JPH07155253A - High frequency heater - Google Patents

Abstract

PURPOSE:To provide delicious cooked rice quickly by cooking rice by a heating system using a surface wave exciting body. CONSTITUTION:High frequency from an oscillation source 2 for oscillating high frequency is propagated by a surface wave and the absorption of water by rice is promoted by an exciting body for heating an object to be heated. An adjusting means 12 to supply a high frequency power to the maximum and detection means 10 and 11 to detect the temperature of the object 4 to be heated are installed with such an arrangement, the concentration of an electric field on the object 4 to be heated is controlled to accelerate a rise in the temperature of rice and water thereby enabling the cooking of delicious rice quickly with the promotion of gelatinization of the rice.

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 cooking rice.

[0002]

2. Description of the Related Art As a rice cooking method for heating by a heating method other than the conventional high-frequency heating, there is an electric heater or an induction heating method (induction heating) for heating a rice cooking vessel to cook rice. Further, as a rice cooking method using high frequency heating, there are Japanese Utility Model Laid-Open No. 2-116208 and Japanese Patent Laid-Open No. 5-44943.

[0003]

However, in the above-described conventional configuration, in response to the desire to eat various kinds of rice deliciously and quickly, the electric heater and the induction heating method can improve the efficiency of water absorption time of rice. There was the first problem that there was a limit.

Further, in the rice cooking method using the high frequency heating method, the size of the apparatus increases due to the high frequency oscillating source or the high frequency wave circulated by the waveguide, and the waveguide opening from below as in JP-A-5-44943. Even if the power is supplied by, the electric wave shielding structure of the lid that opens and closes is very troublesome. Further, the conventional rice cooker has a second problem that the rice cooked amount cannot be detected in the early stage of rice cooked because the rice cooked amount is detected by detecting the temperature rise of the heating means by the detecting means.

The present invention is intended to solve the above problems, and has as its first object to realize a high-frequency heating apparatus capable of cooking delicious rice in which high-frequency power is supplied to the maximum by a high-frequency heating method. A second object of the present invention is to provide a high-frequency heating device that is easy to use and uses a high-frequency heating method.

[0006]

In order to achieve the first object of the present invention, a removable rice cooking container, an oscillation source that oscillates a high frequency, and an exciter that propagates the high frequency and heats the rice cooking container. , A waveguide that guides a high frequency wave to the exciter, a heating unit that heats the rice cooking container, at least one detection unit that detects the temperature of the rice cooking container, and the maximum power to the object to be heated in the waveguide. It is configured to include an adjusting unit for adjusting so as to enter, a driving unit for automatically driving the adjusting unit, and a control unit for controlling the oscillation source, the heating unit, and the driving unit based on the signal of the detecting unit.

In order to achieve the above second object,
A removable rice cooking container, an oscillation source that oscillates a high frequency, an exciter that propagates a high frequency to heat the rice cooking container, a waveguide that guides the high frequency to the exciter, and a heating unit that heats the rice cooking container,
At least one or more detecting means for detecting the temperature of the rice cooking container, a rice cooking amount detecting means for detecting the amount of rice cooked in the rice cooking container, and an adjustment for adjusting the maximum power to the object to be heated in the waveguide. Means, a driving means for automatically driving the adjusting means, and a control means for controlling the oscillation source, the heating means, and the driving means based on the signals of the detecting means and the cooked rice amount detecting means.

[0008]

According to the present invention, the adjusting means, the driving means, the detecting means, and the controlling means having the above-mentioned first structure automatically adjust the maximum power of the oscillation source so that it is inputted to the object to be heated by the exciter, and the high frequency is used. It can accelerate the water absorption of rice and raise the temperature to gelatinize in a short time. Further, according to the present invention, the amount of cooked rice can be known at the initial stage of cooking rice and the cooking time can be known by the cooked rice amount detecting means having the second configuration.

[0009]

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

(Embodiment 1) In FIG. 1, 1 is a rice cooking vessel, 2 is a magnetron which is a high frequency oscillation source, 3 is a power source for supplying to the magnetron, 4 is rice and water which are objects to be heated, 5
Is an exciter for heating high frequency waves into a surface wave, 6 is a waveguide for transmitting high frequency power from the magnetron 2, 7 is an antenna for exciting the exciter 5 with high frequency power from the magnetron 2, and 8 is an object to be heated. Is a heating means for heating and maintaining the temperature of the magnetron, 9 is a cooling fan for cooling the magnetron 2, 10 and 11 are temperature sensors for detecting the temperature of the object to be heated, 12 is high frequency power for the object to be heated 4. Is a stub tuner which is an adjusting means for adjusting so as to be maximum, 13 is a driving means for slidingly driving the adjusting means 12,
Reference numeral 14 is a lid for taking in and out the object to be heated, and 16 is a detecting means 1.
In response to signals 0 and 11, magnetron 2 and driving means 1
3 is a control means for controlling 3 or the like.

The rice cooking container 1 is made of a material that transmits high frequencies, and the control means 16 receives signals from the temperature sensors 10 and 11 from
A stub tuner 1 that drives the driving means 13 and is an adjusting means.
By making 2 slidable, matching can be adjusted according to the amount of cooked rice. In other words, the tuner 12 can be moved according to the amount of cooked rice so that the maximum high frequency power is always supplied.

The reason for using the adjusting means 12 is that the maximum high-frequency output of 600 W can be adjusted even for one object to be heated 4 having a small amount of cooked rice. In the past, the stub tuner 12 was fixed to a place where the amount of cooked rice was large.
Only about 00 W was input to the article to be heated 4.

Further, the surface wave heating utilizes total reflection of high frequency radio waves, and by constructing the exciter 5 having a shape as shown in FIG. 1, high frequencies can be concentrated on the tip of the exciter. As a characteristic of surface wave heating, the electric field at the tip in the vicinity of the exciter is extremely strong as shown in FIG. 2, and the electric field strength exponentially decreases in the Z direction. Further, the high frequency propagates through the tip of the exciter 5 as shown in FIG.

An exciter having a shape as shown in FIG. 1 is constructed around the bottom portion of the rice cooking container 1, and the high frequency propagated through the waveguide 6 around the rice cooking container 1 is heated by the exciter 5 to generate high frequency. The rice in the rice cooking container is cooked. And the control means 1
6 determines the amount of rice in the rice cooking container based on the temperature rise of the detection means 10 and 11, and uses the high frequency and the heating means 8 to create an optimum heating pattern to cook rice. In the case of rice cooking by high frequency heating, water absorption is promoted by internal heating in the initial water absorption process to speed up the rice cooking. In addition, since the heating method causes electric field concentration by surface waves, the energy efficiency is high, and heating to rice and water is efficiently performed, so that the gelatinization of rice, which is an index of deliciousness, can be promoted.

(Embodiment 2) In FIG. 3, 1 is a rice cooking container, 2 is a magnetron which is a high frequency oscillation source, 3 is a power source for supplying to the magnetron, 4 is rice and water which are objects to be heated, 5
Is an exciter for heating high frequency waves into a surface wave, 6 is a waveguide for transmitting high frequency power from the magnetron 2, 7 is an antenna for exciting the exciter 5 with high frequency power from the magnetron 2, and 8 is an object to be heated. Is a heating means for heating and maintaining the temperature of the magnetron, 9 is a cooling fan for cooling the magnetron 2, 10 and 11 are temperature sensors for detecting the temperature of the object to be heated, 12 is high frequency power for the object to be heated 4. Is a stub tuner which is an adjusting means for adjusting so as to be maximum, 13 is a driving means for slidingly driving the adjusting means 12,
14 is a lid for putting in and taking out the object to be heated, and 15 is a rice cooking container 1.
The rice cooking amount detecting means 16 for detecting the amount of rice cooking inside, 16 receives signals from the detecting means 10, 11 and the rice cooking amount detecting means 15,
It is a control unit that controls the magnetron 2, the driving unit 13, and the like.

In FIG. 3, the rice cooking container 1 is made of a material that transmits high frequencies, and the control means 16 is the temperature sensors 10 and 1.
1. From the signal of the cooked rice amount detecting means 15, by driving the driving means 13 and making the stub tuner 12 as the adjusting means slidable, the matching can be adjusted according to the cooked rice amount. In other words, the tuner 12 can be moved according to the amount of cooked rice so that the maximum high-frequency power is always supplied.

The reason for using the adjusting means 12 is the same as that described in the first embodiment, and the heating principle utilizing surface waves is the same as that in the first embodiment.

As the cooked rice amount detecting means 15, a high frequency sensor for detecting the amount of high frequency power absorbed by the object 4 to be heated is used. According to this principle, when the amount of cooked rice is large, the high frequency absorbs a large amount, and as a result, the power of the high frequency detected by the detection unit 15 decreases. On the contrary, when the amount of cooked rice is small, the amount of high frequencies absorbed is small, and as a result, the power of the high frequencies detected by the detection unit 15 increases. Therefore, the relationship between the high frequency power by the detection means 15 and the amount of cooked rice is inversely proportional.

Based on this result, the control means 16 can detect the amount of cooked rice from the amount of high frequency absorption at the initial stage to inform the user of the optimal cooked time, and the detecting means 10, 1
By combining the signal of the temperature rise of No. 1, the optimum rice cooking pattern can be created by using the high frequency and the heating means 8 and the rice can be cooked.

The characteristics of the high frequency rice cooking in this embodiment are as follows:
The description is omitted because it is the same as.

[0021]

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

(1) It is possible to provide a high-frequency heating device that promotes absorption of water into an object to be heated by high-frequency heating and that can realize optimum and delicious rice by the detection means.

(2) The high frequency heating promotes water absorption to the object to be heated, and the rice cooking amount detection means can immediately inform the user of the rice cooking time at an early stage, and the detection means can realize optimum delicious rice. An easy-to-use high-frequency heating device can be provided.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating an electric field on the surface of an exciter according to an embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a high-frequency heating device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Rice Cooking Container 2 (High Frequency) Oscillation Source 5 Exciter 6 Waveguide 8 Heating Means 10, 11 Detecting Means 12 Adjusting Means 13 Driving Means 15 Rice Cooking Amount Detecting Means 16 Control Means

Claims (2)

[Claims] 1. A removable rice cooking container, an oscillation source that oscillates a high frequency, an exciting body that propagates the high frequency and heats the rice cooking container, a waveguide that guides the high frequency to the exciting body, and the rice cooking. Heating means for heating the container, at least one or more detecting means for detecting the temperature of the rice cooking container, adjusting means for adjusting the maximum power to the object to be heated in the waveguide, and the adjusting A high-frequency heating apparatus comprising: a driving unit that automatically drives the unit; and a control unit that controls the oscillation source, the heating unit, and the driving unit based on a signal from the detection unit. 2. A removable rice cooking container, an oscillation source that oscillates a high frequency, an excitation body that propagates the high frequency and heats the rice cooking container, a waveguide that guides the high frequency to the excitation body, and the rice cooking. Heating means for heating the container, at least one or more detection means for detecting the temperature of the rice cooking container, rice amount detecting means for detecting the amount of rice cooking in the rice cooking container, and heating in the waveguide. Adjusting means for adjusting the maximum electric power to the object, driving means for automatically driving the adjusting means, the detecting means, the oscillating source based on the signals of the rice cooking amount detecting means, the heating means, the A high-frequency heating device comprising: a control unit that controls a driving unit.