JPH01315979A - induction heating rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooking device that is used in general households and is equipped with an induction heating source to cook food by placing it in a pot.

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2. Description of the Related Art In general, a cooking device equipped with an induction heating source and used to cook food in a pot has a structure as shown in FIG. are known. That is, in this Figure 3,
Reference numeral 101 denotes a cylindrical outer case with open upper and lower surfaces, and a bottom plate 103 having support legs 102 on the lower surface of the outer case 1o1.
is fixed with screws. 104 is a pot storage section made of heat-resistant plastic, for example;
This pot storage section 104 has a flange section 1042 provided at its upper end.
L is fixed to the upper surface of the outer case 101 by screws. 105 is a first induction coil embedded in the side surface 104b of the pot storage section 104 by integral molding;
106 is a second induction coil embedded in the bottom portion 104C of the pan storage portion 104 by integral molding. In addition,
These induction coils 105 and 106 are spaced apart by 10EiJ1 as shown in FIG.
06N is formed. Reference numeral 107 denotes a pot made of a magnetic material, for example, a portion of iron.

Reference numeral 108 denotes a magnetic thermostat, for example, which is fixed through a support plate 109 in a through hole 104d provided at the center of the bottom surface 104C of the pot storage section 104. It is urged upward by the handle 107 and comes into close contact with the bottom part 10ab of the pot 107. Reference numeral 110 denotes a temperature detection switch having a heat sensitive part 110a made of, for example, a thermistor, which detects the temperature of the side part 107a of the pot 107. Insertion hole 1 provided in 104b
11 and is always urged in the direction of the pot 107 by a spring 112.
The tip of 01L is crimped to the side surface 107a of the pot 107. 113 is a lid having a recess 114, and this lid 113 is removably planted on the second side of the flange 104a of the pot storage section 104. Reference numeral 115 denotes a control board fixed to the upper surface of the bottom plate 103, on which a part of the electric circuit is disposed.

Problems to be Solved by the Invention In the above-mentioned conventional cooker, a heat-resistant plastic pot storage part 104 is formed inside the double-walled main body, and an induction coil 1Q5°106 that self-heats with a large current is installed in the pot storage part. 104 by integral molding. Further, the buried induction coils 105 and 106 form a fixed interval, so that FIGS. 4a and 4b
It is necessary to mold the induction coils 105, 106 with constant intervals 106a, 106& as shown in FIG.
．． 106 is held in a mold and molded with a heat-resistant resin, but the deformable induction coil 10511o6 made of copper wire is molded and held so as to have a constant interval 105a, 106 &. was extremely difficult and had poor workability. It is very delicate to handle, and at the same time, even when molded with heat-resistant resin, it is easily deformed by the flow of high resin pressure, which is a characteristic of molding these heat-resistant resins. Therefore, it was difficult to maintain the initial shape, resulting in an extremely high defect rate.

And the induction coil 10 molded in resin in this way
When energized, the pot accommodating portion 104 undergoes expansion and contraction, such that it becomes high temperature due to self-heating and simultaneously causes linear expansion, and when the energization is stopped, it becomes low temperature and contracts, and so on. Internal distortion and even cracking occur, resulting in the induction coils 105 and 106
There is also a problem where the metal is exposed and there is a risk of electric shock.

Furthermore, since the position of the first induction coil 105 is fixed, the top surface 115 of rice, which is the food placed in the pot 107, is not always constant. Not only is it impossible to effectively raise the temperature of the food because the upper air layer where there is no food to be cooked is heated, but there is also a significant loss of time and electricity. The heating of the pan 107 due to the energization of the induction coils 106 is concentrated due to the mutual effect of the respective induction coils 105 and 106, and therefore, as shown by the temperature distribution line 116 in FIG. 3, the heating concentration position 116L is generated.

116b is generated, and as a result, there is a problem that uniform cooking cannot be achieved.

The present invention solves the above-mentioned conventional problems, and aims to provide a cooker that is easy to assemble, ensures safety, and improves cooking performance. .

Means for Solving the Problems In order to solve the above problems, the cooking device of the present invention includes a cooking device main body and a cylindrical protective frame arranged inside the cooking device main body and constituting a pot storage section. The protective frame is made of a non-metallic material, and an induction coil is arranged at the lower part of the outer surface and the lower surface of the bottom of the protective frame.

Further, in the present invention, each of the induction coils is tightly wound spirally, and the winding ratios are approximately the same.

Function: The induction coil configured as described above can be molded individually without being molded in heat-resistant resin, etc., and the molded pieces can be stacked and assembled. Since the protective frame is no longer subject to distortion caused by the self-heating of the induction coil, the pan storage section will not be destroyed, improving safety. It can be easily manufactured by winding it around a molding jig, and by providing induction coils separately on the lower part of the outer surface and the lower part of the bottom of the protective frame, the mutual effect of heat generated by the two induction coils is Heat concentration can be effectively dispersed.

Furthermore, by making the winding ratios of the induction coils provided at the lower part of the outer surface of the protective frame and the lower surface of the bottom substantially equal, the temperature distribution of the heated pot is made uniform, and the cooking performance is improved.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view showing a rice cooker according to an embodiment of the cooking device of the present invention. In FIG. A cylindrical protective frame 3 is disposed, and the protective frame 3 is molded from a non-metallic material, such as thermoplastic, and a heat insulating material 5 is disposed between it and the main body 1 on the outside. Main body 1
It is fitted onto the top of the The pot 2 is made of a clad steel plate having a magnetic outer surface and aluminum with good thermal conductivity, for example, and its upper end flange portion 2a is placed on the upper end flange portion 3a of the protective frame 3. Supported by

A side induction coil 6a is disposed outside the lower outer surface 3b of the protective frame 3, and a bottom induction coil 6b is disposed on the bottom lower surface 3c of the protective frame 3. It is held between the protective frame cover 7 and the protective frame 3 which are screwed together.

The outer surface of the neck protection frame cover 7 is coated with ferrite 8 at 91,
-) After installation, this ferrite 8 increases inductive coupling and provides magnetic shielding to the outside.

A lid 9 made of resin is supported on the upper part of the cooking device main body 1 via a shaft 10 by a hinge portion 3d integrally formed with the protective frame 3 so as to be openable and closable. A grip portion 11 is provided on the upper surface of the lid 9, and a lower portion of the inner surface of the lid 9 has a double structure with an inner cover 12 and a heat sink 13, and a lid heat insulating material 14 is disposed inside. Further, a coupling part 3e is integrally molded on the protection frame 3 and located on the opposite side to the hinge part 3d, and an engagement lever 15 is rotatably mounted on the lid body 9 opposite to this coupling part 3e via a pin 16. When the lid 9 is closed, an engagement lever 15 of the lid 9 is engaged with the coupling portion 3e by a spring 17. In addition, when opening the lid 9, the engagement lever 15 and the connecting portion 3e are disengaged by operating the button 18 several times on the engagement lever 15.

Reference numeral 19 denotes a support pin protruding downward from the center of the heat dissipation plate 13 located on the lower surface of the lid body 9. An inner lid 20 is attached to this support pin 19 by a gasket 21 and is moved up and down 10.

The base 7 is freely and removably attached, and this inner lid 2
The lid body 9 is biased downward by the Q-packet 21.
When the pot 2 is closed, the outer periphery of the inner lid 20 comes into pressure contact with the pot 2.
It is something that blocks the. Further, on the upper surface of the heat dissipation plate 13, for example, a lid heater 22 coated with insulation is pasted, and its lead wire (not shown) is connected to a control circuit 22 provided in the cooking device main body 1 through a hinge portion 3d. It is connected to the.

Further, the temperature of the pot 2 is sensed by a thermistor 25 via a contact 24 which is brought into contact with the bottom of the pot 2, and these are constantly biased in the direction of contacting the pot 2 by a sensor spring 26. The temperature information sensed by the thermistor 26 is transmitted to the control circuit 23, so the control circuit 23 controls the power of the side induction coil 6a, bottom induction coil 6b, heater 22, etc. to cook and keep the rice warm. .

FIG. 2 is a perspective view showing the shapes of the side induction coil 6a and the bottom induction coil 6b. In this FIG. and these are connected from the side induction coil 6a to the bottom induction coil 6b.
It consists of a coil of books. The side induction coil 6a and the bottom induction coil 6b have the same winding ratio of 10 turns:1C turns, respectively.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention,
The cylindrical protective frame that makes up the pot storage part is made of non-metallic material, and induction coils are placed on the lower outer side and bottom of the protective frame. Because the molded parts can be molded individually and then stacked and assembled, the assembly workability is extremely good, and the expansion and contraction of the induction coil due to the repeated heating and cooling of the induction coil can be avoided. However, since this does not occur as a distortion of the protective frame, safety can also be ensured.

In addition, since each induction coil is tightly wound spirally, this induction coil can be easily manufactured by winding it around a forming jig having a fixed interval corresponding to the diameter of the induction coil. The finished product and dimensions are stable, which also leads to stable heating conditions.
As a result, it becomes possible to achieve stable and uniform performance and quality.

Furthermore, since the winding ratios of the induction coils installed at the lower part of the outer surface of the protective frame and the lower surface of the bottom are almost the same, the heat distribution due to the mutual effect of each induction coil in the temperature distribution from the bottom of the pot to the rising part around it is The concentration will be distributed to four locations, and as a result, heating unevenness will be reduced and uniform heating will be possible, thereby improving cooking performance.

These induction coils are placed at the bottom of the outer surface of the protective frame and the bottom of the bottom, so regardless of the amount of food stored in the pot, heating can be achieved from the bottom of the pot and the surrounding area. This makes it possible to cook efficiently and without waste.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal cross-section 13 of a cooking device showing an embodiment of the present invention.
−. A top view, FIG. 2 is a perspective view showing the shape of the induction coil used in the cooking device, and FIG. 3 is a sectional view of the conventional cooking device.
FIGS. 4a and 4b are perspective views showing the shape of the induction coil in the cooking device. 1... Cooker body, 3... Protective frame, 3b.
... Lower part of the outer surface of the protective frame, 3C ... Lower surface of the bottom of the protective frame, 6a ... Side guide Koinope 6b ...
・Bottom induction coil 0

Claims (3)

[Claims] (1) It comprises a cooking device main body and a cylindrical protective frame arranged inside the cooking device main body and constituting a pot storage section, the protective frame is made of a non-metallic material, and the protective frame is made of a non-metallic material. A cooker with induction coils placed on the lower part of the outer surface and the lower part of the bottom. (2) Claim 1 in which the induction coils arranged at the lower part of the outer surface and the bottom of the protective frame are each arranged in a tightly wound spiral manner.
Cooker mentioned. (3) The cooking appliance according to claim 1, wherein the induction coils have substantially the same winding ratio and are arranged at the lower part of the outer surface and the bottom of the protective frame.