JPS5821180B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high frequency heating device for heating an object using radio wave energy, and more particularly to a means for controlling the heating of the object to be heated by the device.

It is well known that radio energy in the microwave band is used to heat objects.

A common configuration of such high-frequency heating devices is a configuration in which radio waves emitted from a radio wave generation source such as a magnetron are supplied directly or through a waveguide to the inside of a cavity called an open cavity in which the object to be heated is housed. belongs to.

In the apparatus having such a configuration, the heating time of the object to be heated is usually controlled by a timer such as a timer.

In this case, it is necessary to adjust the heating time appropriately depending on the type of the object to be heated, that is, the difference in dielectric loss coefficient, the weight, and the rice temperature, that is, the temperature of the object to be heated before heating.

If the time adjustment is inappropriate, the result will be that the object to be heated is under-heated or over-heated.

Conventionally, as a solution to this problem, a temperature sensing element is inserted into the object to be heated, the temperature of the object to be heated is directly detected, and the oscillation of the magnetron is controlled to control the heating of the object to be heated. methods are being used.

In the device having such a means, the object to be heated loses its shape,
This may cause damage by interfering with cooking.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a heating control means for a heated object that does not depend on the type, weight, or rice temperature of the heated object and does not cause deformation of the heated object.

More specifically, the method detects the physical change in the air flow passing through the cavity, controls the radio wave generation source using the signal, and controls the heating of the object to be heated. The aim of the present invention is to reliably configure the following.

Examples will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is the main body of the device, and 2 is a door attached to the main body 1 so as to be openable and closable.

The main body 1 has a cavity 3 as shown in FIG. 2, and a door 2 is disposed to close an entrance/exit (not shown) of the cavity 3 for the object to be heated.

In FIG. 2, 4 is a magnetron which is a radio wave generation source.

This is a blower for cooling the magnetron 4, and the blower 5 is surrounded by an air guide 7, and the air guide 7 is provided with a blower intake port 6.

8 is an exhaust air guide for cooling the magnetron 4, and 9 is an antenna cover 9 surrounding the antenna section of the magnetron 4.

The antenna cover 9 is made of a dielectric material with low loss at high frequencies.

10 is a rotating saucer, and the object to be heated 1 is placed in the rotating saucer 10.
3 is placed, and the rotating saucer drive motor 11 is used as a drive source,
The coupling piece 12 connects the rotary saucer drive motor 11
The driving force of 0-0 is transmitted, and the rotating tray 10
It is configured to perform rotational movement around ′.

14 is an intake duct, and 15 is an intake opening formed in the cavity 3.

The wind entering the cavity 3 is introduced into the cavity 3 via the intake duct 14 and through the intake opening 15 .

16 is an exhaust opening formed in the cavity 3, and 17 is an exhaust duct.

The intake openings 15 are arranged non-linearly.

That is, as shown in FIG. 3, they are arranged in an arc shape along the peripheral edge of the rotary receiving tray 10.

The wind leaving the cavity 3 passes through the exhaust opening 16 to the exhaust duct 1
It is exhausted through 7.

One end of the exhaust duct 17 is disposed near the blower intake port 6 so that the intake force of the blower 5 acts on the exhaust duct 17.

Reference numeral 18 denotes a detection element that detects physical changes in wind, that is, airflow, and in this embodiment, an element such as a thermistor that is sensitive to temperature changes in the airflow is used.

19 is an amplification means for amplifying the signal of the detection element 18;
20 is operated by the output generated from the amplification means 19;
This is a control means for controlling the oscillation of the magnetron 4.

Next, the operation of the above embodiment and the effects of each part will be explained.

Radio waves generated by the magnetron 4 are radiated into the cavity 3 and heat the object 13 to be heated.

The object to be heated 13 rotates together with the rotating tray 10 and is uniformly heated.

As the heating of the object to be heated 13 progresses, the object to be heated 13
The radiant heat radiated from increases.

This heat is transferred to the sensing element 18 by the wind passing through the cavity 3.

The detection element 18 generates a signal in response to a change in the radiant heat of the object 13 to be heated.

The signal generated from the sensing element 18 is amplified by the amplification means 19 and transmitted to the control means 20.

Therefore, when the object to be heated reaches a desired temperature, the control means 20 is activated, the oscillation of the magnetron 4 is controlled, and the heating of the object to be heated is controlled.

The present embodiment operates as described above.

Incidentally, the first feature of this embodiment is that the heating of the object to be heated is not controlled by a timer.

Therefore, since it is not necessary to adjust the heating time, it becomes possible to control the heating of the object to be heated to a desired temperature regardless of the type, weight, and temperature of the rice to be heated.

The second feature is that it is a so-called indirect detection method that detects temperature changes of the heated object without directly inserting the sensing element 18 into the heated object, so the heated object does not lose its shape. .

The third characteristic is the uniqueness of the wind path.

That is, the intake opening 15 is arranged non-linearly.

Although it is preferable to select the shape and size appropriately depending on the structure of the cavity 3, basically the rotating saucer 100
It is desirable to provide it along the periphery or to form it in an arc shape.

In such a case, even if the object to be heated is placed at any position in the cavity by the rotation of the rotary receiving tray 10, the progress of heating of the object can be reliably captured by the airflow.

Therefore, the heating of the object to be heated can be reliably controlled.

As described above, according to the present invention, the heating of the object to be heated can be controlled without deforming the object regardless of the type, weight, or rice temperature of the object to be heated, and the means for doing so can be reliably configured. It is possible to provide a high-frequency heating device that can.

In addition, in the embodiment, a configuration is presented in which the oscillation of the magnetron is controlled by capturing the temperature change of the airflow passing through the cavity, but the configuration is not necessarily limited to such a configuration.
For example, the idea of the present invention can also be applied to a structure in which the heating of the object to be heated is controlled by controlling the oscillation of a magnetron using other physical changes such as changes in the humidity of airflow due to water vapor generated from the object to be heated. Needless to say, it can be done.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view of a high-frequency heating device according to the present invention.
FIG. 2 is a schematic vertical cross-sectional view of the main part, and FIG. 3 is a cross-sectional view of the main part. 3... Cavity, 10... Rotating saucer, 15... Intake opening, 16... Exhaust opening, 18... Detection element.

Claims (1)

[Claims] 1 It has a cavity 3 for storing the object to be heated, the cavity 3 has a rotary tray 10 which rotates with the object to be heated placed thereon, and the cavity 3 further has an intake opening 15 through which the airflow flows; It has an exhaust opening 16, and is provided with a detection element 18 for detecting physical changes in airflow near the exhaust opening 16. 1. A high-frequency heating device, characterized in that the high-frequency heating device is provided at a location where an airflow is formed toward a surface of a rotating saucer on which an object to be heated is placed.