JP3653968B2 - High frequency heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating device such as a microwave oven, and particularly to high-frequency leakage from a door.
[0002]
[Prior art]
Conventionally, as shown in FIG. 6, the vertical opening type high-frequency heating device of the door includes a first interlock switch 2 and a second interlock switch 3 that turn on and off the high-frequency power supply in response to opening and closing of the door 14. Is provided.
[0003]
The first interlock 2 operates via an operation pin A12 provided at the free end portion of the door 14 and a lever A22B attached to a switch mounting plate 20B provided on the side of the heating chamber 10, and the electrical appliance control method The high-frequency leakage value 5 mw / cm 2 determined in (1) is guaranteed.
[0004]
However, since the second interlock switch 3 operates via the door arm 16B attached to the door 14 and the lever B26B attached to the switch mounting plate 20B, there is no problem with the electrical equipment control method that currently does not have regulations. However, 5 mw / cm 2 of the IEC standard, which is an international standard, cannot be guaranteed.
[0005]
In the future, the Electrical Appliance and Material Control Law may be required to guarantee a high-frequency leakage value of 5 mw / cm 2 or less when both the first and second interlock switches 2 and 3 are OFF, as in the IEC standard.
[0006]
[Problems to be solved by the invention]
Since the door arm 16B is positioned in the vicinity of the hinge 11 of the door 14 as in the above-described conventional configuration, when the second interlock switch 3 is turned off when the door 14 is opened, the door 14 opens greatly, and high-frequency leakage occurs. The value exceeded the 5 mw / cm 2 of the IEC standard.
[0007]
Further, since the position of the door arm 16B varies depending on the size of the product, it cannot be shared and miniaturized as a switch assembly, which hinders space saving of the product.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an operation pin B in the vicinity of the operation pin A provided at the free end portion of the door, and operates the second interlock switch via the lever B mounted on the switch mounting plate. As a result, when the door is opened, the second interlock switch can be turned off with a small opening of the door, and the IEC standard can be satisfied.
[0009]
In addition, the lever B is provided with a pin guide on the front plate of the heating chamber so that it cannot be easily operated by humans, and is also designed for safety.
[0010]
Further, the lever A and the lever B are arranged on both sides with the switch mounting plate at the center, and the dimensions can be compressed particularly in the depth direction of the product, and a space-saving product is possible.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the above-described problems, the present invention provides a heating chamber that accommodates and heats food, a high-frequency generator that supplies a high frequency to the heating chamber, and an operation pin A and an operation pin B that face the opening surface of the heating chamber. A freely openable / closable door, a first interlock switch operating in conjunction with the operation of the operation pin A and operating via a lever A mounted on a switch mounting plate located on the side of the heating chamber, and the operation pin In conjunction with the operation of B, a pin guide mounted on the front plate of the heating chamber and a second interlock switch that operates via a lever B mounted on the switch mounting plate are provided. The switch mounting plate is arranged on both sides with the switch mounting plate in the center.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a configuration diagram showing a detailed configuration of the high-frequency heating device of the present invention. 2 is an external perspective view, FIG. 3 is a circuit diagram, FIG. 4 is a main part configuration diagram, and FIG. 5 is a main part configuration diagram of another embodiment.
[0014]
The high-frequency heating device of the present invention shown in FIG. 2 includes a heating chamber 10 inside, a hinge 11 serving as a pivot for rotation at the lower part of the opening of the heating chamber 10, and a first interlock near the free end. An operation pin A12 for operating the switch 2 and an operation pin B13 for operating the second interlock switch 3 are provided with a door 14 integrally formed. In addition, a printed circuit board 4, a relay 5 and the like are built in the controller 15.
[0015]
The circuit configuration of the high-frequency heating device of the present invention will be described with reference to FIG. The input from the power source 1 is supplied to the inverter 6 from the relay 5 controlled by the printed circuit board 4 by a signal from the first interlock switch 2 and the second interlock switch 3, and becomes a high voltage power source. Radiated to the heating chamber.
[0016]
The monitor switch 8 serves to stop the high-frequency oscillation by turning the fuse 9 OFF when the first interlock switch 2 is short-circuited.
[0017]
Next, the configuration and operation of the present invention will be described with reference to FIG.
[0018]
The door 14 is configured to be rotatable by a door arm 16 for an opening / closing mechanism, a door panel 17 and a roller 18 which are locked to the apparatus main body side.
[0019]
The movement arrow 19 of the operation pin A12 rotates the lever A22 in the direction of the arrow 23 about the fulcrum A21 provided on the switch mounting plate 20 to operate the first interlock switch 2 and the monitor switch 8.
[0020]
The movement arrow 24 of the operation pin B13 rotates the lever B26 in the direction of the arrow 27 around the fulcrum B25 provided on the switch mounting plate 20 to operate the second interlock switch 3.
[0021]
In the present invention, for example, in FIG. 1, the position of the hinge 11 and the operation pin 13 is 200 mm while the position of the hinge 11 and the door arm 16 attached to the door 14 is about 50 mm, and the operation pin corresponding to the movement of the door 14. The movement of B13 can secure four times the movement of the door arm 16.
[0022]
Therefore, in this configuration, the second interlock switch 3 is set to be OFF when the free end portion (upper end portion) of the door 14 is opened by 3 mm.
[0023]
The operation is reversed when the door is opened and closed.
[0024]
In the present invention, when the door 14 is fully opened, the lever B26 is guarded by providing a pin guide 28 that complies with safety standards so that a person cannot easily operate it from the outside.
[0025]
As shown in FIG. 4, the pin guide 28 is provided with a slit 29 of about 2 to 2.5 mm, and the operation pin B <b> 13 transmits the movement to the lever B <b> 26 through the slit 29.
[0026]
One of the pin guides 28 is inserted into the Z-shaped portion 31 of the front plate 30 of the heating chamber 10 and the other is held by the claw shape 32 of the front plate 30, and as shown in FIG. In this structure, the front plate 30 is loosely mounted in the direction of the arrow 33 so that it can follow the position fluctuation.
[0027]
The lever spring 34 is for urging the lever A22 and the lever B26.
[0028]
The operation pin B13 formed integrally with the door 14 has a thin tip of about 2 mm because of the necessity to be inserted into the slit 29 of the pin guide 28. Therefore, in the present invention, as shown in FIG. By making the base reinforced with a triangular shape 35 to about 6 mm, the structure can withstand strong external impacts.
[0029]
Next, the configuration of the lever A22 and lever B26 and the switch mounting plate 20 will be described with reference to FIG. By adopting a configuration in which the switch mounting plate 20A is arranged in the center and the lever A22A and the lever B26A are arranged on both sides, the depth of the product is particularly reduced by about 30%, and a space-saving product is made possible.
[0030]
The operation mechanism of the first interlock switch is the same as that of the present invention and the conventional configuration.
[0031]
【The invention's effect】
By operating the second interlock switch 3 that operates via the pin guide 27 and the lever B26 in response to the operation of the operation pin B13 provided on the door 14, the second interlock switch 3 is immediately disconnected when the door 14 is opened. Therefore, the high-frequency leakage value can be reduced to 5 mw / cm 2 or less, satisfying the IEC standard, and providing a safer high-frequency device.
[0032]
Further, by arranging the lever A22 and the lever B26 on both sides with the switch mounting plate 20 at the center, it is possible to compress the dimensions particularly in the depth direction of the product, and a space-saving product is possible.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a main part of a high-frequency heating device according to an embodiment of the present invention. FIG. 2 is an external perspective view of the high-frequency heating device. FIG. 3 is a circuit diagram of the high-frequency heating device. Fig. 5 is a block diagram of a main part of a high-frequency heating device according to another embodiment of the present invention. Fig. 6 is a block diagram of a main portion of a conventional high-frequency heating device.
2 First interlock switch 3 Second interlock switch 7 High frequency generator (oscillator)
10 Heating chamber 12 Operation pin A
13 Operation pin B
14 Door 20 Switch mounting plate 22 Lever A
26 Lever B
28 Pin guide 30 Front plate

Claims (1)

A heating chamber for storing and heating food, a high frequency generator for supplying high frequency to the heating chamber, an openable / closable door having an operation pin A and an operation pin B facing the opening surface of the heating chamber, and the operation pin In conjunction with the operation of A, a first interlock switch that operates via a lever A mounted on a switch mounting plate located on the side of the heating chamber, and in conjunction with the operation of the operation pin B, the heating chamber A pin guide mounted on the front plate and a second interlock switch that operates via a lever B mounted on the switch mounting plate. The lever A and the lever B are centered on the switch mounting plate. A high-frequency heating device characterized in that it is arranged on both sides .

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