JPS60248920A - High-frequency heating appratus - Google Patents

Abstract

PURPOSE:To enable to take extremely large volumetric capacity for a heating chamber in comparison with the whole size of a heating apparatus, by molding a shell body from a single sheet of metal plate, and by partitioning the inside into a heating chamber and a power section. CONSTITUTION:A front panel 1 has an opening 4 for putting in and out of a material to be heated, and an opening 5 for fitting an operating panel. A freely opened door is fitted to the opening 4 so as to cover it. A shell plate comprises a ceiling plate 6, a left side panel 7, a right side panel 8, a bottom plate 9, and a bulkhead 10. All of them are molded of a sheet of metal plate in the shape as shown in the figure, and are jointed to the front panel 1 and a back panel 2. Partitioned by the bulkhead 10, the left space is to be a heating chamber, while the right space will be a power section 12 in which electric parts including a high-frequency generator are housed. Jointing is made by clouble-seaming, which is to be applied to the whole periphery of a shell plate with the front and back panels 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating chamber of a high-frequency heating device such as a microwave oven and a structure of a housing portion thereof.

Conventional configurations and their problems Conventionally, in high-frequency heating devices such as microwave ovens, the interior of the heating chamber is painted after it is formed, or is constructed using a highly corrosion-resistant material such as a stainless steel plate. Generally, the external material for the heating chamber is a U-shaped bent steel plate made from a painted steel plate or the like and placed over the heating chamber. In such a configuration, a gap was created between the heating chamber wall (including the ceiling and bottom) and the external material, which led to a decrease in the ratio of the effective volume of the heating chamber to the total volume of the device. .

Of course, these spaces are used to install insulation materials and various mechanisms, but widening the heating chamber has the advantage of increasing the amount of food cooked, which in turn shortens the cooking time. However, there is a drawback that the installation area and space occupied by the device also increase accordingly.

In some heating devices, the external material and the heating chamber are partially constructed of a single metal plate, but since the joining method is by spot welding or screw tightening, the outer surface is exposed. It is not appropriate to do so, and therefore the construction has been continued in which these joints are locally covered with decorations, covers, etc., which results in an increase in the number of parts and a zero-value product.O Invention OBJECTS OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a high-frequency heating device having a configuration that can extremely increase the effective volume of the heating chamber with respect to the total volume of the device. The aim is to reduce the cost by making the product lighter and lighter.

Structure of the Invention In order to achieve the above object, the high-frequency heating device of the present invention includes a front plate having an opening for putting in and taking out the heated object with a door that can be opened and closed, an operation panel, a back plate of the main body, and an external part of the main body. and a body whose top, bottom, left and right sides are formed from a single metal plate, and the front end of the body, the periphery of the front plate, the rear end and the periphery of the back plate are each joined by seaming. At that time, the shape of the body plate was approximately ``'' shaped, with the top, bottom, left and right sides of the main body, as well as the left and right side walls and partition plates running parallel to each other.
One side is used as a heating chamber, and the other side is used as an electrical chamber for storing electrical control parts. According to this configuration, the number of parts is extremely small, the weight can be reduced, and the cost is low.

In addition, as another shape of the body plate, the left, right, top and bottom are shaped like a "mouth" shape, and a partition plate is separately added to separate the heating chamber and the electric chamber, which has the effect of simplifying the processing process.

As above, tighten the body plate and front plate, as well as the body plate and back plate,
The other end faces must be joined. In that case, you can easily finish the painted copper plate by preparing the welding part and the welding jig contact area in advance without printing a coating film, and then bending the plate to form it and welding it. This has the effect that it can be done.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention in a state before joining.

1 is a front plate, 2 is a main body back plate, 3 is a body plate, and the front plate, 1
It has an opening 4 for putting in and taking out the heated object and an opening 5 for operation and installation of a tunnel, and a door (not shown) that can be opened and closed is installed so as to cover the opening 4. The body plate is on the ceiling surface 6
, a left side surface 7, a right side surface 8, a bottom surface 9, and a partition plate 10, which are formed by a single metal plate as shown in FIG.
After forming it into a square shape, it is joined to the front plate 1 and the back plate 2.

The space to the left of the partition plate 10 serves as a heating chamber 11, and the space to the right serves as an electrical chamber 12 for storing electrical components such as a high frequency generator.

Each of the front plate 1 and the back plate 2 is formed into a shallow box shape, and is attached so that the portion corresponding to the bottom faces the inside of the body plate 3 at the time of joining.

Note that 13 is a window that is used for installation of electrical components, wiring work, and repairs, and is covered with a lid after the electrical components are installed.

The joining is done by seaming around the entire circumference of the body plates both at the front and rear.

As shown in the example shown in Figure 3, the front plate 1 has a flange part 16 on the end surface of the body plate, and the front plate 1 has a flange part 16 that abuts on the seven rungs 16 with the box-shaped bottom 19 inside. Starting from (-), tighten as shown in Figure 3(b).

Next, the connection between the partition plate 1o and the ceiling surface, and the connection between the right bottom surface 9 and the partition plate 10 will be described.

Their joints are made using a method called glojection welding. This method utilizes the property that the resistivity of all layers increases as the temperature increases. In other words, a projection is created at the joint of the workpiece, brought into contact with the surface of the workpiece, and a large current is passed for a short period of time.The resistance heat (Joule heat) is used as a heat source to melt the metal. This is a method of joining by applying pressure when the material approaches a point or reaches a molten state. The feature of this welding method is that it can be welded efficiently and in a short time without damaging the painted surface.

As shown in FIG. 4, the areas 12a, 12b, and 6a that are not welded are calculated in advance when the sheet is in the form of a sheet.

9a forms a painted steel plate with no paint film on it, and as shown in FIG.
and 6a, welding is performed using electrodes A and B of the welding machine and pedestal C, and when welding is performed at locations 12b and 9a, welding is performed using electrodes A' and B' and pedestal C'. An enlarged view is shown in FIG. A progeexion P is provided at the tip of the point 12a, and a current flows from the electrode A through the progeexion P, through the metal point 6a, and to the electrode B, melting the progeexion P and,
Pressure is applied by electrode A, and points 12& and 6a are not joined.

The same applies to portions 12b and 9a.

Next, FIG. 7 shows another embodiment of the body plate structure.

The ceiling surface 6 (consisting of the left side 7', right side 8', and bottom 9', is formed from a single metal plate in the shape of a "gut"), and the partition plate 14 is a separate part indicated by the two-dot chain line. After that, the front plate 1 and the back plate 2 are joined by seaming, and the partition plate 14 is attached to the position shown in FIG. It is carried out in the same way as shown in the figure.

According to the above two embodiments, the heating chamber 11 and the electric chamber 1
The wall material composing part 2 also serves as an external material,
There is an advantage that no extra space is required and the effective volume of the heating chamber 11 can be made extremely large relative to the external shape of the main body. At the same time, the number of component parts is reduced, and the strength of the casing can be ensured by seaming, which allows the use of thinner materials, leading to weight reduction. In addition, since the spot welding is performed without applying a coating film to the parts to be spot welded at the material stage before forming the heating chamber 11, the strength of the spot welding is sufficient and the spot work can be carried out smoothly. There is.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) The body plate is constructed from a single metal plate, and the inside is a heating chamber and an electric chamber, and the outside is the outside of the main body of the device, so that the volume of the heating chamber can be made extremely large relative to the external dimensions.

(2) The main body of the device and the heating chamber have a single-plate structure, which reduces weight.

(3) Since the structure is made by seaming, the casing is extremely strong, and since the entire circumference is evenly bonded, there is no need to worry about high frequency leakage.

(4) Projection welding is used for areas that cannot be tightened, and since the areas are coated with painted copper plates without a coating, the welding is finished neatly, without damaging the coating on the spot surface appearance, and can be painted later. The work process can be significantly shortened and the finishing process can be completed without any problems.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the casing structure of an embodiment of the present invention before seaming, Fig. 2 is a state diagram showing the structure of the body plate, and Fig. 6 shows the body plate without a partial coating film. A sectional view showing the processing and assembly state,
Fig. 6 is a partial sectional view for explaining welding, Fig. 7 is a perspective view of the body plate configuration of another embodiment, and Fig. 8 is a sectional view showing the body plate assembly state of Fig. 7 without partial coating. be. 11'...Front plate, 2...Back plate, 3...
...Body plate, 4...Opening, 6...Ceiling surface, 7...Left side, 8...Right side,
9...Bottom surface, 11...Heating chamber, 12.
·····power room. Fig. 1 2 2-33 Fig. 4 Fig. 5 Fig. 6 Fig. 7 t' Fig. 8 6'9'/4

Claims (1)

[Scope of Claims] (1) A heating chamber for storing an object to be heated, and a door provided in an opening of the heating chamber so as to be openable and closable, and the material forming the heating chamber is at least the inner surface of the heating chamber. A high-frequency heating device in which the coating surface has been pretreated, only the dimensions of the welding surface and welding jig are not coated, and the non-coated surface is a surface other than the inside of the heating chamber. (2) Claim 1, in which a non-coated surface is arranged on the inner surface of an electrical chamber that houses electrical components such as a high-frequency generator, etc.
The high-frequency heating device described in Section 1. (3) Each part of the partition plate that runs parallel to the top, bottom, left and right sides of the heating device main body, as well as the left and right side walls, is made of a single metal plate.
heating one side with the partition plate as a border,
The high-frequency heating device according to claim 1, wherein the other side is an electric chamber for storing electrical components such as a high-frequency generator. (2) The top, bottom, left and right sides of the heating device main body are made of copper plates made of a single metal plate, and are formed into a shape of a "mouth". The high-frequency heating device according to claim 1, wherein the high-frequency heating device is configured to include a partition plate that separates the electrical chamber from the electrical chamber for storing electrical components. (5) The peripheral edge of the front plate that forms the heating chamber, the front end of the body plate that forms the top, bottom, left and right sides of the heating chamber from a single metal plate, the peripheral area of the back plate of the heating chamber, and the rear end of the body plate, respectively. The high-frequency heating device according to claim 1, which is configured to be joined by seaming.