JP2944224B2 - Microwave 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 microwave heating device such as a microwave oven which guides microwaves through a waveguide and supplies the microwaves from a power supply port into a heating chamber.

[0002]

2. Description of the Related Art In a microwave oven in which microwaves are supplied from a power supply port into a heating chamber and the power supply port is formed on a side wall of the heating chamber (see Japanese Patent Publication No. 64-9718), the power supply port is Generally, the heating chamber is located at a position deviated from the center line of the side wall of the heating chamber. In this case, the heating at the center of the heating chamber tends to be weak.

In order to strengthen the heating in the center of the heating chamber, a microwave reflector is appropriately provided so as to protrude into the heating chamber, and the microwave may be directed to the center of the heating chamber. By providing the reflector in the heating chamber, the effective volume in the heating chamber is reduced, and there is a risk of injury because the reflector can be easily touched.

[0004]

SUMMARY OF THE INVENTION According to the present invention, in a configuration in which a power supply port is displaced from a center line of a side wall of a heating chamber, the effective volume of the heating chamber is not reduced and the danger of injury is not caused. It is an object of the present invention to provide a microwave heating device capable of increasing heating at a central portion.

[0005]

A microwave heating apparatus according to the present invention comprises a heating chamber, microwave generating means, a waveguide for guiding the microwave generated by the microwave generating means, and a side wall of the heating chamber. A power supply port that is located at a position deviated from the center line of the side wall and supplies the microwave guided by the waveguide into the heating chamber; and a power supply port on the center line side of the power supply port, and And a cover that covers a corner far from the microwave generating means in a right-angled triangle shape.

Further, the size of the cover is determined so that the length of two sides sandwiching the right angle portion of the right triangle is λ / 4 (λ is the wavelength of the microwave) or more.

[0007]

According to the present invention, the corner of the power supply port on the side of the center line and on the side far from the microwave generating means is covered with a right triangular shape.
As can be seen from the experimental results described later, the heating at the central portion of the heating chamber becomes stronger.

Further, this is remarkable when the length of two sides sandwiching the right angle portion of the right triangle is λ / 4 or more.

[0009]

1 to 3 show a microwave oven according to an embodiment of the present invention. A heating chamber 2 containing a turntable 1 on which food is placed and rotated is provided. In the right side wall 3 of the heating chamber, the heating chamber 2 does not reach the center line 4 passing through the center of the side wall but deviates rearward from the center line 4. Here, a power supply port 5 is formed.
A magnetron 6 for generating microwaves is connected to the power supply port 5 via a waveguide 7. When the microwave is generated from the magnetron 6, it is guided by the waveguide 7 and supplied from the power supply port 5 into the heating chamber 2 to heat the food on the turntable 1. The power supply port 5 has a horizontally long rectangular shape of 80 mm × 40 mm.

The upper right corner of the power supply port 5 on the side closer to the center line 4 and farther from the magnetron 6 (upper side) is covered by a metal cover 8 in a right-angled triangular shape. In this case, the size of the cover 8 is preferably determined such that the lengths a and b of two sides sandwiching the right-angled portion of the right triangle are λ / 4 (λ is the wavelength of the microwave) or more. You. The power supply port 5 is closed with a microwave transparent cover 9.

Table 1 shows experimentally the heating intensity at the center of the heating chamber on the turntable 1 when the power supply port 5 is covered with the cover 8 in a triangular shape and in other cases. , And summarizes the results. To explain how to determine the heating intensity at the center of the heating chamber, prepare five beakers (capacity: 300 cc) containing 240 cc of water at a temperature of 20 ° C., place one in the center of the turntable 1 and the other four Are placed at equal intervals around the perimeter and operated for 2 minutes at a microwave output of 700 W. The temperature rise of water in each beaker from 20 ° C. due to this operation is detected, and from these temperature rise values,

[0012]

(Equation 1)

According to the following equation, the intensity of heating to the periphery of the central portion of the heating chamber was determined. The larger the value thus obtained is on the + side, the stronger the heating at the center of the heating chamber.

[0014]

[Table 1]

In Table 1, No. Reference numeral 1 indicates an experimental result when the power supply port is not covered with the cover. No. 2 is a right upper corner of the power supply port, a is b, λ · 5/12, λ · 1/4
The experimental results are shown in the case of covering a right triangle with a cover such that No. 3 is a, b at the upper right corner of the power supply port
Shows the results of an experiment in the case of covering with a covering body in a right-angled triangle such that becomes λ ・ and λ ・. No. Reference numeral 4 denotes an experimental result when the upper side of the power supply port is covered with a cover over a width of 10 mm in a horizontally long rectangular shape. No. Reference numeral 5 denotes an experimental result when the right side of the power supply port is covered with a cover over a width of 10 mm in a vertically long rectangular shape.

From the above Table 1, the No. 2 and No. It can be seen that when the upper right corner of the power supply port is covered in a triangular shape with a cover as in 3, heating at the center of the heating chamber becomes stronger.
Furthermore, No. 2 is better when the upper right corner of the power supply port is covered with a cover so that a and b are λ ・ 5/12 and λ ・ と も に, and both are λ / 4 or more. It turns out that a result is obtained.

[0017]

According to the present invention, in a configuration in which the power supply port is deviated from the center line of the side wall of the heating chamber, the heating at the center of the heating chamber can be strengthened. For example, the center is strongly heated like a cake. It is possible to provide a microwave heating device which is convenient for cooking which is preferably performed.

Further, intensifying the heating of the central portion of the heating chamber as described above can be achieved only by covering the corner on the center line side of the power supply port and on the side far from the microwave generating means in a right triangle shape. It is not necessary to protrude the microwave reflecting plate into the heating chamber as in the related art, so that the effective volume of the heating chamber can be prevented from being reduced, and the risk of injury can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a microwave oven according to an embodiment of the present invention, with a microwave permeable cover removed.

FIG. 2 is an external perspective view of a microwave oven according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 2 Heating chamber 5 Power supply port 6 Magnetron 7 Waveguide 8 Cover

Claims (2)

(57) [Claims] 1. A heating chamber, microwave generating means, a waveguide for guiding microwaves generated by the microwave generating means, and a part formed on a side wall of the heating chamber and deviating from a center line of the side wall. And a power supply port for supplying the microwave guided by the waveguide to the heating chamber, and a corner of the power supply port on the center line side and far from the microwave generation means, A microwave heating device comprising a cover covering a right triangle. 2. The size of the cover according to claim 1, wherein a length of two sides sandwiching a right angle portion of the right triangle is λ / 4 (λ is a wavelength of a microwave) or more. Microwave heating device.