JPS63279596A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To make a heating effect sufficiently securable by installing a magnetron and an output antenna part in one side, and installing an antenna, arranging a T-shaped slot spirally from the output antenna part side and a storage space housing material both in the oven that installed the output antenna part. CONSTITUTION:A magnetron 11 and an output antenna part 12 are installed in the upper part of an oven 10, while antenna 14 provided with a slot 13, a material storage space 15 and a dielectric plate 16 are installed in a lower part of the output antenna part 12, and a reflector 17 consisting of a concave mirror is installed in the lowermost part. This antenna 14 is one that is made up of arranging the T-shaped slot 13 spirally. The high frequency oscillated from the output antenna part 12 comes to a circularly polarized wave at a stage to be irradiated to material, whereby it can irradiate this material uniformly even without using a device for rotating the irradiated material and so on. With this constitution, efficient heating is made attainable.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a high-frequency heating device for heating foods and the like using high-frequency waves.

<Prior art> Foods, bacteria, and other substances that are heated or heated are
It is composed of molecules, and generally has a positive potential paired with a negative electron bound nearby.

Microscopically, it is a collection of positive and negative dipoles, but the electric field as a whole is close to zero.

Heating devices such as conventional microwave ovens that heat substances such as foods use TEM waves (Transverse E) emitted from the output antenna of a magnetron.
(electromagnetic Waves) were irradiated onto the article as linearly polarized waves using a waveguide and a reflector.

For this reason, only the dipoles of the molecules in the material that are parallel to the linearly polarized electric field absorb the energy of the external electric field, resulting in non-uniform heat generation in which only the part of the molecules in a specific direction in the material generates heat. Met.

On the other hand, most of the molecular dipoles located perpendicular to the linearly polarized electric field did not respond to the incident microwaves at all, and a uniform heating effect could not be obtained.

In addition, the dipoles of molecules parallel to the linearly polarized wave become overheated, causing problems such as deterioration of taste in the case of foods and deformation and rupture of the packaging in the case of packaged foods.

Furthermore, in order to uniformly heat the article using linearly polarized waves in the heating device, the linearly polarized waves may be diffusely reflected by a stirrer 1 as shown in FIG.
Vibration, etc. was necessary.

As shown in FIG. 4, even in a continuous microwave heating device that continuously moves a substance on a belt conveyor 3 and irradiates it with microwaves, linearly polarized waves using rectangular waveguides are used. By the time the microwave reaches the material from the magnetron.

The actual situation was that losses occurred at the flange portion, some corners, etc., resulting in poor energy efficiency, and a satisfactory heating effect was not obtained with respect to the amount of electricity used.

Problems to be solved> As described above, all conventional microwave heating devices use linearly polarized waves as microwaves.

Not only was it not possible to use energy effectively, but food and other substances were also overheated, causing accidents such as deterioration of taste and rupture of packaging.

Accordingly, one object of the present invention is to provide a high-frequency heating device capable of efficient heating by using circularly polarized waves instead of linearly polarized waves.

Means for Solving the Problem> An antenna in which a magnetron and an output antenna part are provided on one side, and T-shaped slots are arranged in a spiral shape from the output antenna part side in the oven in which the output antenna part is provided; The problem was solved by providing a storage section to store the substance.

Furthermore, if a concave reflector is provided on the opposite side of the output antenna section, high frequencies can be used more effectively.

Function: The high frequency waves oscillated from the output antenna section are transmitted through an antenna with a spiral T-shaped slot.

By irradiating circularly polarized waves, it was possible to excite substances such as foods in all directions.

Even without a rotating device for uniform irradiation, it is possible to uniformly irradiate high-frequency waves onto articles.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

At the top of the oven 10 is a magnetron 11. The output antenna section 12 is placed in a slot 1° below the output antenna section 12.
Antenna with 3 14. Material storage section 15. Dielectric plate 16. This is a high-frequency heating device in which a reflecting mirror 17 made of a concave mirror is provided at the bottom.

As shown in FIG. 2, this antenna 14 is formed by arranging T-shaped slots 13 in a spiral shape.

Here, one reflecting mirror 17 is not necessarily necessary, but it is preferable because it can effectively utilize high frequencies. It is preferable to set the height of the substance storage section 15 to % of the wavelength, which is excellent in terms of heating efficiency.

Further, in the apparatus shown in FIG. 1, the output antenna section 12 is located at the upper part 9 and the reflecting mirror 17 is located at the lower part.

In addition, the output antenna part 12 and the lower part 1 reflecting mirror 17 may be located at the upper part.

Instead of arranging the output antenna part and reflector vertically,
Alternatively, they may be provided on both the front and rear sides.

In any of the above cases, the antenna and substance storage section.

The dielectric plates are provided in this order in the same positional relationship as in FIG.

It is preferable that the shape of the antenna, substance storage part, and dielectric plate used in the heating device of the present invention is a circular shape, but even if the shape is a polygon such as a square, electromagnetic wave absorbers such as ferrite may be provided at the corners. It can be put into practical use.

Effects> In the device of the present invention, the high frequency waves oscillated from the output antenna section become circularly polarized waves at the stage of irradiating the material, and the waves can be uniformly polarized without using any means such as rotating the material to be irradiated. It can be irradiated.

Further, since it is not necessary to provide two or more rotating mechanisms, the device is simplified and failures are reduced.

Furthermore, since circularly polarized waves were used for heating the material.

Since uniform heating is possible without overheating the substance as in the conventional method, if the substance is food, the taste is reduced.

It is possible to maintain a state with little change in color.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention. Figure 2 is a plan view of the antenna used in Figure 1, Figure 3,
FIG. 4 is an explanatory diagram showing the structure of a conventional heating device. 10... Oven 11... Magnetron 12... Output antenna section 13... Slot 14
...Antenna 15...Matter storage section 16.
...Dielectric plate 17...Reflector patent
Applicant: Toppan Printing Co., Ltd. Representative: Kazuo Suzuki Figure 1 Figure 2

Claims (1)

[Claims] (1) A magnetron and an output antenna part are provided on one side, and an antenna with a T-shaped slot spirally arranged from the output antenna part side in the oven provided with the output antenna part, and a storage part for storing substances. High frequency heating device equipped with.