JPS5930965B2 - 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 an 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 to emit radio waves from a radio wave generation source such as a magnetron, and supply the radio waves directly or through a waveguide to the inside of a cavity called an open cavity in which the object to be heated is housed. It is configured to do this.

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.

Therefore, the present invention aims to provide a means for controlling the heating of the object to be heated, which does not cause any deviation, regardless of the type, weight, or temperature of the rice to be heated.

More specifically, it is desired to detect a physical change in the air flow passing through the cavity and control a radio wave generation source using the signal to control the heating of the object to be heated, and to reliably configure such a means. The aim of the present invention is % Ji.

Embodiments 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 FIGS. 2 and 3, 4 is a magnetron that is a radio wave generation source.

Reference numeral 5 denotes a blower for cooling the magnetron 4. 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 that surrounds 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 rotating plate and the drive motor 1 are connected by the compling piece 12.
1 is transmitted, and the rotation receiving tray 10 is rotated along the rotation axis 0-
It is configured to rotate with 0' as the center of rotation.

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 .

Reference numeral 16 denotes an exhaust opening formed in the cavity 3, and the exhaust opening is constituted by a metal vibrator 21 in order to prevent harmful radio waves.

17 is an exhaust duct.

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 1T 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;
Reference numeral 20 denotes a control means which is operated by the output generated by the amplification means 19 and controls the oscillation of the magnetron 4.

A control valve 22 is a means for adjusting the flow rate of the airflow passing through the sensing element 18. The control valve 22 is operated by a valve driving section 23, and adjusts the flow rate of the airflow according to the setting conditions of the operating section 24.

The operating section 24 has a movable knob 25 on the control panel of the main body 1, as shown in FIG.

Furthermore, it has a pointer 26 linked to the movable knob 25, and a display plate 27 corresponding to the pointer 26.

The setting conditions of the movable knob 25 are displayed on the display board 2T.

For example, the following information may be displayed.

(1) Conditions for the finishing temperature of hot foods such as tsume, lukewarm, etc. (2) Conditions for the temperature before heating of foods to be heated such as frozen, refrigerated, room temperature, etc. (3) Conditions for one, two, three, etc. Conditions for the amount of heated items (4) Conditions for the type of heated items such as alcohol, milk, rice, etc. (5) Conditions for high frequency output such as high heat, low heat, etc. (6) Presence of wraps and containers, height of shelf boards Conditions (7) for the state in which the object to be heated is heated, such as the height of the heat
The operation of the above embodiment and the effects of each part will be explained.

Radio waves generated by magnetron 4 are radiated into cavity 3,
The object to be heated 13 is 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
Radiant heat radiated from power 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 by 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, as described above, the flow rate of the airflow passing through the sensing element 18 can be controlled by an external force.

The effect of adjusting the flow rate of the air flow is that the response of the sensing element 18 to the progress of heating the object to be heated can be changed.

That is, when the flow rate is increased, the response tends to be delayed, and when the flow rate is decreased, the response tends to be faster.

Therefore, the following adjustment makes it possible to control the object to be heated with higher precision.

(1) Increase the flow rate when concentrating the finishing temperature.

(2) Increase the flow rate for foods that have a low temperature before heating, such as frozen foods.

(3) If the amount is large, such as three or four servings, increase the flow rate.

(4) Reduce the flow rate when heating foods that are finished at low temperatures.

(5) Reduce the flow rate when the high frequency output is low (6 low heat).

(6) Reduce the flow rate when heating in a container with a lid or when heating away from the sensing element by lowering the height of the shelf board.

(7) When using other heat sources such as heaters, increase the flow rate.

Here, if the conditions of the cases shown in (1) 71- and (7) are reversed, the flow rate adjustment is also reversed.

In order to easily perform the above adjustments using external force, a movable knob 25 is provided as an operating means, and a pointer 26 and a display plate 27 are provided as display means on the control panel section of the main body 1. By clearly displaying the conditions shown in the case (7) above on the display board 27, adjustments can be made easily and clearly.

As described above, according to the present invention, it is possible to control the heating of the object to be heated without deforming the object, regardless of the type of object to be heated or the weight and rice temperature. It is possible to provide a high-frequency heating device that can be configured as follows.

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 humidity changes in airflow due to water vapor generated by the object to be heated. There is nothing that can be said about it.

[Brief explanation of 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. 1...Main body, 3...Cavity, 4...
...Magnetron, 5... Prowa, 18...
...Detection element, 25...Movable knob, 26.
...Pointer, 2T...Display board.

Claims (1)

[Claims] 1. A cavity 3 for storing an object to be heated, an opening through which air flows, and a physical change in the air flow near the outlet of the opening. A high-frequency heating device comprising a detection element 18 for detecting the detection element 18, a means for adjusting the flow rate of airflow passing through the detection element 18, a means for operating the airflow from an external force, and a display means for indicating operating conditions. 2. The high-frequency heating device according to claim 1, wherein the means for operating from an external force is a movable knob 25. 3. The high-frequency heating device according to claim 1, wherein the display means for indicating operating conditions is comprised of a pointer 26 and a display plate 21 that are linked to a movable knob 825. 4. The high-frequency heating device according to claim 1, wherein the display means for indicating operating conditions is a display board displaying finishing temperature conditions for the object to be heated. 5. The high-frequency heating device according to claim 1, wherein the display means indicating operating conditions is a display board displaying temperature conditions before heating the object to be heated. 6. The high-frequency heating device according to claim 1, wherein the display means for indicating operating conditions is a display board displaying conditions for the amount of the object to be heated. 7. The high-frequency heating device according to claim 1, wherein the display means for indicating operating conditions is a display board displaying conditions for the type of object to be heated. 8. The high-frequency heating device according to claim 1, wherein the display means for indicating operating conditions is a display board displaying high-frequency output conditions. 9. The high-frequency heating device according to claim 1, wherein the display means indicating operating conditions is a display board displaying conditions under which the object to be heated is heated. 10. The high-frequency heating device according to claim 1, wherein the display means for displaying operating conditions is a display board displaying conditions for a heat source such as a heater.