JPS60248929A - High frequency heater - Google Patents

Abstract

PURPOSE:To provide a simple and strong casing by forming the outer shell of the main body with a single metal plate, and by attaching thereto the front plate and back plate by double-seaming. CONSTITUTION:The shell plate 3 comprises top plate 6, left side plate 7, right side plate 8, bottom plate 9 and separator plate 10. They are formed wih a single metal plate in the shape as shown in the figure, and is completed thereafter by attaching front plate 1 and back plate 2. The front plate 1 and back plate 2 are respectively formed in a thin box. For attachment, a part of them that amounts to the bottom is positioned to face the interior of the body shell 3. The attachment is performed by double-seaming all around the body shell 3 on both the front and rear sides.

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 related thereto.

Conventional structure and its problems Conventionally, in high-frequency heating devices such as microwave ovens, the force n
After forming the heat chamber, the inside is painted or constructed using a highly corrosion-resistant material, such as a stainless steel plate,
Generally, the outer shell of the device is a U-shaped bent steel plate made of a painted steel plate, which is placed over the heating chamber. In such a configuration, a gap is created between the wall surface of the zero-force heating chamber (including the ceiling surface and the bottom surface) and the outer shell, which leads to a decrease in the ratio of the effective volume of the heating chamber to the total volume of the device. was.

Of course, these gaps f are used as places to install heat insulating materials and various mechanisms, but enlarging the heating chamber has the advantage of increasing the amount of food cooked and ultimately shortening 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 outer shell and the heating chamber are partially constructed of a single metal plate, but the outer surface is exposed as a result of joining by Nubonoto welding or screw tightening. This is not appropriate, and therefore these joints are locally covered with decorations, covers, etc., resulting in an increase in the number of parts and an increase in cost.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to provide a high-frequency heating device having a configuration in which the effective volume of the heating chamber can be extremely large relative to the total volume of the device, and in addition, the casing portion thereof can be simplified. The aim is to reduce costs 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 and an operation panel, a back plate of the main body, and upper and lower parts of the outer shell of the main body. A body plate and a frame whose left and right sides are formed from a single metal plate, and the front end of the body plate and the periphery of the front plate, and the rear end and the periphery of the back plate are joined by seaming. In this case, the shape of the body plate is 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, with one side housing the power and heat chamber and the other housing the electrical control components 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 upper and lower sides of the body plate are formed into a substantially "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.

The seaming of the above-mentioned body plate, front plate, and back plate is done outward, which simplifies the seaming processing equipment.
It is possible to create a structure that is not unreasonable for the materials used, and on the other hand, by turning the windings inward, the unevenness of the winding portion is placed inside the body plate, reducing the protrusion of the outer surface and improving the aesthetic appearance. Become what you have.

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 the state before joining of an embodiment of the present invention. 0 1 is a front plate, 2 is a main body back plate, 3 is a body plate, and the front plate 1 is used for taking in and taking out heated objects. It has an opening 4 and an opening 5 for attaching an operating knob, and a door (not shown) that can be opened and closed is attached to cover the opening 4. The body plate 3 consists of a ceiling surface 6, a left side surface 7, a right side surface 8, a bottom surface 9 and a partition plate 10, which are made of a single metal plate and are shaped like the letter ``no'' as shown in FIG. After that, the front plate 1 and the back plate 2 are joined.

In FIGS. 2 and 3, 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 when joined.

Reference numeral 13 is a window for installing electrical parts, wiring work, and repairs, and the lid is covered after installing electrical parts.

The joining is performed over the entire circumference of the body plate 3 both at the front and the rear by seaming.

Fig. 3 shows another embodiment of the body plate structure, which is composed of a ceiling surface 6a, a left side surface 7a, a right side surface 8a, and a bottom surface 9a, and is formed in a substantially mouth shape with a single metal plate. The plate 14 is attached as a separate component at the position indicated by the two-dot chain line, and is then joined to the front plate 1 and back plate 2 shown in FIG. 2 by seaming.

According to the two embodiments described above, the wall material constituting the heating chamber 11 and the electrical chamber 12 also serves as the outer shell material, and there is no need for extra voids, and the effective volume of the heating chamber 11 is reduced by the outer diameter of the main body. It has the advantage that it can be made extremely large. 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.

The drawings from FIG. 4 to FIG. 10 are sectional views showing the seaming method, and in each case, figure a is a sectional view before seaming, and figure a is a sectional view after seaming.

In FIG. 4a, the body plate 3 has a flange portion 15 on its end face, and the front plate 1 has a flange portion 16 that abuts the flange portion 15 with the box-shaped bottom portion 1a inside. Note that the back plate 2 also has a similar structure, and the explanation will be omitted since it is redundant. The same applies to the following examples. The flange portion 16 of the front plate 1 extends further outward than the height of the flange 15 of the body plate 3, and its tip is bent slightly inward. It is bent to the position shown by the two-dot chain line so as to embrace the portion 15, and then bent outward once again along with the flange portion 15 of the body plate 3, resulting in the state shown in the figure. At this time, the cross section of the seamed portion is made up of five layers of metal plates, and is extremely strong and strong enough to withstand thermal deformation.

In addition, since the entire circumference is tightly wound, there is no need to worry about leakage of high frequency waves, and there is no need to worry about the front plate 1 and body plate 3 separating or falling off even if they fall during transportation or handling.

FIG. 5 shows a simplified configuration of the embodiment shown in FIG. 4, and in FIG. The folding process is performed in the same manner as in the case shown in FIG. It is clear from the figure that the metal plate is made up of four layers, so that it is comparable in strength to the case shown in Figure 4, and at the same time, the processing of the front plate 1 is relatively easy. There is an effect that it can be done.

In FIG. 6a, a plurality of holes 18 are provided in the overlapping portion of the body plate 3 and the front plate 1, and protrusions 19 that engage with the holes 18 are provided on the front plate 1 side. A flange portion 20 is provided in front of the front plate 1.
, which extends outward from the body plate 3. This flange portion 20 is bent to embrace the end of the body plate 3 to form the shape shown in the figure, and due to the engagement of the hole 18 and the protrusion 19,
There is no fear that the front plate 1 will fall off forward. According to this method, processing of the body plate 3 and the front plate 1 is extremely easy, and no excessive force is applied to the materials.

In the examples shown in FIGS. 4, 5, and 6, the seaming is performed outward, but in the examples shown in FIG. 7 and subsequent figures, the case where the seaming is performed inward will be explained.

In FIG. 7a, a sloping portion 21 is provided on the flange portion of the front plate 1, and a sloping portion 22 having the same inclination as this and a flange portion 23 extending horizontally in front of the sloping portion 22 are provided on the body plate 3 side. The parallel flange portion 23 of the body plate 3 is bent inward to form the inclined portion 21 of the front plate 1.
If you hold it in place and then push down the slope from the outside, you will get the situation shown in the figure. That is, the front plate 1 is provided with a step corresponding to the thickness of the body plate 3, and this step prevents the front plate 1 from moving inward and falling off. According to this method, there are very few irregularities on the surface of the shell plate 3 as the outer shell material, and there are no gaps for dust or moisture to enter, so the commercial value is significantly increased. In the example shown in FIG. 8, the shape of the shell plate 3 is is the same as in FIG. 7, but the inclined flange portion 24 of the front plate 1 is further folded back to
It is double-layered.

As shown in the figure, the outward bulge of the body plate 3 after tightening is due to the fact that the thickness of the front plate 1 is increased by 1 minute compared to the case shown in Fig. 7. It is possible to more strongly prevent it from falling off towards the end.

Figure 9 shows the front plate 1 in the form of a flat plate, which is placed against the vertical portion 26 of the body plate 3, the flange portion 27 extending forward of the body plate 3 is bent, and the front plate 1 is rolled up as shown in the figure. The processing of the front plate 1 is extremely simple, and the seaming work is also easy.

In FIG. 10, the front plate 1 is provided with a flange portion 28 extending forward, and the body plate 3 is provided with a vertical portion 29 and a seven-lung portion 30 extending forward.
The vertical part of the front plate 1 is in contact with the vertical part 29 of the body plate, and the flange part 3014 of the body plate is internally moved to embrace the flange part 28 of the plate 1. Complete the seaming as shown below.

According to this method, the strength of the front plate 1 is strong, the tightening work is easy, and there is no fear of it falling off.

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

(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 outer shell of the device main body 9, so that the volume of the heating chamber can be 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 it is constructed by seaming, the casing is extremely strong, and since it is joined uniformly over the entire circumference, high frequency leakage does not occur.

(4) Sealing outwards allows for reliable joining and allows processing without applying excessive force to the material.

(5) Inward joining provides a smooth outer surface, which prevents dust and moisture from accumulating and is easy to clean.

(6) Unlike Nuvosoto welding and screw joints, there is no need for a separate member to cover spot marks, screw tips, etc., the manufacturing cost is low, and mass production is possible.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention; Fig. 2 is a perspective view of the casing structure before seaming; Fig. 2 is an external perspective view showing the structure of the body plate; and Fig. 3 shows another embodiment of the present invention. Fig. 4 is a partial cross-sectional view of the body plate structure before and after seaming, Fig. 5 is a cross-sectional view of the second embodiment of the same part, and Fig. 6 is a cross-sectional view of the third embodiment of the same part. 7 is a sectional view of the fourth embodiment of the same part, FIG. 8 is a sectional view of the fifth embodiment of the same part, FIG. 9 is a sectional view of the sixth embodiment of the same part, FIG. 10 is a sectional view of the seventh embodiment of the same part,
Figures 4 to 10 (,) are cross-sectional views before seaming, (b)
FIG. 3 is a cross-sectional view showing the state after seaming. 1 Front plate, 2--Back plate, 3--Body plate, 4--Opening for putting in and taking out the heated object, 6--Ceiling surface, 7--
- left side, 8... right side, 9... - bottom, 11...
- Heating room, 12 - Electrical room. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2 Fig. 10 Fig. 3 Fig. 6 Fig. 4 (0-) ' (b) Fig. 6 (0-) (b) Fig. 9 ((L) q Fig. 10 (su(b) <7y) (b)

Claims (5)

[Claims] (1) A front plate with a door that can be opened and closed for putting in and taking out heated objects and an operating section, a back plate of the main body, and a body plate that forms the top, bottom, left and right of the outer shell of the main body from a single metal plate. A high-frequency heating device in which the front plate peripheral portion and the front end portion of the body plate, and the back plate peripheral portion and the rear end portion of the body plate are respectively joined by seaming. (2) The upper, lower, left, and right sides of the heating device main body, as well as each part of the partition plate that stands in parallel with the left and right side walls, are configured with a body plate made of a single metal plate in a substantially “” shape, and one side is formed with the partition plate as a border. The high-frequency heating device according to claim 1, wherein the heating chamber is a heating chamber, and the other is an electric chamber for storing electrical components such as a high-frequency generator. (3) The top, bottom, left and right sides of the heating device main body are formed into a substantially “mouth” shape using a body plate such as a single metal plate, and the left and right side plates are arranged in parallel, with one side serving as a heating chamber and the other side serving as a high-frequency generator, etc. 2. The high-frequency heating device according to claim 1, further comprising a partition plate that divides the electrical chamber into an electrical chamber for storing electrical components. (4) The peripheral portions of the front plate and the back plate are formed by extending outward from the front end and the rear end of the body plate of the heating device main body, respectively, and the extending portions extend outward from the front and rear ends of the body plate of the heating device main body. 2. The high frequency heating device according to claim 1, which is formed by wrapping the ends tightly so as to hug each other outward. (5) The peripheral parts of the front plate and the back plate are formed so as to enter inwardly into the front end and the rear end of the body plate of the heating device main body, and the front plate and the back plate are formed at each end of the body plate. 2. The high frequency heating device according to claim 1, which is formed by wrapping the peripheral end portions inward so as to hug them tightly.