JP2575083Y2 - rice cooker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker for cooking rice by an electromagnetic induction heating method.

[0002]

2. Description of the Related Art In order to cook delicious rice, a strong heat power is required.
In some cases, the inner pot is heated by electromagnetic induction.

For example, in Japanese Patent Application Laid-Open No. 1-276584, a protective frame is divided into a nonmetallic bottom portion and a metal side portion (radiation ring), and a heating element (resistance heater) is disposed on the side portion. At the time of cooking rice, a large electric power is supplied by using an induction heating coil provided at the bottom as a main heating source, and at the time of keeping the temperature, a uniform heating of the side is performed by using a heating element of the side as a main heat source.

[0004]

In the rice cooker of the electromagnetic induction heating system, when rice is cooked using the induction heating coil as a main heat source, the temperature of the bottom portion and the lower portion of the side surface of the inner pot is high. If this heat is transmitted to the bottom and the lower side of the protective frame by radiation, it will adversely affect the heat resistant temperature of the protective frame made of a non-magnetic material, and may exceed the dielectric heat resistant temperature of the induction heating coil attached to the protective frame bottom. There is a problem that sufficient power cannot be supplied for protection. The distance between the bottom of the protection frame and the bottom of the inner pot is limited due to the convenience of induction heating. To avoid this, the distance between the lower side of the protection frame and the lower side of the inner pot needs to be as large as possible. In addition, induction heating does not reach the upper part of the inner pot and the temperature is low even during rice cooking, and it is necessary to heat the upper part of the inner pot side to cook rice uniformly well,
In the case of heating with the heating element on the side of the protective frame as in the conventional example, the shorter the distance between the upper side of the inner pot and the heating element, the more advantageous in terms of heat conduction efficiency.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a protection frame for accommodating an inner pot in a main body. In addition to the induction heating coil, a heat radiating ring is provided above the protective frame, and a heat generating element is provided on the heat radiating ring. The difference between the inner diameter of the heat radiating ring and the outer diameter of the inner pot is the inner diameter of the protective frame bottom and the outer The heat radiating ring was arranged so as to be smaller than the difference from the diameter.

[0006]

With the above structure, the heat dissipating ring facing the upper side of the inner pot is close to the inner pot and the upper side of the inner pot can be efficiently heated, and the lower side of the protective frame facing the lower side of the inner pot is far from the inner pot. Since the heat shielding effect on the lower side can be increased,
Even if the induction heating coil is set to high power, delicious rice with high power can be produced without causing abnormalities such as thermal deformation of the protective frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a main body, which has a protective frame 3 for accommodating the inner pot 2 in a detachable manner. The protection frame 3 includes a heat radiating ring 4 having a bottom portion formed of a nonmagnetic material, a side portion formed of a metal material, and a heating element 6 provided thereon. The difference between the inner diameter of the heat radiating ring 4 and the outer diameter of the upper side of the inner pot 2 is smaller than the difference between the inner diameter of the side of the protective frame 3 and the outer diameter of the lower side of the inner pot 2. Reference numeral 5 denotes an induction heating coil. , Are provided outside the bottom of the protection frame 3. Reference numeral 7 denotes a lid, which is attached to the main body 1 so as to be freely opened and closed. Numeral 10 denotes a heat insulating material which is filled above the space between the main body 1 and the protective frame 3 to enhance the heat retaining performance and also to shut off the heat of the heating element 6 to prevent the temperature of the main body 1 from rising.

The operation of this embodiment having the above configuration will be described.

[0010] The cooked rice and an appropriate amount of water are put into the inner pot 2, stored in the main body 1, the lid 7 is closed, and a rice cooker switch (not shown) is pressed to start cooking rice. That is, the induction heating coil 5 is energized, and the bottom and the lower side of the inner pot 2 are heated by electromagnetic induction, and the heating element 6 is also energized. This heat is diffused to the heat radiation ring 4 and transmitted to the inner pot 2 by radiation to heat Is done.
At this time, the bottom and the side of the inner pot 2 become hot, and this heat not only heats the rice and water inside the inner pot 2 but also transmits to the bottom and the side of the protective frame 3 by radiation. Since the distance between the side portions of the protection frame 3 is large, heat transmitted to the protection frame 3 by radiation can be reduced, and even if the power supplied to the induction heating coil 5 is set large, an abnormality such as thermal deformation of the protection frame 3 is caused. Nothing.

Further, the upper portion of the inner pot 2 is heated by the heat radiating ring 4 at a relatively shorter distance than the lower portion of the inner pot, so that radiant heat can be transmitted efficiently, and the bottom of the inner pot 2 can be heated. In addition to the above, the upper part can be heated efficiently, so that delicious rice can be provided.

The protection frame 3 made of a non-magnetic material may be provided up to the upper portion as shown in FIG. 2, or may be divided into an upper portion 8 and a lower portion 9 of the protection frame as shown in FIG. In any case, the heat of the heating element 6 is blocked to prevent heat radiation to the main body 1 side, thereby preventing the temperature of the main body 1 from rising.

[0013]

According to the present invention, at least the bottom of the protection frame for accommodating the inner pot is formed of a non-magnetic material, the induction heating coil is disposed at the bottom of the protection frame, and the heat radiation ring is provided at the top of the protection frame. The heat radiating ring is provided with a heating element, and the heat radiating ring is arranged so that the difference between the inner diameter of the heat radiating ring and the outer diameter of the inner pot is smaller than the difference between the inner diameter of the bottom of the protective frame and the outer diameter of the inner pot. The heat radiation ring facing the upper part of the inner pot is close to the inner pot and can efficiently heat the upper part of the inner pot side, and the lower part of the protection frame facing the lower part of the inner pot is far from the inner pot and has a large heat shielding effect. An electric power supplied to the induction heating coil can be set large without causing an abnormality such as deformation of the frame, and a rice cooker that can cook delicious rice can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a rice cooker showing one embodiment of the present invention.

FIG. 2 is a schematic sectional view of a rice cooker showing another embodiment of the protection frame of the present invention.

FIG. 3 is a schematic sectional view of a rice cooker showing another embodiment.

FIG. 4 is a schematic sectional view of a rice cooker showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inner pot 3 Protective frame 4 Heat radiating ring 5 Induction heating coil 6 Heating element

Claims (1)

(57) [Scope of request for utility model registration] A body (1) has a protective frame (3) for accommodating an inner pot (2), and the protective frame (3) has at least a bottom portion made of a non-magnetic material, and is provided at a bottom portion of the protective frame (3). In addition to disposing the induction heating coil (5), the heat radiating ring (4) is disposed above the protective frame (3), and the heating element (6) is disposed on the heat radiating ring (4).
And heat insulation between the heating element (6) and the side of the main body (1)
The material (10) or the protective frame (3) is positioned , and the difference between the inner diameter of the heat radiating ring (4) and the outer diameter of the inner pot (2) is determined by the inner diameter of the bottom of the protective frame (3) and the inner pot (2). A rice cooker characterized in that a heat radiating ring (4) is provided so as to be smaller than a difference from an outer diameter of the rice cooker.