JPH075772Y2 - Induction heating rice cooker - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating rice cooker using electromagnetic induction.

[0002]

2. Description of the Related Art An induction heating cooker utilizing electromagnetic induction is known to have high heating efficiency, and has a flat cooking table type in which a cooking container which heats up due to the electromagnetic induction action of an induction heating coil is placed and used. Is widely provided and used.

For example, Japanese Utility Model Publication No. 61-31507 discloses an electromagnetic induction cooker of this type.

In this device, a top plate that covers the induction heating coil is formed from a magnetically permeable material such as ceramic that allows the magnetic flux of the induction heating coil to pass therethrough to form a cooking surface. Therefore, the cooking container that generates heat due to the electromagnetic induction effect of the induction heating coil is placed on the top plate made of the magnetically permeable material for cooking.

[0005]

If the above-mentioned conventional example is applied to a rice cooker as it is, the following problems occur.

Since the bottom portion of the rice cooker containing a large amount of rice and water contacts the magnetic field line transmitting material such as ceramics, which is weak against impact, the magnetic field line transmitting material is easily cracked by the impact during mounting.

Since the side peripheral surface of the rice cooker is exposed to the outside,
The heat of the rice cooker escapes and the heat efficiency is poor, and the bottom of the rice cooker is intensively heated to become local heating, so that the rice cannot be heated uniformly and sufficiently from the entire circumference, and the rice cannot be cooked fluffy.

Since the rice cooker that generates heat is located in the outer case together with the induction heating coil, and the structure is such that heat easily accumulates in the outer case, the electronic component equipment part for controlling the energization of the induction heating coil is provided in the outer case. High heat is likely to be applied when using the space around the bottom of the device, and the characteristics of the electronic component having poor heat resistance in the electronic component equipment part are likely to be impaired.

In view of the above problems, the present invention can keep the distance between the rice cooker and the induction heating coil constant without contacting the bottom of the rice cooker with the magnetic field line permeable material.
While not easily releasing the heat of the rice cooker to the outside, while improving the heating efficiency,
An induction heating rice cooker that can suppress the heat effect on the electronic component equipment part that controls the conduction of the induction heating coil, etc., and can wrap the entire rice cooker and heat it to make the rice fluffy The challenge is to provide.

[0010]

In order to achieve the above object, the present invention provides an induction heating coil in an outer case, and a rice cooker that generates heat by electromagnetic induction of the induction heating coil.
An inner container, which is open at the top and wraps the rice cooker from below, and which is located between the induction heating coil and the rice cooker and through which the magnetic lines of force of the induction heating coil can pass, is arranged on the upper opening edge of this inner container. The rice cooker is mounted so that the upper edge of the rice cooker is in close contact with the rice cooker, and the rice cooker is supported by the inner container, and electronic component equipment is provided under the induction heating coil and isolated from the induction heating coil side by a heat shield cover. In addition to providing the parts, a fan for cooling the electronic component equipment part is provided.

[0011]

According to the above construction of the present invention, the upper end peripheral portion of the rice cooker is hung on the upper opening edge of the inner container to support the inner container, so that the bottom of the rice cooker is floated from the bottom of the inner container. Since the inner container is made of a magnetic field line transmitting material through which magnetic field lines from the induction heating coil are transmitted, the magnetic field lines from the induction heating coil can be effectively applied to the rice cooker, and the inner container wraps the rice cooker from below. This prevents the heat of the rice cooker, which is generated by the magnetic lines of force from the induction heating coil that works effectively, from radiating to the outside, and at the same time allows the heat to be well contained within the inner container range from the entire circumference of the rice cooker. It is possible to heat the cooked rice, and the electronic component equipment part can be provided under the induction heating coil and provided in the space around the bottom of the outer case,
Since it is isolated from the induction heating coil side by the heat shield cover, the heat effect from the induction heating coil side is less likely to occur, and it is separated from the induction heating coil side by the heat shield cover by the fan located on the same side. As a result, air is blown and cooled without drawing in the atmosphere on the induction heating coil side, so that it is possible to suppress the temperature rise of the electronic component equipment part.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention shown in FIGS. 1 and 2 will be described. The induction heating rice cooker of the present embodiment has an outer case 3 in which the rice cooker 1 and the inner container 2 are housed, as shown in FIG. In this outer case 3, a bottom member 5 and a shoulder member 6 made of synthetic resin are fitted on the upper and lower edges of the metal cylinder 4, respectively.

An induction heating coil 8 for generating lines of magnetic force is provided on a support board 7 provided inside the exterior case 3.

A thermistor 9 for detecting the temperature of the rice cooker 1 is provided at the center of the support board 7 while being constantly urged upward by a coil spring 10.

Below the induction heating coil 8, an inverter circuit for driving the induction heating coil 8 as shown in FIG.
And an electric circuit section 11 including a control circuit for controlling this inverter circuit according to the temperature of the rice cooker 1,
Equipped with various electronic components.

The electric circuit section 1 as the electronic component equipment section
In No. 1, the relay switch is turned on when the rice cooking switch is turned on, and a high frequency current flows through the induction heating coil 8.

The thermistor 9 detects the temperature of the bottom portion 17 of the rice cooker 1, and the reed switch is turned off at the end of rice cooking.

The electric circuit section 11 is provided together with the fan 12 inside the heat shield cover box 41 on the bottom member 5, and is isolated from the induction heating coil 8 side by the fan 12 to create an atmosphere on the induction heating coil 8 side. It is designed to be blown from above and cooled without being pulled in.

The fan 12 has an electric circuit section 1 so that electronic components such as power transistors used in the inverter circuit, which have low heat resistance, do not rise above the guaranteed temperature.
1 is for cooling.

The inner container 2 is made of a magnetic field line permeable material such as ceramic or heat-resistant resin that allows magnetic field lines to pass therethrough, and has a shape in which the upper side is opened and the rice cooker 1 is wrapped from below.
The upper opening edge 13 is formed on the outward flange.

The inner container 2 is removably incorporated in the outer case 3 by supporting the upper end opening edge 13 on a step portion 14 provided on the inner peripheral side of the shoulder member 6.

In the center of the bottom plate 114 of the inner container 2,
An insertion hole 15 for inserting the thermistor 9 is provided.

The rice cooker 1 is made of a material such as iron or ferromagnetic type stainless steel that generates heat by high-frequency magnetic field lines. The upper edge 16 is formed as an outward flange, and the bottom 17 is formed as a flat plate.

Then, the upper end peripheral portion 16 of the rice cooker 1 is hung on the upper end opening edge 13 of the inner container 2 in close contact with each other, so that the rice cooker 1 is supported by the inner container 2 and held by the outer case 3. It

The lid 18 of the outer case 3 is formed by the shoulder member 6
And a hinge 19 attached between and so that they can be opened and closed. An inner lid 20 that closes the rice cooker 1 is disposed on the lower surface side of the lid body 18.

According to the induction heating rice cooker configured as described above, the upper end peripheral portion 16 of the rice cooker 1 can be supported in close contact with the upper end opening edge 13 of the inner container 2 arranged in the outer case 3. it can.

Since the upper end opening edge 13 is backed up by the shoulder member 6 of the outer case 3, even if a large amount of rice or water enters the rice cooker 1, the inner container 2 does not crack and the rice cooker 1 does not break. The load can be dispersed in an annular shape and can be sufficiently supported.

Further, by this, the bottom portion 17 of the rice cooker 1 can be held at a constant distance from the induction heating coil 8.

A space 21 between the rice cooker 1 and the inner container 2
Since it is a closed space, the heat of the rice cooker 1 does not easily escape to the outside, the heating efficiency is improved, and the rice cooker 1 can be heated so as to be wrapped around the entire rice cooker 1, and the rice can be boiled fully.

However, if the entire inner container 2 is made of a magnetic field ray permeable material as described above, it is necessary to set the thickness so that it can withstand a shock to the extent that it is normally handled, and the shoulder member of the outer case 3 is required. Since the load due to its own weight when the inner container 2 is supported by 6 works concentratedly on the upper opening edge 13 part, this part needs to be particularly thick and becomes heavy and bulky. Is large and heavy, which is inconvenient to use. In addition, since a large amount of expensive magnetic field ray transmitting material is used, the cost of the rice cooker is significantly higher than that of an ordinary electric rice cooker.

The second embodiment of the present invention shown in FIG. 3 has a bottom plate portion 11 of the inner container 2 in order to solve such a problem.
Only the magnetic field ray transmitting material 4 is formed, and the side peripheral portion 22 is made of an aluminum-based material.

A lower edge portion 23 of the side peripheral portion 22 is formed as an inward flange, and a peripheral edge of the bottom plate portion 114 is adhered and fixed by a heat-resistant silicone adhesive 24.

As a result, the amount of expensive ceramic used can be reduced to obtain a low-cost, lightweight, small-sized induction heating rice cooker, and the load of the rice cooker 1 can be completely eliminated from the weak bottom plate 114 made of ceramic or the like. Do not join.

Further, the aluminum-based material usually hardly generates heat, and the influence of the magnetic lines of force of the induction heating coil 8 is small.

Further, the bottom plate portion 114 of the inner container 2 is received from below by the inward flange formed by the lower edge portion 23 of the side peripheral portion 22 of the inner container 2 and enters from the installation surface of the inner container 2. When the inner container 2 is taken out from the outer case 3 and handled for cleaning or placed directly, it is possible to prevent the inner container 2 from colliding with others and being damaged.

The third embodiment of the present invention shown in FIG. 4 is for further cost reduction. The bottom plate portion 114 is made of heat resistant resin, and the lower edge portion 23 of the side peripheral portion 22 is formed as an outward flange. At the same time, a plurality of bolt screwing portions 25 are integrally formed on the peripheral edge of the bottom plate portion 114, and both are fastened and fixed by bolts 26. This makes it possible to avoid the use of expensive materials and further reduce costs while maintaining sufficient strength and heating efficiency.

FIG. 5 shows a fourth embodiment of the present invention, in which the magnetic field line transmitting material forming the bottom plate portion 114 of the inner container 2 is made of transparent ceramic glass, and infrared rays are provided in the central portion of the induction heating coil 8. The temperature sensor 27 is arranged, and the point that the outer surface of the bottom plate of the inner container 2 other than the portion 29 facing the infrared temperature sensor 27 is made opaque by printing 28 is different from the above embodiments.

As a result, the infrared temperature sensor 27 does not contact the temperature of the bottom plate portion 17 of the rice cooker 1 and the transparent portion 29 of the inner container 2.
Since the sensor 27 is not subject to the load of the rice cooker 1, it is not necessary to reinforce the sensor 27.

Further, since there is no opening in the bottom plate portion 114 of the inner container 2, water in the inner container 2 does not leak and a special waterproof device such as the induction heating coil 8 and the electric circuit portion 11 is unnecessary.

In the fifth embodiment of the present invention shown in FIG. 6, an opening 30 is provided at the center of the bottom plate 114 made of a heat resistant resin as a magnetic field line transmitting material forming the bottom plate 114 of the inner container 2. A transparent heat-resistant resin window member 31 is bonded and fixed to the bottom plate portion 114 with a silicone adhesive 24 in the opening 30 to form a transparent portion 29.

A sixth embodiment of the present invention shown in FIG. 7 is a side peripheral portion 22 of the inner container 2 formed of ceramic or heat resistant resin.
An opening 29 as a transparent portion is provided in the interior of the rice cooker 1, and the temperature of the portion near the bottom 17 of the rice cooker 1 is detected through the opening 29.

Further, the same function and effect can be obtained by making the entire inner container 2 transparent instead of the transparent portion or the opening.

The present invention can be constructed in various modes other than the above embodiment. For example, outer case, inner container,
The shape and material of the exerted and transparent parts are not always limited to those shown in the examples, and can be freely designed as required.

[0044]

According to the present invention, the upper edge of the rice cooker is
Since the rice cooker is hung on the upper opening edge of the inner container to support the inner container, the bottom of the rice cooker is made to float from the bottom of the inner container. Things that work and damage it are avoided.

The inner container is made of a magnetic field line transmitting material for transmitting the magnetic field lines from the induction heating coil, and the magnetic field lines from the induction heating coil are effectively applied to the rice cooker, so that the heating efficiency is good, and the inner container is the rice cooker. By enclosing the rice cooker from below, the heat of the rice cooker, which is generated by the magnetic field lines from the induction heating coil that works effectively, is prevented from radiating to the outside, and at the same time the heat is well contained in the inner container range. Since the cooked rice is efficiently heated from around the whole, it is possible to obtain plump and delicious rice with good heat efficiency.

Further, the electronic component mounting portion is located below the induction heating coil and is provided in the space around the bottom portion of the outer case, so that the space can be effectively used to prevent the overall size from increasing. Yes, it can be isolated from the induction heating coil side by a heat shield cover, and the heat effect from the induction heating coil side is less likely to occur, and it is isolated from the induction heating coil side by the fan located on the same side. In this state, the temperature of the electronic component equipment part is suppressed by being blown and cooled without pulling in the atmosphere on the induction heating coil side, and the temperature rise of the electronic component equipment part is suppressed. This can prevent the characteristics from being deteriorated by the influence of heat.

[Brief description of drawings]

1 and 2 are a sectional view and a circuit diagram showing a first embodiment,
FIG. 3 is a sectional view of an essential part showing a second embodiment of the present invention, and FIG.
Is a cross-sectional view of a main part showing a third embodiment of the present invention, FIG. 5 is a cross-sectional view showing a fourth embodiment of the present invention, and FIG. 6 is a fifth view of the present invention.
FIG. 7 is a sectional view of an essential part showing an embodiment of the present invention, and FIG. 7 is a sectional view of an essential part showing a sixth embodiment of the present invention.

[Explanation of symbols]

 1 Rice Cooker 2 Inner Container 3 Exterior Case 8 Induction Heating Coil 11 Electric Circuit Part 12 Fan 13 Top Opening Edge 114 Bottom Plate 16 Top Edge Perimeter 41 Thermal Barrier Cover Box

Claims (1)

[Scope of utility model registration request] 1. An induction heating coil in an outer case, a rice cooker that generates heat by electromagnetic induction of the induction heating coil, a rice cooker enclosing the rice cooker from below and having an upper opening, and between the induction heating coil and the rice cooker. And an inner container permeable to the magnetic lines of force of the induction heating coil is placed, and the rice container is hung on the upper opening edge of the inner container so that the upper peripheral portion of the rice container is in a close contact state. And a fan for cooling this electronic component equipment part is provided under the induction heating coil and an electronic component equipment part isolated from the induction heating coil side by a heat shield cover. Induction heating rice cooker.