JPH084031B2 - Cooking device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a cooker which is used in general households, etc., and which is equipped with an induction heating source and heats and cooks an object to be cooked in a pan.

2. Description of the Related Art Generally, as a cooking device that is equipped with an induction heating source and cooks an object to be cooked in a pan, a cooking device having the following structure is known. That is, in FIG. 2, 101 is a cylindrical outer case having upper and lower surfaces opened, and a bottom plate 103 having support legs 102 is fixed to the lower surface of the outer case 101 by screwing. Reference numeral 104 denotes a pot storage portion formed of, for example, heat-resistant plastic, and the pot storage portion 104 has a flange portion 104a provided at the upper end thereof fixed to the upper surface of the outer case 101 by screwing. Reference numeral 105 denotes a first induction coil embedded in the side surface portion 104b of the pan storage portion 104 by integral molding, and 106 denotes a second induction coil embedded in the bottom surface portion 104c of the pan storage portion 104 by integral molding. Ten
7 is a magnetic material, for example, an iron pot, which is the pot compartment 104
It is removably placed on the bottom surface 104c of the. Reference numeral 108 denotes, for example, a magnetic thermostat fixed via a support plate 109 in a through hole 104d provided at the center of the bottom surface portion 104c of the pan storage portion 104, and the thermosensitive portion 108a of the thermostat 108.
The spring is biased upward by a spring (not shown) so as to come into close contact with the bottom portion 107b of the pot 107. 110 is a temperature detection switch that detects the temperature of the side surface 107a of the pan 107, and has a heat-sensitive part 110a such as a thermistor.
It is inserted into the insertion hole 111 provided in the side surface portion 104b of 04, and is constantly urged by the spring 112 in the direction of the pan 107, and is always urged by the spring 112 in the direction of the pan 107. Furthermore, the tip of the heat-sensitive part 110a is a pan.
The side surface 107a of 107 is crimped. Reference numeral 113 is a lid having a knob 114, and the lid 113 is a collar portion 1 of the pot storage portion 104.
It is removably placed on 04a. Reference numeral 115 denotes a control board fixed to the upper surface of the bottom plate 103, in which a part of the electric circuit is arranged.

The electric circuit includes an inverter circuit that uses an induction coil as a resonance coil, a drive circuit that drives them, a control circuit (especially a microcomputer) that controls cooking, and an operation unit.

Problems to be Solved by the Invention Since the above-described conventional cooking device uses the induction heating method, a large amount of magnetic flux is generated by the high-frequency current flowing in the induction coil. The magnetic pot heats up by the eddy current generated by cutting this magnetic flux and cooks the food in the pot.The generated magnetic flux not only heats the pot, but also affects the surrounding metal materials. Exert. In particular, an electric circuit has a problem in that a signal is picked up as noise including a high frequency component and the control circuit malfunctions.

In the past, in order to prevent this, measures such as shielding with an aluminum plate for magnetic shielding were taken, but it could not be said to be a sufficient measure.

The present invention solves such a problem, and an object of the present invention is to provide a cooker which does not use an aluminum plate or the like for magnetic shielding and has a structure capable of sufficiently resisting noise and the like generated from an induction coil. It is a thing.

Means for Solving the Problems In order to solve the above problems, a cooking device according to the present invention includes a cooking device main body, a pan that is detachably accommodated in the cooking device main body,
A lid body that covers the cooker body so as to be openable and closable, and a protective frame that fixes an induction coil facing the pot outer peripheral portion are provided, and an induction heating substrate that oscillates and drives the induction coil as a resonance coil is provided at the bottom of the body, In addition, the operation control unit and the control board are provided on the lid.

Operation According to the above configuration, since the induction heating board for oscillating and driving the induction coil as the board coil and the operation control section / control board are separately mounted, the magnetic flux generated by the induction coil is generated by the operation control section and the control board. Will no longer affect. That is, the magnetic flux only affects the vicinity of the induction coil, and the farther it is from the induction coil, the smaller its force becomes. Further, since there is a protective frame, a pot, a cooker body, etc. between the induction coil and the operation control unit and the control board, magnetic flux does not affect the operation control unit and the control board.

In addition, attaching the operation control unit and control board to the lid means that you used to bend down to use it until now, but this time you can see the operation unit from above, so it is very convenient. It will be good.

Example Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a cooker according to an embodiment of the present invention. In FIG. 1, a protective frame bottom portion 3 and a protective frame side surface portion 4 which form a storage portion for a pan 2 are arranged inside a substantially cylindrical cooker body 1. The bottom 3 of the protective frame is formed of a non-metallic material, for example, a thermoplastic, and an undercut receiving portion A6 which is coupled to the flange A5 on the bottom side of the side 4 of the protective frame is provided on the upper portion of the protective frame bottom portion 3 to reduce impact resistance. Even non-metallic materials are bonded together so that the bonding strength increases.
On the other hand, the protective frame side surface portion 4 is formed of a metal material, for example, an aluminum-plated steel plate, and a flange A5 and a flange B7, which are subjected to strength by outwardly facing flanges, are provided on the bottom portion and the upper portion, respectively. As described above, the flange B7 is connected to the receiving portion A6 of the protective frame bottom portion 3, and the flange B7 is connected to the undercut receiving portion B9 of the upper frame 8. The pot 2 is formed of, for example, a clad steel plate having an outer surface made of a magnetic material, and is supported by bringing the pot flange 10 into contact with the upper frame 8.

Reference numeral 11 denotes an induction coil. This induction coil 11 is arranged on the outer surface of the protective frame bottom portion 3 so as to face the bottom portion of the pan 2 and has a protective frame cover 12 screwed to the protective frame bottom portion 3 in order to enhance the cooling effect. Holding in between. A ferrite 13 is attached to the outer surface of the protective frame cover 12 to enhance the inductive coupling and to prevent the outside from being magnetized. Here, between the lowest part of the protective frame side surface part 4 and the uppermost part of the induction coil 11
They are arranged at intervals of 15 to 30 mm. In this case, the protection frame side face 4 does not abnormally heat due to induction heating, and has the longest dimension in order to reduce the cost. On the outer surface of the side surface portion 4 of the protective frame, for example, a heater 14 having an insulating coating is attached, and a thermal fuse 15 which is a heat-sensitive operating body for cutting off the circuit at an abnormal temperature is attached by a fixing metal fitting 16. Outer case of cooker body 1
Between the 1a and the side surface 4 of the protective frame, a heat insulating material 17 is filled above the induction coil 11 to improve heat retention performance and prevent temperature rise of the outer case 1a.

A resin lid 18 is supported on the upper frame 8 of the cooking device 1 so as to be openable and closable via a pin 20 by a hinge portion 19 integrally formed with the upper frame 8. A handle is provided on the upper surface of the lid 18.
21 is provided, and an inner cover 22 is fixed to the inner surface via a heat insulating material 23. An engaging portion 24 is integrally formed on a portion of the upper frame 8 located on the opposite side of the hinge portion 19, and an engaging lever 25 is rotated via a pin 26 on the lid body 18 in opposition thereto. When the lid 18 is closed, the engagement lever 25 is urged by the spring 27 to engage the engagement lever 25 with the engagement portion 24. When the lid 18 is opened, the button 28 attached to the engagement lever 25 is operated.

Support pins are provided on the lower surface side of the inner cover 22 on the lower surface of the lid body 18.
29, the inner lid 30 is attached to the support pin 29 so as to be vertically movable, and the packing 31 constantly urges the inner lid 30 downward so that the lid body
When 18 is closed, it is pressed against the pan 2 to close the pan 2.

An operation control section 31 is attached to the inner surface of the lid 18 so as to penetrate the operation surface upward, and the lid 18
A control board with a microcomputer 32 wired inside
33 is fixed. And the role of this control board 33 is
The temperature is detected by the sensor 34 which is in thermal contact with the bottom of the pan 2, and a signal is sent to the induction heating substrate 35 provided on the bottom of the cooker body 1 to control the power of the induction coil 11 and the heater 14. There is.

In the cooker having the above structure, for example, when cooking rice, put a proper amount of rice and water in the pot 2 and press a switch on the operation panel (not shown) to turn on the electricity to detect the temperature of the sensor 34 and the electricity. The induction coil 11 and the heater 14 can be power-controlled by the program of the circuit to cook rice and keep warm. When a current flows through the induction coil 11, the magnetic flux (not shown) generated there is slightly leaked though it is prevented from leaking to the outside by the ferrite 13. The leaked magnetic flux (not shown) may flow as a large noise in a portion of the signal system where a weak current flow is required. According to the present invention, the control board 33 (particularly the microcomputer 32) for controlling these signal systems is provided in the lid 18 and separated from the induction coil 11 to prevent noise generated therein. As a result, malfunctions during rice cooking can be prevented, and stable performance can always be obtained.

EFFECTS OF THE INVENTION As is clear from the description of the above embodiments, the cooker of the present invention separates the induction heating substrate that drives the induction coil as the resonance coil for oscillation, the operation control unit and the control substrate, and the induction heating substrate is Since it is provided on the bottom of the cooker main body and the operation control unit and control board are provided on the lid, it is possible to protect the operation control unit and control board from noise due to the magnetic flux generated from the induction coil. Since there is no malfunction occurring in the above, stable performance can always be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a cooker according to an embodiment of the present invention, and FIG.
The figure is a cross-sectional view of a cooking device showing a conventional example. 1 ... cooker body, 2 ... pan, 3 ... protective frame bottom, 4 ...
… Protective frame side, 11 …… Induction coil, 14 …… Heater, 18
...... Lid, 31 ...... Operation control part, 32 ...... Microcomputer, 33 ...... Control board, 35 ...... Induction heating board.

Claims (1)

[Claims] 1. A cooker main body, a pan that is detachably accommodated in the cooker main body, a lid that covers the cooker main body so that the cooker main body can be opened and closed, and an induction coil facing the outer peripheral portion of the pan. A cooking device comprising a frame, an induction heating substrate for oscillating and driving the induction coil as a resonance coil, provided on the bottom of the main body, and an operation control unit and a control substrate provided on the lid.