KR920004917Y1 - Safety device of electronic range - Google Patents

Abstract

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Description

Microwave Oven

1 is a schematic diagram of a microwave oven to which the present invention is applied.

2 is a conventional microwave driving circuit diagram.

3 is a microwave driving circuit diagram of the present invention.

4 is an embodiment of the microwave protection device of the present invention, a is a protection circuit when the cooking plate is seated, b is a protection circuit diagram when the cooking plate is not seated.

* Explanation of symbols for main parts of the drawings

1: cooking dish 2: rotating tray

3: rotating motor 5: rotating shaft

7: spring 8: flow groove

9: Split pin 10: Cooking plate detection switch

12: protrusion 20: microcomputer

Q1: transistors R1, R2, R3, R4: resistors

RY1, RY2: Relay switch RY: Relay

The present invention relates to a protection device for a microwave oven, and in particular, by detecting the detachment of a cooking plate on which a heating element is placed, and when the cooking plate is not mounted, by cutting off the power supply to the high-pressure generating unit, the microwave from high pressure It relates to a protection device of a microwave oven to protect the.

In general, microwave ovens heat the microwave and food, so various protection devices are required. In a conventional microwave oven, only the door is opened and the door is opened, so that power is not supplied to the high-pressure generator. It was only to be protected from high voltage by preventing the drive of a microwave oven.

Therefore, in the case of a microwave oven that is heated and cooked at a very high frequency from a high-pressure generator while rotating the rotating motor while the heating element is placed on the cooking plate by rotating the cooking plate on the rotating plate with the rotating plate, sometimes the dish is washed. There is a concern that the microwave oven may be operated in a state in which the cooking plate is not seated on the rotating support, and at this time, when the power is supplied by the user's subcircumference, the microwave oven may not only damage the microwave oven but also cause a fire. .

Therefore, the object of the present invention is to prevent the microwave oven from operating by cutting off the power supply to the high-pressure generator when it is not seated by detecting whether the cooking plate is seated on the rotary support in the microwave oven, thereby protecting the microwave oven from high pressure. In order to realize the purpose of the present invention, the present invention forms an induction groove on the rotation axis of the rotary motor to which the lower part of the rotary bearing is condensed, and the flow groove is separated from the spring supported by the lower groove. Flow device interposed between the split pin and the projection to prevent the plate, cooking plate detachment detection device for detecting the detachment state of the assembly plate by the flow of the flow device up and down, and receives and controls the signal detected from the detachment detection device The microcomputer, the relay excited by the output of the microcomputer, and the relay And an open relay switch.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an opening and closing view of a microwave oven to which the present invention is applied, and a rotating motor 3 is fixed as a screw 6 on a bracket mounted on the bottom surface of the cooking chamber 4, and the shaft 5 of the rotating motor 3 is fixed. In the microwave oven is fitted with a rotary support 2 is rotated by the rotary motor (3), the upper portion of the rotary support (2) to seat the cooking dish (1) on which the heating element is placed, A shaft 5 of the rotary motor 3 into which the rotary support 2 is fitted forms a flow groove 8 in the longitudinal direction at the center thereof, and a spring 7 mounted at the bottom thereof is detached from the flow groove 8. Insertion of the projecting plate (12) having a split pin (9) to prevent the insertion of the cooking plate (1), the flow formed on the shaft (5) of the rotary motor (3) by the weight of the cooking plate (1) When the split pin 9 of the protruding piece 12 inserted between the grooves 8 is pressed downward along the flow groove 8, the spring 7 is compressed and there is no cooking plate 1. A flow device such that the split pin 9 of the protruding piece 12 rises upward along the flow groove 8 by the elastic force of the compressed spring 7, and the rotational support of the lower end of the cooking chamber 4 2) One side of the switch support 11 is fixedly installed, the switch support 11 is a cooking plate detection switch for detecting the detachment of the cooking plate as the protruding piece 12 moves up and down in the flow groove (8) It is composed of a cooking plate detachment and detection device made in (10).

Therefore, when the cooking plate 1 is seated, the split pin 9 of the protruding piece 12 is lowered along the flow groove 8 formed in the shaft 5 while being compressed by the spring 7 by the weight of the cooking plate 1. The cooking plate detection switch 10 is turned off, and in the state where the cooking plate is not seated, the spring 7 is elastic and the split pin 9 of the protruding piece 12 is raised along the flow groove 8 so as to protrude. Piece 12 turns on the cooking plate detection switch 10 to detect the detachment of the cooking plate.

2 shows a conventional microwave driving circuit diagram, and FIG. 3 shows a microwave driving circuit diagram of the present invention.

Here, the lamp switch relay switch RY1 is configured at the front end of the lamp 1, and a temperature switch TCO that cuts off the power when the temperature rises is connected to the power supply side.

Safety switch (SW1) (SW2) (SW3) according to whether the door is opened or closed is configured at the front of fan motor (FM) and rotary motor (3), and stable relay switch (RY2) is connected to output high voltage transformer (HVT). have.

The present invention is configured to be connected when the stable relay switch (RY2) for controlling the power supplied to the output high-voltage transformer (HVT) is seated in the cooking dish.

FIG. 4 shows a protection circuit diagram for controlling the opening and closing of the stabilizing relay switch RY2 of FIG.

The cooking plate detecting switch 10 is configured to be connected to the input port A of the microcomputer 20 through the resistors R3 and R4 through which the power supply VCC is distributed, and the output port B of the microcomputer 20. Is configured to control the operation of the relay RY control transistor Q through the resistors R1 and R2.

Referring to the operation and effects of the present invention configured as described above are as follows.

In the microwave driving circuit, during normal driving, the safety switches SW1 and SW2 are connected and the safety switches SW3 are opened.

The relay switch RY1 is connected in normal operation to light the lamp L when the food is heated.

And the fan motor (FM) for cooling is operated and the rotary motor (3) is operated to rotate the cooking dish.

The relay switch RY2 controls the power supplied to the high voltage transformer HVT to control the output of the magnetron. In the state where the cooking dish 1 is seated on the rotary support 2 as in the first diagram, Since the partition plate 9 of the flow apparatus descends along the flow groove 8 formed in the shaft 5 to the lower side by the weight of the support 2, the protruding piece 12 is cooked. The detection switch 10 is turned off.

That is, when the cooking plate detection switch 10 is in the off state, a circuit is formed as shown in FIG. 4A.

Therefore, the power supply VCC is distributed to the input port A of the microcomputer 20 through the resistors R3 and R4 and input as a H level signal, and the signal input from the output port B of the microcomputer 20 is input. Outputs the inverted L-level signal, the L-level signal does not conduct the transistor Q1 and becomes a cut-off state, and thus the relay RY2 cannot be operated, and thus the output adjustment relay switch RY2 of FIG. 3 is normally connected. As a state, the output of the high voltage transformer is controlled.

However, in FIG. 1, when the cooking dish 1 is not seated on the rotary support 2, the split pin 9 of the protruding piece 12 is caused by the spring force of the spring 7 to form the uppermost portion of the flow groove 8. Since the rotating support 2 is imagined, the protruding piece 12 connects the cooking dish detection switch 10 ("on" state).

Therefore, when the cooking dish detection switch 10 is connected, a circuit like the fourth diagram is formed.

That is, the power supply VCC distributed through the resistors R3 and R4 flows to the ground through the cooking plate detection switch 10, and the L level signal is input to the input port A of the microcomputer 20.

When the L level signal is applied to the input port A, the output port B of the microcomputer 20 outputs the H level signal to turn on the transistor Q1, so that the relay RY is excited.

Therefore, when the relay RY is excited, the relay switch RY2 is opened to cut off the power supplied to the secondary side magnetron of the high voltage transformer HVT, thereby preventing the microwave oven from operating.

As such, the present invention installs a flow device by a spring at the lower end of the rotating support to detect the detachment of the cooking dish, and supplies power to the high voltage transformer by controlling the relay switch in the microcomputer according to the detachment of the cooking dish as described above. You can protect your microwave by blocking it.

As described above, the present invention detects the detachment of the cooking plate mounted on the rotary support, and controls the operation of the high pressure transformer by the switch operation according to the sensing state, so that the high pressure plate is not placed on the rotary support. The driving of the generator unit is provided to the battery, thereby providing an effect of protecting the microwave oven from high pressure.

Claims (2)

The rotary motor 3 is fixed on the bracket installed on the bottom of the cooking chamber 4, and the rotary support 2 is fitted to the shaft 5 of the rotary motor 3, and the upper portion of the rotary support 2 is provided. In the microwave oven in which the cooking plate 1 on which the heating object is to be placed is seated, on the shaft 5 of the rotary motor 3 to which the rotating support 2 is fitted, In accordance with the flow device is provided to flow up and down, one side of the flow device is detachable detection device consisting of a cooking dish detection switch 10 to detect the cooking plate detachment while driving on and off in accordance with the up and down flow of the flow apparatus And on / off driving according to the output control signal of the microcomputer 20 and the microcomputer 20 outputting a control signal corresponding to the input signal detected by the detachable detecting device and the relay RY and the sound relay. High voltage transformer by on / off drive of (RY) Protective device for a microwave oven, characterized in that consisting of a relay switch (RT2) for supplying and cutting off the power supply (HVT). 2. The flow apparatus according to claim 1, wherein the flow device forms a flow groove (8) on the shaft (5) of the rotary motor (3), and the flow groove (8) is detached from the spring (7) mounted at the bottom. And a dividing pin (9) having a protruding piece (12) for preventing and turning the cooking dish detecting device on and off.