JPS6032768B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to improve the partition plate used in the heating chamber of a high-frequency heating device and to realize a device with higher durability.

FIG. 1 is a cross-sectional view of a general high-frequency heating device.

In FIG. 1, reference numeral 1 denotes a heating chamber, a waveguide 2 is connected to the heating chamber 1, and a magnetron 3, which is a high frequency oscillator, is provided in the waveguide 2. The radio waves oscillated from the magnetron 3 pass through the waveguide 2 and are irradiated into the heating chamber 1 from the radio wave power supply opening 4 provided in the heating chamber 1, thereby high-frequency heating the food 5, which is the object to be heated. The heating chamber 1 is further provided with a heater 6 composed of a sheathed heater, an infrared heater, etc., and the food 5 is heated with the heater. For the food 5, the most suitable heating method is selected and used by high-frequency heating or heater heating, either alone or by using both methods in combination. A partition plate 7 is provided in the closure 4 for radio wave power feeding. The partition plate 7 is made of a laminate of glass cloth, heat-resistant glass, crystallized glass porcelain, or the like. In such a high-frequency heating device, if the partition plate 7 is made of a glass cloth laminate, the heat resistance temperature is relatively low, so thermal deterioration may occur when the heater 6 heats the heater. If an attempt is made to lower the temperature of the partition plate, it is impossible to raise the temperature of the heater 6 to a sufficiently high temperature, resulting in insufficient heating by the heater.

If the partition plate 7 is made of heat-resistant glass, crystallized glass porcelain, etc., the heat-resistant temperature will be higher, and the above-mentioned drawbacks will be eliminated, but the high dielectric constant will cause loss to radio waves, making it difficult to use high-frequency heating. There are drawbacks such as reduced processing efficiency and increased processing costs, both of which are undesirable. It is an object of the present invention to eliminate the drawbacks of the conventional high-frequency heating devices described above, to further enhance durability, and to improve heating performance.

FIG. 2 is an enlarged partial sectional view of the partition plate of the high-frequency heating device according to the present invention, and the mounting structure and the mounting portion are the same as the structure shown in FIG. 1.

In FIG. 2, 8 is a piece of mica impregnated with heat-resistant resin 9. Here, the feature of the present invention is that the cut end surface is further impregnated with a resin 10 such as silicone. A so-called mica board, which is simply a mica piece 8 impregnated with a heat-resistant resin 9, does not absorb moisture because its surface is covered with the heat-resistant resin 9.

However, in the case of such a conventional mica plate, the cut end surface of the mica piece 8 and the heat-resistant resin 9 is exposed in a layered manner at the end surface cut by press working or the like. If water or steam adheres to this end surface portion, it will be absorbed by capillary action, and the mica piece 8, which is used for a long time, will peel off. Because of these drawbacks, mica plates are not often used in humid areas such as the heating chambers of high-frequency heating devices. The present invention overcomes these drawbacks of the conventional mica board by further impregnating the cut end face with resin 10 to prevent water absorption even if water or steam adheres to the end face portion.
This prevents the cut end surface from peeling off and makes it possible to use it in a humid part of the heating chamber of the high-frequency heating device. In the high-frequency heating device according to the present invention provided with such a partition plate, it is possible to prevent deterioration of the partition plate due to water absorption, so it goes without saying that a highly durable device can be realized.
Compared to conventional glass cloth laminates used as partition plates, the mica partition plate according to the present invention has a higher heat resistance and is therefore superior in terms of thermal deterioration, resulting in a highly durable device.

Furthermore, since the temperature of the heater can be made sufficiently high, the heating performance of the heater can also be improved. Furthermore, compared to conventional partition plates made of heat-resistant glass, crystallized glass, porcelain, etc., the mica partition plate according to the present invention has a low dielectric constant and dielectric loss, so there is less loss against radio waves, and it is suitable for high-frequency heating. Time efficiency increases. In addition, cutting and punching using a press, drilling, etc. can be easily performed, so processing can be done at low cost, and the partition plate can be easily fixed with screws, etc., so assembly is easy. Moreover, since the material cost is low, it can be constructed extremely economically. As described above, according to the present invention, a high-frequency heating device having a simple structure, high durability, and high heating efficiency can be constructed more economically.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a general high-frequency heating device, and FIG. 2 is an enlarged partial sectional view of a partition plate of a high-frequency heating device showing an embodiment of the present invention. 1. ．．・Heating chamber, 2... Waveguide, 3... Magnetron, 4... Opening, 6... Heater, 7... Partition plate, 8...
...Mica piece. Figure 1 Figure 2

Claims (1)

[Claims] 1. A high-frequency heating device characterized in that a partition plate made of a mica plate is provided between a heating chamber and a radio wave power supply part, and an end surface of the partition plate is impregnated with resin.