JPS59214194A - Induction heating cooking device - 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 The present invention relates to an induction heating cooker having a heating coil for inducing eddy currents in a heated object.

As shown in FIG. 1, this type of induction heating cooker includes a heating coil 2 disposed below a heated object 1 made of metal or steel. A high frequency current is supplied to the heating coil 2 by an inverter circuit (not shown). Therefore, instantaneously, as shown in FIG.
As shown in the figure, a current (indicated by the symbol ri) flowing from the back to the front perpendicular to the page 1α and a fluid force in the opposite direction, ru71j
Since the current (indicated by the symbol ■) flows, a magnetic field in the direction of arrow 4 toward the heated object 1 is generated. Then, at the next moment, a current flows in the opposite direction, so that a magnetic field opposite to the direction of arrow 4 is generated. As a result, eddy currents are induced in the heated body 1 by the high-frequency magnetic field, so that heat is generated.

However, since the conventional induction heating cooker has only one heating coil as mentioned above, at 1 to f, only a magnetic field of 7 is generated in one direction, and The leakage magnetic flux was large, and it had the disadvantage of causing wave disturbances in the lasso etc. In particular, non-magnetic iron such as aluminum steel with low heating efficiency (magic coil 2 to heat the pot)
Increasing the supply '1E power to L7 increases radio wave interference.
That's too sweet.

The present invention is designed to reduce leakage magnetic flux (very small heating iiMJ).
The purpose is to provide medical equipment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 3 and 4, the induction heating cooker according to the present invention includes two heating coils 6, 6' disposed below the object to be heated 1. These heating coils 6.6
' are arranged adjacently in the same plane.

Thus, in an induction heating device 1j1'J having two heating coils 6.6', each heating coil 6 and 6' has a
High-frequency currents of the same amplitude and opposite phase are supplied from an inverter circuit (not shown). Therefore, as shown in FIG. When a current flows through the coil 6 in the opposite direction of arrow 3', as shown in FIG. A magnetic field opposite to the direction of arrow 5 is generated. Now, if these heating coils 6 and 6' have a flow 71z in the opposite direction to that shown in FIG. A magnetic field is generated respectively. Therefore, when a high-frequency magnetic field with the same amplitude and opposite phase is generated, each heating coil 6.6' Eddy currents corresponding to each high-frequency magnetic field are induced. On the other hand, the diameter of the heating coil 6.6' is very small compared to the wavelength of the high-frequency current, and each can be regarded as a minute loop.
At a position away from ', the canceling effect of magnetic fields of the same amplitude and opposite phase is large, and therefore the leakage magnetic flux 1d around the cooking device becomes extremely small.

Another embodiment of the invention is shown in FIG.

That is, in this embodiment, four heating coils 6.6', 6/, 6/ are arranged adjacent to each other in the same plane. The heating coil 6゜6 in the opposing position receives a high-frequency current with the same amplitude and the same phase, and the heating coils 6/, C, / in other opposing positions receive the same amplitude and opposite phase to the upper gL. A high frequency current is supplied to each.

FIG. 6 shows the relative interference wave (Nri magnetic flux) intensity obtained from experimental values. This intensity is shown as a pattern between 0 and 180 degrees in the horizontal plane. As is clear from this figure, the strength of the conventional induction heating cooker is 0.
(clB), the intensity is reduced by about 40 (dB) in a cooker with two heating coils and by about 60 (dB) in a cooker with four heating coils.

As explained above, according to the present invention, a plurality of heating coils are arranged adjacent to each other in the same plane, and a high frequency current of the same amplitude and opposite phase is supplied to each heating coil with respect to other adjacent heating coils. Therefore, leakage magnetic flux can be significantly reduced. Therefore, it is possible to provide an induction heating cooker that can heat a heated object with high power without affecting the surroundings by magnetic flux.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the heating coil of a conventional induction heating cooker, Fig. 2 is a plan view of the heating coil shown in Fig. 1, and Fig. 3 is an induction heating i+, + cooker according to the present invention. is a cross-sectional view of the heating coil; Figure aL4 is a plan view of the heating coil in Figure 3; Figure 5 is a plan view of another embodiment of the present invention;
The figure is a horizontal plane pattern diagram of relative interference wave intensity. 1.--Heated object, 2, 6, 6'... Heating coil. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Oiwa Masuga L Figure 2 Figure 4 Figure 6 Showa 111li 6j-15th Chief of Staff's Palace 1, y[t(7) display 4',) 1rlr1 1988-88
121;3. When extracted, each representative section includes the claims and detailed description of the invention of the specification to be amended. 6. Contents of amendment (]) The scope of claims in the specification is amended as shown in the attached sheet. 2) Same square, line 12 [Heating coil 6.6'J is corrected as "heating coil 6.6". Between lines 6 and 7 on page 5, it is sufficient that each heating coil car has the same electrical characteristics, and there may be structural differences such as terminal positions. ] Add. List of Additives Revised Patent Claims 1.2.Claims Claims: An induction heating cooking liquid including a plurality of heating coils to which high frequency current is supplied to induce a vortex 'fit flow in a heated object. An induction heating cooker characterized in that the high-frequency current is supplied to each heating coil with the same amplitude and opposite phase to other adjacent heating coils.

Claims (1)

[Claims] Vortex in heated object? An induction heating cooker including a plurality of heating coils to which a high frequency current is supplied to induce a +E current,
The plurality of heating coils are arranged adjacent to each other in the same plane, and each heating coil is supplied with the high-frequency current with the same amplitude and opposite phase to other adjacent heating coils. induction heating cooker.