JPS6243314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device that can obtain excellent distribution characteristics of high-frequency waves supplied into a heating chamber.

Conventionally, in order to uniformly irradiate high-frequency waves onto the heated object housed in the heating chamber of a high-frequency heating device, there is a turntable-type device that rotates the mounting table for the heated object. Since the radiation is emitted from the top, the distance from the high-frequency radiation source to the object to be heated is long, and therefore, before the high-frequency radiation is absorbed by the object to be heated, it is repeatedly reflected on the walls of the heating chamber and is attenuated to some extent. Since it is then absorbed by the object to be heated, heating efficiency deteriorates.

Furthermore, the high frequency distribution characteristics at the center of the heating chamber, that is, the center of the turntable are relatively poor, resulting in uneven heating.

In addition, in order to improve the distribution characteristics of the high frequency waves supplied to the heating chamber, there is also a stirrer type that has a rotating antenna installed on the upper wall of the heating chamber. Different concavities and convexities must be provided to improve the characteristics, which has the disadvantage that the heating chamber cannot be shared.

The present invention solves the above-mentioned conventional drawbacks, and has good distribution characteristics of the high frequency waves supplied into the heating chamber, and even when the size of the heating chamber changes or a rotating food table is not used, the heating chamber can be easily distributed. The purpose is to enable common use of basic designs.

In order to achieve the above object, the present invention provides a heating chamber that houses an object to be heated, a high frequency oscillator that supplies high frequency waves into the heating chamber, a waveguide that guides the high frequency waves oscillated by the high frequency oscillator to the heating chamber, and a waveguide that guides the high frequency waves generated by the high frequency oscillator to the heating chamber. A food mounting table made of a dielectric material is provided at the tip of the dipole antenna, and the dipole antenna is configured to rotate. Since high frequency waves are directly radiated from the dipole antenna, the object to be heated can be dielectrically heated efficiently with strong high frequency waves, and when the food table is not in use, a horizontal component antenna can be installed at the end of the dipole antenna. This has the effect that even if the size of the heating chamber changes, the basic structure can be shared without changing the design.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Fig. 1, 1 is the main body of the high-frequency heating device;
A door 3 is provided at the opening of a heating chamber 2 provided within the main body 1 so as to be openable and closable. 4 is a high frequency oscillator, and the high frequency waves oscillated by this high frequency oscillator 4 are radiated into the heating chamber 2 via a waveguide 5 from a dipole antenna 6 rotatably provided at the bottom of the heating chamber. Reference numeral 7 denotes a food mounting table detachably provided at the end of the dipole antenna 6 facing into the heating chamber 2, and is made of a dielectric material. The end of the dipole antenna 6 to which this food placement table 7 is attached is designed to have a diameter of at least 1/4 of the radio wave used to prevent the food placement table 7 from melting due to the concentration of electric fields in localized areas. And make it bigger than other parts. Furthermore, by making the diameter of the end portion of the dipole antenna 6 larger than that of the other portion, the mechanical attachment of the dipole antenna 6 and the food table 7 can be made more stable. Reference numeral 8 denotes a rotational drive shaft of the dipole antenna 6, and this rotational drive shaft 8 is made of a dielectric material. 9 is the waveguide 5
A pulley is provided on a rotary drive shaft 8 passing through the pulley, and is rotationally driven by a motor 11 via a belt 10. A plurality of rollers 12 are provided at the bottom of the pulley 9 so that the pulley 9 receives loads from the dipole antenna 6 and the food table 7 in the thrust direction. A sealing plate 13 seals a coupling port with the dipole antenna 6 provided at the bottom of the heating chamber, and is made of a dielectric material and also serves as a rotation bearing for the dipole antenna 6. 14, 15, 16
is a plurality of reflective surfaces provided on the bottom wall of the heating chamber concentrically around the dipole antenna 6, which reflects the high frequency waves radiated from the dipole antenna 6 mainly in the horizontal direction, and This is for efficiently absorbing it into the heated object.

A plurality of reflective surfaces 1 provided on the bottom wall of the heating chamber
4, 15, and 16, the radio waves can be efficiently reflected on the entire food table 7, and the object to be heated can be dielectrically heated more uniformly.

In FIG. 2, a food table 17 is fixed instead of the rotating food table 7 of FIG. 1, and a horizontal component 18 is provided at the end of the dipole antenna 6.

With this configuration, the object to be heated can be placed on the food table 17 and the high frequency waves can be uniformly radiated into the heating chamber 2 from the horizontal component 18 of the rotating dipole antenna 6.

By configuring the high frequency heating device in this way, the basic structure of all the other components except for the horizontal component 18 provided on the food mounting tables 7 and 17 and the dipole antenna 6 can be standardized and shared. In addition to reducing costs, the food table 7 can be installed on the rotating dipole antenna 6 or the horizontal component 1 can be installed in accordance with market demands.
8 can be provided.

In addition, since the food placing table 7 is attached to the top of the rotating dipole antenna 6, it is easy to strengthen the high frequency distribution in the center of the food placing table 7, and the bottom wall of the heating chamber around the dipole antenna 6 can be easily strengthened. Multiple concentric reflective surfaces 14, 15, 1
6, it is possible to obtain a more uniform high frequency distribution in the diametrical direction of the food placing table 7, thereby preventing uneven heating of the object to be heated.

Furthermore, the diameter of the end of the dipole antenna 6 is set to 1/4 or more of the wavelength used, which is larger than the other parts, so that the electric field concentrated at the end of the dipole antenna 6 prevents the food table 7 from melting. is prevented, and the dipole antenna 6 and food table 7
The mounting strength can be increased.

Furthermore, the dipole antenna 6 that radiates high frequency waves into the heating chamber 2 also serves as a rotational drive shaft for the food table 7, so it can be manufactured with a simple structure and at low cost.

The high frequency waves supplied into the further heating chamber 2 are radiated from the dipole antenna 6 provided at the bottom of the heating chamber, so there is no need to provide an opening on the top wall of the heating chamber through which the high frequency waves are radiated, and there is no need to provide a food mounting table. 7 and the dipole antenna 6 are detachably provided, the high frequency heating device becomes easy to clean inside the heating chamber 2 by removing the food placing table 7.

As is clear from the above description, the high frequency heating device of the present invention provides the following effects.

1. By attaching and detaching the food table at the end of the rotating dipole antenna and bringing the distance between the object to be heated and the high-frequency radiation source close, the object to be heated can be dielectrically heated uniformly and efficiently using strong high-frequency waves. can.

2 The structure of all other components except for the horizontal component of the food table and dipole antenna are standardized.
In addition to allowing common use, it is also possible to install a food table on a rotating dipole antenna, or to install a fixed food table in the heating chamber and provide a horizontal component on the dipole antenna, depending on market demands. , a significant cost reduction can be achieved.

3. The high-frequency waves supplied into the heating chamber are radiated from the Typole antenna rotatably installed at the bottom of the heating chamber, so there is no need to provide an opening on the top wall of the heating chamber through which the high-frequency waves are radiated, and the food By providing the food table and the dipole antenna in a detachable manner, it is possible to provide a high-frequency heating device that is easy to clean by removing the food table.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a high-frequency heating device showing an embodiment of the present invention, and FIG. 2 is a side view showing a state in which a horizontal component is provided in place of the food mounting table shown in FIG. 1. 2... Heating chamber, 4... High frequency oscillator, 5... Waveguide, 6... Dipole antenna, 7... Food mounting table.

Claims (1)

[Scope of Claims] 1. A heating chamber that houses an object to be heated, a high-frequency oscillator that supplies high-frequency waves into the heating chamber, a waveguide that guides the high-frequency waves oscillated by the high-frequency oscillator to the heating chamber, and this waveguide. A high-frequency heating device comprising a dipole antenna that connects a tube and the heating chamber, a food mounting table made of a dielectric material being detachably attached to the tip of the dipole antenna, and configured to rotate the dipole antenna. 2. The high-frequency heating device according to claim 1, wherein the diameter of the tip of the dipole antenna provided with the food mounting table is 1/4 or more of the wavelength used. 3 On the bottom wall of the heating chamber around the dipole antenna,
The high frequency heating device according to claim 1, further comprising a plurality of concentric reflecting surfaces centered around a dipole antenna.