JPH04231919A - Rice cooker - Google Patents

Abstract

PURPOSE:To uniformly execute the rice cooking by providing a rice cooking heater in which plural pieces of heater elements are provided, on a bottom part and a side peripheral edge of an inner pot, and controlling electric energy of the heater elements in accordance with a rice cooking process to control a convection of rice at the time of boiling. CONSTITUTION:In a rice cooker 1, a heat insulating material 4 is interposed between an inner wall 2 and an outer wall 3, and a rice cooking heater 5 is provided on the inside surface of the inner wall 3 of the rice cooker main body 1. An inner pot 6 is constituted of a metal whose heat conduction is satisfactory, is bottomed and cylindrical, and contained in the rice cooker main body 1, in a state that some interval is provided between the pot and the rice cooking heater 5. A controller 9 is provided on a cover 7 so as to control the rice cooking heater 5. According to this embodiment, the inner pot 6 receives heating from the bottom part and the side peripheral edge part, and as for rice in the inside, since not only a convection extending from the center part to the outside periphery but also a convection by heating from the outside peripheral part are generated, a uniform rice cooking action can be realized, and also, in accordance with a rice cooking process, electric energy can be controlled by the controller 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rice cookers used on a daily basis in households, and particularly to heaters for rice cooking.

0002

BACKGROUND OF THE INVENTION Conventional heaters for rice cooking include the following. (1) A cast-in aluminum heater, in which a sheathed heater is cast into aluminum, is often used, and the inner pot and heater are in contact at the bottom, and heat is transferred to the water and rice by heat conduction to cook rice. (2) A method of cooking rice by blowing hot air. (3) A method that uses radiant heat to cook rice by winding a sheathed heater in a ring shape.

0003

[Problems to be Solved by the Invention] However, when using the cast aluminum heater in (1) of the above-mentioned conventional methods, heat is transferred from the bottom to the inner pot by heat conduction. There is not optimal heat transfer between the rice and water inside. In particular, when the water inside is boiling, the convection stirring of the rice rises from the center and falls to the outer periphery, resulting in uneven stirring and uneven rice production. was there. In addition, the method (2) of blowing hot air had problems such as a large temperature rise in the main unit unless proper insulation was provided. Furthermore, the method (3) of cooking rice using a ring-shaped sheathed heater had problems such as the temperature distribution tending to be uneven.

[0004] The first object of the present invention is to solve the above-mentioned problems, and by controlling the amount of electric power of a plurality of heater elements, the convection of rice, especially during boiling, can be controlled and rice can be cooked uniformly. The second purpose is to make heating easier in addition to the first purpose by limiting the materials that make up the heater, and the third purpose is to make heating easier on the surface of the heater and the outer surface of the inner pot. By forming far-infrared radiation and its absorption coating,
In addition to the primary purpose, the objective is to improve thermal efficiency.

[0005]

[Means for Solving the Problems] In order to achieve the first object of the present invention, a rice cooking heater having a plurality of heater elements is provided at the bottom and side periphery of the inner pot, and the electric power of the heater elements is A rice cooker equipped with a control device that controls the rice cooking process according to the rice cooking process, and in order to achieve the second purpose, at least one pair of heat-resistant electrical insulating materials made of synthetic phlogopite and an inorganic binder is used as a heater for rice cooking. This rice cooker uses an integrated heater with multiple heater elements positioned between them.In order to achieve the third purpose, the rice cooker is equipped with a far-infrared radiation layer on the surface and an inner pot. This rice cooker has a far-infrared absorbing coating on its outer surface.

[0006]

[Operation] In the first invention, a heater having a plurality of heater elements is provided at the bottom and side periphery of the inner pot, and a control device is provided to control the amount of electric power of the heater elements according to the rice cooking process. , by controlling the amount of electric power of the heater element at the bottom of the inner pot and the heater element at the side periphery, the convection of the rice rising from the center and falling to the outer periphery and the convection due to heating from the outer periphery are used. As a result, the entire rice is stirred evenly. In the second invention, in addition to the effect of uniformly stirring the entire rice, the configuration of the heater includes a plurality of heater elements between at least a pair of heat-resistant electrical insulators, so that the bottom of the inner pot and Placing it on the side periphery makes it easier to heat. Furthermore, in addition to the effects of the first and second inventions, the third invention has an effect of increasing thermal efficiency by using heating with far infrared rays.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention shown in the drawings will be described below. In FIG. 1, 1 is a rice cooker main body, and a heat insulating material 4 is interposed between an inner wall 2 and an outer wall 3. 5 is a heater for cooking rice, which is installed on the inner surface of the inner wall 2 of the rice cooker main body 1. Reference numeral 6 denotes an inner pot, which is made of metal with good thermal conductivity, has a cylindrical shape with a bottom, and is housed in the rice cooker main body 1 with a slight distance between it and the heater 5 for cooking rice. It has become. A lid 7 covers the upper opening of the rice cooker main body 1. A metal inner lid 8 covers the upper opening of the inner pot 7 and is detachably connected to the lid 7. Reference numeral 9 denotes a control device, which is installed on the lid 7 to control the heater 5 for cooking rice. 10
is the support part of the inner pot. According to this embodiment, the inner pot 6 is heated from the bottom and the side periphery, and the rice inside is heated not only from the center to the outer periphery, but also from the outer periphery, which causes convection, thereby achieving a uniform rice cooking effect. Furthermore, the amount of electricity can be controlled by the control device according to the rice cooking process.

FIG. 2 is an enlarged cross-sectional view of the heater 5 for cooking rice, in which a plurality of heater elements 12 are provided between at least a pair of heat-resistant electrical insulating materials 11 on the inner surface of the inner wall 2, and far infrared rays are provided on the inner surface. A radiation layer 13 was provided. Code 1 in Figure 1
4 is a far-infrared absorbing coating provided on the outer surface of the inner pot 6. By configuring the heater 5 as described above, it is possible to variously change the heating conditions by the control device 9 to achieve the most appropriate condition for rice cooking, and it is also easy to install it inside the rice cooker. It became. Furthermore, by providing a far-infrared radiation layer 13 on the innermost surface of the heater 5 and a far-infrared absorption coating 14 on the outer surface of the inner pot 6, heating by the heater is made more efficient and rice is cooked evenly. There is.

[0009]

[Effects of the Invention] As described above, in the first invention, the heater for rice cooking is composed of a plurality of heater elements, and by controlling the amount of power of the heater elements, uniform rice cooking is possible. In the second invention, by disposing the heater between at least a pair of heat-resistant electrical insulating materials, installation is easy and heating can be performed appropriately. Furthermore, in the third invention, heating efficiency is improved by providing a far-infrared radiation layer and a far-infrared absorption coating on the inner surface of the heater and the outer surface of the inner pot.

[Brief explanation of the drawing]

[Fig. 1] Cross-sectional view of a rice cooker showing one embodiment of the present invention

[
Figure 2: Enlarged cross-sectional view of the main parts of a heater for rice cooking

[Explanation of symbols]

1 Rice cooker 5 Heater 6 Inner pot 9 Control device 11 Heat-resistant electrical insulation material 12 Heater element 13 Far-infrared radiation layer 14 Far-infrared absorption coating

Claims (3)

[Claims] 1. A rice cooking heater having a plurality of heater elements arranged thereon is provided at the bottom and side periphery of the inner pot, and a control device is provided for controlling the amount of electric power of the heater element according to the rice cooking process. A rice cooker. [Claim 2] A heater for cooking rice that uses a heater in which a plurality of heater elements are positioned between at least one pair of heat-resistant electrical insulating materials made of synthetic phlogopite and an inorganic binder. The rice cooker described in 1. 3. The rice cooker according to claim 1, further comprising a far-infrared radiation layer on the surface of the rice-cooking heater, and a far-infrared absorbing coating on the outer surface of the inner pot.