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An electromagnetic induction rice cooker

An electromagnetic induction and rice cooker technology, applied in induction heating, induction heating control, induction heating device and other directions, can solve the problem of difficulty in eliminating uneven cooking of rice, and achieve the effect of reducing uneven cooking of rice

Active Publication Date: 2019-01-15
HITACHI APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the technique described in Patent Document 1 is difficult to eliminate the problem of uneven cooking of rice

Method used

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  • An electromagnetic induction rice cooker
  • An electromagnetic induction rice cooker
  • An electromagnetic induction rice cooker

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A first embodiment of the present invention will be described using the drawings. figure 1 It is a structural diagram cut off by a quarter of the electromagnetic induction heating electric rice cooker according to the first embodiment of the present invention. In the electromagnetic induction rice cooker 10 , an inner pot 1 is detachably accommodated in a bottomed cylindrical main body with an upper opening (not shown), and the main body and the upper part of the inner pot 1 are covered by a cover. A spirally wound heating coil 2 is disposed below the inner pot 1 , and a rod-shaped ferrite 3 is radially disposed below the heating coil 2 . A shield plate 4 is arranged under the ferrite 3 . An inverter circuit board 5 that supplies high-frequency current to the heating coil 2 is disposed below the shield plate 4 . The radiation magnetic field generated by the heating coil 2 is shielded by the shield plate 4 to prevent malfunction of the inverter circuit board 5 . Semic...

Embodiment 2

[0067] Next, use Figure 13 A second embodiment of the present invention will be described. Figure 13 It is a sectional view which shows the structure of the inner pot of 2nd Example of this invention. The difference from the first embodiment is that the thickness of the magnetic body layer 24 is continuously formed, and a slope is formed at a portion where the thickness changes. That is, the magnetic layer 24 is formed to have a different thickness in the radial direction. The innermost surface layer of the inner pot 1 is formed of an aluminum layer 11, the magnetic layer 24 is formed on the surface, and the non-magnetic metal layer 13 is formed on the outermost surface. The inner pot 1 is composed of a three-layer structure of an aluminum layer 11 , a magnetic layer 24 , and a nonmagnetic metal layer 13 .

[0068] Ferrite is used for the magnetic layer 24 . AlSi in which silicon is added to aluminum is used for the non-magnetic metal layer 13 on the outermost surface. ...

Embodiment 3

[0073] Next, use Figure 14 A third embodiment of the present invention will be described. Figure 14 It is a plan view of the bottom of the inner pot 1 of the third embodiment of the present invention. The difference from the first embodiment and the second embodiment is that the thickness of the magnetic layer is formed differently in the circumferential direction. Figure 10 In the bottom of the inner pot 1, the magnetic layers 24 and 25 are fan-shaped. These magnetic layers have a structure in which the magnetic layer 24 is thick and the magnetic layer 25 is thin. Furthermore, the magnetic layers 24 and 25 having different thicknesses of the magnetic layers are alternately arranged in the circumferential direction. By employing such a configuration, it is possible to change the heat generation distribution according to the heating coil current. In the state where the current of the heating coil is low, there is no magnetically saturated region, the magnetic flux interl...

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PUM

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Abstract

An electromagnetic induction rice cooker which can reduce nonuniform rice cooking is provided. The rice cooker includes an inner port detachably accommodated in the main body, a heating coil (2) disposed below the inner pot, and an inverter circuit board supplying electricity for the heating coil (2). A non-magnetic metal layer (13) is formed at the bottom of the inner pot (1), and a plurality ofmagnet layers (12) different in thickness are formed between the inner port and the non-magnetic metal layer (13). In addition, on the basis of the abovementioned structure, the plurality of magnet layers (12) are different in radial thickness, and the thickness relation of the plurality of magnet layers (12) meets t3>t1>t2.

Description

technical field [0001] The invention relates to an electromagnetic induction electric rice cooker. Background technique [0002] In recent years, a rice cooker employing a high-frequency electromagnetic induction device as a heating unit for heating an inner pot of the rice cooker has become mainstream. In the case of an electromagnetic induction rice cooker, an eddy current is generated in the inner pot by a high-frequency magnetic field generated by a heating coil, and Joule heat generated by the current generates heat in the inner pot. The heating coil is arranged on the lower part of the inner pot in a planar shape. Since the induced magnetic field generated by the heating coil is concentrated on the upper part of the heating coil, the boiling part is also locally concentrated. In the case of concentrated boiling in a local area, it boils upward from a local area, so the temperature of the whole rice becomes uneven, and there is a problem that the rice is cooked uneven...

Claims

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Application Information

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IPC IPC(8): H05B6/12H05B6/06A47J27/00A47J36/24A47J36/02
CPCA47J27/00A47J36/02A47J36/2483H05B6/062H05B6/12
Inventor 宇留野纯平佐藤史宏金子哲宪
Owner HITACHI APPLIANCES INC