JPH0568423U - Induction heating rice cooker - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain plump cooked rice with good heat efficiency, and to damage the characteristics of electronic components that are weak in heat resistance due to damage to the magnetic field line transmission material and temperature rise of electronic component equipment. To be able to prevent. [Structure] An induction heating coil 8 in an outer case 3, a rice cooker 1 that generates heat by an electromagnetic induction action of the induction heating coil 8, the rice cooker 1 is opened from above and the rice cooker 1 is wrapped from below, and the induction heating coil 8 and the rice are cooked together. The inner container 2 which is positioned between the inner container 2 and the induction heating coil 8 and through which the magnetic lines of force of the induction heating coil 8 can pass is disposed, and the upper end peripheral edge portion 16 of the rice cooker 1 is in close contact with the upper end opening edge 13 of the inner container 2. And the rice cooker 1 is supported by the inner container 2 so that the electronic component mounting portion 11 is provided below the induction heating coil 8 and isolated from the induction heating coil 8 by the heat shield cover 41. A fan 12 for cooling the electronic component mounting unit 11 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an induction heating rice cooker using electromagnetic induction.

[0002]

[Prior Art]

 Induction heating cookers that use electromagnetic induction are known to have good heating efficiency, and there are widely provided flat cooker-type cookers that use a cooking container that generates heat due to the electromagnetic induction of the induction heating coil. It is used.

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

In this device, a top plate which covers the upper part of the induction heating coil is formed of a magnetically permeable material such as ceramic that can transmit the magnetic field lines of the induction heating coil to form a cooking surface. Therefore, the cooking container which generates heat by the electromagnetic induction action of the induction heating coil is designed to be placed on the top plate made of the magnetically permeable material for cooking.

[0005]

[Problems to be solved by the device]

 By the way, if the above conventional example is applied to a rice cooker as it is, the following problems occur.

[0006] Since the bottom of the rice cooker containing a large amount of rice and water contacts the magnetic field line transmitting material such as ceramic, which is weak against impact, the magnetic field line transmitting material is easily broken 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 at the same time, the bottom of the rice cooker is intensively heated to become local heating, and the rice is evenly distributed around the entire surface It can't be cooked in full, because it can't be heated enough.

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 that controls the energization of the induction heating coil, etc. High heat is easily applied when using the space around the bottom of the case, and the characteristics of electronic components with poor heat resistance in the electronic component equipment 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 transmitting material, and It is possible to prevent heat from escaping to the outside and improve heating efficiency, while suppressing the heat effect on the electronic component equipment part that controls the energization of the induction heating coil, etc., and wrapping the entire rice cooker to heat the rice. It is an object of the present invention to provide an induction heating rice cooker capable of fully cooking rice.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has an induction heating coil in an outer case, a rice cooker that generates heat by the electromagnetic induction action of this induction heating coil, and an induction cooker that is open at the top and wraps the rice cooker from below. And an inner container located between the rice cooker and the magnetic field lines of the induction heating coil are permeable, and the upper edge of the rice cooker is in close contact with the upper opening edge of the inner container. The rice cooker is hung and supported on the inner container, and under the induction heating coil, an electronic component equipment section separated from the induction heating coil side by a heat shield cover is provided and the electronic component equipment section is cooled. The feature is that a fan is installed.

[0011]

[Action]

 According to the above configuration of the present invention, the upper edge 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 can be floated from the bottom of the inner container. Since the inner container is a magnetic field line transmitting material through which the 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 and from around the entire rice cooker. The rice can be heated, and the electronic component equipment can be installed under the induction heating coil by using the space around the bottom of the outer case. Since it is isolated by the heat shield cover, the heat effect from the induction heating coil side is less likely to occur, and the induction heating coil side is separated from the induction heating coil side by the fan located on the same side while being separated by the heat shield cover. Since the air is blown and cooled without drawing in the atmosphere, it is possible to suppress the temperature rise of the electronic component equipment part.

[0012]

【Example】

 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 around the upper and lower edges of the metal cylinder 4, respectively.

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

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

Below the induction heating coil 8, an inverter circuit for driving the induction heating coil 8 and a control circuit for controlling the inverter circuit according to the temperature of the rice cooker 1 are provided as shown in FIG. The electric circuit section 11 is provided and is equipped with various electronic parts.

In the electric circuit portion 11 as the electronic component equipment portion, when the rice cooking switch is turned on, the relay 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 lead switch is turned off at the end of rice cooking.

The electric circuit unit 11 is provided together with the fan 12 in 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 guide the induction heating coil 8. Air is blown from above and cooled without drawing in the atmosphere on the side.

The fan 12 is for cooling the electric circuit unit 11 so that electronic components having weak heat resistance such as power transistors used in the inverter circuit do not rise above the guaranteed temperature.

The inner container 2 is made of a magnetic field line permeable material such as ceramics or heat-resistant resin that allows magnetic field lines to pass therethrough, and has a shape that is open at the top and wraps the rice cooker 1 from below. Has been done.

The inner container 2 is detachably incorporated into 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.

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

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 top edge portion 16 is formed as an outward flange, and the bottom portion 17 is formed as a flat plate.

Then, the upper edge 16 of the rice cooker 1 is placed on the upper opening edge 13 of the inner container 2 in a close contact manner, 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 connected to the shoulder member 6 so as to be opened and closed by a hinge 19 attached to the shoulder member 6. An inner lid 20 that closes the rice cooker 1 is provided 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 is contained in the rice cooker 1, the inner container 2 will not be broken and the rice cooker 1 will be broken. 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.

Since the space 21 between the rice cooker 1 and the inner container 2 is a closed space, the heat of the rice cooker 1 is unlikely to escape to the outside, improving the heating efficiency and wrapping around the rice cooker 1 from the whole. It can be heated and cooked rice fluffy.

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 outer case 3 is Since the load due to its own weight when the inner container 2 is supported by the shoulder member 6 concentrates on the upper end opening edge portion 13, this portion needs to be particularly thick and becomes heavy and bulky. The rice cooker is large and heavy, which makes it inconvenient to use. In addition, a large amount of expensive magnetic field ray transmitting material is used, which makes the rice cooker much more expensive than a normal electric rice cooker.

In order to solve such a problem, the second embodiment of the present invention shown in FIG. 3 is such that only the bottom plate portion 114 of the inner container 2 is made of a magnetic field line transmitting material and the side peripheral portion 22 is made of aluminum. It is a um-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 silicone adhesive 24 having heat resistance.

As a result, it is possible to reduce the amount of expensive ceramics used and to obtain a lightweight, small-sized induction heating rice cooker at low cost, and the load of the rice cooker 1 is reduced to the weak bottom plate portion 114 made of ceramic or the like. I do not join at all.

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, since 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 of the outer case 3 and handled for cleaning or placed directly, it is possible to prevent the inner container 2 from colliding with other parts 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 transmitting material forming the bottom plate portion 114 of the inner container 2 is formed of transparent ceramic glass, and the central portion of the induction heating coil 8 is formed. An infrared temperature sensor 27 is provided in the inner container 2, and the outer surface of the bottom plate portion of the inner container 2 other than the portion 29 facing the infrared temperature sensor 27 is printed 28 so as to be opaque.

As a result, the infrared temperature sensor 27 can measure the temperature of the bottom plate portion 17 of the rice cooker 1 through the transparent portion 29 of the contents container 2 without contact, so that the load of the rice cooker 1 is applied to the sensor 27. Therefore, the sensor 27 does not need to be reinforced.

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, the opening 30 is formed in the center of the bottom plate 114 made of a heat resistant resin for the magnetic field line transmitting material forming the bottom plate 114 of the inner container 2. A transparent heat-resistant resin window member 31 is provided in the opening portion 30 and fixed to the bottom plate portion 114 with a silicone adhesive 24 to form a transparent portion 29.

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

Further, instead of the transparent portion or the opening, the same effect can be obtained even if the entire inner container 2 is made transparent.

The present invention can be configured in various modes in addition to the above-described embodiments. For example, the shape and material of the outer case, the inner container, the exhibit, the transparent portion, etc. are not always limited to those shown in the examples, and can be freely designed as needed.

[0044]

According to the present invention, the upper edge of the rice cooker is hung on the upper opening edge of the inner container to support the rice cooker, so that the bottom of the rice cooker floats from the bottom of the inner container. Therefore, it is avoided that the heavy load of the rice cooker acts on the portion of the magnetic field line transmitting material of the inner container and damages it.

The inner container is made of a magnetic field line transmitting material that transmits 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 heat generation efficiency is good and the inner container is By wrapping the rice cooker from below, it is possible to prevent the heat of the rice cooker, which is generated by the magnetic field lines from the induction heating coil that works effectively, from radiating to the outside, and at the same time, the heat is well stored in the inner container range. Since the heating of the cooked rice is efficiently performed from the entire area around the rice cooker, it is possible to obtain plump and delicious rice with good heat efficiency.

Further, the electronic component equipment section is located below the induction heating coil and is provided in the space around the bottom of the outer case to effectively utilize the space to prevent the overall size from increasing. The induction heating coil side is separated from the induction heating coil side by the heat shielding cover, and the heat influence from the induction heating coil side is less likely to occur, and the fan located on the same side prevents the induction heating coil side from the heat shielding cover. In an isolated 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 electronic component equipment part is prevented from rising in temperature. Even so, it is possible to 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 sectional view of an essential part showing a third embodiment of the present invention, FIG. 5 is a sectional view showing a fourth embodiment of the present invention, and FIG. 6 is a fifth embodiment 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, an upper side is opened to enclose the rice cooker from below, and a space 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, and placed 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 the electronic parts equipped part is provided under the induction heating coil, and an electronic parts equipped part that is isolated from the induction heating coil side by a heat shield cover is provided. Induction heating rice cooker.