JPS587134B2 - Microwave oven with oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to enamel the heating chamber of a microwave oven having a hot air circulation type oven function.

Recently, microwave ovens with oven functions have become available,
Two major shortcomings are highlighted.

One of them is that sheathed heaters are installed on the upper and lower walls of the heating chamber, which reduces the effective volume of the heating chamber and makes cleaning the inside of the heating chamber very difficult.The other is that the heating chamber is made of stainless steel. The room was very dirty,
Also, dirt is difficult to remove.

This electric oven uses a stainless steel heating chamber, but the heating chamber is double layered, and the inner side is removable and can be washed.

Additionally, gas ovens are generally treated with enamel, which makes stains less noticeable.

Double scrubbing the heating chamber of a microwave oven is not possible due to the problem of sparks caused by radio waves, so the solution to the above two drawbacks is to enamel the heating chamber, insert the heater into the auxiliary heating chamber, and force circulation of hot air. I can't think of a way to do that.

This method is also considered to be extremely effective when using gas as a heat source.

However, this method has a major problem. In Figure 1, the heating chamber back plate 2 separates the heating chamber wood body 1 from the auxiliary heating chamber 3, allowing hot air to pass through and blocking radio waves. The best would be something like 澾子/子I.

If the heating chamber main body 1 and the heating chamber back plate 2 are now integrated by spot welding or the like and then enameled, the small holes will become clogged with the enamel.

FIG. 3 shows an example of the arrangement of the small hole groups, and this is the arrangement that will not cause any practical radio wave leakage and will have the highest aperture ratio.

As a method of enamel treatment, a method called jabbing, in which the enamel is immersed in enamel liquid, is common and has high productivity, but the arrangement shown in Figure 3 causes clogging.

This can be improved somewhat by reducing the diameter of the hole to about φ8, but the leakage of radio waves will increase, so the aperture ratio needs to be reduced.

This can be improved by applying the enamel liquid by spraying instead of by applying it, but productivity will be extremely poor in a box like a heating chamber.

The invention is to separate the heating chamber main body 1 and the heating chamber back plate 2 so that they can be individually enameled.

An embodiment will be described below with reference to the drawings.

The heating chamber main body 1 is made by bending a 0.8 mm thick iron plate into a rectangular tube shape, and the heating chamber back plate 2 is also a 0.8 mm thick iron plate with punched holes, and the hole arrangement is as follows. Figure 3 shows this.

The auxiliary heating chamber 3 is made by pressing a 0.8 mm thick aluminized steel plate into a truncated pyramid shape.

Inside, a sheathed heater 5 fixed with an insulator 4 and a fan 6 made of an aluminum plate are arranged.

FIG. 2 is a sectional view showing a portion where the heating chamber body 1, the heating chamber back plate 2, and the auxiliary heating chamber 3 are in contact with each other.

The width of the entire outer circumference of the truncated pyramid-shaped squeezer in the auxiliary heating chamber 3 is 20 m.
A flat part 7 of m length is provided, and the entire outer circumference of the flat part 7 is squeezed to form a bent part 8, and the height of the bent part is set to 10 mm.

On the non-working side of the heating chamber, the flat part 9, outer bent part 10, and inner bent part 11 are integrally formed by drawing, and the inner and outer bent parts 1o and ii, which are attached to the heating chamber body by spot welding, are both high. The length is 10 mm.

Both the heating chamber main body 1 and the heating chamber back plate 2 are enameled to a thickness of about 150 μm.

A hole 12 of φ4.5 is made in the flat part T of the auxiliary heating chamber 3,
Drill a φ613 hole in the corresponding position on the heating chamber back plate 2, and a φ2.914 hole in the corresponding position in the flat part 9 of the heating chamber main body 1, and remove these three from the auxiliary heating chamber side with a 4mm screw pin. Fix it.

These pin screws were used at intervals of 75 mm in non-experimental examples.

In Figure 1, parts such as the front plate of the heating chamber facing the door, which should naturally be present, are excluded, and only the area around the back plate of the heating chamber, which is the main purpose of the invention, is shown. These are a square window 15 for introducing high frequency waves, and a truncated conical aperture section 16 for rotating the turntable.

With the above configuration, a heating chamber of a microwave oven with a hot air circulation type oven function is completed.

This heating chamber is enamel-treated, so dirt is not noticeable and stains are easily removed.

Also, since it uses a hot air circulation method, there is no heater inside the heating chamber, so there is no reduction in the effective volume of the heating chamber, and it is easy to clean.

Since the heating chamber has a separated backing plate with many punched holes, it is possible to use highly productive shingling, and the backing plate can be produced using a spraying method without clogging the punched holes.

The punched holes can have the highest aperture ratio allowed in terms of radio wave leakage.

Further, the heating chamber back plate 2 is warped and distorted due to punching and enamel processing, but the heating chamber back plate 2 is not easily damaged by being sandwiched between the flat parts 7 and 9.

Since the flat portions 7 and 9 have bent portions integrally formed by drawing, the flatness remains at a sufficiently small value.

The width L of the flat part was set to 20tt in this example, but in experiments, radio wave leakage was measured by changing L to 10.20 and 30.40. Even when added, it did not exceed 2 mW/cr2 in all cases.

In each experiment, the radio wave leakage was large, not from a fixed point, but from one or two random points.

Even at this position, the power does not exceed 2 mW/Cm2.

Needless to say, if a food table or food is placed inside the heating chamber, this value will drop significantly.

According to the above-mentioned Yokofu invention, the heating chamber main body and the auxiliary heating chamber have an enamel-treated back plate that has a flat part with a width of about 10 mm to 40 mm around the entire circumference, and has the effect that dirt is not noticeable and cleaning is easy. Since it has a sandwiched structure, it has excellent effects such as being able to prevent radio wave leakage from this part to the extent that it becomes a practical problem.

Furthermore, since the back plate reliably filters or cuts off radio waves, it can be used in a wide range of applications, including the ability to use gas as a heat source.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a heating chamber of a microwave oven with an oven, showing an embodiment of the present invention, and Fig. 2 is a cross-sectional view of the main part of the heating chamber, the auxiliary heating chamber, and the part where the heating chamber back plate contacts. , FIG. 3 is a diagram showing the arrangement of holes (punched holes). DESCRIPTION OF SYMBOLS 1...Heating chamber body, 2...Heating chamber back plate, 3...Auxiliary heating chamber, 7...Plane part, 9...Plane part, 8...
Bending part, 10... Bending part, 11... Bending part.

Claims (1)

[Claims] 1. It has a heating chamber body that has been enameled, a heating chamber back plate that has been enameled, and an auxiliary heating chamber, and the entire circumference of the heating chamber body and the part that contacts the heating chamber back plate of each of the auxiliary heating chambers. A microwave oven with an oven, comprising: a flat part, bent parts on the outside and inside of the flat part, and a width of the flat part ranging from 10 mm to 40 mm.