JPS6335076B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device that combines high frequency heating of 3 to 30 MHz, a sheathed heater, and a nichrome heater heating device.

When thawing frozen foods or frozen foods using a heating cooker such as an oven or toaster oven equipped with a heater heating device that heats with a conventional sheathed heater or nichrome heater, The surface of the food thawed faster than the inside, and when the inside was completely thawed, the surface became dry, discolored, and boiled, making it unsuitable for thawing.
Furthermore, even when thawing with a 2450 MHz microwave heating device like that found in microwave ovens, the penetration depth of radio waves is shallow, and if you try to completely thaw the inside of the object, the surface temperature will rise locally. occurred, making it unsuitable for thawing.

The present invention eliminates the conventional drawbacks and uses a high-frequency heating device that performs dielectric heating at a short wave band frequency of 3 to 30 MHz when defrosting or reheating, and uses a sheathed heater or nichrome heater when baking bread, grilling fish, stews, etc. The purpose is to realize a cooking device that performs heating using a heater heating device such as the above.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In Figures 1 and 2, the housing 1
An oven cavity 2 is installed inside the oven cavity 2, and inside the oven cavity 2, an upper heating electrode 3 and a lower heating electrode 4 of a high frequency heating device are arranged. The upper heating electrode 3 is movable up and down. A cover 5 which is an insulator and has low high frequency loss and high heat resistance is provided below the upper heating electrode 3. A mounting plate 6 made of an insulating material with low high frequency loss and high heat resistance is disposed above the lower heating electrode 4. 7 is the upper heating electrode 3;
This is a high frequency oscillation section that supplies high frequency power to the heating electrode 4 at the bottom.

Reference numeral 8 denotes a heater consisting of a sheathed heater, a nichrome heater, etc., which is integrally installed above the upper heating electrode 3 and moves together with the upper heating electrode 3. A wire mesh 9 on which it is placed is provided. 8' is a heater provided in the upper part of the cavity 2. The heaters 8 and 8' constitute a heater heating device. Reference numeral 10 denotes a switching device that stops the operation of the high-frequency heating device and enables the operation of the heater heating device only when the upper heating electrode 3 is moved to the lower part.

FIG. 1 shows a state in which a high-frequency heating device is operated to perform cooking, such as thawing cooking or reheating cooking. The upper heating electrode 3 is movable so that the object to be heated placed on the mounting plate 6 is sandwiched between the upper heating electrode 3 and the lower heating electrode 4.
Cook by adjusting the ingredients in an appropriate manner.

FIG. 2 shows a state in which the heater heating device is operated when cooking such as bread baking, fish frying, and stewing. That is, the upper heating electrode 3 is moved to the lower part, and the heater heating device is operated by the operation of the switching device 10.

Referring to FIG. 3, the circuit will be explained. An AC voltage is applied from a low frequency AC power supply 11 to a heater heating device 12 or a high frequency heating device 13 via a switching device 10 . The heater heating device 12 includes a heater 8 including a sheathed heater, a nichrome heater, etc.
8', and changeover switches 8a and 8b for selecting the respective heaters 8 and 8' are provided.

The high-frequency heating device 13 is configured such that a low-frequency AC voltage is converted into a DC voltage by a rectifier circuit 14, and a high-frequency oscillator 15 supplies high-frequency power to the upper heating electrode 3 and the lower heating electrode 4. The high frequency oscillator 15 is composed of a resonant coil, a capacitor, a transistor, a resistor, and the like.

In the switching device 10, a limit switch 17 is connected in series with the excitation coil 16, and when the limit switch 17 is closed, the heater heating device 12 is operated.
When the limit switch 17 opens, the high frequency heating device 1
3 is now working.

Next, the operation of the present invention will be described. When defrosting, the object to be heated is placed between the upper heating electrode 3 and the lower heating electrode 4.
Then, the high-frequency heating device 13 is operated in a sandwiching manner. A 3-30 MHz high frequency electric field is applied to the object to be heated. At low frequencies in the shortwave band, the radio waves penetrate deep and heat the object evenly inside and on its surface, making it possible to thaw the object without causing it to become partially burnt or discolored. Dielectric heating is also used to reheat alcoholic beverages, rice, etc. in the same way.

On the other hand, when cooking such as baking bread, grilling fish, stew, etc., the operation of the high-frequency heating device 13 is cut off by moving the upper heating electrode 3 to the lower part.
The heater heating device 12 is put into operation. The object to be heated is placed on the wire mesh 9, and the heater heating device 12 is operated to perform heating cooking.

As described above, the present invention provides a composite product that incorporates a high-frequency heating device and a heater heating device into one housing, and the high-frequency heating device is used for thawing or reheating frozen products and frozen foods. The heater heating device is used for cooking such as baking bread, grilling fish, and stewing. When the heating electrode at the top of the high-frequency heating device moves to the bottom, the switching device operates and switches to the heater heating device, making the switching operation very easy and allowing heater heating to be performed during high-frequency heating. Alternatively, it is possible to prevent malfunctions such as high frequency heating when heating the heater.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views showing the structure of a cooking device according to an embodiment of the present invention, and FIG. 3 is a circuit diagram of the cooking device. 3... Upper heating electrode, 4... Lower heating electrode, 8, 8'... Heater, 10... Switching device, 1
2... Heater heating device, 13... High frequency heating device.

Claims (1)

[Claims] 1. A high-frequency heating device that applies a high-frequency voltage between a pair of heating electrodes and performs dielectric heating using a high-frequency electric field;
It is equipped with a heater heating device that heats with a sheathed heater, a nichrome heater, etc., and a switching device that switches the operation of the high frequency heating device and the heater heating device, and the heating electrode is configured such that the upper heating electrode is movable. A cooking device in which the switching device operates the heater heating device when the heater moves to the lower part. 2. The heater heating device is composed of a plurality of heaters, and a part of the heater is integrally installed above the upper heating electrode, and when the upper heating electrode is lowered, the lower heater of the heater heating device is configured. A heating cooker according to claim 1.