JPS63223429A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To prevent high-frequency energies from leaking outward by positioning at least one turn of coil-shaped heater wires in the thickened part of a link surface of the wall surface of a heating chamber, and setting the length of an inclined side of the coil at a value sufficiently shorter than the working wavelength. CONSTITUTION:In a heating chamber 1, high-frequency energies of a wavelength lambdaare sealed to subject a food to dielectric heating, and the food is externally heated by heater wires 3 of a grill heater 5. Support tubes 4 support the heater wires, and at least one turn of the coil-shaped heater wires 3 is located within the height T of a link provided outside a heating chamber wall surface 2. That is, the one turn is constituted as an oblique side R in which the coil of the heater wire 3 is inclined. When the inclination angle made by the base P of a triangle and the side R is represented by H, T>P and R<<lambda, Hnot equal to 0 deg. and Hnot equal to 180 deg.. Thus, the heating chamber wall surface 2 and the heater wires 3 do not constitute a coaxial transmission line and show no radiation characteristic in the outside direction of the heating chamber 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a structure for preventing leakage of radio waves from a grill heater terminal having a coiled heater wire in a high frequency heating device that employs a combined heating method using high frequency energy and a heater as a heating source. Regarding.

Conventional technology Conventional high-frequency heating equipment employs a composite heating method that heats food externally by installing a grill heater with a coiled heater wire inside a heating chamber that introduces high-frequency energy to dielectrically heat food. The thing is Japanese Patent Publication No. 59-13442
No. 7, JP-A-59-150221, etc.

Problems to be Solved by the Invention According to the above configuration, the part of the coiled heater wire that penetrates the heating chamber wall is a coaxial transmission line that can be considered as the heater wire or the center conductor, and the heating chamber side wall or the outer conductor. Therefore, in order to prevent high-frequency energy from leaking to the outside of the heating chamber, it is necessary to construct a choke at the part where the heater wire penetrates the heating chamber wall, and this choke structure is not only complicated, but also requires sufficient sealing. There was a problem that no effect could be obtained.

Means for Solving the Problems The present invention has been made in order to eliminate the above-mentioned drawbacks, and includes a link formed by drawing on the outside of the heating chamber wall through which the coiled heater wire penetrates, and which also penetrates through the heating chamber wall. A right-angled triangle in which at least one turn of the heater wire is provided in a coil shape with a pitch apart from the coil and is located within the thickness of the link surface, and the coil of the heater wire is configured as an inclined hypotenuse R. At the base P adjacent to this hypotenuse R and the height T of the link, TAP and R
The following relationships are satisfied: <<in, θ≠O', and 0≠1806. However, e indicates the angle between the hypotenuse R of the right triangle formed by the inclined side R of the heater wire coil and the adjacent base P, and the input is the wavelength input = 12
It is 2mm.

Effect By configuring as described above, since no heater wire or coaxial transmission line is formed between the heating chamber wall surface and the heater wire passing through the wall surface,
No high frequency energy leaks to the outside.

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

The configuration of the embodiment is as shown in FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a heating chamber, which is constructed of a metal plate, and is designed to dielectrically heat food by sealing in high-frequency energy. The heating chamber wall surface 2 is formed into a coil shape by penetrating this,
A grill heater 5 having heater wires 3 with coil pitches spaced apart is also provided to externally heat food (not shown). A link 6 formed by squeezing the heating chamber wall surface 2 is provided on the outside of the heating chamber wall surface 2 through which the heater wire 3 passes. The outer periphery of the heater wire 3 is supported by a cylindrical heater support tube 4 made of a material that is highly heat resistant and has excellent heat conduction, such as quartz. - such that the turns are located within the height T of the links 6 provided on the outside of the heating chamber wall 2; In other words, when considering a right triangle in which the coil of the heater wire 3 in FIG. 2 is formed as the inclined hypotenuse R, the base P of the right triangle
And if e is the inclination angle made by the above hypotenuse R, then P=
It is expressed as RcosO, and the height T of the link 6 provided on the outside of the heating chamber wall surface 2 is T>P, and the relationship R<<in, 0+O', 0#180° is maintained. . Where, input is the wavelength of the high frequency used, input =
It is 120mm. 7 has high heat resistance for separating and supporting the heater wire 3 having a coiled shape and the heater wire 3 formed parallel to the axial direction of the through hole in the heating chamber wall surface 2;
For example, it is a heater fixture made of insulator or the like.

Next, the action of this example consisting of ``-'' structural acid will be explained.

The height of the link 6 provided on the outside of the heating chamber wall surface 2 is T, and the base P of the right triangle formed as the inclined side R of the heater wire 3 is the height T of the link 6. , let T>P, and R<<in, ego
' , 0*180' 0) If the relationship is satisfied and at least one turn of the coiled heater wire 3 with the coil picks separated exists within the surface of the link 6, the heating chamber wall surface 2 and the heater wire 3 Moreover, in consideration of the theory of helical antennas, radiation characteristics can be maximized in the axial direction of the coiled heater wire 3, that is, in the outward direction of the heating chamber 1.

Effects of the Invention As described above, according to the present invention, a grill heater having a coil-shaped heating wire with a spaced coil pitch is provided in a heating chamber that confines high-frequency energy to heat food by penetrating the heating chamber wall surface. When provided, the relationship between the height T of the link from the heating chamber wall surface and the base P adjacent to this hypotenuse of a right triangle formed as the inclined hypotenuse R of the coil of the heater wire is T>P, and R< ＜In, e≠0°, e+180°, and at least one turn of the coiled heater wire exists within the link surface, so that the heater wire and the heating chamber wall surface are connected to the outside. Since there is no leakage of high-frequency energy, there is no need to construct a choke for the heater like in the past, and the leakage of high-frequency energy can be prevented with a simple configuration, making it possible to provide a safe and low-cost high-frequency heating device. It's effective.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of a main part of a grill heater portion of a high-frequency heating device showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a negative winding portion of a coil-shaped grill heater. l... Heating chamber 2... Heating chamber wall surface 3... Heater wire 5... Grill heater 6... Link

Claims (1)

[Claims] A grill heater (5) consisting of a metal heating chamber (1) for dielectrically heating food by introducing high frequency energy, and a coiled heater wire (3) provided through this heating chamber (1). ), the heater wire (3)
A link (6) is provided on the outside of the heating chamber (1) by drawing out the heating chamber wall surface (2) through which the heating chamber wall (2) is penetrated, and at least one turn of the heater wire (3) is formed into the above-mentioned coil shape and the pitch between the coils is separated. The link (6) is located in the plane and the base P adjacent to the hypotenuse R of a right triangle constituted by the inclined side R of the coil of the coiled heater wire 3 and the link (
6) at the height T, T>P, R<<λ, Θ≠0°
, Θ≠180° (where Θ indicates the inclination angle between this hypotenuse R of the heater wire and the adjacent base P of the right triangle having the hypotenuse R. λ is the wavelength, and λ = 122 mm. A high-frequency heating device characterized in that it is equipped with a grill heater (5) having a structure that satisfies the following relationship.