JPS58147988A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention relates to a radiation device or a radio wave stirring device installed in the heating chamber of a high-frequency heating device, which maintains stable original performance even under severe use or long-term use. The present invention provides a radiation device or a radio wave stirring device that obtains the desired results.

Conventionally, in order to improve the distribution characteristics of the high frequency waves supplied into the heating chamber of a high frequency heating device, the high frequency waves radiated into the heating chamber are rotated by an antenna, which is a radio wave stirring device. If the device or antenna is touched by a heated object, or if the container becomes loose when the heated object is taken in or taken out, the radio wave stirring device or antenna will be deformed and the high frequency distribution characteristics will deteriorate. In particular, the radio-wave stirring device, which has a structure in which the high-frequency generator is rotated by cooled cooling air, is constructed of a thin material to make the radio-wave stirring blades lightweight, so it will not be deformed even by some force applied from the outside. Cheap.

Furthermore, in the case of high-frequency heating equipment that uses electric heaters, etc., it is not possible to attach a capture cover to cover the radio stirring blades or antennas because there is no material suitable for heat resistance, and therefore it is difficult to install a capture cover to cover the radio stirring blades or antennas. Even if it is confirmed that satisfactory performance can be obtained, it is still unclear to what extent the original performance is maintained at the stage of actual users. This is because if the high-frequency heating device malfunctions so that it does not work, the user will notice the malfunction and request repairs, but they will not notice the phenomenon where the high-frequency distribution gradually deteriorates and uneven heating occurs. , and were often used without repair.

In addition, in those equipped with a synthetic resin cover that protects the radio wave blades, there is a risk that food particles may adhere to the cover during long-term use of the high-frequency heating device, causing the food particles to burn.

The present invention includes a heating chamber that accommodates an object to be heated, a high frequency generator that supplies high frequency waves into the heating chamber, and a radiation device that radiates the high frequency waves generated by the high frequency generator into the heating chamber or that is supplied into the heating chamber. The present invention includes a stirring device that stirs high frequency waves, and at least a portion of the radiation device or the radio wave stirring device is made of a shape memory alloy, thereby solving the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a main body of a high-frequency heating device, and a heating chamber 3 for accommodating an object to be heated 2 is provided within this main body 1. Reference numeral 4 denotes a high-frequency generator, and the high-frequency waves generated by the high-frequency generator 4 are supplied into the heating chamber 3 from a power supply lower provided on the upper wall 6 of the heating chamber through a waveguide w5. 8 is heating chamber 3
The main parts of the radio stirring blades 9 of the radio stirring device 8 are made of, for example, Cu, Zn manufactured by Digital Memory Metal Company.
.

It is an alloy made of AM, and if this alloy is heat-treated to memorize a desired temperature, when that temperature is reached, the alloy will return to its original shape even if it has been deformed. It is rotatably driven by a motor 10 provided above 3. Reference numeral 11 denotes a door provided at the opening of the heating chamber 3 so as to be openable and closable.

By constructing the main part of the radio-wave stirring blade 8 from a shape memory alloy in this way, it is possible to avoid accidental damage when taking the heated object 2 into and out of the heating chamber 3 or when cleaning the inside of the heating chamber 3, as shown in the figure. Even if the radio-wave stirring blade 9 is deformed, it will naturally return to its original shape once it reaches a predetermined temperature due to the heat of steam generated from the object to be heated 2 during cooking and self-heating of the radio-wave stirring blade 9 due to high frequency waves. Therefore, the normal high frequency distribution characteristics set in the heating chamber 3 can be maintained.

Unlike the conventional method, there is no need to provide a protective cover for the radio-wave stirring blades 9, so the high-frequency heating device is inexpensive and highly safe.

FIG. 2 shows another embodiment, in which a rotating antenna 13 having a horizontal component 12 as an example of a radiating device faces into the heating chamber 3 from the waveguide 6, and a motor provided above the waveguide v5. 10 and is configured to be rotationally driven. This horizontal component 12 is composed of a shape memory alloy.

This rotating antenna 13 has almost no effect of stirring high frequencies like the radio wave stirring blade 9, but when it is deformed as shown in the figure, for example, the distance between the end of the horizontal component 12 and the upper wall 6 of the heating chamber becomes smaller. Since it becomes shorter, it becomes difficult for high frequencies to be radiated from the horizontal component 12, and the effectiveness of the rotating antenna 13 is reduced.

Therefore, if the horizontal component 12 of the rotating antenna 13 is made of a shape memory alloy, even if the horizontal component 12 is erroneously deformed, the horizontal component 12 will not be affected by the heat of the steam generated from the object 2 during cooking or by the high frequency. Since it returns to its original shape by self-heating, it is possible to distribute a scorching high frequency wave within the heating chamber 3.

As is clear from the following explanation, according to the high-frequency heating device of the present invention, even if the radio wave stirring device or the radiation device is deformed for some reason, the heat of the steam generated from the object to be heated during cooking can be maintained. Since the self-heating of the radio-wave stirrer and radiation device caused by high-frequency waves causes the device to naturally return to its original shape, the distribution characteristics of the high-frequency waves within the heating chamber are improved, making it possible to cook the object evenly.

Furthermore, there is no need for a protective cover to protect the radio wave stirring device or radiation device, making it possible to provide a high-frequency heating device that is inexpensive and highly safe.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1a is a side sectional view of a high-frequency heating device showing an embodiment of the present invention, and FIG.
FIG. 2a is a side cross-sectional view of a high-frequency heating device showing another embodiment of the present invention, and the same figure is a side view showing a main part of the radiation device. 3... Heating chamber, 4... High frequency generator, 8... Radio stirring device, 13... Rotating antenna (radiating device).

Claims (1)

[Claims] A heating chamber that accommodates an object to be heated, a high-frequency generator that supplies high-frequency waves into the heating chamber, and a radiation device that radiates the high-frequency waves generated by the high-frequency generator into the heating chamber or stirs the high-frequency waves supplied into the heating chamber. A high-frequency heating device comprising a radio wave stirring device, at least a part of which is made of a shape memory alloy.