JP2003157963A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency heating device which can efficiently heat foods by microwave even if the kind, volume, or location of the food to be heated are various. SOLUTION: The high frequency heating device comprises a heating chamber 2 housing food 1, a table plate 3 putting the food 1, a driving motor 8 rotating a rotation antenna 4 controlling the heating of the food 1, and a control arithmetic unit 9 controlling the rotation motor 8 or the like. A microwave detecting device 7 detecting incident/reflecting signals of microwave inside a wave guide 6 is mounted on a longitudinal side surface of the wave guide 6, and the incident/reflecting signals of microwave at every rotation angle of the driving motor 8 are fetched into the microwave detecting device 7, and a rotation angle position of the driving motor which makes the reflection coefficient Γ of microwave oven minimum is calculated by the control arithmetic unit 9 depending on the incident/reflecting signals, and the rotation antenna 4 is controlled so as to stop the rotation at the above position by the control arithmetic unit 9.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus for heating food using microwaves. 2. Description of the Related Art In a conventional high-frequency heating apparatus, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-257873, an input current or input power is reduced during one rotation of a food placing rotating body. There has been proposed a method in which a rotating body is stopped at a maximum position, and microwaves are intensively irradiated on food on the rotating body to increase heating efficiency. [0003] In the above prior art,
The rotating body is stopped at a position where the input current or the input power is maximized during one rotation of the food placing rotating body to heat the food. However, when the input current and the input power are the maximum, it cannot be said that the position of the rotating body is always heated to the maximum microwave applied to the food, and the food is not efficiently heated based on the values of the input current and the input power. There was a problem. [0004] In order to solve the above problems, the present invention provides a heating chamber for storing food, a table plate on which food is placed, a rotating antenna for controlling the heating of food, and a micro antenna. A magnetron for generating waves, a waveguide for guiding microwaves oscillating from the magnetron to the heating chamber, a drive motor provided outside the lower part of the waveguide to rotate the rotary antenna, and a drive motor and a magnetron In a high-frequency heating device equipped with a control operation device that controls the operation of the microwave, a microwave detection device that detects microwave incident signals and reflection signals in the waveguide is installed on the long side surface of the waveguide, and the drive motor The microwave incident signal and the reflected signal for each rotation angle are captured by the microwave detection device, and based on the captured signal, The rotational angle position of the drive motor at which the value of the reflection coefficient of the chromatic wave is minimized is determined, and the drive motor is controlled by the control arithmetic unit so that the rotary antenna stops at this position. An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part of a high-frequency heating device.
1 is a food. Reference numeral 2 denotes a heating chamber for heating the food 1.
Reference numeral 3 denotes a table plate, which is located below the heating chamber 2.
And a food 1 to be heated, which is provided to form a space 2a between itself and the bottom surface. Reference numeral 4 denotes a rotating antenna, which is provided in a space 2a between the table plate 3 and the bottom surface of the heating chamber 2 and is rotatable to control the heating of the food 1. A magnetron 5 oscillates microwaves. 6 is a waveguide provided outside the bottom surface of the heating chamber 2,
The microwave generated by the magnetron 5 is guided to the heating chamber 2. Reference numeral 7 denotes a microwave detector installed on the long side surface of the waveguide 6 for detecting operation information of the microwave. Reference numeral 8 denotes a drive motor, which is provided outside the lower part of the waveguide 6 and has a drive shaft penetrating the heating chamber 2 and an opening 2b provided in the waveguide 6, and the rotary antenna 4 is provided at the upper end thereof. It is fixed. The drive motor 8 is, for example, a stepping motor capable of controlling the rotation angle. The opening 2
b is the point where microwaves are sent from the waveguide 6 to the heating chamber 2. Reference numeral 9 denotes a control arithmetic unit which calculates an operation based on operation information of a microwave signal detected by the microwave detection device 7 and controls the operation of the drive motor 5 based on the information obtained by the operation. It is. Next, the operation of this embodiment having the above configuration will be described. When the food 1 is placed on the table plate 3 and heating is started, the magnetron 5 oscillates and reaches the space 2a where the rotary antenna 4 is located from the waveguide 6 via the opening 2b. At the same time as the start of heating, the drive motor 8 also operates, and the rotary antenna 4 rotates. Then, the microwave is diffused by the rotating antenna 7, passes through the table plate 3, and heats the food 1. On the other hand, the microwave detecting device 7 also takes in the microwave incident signal and the reflected signal for each rotation angle of the drive motor 8 at the same time when the heating is started, and transmits the signal to the control operation device 9, where the reflection coefficient Γ is calculated. , The position where the reflection coefficient Γ becomes minimum, for example, the point A in FIG.
It is stored in the control arithmetic unit 9. The position of the rotary antenna 4 when the reflection coefficient Γ is minimized is set so that the efficiency of heating the food 1 is maximized. Then, at a preset time point, the control arithmetic unit 9 controls the drive motor 8 so that the rotary antenna 4 stops at the position of the point A in FIG.
The heating of the food 1 is continued by stopping the rotating antenna 4 and the heating ends when the temperature reaches a preset time or temperature. As described above, the reflection coefficient の of the microwave oscillated from the magnetron 5 is obtained, and the rotating antenna 4 is stopped at the position where the reflection coefficient Γ is minimum, whereby the food 1 is obtained.
Can be efficiently and uniformly heated even if the type or shape of the material changes. As described above, according to the present invention, a heating chamber for storing food, a table plate for mounting the food,
A rotating antenna that controls the heating of food, a magnetron that generates microwaves, a waveguide that guides microwaves oscillating from the magnetron to the heating chamber, and the rotating antenna that is provided outside a lower portion of the waveguide. In a high-frequency heating device equipped with a drive motor for rotating and a control operation device for controlling the operation of the drive motor and the magnetron, a microwave detection device for detecting a microwave incident signal and a reflected signal in the waveguide is used as a waveguide. Installed on the long side of
The microwave incident signal and reflected signal for each rotation angle of the drive motor are captured by the microwave detection device, and the control arithmetic unit controls the rotation angle position of the drive motor at which the value of the microwave reflection coefficient is minimized based on the captured signal. And the control arithmetic unit controls the drive motor to stop the rotating antenna at this position, so that the rotating antenna is stopped at the position of the most optimum rotation angle of the heating efficiency, so that the food to be heated is Even if the type, the amount, and the placement position are different, the heating can be performed efficiently, which has the effect of shortening the heating time and saving energy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part showing one embodiment of a high-frequency heating device of the present invention. FIG. 2 is a diagram illustrating a relationship between a reflection coefficient と き に obtained when the rotating antenna makes one rotation and a rotation angle of the rotating antenna. [Description of Signs] 1 Food 2 Heating chamber 3 Table plate 4 Rotating antenna 5 Magnetron 6 Waveguide 7 Microwave detector 8 Drive motor 9 Control arithmetic unit

Claims (1)

Claims: 1. A heating chamber (2) for storing a food (1),
Table plate (3) on which food (1) is placed, and rotating antenna (4) for controlling heating of food (1)
A magnetron (5) for generating microwaves, a waveguide (6) for guiding microwaves oscillated from the magnetron (5) to the heating chamber (2), and a lower outside of the waveguide (6). A high-frequency heating apparatus provided with a drive motor (8) for rotating the rotary antenna (4) and a control arithmetic unit (9) for controlling the operation of the drive motor (8) and the magnetron (5). A microwave detecting device (7) for detecting an incident signal and a reflected signal of the microwave in the wave tube (6) is installed on a long side surface of the waveguide (6), and each of the rotation angles of the drive motor (8) is changed. A microwave incident signal and a reflected signal are captured by a microwave detection device (7), and a control operation device (9) controls the drive motor (8) to minimize the value of the microwave reflection coefficient (Γ) based on the captured signal. ) Of the rotation angle position High frequency heating apparatus characterized by controlling the drive motor (8) by the control arithmetic unit so that the rotation antenna (4) is stopped at a position (9).