JPH0116963Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a composite cooker equipped with a heat source for oven cooking and a magnetron for high frequency cooking.

Conventionally, in this type of apparatus, a magnetron cooling blower A was connected via an oven body overheat prevention switch B, and a heat source control circuit C for oven cooking was connected in parallel, as shown in FIG. 1, for example. Furthermore, it is known that a relay E for opening and closing a load circuit D for high frequency oscillation is connected in parallel to the blower A via a magnetron overheat prevention switch F. (Utility Model Application No. 56-144202) In these devices, magnetron cooling blower A is used for both oven heating cooking and high frequency heating cooking.
is used to cool the magnetron, drive the stirrer, and cool various electronic components. However, even if cooling blower A is disconnected and does not rotate, oven heating and high-frequency heating cannot be operated. Moreover, when heating the oven, the temperature of each electronic component and magnetron rises abnormally.
This has disadvantages such as failure, poor durability, and reduced reliability of each component.

The present invention aims to eliminate such inconveniences, and includes a heat source H control circuit 1 for oven cooking and a load circuit 2 for high frequency cooking provided in the cooker I.
In addition, in the case where the magnetron cooling blower 3 is connected, one side is connected to the cooling blower 3 via the oven body overheat prevention switch 5.
A heat source control circuit 1 for oven cooking and a load circuit 2 for high frequency cooking are connected in parallel to the other via a rotation detection device 6 of the blower 3.

An embodiment will be described with reference to the drawings. FIG. 2 is a circuit diagram of an embodiment of the present invention. Reference numeral 1 denotes a heat source control circuit for oven cooking, which includes a gas supply circuit to a gas burner, etc., an oven internal temperature control circuit, an ignition or misfire safety circuit, and the like. 2 is a magnetron oscillation circuit for high frequency oscillation, and its load circuit is shown. Reference numeral 7 denotes a power switch, and when the switch is closed, the magnetron cooling blower 3 is connected to the oven body overheating switch 5 via the oven body overheating switch 5. A rotation detection device 6 that detects wind pressure, air volume, etc. by driving the blower 3 is connected here. For example, a pressure switch that detects wind pressure is provided, and the discharge force of the blower 3 is detected by the rotation of the blower 3, and conduction is established. Each heat source control circuit 1 and load circuit 2 are connected in parallel via the rotation detection device 6 and the magnetron overheat prevention switch 8.

FIG. 3 is a circuit diagram showing another embodiment, in which electrical control to the load circuit 2 is performed via a relay 11 that opens and closes the load circuit 2 of high frequency oscillation. A relay 1 opens and closes a heat source control circuit 1 for oven cooking and a load circuit 2 for high frequency cooking with respect to a magnetron cooling blower 3 via a rotation detection device 6 and a magnetron overheat prevention switch 8.
1 are connected in parallel and controlled indirectly. That is, by turning on the power switch 7, the rotation of the magnetron cooling blower 3 is detected and conductive, and when the switch 9 is closed, oven cooking can be performed. On the other hand, if the switch 10 is closed, the relay switches 12, 12 are connected to the load circuit 2 via the relay 3, and high-frequency overheating cooking is performed.

FIG. 4 is a cross-sectional view of the structure of an embodiment of the present invention, in which the magnetron G is rotated by the blades 4' of the stirrer 4 using the cooling air from the blower 3 that cools the heat exchange part. Direct ventilation.
Further, in order to detect the rotation of the blower 3, a pressure detection port is attached to the discharge port of the blower 3 (the pressure may be taken out on the intake side), and a configuration of a detection device 6 using a diaphragm type pressure switch is shown. Here, the rotation detection device may be one that detects the drive of the blower 3 using a diaphragm type, a centrifugal force detection type provided on the blower shaft, a resistance type wind speed detection type, or the like. The magnetron cooling blower 3 is
The magnetron G is cooled, the stirrer 4 is rotated, and electrical components such as a control device are cooled.

FIG. 5 is a circuit diagram of another embodiment, in which the rotation detection device 6 of the blower 3 is connected to the input side of the heat source control circuit 1, so that oven cooking cannot be performed in the event of a failure of the blower 3. timer 15,1
5' and a door switch 16 etc. are shown.

Next, to explain its operation, when the magnetron cooling blower 3 is in an abnormal state (unable to rotate due to wire breakage, etc.), the power to the oven heat source control circuit 1 and the load circuit 2 for high-frequency cooking is cut off unless it rotates. be. For example, as shown in Figure 5,
It is necessary to turn off the power to the oven heat source control circuit 1 when the blower 3 is stopped.
At this time, the temperature of the electronic components is prevented from rising. Furthermore, the magnetron G can be de-energized by the magnetron overheat prevention switch 8, but since the life of the magnetron will be shortened, it is desirable to have one that shuts off both circuits 1 and 2, as shown in Fig. 2.
The circuit is configured in the circuit shown in Fig. 3, and a rotation detection device 6 that uses the wind pressure of the cooling blower 3 is connected to prevent oven cooking in the event of a failure of the cooling blower 3 and to prevent electrical components, etc. Overheating is prevented as much as possible.

As described above, according to the present invention, the power supply to the oven cooking heat source control circuit 1 or the circuit 1 and the high-frequency heating load circuit 2 is cut off when the magnetron cooling blower 3 is abnormal, so that it cannot operate. This has the effect of preventing the deterioration of electronic components due to overheating, which is the disadvantage of the conventional method described above, and increasing the durability of the magnetron so that it can withstand long-term use.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional example, Fig. 2 is a circuit diagram of the present invention, Fig. 3 is a circuit diagram showing another embodiment, and Fig. 4 is a circuit diagram of a conventional example.
The figure is a cross-sectional view of the structure of the present invention, and FIG. 5 is a circuit diagram of another embodiment. 1...Heat source control circuit, 2...Load circuit, 3...
Blower, 4... Stirrer, 5... Oven body overheat prevention switch, 6... Detection device, 7... Power switch, 8... Magnetron overheat prevention switch, 9, 10... Switch, 11... Relay, 1
3,14...Switch.

Claims (1)

[Scope of utility model registration request] A heat source H control circuit 1 for oven cooking and a load circuit 2 for high-frequency cooking are provided in the cooker I, and in a device to which a magnetron cooling blower 3 is connected, an oven body heating prevention switch 5 is installed. , one side is connected to the cooling blower 3,
A composite cooking device characterized in that a heat source control circuit 1 for oven cooking and a load circuit 2 for high frequency cooking are connected in parallel via a rotation detection device 6 of the blower 3 on the other hand.