JPH04242097A - Microwave heating device - Google Patents

Abstract

PURPOSE:To outstandingly restrain microwaves from leaking outside from the front opening of a heating chamber in a microwave oven. CONSTITUTION:A microwave choke section 10 provided for a door is formed in a G-shape in cross section, the choke section 10 is formed with plural slits 12, 12,... which are mutually spaced at intervals, and furthermore, each choke partitioning wall 13 located within the microwave choke section 10 is tilted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to microwave heating devices such as microwave ovens.

0002

[Prior Art] Japanese Patent Application Laid-Open No. 59-177893 states
In order to suppress microwave leakage from the heating chamber, a configuration has been disclosed in which the microwave choke part has a G-shaped cross section and a plurality of slits are formed at intervals in the microwave choke part, but this is still insufficient. Microwave leakage effect cannot be obtained.

0003

SUMMARY OF THE INVENTION The present invention makes it possible to significantly suppress microwave leakage and to easily manufacture a microwave choke section for suppressing microwave leakage.

0004

[Means for Solving the Problems] The present invention includes a heating chamber for storing an object to be heated, a microwave supply means for supplying microwaves into the heating chamber, and a door for opening and closing the opening of the heating chamber. In the microwave heating device, a microwave choke portion having a G-shaped cross section is formed on either one of the opening surrounding wall located around the opening and the portion of the door opposite to the opening surrounding wall, and the microwave choke portion has a G-shaped cross section. The present invention is characterized in that a plurality of slits are formed at intervals in the wave choke part, and a choke partition wall located in the microwave choke part is inclined.

[0005] Furthermore, the above method for manufacturing a microwave choke part includes the step of preparing a metal plate for manufacturing the microwave choke part, and forming a groove inward by a V-press at a predetermined distance from the peripheral edge of the metal plate. , centering on the inside of the groove and bending the outside from this center by approximately 90 degrees;
It is characterized by comprising a step of bending by an angle of less than 0°, and a step of bending the groove outwardly from the groove by approximately 90° after this step.

[0006]

[Function] The microwave choke part has a G-shaped cross section, a plurality of slits are formed at intervals in the microwave choke part, and the choke partition wall located inside the microwave choke part is inclined. Wave leakage is sufficiently suppressed.

Furthermore, the choke part is easily manufactured.

[0008]

Embodiment FIGS. 1 to 3 show the structure of a microwave oven according to an embodiment of the present invention, in which a heating chamber 3 having a front opening 2 and containing food is formed in a microwave oven main body 1. A keyboard 4 and a door 5 for opening and closing the front opening 2 are provided on the front surface of the main body 1. The food is then heated by microwaves supplied from the magnetron 6 into the heating chamber 3.

The door 5 is mainly composed of a door body 7, and the door body 7 is composed of a heating chamber viewing window 8, a contact portion 9, and a microwave choke portion 10. The viewing window 8 is made up of a large number of punched holes that do not transmit microwaves. The contact portion 9 contacts or almost contacts the opening surrounding wall 11 located around the opening 2 when the door is closed. The microwave choke part 10 is formed at a location facing the opening surrounding wall 11 of the door 5, has a G-shaped cross section, and has a plurality of slits spaced apart from each other in the direction around the door (direction of arrow A in FIG. 1). 12, 12, . . . are formed periodically. The choke partition wall 13 located within the microwave choke section 10 is inclined toward the center of the door. The angle of inclination is 16°, and the dimensions of each part of the door are as shown in FIGS. 1 and 2.

The results of various experiments conducted using the above structure will be explained below. In FIG. 4, a solid line a indicates a distance between the latch side of the door 5 and the opening surrounding wall 11 while separating the hinge side of the door 5 by 0.6 mm from the opening surrounding wall 11 when the choke partition wall 13 is inclined. The graph shows the results of measuring the maximum amount of microwave leakage from the opening 2 when the gap G1 is changed (FIG. 5), and the broken line b indicates the state where the choke partition wall 13 is not inclined (the position of the broken line in FIG. 2). Similar measurement results are shown.

In FIG. 6, a solid line a indicates the case where the parallel gap G2 between the door 5 and the opening surrounding wall 11 is changed (FIG. 7) with the choke partition wall 13 in an inclined state.
The figure shows the result of measuring the maximum amount of microwave leakage from the opening 2, and the broken line b shows the same measurement result when the choke partition wall 13 is not tilted.

In FIG. 8, a solid line a indicates that when the choke partition wall 13 is inclined, the latch side of the door 5 is brought into close contact with the opening surrounding wall, while the gap G3 between the hinge side and the opening surrounding wall 11 is closed. Aperture 2 when changed (Figure 9)
The broken line b shows a similar measurement result when the choke partition wall 13 is not tilted.

In FIG. 10, a solid line a indicates that when the choke partition wall 13 is inclined, the hinge side of the door 5 is brought into close contact with the opening surrounding wall, while the gap G4 between the latch side and the opening surrounding wall 11 is closed. It shows the results of measuring the maximum value of the amount of microwave leakage from the opening 2 when the angle is changed (FIG. 11), and the broken line b shows the same measurement results when the choke partition wall 13 is not tilted.

As can be seen from these FIGS. 4, 6, 8, and 10, the microwave choke section 10 has a G-shaped cross section, and a plurality of slits 12, 12, . . . are formed at intervals in this microwave choke section 10. At the same time, the choke partition wall 1 located within this microwave choke section 10
In the configuration in which the angle 3 is inclined, sufficient microwave leakage can be suppressed.

A method of manufacturing the microwave choke section 10 will now be described with reference to FIGS. 12 to 16. First, a metal flat plate is prepared, after which the heating chamber viewing window 8 and the contact part 9 are bent and formed, and the peripheral part 14 is cut to the required size (Fig. 1
2), V-press a groove 16 a predetermined distance inward from the circumferential edge 15 (FIG. 13), and bend the outside by approximately 90° from the central portion 17, centering on the inside of this groove 16 (FIG. 14). ), and then, centering on the outside of the groove 16, bend the outside from this center part 18 by 74 degrees, and finally, centering on the groove 16, bend the outside from this groove 16 by approximately 90 degrees. The bending in this final step is facilitated by the presence of the groove 16.

[0016]

According to the present invention, in the microwave heating device, the microwave choke portion has a G-shaped cross section, a plurality of slits are formed at intervals in the microwave choke portion, and the microwave choke portion has a G-shaped cross section. By slanting the choke partition wall located inside the heating chamber, leakage of microwaves from the opening of the heating chamber to the outside can be significantly suppressed.

Furthermore, the choke portion can be manufactured easily.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of a microwave oven according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a microwave oven according to an embodiment of the present invention.

FIG. 3 is an external perspective view of a microwave oven according to an embodiment of the present invention.

FIG. 4 is a diagram showing measurement results of microwave leakage amount in an example of the present invention.

FIG. 5 is a plan view of essential parts of a configuration for obtaining the measurement results of FIG. 4;

FIG. 6 is a diagram showing other measurement results of the amount of microwave leakage in the example of the present invention.

7 is a plan view of essential parts of a configuration for obtaining the measurement results of FIG. 6; FIG.

FIG. 8 is a diagram showing still another measurement result of the amount of microwave leakage in the example of the present invention.

9 is a plan view of essential parts of a configuration for obtaining the measurement results of FIG. 8; FIG.

FIG. 10 is a diagram showing still another measurement result of the amount of microwave leakage in the example of the present invention.

FIG. 11 is a plan view of a main part of a configuration for obtaining the measurement results of FIG. 10;

FIG. 12 is a sectional view of a main part of a manufacturing process in an embodiment of the present invention.

FIG. 13 is a sectional view of a main part of another manufacturing process in an embodiment of the present invention.

FIG. 14 is a sectional view of a main part of still another manufacturing process in the embodiment of the present invention.

FIG. 15 is a sectional view of a main part of still another manufacturing process in the embodiment of the present invention.

FIG. 16 is a sectional view of a main part of still another manufacturing process in an embodiment of the present invention.

[Explanation of symbols]

2 Front opening 3 Heating chamber 5 Door 6 Magnetron 10 Microwave choke part 11 Opening surrounding wall 12 Slit 13 Chalk partition wall 16 groove

Claims (2)

[Claims] Claim 1: A heating chamber for storing an object to be heated; a microwave supply means for supplying microwaves into the heating chamber;
In the microwave heating device comprising a door for opening and closing the opening of the heating chamber, a cross section G is formed on either one of an opening surrounding wall located around the opening and a portion of the door facing the opening surrounding wall. A microwave choke part is formed in the shape of a microwave choke part, a plurality of slits are formed in the microwave choke part at intervals from each other, and a choke partition wall located in the microwave choke part is inclined. heating device. 2. A method for manufacturing a microwave choke part that suppresses leakage of microwaves from a heating chamber to which microwaves are supplied, in which a metal plate for manufacturing the microwave choke part is prepared, A step of V-pressing a groove a predetermined distance inward from the peripheral edge of the plate, a step of bending the outside from the center by approximately 90° with the center inside the groove, and a step centering outside the groove, A step of bending the outer side from the center by an angle of less than 90 degrees, and after this step, centering on the groove and bending the outer side from this groove by approximately 90 degrees.
1. A method for manufacturing a microwave choke part, comprising the step of bending it by 0°.