JPS583170B2 - 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.The conventional configuration of such high-frequency heating devices is to directly or waveguide radio waves emitted from a radio wave source such as a magnetron. It has a structure in which it is supplied through a tube to the inside of a cavity called an oven in which the object to be heated is stored.

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 initial 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.

Therefore, the present invention does not depend on the type, weight, or initial temperature of the object to be heated.
Furthermore, it is an object of the present invention to provide heating control means for a heated object that does not cause deformation of the heated object.

More specifically, the method detects the physical change in the airflow 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 heated object 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 the rotation receiver 10 is transmitted to the rotation axis o-o.
It is configured to rotate 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 .

There are a plurality of intake openings 15 as shown in FIG. 3, and the wind introduced into the cavity 3 is divided into each intake opening 15.

The position, size, shape, etc. of the intake opening need to be appropriately selected depending on the structure, size, shape, etc. of the cavity 3.
It is desirable that they be arranged at least immediately with respect to the base axis X-X' in the width or depth direction of the cavity 3, which is orthogonal to the rotation axis o-o' of the rotary receiving tray 10.

Moreover, if possible, it is preferable to distribute the parts approximately symmetrically with respect to the base axis xx'.

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

The wind leaving the cavity 3 passes through the exhaust opening 16 and enters 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 for detecting physical changes in the 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 rotary 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 stage 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, it is not necessary to adjust the heating time, so that the heating of the object to be heated can be controlled to a desired temperature regardless of the type, weight, or initial temperature of the object 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. It is.

The third characteristic is the uniqueness of the wind path.

That is, as described above, a plurality of intake openings 15 are provided.

As a result, the heating progress of the object placed on the rotary tray 10 and rotating can be detected by the wind introduced into the cavity 3 along various routes, and reliable control can be achieved. will be able to do it.

To further improve this certainty, the above-mentioned key axis X-X
By distributing the intake openings 15 with respect to ', or even distributing them approximately symmetrically, the distribution of airflow within the cavity can be made uniform and an improvement can be achieved.

As described above, according to the present invention, it is possible to control the heating of an object to be heated without causing the object to be heated to deform, regardless of the type of the object to be heated, its initial weight or initial temperature, and the means for doing so can be reliably configured. A high frequency heating device can be provided.

In addition, in the embodiment, a configuration was 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 explanation of the drawing]

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)

[Scope of Claims] 1 It has a cavity 3 for storing the object to be heated, and the cavity 3 has a rotary tray 10 that rotates while placing the object to be heated, and furthermore, the cavity 3 has an air flow. It has an intake opening 15 and an exhaust opening 16 that communicate with each other, and is equipped with a detection element 18 for detecting physical changes in airflow near the exhaust opening 16, and also has a plurality of intake openings 15. High frequency heating equipment. 2. In claim 1, the intake opening 15
This is a high-frequency heating device characterized in that the cavity 30 is arranged in a widthwise or depthwise basic axis X-, which is perpendicular to the rotational axis of the rotating saucer 10. 3. The high-frequency heating device according to claim 2, wherein the intake opening 15 is distributed approximately symmetrically with respect to the base axis X-y of the cavity 3.