JPS5851523Y2 - High frequency heating device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a high-frequency heating device, particularly an exhaust port of a high-frequency heating device that has a function of dielectrically heating food in a heating chamber using high-frequency electromagnetic waves and a function of heating this food using heat from a heater. The purpose of this is to prevent the door screen provided on the door from fogging up during dielectric heating, and to prevent the atmospheric temperature within the heating chamber from dropping and the heating efficiency from decreasing when heating with a heater.

In order to expand the cooking uses of the high-frequency heating device, it is conceivable to provide a heater that increases the atmospheric temperature within the heating chamber and to configure the device so that so-called oven cooking can be performed by energizing the heater.

However, in this case, you must be careful of the following:

In other words, when food is dielectrically heated using high-frequency electromagnetic waves, the ambient temperature inside the heating chamber is relatively low, so water vapor from the food adheres to the door screen installed on the door and clouds it, making it difficult to see inside the heating chamber. I end up.

Therefore, in the high-frequency heating apparatus currently in practical use, air after cooling the high-frequency oscillator is sent into the heating chamber, and the water vapor is discharged together with this air to the outside of the heating chamber from the exhaust port.

In this case, it is desirable that the exhaust port be large in order to ensure smooth exhaustion, and this will increase the fogging prevention effect of the door screen.

However, when heating with a heater, the atmospheric temperature inside the heating chamber becomes high, so water vapor does not adhere to the door screen, and conversely, as mentioned above, as the exhaust port becomes larger, the hot atmosphere flows from the exhaust port to the outside of the heating chamber. It becomes easy to escape and the heating efficiency decreases.

Therefore, the present invention aims to solve the above problem by making the opening area of the exhaust port smaller when heating with a heater than when heating by dielectric.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a high-frequency heating device main body, and a heating chamber 2 is provided inside this main body 1.
A door 3 is provided at the front opening of the door 3 so as to be openable and closable.

This pore 3 has a choke groove 4 for preventing leakage of high frequency electromagnetic waves.
A handle 5, a door screen (not shown) made of a glass plate or punched metal, etc. are provided.

On the other hand, a high frequency oscillator 6 is provided outside the heating chamber 2, and the high frequency electromagnetic waves radiated from this high frequency oscillator 6 are transmitted through a waveguide 7.
The heating chamber 2 is supplied through the heating chamber 2.

The high-frequency oscillator 6 is cooled by cooling air from a blower 8, and the cooled warm air is sent into the heating chamber 2 through a blower duct 9.

Thereafter, this hot air is discharged to the outside of the main body 11 through the exhaust port 10.

Here, a valve plate B is provided in the air duct 9 and is supported by a shaft A as shown in FIG. There is.

Note that a valve plate B' is also provided inside the exhaust port 10 as shown in FIG. 1, and the operation of these valve plates B and B' will be described in detail later.

On the other hand, heaters 11 are provided on the outer bottom surface of the heating chamber 2, and these heaters 11 are insulated by a metal plate 12 and a heat insulating material 13.

Reference numeral 14 in FIG. 1 is an operation panel, and a changeover switch (not shown) provided on the operation panel 14 selectively switches energization to the high frequency oscillator 6' and the heater 11.

In the above configuration, when dielectrically heating food (not shown), the high frequency oscillator 6 and the blower 8 are energized.

Then, the food is dielectrically heated by the high frequency electromagnetic waves emitted from the high frequency oscillator 6, and the valve plate B is heated by the air after cooling the high frequency oscillator 6.

B' is pushed up.

Next, this will be explained with reference to equivalent drawings shown in FIGS. 3a and 3b.

That is, when performing dielectric heating, the air blowing and exhaust ports 9 and 10 are fully opened as shown in FIG. 10 and a normally open exhaust duct 1 that is always fully open.
5 to the outside of the heating chamber 2.

Therefore, the door screen of the door 3 will not become cloudy due to water vapor emitted from the food and the inside of the heating chamber 2 will not become difficult to see.

In addition, in this embodiment, the exhaust port 10 is 10 in the case of FIG.
The size is about 0 to 150 c♂.

Further, when the atmospheric temperature in the heating chamber 2 is to be raised by the heater 11, the heater 11 is energized by switching the changeover switch.

Then, the atmospheric temperature inside the heating chamber 2 becomes extremely high.
This causes the food to be cooked in a so-called oven.

In this case, since the blower 8 is not energized, the valve body B is
As shown in the figure, it is completely closed, and the exhaust port 10 of the valve body B' is completely closed.

Therefore, exhaust gas is discharged from the normally open exhaust duct 15.

The passage area of the normally open exhaust duct 15 is set at 115 to 1/20 of the exhaust duct 10 to prevent excessive exhaust from exiting the exhaust port 10 during oven cooking, resulting in a decrease in thermal efficiency. It is prevented.

As described above, according to the present invention, the door screen does not become cloudy during dielectric heating, making it difficult to see inside the heating chamber, and the heating efficiency does not decrease when heating with a heater.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a high-frequency heating device according to an embodiment of the present invention, Fig. 2a is a front sectional view of a blower duct of the same device, and Fig. 2a is a cross-sectional view taken along line bb' in Fig. 2a. Fig. 3a, b
FIG. 2 is a sectional view of a main part used to explain the operation of the device. 1...High frequency heating device main body, 2...Heating chamber, 6...High frequency oscillator, 10...
Exhaust port, 11... Heater, 15... Normally open exhaust duct.

Claims (1)

[Scope of utility model registration request] a high-frequency heating device main body, a heating chamber provided in the main body, a high-frequency oscillator that supplies high-frequency electromagnetic waves into the heating chamber, a blower that cools the high-frequency oscillator and blows the air into the heating chamber; A heater for raising the atmospheric temperature in the heating chamber, an exhaust port provided with a valve plate for discharging the air in the heating chamber, and a normally open exhaust port smaller than the passage area of the exhaust port, and connected to the high frequency oscillator and the heater. While selectively energizing, the valve plate of the exhaust port is opened at the time of high-frequency operation by the wind force of the wind sent into the heating chamber from the blower that cools the high-frequency oscillator, and is closed when the heater is energized to perform high-frequency heating. Device.