JPS5829591B2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device equipped with a heater for browning, and its purpose is to prevent leakage of high-frequency electromagnetic waves from the heating chamber and to reduce the heating efficiency of this heater. The goal is to prevent

High-frequency heating devices that uniformly heat the outside and inside of food using high-frequency electromagnetic waves and then brown the surface of the food using a heater have been put into practical use and are attracting attention.

However, the ones currently in practical use have a first
As shown in the figure, a lead wire 3 is passed through a through hole 2 formed in the wall surface 1 with a certain gap, and therefore, there are the following drawbacks.

This runner-up means that the lead wire 3 becomes an internal conductor for high-frequency electromagnetic waves, and the wall surface 1 becomes an external conductor.
Therefore, the high-frequency electromagnetic plate leaks from the heating chamber 4 to the outside 5 of the heating chamber through this coax 5, and as a result, the sound of the radio receiver and the sound and video of the television receiver are disturbed. .

Therefore, conventionally, as shown in FIG. 2, a radio wave choke cavity 6 with a depth of λ/4 cm (λ is the wavelength length of the high frequency electromagnetic wave emitted from the high frequency oscillator) is provided in the through hole 2 portion, As shown in FIG. 3, a metal tube 7 is connected to a lead wire 3 and a heater (not shown) connected to this lead wire 3.
Although the metal tube 7 and the wall surface are electrically short-circuited by covering the metal tube 7 with a wall surface, these methods have the following drawbacks.

First, in the case shown in Figure 2, high-frequency electromagnetic waves of a certain frequency can be attenuated by this radio wave choke cavity 6, but high-frequency electromagnetic waves of a frequency generated by unnecessary radiation cannot be attenuated in this part. As a result, the high frequency electromagnetic waves leaked outside the heating chamber 5.

On the other hand, in the case shown in FIG. 3, there is no leakage of high-frequency electromagnetic waves at all, but in this case, the heat of the heater is transmitted into the heating chamber via the insulator 8 and the metal tube γ. As a result, the heating efficiency of the heater decreases due to poor heat transfer.

Therefore, the present invention provides a secondary coil on the inner wall surface of the heating chamber and connects a heater to the secondary coil, thereby solving the above-mentioned conventional problem.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In Fig. 4, 9 is the main body case, and this main case 9
A heating chamber 10 is provided inside the heating chamber 10, and a door 11 is provided at the front opening of the heating chamber 10 so as to be openable and closable.

Further, an operation panel 12 is attached to the upper front of the main body case 9, and a timer knob 1 is also mounted on this operation panel 12.
3, a cooking start switch 14, a button 15 for energizing a high frequency oscillator (not shown), and a heater 1 in the heating chamber 10.
6 is provided with a button 17 for energizing.

The heater 16 is provided to brown the surface of food such as fish 18 in the heating chamber 10, and has a power of 1 kW.
I'm using one.

Further, a primary winding 21 wound around a core 20 is provided on the outer wall surface of the wall surface 19 of the heating chamber 10, as shown in FIG. A secondary winding 23 is provided.

Both cores 20 and 22 are connected to the wall surface 1 with rivets 24.
Therefore, the secondary coil 21 and the secondary coil 23 are magnetically coupled via this wall surface 19.

Additionally, the secondary coil 23 is covered with a metal cover 25, and the heater 16 is connected to lead wires 25a extending nine from the metal cover 25.

In FIG. 5, 26 is an insulator made of a low-loss dielectric, and 27 is a screw.

When grilling the fish 18 in the above configuration, first press the button 15 to set up a system for energizing the high frequency oscillator, then set the heating time with the high frequency oscillator using the timer knob 13, and then press the cooking start switch 14.

Then, a high frequency electromagnetic wave is emitted from the high frequency oscillator into the heating chamber 10, and the surface and inside of the fish 18 are dielectrically heated uniformly by this high frequency electromagnetic wave.

Further, in this case, the wall surface 19 of the heating chamber 10 is not provided with a through hole as in the conventional case.
High frequency electromagnetic waves will not leak outside.

Further, since the secondary winding 23 is covered with the metal cover 25, its insulation will not deteriorate due to high frequency electromagnetic waves, and magnetic flux will not leak into the heating chamber 10 and disturb the electric field.

Next, if you want to brown the surface of this fish 18, prepare a system to press the button 17 and energize the primary winding 20,
Next, the timer 13 is used to set the heating time with the heater 16, and then the cooking start switch 14 is pressed.

Then, the − secondary winding 21 is energized, and as a result, the secondary winding 2
A voltage is induced in the fish 18, and this voltage causes the heater 16 to generate heat, and this heat browns the surface of the fish 18.

As described above, in the high-frequency heating device of the present invention, a secondary coil is provided on the inner wall surface of the heating chamber to which high-frequency electromagnetic waves are supplied indoors, and the secondary coil is magnetically coupled to the primary coil on the outer wall. A heater is connected.

Therefore, unlike in the past, high-frequency electromagnetic waves do not leak from the heating chamber to the outside of the heating chamber via the energizing path to the heater, and as a result, as in the past, the leaked radio waves cause the sound of a radio receiver or the sound of a television receiver. It does not disturb images, etc.

In addition, the heat from the heater is directly transmitted to the food in the heating chamber, and the heat does not escape through the energized path to the heater, so the heating efficiency is high, and as a result, the surface of food such as fish does not brown. This allows for quick browning.

Furthermore, if you install a tap on the -order winding and switch that tap, or change the voltage applied to the -order winding,
The amount of heat generated by the heater can be varied over a wide range, making it possible to brown each food item appropriately.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views of the main parts of a conventional high-frequency heating device.
FIG. 4 is a perspective view of a high-frequency heating device according to an embodiment of the present invention, and FIG. 5 is an enlarged sectional view of a main part of the device. 10... Heating chamber, 16... Heater, 1
9...Wall surface, 21...-Next winding, 23
...Secondary winding, 25...Cover.

Claims (1)

[Claims] 1. A primary coil is provided on the outer wall of a heating chamber into which high-frequency electromagnetic waves are supplied indoors, and a secondary coil is provided on the inner wall of this heating chamber, and the above-mentioned primary coil and secondary coil are heated. A high-frequency heating device in which a heater is magnetically coupled through a wall of a chamber and connected to a secondary coil within the heating chamber. 2. The high-frequency heating device according to claim 1, wherein the secondary coil is covered with a metal cover in the heating chamber.