JPS6035200Y2 - microwave oven - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a microwave oven equipped with a turntable.

In addition to high-heat cooking, recent microwave ovens reduce the microwave output to a low level by intermittent microwave oscillation from a magnetron, making it possible to perform fermented cooking.

In the case of fermentation cooking, the more the food is prevented from drying out, the better the finished product will be.

Therefore, in order to achieve this, not only the air blowing into the cooking chamber is stopped, but also the rotation of the turntable is stopped to suppress the air flow that occurs due to the rotation of the turntable.

However, if the rotation of the turntable is stopped, so-called uneven heating occurs, making it difficult to perform sufficient fermentation cooking.

The present invention has been devised in view of these points, and will be described in detail below based on the drawings of a microwave oven according to an embodiment of the present invention.

In FIG. 1, 1 is a cooking chamber, 2 is a door that opens and closes the front opening of the cooking chamber, and 3 is a food 4 disposed in the cooking chamber 1.
5 is a turntable drive motor (hereinafter referred to as TTT motor) that rotates the turntable.

The food 4 is heated by microwaves generated by a magnetron (described later), while the magnetron is cooled by air from a blower.

6 is a stark for stirring the microwave, and this stark is covered by a partition plate 7.

The Stark 6 is rotated by the wind from the blower after the magnetron has been cooled.

The air after rotating the Stark 6 is blown downward along the door 2, and then passes around the food 4 and is exhausted to the outside from the exhaust duct 8.

FIG. 2 shows a circuit diagram of the microwave oven, in which 9 is a high-voltage transformer, and 10 is a magnetron connected to the secondary side of the transformer via a voltage doubler rectifier circuit 11 consisting of a capacitor and a diode.

The TT motor 5 is connected in parallel to the primary side of the transformer 9, and is further connected to a commercial power source 13 via a changeover switch 12 and the like.

The changeover switch 12 has A and B contacts 12a.

12b, the primary side of the transformer 9 is directly connected to the A contact 12a, and the fermentation motor 1 is connected to the B contact 12b.
4 and one end of a disconnection switch 15 as a synchronizing means that is periodically turned on and off by a cam or the like that rotates in conjunction with the motor.

The other end of the on/off switch 15 is connected to one end of the transformer 9 together with the A contact 12a, and the other end of the fermentation motor 14 is connected to the other end of the transformer 9.

16 is the motor of the blower, and 17 is a blower switch connected in series to the motor. The switch is linked to the changeover switch 12, and is turned on or off by switching the changeover switch 12 to the A or B contact 12a112b, respectively. do.

18 is a timer consisting of a timer motor 19 and a time switch 20 interlocked with the timer motor, and 21 is a power supply fuse.

Next, the operation of the above microwave oven will be explained.

When performing high heat cooking, set the selector switch 12 to A contact 1.
2a and set the timer 18 to a predetermined time.

Then, the timer switch 20 is turned on, and the transformer 9 and T
The T-motor 5 is energized, the magnetron 10 starts oscillating microwaves, and the turntable 3 starts rotating.

Therefore, substantially even cooking is achieved by strong heating for a predetermined period of time.

Note that when the changeover switch 12 is connected to the A contact 12a, the blower switch 17 is turned on, and therefore, in the case of high-heat cooking, the blower motor 16 is also energized, so the starter 6
The food is cooked evenly because it rotates.

Thereafter, when a predetermined period of time has elapsed, the timer switch 20 is turned off, and the high-heat cooking ends.

Now, if you want to perform fermented cooking, set the selector switch 12 to B.
Switch to contact 12b and set timer 18 to a predetermined time.

Then, the timer switch 20 is turned on and fermentation cooking is started.

That is, the fermentation motor 14 is energized, the intermittent switch 15 is periodically turned on and off under the control of the fermentation motor 14, and the transformer 9 is intermittently energized to perform fermentation at low output by intermittent microwave oscillation. Cooking is done.

At this time, in synchronization with the intermittent oscillation of the microwave, the TT motor 5
is also intermittently energized.

That is, the TT motor 5 is also energized during microwave oscillation, and the TT motor 5 is also stopped energized when the microwave is stopped.

Therefore, the turntable 3 rotates intermittently.

However, the accompanying air flow is almost negligible.

The reason for this is that the microwave output during such intermittent oscillation is low, especially the output during the above fermentation cooking is about 20 to 30 W, which is less than 10% of the microwave output of 500 W during high heating cooking. For example, when the microwave oscillation is controlled at a cycle of 10 seconds, the oscillation is performed for only 1 second or less in the river sand, and therefore the turntable 3 also rotates only little by little, for 1 second or less in the river sand.

Therefore, even though the turntable 3 is rotated to eliminate heating unevenness, almost no airflow is generated, so that drying of the food 4 is suppressed.

Incidentally, since the blower switch 17 is also turned off at the same time when the changeover switch 12 is switched to the B contact point 12b, there is of course no air flow to the vicinity of the food 4 due to the blower.

Thereafter, when a predetermined period of time has elapsed, the time switch 20 is turned off, and the fermented cooking ends.

As is clear from the above explanation, according to the present invention, in a microwave oven that performs fermentation cooking by intermittent microwave oscillation of the magnetron and low microwave output, the turntable is synchronized with the intermittent microwave oscillation of the magnetron. By providing a synchronizing means that rotates the turntable intermittently, it is possible to eliminate uneven heating during fermentation cooking, and in this case, the rotation of the turntable in synchronization with the intermittent microwave oscillation accompanying fermentation cooking is extremely small. Since this rotation is not performed, no airflow is generated due to such rotation, and drying of the food can be significantly prevented, and the finished state of fermented cooking can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a microwave oven according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of the same microwave oven. 3... Turntable, 10... Magnetron, 15... Intermittent switch.

Claims (1)

[Scope of utility model registration request] A microwave oven that is equipped with a turntable and performs fermentation cooking by intermittent microwave oscillation of a magnetron to reduce the microwave output to a low output, and is provided with a synchronization means for intermittently rotating the turntable in synchronization with the intermittent oscillation of the magnetron wave. A microwave oven characterized by: