JPS5843874B2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The purpose of the present invention is to provide a method for easily fixing curved waveguides with screws. According to this method, even complexly curved waveguides can be easily assembled, so that they can be integrated into one piece. There is no need to create a waveguide, which saves materials and improves the workability of waveguide manufacturing.

Conventionally, waveguides were connected by connecting waveguide flanges with screws, as shown in Figure 1.

This method was effective when the waveguide was not bent, but when the waveguide was bent as shown in Figure 2, the workability when tightening the screws became extremely poor.

The present invention uses screws that are longer than the height of the waveguide, so that it can be used not only for straight waveguides but also for curved waveguides, without deteriorating the waveguide characteristics. To provide a high frequency heating device which can be assembled from all directions, and in which no screws fall into the waveguide, and no discharge occurs between the screws and the waveguide due to high frequency electromagnetic waves.

A high frequency electromagnetic wave from a magnetron 1, which will be explained below with reference to FIGS. 3 and 4, which are one embodiment of the present invention, passes through a waveguide 2 and enters a heating chamber 3 to heat an object to be heated (not shown).

Here, 4 is a door and 5 is a knob.

The high frequency oscillator is located below the heating chamber 3, and when the high frequency electromagnetic wave feed port 6 or above the heating chamber 3, the waveguide 2 is
Becomes letter-shaped.

The L-shaped waveguide 2 is difficult to make as a single component, and if it is made, it is difficult to extract material from the iron plate, resulting in high material costs. It's also difficult to do.

Therefore, a method of coupling with screws at the corner portions of the L-shaped waveguides has been considered, but as shown in FIG. 2, the assembly work becomes difficult.

Therefore, by making a small hole 9 in the outer H surface 8 and coupling the inner H surface 7 of the single-shaped waveguide, and coupling the inner H surface from the outer H surface side, the workability is dramatically improved.

Since the length L of the screw 10 is larger than the dimension B of the waveguide, the screw 10 does not fall into the magnetron 1.

Further, since only the screw heads are exposed inside the waveguide, the properties of the waveguide are not deteriorated, and since there is a small hole 9 in the outer H surface 8, there is no leakage of radio waves from the small hole.

Although the above explanation has been made using a curved waveguide, it goes without saying that the coupling method shown in FIG. 4 may also be applied to a straight waveguide.

As explained above, according to the present invention, the following effects can be expected.

(1) Workability is good because two waveguides can be coupled from the same direction.

(2) Since the length of the screw inside the waveguide is longer than the width of the waveguide, it is difficult for the screw to enter the waveguide during work.

(3) Since only the screw head is inside the waveguide, the characteristics of the waveguide will not deteriorate.

(4) Since the small hole is simply opened in the waveguide wall, there is no leakage of radio waves from the small hole.

(5) Since it is easy to obtain materials when manufacturing the waveguide, material resources can be saved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a waveguide showing a conventional example, FIG. 2 is a cross-sectional view of a main part of a conventional example of assimilation, and FIG. 3 is a cross-sectional view of a high-frequency heating device showing an embodiment of the present invention. 4 is an exploded perspective view of the main part of FIG. 3, and FIG. 5 is a sectional view of the main part of another embodiment of the present invention. 1... Magnetron, 2... Waveguide,
7...Outer H surface, 8...Inner H surface, 1
0...Bis.

Claims (1)

[Claims] 1. A heating device includes a heating chamber, a high-frequency oscillation device that generates high-frequency electromagnetic waves, and a waveguide that sends the high-frequency electromagnetic waves of the high-frequency oscillation device to the heating chamber, and the waveguide is a heating chamber side waveguide. In a high-frequency heating device comprising a waveguide on the high-frequency generator side and a high-frequency generator-side waveguide, the two waveguides are coupled by a screw, and the coupling screw on the H-plane of one of the waveguides is connected to the other waveguide from the inside of the waveguide. The high-frequency heating device is fastened with screws through small holes in the H side of the waveguide, and the length of the coupling screw is longer than the height of the waveguide.