JPH0125511Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to microwave ovens, and more particularly to the attachment of waveguides to oven walls.

<Prior Art> Conventionally, a waveguide is attached to an oven wall by attaching a mounting piece that extends outward from the attachment surface of the waveguide to the oven wall, superimposing it on the oven wall, and then spot-welding the mounting piece to the oven wall. The waveguide conduit wall located between the waveguide conduit and the space inside the oven and the oven wall were fastened together with screws. This connection between the conduit wall and the oven wall is a measure to prevent radio waves from leaking from the radio wave exit section. It had to be tightened with screws.

Tightening screws from inside the oven not only has poor work efficiency, but also leads to loose screws or incomplete screw tightening, which can lead to quality defects such as radio wave leakage.

<Purpose> The present invention has been developed in view of the above, and is a method of providing an electrode insertion hole for spot welding in the conduit wall of a waveguide.
By spot welding the conduit wall facing the electrode insertion hole to the oven wall, the purpose is to improve assembly workability and reduce quality defects due to leakage of radio waves.

<Example> Hereinafter, an example of the microwave oven of the present invention will be described based on the drawings. FIG. 1 is an external perspective view of an assembly in which a waveguide is attached to the oven wall of a microwave oven according to the present invention, and FIG. 2 is a sectional view taken along line A-A' in FIG.

In the figure, 1 is an oven that houses the object to be heated, and 2 is a waveguide that guides high-frequency radio waves generated by a high-frequency radio wave generator (not shown) such as a magnetron to the oven 1, as shown in FIG. A waveguide is constructed by overlapping a flange-shaped upper waveguide plate 2a made of a metal plate such as a galvanized steel plate and a flat waveguide lower plate 2b, and caulking or spot welding their peripheral edges. 3 is formed. The lower waveguide plate 2b is provided with a radio wave outlet 2c and a radio wave inlet 2d, which are entrances and exits for high-frequency radio waves. The flange 2f is spot welded and attached to the ceiling wall 1a of the oven 1. Further, the waveguide upper plate 2a includes a radio wave outlet edge 2g of the waveguide lower plate 2b located between the conduit 3 of the waveguide 2 and the space 4 in the oven 1, and the ceiling wall of the oven 1. An appropriate number of electrode insertion holes 2h, 2h, 2h are provided for spot welding to the radio wave intake edge 1c of the waveguide lower plate 2b, and the radio wave outlet edge 2g of the waveguide lower plate 2b and the radio wave intake of the oven 1 are connected to each other. The entrance edge 1c is spot welded to prevent radio waves from leaking through the gap at that part.

Fig. 3 is a cross-sectional view taken along line B-B' in which the electrode insertion holes 2h, 2h, 2h in Fig. 1 are changed from flat holes to cylindrical holes. This is intended to reduce radio wave leakage from the electrode insertion holes 2h, 2h.2h. According to experiments, the a dimension of the cylindrical hole was φ8 mm,
When the b dimension is set to 2.5 mm, the radio wave leakage is due to the water load.
0.01 [mW/cm ² ] at 275c.c., 0.1 [mW/cm 2 ] at no load
cm ² ], the leakage of radio waves is reduced to 1/30 compared to when using a flat hole of φ8 mm.

In addition, the shape and size of the electrode insertion hole 2h.2h.2h,
The number of members, positions, etc. are not limited to the embodiments described above and illustrated.

<Effects> The present invention provides a microwave oven in which a waveguide is attached to the oven wall by spot welding, an electrode insertion hole for spot welding is provided in the waveguide conduit wall, and the conduit opposite to the electrode insertion hole is provided with an electrode insertion hole for spot welding. By spot welding the wall to the oven wall, assembly workability is improved compared to the conventional method of tightening that part with screws, and it has high practical value as it can reduce quality defects due to radio wave leakage. It is something.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of the assembly in which a waveguide is attached to the oven wall of the microwave oven of the present invention, and Figure 2 is the
FIG. 3 is a sectional view taken along line A-A' in the figure, and FIG. 3 is a sectional view of a main part of another embodiment of the present invention. Code, 1...Oven, 2...Waveguide, 2h...
...Electrode insertion hole, 3... Waveguide path.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a microwave oven in which a waveguide is attached to the oven wall by spot welding, an electrode insertion hole for spot welding is provided in the conduit wall of the waveguide, and the electrode insertion hole is opposed to the microwave oven. A microwave oven characterized by having a conduit wall spot welded to an oven wall. 2. The microwave oven according to claim 1 of the utility model registration, characterized in that the electrode insertion hole is a cylindrical hole.