JP3133368B2 - High frequency heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device such as a microwave oven.

[0002]

2. Description of the Related Art FIG. 4 shows a microwave oven disclosed in Japanese Utility Model Publication No. 59-34073. Rotating antennas 21 and 22 are provided near the upper and lower centers in the heating chamber 20, and magnetrons 2 serving as high-frequency generating means are provided from the tips of these antennas.
The high-frequency waves generated by 3 and 24 are radiated into the heating chamber 20.

[0003] Such a configuration has a considerable effect in improving the uneven heating, but when looking at in detail, the high-frequency waves radiated from the rotary antennas 21 and 22 are directed toward the side wall of the heating chamber as indicated by arrows. Relatively strong. Therefore, the heating unevenness cannot be sufficiently improved.

[0004]

SUMMARY OF THE INVENTION The present invention aims to remarkably reduce uneven heating in a configuration in which high frequencies are radiated from above and below into a heating chamber.

[0005]

SUMMARY OF THE INVENTION A high-frequency heating apparatus according to the present invention.
A heating chamber, a dielectric turntable disposed at the bottom of the heating chamber and rotating food, a roller supporting the periphery of the turntable, a roller shaft and the roller shaft.
A metal-made ring body for connecting a metallic roller carrier for supporting the rollers, a high frequency generation unit, are placed on top of the heating chamber, emits a high frequency the high frequency generating means is generated in the heating chamber rotating antenna and the waveguide means for guiding the high frequency the high frequency generating means generates the lower side of the heating chamber, the metal a bottom wall of the heating chamber to
A high-frequency power supply , which is formed at the center of the heating chamber from the roller support and supplies the high- frequency wave guided by the waveguide means into the heating chamber.
It consists of a mouth .

[0006]

[0007]

[Function] The high frequency spreads evenly in the heating chamber.

[0008]

1 and 2 show the structure of a microwave oven according to a first embodiment of the present invention. 1 is a heating chamber, 2 is a turntable housing recess formed in a bottom wall 3 of the heating chamber 1, and 4 is a bottom portion in the heating chamber 1 which is disposed in the recess 2 and is a dielectric for rotating food. The body turntables 5, 5,... Are resin rollers for supporting the periphery of the lower surface of the turntable 4,
Reference numeral 6 denotes a roller support for supporting these rollers. The support comprises metal roller shafts 7, 7,... And a metal ring body 8 connecting these roller shafts. 9 is a motor for driving the turntable 4; 10, 11 are first and second magnetrons for generating high frequency; 12, 13 are first and second magnets for guiding the high frequency from these magnetrons to the upper and lower sides of the heating chamber 1. The second waveguide 14 is the heating chamber 1
A rotary antenna that is disposed near the upper center of the inside and radiates a high frequency from the first magnetron 10 guided by the first waveguide 12 into the heating chamber 1, and a rotating antenna 15 is a bottom wall 3 of the heating chamber 1.
A high-frequency supply port formed at the center of the heating chamber with respect to the support 6, that is, inside the support 6, for supplying the high-frequency wave guided by the second waveguide 13 into the heating chamber 1. The interval L between the reference numeral 15 and the turntable 4 is determined to be an odd multiple of approximately λ / 4, specifically λ / 4, where λ is a high-frequency wavelength.

In such a configuration, the high frequency radiated from the rotating antenna 14 is relatively strong toward the side wall of the heating chamber as shown by the arrow A, but the high frequency radiated from the supply port 15 is shown by the arrow B. The direction toward the vicinity of the center of the heating chamber is relatively strong, so that the high frequency spreads uniformly throughout the heating chamber 1 and the unevenness in heating of the food is remarkably improved. Furthermore, the high frequency wave from the supply port 15 is located inside the support body 6 including the metal roller shafts 7, 7,... And the ring body 8 and near the center of the heating chamber without being disturbed by the support body. Oppositely, efficient heating of the food on the turntable is achieved. Moreover, since the turntable 4 is located at a position of λ / 4 with respect to the supply port 15, the food on the turntable is exposed to a high frequency having a strong electric field strength, and more efficient heating is performed.

FIG. 3 shows the structure of a microwave oven according to a second embodiment of the present invention. The same portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only different portions will be described.
A high-frequency supply port 15 for radiating the high-frequency wave guided by the second waveguide 13 into the heating chamber 1 is formed on the inclined side wall 16 of the recess 2, and the supply port 15 is closed by a resin lid 17. ing.

In this case, the high frequency radiated from the rotating antenna 14 is relatively strong toward the side wall of the heating chamber as indicated by an arrow a, and the high frequency radiated from the supply port 15 is efficiently located near the center of the heating chamber as indicated by an arrow b. This is relatively strong, and thus, similarly, the high frequency spreads evenly throughout the heating chamber 1 and the uneven heating of the food is remarkably improved. Further, since the supply port 15 is provided on the side wall 16, even if food is spilled in the heating chamber 1, it hardly leaks from the supply port 15 to the outside.

[0012]

According to the present invention, in a configuration in which high frequencies are radiated into the heating chamber from above and below, the high frequencies can be uniformly spread in the heating chamber, and the uneven heating can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a microwave oven according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view of the microwave oven with a turntable removed.

FIG. 3 is a front sectional view of a microwave oven according to a second embodiment of the present invention.

FIG. 4 is a front sectional view of a conventional microwave oven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Turntable accommodating recess 4 Turntable 5 Roller 6 Roller support 10 1st magnetron 11 2nd magnetron 12 1st waveguide 13 2nd waveguide 14 Rotating antenna 15 High frequency supply port

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-160395 (JP, A) JP-A 1-129793 (JP, U) JP-A 62-31897 (JP, U) JP-A 56-318 64698 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 6/70-6/74

Claims (1)

(57) [Claims] 1. A heating chamber, a dielectric turntable disposed at the bottom of the heating chamber for rotating food, a roller supporting the periphery of the turntable, a roller shaft, and a roller shaft.
A metal roller body for connecting the roller shafts, a metal roller support for supporting the rollers, a high-frequency generating means, and a high-frequency generating means disposed at an upper portion in the heating chamber. A rotating antenna for radiating the generated high-frequency waves into the heating chamber; a waveguide unit for guiding the high-frequency waves generated by the high-frequency generation means to a lower side of the heating chamber; and a bottom wall of the heating chamber and supporting the metal roller. A high-frequency heating device formed at a center side of the heating chamber from the body and configured to supply a high- frequency wave guided by the waveguide means to the heating chamber;