness of the portion is thinner toward the upper portion, the temperature of only the central portion of the rice cooking container does not rise, and rice can be cooked with a uniform temperature distribution on the entire bottom surface. Further, since the heat generating layer is protected by the ribs, 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 8 denotes an electromagnetic induction heating coil, which is installed on the lower surface of the rice cooking container 1 and has a sensor 6 attached to the center thereof. Reference numeral 12 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.
The upper part is made lighter toward the upper part to make it lighter, and the rounded corners R are added to the corners of the bottom and side parts to increase the heating area and the effective heating area heated by the electromagnetic induction heating coil 8. Is getting bigger. Also this container 1
As shown in FIG. 3, iron, 13 from the outer bottom surface and the outer bottom surface to the rising portion (height of about 50 mm) of the side surface lower periphery
The heat generating layers 2a and 2b made of a ferrite material such as Cr and 18Cr stainless steel are provided in a ring shape with a distance of 40 mm to 50 mm. This will be described in detail with reference to FIG. 4. When the heating layer is provided on the entire bottom surface of the rice cooking container 1, the magnetic field L _{1 at} the central part of the rice cooking container ₁ becomes strong and the temperature of that part rises, resulting in an uneven temperature distribution. Become. Therefore, as in the present invention, the heating layers 2a and 2b are divided and provided separately to make the temperature distribution of the rice cooking container 1 uniform. The heating layer 2a,
The reason for separating 2b from 40 mm to 50 mm is to reduce the influence of the magnetic field and improve the efficiency of the magnetic field L ₂ . Further, in order to easily generate an eddy current required for induction heating, the heat generating layer 2 needs to be continuously connected without including an oxide film in the metal powder, and therefore, thermal spraying is performed in an inert gas atmosphere. To mold. Numeral 3 is an anticorrosion layer, which is made of polyisol-based heat-resistant resin such as polysulfone and heat-generating layers 2a, 2
The surface of b is coated.

Reference numeral 4 denotes a rib, which is provided on the outer periphery of the outer bottom surface of the rice cooking container 1 so as to protect it against a difference in thermal expansion and to prevent the heat generating layer 2 from coming into contact with other parts and peeling even if the container is roughly handled. are doing. Reference numeral 5 denotes a temperature detection unit, which is provided in the central portion of the bottom surface of the rice cooking container 1 and does not have a heat generating layer in order to accurately detect the temperature, and the sensor 6 is brought into close contact with this surface. Reference numeral 7 is a coil support plate to which the electromagnetic induction heating coil 8 is attached.

The electromagnetic induction heating coil 8 has an outer diameter larger than the outer diameter of the bottom surface of the rice cooking container 1 by about H = 10 mm, and the side surface of the rice cooking container 1 is also heated by a magnetic field.

In the above embodiment, the door 12 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 12 is closed to operate the operation panel 11. To do. As a result, an eddy current is generated between the electromagnetic induction heating coil 8 and the heat generating layers 2a and 2b of the rice cooking container 1 to heat the rice cooking container 1 with Joule heat to cook rice.

During this rice cooking, since the heating layers 2a and 2b of the rice cooking container 1 are divided and provided in a ring shape,
The temperature of the central part does not rise and the whole is heated uniformly. The rice cooking container 1 is provided with heating layers 2a and 2b from the outer bottom surface and the outer periphery of the lower side surface to the outer circumference 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 are rounded.
Since the above is provided, the effective area heated by the electromagnetic induction heating coil 8 is increased and rice can be cooked with a uniform temperature distribution.

Further, the ribs 4 provided on the rice cooking container 1 prevent peeling due to thermal expansion of the heat generating layer 2b, so that stable rice cooking can be obtained, and when the rice cooking container 1 is taken out to the front after completion of rice cooking or carried. However, the ribs 3 prevent the exothermic layer 2 from coming into contact with other portions, so that peeling can be prevented.

[0014]

According to the present invention, an easy-to-handle aluminum rice cooking container is used, and a ring-shaped heat generating layer made of a magnetic substance such as iron powder is formed on the outer bottom surface of the aluminum rice cooking container and from the outer bottom surface to the lower outer periphery of the side surface. Since it is divided into two parts, the entire container is heated uniformly, and the temperature distribution becomes uniform, so that delicious rice can be cooked. Further, since the ribs are provided on the bottom surface of the rice cooking container to protect the heat generating layer, it can withstand thermal expansion and does not peel off, so that stable performance is maintained. 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 thicker and the side part is thinner toward the top, the effective heating area can be expanded, and as a result, the temperature distribution on the bottom of the container becomes uniform, and delicious rice can be cooked. It is possible to provide a lightweight cooked rice cooking container.

[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.

FIG. 3 is a cross-sectional view of the rice cooking container of the present invention.

FIG. 4 is a characteristic diagram of the present invention and a conventional magnetic field.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum container 2a, 2b Heating layer 4 Rib 5 Temperature detection part 8 Electromagnetic induction heating coil

Claims (1)

[Claims] 1. An electromagnetic induction heating rice cooker which heats a rice cooking container (1) provided on an upper portion thereof corresponding to an electromagnetic induction heating coil (8) by Joule heat by eddy current, wherein the rice cooking container (1) is made of aluminum. Alternatively, the heat-generating layers (2a), (2
b) is divided into a ring shape, a temperature detecting portion (5) composed of a circular non-heating layer is provided in the central portion of the outer bottom portion, and the bottom portion of the rice cooking container (1) has a thick wall and a side surface portion. Is a rice cooker for an electromagnetic induction heating rice cooker, characterized in that the wall thickness is made thinner toward the top and ribs (4) are provided on the outer periphery of the outer bottom surface.