JPS6326516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to preheating of heater-type cooking utensils.

Conventionally, in complex electric cookers that also have heater-type cooking means, such as ovens with microwave ovens, the time switch also serves as a power switch, so it was necessary to set the time switch to preheat the inside of the heating chamber. . However, the time switch opens the power circuit after the set time has elapsed, so if you leave it on for a long time even though you thought it was preheated, the temperature inside the refrigerator will drop. Also, it was a hassle to not only have to set the cooking time but also to set the timer for preheating. Therefore, the present invention eliminates the troublesome preheating operation described above by providing a dedicated button for preheating, allowing preheating to be set when the time switch is off, and adding a preheating circuit that is canceled when the time switch is set. It is something to be solved. Also shown is an example in which this preheating circuit is applied to a combination cooker, such as a microwave oven with a heater. The configuration will be explained below based on the drawings.

When time switch 1 is off, its contact 2
is connected to the NC terminal 10, and when the pushbutton switch 3 is pressed and the coil 5 of the relay 4 is energized, the relay contact 6 is closed, the contact 7 is turned on, and the power supply voltage is the same as that of the time switch 1. NC terminal 1
0, is supplied to the heater 9 via the NO terminal 11 of the relay and the contact 8 of the temperature regulator. Even if the pushbutton switch 3 is released, the voltage is applied to the relay coil 5 through the contact 6, so the relay circuit is self-maintained, and the supply of power supply voltage to the heater 9 is controlled by the contact 8 of the temperature controller. Controlled only by opening and closing. Next, when the time switch 1 is set, its contact 2 is connected to the NO terminal 12, so the current that was flowing to the relay coil 5 via the contact 6 stops flowing, and the relay contacts 7 and 6 change as shown in Figure 1. It will be in the position shown. At this time, the power supply voltage is supplied to the heater 9 via the NO terminal 12 of the time switch, the contact 7 of the relay, and the contact 8 of the temperature controller.
The supply of electricity to the heater 9 is controlled by opening and closing the time switch 1 and the contact 8 of the temperature controller.

FIG. 2 shows an example in which a switch 13 that is linked to the opening and closing of a door is installed on the load side of the NC terminal 10 of the time switch 1. In this circuit, the preheating circuit is released when the door is opened to put in the food.

FIG. 3 shows an example in which a preheating circuit is incorporated into a combination cooker and an oven with a microwave oven. time switch 1
A switch 14 for switching the load controlled by the time switch 1 is connected to the load side of the NO terminal 12 of the switch 15, which operates in conjunction with the switch 14.
This is an example in which the time switch 1 is connected to the load side of the NC terminal 10 of the time switch 1. When the contact of the switch 14 is switched to the NO terminal and the time switch 1 is controlled by the microwave oven, the switch 15 is opened, so no current flows through the coil 5 of the relay 4.
The contact of the changeover switch 14 enters the NC side (that is, the heater 9 is now controlled by the time switch 1).
Only when a preheating circuit is formed. Figure 4 also shows a door switch 16 linked to the opening and closing of the door in the above circuit.
In this example, the preheating circuit is turned on after the NC terminal 10 of the time switch 1, and the preheating circuit can be released by opening the door.

As described above, this preheating circuit performs a preheating operation by pressing a button. Canceling this operation is done at the same time as setting the cooking time with the time switch, so there is no hassle.
If the time switch is set, no circuit is formed and there is no need to worry about erroneous operation. In addition, once the preheating operation starts, it continues until the time switch is set, so there is no need to worry about the time switch returning and the inside of the oven becoming cold again, unlike in conventional ovens, providing an easy-to-use preheating method. . In addition, by linking it with the changeover switch or the door, the preheating circuit can be activated only when the heater is in use, so if the microwave oven is selected as the control target of the time switch, it will not work. Furthermore, it is possible to realize a rational preheating method for a condenser cooker, in which the preheating circuit does not operate even if the preheating button is pressed.

[Brief explanation of drawings]

1 to 4 are diagrams showing respective embodiments of electric circuits for realizing the present invention. 1...Time switch, 4...Relay, 3...
Push button switch, 13, 16... door switch, 14, 15... changeover switch.

Claims (1)

[Scope of Claims] 1. A time switch that is equipped with a heater heating means and a dielectric heating means and has normally open and normally closed terminals, a relay that has two circuits for controlling energization to the heater heating means, and the above. The common terminal of the time switch is connected to the power supply side, and one end of the coil of the relay is connected to the normally closed terminal of the time switch. A pushbutton switch and a normally open terminal of the relay are connected in parallel between the two, and the other normally open terminal of the relay and the normally open terminal of the time switch are connected via a switch that releases the relay in conjunction with the selection switch. a normally closed terminal of the relay and a normally open terminal of the time switch; and a common terminal of the relay is connected to the heater heating means. 2. The electric cooking appliance according to claim 1, further comprising a switch that operates in conjunction with opening and closing of the door between the normally closed terminal of the time switch and the switch that releases the relay.