JPS6015042Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to cooling the inside of a microwave oven with a heater.

Cooking with a microwave oven uses radio waves to selectively heat food from the inside, which has the advantage of not raising the internal temperature and completing cooking quickly.

However, on the other hand, there is a drawback that it does not brown well.
Microwave ovens with built-in heaters have been manufactured to compensate for these shortcomings and enable oven cooking such as bread making and gratin dishes.

However, when cooking in an oven, it is necessary to keep the inside of the refrigerator at a high temperature, so the door and outside cabinet become hot, in contrast to when cooking in a microwave oven, the interior and exterior cabinet do not get very hot.

For this reason, there is a risk of getting burned if you accidentally touch a hot part if you forget that the exposed part will remain hot for a long time after using it as an oven. In this case, the inside of the oven must be used while it is still hot, which does not match the image of a microwave oven.

Therefore, the present invention attempts to quickly cool down the inside of the oven by adding a mechanism that can selectively operate the fan motor after use as an oven.

The structure will be explained below based on the drawings. For AC 100■, oven/microwave selector switches IA and IB are N and C.
side, that is, the microwave oven side, the contact 2 of the microwave timer is closed, the door switch 3 that monitors the door condition is closed, and the cooking button 4 is pressed, the voltage is applied to the primary side of the transformer 5, A high voltage is generated on the secondary side to cause the magnetron 6 to oscillate.

On the other hand, when the changeover switches IA and IB are set to the N and O sides, that is, the oven side, the contact 7 of the heater timer is connected to both ends of the heater 9 via the contact 8 of the temperature controller.
V voltage is applied.

When the time set by the timer has elapsed, contact 7 becomes 1.
The power supply to the heater 9 is stopped.

At this time, when the cooling button 10 is pressed, a current flows through the coil 11 of the relay, and the contact 13 of the changeover switch of the fan motor 12 for hot air stirring enters the N, O, side, and the coil has the contact 13.
A current flows through the fan motor 12 and is self-sustaining.
rotates.

Since the power supply to the heater 9 has already been stopped, the air generated by the rotation of the fan cools the inside of the oven.

After a certain period of time has passed in this state, the timer contact 7
l off, 100V is not applied to the coil, and no current flows to the relay coil 11 through the contact 13a, so self-holding is canceled and the contact of the fan motor changeover switch 13 is set to the N and C sides. Become.

According to the above configuration, after using the oven, the oven can be cooled simply by pressing the cooling button.

In addition, there are some oven dishes, such as choux pastry and cakes, that are best left in a hot atmosphere for a while after cooking, so you can selectively use the cooling button to can be reliably restored.

It is also possible to use the magnetron cooling fan motor 14 as the cooling fan motor by attaching some changeover switches.

[Brief explanation of the drawing]

The drawing is a circuit diagram of a high frequency heating device showing an embodiment of the present invention. 7...Timer contact, 12...Fan motor, 10...Cooling switch, 11...
... Relay coil, 13... Changeover switch.

Claims (1)

[Scope of utility model registration request] It has a high frequency heating circuit, a heater heating circuit, and a changeover switch for switching between the high frequency heating circuit and the heater heating circuit, and the heater heating circuit is connected to one of the changeover switches. a switch having a means for selectively operating and automatically holding three contacts of the timer; a fan motor connected in series with the switch at first and second contacts of the switch; A heater connected to a first contact that is a contact on the automatically normally closed side of the switch and the other end of the changeover switch that is the terminal end of the fan motor, and the switch is in the first contact position. When the switch is in the second contact position, the heater and the fan motor can be energized simultaneously, and when the switch is in the second contact position, the heater is prohibited from being energized, and the fan motor can be energized via the energization selection means. and a high frequency heating device that prohibits energization of the heater heating circuit when the switch is in the third contact position.