JPH06281161A - Microwave range - Google Patents

Abstract

PURPOSE:To prevent bad influence of heat on a motor for driving a turn table by a method wherein air in an inside space of a fixture to fix the motor to an outer wall of a heating chamber is discharged to the outside through a vent hole, so that the heat may not be accumulated in the inside space. CONSTITUTION:A microwave oven in which a turn table is driven by a motor arranged outside a heating chamber is provided with a through hole 9 made in a bottom wall of the heating chamber so that a motor output shaft 8 may pass through it. The microwave oven is further provided with a fixture which is interposed between an outer wall of the heating chamber and the motor to fix the motor to an outer wall of the heating chamber. At this time, the motor output shaft 8 is positioned to protrude into the heating chamber through the through hole 9. In addition the fixture has an inside space 18 surrounding the motor output shaft 8 between the periphery of the through hole 9 and the motor output shaft 8, and also vent holes 20 and 21 through which ventilation can be made from the inside space to the outside of the fixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven provided with a turntable on which food is placed inside a heating chamber and provided with a turntable driving motor outside the heating chamber.

[0002]

2. Description of the Related Art Conventionally, in a microwave oven of this type, in order to prevent microwaves from leaking to the outside of the heating chamber from the motor shaft through hole in the bottom wall of the heating chamber, a motor having a closed space around the motor shaft is mounted. The motor is installed on the outer wall of the heating chamber using a member (for example, Japanese Patent Laid-Open No. 4-188).
595).

[0003]

However, in such a microwave oven, the air in the enclosed space formed around the motor shaft causes heat conduction from the heating chamber and leakage of microwaves from the motor shaft through hole. However, there is a problem in that the temperature rises due to the heating action by the, and the motor is thermally adversely affected.

The present invention has been made in consideration of the above circumstances, and in the motor mounting member, the internal space surrounding the motor output shaft can be ventilated to the outside, so that the heat applied to the motor can be improved. The present invention provides a microwave oven capable of preventing adverse effects.

[0005]

According to the present invention, in a microwave oven configured to drive a turntable inside a heating chamber by a motor provided outside the heating chamber, the motor output shaft is formed through the bottom wall of the heating chamber. And a mounting member for mounting the motor on the outer wall of the heating chamber such that the motor output shaft is interposed between the outer wall of the heating chamber and the motor so that the motor output shaft projects into the heating chamber through the through hole. The present invention provides a microwave oven, comprising: an inner space surrounding a motor output shaft between the periphery of the through hole and the motor; and a vent hole capable of ventilating from the inner space to the outside of the mounting member. .

[0006]

The microwaves that are about to leak to the outside of the heating chamber through the through holes are prevented from leaking by the internal space of the mounting member, and the air in the internal space is exchanged with the external air through the ventilation holes. Therefore, the conduction heat from the heating chamber and the heat generated by the heating action of the leaking microwaves are not accumulated in the air in the internal space, and the thermal influence on the motor is suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. This does not limit the present invention.

FIG. 1 is a perspective view showing a microwave oven according to an embodiment of the present invention, in which 1 is a main body, 2 is a heating chamber, 3 is a turntable provided in the heating chamber 2, and 4 is the opening and closing of the heating chamber. Doors 5 are operation panels for setting heating conditions, and the main body 1
Further, the magnetron for supplying microwaves to the heating chamber and its control electric parts are housed inside the chamber, which will be described later.

FIG. 2 is a partial cross-sectional view showing the details of the essential parts of FIG. 1, in which the heating chamber bottom plate 6 is provided with a geared motor 7 for driving the turntable 3, and the output shaft 8 of the motor 7 is formed on the bottom plate 6. It penetrates through the formed through hole 9 and projects into the heating chamber 2, and is connected to the turntable 3 via a connecting member 10 provided at the tip thereof.

Further, the motor 7 is attached to the outside of the heating chamber bottom plate 6 by a fitting 11. Mounting bracket 1
As shown in FIG. 3, 1 has an opening 13 having substantially the same diameter as the outer diameter of the peripheral flange 12 of the through hole 9 of the heating chamber bottom plate 6,
The heating chamber bottom plate 6 is screwed through the screw holes 16 so that the openings 13 fit into the peripheral flange 12.

In this fixed state, the upper surface 15 of the motor 7 is attached so as to be in close contact with the flat bottom plate 14 of the metal fitting 11. Then, the fitting 11 has an opening 13
And the bottom plate 14, there is an integral bell-shaped inclined plate 17, which forms an internal space 18 surrounding the output shaft 8 between the flange 12 and the upper surface 15, and further includes the inclined plate 17 and The side plates 19 of the metal fitting 11 have ventilation holes 20, 21 respectively.
Are formed.

In such a structure, even if microwaves try to leak out of the bottom plate 6 through the through holes 9, they are stopped by the internal space 18 of the mounting member 11. Further, when the temperature of the air in the internal space 18 rises due to the heat of the heating chamber 2 or the heating action of microwaves, the air in the internal space 18 is replaced with the cool air outside through the ventilation holes 20 and 21, so that the air in the internal space 18 is heated. It is not stored and therefore the motor is not affected by the heat. In addition, the ventilation holes 20 and 2
The number and size of 1 are set to the extent that microwaves are not leaked to the outside.

FIG. 4 is an explanatory view showing the internal structure of the heating chamber 2, in which the blue lamps 2 are respectively provided on the upper portions of the left and right inner walls.
2 and a red lamp 23 are provided. FIG. 5 is a front view of the operation panel 5, 24 is a heating time setting timer, 2
Reference numeral 5 is a blue push button, and 26 is a red push button. Also, 27
Is a push button for opening and closing the door 4.

FIG. 6 is an electric circuit diagram showing a control circuit of this embodiment, where PS is an input AC power source, FU is a fuse, and D is a fuse.
S is a door switch that opens and closes in response to opening and closing of the door 4, TS
Is a contact of the timer 24, and contact TS is the timer 24
Turns on when the time setting operation is performed, and turns off when the set time has elapsed.

PB is a seesaw switch operated by the push buttons 25 and 26. When the push button 25 is pushed, the contact points connect between A and C, and when the push button 26 is pushed, the contact point is B-.
Connect between C. RY is a relay coil that opens and closes the contact RS, TR is a step-up transformer, D is a diode, MT is a magnetron, and C1 and C2 are capacitors. The magnetron MT outputs 200 W when the contact RS is OFF, and the magnetron MT outputs 50 W when the contact RS is ON.
It is designed to output 0 W.

In such a circuit configuration, when the door 4 is closed, the door switch DS is turned on, and the timer 24 is set to a certain time (for example, 3 minutes), the magnetron MT starts to output and the heating chamber 2 is heated. Heat food. At this time, when the blue push button 25 is pressed, the blue lamp 22 is turned on to illuminate the inside of the heating chamber 2 and the magnetron MT outputs 200 W.

When the push button 26 of the red push button 26 is pushed, the red lamp 23 is turned on to illuminate the inside of the heating chamber 2 and the magnetron MT outputs 500 W.

Therefore, when the output of the magnetron MT is changed according to the amount of food and the cooking method (defrosting or warming), the illumination color of the heating chamber 2 changes according to the output of the magnetron MT, so the push button 25, It is possible to prevent an erroneous pressing of 26, that is, an erroneous setting of the magnetron output.

FIG. 7 is a sectional view of a cooking container applied to the microwave oven of this embodiment, in which the container body 28 has an opening 29.
Upper container 30 having a lower container 3 having a bottom 31
2, the screw thread formed on the outer peripheral surface of the lower end of the upper container 30 and the screw thread formed on the inner peripheral surface of the upper end of the lower container 32 are engaged with each other to connect the container 30 and the lower container 32. . The lower container 32 is formed of a material having a higher dielectric constant than the upper container 30.

For example, when the upper container is made of quartz glass having a relative dielectric constant of 3.8, the lower container has a relative dielectric constant of 6.
7 soda glass.

When the liquid body to be heated is housed in the container body 28 thus constructed and placed on the turntable 3 of the heating chamber 2 and microwave heating is carried out, the lower container 32 is lower than the upper container 30. Since the microwave energy absorption rate is high, the object to be heated in the container is smoothly convected and heated uniformly.

[0022]

According to the present invention, the air in the inner space of the mounting member for mounting the turntable driving motor on the outer wall of the heating chamber is vented to the outside through the vent hole, and heat is not accumulated in the inner space. The adverse effect of heat on the motor is suppressed.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a main part of FIG.

FIG. 3 is a top view of the mounting bracket of the embodiment.

FIG. 4 is an explanatory view showing the inside of the heating chamber of the embodiment.

FIG. 5 is a front view of the operation panel of the embodiment.

FIG. 6 is an electric circuit diagram showing a control circuit of the embodiment.

FIG. 7 is a cross-sectional view showing the cooking container of the embodiment.

[Explanation of symbols]

 1 main body 2 heating chamber 3 turntable 4 door 5 operation panel 6 heating chamber bottom plate 7 gard motor 8 output shaft 9 through hole 10 connecting member 11 mounting bracket 12 peripheral flange 13 opening 14 bottom plate 15 upper surface 16 screw hole 17 inclined plate 18 internal space 19 Side plate 20, 21 Ventilation holes

Claims (1)

[Claims] 1. A microwave oven configured to drive a turntable in a heating chamber by a motor provided outside the heating chamber, and a through hole formed in a bottom wall of the heating chamber for penetrating a motor output shaft, and an outer wall of the heating chamber. A mounting member for mounting the motor on the outer wall of the heating chamber such that the motor output shaft is interposed between the motor and the motor so as to project into the heating chamber through the through hole.
The microwave oven, wherein the mounting member includes an internal space that surrounds the motor output shaft between the peripheral edge of the through hole and the motor, and a vent hole that allows ventilation from the internal space to the outside of the mounting member.