JPS5821179B2 - 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 high-frequency heating devices such as microwave ovens, this method detects the heating state of the object to be heated and automatically controls the heating.
A method has been considered in which the temperature of the object to be heated is indirectly detected by detecting the temperature of the air discharged from the heating chamber or the air inside the heating chamber.

FIG. 1 shows a conventional example of a high-frequency heating apparatus which is equipped with an automatic control mechanism of the above method and a conventional manual control mechanism such as a timer.

FIG. 2 is a plan sectional view of FIG. 1, showing the flow of air in the case of an automatic control mechanism.

FIG. 3 is a cross-sectional plan view of FIG. 1, showing the flow of air in the case of a manual control mechanism.

The arrows in FIGS. 1, 2, and 3 indicate the direction of the wind flow, and the solid line arrows indicate the automatic control mechanism, and the broken line arrows indicate the manual control mechanism.

As shown in FIGS. 2 and 3, the damper 17a in the air path switching device 17 functions to change the flow of air in conjunction with switching between the automatic control mechanism and the manual control mechanism.

To explain the air path when used in the automatic control mechanism 13 shown in FIG. The air flows out of the heating chamber through the heating chamber exhaust port 9, and flows out of the high frequency heating device through the high frequency generator cooling air exhaust port 10 while cooling the high frequency generator 6 from the heating chamber exhaust duct 16 via the blower 7. .

On the other hand, outside air enters the machine room 21 from the machine room intake port 21a formed by making a small hole in the bottom of the high-frequency heating device, and is sucked into the blower 7 while cooling the electrical components.
Together with the discharged air, the air passes through the high-frequency generator 6 and flows out of the high-frequency heating device through the high-frequency generator cooling air outlet 10.

In FIG. 2, when the temperature detection mechanism 4 detects a change in the temperature of the air discharged from the heating chamber 1 through the heating chamber exhaust port 9, the temperature of the object to be heated 2 can be indirectly detected.

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.

Next, the air passage when used in the manual control mechanism 14 such as a timer will be explained using FIG. 3.

In use, the control switching device 18 is used to set the damper 17a in the air path switching device 17 to the state shown in FIG.

As a result, the blower 7 operates during the heating period, and the outside air that enters the machine room 21 from the machine room intake port 21a is passed through the blower 7 while cooling the electrical components in the machine room, and the high-frequency generator 6 while cooling it. It passes through the air path switching device 1T and enters the upper part of the partition plate 11 in the heating chamber 1 from the heating chamber inlet 19.

Thereafter, this air is blown onto a part of the finder of the door 3 through the partition plate hole 11a, passes around the object to be heated 2 while preventing steam condensation on the finder, and passes through the heating chamber intake and heating chamber exhaust port 15. 9. Flows out of the high frequency heating device.

Further, the wind after being blown onto a part of the finder of the door 3 flows out of the heating chamber 1 from the heating chamber exhaust port 9 and is sent to the blower and the high frequency generator 6.

That is, when using an automatic control mechanism, hot air is not introduced into the heating chamber 1 from the viewpoint of temperature detection accuracy, and when using a manual control mechanism, hot air is not introduced into the heating chamber 1 to prevent fogging of a part of the finder of the door 3. It is configured to be placed inside a heating chamber 1.

However, in the air passages as shown in FIGS. 1, 2, and 3, when using the automatic control mechanism 13, even if food burns in the heating chamber, the temperature detection mechanism 4 There is no problem because it detects abnormal temperature at the time and turns off the power.
If food burns in the heating chamber when used with the manual control mechanism 14, flames may be sucked out from the heating chamber exhaust port 9 to the blower 7, and the fire may spread to the heating chamber exhaust duct 16, the blower, etc. However, it had the disadvantage of being dangerous due to flames.

An object of the present invention is to eliminate the drawbacks of the above-mentioned prior art in a high-frequency heating device in which the automatic control mechanism 13 and the manual control mechanism 14 are provided together, and to provide a highly safe high-frequency heating device.

In order to achieve the above object, the present invention includes a temperature detection mechanism 4 that detects the temperature of ventilation air in a heating chamber, an automatic control mechanism 13 for high frequency output operated by the temperature detection mechanism, and a manual control mechanism for heating time. 14, an air path switching device for switching the air path of air ventilating the heating chamber in response to the operation of the manual control mechanism 14 and the automatic control mechanism 13 is provided at the popular opening 19 of the heating chamber; An air passage blocking device 5 is provided at the exhaust port.

The present invention will be explained below along with examples.

FIG. 4, FIG. 5, and FIG. 6 show an embodiment of the high-frequency heating device according to the present invention.

In FIG. 4, 17 is an air path switching device, 9 is a heating chamber exhaust port, 5 is an air path blocking device, and 18 is a control switching device that can be operated from the outside in conjunction with the air path switching device and the air path blocking device. .

The air path switching device 17 is composed of a high frequency generator cooling air exhaust damper N7c shown in FIGS. 5 and 6, and a damper (1) 17a that is movable around an internal shaft (1) 17b.

In addition, the air path blocking device is a heating chamber exhaust damper (2) 5c and a damper (2) 5a that is movable around the shaft (2) 5b inside the damper (2) 5a.
It consists of

FIG. 5 is a plan sectional view of FIG. 4, and shows the control switching device 18.
The damper when the automatic control mechanism 13 is set (
1) Shows the positions of 7a and damper (2) 5a.

The arrows in Figures 4, 5, and 6 indicate the direction of the wind flow; solid arrows indicate the direction of the wind flow when used with an automatic control mechanism, and dashed arrows indicate the direction of the wind flow when used with a manual control mechanism. Direction.

When used in an automatic control mechanism, the damper (2) 5a of the air path cutoff device 5 is in the position shown in FIG.
The heated air in the heating chamber 1 is sucked out from the heating chamber exhaust port 9 and flows to the blower.

Here, since the temperature detection mechanism 4 is provided in the air path cutoff device 5, the temperature rise of the ventilation air is detected by this, and the heating of the object to be heated 2 is controlled.

When used with a manual control mechanism, the damper (2) 5a of the air path breaker 5 is in the position shown in FIG. 6 to prevent air within the heating chamber from flowing out through the heating chamber exhaust port 9.

Here, the damper (2) 5a is made of flame retardant or non-combustible material such as metal.

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 FIGS. 5 and 6. A path switching device 17 is provided at a popular opening 19 of the heating chamber, and an air path cutting device 5 is further provided at an exhaust port 9 of the heating chamber.

If the object to be heated 2 is heated too much in the heating chamber, it may emit smoke, and if heated further, it may catch fire.

In the case of the automatic control mechanism shown in FIG. 5, the temperature inside the heating chamber is detected by the temperature detection mechanism 4, so ignition will not occur.

However, if the heating time is set too long when a manual control mechanism is used, the object to be heated 2 may catch fire in the heating chamber.

However, as shown in FIG. 6, since the air path cutoff device 5 is provided at the heating chamber exhaust port 9, the heating chamber
There is no risk of flames emerging outside and spreading the fire.

Furthermore, since the damper (2) 5a is made of flame retardant or non-combustible material such as metal, it has excellent flame resistance and is highly reliable.

In the above explanation, when used in an automatic control mechanism, the oscillation of the high frequency generator 6 is stopped when the exhaust temperature reaches a preset value. The present invention is also applicable when heating is continued by reducing the high frequency power.

As described above, according to the present invention, the air path cutoff device 5 is provided at the heating chamber exhaust port 9, so that even if the object to be heated in the heating chamber catches fire, there is no risk of fire spread, and the device can be used safely. can do.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example of a high-frequency heating device equipped with both an automatic control mechanism and a manual control mechanism, Fig. 2 is a plan cross-sectional view of Fig. 1, showing the air passage in the case of automatic control, and Fig. Figure 3 is
FIG. 2 is a plan sectional view of FIG. 1 showing an air path in the case of manual control; FIG. 4 is a perspective view showing an embodiment of the present invention, FIG. 5 is a sectional plan view of FIG. 4 in the case of automatic detection, and FIG. 6 is a sectional plan view of FIG. 4 in the case of manual control. . In the figure, 1... heating chamber, 2... object to be heated, 4...
...Temperature detection mechanism, 5...Air path cutoff device, 13...
Follow-up control mechanism, 14... Manual control mechanism, 17... Air path switching device.

Claims (1)

[Scope of Claims] 1. In a high-frequency heating device that supplies high-frequency power into a heating chamber 1 housing an object to be heated 2 to heat the object to be heated,
It is equipped with a temperature detection mechanism 4 for detecting the temperature of ventilation air in the heating chamber, an automatic control mechanism 13 for high frequency output operated by the temperature detection mechanism, and a manual control mechanism 14 for heating time, and the manual control mechanism 14 and Automatic control mechanism 13
An air path switching device for switching the air path of air to ventilate the heating chamber in response to the operation of the heating chamber is provided at the heating chamber air outlet 19, and an air path breaker device 5 comprising a movable damper 5a is provided at the heating chamber exhaust port 9. A high-frequency heating device characterized by being provided with. 2. The damper 5 of the air passage blocking device 5 provided at the heating chamber exhaust port 9 in the high-frequency heating device according to claim 1
A high-frequency heating device characterized in that a is made of a flame-retardant (or non-combustible) material.