JPS6259434B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for improving radio wave distribution within a heating chamber of a high-frequency heating device and to effective use of space within the heating chamber.

Conventional structure and its problems Conventionally, there has been a turntable method in which the food table is rotated as a method for uniformizing the radio wave distribution in the heating chamber of a high-frequency heating device, but the drawback of this method is that the food cannot be placed all over the heating chamber. When the food is placed in the oven, there is a problem that the food hits the wall of the heating chamber and the food table stops rotating.Especially in the case of an oven with a rectangular bottom shape of the heating chamber, the diameter of the food table should be adjusted to the dimension of the short side. This caused a problem in that a large amount of space was left on the long side.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
The purpose is to effectively utilize the space in a heating chamber and to perform uniform cooking by switching between a turntable system and a rotating antenna system with a simple configuration.

Structure of the Invention In order to achieve the above object, the present invention includes a heating chamber, a food placing stand for placing food in the heating chamber, a high frequency oscillator that supplies high frequency waves into the heating chamber, and oscillation by the high frequency oscillator. and an antenna that couples the heating chamber and the transmission means at approximately the center of the bottom wall of the heating chamber, and the antenna and the food table rotate about the same rotation axis. It is connected to a drive source and transmits the rotation of the rotary drive source to either the antenna or the food table, and can be used with either a turntable method or a rotary antenna method, so even large foods can be placed on the heating chamber wall. When cooking cannot be done with a turntable due to a problem, cooking can be done with a rotating antenna, which has the effect of eliminating dead space in the heating chamber and increasing the effective heating area.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a main body, and a heating chamber 2 is provided inside. 3 is a door that can be opened and closed using the front opening of the heating chamber as a fulcrum on one side. Radio waves oscillated by a high frequency oscillator (not shown) are transmitted through a waveguide 4 and radiated into the heating chamber from an antenna unit 5 provided approximately at the center of the bottom wall of the heating chamber. The antenna unit 5 consists of a vertical part 6 that is perpendicular to the bottom wall of the heating chamber and a horizontal part 7 that is horizontal. The radio waves are adjusted so that they become stronger as you get closer to the end of the track. Numeral 8 is a sealing plate for sealing the opening in the bottom wall of the heating chamber through which the vertical portion 6 of the antenna passes, and also functions as a bearing for pivotally supporting the vertical portion 6 of the antenna. A problem with radio wave co-generation using a rotating antenna is that the amount of radio waves radiated from the tip of the vertical part 6 of the antenna in the heating chamber is too large. In order to increase the amount of radio wave radiation from the tip of the antenna, the area around the vertical part 6 of the antenna on the bottom wall of the heating chamber is narrowed toward the inside of the heating chamber.
As a result, the amount of the vertical portion 6 of the antenna that extends into the heating chamber can be kept small, and the distance between the antenna and the bottom wall of the heating chamber at the tip of the horizontal portion 7 of the antenna can be increased. Reference numeral 9 denotes a rotating shaft made of a dielectric material provided coaxially with the vertical portion 6 of the antenna, and connected to a motor (not shown) via a pulley 10 and a belt 11 outside the waveguide. Since the rotating shaft 9 is always lifted upward by the spring 12, its tip inside the heating chamber is replaced with a food mounting table 13 having a circular planar shape.
Rotate this. As is clear from FIG. 2, the rotating shaft 9 only transmits rotational torque to the food table 13, and the weight of the food table 13 and the food is supported by the rollers 14. 15
1 is a bearing of the rotating shaft 9 made of a dielectric material fixed to the antenna unit, and 16 is the other bearing of the rotating shaft 9, and at the same time serves as a bearing of the vertical portion 6 of the rotating antenna in the thrust direction. FIG. 3 shows an embodiment in which the roller 14 is removed and replaced with a large fixed food table. In this case, the food table 13' has a rectangular or square planar shape and is supported at its ends by the bottom wall of the heating chamber. Therefore, the height of the food table is lower than that of the embodiment shown in FIG. 2, which pushes the rotating shaft 9 downward, and the small protrusion 17 provided on the rotating shaft forms a bearing integrated with the rotating antenna. 15 into the groove 18. Therefore, in this state, the antenna unit 5 is rotated by the rotation of the rotating shaft 9, and the contact portion between the food placing table 13' and the rotating shaft 9 is a point contact so that the mass is small.

Hereinafter, the effects of the above configuration will be explained. A food mounting table 13 with a circular plane and a roller 1
When the antenna unit 4 is in use, the rotating shaft 9 is connected to the food table 13, so the antenna unit 5
does not rotate, so the radio wave radiation source is fixed, but the food itself rotates as the food table 13 rotates, so the food can be heated uniformly.
If the food to be heated is too large and cannot be rotated because it touches the wall of the heating chamber, replace the food table and remove the rollers so that the rotating shaft 9 can be connected to the antenna unit 5. Although the table 13' does not rotate, the antenna itself, which is the radiation source of radio waves, rotates, so even large foods can be heated evenly.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) The rotating shaft is structured so that it can be easily switched and connected to either the antenna or the food table, so cooking can be done using either the rotating antenna method or the turntable method. Depending on the amount, you can heat and cook in the most suitable way.

(2) Although it basically has the structure of a turntable, if the food is too large to be cooked on a turntable, it can be cooked with a rotating antenna, so while taking advantage of the characteristics of a turntable, the effective volume in the heating chamber is reduced. It can solve the biggest drawback of turntables.

(3) Since the power is supplied downward, the distance between the food and the radio wave radiation source is small, and a high proportion of the radiated power is directly absorbed by the food, resulting in good heating efficiency.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a high-frequency heating device representing an embodiment of the present invention, Fig. 2 is a sectional view of the same main part when a turntable is used, and Fig. 3 is a sectional view of the main part when the rotary antenna is used. be. 1...Main body, 2...Heating chamber, 4...Waveguide, 5
... Antenna unit, 8 ... Sealing plate, 9 ... Rotating shaft, 13, 13' ... Food mounting table, 15 ... Bearing, 17 ... Small protrusion.

Claims (1)

[Scope of Claims] 1. A heating chamber for storing food, a food placing table for placing food in the heating chamber, a high-frequency oscillator for supplying high-frequency waves into the heating chamber, and a high-frequency oscillator for generating high-frequency waves oscillated by the high-frequency oscillator. It has a transmission means for transmitting high frequency waves, and an antenna that connects the heating chamber and the transmission means at approximately the center of the bottom wall of the heating chamber, and the antenna and the food table are rotated by a rotation drive source on the same rotation axis. A high-frequency heating device configured to be connected to and transmit rotation of the rotational drive source to either the antenna or the food mounting table. 2. The high-frequency heating device according to claim 1, wherein a small protrusion is provided at the tip of the rotating shaft.