JPS6054562B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device having a mechanism for detecting the temperature of an object to be heated and automatically controlling the heating time.

In a high-frequency heating device such as a microwave oven, a method for automatically controlling the heating by detecting the heating state of the object to be heated is to detect the temperature of the air discharged from the heating chamber or the air inside the heating chamber. Methods of indirectly detecting temperature are being considered.

This is because when the object to be heated is heated, the air in the heating chamber is warmed by the temperature of the hot airflow and steam generated from the object, and this heated air is discharged from the heating chamber to reduce this temperature. This technology attempts to indirectly detect the temperature of the heated object, but the heated object may be heated to a certain temperature, such as when reheating cooked food to eat it. 90-10 like potatoes etc.
Some products require further heating for a certain amount of time to gelatinize the starch and soften the structure after heating to about 00C.However, it is necessary to detect the air discharged from the heating chamber or the air inside the heating chamber. In this method, when steam begins to be generated from the object to be heated, the temperature of the air discharged from the heating chamber rises rapidly, and eventually reaches thermal equilibrium, reaching a saturated state and no longer rising.

Therefore, with the method of detecting the temperature of the air discharged from the heating chamber, it is possible to bring the heated items to a temperature that is almost ready to eat by simply increasing the temperature, but the heated items that require temperature plus time cannot be heated. The above method plus a timer device is required.

By the way, in the case of the method of detecting the air discharged from the heating chamber or the air inside the heating chamber, from the viewpoint of detection accuracy it is not possible to introduce warm air into the heating chamber after cooling the high frequency generator, etc. There is no problem in the case of objects to be heated, as the heating will stop shortly after steam is generated, but in the case of objects to be heated, heating will stop shortly after steam is generated, but for objects to be heated, which require a temperature plus time to continue heating while generating a large amount of steam from the object to be heated. In this case, the finder section of the door may become cloudy with steam, making it impossible to observe the heating status of the object inside the heating chamber from the outside, or the heating chamber may be filled with water droplets due to the large amount of steam, which may cause problems during post-processing. There were disadvantages such as difficulty in The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, to avoid deterioration of detection accuracy, to prevent fogging of the viewfinder part of the door, and to prevent food products that require further heating at a higher temperature for a predetermined period of time. An object of the present invention is to provide a high-frequency heating device that allows comfortable cooking.

In order to achieve the above object, the present invention includes a temperature detection mechanism that detects the temperature of ventilation air in a heating chamber, an automatic control mechanism operated by the temperature detection mechanism, and a timer device that controls heating time. It is equipped with a switching means for switching the operation of the automatic control mechanism and the timer device, and an electromagnetic device linked to the switching means, and the operation of the switching means switches the air passage for ventilation in the heating chamber. .

The present invention will be explained below along with examples.

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 show an embodiment of a high-frequency heating device according to the present invention. Fig. 2 is a cross-sectional plan view of Fig. 1, showing the flow of wind when using an automatic control mechanism, and Fig. 3 is a cross-sectional plan view of Fig. 1, showing the flow of wind when using a timer device. Wind flow! It shows. Further, FIG. 4 shows the flow of air when automatically switching from the automatic control mechanism to the timer device. Figure 1, Figure 2, Figure 3, Figure 4
The arrows in the figure indicate the direction of the wind flow, solid line arrows indicate when an automatic control mechanism is used, and dashed line arrows indicate when a timer device is used. In Fig. 1, 8 is an air path switching device, 9 is a heating chamber exhaust port, 5 is an air path cutting device, and 18 is a control that can be operated from the outside in conjunction with the air path switching device and the air path cutting device. It is a switching device. The air path switching device 8 is composed of a high-frequency generator cooling air exhaust duct 8c shown in FIGS. 2, 3, and 4, and a damper 8a that is movable around a shaft 8b inside the duct 8c. The air path cutting device is composed of a heating chamber exhaust duct 5c and a damper 5a that is movable around a shaft 5b inside the heating chamber exhaust duct 5c. FIG. 2 is a plan sectional view of FIG. 1, showing the positions of the damper 8a and the damper 5a when the control switching device 18 is changed to the automatic control mechanism 13.

To explain the flow of wind when using only the automatic control mechanism, the high frequency generator 6 oscillates microwaves, and the object to be heated 2 is heated.

Then, the blower 7 rotates, and the air inside the heating chamber 1 is discharged from the heating chamber exhaust port 9. Outside air enters the heating chamber 1 from the heating chamber intake port/heating chamber exhaust port 15, passes around the object to be heated 2, flows out of the heating chamber from the heating chamber exhaust port 9, and is sent to the blower from the heating chamber exhaust duct 5c. While cooling the high-frequency generator 6 through the high-frequency generator 7, the air flows out of the high-frequency heating apparatus through the high-frequency generator cooling air outlet 10. On the other hand, outside air enters the machine room 17 through the machine room intake port 17a formed by drilling a group of small holes in the bottom of the high-frequency heating device, and is sucked into the blower 7 while cooling the electrical components. The discharged air passes through the high-frequency generator 6 and flows out of the high-frequency generator through the high-frequency generator cooling air outlet 10. Since the temperature detection mechanism 4 is provided in the air path cutoff device 5, it detects the temperature change of the air discharged from the heating chamber 1 through the heating chamber exhaust port 9, thereby detecting the temperature of the heated air. The temperature of the object 2 can be detected indirectly.

Then, when this detection signal is applied to the automatic control mechanism 13, when the rise in exhaust gas temperature reaches a preset value, the automatic control mechanism 13 stops the oscillation of the high-frequency generator 6 and ends the heating. let Next, the air passage when used in the timer device 14 will be explained using FIG. 3.

In use, the damper 8a and the damper 5a are placed in the state shown in FIG. 3 using the control switching device 18. As a result, the blower 7 operates during the heating period, and the machine room intake port 17
The outside air that enters the machine room 17 from the space a passes through the air path switching device 8 while cooling the electrical components and the like in the machine room, and enters the upper part of the partition plate 11 in the heat chamber 1 through the heat chamber inlet 16. After that, this wind is blown to the finder part of the door 3 from the partition plate hole 11a, passes around the object to be heated 2 while preventing steam condensation on the finder, passes through the heating chamber intake port and heating chamber exhaust port 15, Flows out of the high frequency heating device. That is, when used in the automatic control mechanism 13, hot air such as cooling air from the high frequency generator 6 is not introduced into the heating chamber 1 from the viewpoint of temperature detection accuracy, and when used in the timer device 14, the door 3 is closed.
The structure is such that warm air is introduced into the heating chamber 1 in order to prevent the viewfinder from fogging up. Next, the flow of air when the temperature of the object to be heated 2 is continuously raised using the automatic control mechanism 13 and heating is performed using the timer device 14 will be explained using FIG.

In FIG. 4, when in use, the damper 8a and the damper 5a are set to the solid line state using the control switching device 18,
At the same time, set the timer device to the desired time. When the power supply device 12 is turned ON, heating starts and the flow of air becomes as shown by the solid line. When the temperature of the heated object 2 rises to the set temperature and the automatic control mechanism 13 operates, the electromagnetic device 19 operates and pulls the switching lever 20.
Rotate around a. Then, the damper 8a and the damper 5a automatically move from the state shown by the solid line to the state shown by the broken line, changing the flow of the wind from the state shown by the solid line to the state shown by the broken line. At the same time, the timer device 14 starts operating and turns off the power after heating for the set time. Although the electromagnetic device 19 described above applies a tensile force to the switching lever 20, it goes without saying that it may also be a device that exerts a pushing force to operate the switching lever 20 in the same manner. The mechanism for automatically controlling the heating time of the object to be heated 2 has been described above, but the feature of the present invention is as shown in FIG.
The present invention is capable of automatically switching from the automatic control mechanism 13 to the timer device 14 using the following.

The temperature of the heated object 2 is automatically detected using the automatic control mechanism 13, and when the set temperature is reached, the electromagnetic device 19 is operated to automatically switch the damper 8a1 and the damper 5a to close the door 3.
Since hot air is blown onto the finder section of the door 3 and the timer device 14 is activated at the same time to continue heating for the set time, even when heating is continued while generating a large amount of steam from the object 2 to be heated, the finder section of the door 3 is heated. This eliminates the inconveniences in which the heated object 2 in the heating chamber 1 becomes cloudy with steam and cannot be observed from the outside, or in which the interior of the heating chamber 1 is filled with water droplets due to a large amount of steam.

In addition, only when heating is performed by the automatic control mechanism with the timer device set in advance, the automatic control mechanism is automatically switched to the timer device as described above.
The automatic switching by the electromagnetic device 19 does not operate unnecessarily, and the device can be made superior in both durability and ease of use. Furthermore, since the air path switching device can be switched manually by the user from outside the device, when using the automatic control mechanism or timer device alone, the device is quieter and easier to use than when using an electromagnetic device. I can do it. In the above explanation, the timer device 14 has been explained as a manual type, but the present invention is also applicable to a method in which a time that applies to the majority of the objects to be heated 2 is automatically set in advance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
Figure 3 is a cross-sectional plan view of Figure 1 showing the air passage of the automatic control mechanism, Figure 4 is a cross-sectional plane view of Figure 1 showing the air passage for the timer device, and Figure 4 is a cross-sectional plane view of Figure 1. It is a figure which shows the air path in the case of automatic switching from an automatic control mechanism to a timer device. In the figure, 1... Heating chamber, 2... Heated object, 4... Temperature detection mechanism, 13...
・Automatic control mechanism, 1-4... Timer device, 1
9... Electromagnetic device, 8... Air path switching device.

Claims (1)

[Scope of Claims] 1. A high-frequency heating device that supplies high-frequency power into a heating chamber that houses an object to be heated to heat the object, which includes a high-frequency generator and a temperature sensor that detects the temperature of ventilation air in the heating chamber. a mechanism, an automatic control mechanism operated by the temperature detection mechanism, a timer device for controlling heating time, a switching means for switching the operation of the automatic control mechanism and the timer device, and an electromagnetic device interlocked with the switching means. By operating the switching means, if an automatic control mechanism is used, the cooling air from the high-frequency generator is not allowed to enter the heating chamber, but if a timer device is used, the air is ventilated into the heating chamber. A high-frequency heating device characterized by being equipped with an air path switching device. 2. The high-frequency heating device according to claim 1, characterized in that the air path switching device is manually switched from a state in which a timer device is used to a state in which an automatic control mechanism is used, or vice versa. 3. The high-frequency heating device according to claim 1, characterized in that the air path switching device is switched and driven by an electromagnetic device in conjunction with the operation of an automatic control mechanism. 4. The high frequency device according to claim 1, characterized in that the heating is automatically switched from the automatic control mechanism to the timer device only when heating is performed by the automatic control mechanism with the timer device preset. heating device.