JPH0642755A - High frequency heater - Google Patents

Abstract

PURPOSE:To prevent leakage of radio wave from a heater power supply line passed through a metal wall of a heating chamber in a simple structure without any choke system. CONSTITUTION:A through hole 7 is opened in a metal wall 2 of a heating chamber. A metal cylinder 6 is provided at the same potential in the hole 7, and a power supply coiled wire 11 for supplying power from the outside of the chamber 1 to an electric heating wire 4 in the chamber 1 is passed through the cylinder. The coil is so provided that at least its one winding is in the cylinder 6. Thus, the cylinder 6 and the wire 11 do not constitute a coaxial transmission line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus adopting a combined heating system using high-frequency energy and an electric heater as heating sources, and penetrating a power supply line for supplying electric power to the electric heater installed in a heating chamber. The present invention relates to a technique for preventing leakage of high frequency energy (high frequency radio waves) from the wall portion of the heating chamber.

[0002]

2. Description of the Related Art A grill heater having a coil-shaped heater wire is provided in a heating chamber of a high-frequency heating apparatus for inductively heating food by introducing high-frequency energy, and a compound heating system for externally heating food is adopted. JP-A-59-1344
27, JP-A-59-150221 and the like.

[0003]

A power transmission line for supplying electric power for a heater from the outside of the heating chamber to the inside of the heating chamber forms a coaxial transmission line at a portion penetrating the metal heating chamber wall. Since there was a risk of leaking high-frequency energy inside the heating chamber to the outside of the heating chamber, conventionally, in order to prevent this, a choke structure had to be formed in a portion of the heating chamber wall where the power supply line penetrates.

However, there is a problem that the choke structure is not only complicated but a sufficient sealing effect cannot be obtained.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a heating chamber formed by a metal wall for heating food by high frequency energy and food by electric heat energy. An electric heating wire attached to the inside of the heating chamber for heating,
An electric wire for supplying electric power from the outside of the heating chamber to this electric heater wire, and a power supply line having a coil portion formed in a part thereof, and a power supply line opened to penetrate this power supply line into the heating chamber wall High frequency heating with a through hole and a metal tubular body attached to the metal wall of the heating chamber in which the through hole is opened at the same potential and surrounding at least one turn of the coil portion of the power supply line and penetrating therethrough. Configure the device.

[0006]

The heating chamber wall and the power supply line do not form a coaxial transmission line, so that the high frequency energy in the heating chamber does not leak to the outside.

[0007]

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

In the figure, 1 is a heating chamber, and 2 is a metal wall forming the heating chamber, which is omitted. Reference numeral 3 denotes an electric heating grill heater provided in the heating chamber 1 for heating and cooking food (not shown), 4 denotes a coil-shaped electric heating wire constituting the electric heating heater 3, and 5 denotes this electric heating wire. 4 is a cylindrical heater support tube made of a material such as quartz, which has high heat resistance and excellent heat conduction for supporting 4 in the heating chamber 1. 6 is a tubular body having a height (depth) T formed at the same potential as the heating chamber metal wall 2 by squeezing the heating chamber metal wall 2 portion through which the electric heater wire 4 penetrates by burring. , 7 are through-holes opened by passing through the heating chamber 1 by forming the tubular body 6. Both ends of the heater support tube 5 are inserted into and supported by the through holes.

The electric heater wire 4 is formed in a coil shape in the entire section between the left and right metal walls 2 and 2 of the heating chamber, but what is important here is that the portion located inside the cylindrical body 6 is always required. That is, the coil part 8 is formed by being wound by a coil, and at least one turn of the coil is always accommodated in the tubular body 6.

Reference numeral 9 denotes a heater wire support member composed of a heat-resistant insulator or the like for insulating and fixing the electric heating heater wire 4 penetrating the heating chamber metal wall 2 portion, that is, the tubular body 6, from the heating chamber metal wall 1.
Reference numeral 0 is a fixing member for fixing the heater wire support 9 to the heating chamber metal wall 2. The portion of the electric heater wire 4 that penetrates the tubular body 6 and the portion 11 that is supported by the heater wire support 9 supply heater power to the electric heater wire 4 inside the heater support tube 5. The function as a power supply line is provided.

Since the embodiment of the present invention is constructed in this way, the burring cylinder 6 and the coiled electrothermal heater wire 4 penetrating therethrough form a coaxial transmission line. Therefore, the high-frequency energy inside the heating chamber does not leak to the outside of the heating chamber therethrough.

In the above embodiment, the heater wire having a heat generating function is directly extended as the electric wire material of the portion which penetrates the tubular body 6 of the metal wall 2 of the heating chamber and is supported by the heater support 9. I explained by taking up the case of using
Needless to say, the use of a normal lead wire, that is, a normal power supply dedicated line, is not limited to that portion. .

[0013]

As described above, according to the present invention, the cylindrical body attached to the metal wall of the heating chamber and having the same electric potential as that of the tubular body and the coil-shaped electric wire penetrating therethrough do not form a coaxial transmission line. It is possible to provide a safe and low-cost high-frequency heating device that can exhibit an excellent electromagnetic wave leakage prevention effect under an extremely simple structure without using a complicated structure such as a conventional choke structure. .

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a high-frequency heating device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Heating chamber metal wall 3 Electric heating grill heater 4 Electric heating heater wire 6 Cylindrical body 7 Through hole 8 Coil part 9 Heater support tool 11 Power supply wire

Claims (1)

[Claims] 1. A heating chamber (1) formed by metal walls (2, 2, ...) For heating food by high-frequency energy, and an inside of the heating chamber for heating food by electrothermal energy. And an electric heating wire (4) attached to the electric heating wire (4) for supplying electric power to the electric heating wire from the outside of the heating chamber, the electric power supply wire (11) having a coil portion (8) formed in a part thereof. ), A through hole (7) opened in the heating chamber wall for penetrating the power supply line, and the electric power which is attached to the heating chamber metal wall portion having the through hole at the same potential. A high-frequency heating device, comprising: a metal tubular body (6) which surrounds and penetrates at least one turn of a coil portion of a supply line.