JPS584435B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a high-frequency heating device called a turntable type, and its purpose is to prevent uneven heating of foods.

A conventional general high-frequency heating device called a turntable type has a circular constriction portion 3 formed on the bottom plate 2 of a heating chamber 1, as shown in Fig. 1. A rotary table 5 and a circular saucer 6 are disposed within the constricted portion 3 of the shape, and the object to be heated 4 is heated while being rotated.

As shown in Fig. 2, when the object 7 to be heated is large, a rectangular saucer 8 is disposed on the bottom plate 2 to heat the object 7; 8
Since the corner portion of the rectangular tray 8 comes into contact with the bottom plate 1, the electric field strength at this portion becomes weak, and if the object to be heated 7 is placed eccentrically on this rectangular saucer 8, uneven heating may occur at the corner. Oops.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and includes forming a rectangular constricted portion on the bottom plate of the heating chamber, and also forming a circular constricted portion on the bottom plate portion within the rectangular constricted portion. The aim is to achieve the initial objective by

Hereinafter, the present invention will be explained with reference to FIGS. 3 and 4 showing one embodiment thereof.

In the figure, 9 is a main body case, 10 is a door, 11 is a handle, and 12 is a decorative board on which a time switch (not shown) and the like are attached.

Reference numeral 13 denotes a heating chamber formed in the main body case 9. Below the bottom plate 14 of the heating chamber 13, there is a first pulley 17 having a plurality of rollers 15 and magnets 16 disposed circumferentially on the upper surface. The first pulley 17 is rotatably supported by a blower motor 24 of a blower 23 via a first belt 18, a second pulley 19, a drive shaft 20, a worm gear 21, and a second belt 22. It has become.

By the way, a rectangular constriction section 25 is formed on the bottom plate 14 of the heating chamber 13, and this rectangular constriction section 25
A circular aperture portion 26 is formed in the inner bottom plate portion, resulting in a two-stage aperture structure.

As shown in FIG. 3, when the object to be heated 27 is small, a circular saucer 31 is placed on a disc-shaped rotary table 3,0 on which a plurality of rollers 28 and magnets 29 are arranged at the lower part of the periphery. ,
The object to be heated 27 is placed on this circular saucer 31.

Therefore, the magnet 29 of the rotary table 30 and the first pulley 17
An attractive force acts between the magnets 16. Therefore, when the first pulley 17 is rotationally driven by the blower motor 24, the rotary table 30 rotates, and as a result, the object to be heated 2
7 is heated while rotating.

When the object to be heated 32 is large as shown in FIG. The object to be heated 32 is placed on a saucer 33 and heated.

By the way, the bottom plate 14 of the heating chamber 13 has a rectangular diaphragm υ part 2.
5 is formed, and a rectangular saucer 33 and this rectangular saucer 33
The distance between this rectangular saucer 32 and the bottom plate 14 covered with
are almost equal over the entire surface.

Therefore, the electric field strength is equal over the entire surface of the rectangular tray 33, and even if the object to be heated 32 is eccentrically placed on the rectangular tray 33, no uneven heating will occur at the corners or the like.

Note that 35 is a top plate, 36 is a stirrer fan, and 37 is a high frequency oscillator.

As described above, in the high-frequency heating device of the present invention, a rectangular constriction part is formed on the metal bottom plate of the heating chamber, and a circular constriction part is further formed within this constriction part, so that the distribution due to reflection from the bottom plate is When the unevenness is eliminated and a rectangular saucer is placed on the bottom plate, the electric field strength becomes equal over the entire surface of the rectangular saucer, and as a result, even if the object to be heated is placed eccentrically on the rectangular saucer, its corner It is difficult for uneven heating to occur in certain areas.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the use of a conventional high-frequency heating device, FIG. 2 is a top sectional view of a main part showing another example of using the same device, and FIG. 3 is a cross-sectional view of an example of the present invention. FIG. 4 is a cross-sectional view showing one usage example of the high-frequency heating device, and FIG. 4 is a top sectional view of the main part showing another usage example of the same device. 9...Main case, 13...Heating chamber,
14... Heating chamber bottom plate A25... Rectangular aperture part 9, 26... Circular aperture part A27...
...Small heated object A30...Rotary table, 31.
...Circular saucer A32...Large object to be heated, 33...Rectangular saucer.

Claims (1)

[Claims] 1. On the metal bottom plate of the heating chamber formed inside the main body case,
A high-frequency heating device that forms a rectangular constriction part and forms a circular constriction part on the bottom plate inside the rectangular constriction part to form a two-stage constriction structure.