JPH05144566A - High frequency heating device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a high-frequency heating device,
An object of the present invention is to provide a high-frequency heating device that automatically performs a heating method that uniformly heats food regardless of temperature, weight, and shape and does not cause uneven heating. [Structure] High frequency oscillation source 2 for oscillating high frequency and food 4
A heating chamber 1 for heating the same, a waveguide 5 for guiding the high frequency wave radiated from the high frequency oscillation source 2 to the heating chamber 1, and radiating the high frequency wave from a plurality of radiation ports 6, and a radiation port 6 of the waveguide 5. Switching means 13 for switching between, the plurality of detection means 9, 10, 11 for detecting the shape, weight, dielectric constant, etc. of the food 4 in the heating chamber 1, and the detection means 9, 10, 11 The switching means 13, the heating time, the heating pattern, and the control means 14 for controlling the high frequency oscillation source 2 are provided. With this configuration, the above object can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device for heating food.

[0002]

2. Description of the Related Art A conventional high-frequency heating apparatus heats a food 4 by radiating a high frequency from a high-frequency oscillation source 2 in a closed space in which the entire heating chamber 1 is surrounded by metal as shown in FIG. There is. Therefore, the food 4 is heated in the heating chamber 1 by the standing wave 18 generated by the wall of the heating chamber. Further, the turntable 15 is provided in order to improve the heating distribution of the food 4 in the heating chamber. In this way, the food 4 was heated from the inside by high frequency heating.
Reference numeral 3 is a power supply for supplying electric power to the high frequency oscillation source, and 7 is a cooling fan for cooling the high frequency oscillation source 2.

[0003]

However, the above-mentioned FIG.
In the conventional configuration of (1), there is one high-frequency radiation port to the heating chamber for heating the food 1, and the heating chamber has only a certain standing wave mode. Therefore, in the belly part of the standing wave,
There is a problem that the electric field is concentrated and the food 4 is unevenly heated. Even if the turntable 14 is provided to reduce such uneven heating, the center of the food 4 may still be heated strongly depending on how the food 4 is placed, and a fundamental solution has not been achieved.

Further, it has not been possible to automatically control what kind of standing wave mode should be used for heating, depending on the way the food is placed and the dielectric constant that changes depending on the type, shape, weight and temperature of the food.

The present invention solves the above-mentioned problems and provides a high-frequency heating device for automatically heating a whole food product without heating unevenness.

[0006]

In order to achieve the above object, the present invention provides a high-frequency oscillation source that oscillates a high-frequency wave, a heating chamber that heats food, etc., and a high-frequency wave radiated from the high-frequency oscillation source. A waveguide for guiding to the chamber and radiating from a plurality of radiation ports, a switching means for switching the radiation ports of the waveguide, and a plurality of detections for detecting the shape, weight, dielectric constant, etc. of the food in the heating chamber. And a control means for controlling the switching means, the heating time, the heating pattern, and the high frequency oscillation source according to the signal of the detection means.

[0007]

According to the present invention having the above structure, the detecting means detects the shape, weight and permittivity of the food in the heating chamber, and the control means switches the radiation port of the waveguide so as to establish the optimum heating mode for heating. Together with heating time, heating pattern,
Also, since the high frequency oscillation source is controlled, the food has a uniform temperature distribution.

[0008]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is an overall configuration diagram of an embodiment of the present invention. In FIG. 1, 1 is a heating chamber, 2 is a magnetron which is a high frequency oscillation source, 3 is a power supply for supplying power to the high frequency oscillation source, 4 is food, 5 is a waveguide for guiding the high frequency of the magnetron 2, and 6 is high frequency radiation. A plurality of radiation ports, 7 a cooling fan for cooling the magnetron 2, 8 a slit provided in the heating chamber for extracting radio waves, 9 a temperature state due to the dielectric constant of the food in the heating chamber 1 depending on the amount of radio waves detected through the slits Detecting means for detecting the weight of the food 4, weight detecting means for detecting the weight of the food 4, shape detecting means for detecting the thickness and other shapes of the food 4, 12 a shield opening for cutting off radio waves emitted from the emission port, 13 Is a switching means, and 14 is a control means for switching based on the signal of each detecting means and controlling the heating time, the heating pattern, and the electric power of the magnetron 2. Reference numeral 15 is a turntable provided in the heating chamber on which food is placed.

FIG. 2 is a structural diagram of the detecting means 9 according to the embodiment of the present invention. In order to detect the temperature state of the food 4 in the heating chamber 1, a minute radio wave detected from the heating chamber through the slit 8 is detected. As a means for detecting, the radio wave detected by the antenna 16 is a high-speed low-noise Schottky It is converted into a DC voltage by the barrier diode 17. The converted voltage is sent to the control means 14.

FIG. 3 is an explanatory view for explaining that the detecting means 9 of the embodiment of the present invention detects a temperature state. When food 4 is placed in heating chamber 1 and is irradiated with a radio wave from magnetron 2, food 4 absorbs the radio wave and rises in temperature. Food has a characteristic that its dielectric constant changes depending on its temperature. That is, when the food is below the freezing point, the dielectric loss of the food is small and the radio waves are hardly absorbed by the food. Also, below the freezing point, the loss is large, and the radio waves are absorbed by the food. Therefore, the temperature information of the food can be obtained by looking at the rate of change of the signal of the detecting means 9 from the start of heating. In the figure, white circles indicate frozen products and black circles indicate semi-thawed products. It can be seen that the rate of change of the signal of the detecting means 9 varies depending on the elapsed time of radio wave irradiation.

Further, the weight of the food is detected by the weight detecting means 10 provided under the turntable 15 (for example, it is detected by the capacitance change due to the weight of the food by a condenser type).
The shape of the food is detected by the shape detecting means 11 (for example, scanning by ultrasonic wave transmission or measurement of light reflection) for detecting the shape of the food, and is input to the control means 14. With these, even if the weight is the same, the switching means 13 controls the shield opening 12 so as to prevent uneven heating distribution due to the difference in shape, and adjusts so that the radio waves are effectively absorbed by the food.

For example, when the food is a frozen food, has a small weight, and has a flat shape, the electric wave is hardly absorbed at first, so that the signal change of the detecting means 9 is large and the heating time is shortened by the weight detecting means. The shape detecting means controls the switching means 13 so that the switching means 13 is frequently switched at appropriate time intervals so as to prevent uneven heating.

The detecting means 9 is not limited to one location, but may be detected by a plurality of slits provided in the waveguide or in the heating chamber wall, and is limited to one embodiment of the present invention. Not a thing.

[0015]

As described above, the high frequency heating apparatus of the present invention has the following effects.

Multiple detection means (temperature condition, weight, shape)
By grasping the heating state of the food placed in the heating chamber, the method, the optimum heating time, heating pattern for heating the food,
Since the radiation port of the waveguide that radiates to the heating chamber is switched to set to the standing wave mode, the radio waves are effectively radiated to the food, so uneven heating can be suppressed regardless of the temperature and shape of the food. it can.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a high frequency heating apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a detection unit according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating characteristics of the detecting means according to the embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a conventional high-frequency heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 2 High frequency oscillation source 4 Food 5 Waveguide 6 Radiation port 9 Detection means 10 Weight detection means 11 Shape detection means 13 Switching means 14 Control means

Claims (1)

[Claims] 1. A high frequency oscillating source for oscillating a high frequency, a heating chamber for heating foods, etc., and a waveguide for guiding the high frequency radiated from the high frequency oscillating source to the heating chamber and radiating it from a plurality of radiation ports. A switching means for switching the radiation port of the waveguide, at least one or more detecting means for detecting the shape, weight, dielectric constant, etc. of the food in the heating chamber, and the switching means according to a signal from the detecting means. , Heating time,
A high frequency heating device comprising a heating pattern and a control means for controlling a high frequency oscillation source.