JPH11309067A - Rice cooker and warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of an induction heating coil by lowering the temperature rise of the induction heating coil for performing electromagnetic induction heating and lowering a heat quantity dissipated from the induction heating coil in a rice cooker and warmer of an electromagnetic induction heating type. SOLUTION: A main body is constituted of a body 1 forming an outer shell and an inner container 2 forming an inner side, an inner pot 3 is freely attachably and detachably housed in the inner container 2 and the induction heating coil 4 for electromagnetically induction heating the inner pot 3 is provided on the outer side of the inner container 2. Then, the inner container 2 is constituted of a resin material in which a hollow part 8 is formed at least at a part abutted to the induction heating coil 4 and the hollow part 8 and the outside are communicated by a small hole 9 provided on the outer side face side of the inner container 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jar rice cooker of the electromagnetic induction heating type, and to reduce the amount of heat radiated from the induction heating coil by lowering the temperature rise of the induction heating coil, thereby reducing power consumption. It is intended for.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional jar rice cooker is provided with a heat insulating material or a heat shield plate in a space between a body and an inner container to reduce heat dissipation to the outside air through the body. The power consumption during cooking and keeping warm was reduced. This was basically the same technology as the resistance-wire heater-heated jar rice cooker before the electromagnetic induction heated jar rice cooker became available on the market.

[0003]

In such a conventional jar rice cooker, the heat in the inner pot is dissipated to the inner container, and the heat is interrupted by the heat insulating material or the heat shield plate while the heat is dissipated from the inner container to the body. Is done. Therefore, the inner container reaches a temperature close to that of the inner pan, and heat is also conducted to the induction heating coil attached to the inner container. Since the induction heating coil is formed by winding a copper wire into a coil shape and has a large heat capacity, the amount of heat absorbed by the induction heating coil is large.

[0004] In addition, when continuous heating of large power is performed by the induction heating coil during rice cooking, the induction heating coil becomes high in temperature due to self-heating and heat transfer from the inner container. Therefore, the induction heating coil is generally in a state of being easily radiated and cooled, and when the heat of the inner pan is transmitted to the induction heating coil via the inner container, the heat is radiated from the induction heating coil. As a result, in order to maintain the temperature of the inner pot, it is necessary to supply heat with an induction heating coil,
There is a problem that the power consumption becomes high.

[0005]

In order to solve the above-mentioned conventional problems, in the present invention, the main body is constituted by an outer body and an inner container, and an inner pan is detachably stored in the inner container. A jar rice cooker provided with an induction heating coil for electromagnetically heating an inner pot outside the inner container, wherein the inner container is made of a resin material, and at least a portion in contact with the induction heating coil is formed in a hollow shape. It is.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, since a hollow portion is provided in the inner container at a portion in contact with the induction heating coil, heat transmitted from the inner pan to the inner container is insulated by the hollow layer inside the inner container. , It is difficult to conduct heat to the induction heating coil. As a result, heat dissipation can be minimized, the amount of heating required to maintain the temperature of the inner pan is small, and the amount of power consumption can be minimized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a jar rice cooker according to the present invention.

In the figure, 1 is a body, 2 is an inner container,
3 is an inner pot, 4 is an induction heating coil, 5 is a power supply unit, 6 is a cooling hole, 7 is a side heating unit, 8 is a hollow part, 9 is a small hole, 10 is a temperature sensor, and 11 is a control unit.

The structure is such that the main body forms an outer shell.
An inner pot 3 for storing cooked rice is detachably stored in the inner container 2. An induction heating coil 4 is provided on the outer surface of the inner container 2, and a power supply unit 5 for supplying power to the induction heating coil 4 is provided in the main body. The body 1 is provided with a cooling hole 6 for cooling the induction heating coil 4 and the power supply unit 5. A side heating section 7 made of a resistance wire heater is provided over the entire outer periphery of the side surface of the inner container 2, and is configured to closely contact the inner container 2 and transmit the heat to the inner container 2. . Inner container 2
A hollow portion 8 is provided from a lower side of the side surface to a bottom surface with which the induction heating coil 4 contacts. Inner vessel 2 and hollow section 8
Is made of integrally molded resin, and is molded by a technique of filling a resin into a mold and injecting a gas at the time of molding to form a thick interior into a hollow.

[0010] At least one small hole 9 is provided on the outer surface of the inner container 2 (on the side of the induction heating coil contacting side), so that the hollow portion 8 communicates with the inside and outside air of the main body. .

In the center of the bottom of the inner container 2, a temperature sensor 10 is provided.
Is provided, and the temperature of the inner pot 3 is input to the control unit 11 provided in the main body by coming into contact with the inner pot 3. The power supply unit 5 supplies power to the induction heating coil 4 and the side surface heating unit 7 based on a signal from the control unit 11 to heat it.

Next, the operation and operation will be described. When the user puts an appropriate amount of rice and water into the inner pot 3 and operates a rice cooker switch (not shown), power is supplied from the power supply unit 5 to the induction heating coil 4 by the operation of the control unit 11, and the inside is heated by the induction heating. Pot 3 generates heat, and rice cooking starts. At this time, the high-frequency magnetic field generated by the induction heating coil 4 passes through the resin-made meat portion of the inner container 2 and the air layer of the hollow portion 8 and acts only on the inner pot 3 which is a magnetic metal material and is converted into heat. You.

During rice cooking, the induction heating of the induction heating coil 4 via the power supply unit 5 is controlled by a command from the control unit 11 according to the temperature information of the temperature sensor 10, but high heating power for rice cooking is required. Due to the self-heating of the induction heating coil 4 and the conduction heat from the inner pot 3, the inner container 2 becomes high in temperature.

At this time, the air in the hollow portion 8 is also heated,
Although it expands and the pressure increases, it is released to the air in the main body from the small holes 9 and the pressure in the hollow portion 8 does not abnormally increase.

During the rice cooking, the power supply unit 5 also has a high temperature, but is cooled together with the induction heating coil 4 by the outside air supplied from the cooling holes 6.

When the inside of the inner pot 3 boils and the rice absorbs all the water and becomes rice, the rice cooking is completed and the operation automatically shifts to heat retention. When the rice is cooked, heating is not performed because the temperature in the inner pot 3 is high at the beginning of the rice cooking. However, when the temperature of the cooked rice drops to the warming temperature (approximately 74 ° C.), the temperature is detected by the temperature sensor 10 and the control unit 11 By the operation, the power supply to the side surface heating unit 7 via the power supply unit 5 is started. At the same time, the induction heating coil 4 is also intermittently heated with weak electric power,
Is heated slightly. When the temperature of the temperature sensor 10 rises due to the heating, the heating is stopped, and thereafter, the temperature is kept at the heat retaining temperature by repeating this process.

In this state, the heat generated by the side heating unit 7 is transmitted to the inner container 2. Since the hollow portion 8 is not provided in this portion, the heat transmitted from the contact surface of the side container heating portion 7 of the inner container 2 is transmitted through the meat portion of the inner container 2 and the inner wall of the inner container 2 side surface becomes high temperature. The opposing inner pot 3 side is heated. On the other hand, the induction heating coil 4 portion is different from continuous energization during rice cooking, and does not become hot due to self-heating due to intermittent heating of weak electric power at the time of warming.
It is equal to the ambient temperature inside the main body.

Since the bottom and lower side of the inner pan 3 are at a temperature higher than the temperature of the cooked rice, heat is transmitted to the surface of the inner pot 3 facing the inner pot 3, but a hollow portion 8 is provided in the inner pot 2. Therefore, the thermal conductivity is lower than that of the inner container 2 in which the heat is conducted. Therefore, the heat transmitted from the inner pot side surface of the inner container 2 to the induction heating coil side surface of the inner container 2 via the hollow portion 8 is very small, and the heat transmitted to the induction heating coil 4 is also very small. That is, the heat of the inner pan 3 is less likely to be transmitted to the induction heating coil 4 which is easily cooled, and the inner pan 3 is less cooled, and accordingly, the amount of heat to be heated by the side heating unit 7 and the induction heating coil 4 in order to maintain the temperature is reduced. I need less. For this reason, power consumption can be reduced and energy can be saved. In addition, if the amount of heating is large, the temperature in the rice in the inner pot 3 tends to be uneven, and particularly, the rice near the heating source is constantly exposed to high temperatures, and is quickly dried, deteriorated, and smelled. As a result, the rice can be kept in a good condition.

[0019]

As described above, in the present invention, since the hollow portion is provided in the inner container at the portion facing the induction heating coil, the heat transmitted from the inner pan to the inner container is insulated by the hollow layer inside the inner container. Therefore, it is difficult to conduct heat to the induction heating coil. As a result, heat dissipation can be minimized, the amount of heating required to maintain the temperature of the inner pan is small, and the amount of power consumption can be minimized.

In a rice cooker that is not of the electromagnetic induction heating type, the inner pot is heated by the heat conduction with the resistance wire heater, so that the heat insulation in the hollow part of the present invention is impossible. This is unique to the characteristics of induction-cooked rice cookers that generate heat by acting on a pot.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a jar rice cooker according to the present invention.

FIG. 2 is a side sectional view of a conventional jar rice cooker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Inner container 3 Inner pan 4 Induction heating coil 7 Side heating part 8 Hollow part 9 Small hole

Claims (1)

[Claims] 1. A main body comprising a body (1) forming an outer shell and an inner container (2) forming an inner side. An inner pot (3) is detachably stored in the inner container (2), In a jar rice cooker provided with an induction heating coil (4) for electromagnetically heating the inner pot (3) outside the inner pot (2), the inner container (2) is made of a resin material and at least the induction heating coil (4). A jar rice cooker characterized in that the part in contact with the jar is hollow.