JPH07282973A - High frequency heater device - Google Patents

Abstract

PURPOSE:To enhance the performance of uniform heating operation by eliminating unevenness in heating a material to be heated. CONSTITUTION:A material to be heated is placed on a tray made of dielectric substance, which is supported rotatably by a rotary table consisting of a metal disc having slits 6d in a mesh form. Thus a high frequency heater device is formed, wherein a plurality of bow-shaped slots 6a, 6b approx. one half of the wavelength lambda are provided in the rotary table 6 in the circumferential arrangement with different radii R1, R2. This prevents concentration of high frequency waves and guides the waves under the table 6 to the undersurface of the material 5 effectively, and further there is no risk of over-heating of the upper part of the material, and also insufficient, heating of the lower part can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of uniform heating of a high-frequency heating device for heating and cooking food by using high-frequency energy.

[0002]

2. Description of the Related Art In a high-frequency heating apparatus in which an object to be heated is placed on a saucer made of a dielectric material, and the saucer is rotatably supported by a turntable made of a metal disk, the turntable is arranged in the circumferential direction. There is a bow-shaped slot provided to improve the effect of uniform heating (see Japanese Utility Model Publication No. 62-40557).

[0003]

In the above conventional technique, when a heater is provided above the heating chamber and the power supply port is provided only on the side wall of the heating chamber, as shown in FIG. 3, bottles and milk bottles are provided. When placed in the center of the saucer by itself, the high frequency waves are reflected by the bottom of the heating chamber instead of being reflected by the rotating table due to the slots, so there is little temperature rise in the bottle and the upper part of the milk bottle There is no difference, that is, there is no heating unevenness, but as shown in Fig. 4, when two bottles of sake bottle and milk are heated, the high frequency reflected by the rotating table raises the temperature of the constricted part of the upper part, and heating unevenness is likely to occur. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, in which an object to be heated is placed on a tray made of a dielectric material, and a rotation is made of a metal disk having mesh slits. In a high-frequency heating device in which a saucer is rotatably supported by a table, a plurality of arc-shaped slots having a half of the wavelength λ used are bored along the circumferential direction of different radii of the rotating table to heat the saucer. It is a structure that eliminates unevenness and enables uniform heating.

[0005]

With the above structure, the arc-shaped slots are provided along the circumference of the circle having different radii, so that the high frequency is prevented from concentrating and enters the lower part of the metal rotary table. The generated high frequency waves are efficiently guided to the lower surface of the object to be heated, and there is no overheating of the upper part of the object to be heated, and insufficient heating of the lower part of the object to be heated is eliminated, so that there is no uneven heating and heating is uniform.

[0006]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part of a high frequency heating apparatus showing an embodiment of the present invention.

In the figure, reference numeral 1 is a high frequency oscillator for generating a high frequency. Reference numeral 2 is a waveguide for transmitting a high frequency, which connects the high frequency oscillator 1 and the heating chamber 3. Reference numeral 4 denotes a tray made of a dielectric material on which the object to be heated 5 is placed, which is rotatably supported by a metal rotary table 6. Reference numeral 7 denotes a drive shaft made of a metal rod that detachably connects a rotary shaft 6c made of a metal pipe of the turntable 6 and is connected to a motor 8.
Reference numeral 9 is a heater provided above the heating chamber 3.

FIG. 2 is a top view of the turntable 6 as seen from above.

In the figure, reference numeral 6a designates an arcuate slot having a plurality of lengths L1 along the circumference of a circle having a radius R1 of the turntable 6 (in the figure, they face each other with the center of the turntable 6 interposed therebetween. It is drilled at two positions). 6b is an arcuate slot having a plurality of lengths L2 along the circumference of the circumference of the turntable 6 having a radius R2 (in the figure, two slots are formed at a set distance. Has been done). Here, the length L of the bow-shaped slots 6a and 6b indicated by the arrows
1 and L2 are each about 1/2 of the used wavelength λ (practically about 1/2 to 2/3). 6d is a slit formed in a mesh shape.

Next, the operation of this embodiment will be described.

As described above, the plurality of bow-shaped slots 6a and 6b formed on the circumference of the metal rotary table 6 having different radii R1 and R2 function as slot antennas, as shown in FIG. In the case of Sake bottle 5 and milk bottle, the high frequency is prevented from concentrating on the upper part, and in the case of meat block 5, the high frequency entering the lower part of the metal rotary table 6 is efficiently guided to the lower surface of the object to be heated 5. , The dielectric pan 4 and the metal turntable 6
Even when the object 5 is rotatably supported, the upper part of the object to be heated 5 is not overheated and the lower part of the object to be heated is not overheated, and the object 5 is uniformly heated without uneven heating.

[0013]

As described above, according to the present invention, an object to be heated is placed on a tray made of a dielectric material, and the tray is rotatably supported by a turntable made of a metal disc having mesh-like slits. In the high-frequency heating device, a plurality of arc-shaped slots of about ½ of the working wavelength λ were bored along the circumferential direction of different radii of the turntable to prevent high-frequency concentration and prevent rotation of the metal rotation. The high frequency waves that have entered the lower part of the table are efficiently guided to the lower surface of the object to be heated, there is no overheating of the upper part of the object to be heated, and the insufficient heating of the lower part of the object to be heated is eliminated, and there is no uneven heating, and uniform heating is further improved. And a high-frequency heating device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a high-frequency heating device showing an embodiment of the present invention.

FIG. 2 is likewise a top view of the turntable.

FIG. 3 is a sectional view of a main part of a high-frequency heating device showing a conventional example.

FIG. 4 is a cross-sectional view of a main part of a high-frequency heating device showing another conventional example.

[Explanation of symbols]

 1 high frequency oscillator 2 waveguide 3 heating chamber 4 saucer 5 object to be heated 6 turntable 6a bow-shaped slot 6b bow-shaped slot 6d slit L1 length of slot 6a L2 length of slot 6b R1, R2 radius 9 heater

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keimitsu Itami 3-3 Shinjuyoji, Kashiwa-shi, Chiba Pref. Within Hometec Co., Ltd. (72) Takanori Abe 1 3 Shinjyoji-12, Kashiwa-shi, Chiba Hiritsu Co., Ltd. In Home Tech

Claims (1)

[Claims] 1. An object to be heated (5) is placed on a saucer (4) made of a dielectric material, and the saucer (4) is fixed by a turntable (6) made of a metal disk having mesh-like slits (6d). In a high frequency heating device which is rotatably supported, an arcuate slot (6a) having a radius of about ½ of a working wavelength λ along the circumferential direction of different radii (R1) and (R2) of a turntable (6).
A high-frequency heating device having a plurality of (6b) perforated.