JPH0224006Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to improvement of heating unevenness in a high frequency heating device.

BACKGROUND ART There is a high-frequency heating device called a microwave oven that cooks food using high-frequency energy as a heating source and radiant heat from a heater provided on the ceiling of a heating chamber. This microwave oven is equipped with a pipe-shaped sheathed heater on the ceiling of the heating chamber, and in order to fix this heater to the ceiling of the heating chamber,
Conventionally, materials with high heat resistance and low dielectric loss have been used, as shown in Japanese Utility Model Application Publication No. 53-4465. However, in terms of cost and strength, it is better to equip the heater support with a metal plate. In the case of a configuration equipped with this metal heater support, the heater support is affected by high-frequency energy, so it is manufactured in a small size, and its location is avoided near the high-frequency power supply port, and is placed at a location away from the high-frequency power supply port. It was set up.

Problems to be Solved by the Invention The above configuration cannot completely eliminate the influence of the heater support on high frequency energy, and in some cases there is a risk that sparks may occur between the heater support and the heater.

Means to solve the problem In this invention, the installation interval of two heater supports is reduced by 1/2.
It is placed close to the high-frequency power supply port so as to be smaller than the wavelength, and is provided so that its plate surface faces the high-frequency power supply port.

Function Two heater supports are close to the high frequency power supply port,
Moreover, the board surface is opposite to this one, and there are also two
Since the cutoff wavelength between each heater support is within 1/2 wavelength, it acts as a reflector and the heater does not function as an antenna.

Embodiment 1 is a heating chamber composed of a metal plate, and the heating chamber side wall 2
A high-frequency power supply port 3 is provided at , and a high-frequency oscillator 5 is coupled through a waveguide 4 . A heater 7 is fixed to the heating chamber ceiling 6 with a heater support 8 made of a metal plate, and a saucer 9 made of a material with high heat resistance and low dielectric loss is installed on the bottom of the heating chamber 1, and the food 10 is placed on the bottom of the heating chamber 1. It is posted. The tray 9 is rotatably supported via a turntable support 12 by a drive device 11 provided outside the heating chamber 1 . The two heater supports 8 and 9 are λ/
It is close to the high-frequency power supply port 3 at a distance B of 2 or less, and its plate surface is opposite to this, and one end is fixed to the heating chamber ceiling 6 by welding or the like, and the other end is attached to the heaters 8 and 9 by caulking or the like. It is fixed.

Next, the operation of the above configuration will be explained.

The high-frequency energy generated by the high-frequency oscillator 5 passes through the waveguide 4 and is guided into the heating chamber 1 from the high-frequency power feed port 3 provided on the side wall 2 of the heating chamber.
The food 10 above is dielectrically heated. At this time, a part of the high frequency energy radiated into the heating chamber 1 from the high frequency power supply port 3 is reflected from the metal plate heater supports 8 and 9 provided opposite to the high frequency energy, and is transferred to the food 10 on the saucer 9. reach. Two heater supports 8, 9
is located symmetrically so that its plate surface faces almost the center of the high-frequency power feed port 3, and the distance B is λ/2.
Since the cut-off wavelength is selected within the range, the heater acts as a reflector and does not act as an antenna, so no high-frequency current flows on the heater surface, and therefore there is no interference between the heater support and the heater. No sparks are generated.

Effects of the invention As described above, according to the invention, the cut-off wavelength between the two heater supports is within λ/2, and the cut-off wavelength is placed close to the high-frequency power supply port to function as a reflector, thereby improving uneven heating of food. effective. Furthermore, since the plate surface is placed opposite the high-frequency power feed port, there will be no sparks or abnormal heating.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a heating chamber of a high-frequency heating device showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part taken along the plane A--A in FIG. 2... Heating chamber side wall, 3... High frequency power feed port, 6...
... Heating chamber ceiling, 7... Heater, 8, 9... Heater support, 10... Food.

Claims (1)

[Scope of utility model registration request] In a high-frequency heating device in which a heater 7 is fixed to a heating chamber ceiling 6 using heater supports 8 and 9 made of metal plates, food 10 is cooked using radiant heat from the heater 7 and high-frequency energy from a high-frequency power supply port 3 on a side wall 2 of the heating chamber. A high-frequency heating device characterized in that the heater supports 8 and 9 are arranged close to the high-frequency power feed port 3 with an interval B of 1/2 wavelength or less, and their plate surfaces face the high-frequency power feed port 3.