JPS5858567B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a hollow-finished part used in the heating chamber of a so-called oven range, which incorporates a heater device for increasing browning in a high-frequency heating device. The purpose of the present invention is to make it possible to function both at times and when the heater is operating, and to reduce high frequency loss during high frequency operation.

A conventional high-frequency heating device with a heater will be explained with reference to FIGS. 1 and 2.

There is a heating chamber 2 within the main body 1.

Inside this heating chamber 2 is a magnetron 3 which is a high frequency oscillator.
The high frequency waves generated are radiated through the waveguide 4 and the feed port 5.

The high frequency waves radiated into the heating chamber 2 heat the food to be cooked 9 placed on the wire mesh 8 placed on the rotary mounting table 6 and the oil pan 7.

The reason for using an oil catcher is to prevent the oil from scattering when cooking food that drips oil, such as chicken.

Next, in order to improve the heating distribution during high-frequency heating, a metal rotating mounting table 10 is provided below the rotating mounting table 6, and a magnet 11 is attached to this mounting table 10. Driving magnet 1 attached to a rotating body 12 attached to the outdoor bottom wall
3 rotates, the metal rotating mounting table 10 rotates on the rollers 14.

Note that 15 is a motor, 16 is a pulley, and 17 is a belt that rotates the rotating body 12.

On the other hand, the heater 18 is provided above the heating chamber 2.
It increases the internal temperature and browns the heated item.

FIG. 2 shows another example of the use of the high-frequency heating device with a heater, in which a porcelain saucer support 20 is suspended from a pin 19 provided on the side wall of the heating chamber, and a hollow 2
2-treated saucer 23 is placed.

The object to be heated 24 is placed on the tray and heated by the upper heater 18 and the lower heater 25.

The reason why the saucer 23 treated with hollow 22 is used here is that it absorbs the heat of the lower heater well due to its black color, and the heat distribution on the saucer 23 is because the iron plate has better thermal conductivity than stainless steel etc. This is because they can do it well.

In the above conventional example, for example, a heater heating IC is suitable for the saucer 23, but during high-frequency heating, the high-frequency efficiency decreases by the loss due to the skin current due to the high frequency, and when it is removed, it becomes hot and there is a risk of burns.

Therefore, it has been difficult to put it into practical use due to the above-mentioned drawbacks, such as when continuously switching from high frequency heating to heater heating, from heater heating to high frequency heating, or when performing heater heating and high frequency heating at the same time.

The present invention aims to improve the above-mentioned drawbacks by a simple method, and only the differences from the conventional example will be explained below.

Figure 3 is an improved version of part A in Figure 2.
3 has a hollow 22 treatment on the iron plate 21, whereas
In FIG. 3, an iron plate 21 is coated with aluminum 26, and a hollow 22 is coated thereon.

The method of coating the iron plate 21 with aluminum 26 can be easily obtained by passing it through an aluminum solution in the final step of making the iron plate.

Therefore, it is sufficient to process the iron plate 21 coated with aluminum 26 to form the saucer 27, and then process the hollow 22.

The relationship between the time (minutes) and the temperature rise (deg) of the saucer 27 when the saucer 27 is left in a heating chamber with a high frequency output of 600 W is shown by a curve aK in FIG.

Curve a is approximately 60 deg after 20 minutes of heating (with only the saucer 27 inserted), but when the iron plate 21 shown in Fig. 2 has been treated with enamel 22, the curve becomes flat and becomes 96 deg after 20 minutes of heating. , is 60% higher than curve a.

Furthermore, curve C is a result of a similar experiment conducted on stainless steel.

As a result of the above, if the saucer 27 is used, the temperature of the saucer will not rise even during high frequency operation, the risk of getting burned when serving food is extremely reduced, and the high frequency loss on the surface of the saucer is reduced. Approximately 40 compared to when using 23
The efficiency of the heating chamber improves accordingly.

Additionally, aluminum has better thermal conductivity than iron, which equalizes the heat distribution in the saucer and improves cooking performance.

Next is the saucer support.In Figure 2, a ceramic one was used, but in Figure 3, an aluminum 26
An iron plate 21 coated with is processed and then treated with a hollow 22 to form a saucer support fitting 28.

This tray support fitting 28 is pulled up by a pin 30 fixed to a heating chamber wall 29 with a nut 31.

By doing this, since the heating chamber wall 29 and the saucer support fitting 28 are insulated by the hollow hole 22, it is possible to obtain a saucer support fitting that does not cause discharge or the like and has less high frequency loss and less temperature rise.

In addition, since it can be made thinner than ceramics, a large saucer can be used and the inside of the heating chamber can be used more widely.

Furthermore, compared to ceramics, hollow treatment is suitable for mass production, making it cheaper and more economical.

Next, for the oil pan 7 shown in Figure 1, if an aluminum-coated iron plate with a hollow treatment is used in the same way, high-frequency loss and temperature rise will be reduced, reducing the risk of burns, etc., and the heater and high-frequency When heating at the same time as oil pan 7
When the temperature of the heating chamber rises, the oil that has fallen from the heated object splatters and adheres to the walls of the heating chamber, reducing the effectiveness of the oil catcher.

However, according to the present invention, the fallen oil enters the rotary mounting table 6 in one groove and causes very little dirt on the walls of the heating chamber.

Next, if the wire mesh 8 and the metal rotary mounting table 10 are made of iron material coated with aluminum and then treated with a hollow treatment, it is possible to reduce high frequency loss and temperature rise in the same manner as described above.

In addition, compared to stainless steel, it discolors and becomes unsightly at temperatures of around 200 degrees Celsius, but by making it hollow, it does not discolor and the oils carbonize, making it easy to clean even when it gets stuck. It is also economical due to its low cost.

As is clear from the above explanation, by using aluminum-coated iron parts with a hollow finish as the metal parts used in the heating chamber of the high-frequency heating device, (a) high-frequency loss is reduced and efficiency is improved; do.

(b) Temperature rise is low and there is no risk of burns when serving food.

(C) It is suitable for mass production and is economical.

(d) No discoloration even when used at high temperatures.

(e) Sufficient strength can be obtained even if it is made thinner, and a wider heating chamber can be used.

Due to these effects, heater heating and high-frequency heating can be switched continuously or heated simultaneously.

[Brief explanation of drawings]

1 and 2 are pressure surface sectional views of a conventional high-frequency heating device with a heater, FIG. 3 is an enlarged sectional view of main parts showing an embodiment of the present invention, and FIG. 4 is a sectional view of a conventional high-frequency heating device with a heater. It is a figure which shows the experimental result of the temperature rise value at the time of high frequency heating with an object. 20... saucer support, 21... iron plate, 22... hollow 23.27... saucer, 26... aluminum.

Claims (1)

[Claims] 1 A heating chamber formed in the main body, a high-frequency oscillator that emits high-frequency waves to the heating chamber, and parts used in the heating chamber such as a metal saucer, support metal fittings such as the saucer, and a metal rotating mounting table. . A high-frequency heating device, wherein the metal parts are hollow-finished with an aluminum-coated iron material.