JPH04320721A - Device of cooking by heating - Google Patents

Abstract

PURPOSE:To prevent the microwave leakage that gives unfavorable influences on control devices, etc. CONSTITUTION:Between a shielding box 17 that constitutes a field damping chamber 21 attached to an inner box 6 and a motor 13 that drives a turntable 11, a second shielding box is provided which surrounds the output shaft 14 of the motor 13 and constitutes a shielding cylinder 25 or a second field damping chamber 36. With this arrangement microwaves do not leak into an outer box 1 and there is no unfavorable influences on a controller, etc., and a cooking device that employs heating and makes no erroneous action due to radio wave jamming is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device equipped with high-frequency heating means.

0002

[Prior Art] Microwave ovens that use a high-frequency heating device to cook food, and microwave ovens that are equipped with a high-frequency heating device and a heating device such as a heater to cook food, are widely used as home cooking devices. ing.

FIG. 6 is an external perspective view of a conventional microwave oven, and FIG. 7 is a schematic vertical sectional view of FIG. 6. In both figures, 1 is the main body, and an opening 2 is provided on the front side.
A door 3 is attached to the opening 2 so as to be openable and closable. Reference numeral 4 denotes an operation panel provided on the side of the opening 2. A power switch, a timer, an intensity setting button, etc. are provided on the surface of the operation panel 4, and a controller 5, electrical components, etc. are provided inside. Reference numeral 6 denotes an inner box forming the heating chamber 7, which is made of a heat-resistant material such as stainless steel, and whose inner surface is treated to reflect microwaves. A magnetron 8 is attached to the side wall of the inner box 6, and microwaves from the magnetron 8 are emitted into the heating chamber 7 from a power supply port 9.9a provided in the inner box 6.

Reference numeral 10 denotes a turntable drive device, in which a cylindrical connecting portion 12 passes through the bottom plate of the inner box 6 and is supported by the turntable 11 rotatably disposed within the heating chamber 7 and the main body 1. , and a motor 13 whose output shaft 14 is connected to the connecting portion 12 of the turntable 11.

Reference numeral 17 denotes a microwave shielding box made of, for example, a stainless steel plate, and as shown in FIG. The flange 20 is fitted onto the output shaft 14 of the motor 13, and the flange 20 is fixed to the bottom of the inner box 7 by welding to form a radio wave attenuation chamber 21. Note that 22 is a tray for placing foods, etc., made of heat-resistant glass.

[0006] In the above-mentioned microwave oven, the cooking utensil containing the food to be cooked is placed on the tray 22 and the door 3 is closed. Next, operate the operation panel 4 to set the heating time, heating temperature, etc., and then turn on the power, and the motor 13
is driven to rotate the turntable 11, and outputs microwaves from the magnetron 8 to feed the power inlet 9.9a.
The light is emitted from the inside of the heating chamber 7. The microwaves emitted into the heating chamber 7 are applied directly or reflected by the inner box 7 to the cooking container to heat the food to be cooked.

[0007]

[Problems to be Solved by the Invention] Most of the microwaves emitted from the magnetron 8 into the heating chamber 7 are applied to the cooking container, but a portion is transmitted between the inner box 6 and the connecting portion 12 of the turntable 11. It passes through and reaches the radio wave attenuation chamber 16, where it is attenuated and disappears. However, the microwaves are not completely attenuated, and some of the microwaves are still partially attenuated by the shielding box 17 and the motor 13.
may leak into the outer box 1 from between the output shaft 14 and the output shaft 14. Therefore, the leaked microwaves may act on the controller 5, causing malfunction.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a heating cooker equipped with a turntable drive unit that is free from the risk of microwave leakage into the outer box. be.

[0009]

[Means for Solving the Problems] A heating cooker according to the present invention includes a microwave shielding box attached to an inner box on the outside of the inner box in which a high-frequency heating means is attached and a turntable is arranged inside. A shield tube is provided between the turntable and the motor that drives the turntable, surrounding the output shaft of the motor and guiding the microwaves to the motor cabinet.

Furthermore, instead of the above-mentioned shielding tube, a second shielding box is provided between the motor and the shielding box, surrounding the output shaft of the motor, and constituting a radio wave attenuation chamber.

[0011]

[Operation] Most of the microwaves that enter the radio wave attenuation chamber through the connection between the inner box and the turntable are attenuated here, but some microwaves pass through the shielding cylinder and enter the motor cabinet. It is guided inward, where it attenuates and disappears completely.

Furthermore, when a second shielding box is provided, the microwaves leaked from the radio wave attenuation chamber are guided into the second shielding box and are almost attenuated. The remaining microwaves are further guided into the motor cabinet where they are attenuated and completely extinguished.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view schematically showing the main parts of the present invention. Note that the same or equivalent parts as those of the conventional example explained in FIG. 7 are given the same reference numerals, and the explanation will be omitted. Reference numeral 25 denotes a shielding cylinder made of, for example, a steel plate, interposed between the shielding box 17 and the motor 13, and as shown in FIG. It is formed in a size that can fit into the base part 16 of the cabinet 15 made of 13 steel plates, and its height h1 is the same as that of the shielding box 1.
The height h between the lower surface of the motor 7 and the upper surface of the cabinet 15 of the motor 13 is selected to be approximately equal. This shielding cylinder 25 is fixed to the lower surface of the shielding box 17 via a flange 27 with screws 29, and forms a guide path 28 between it and the output shaft 14. In this embodiment configured as described above, most of the microwaves that have passed between the inner box 6 and the connecting portion 12 of the turntable 11 and leaked into the radio wave attenuation chamber 21 are transmitted to the radio wave attenuation chamber 21.
Attenuates within 1. However, some microwaves
It enters into the cabinet 15 from between the cabinet 15 of the motor 13 and the output shaft 14 through the guide path 28 formed by the output shaft 14 of No. 3 and the shielding tube 25, and there it attenuates and disappears completely. Therefore, there is no risk of microwaves leaking into the outer box 1.

FIG. 3 is a cross-sectional view schematically showing the main parts of another embodiment of the present invention, and the same or equivalent parts as in the embodiment of FIG. In this embodiment, an example is shown in which a motor 13 is used in which the output shaft 14 is provided at an eccentric position in the cabinet 15. 31
is a second shielding box made of, for example, a steel plate, interposed between the shielding box 12 and the motor 13, as shown in FIG.
A through hole 33 at the bottom through which the output shaft 14 of the motor 13 is inserted.
a cylindrical portion 32 having a flange 34 and a flange 34;
It consists of mounting pieces 35, 35a provided on both sides of the
A second radio wave attenuation chamber 36 is formed. A shield plate 37 is interposed between the second shield box 31 and the motor 13 to prevent microwave leakage, and is made of a steel plate as shown in FIG.
a disk portion 38 having a through hole 39 that fits into the mounting pieces 40, which correspond to the mounting pieces 35, 35a of the second shielding box 31;
It consists of 40a.

Turntable drive device 1 as described above
0, first attach the screws 29 to the bottom of the shielding box 17.
The second shielding box 31 is fixed by. Next, the output shaft 14 of the motor 13 is inserted into the through hole 39 of the shield plate 37 and fitted into the base portion 16 of the cabinet 15, and the output shaft 14 is inserted into the connecting portion 12 of the turntable 11 and coupled. Next, the cabinet 15 of the motor 13, the disc part 38 and the mounting piece 40 of the shield plate 37, the flange 34 and the mounting piece 35 of the second shielding box 31, the mounting piece 4a of the shield plate 37, and the second shielding box. 31 mounting piece 35
a are stacked on top of each other and fixed together with screws 29.

In the turntable driving device 10 configured as described above, most of the microwaves that have entered the radio wave attenuation chamber 21 through the space between the inner box 6 and the connecting portion 12 of the turntable 11 are these radio waves. Although it is attenuated in the attenuation chamber 21,
Some of the microwaves pass between the output shaft 14 and the shielding box 17 and enter the second radio wave attenuation chamber 36, where most of the microwaves are attenuated and disappear. The remaining microwave further passes between the output shaft 14 and the cabinet 15 of the motor 13 and enters the cabinet 15, where it is attenuated and completely disappears.

In the above embodiment, the motor 13 with the output shaft 14 located eccentrically in the cabinet 15 is used, but as shown in FIG. If a motor 13 is used, the shield plate 37 may be omitted and the second shield box 31 may be directly attached to the cabinet 15 of the motor 13.

[0018]

Effects of the Invention As is clear from the above description, the present invention provides a shielding cylinder or a second shielding box between the shielding box constituting the radio wave attenuation chamber and the motor, and prevents the microscopic particles leaking from the shielding box. The waves are guided into the shielding cylinder or the second shielding box to be attenuated, and the remaining microwaves are guided into the motor cabinet to be completely attenuated, so that the microwaves leak into the outer box and cause damage to the controller. without having any negative impact on
It is possible to obtain a heating cooker that is free from malfunctions caused by microwaves.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing main parts of an embodiment of the present invention.

FIG. 2 is a perspective view of the embodiment of the shielding tube of FIG. 1;

FIG. 3 is a schematic diagram showing main parts of another embodiment of the present invention.

FIG. 4 is a perspective view of the embodiment of the second shielding box of FIG. 3;

FIG. 5 is a perspective view of the embodiment of the shield plate of FIG. 3;

FIG. 6 is a perspective view of an example of a conventional microwave oven.

FIG. 7 is a schematic diagram of FIG. 6 shown in cross section.

FIG. 8 is a perspective view of the shielding box of FIG. 7;

[Explanation of symbols]

1 Outer box 4 Operation panel 5 Controller 6 Inner box 7 Heating chamber 10 Turntable drive device 11 Turntable 13 Motor 14 Output shaft 15 Cabinet 17 Shielding box 21 Radio wave attenuation chamber 25 Shield tube 31 Second shielding box 36 Second radio wave attenuation chamber 37 Shield plate

Claims (2)

[Claims] Claim 1: An inner box provided in a main body and forming a heating chamber, a high-frequency heating means attached to the inner box, and an operation panel that includes a controller and the like and is disposed on the side of the inner box. and,
A turntable driving means includes a turntable disposed in the inner box, a motor provided outside the inner box for driving the turntable, and a turntable driving means fixed to the outside of the inner box surrounding the output shaft of the motor. It is characterized by comprising a shielding box and the like constituting a radio wave attenuation chamber, and a shielding cylinder is provided between the motor and the shielding box, surrounding the output shaft of the motor and guiding microwaves into the cabinet of the motor. Heating cooker. 2. A second shielding box that surrounds the output shaft of the motor and constitutes a radio wave attenuation chamber is provided between the motor and the shielding box in place of the shielding tube. heating cooker.