JP3119402B2 - Induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, this type of induction heating cooker is disclosed in Japanese Patent Application Laid-Open Nos. 1-218411 and 1-2184.
No. 14 is known. These have a protective frame made of a non-magnetic material for detachably storing the inner pan in the main body, and an induction heating coil in which an electric wire is formed in a coil shape is disposed at the bottom or outer peripheral portion of the protective frame, and an inverter circuit is provided. In this configuration, the device is attached to the bottom of the main body. In addition, Japanese Unexamined Patent Application Publication
As shown in JP-A-189309, a protective frame made of a non-magnetic material for detachably storing an inner pot is provided in a main body, and an induction heating coil is disposed at the bottom of the protective frame. There is a configuration in which a heater case is provided to cover a heating coil and the bottom of a protective frame, and an inverter circuit device is attached to the heater case.

[0003]

The inverter circuit device for the induction heating cooker is a very heavy component,
In order to prevent the main body and the inverter circuit device from being damaged by a drop impact or the like when using the induction heating cooker or when carrying or handling a load on a distribution route, the inverter circuit device needs to be firmly supported. For this reason, in the former prior art, as shown in FIG. 3, a lower frame 13 (hereinafter referred to as a bottom) constituting a bottom of a main body is provided on a main body in which a protective frame 5 and an induction heating coil 1 are mounted on the protective frame 5. Although the bottom opening of the main body is closed by mounting, the inverter circuit device 7 is fixed to the bottom 13 and the inverter circuit device 7 and the induction heating coil 1 are connected.

In order to solve such a problem, in the latter prior art, there is a configuration in which the inverter circuit device is mounted not on the bottom side but on the protection frame side, but an induction heating coil is mounted on the bottom of the protection frame. Further, since the strength is insufficient to mount the inverter circuit device, it is necessary to separately provide a kiban case 14 for fixing the inverter circuit device 7 between the protection frame 5 and the outer frame 8 as shown in FIG. As another example, as shown in FIG. 5, a method of fixing an inverter circuit device 7 to a coil base 2 that fixes an induction heating coil 1 to a protective frame 5 is also known. Since the coil 7 is heavy, it is necessary to firmly fix the coil base 2 to the main body, and the coil base 2 becomes large.

Further, since the induction heating coil has a high temperature and a high voltage, a material having high heat resistance and insulation properties is required for a protective frame and a coil base for holding the coil. In addition, the protective frame is an external part because the inside can be seen when the lid is opened, and it is a part that shuts off the induction heating coil. It must not be. If the cracks occur, the user may touch the induction heating coil or water may enter, and the temperature is high and the voltage is very dangerous. For this reason, impact resistance and resistance to thermal and thermal destruction are required, and the materials constituting these are very expensive resins.

[0006] Therefore, these have a problem that the structure is complicated, the number of assembling steps is large, the cost is high, and it cannot be provided to the consumer at low cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an inner pot containing cooked food is produced by an alternating magnetic field generated from an induction heating coil connected to an inverter circuit device. In the induction heating cooker for heating cooking, a protective frame for storing the inner pan is provided which has a cylindrical shape with an upper opening and a bottom and forms an inner wall of the main body.・ Attaching a heating section including a bottom container made of an appropriate material having impact resistance, etc., and installing an inverter circuit device on the side opposite to the inner pot on the bottom of the protective frame, and the upper frame which is the upper surface of the exterior of the main body with the protective frame Or the upper frame portion and the outer frame portion.

[0008]

According to the structure of the present invention, the induction heating coil and the inverter circuit device via the bottom container made of a suitable material having a small amount of heat resistance, insulation and impact resistance can be provided in the protective frame without providing the kiban case. Attached, it is easy to connect the inverter circuit device and the induction heating coil and assemble the whole, and the alternating current flows to the induction heating coil by the inverter circuit device, and cooking without overheating the protection frame that integrally configures the main body appearance We can cook inner pot which put thing.

[0009]

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 cross-sectional view of an induction heating cooker according to an embodiment of the present invention, showing an example of a rice cooker. FIG. 2 is a sectional view of an induction heating cooker according to another embodiment of the present invention.

Referring to FIG. 1, the configuration will be described in accordance with an assembling procedure. The induction heating coil 1 is fixed to a bottom container 3 by a coil base 2 to form an integral heating section 4.
The heating unit 4 is fixed to the upper surface of the bottom of the protection frame 5. The protection frame 5 is fixed to the lower surface of the upper frame 6 of the main body, and the inverter circuit device 7 is attached to the lower portion of the bottom of the protection frame 5.
A terminal (not shown) of the induction heating coil 1 is electrically connected to the inverter circuit device 7.

An outer frame 8 is attached below the upper frame 6,
A lid 9 is mounted on the upper frame 6 so as to be openable and closable, and constitutes an external appearance of the main body. An inner pot 10 is detachably inserted into the protective frame 5. A plurality of ferrites 11 are previously mounted on the surface of the coil base 2 opposite to the induction heating coil 1 so that the alternating magnetic field generated by the induction heating coil 1 does not adversely affect the inverter circuit device 7.
Absorbs the downward magnetic field.

In FIG. 2, the induction heating coil 1 is attached to the bottom container 3 by bonding or the like without using a coil base, and the protective frame 1 is attached.
2 is formed integrally with the upper frame 6 of the protective frame 5 and the upper portion of the outer frame 8 in FIG. 1. The inverter circuit device 7 and the ferrite 11 are fixed to the protective frame 12. An outer frame lower part 13 is fixed, and the other configuration is the same as that of FIG.

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

A user puts an appropriate amount of rice and water into the inner pot 10,
When the rice cooker is stored in the protective frame 5, the lid 9 is closed, and a rice cooker switch (not shown) is operated, a rice cooker operation is started. An alternating magnetic field is generated by the inverter circuit device 7 and the induction heating coil 1, and when this magnetic field passes through the inner pot 10, an eddy current is generated in the inner pot 10 and converted into Joule heat by the electric resistance of the inner pot 10. Fever. Thereby, rice and water are heated and cooked. This operation and the heating principle are the same as those of the conventional example in the above configuration.

Since the induction heating coil 1 does not touch the protection frame 5, the protection frame 5 can be made of a general inexpensive resin, for example, polypropylene, and the bottom container 3 that touches the induction heating coil 1 uses an expensive resin. Inevitably, the size can be reduced to a dish, so that the amount of material used can be greatly reduced, and the structure can be reduced in cost as compared with the conventional example.

Further, since the inverter circuit device 7 can be fixed to the protection frame 5 which is firmly fixed to the upper frame 6, the kiban case as in the conventional example is not required, and the induction heating coil 1 and the inverter circuit device 7 are protected by the protection frame. 5, the connection work can be easily performed, and the configuration can be further reduced.

Further, since the coil base 2 has only the function of holding the induction heating coil 1 and the ferrite 11 and does not fix the inverter circuit device 7 to the coil base 2, the coil base 2 which requires expensive materials can also be miniaturized. It can be made and can be constructed at low cost. Also, as shown in FIG. 2, the induction heating coil 1 is fixed to the bottom container 3 by bonding or the like, and the ferrite 1
If 1 is fixed to the bottom of the protective frame 12, the coil base 2 becomes unnecessary, and the protective frame 12 can be made of a general inexpensive resin, so that it can be formed integrally with the upper frame and the upper part of the outer frame. It is also possible to reduce the number of parts and to make the configuration significantly cheaper. In the conventional configuration, an expensive material must be used for the protective frame, and consequently, when integrated, it becomes expensive, so that no effect is obtained.

[0018]

As described above, according to the present invention, a bottom container made of a suitable material having a small amount of heat resistance, insulation, impact resistance, and the like, a heating unit made up of an induction heating coil, and the like are attached to the top surface of the bottom of the protection frame. Since the inverter circuit device is mounted on the bottom surface of the bottom, that is, by mounting the heating unit and the inverter circuit device so as to sandwich the bottom of the protection frame, both can be firmly fixed to the bottom of the protection frame, so the amount of expensive material used Can be reduced, the number of parts such as kiban case etc. can be reduced and a simple configuration can be achieved.
Since the protective frame does not require special heat resistance, insulation and impact resistance, it is possible to integrate the upper frame, outer frame and protective frame with inexpensive materials, etc. There is an effect that an induction heating cooker as a rice cooker can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an induction heating cooker showing an example of a rice cooker according to an embodiment of the present invention.

FIG. 2 is a sectional view of an induction cooking device showing another embodiment of the present invention.

FIG. 3 is a sectional view of an induction heating cooker showing a conventional example.

FIG. 4 is a sectional view showing another conventional example.

FIG. 5 is a sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction heating coil 3 Bottom container 5, 12 Protection frame 7 Inverter circuit device 10 Inner pan

Claims (3)

(57) [Claims] An alternating magnetic field generated from an induction heating coil (1) connected to an inverter circuit device (7)
An induction heating cooker for heating and cooking an inner pot (10) containing cooked food, comprising a protective frame (5) which has a cylindrical shape with an upper opening and a bottom, forms an inner wall of a main body, and stores the inner pot (10); On the inner pan (10) side of the bottom surface of the protective frame (5), a heating unit (4) including the induction heating coil (1) and a bottom container (3) made of a suitable material having excellent heat resistance, insulation, impact resistance and the like. And an inverter circuit device (7) attached to the bottom of the protective frame (5) opposite to the inner pot (10). 2. The induction heating cooker according to claim 1, wherein a protective frame (12) is integrally formed with the upper frame portion and the outer frame portion, which are the upper surfaces of the external appearance of the main body. 3. The induction heating cooker according to claim 1, wherein a protective frame is formed integrally with the upper frame portion which is the upper surface of the external appearance of the main body.