JPS6111528A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To permit to enlarge effective volume of heating chamber by a method wherein the heating chamber is provided with a high frequency generating device emitting high-frequency, a metal plate constituting the heating chamber and other metal plate abutting against said metal plate while at least one of both metal plates is formed with comb-teeth shaped structures. CONSTITUTION:A heating chamber is constituted of one sheet of metal plate, consisting of top surface 20, left side surfacd 20b, heating chamber base 20c, partition 20d, right side surfacd 20e and electric chamber base 20f, while a plate 20g is provided in front, a back plate 20h is provided behind and a inspection window 22 is provided at an electric chamber 21. The partition 20d is provided with a comb-tooth shaped structure 23 on the parts contacting with each surface of the heating chamber 20. The electric radiation of cross mark direction is intercepted and disturbed due to the comb-teeth shaped structure 23a, while it is counterbalanced with the electric radiation of right-and-left direction of this paper, therefore, the electric radiation is not leaked into the electric chamber completely. According to this method, the heating chamber volume in an external dimension may be enlarged remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating chamber for heating an object to be heated in a high-frequency heating device such as a microwave oven, and a structure of a housing portion related thereto.

Conventional example l'A flA and its problems Conventionally, in high-frequency heating devices such as electric microwave ovens, the interior of the heating chamber is painted after it is formed, or it is constructed using a highly corrosion-resistant material such as stainless steel. However, the external material of the device is generally a separately painted steel plate or the like that is bent into a U-shape and placed over the heating chamber. In such a table configuration, a gap is created between the heating chamber wall surface (including the ceiling surface and bottom surface) and the external material, which leads to a decrease in the ratio of the effective volume of the heating chamber to the total volume of the device. Ta. Of course, these spaces are used as places to install heat insulating materials and various mechanisms, but increasing the internal volume of the heating chamber increases the amount of heating of the object to be heated. Although it has the advantage of shortening the heating time, it has the disadvantage of increasing the installation area and space occupied by the device.

Some heating devices have been devised that partially use external materials as part of the heating chamber, or even consist of a single metal plate. 58-75780'j3.

However, these structures are joined using methods such as screw fastening or spot welding, and it is not appropriate to expose them as exterior surfaces. The structure covers the joints, which increases the number of parts and makes it expensive.

In FIG. 1, which is an external perspective view of a general high-frequency heating device, on the front surface of the heating device main body 1, there is a door 2 which is pivotally supported so as to be openable and closable, and an operation spring (v3) near the door 2. The door 2 is opened and closed when the heated object is taken in and taken out from the front opening of the heating chamber 4, and the operation spring /I/3 has a timer knob 5 for controlling the heating time, and behind it is a timer knob 5 for controlling the heating time. There is an electrical component storage chamber 6 that stores power supply components and the like of the device. As one of the conventional examples of the configuration of the heating chamber 4, in FIG.
, the partition plate 4d, the right side surface 4e, and the bottom surface 4f of the electric chamber are constructed of a single metal plate in the shape of a letter 1 as shown in FIG. 3, with a front plate 4g from the front and a rear plate 4h from the rear.

It consisted of an inspection window 7 for inspection of the electrical room 6.

and an upper surface 4a forming the heating chamber 4;
The left side surface 4b, the heating chamber bottom surface 4c, the electric chamber bottom surface 4f, and the right side surface 4e also serve as an exterior plate of the main body of the apparatus.

The space on the left side was used as a heating chamber 4, and the space on the right side was used as an "electrical room 6." In FIG.
a. If each component can be welded, the joint 8b between the bottom plate 4f and the partition plate 4d can be spot welded 9 as shown in FIG.
etc., and painted as shown in the shaded area to prevent rust and serve as an exterior member. However, when the outer wall of the heating device main body and the heating chamber wall are integrated, it is technically impossible to paint the outside with wood grain and the inside of the heating chamber 4 with an eye-poly color, even if we do not consider the cost. Met. In addition, as shown in Fig. 6, a steel plate with coatings A10a and B10b, which are painted in different colors on the inside and outside of the steel plate, is prepared in advance, and is fixed by spot welding called indirect method using electrodes A11a and B11b. A method has been devised to eliminate radio wave leakage, but if the spot spacing is such that it eliminates radio wave leakage, as in the method shown in Figure 5, it would require a huge amount of equipment, which would increase processing costs. This caused discoloration, deterioration, and peeling of the coating film on the spotted exterior part 12, making it difficult to put it into practical use. In addition, in order to flow an electric current, a method is required in which the coating film 1o is partially peeled off and the metal surfaces of the steel plate through which the electric current flows are brought into contact with each other. However, the only way to make this peel off is to partially mask it with paint from the beginning or peel it off after painting, which results in a huge cost for the steel plate, which is also delaying its practical application. It was a factor.

On the other hand, there are countless means to prevent leakage of radio waves from the gap between the front opening of the heating chamber 4, which is pivotally supported to open and close, and the contact area with the periphery of the heating chamber 4. . On the other hand, the specification and drawings of US Pat. No. 2,772,402 have been devised as means for preventing radio wave leakage at coaxial waveguide junctions. Until now, there has been no invention or devised method for the joint surfaces that constitute the heating chamber of these radio wave leakage prevention means.

6 to 7 In other words, in constructing the heating chamber 4, there are joints that inevitably become visible, and there was no means to completely eliminate radio wave leakage at these joints.

In addition, another conventional example is shown in FIGS. 7 and 8, which is also the second example.
It is similar to FIGS.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a high-frequency heating device having a structure that eliminates the above-mentioned drawbacks and extremely increases the effective volume of the heating chamber that covers the entire volume of the device. This is an attempt to make the heating device more compact and cost-effective by simplifying and reducing its weight.

Structure of the Invention In order to achieve the above object, the high-frequency heating device of the present invention includes a high-frequency generator that radiates high-frequency waves into a heating chamber, a metal plate A that constitutes the heating chamber, and a heating chamber that is in contact with the metal plate A. The metal plates A and B7 are provided with a metal plate B, and a comb-shaped structure is formed on at least one of the metal plates A and B, and the metal plates A and B7 in the heating chamber are connected only by contacting each other without using a joining method such as spot welding. This has the effect of completely eliminating radio wave leakage at the junction with the connector.

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

FIG. 1 is an external perspective view of a general high-frequency heating device.

In FIG. 1, on the front side of the heating device main body 1, there is a door 2 which is pivotally supported so as to be openable and closable, and an operating spring f near the door 2.
There is iy3. The door 2 is opened and closed when the heated object is taken in and out from the front opening of the heating chamber 4.
Reference numeral 3 has a timer knob for controlling the heating time, and behind it there is an electrical component storage chamber for storing power supply components of the oscillation device and the like.

An embodiment of the present invention in the configuration of the heating chamber 10 is shown in FIG.

In FIG. 9, the heating chamber 10 has an upper surface 20a1 and a left side surface 20.
b, heating chamber bottom 20c1 partition plate 20d, right side 20e,
As shown in Figure 10, cover the bottom surface 2Of of the electrical chamber with a single metal plate.
It is constructed in a substantially "" shape, and consists of a front plate 20g from the front, a rear plate 20h from the rear, and an inspection window 22 for inspecting the electrical room 21.

And, the “− face 20 that constitutes the heating chamber 20
a1 left side 20b, heating chamber bottom 20c, electric chamber bottom 20
f, the right side surface 20e also serves as an exterior plate of the device main body.

The space on the left side becomes a heating chamber 20, and the space on the right side becomes an electric room 21. The main parts of one embodiment of the present invention will be explained. A comb-like structure 23 is provided at a portion of the partition plate 20d that is in contact with each surface of the heating chamber 20. 23a is a contact portion between the upper surface 20a and the partition plate 20d, and 23b is a contact portion between the front plate 20g and the partition plate 20.
A contact portion 23c with d is a contact portion between the back plate 20h and the partition plate 20d, each of which is provided with a comb-like structure 23.

The comb tooth width dimension ``a'', the groove width ``b'', and the slit groove depth ``C'' can be determined by various methods as shown in Japanese Patent Publication No. 51-22661, U.S. Patent No. 2,772,402, and the drawings. The dimensions can be considered, but the dimensions of the contact surface
Also, by surface treatment of steel plate (paint plating layer), etc.
All you have to do is conduct some experiments and consider and decide on various dimensions depending on the level of radio wave leakage.

FIG. 11 shows an enlarged view of section P (joint section 23a) in FIG. 9. The exterior of the 61Yi board is pre-painted wood grain color 24a, and the heating chamber side is pre-painted Ivo IJ 24b.

The upper surface 20 of the partition plate 20d that is causing the steel plates to come into contact with each other
A comb-like structure 23a is provided on the contact surface to a. When radio waves try to leak from the heating chamber 20 to the electrical chamber 21 as shown by the arrow, the comb-like structure 23a blocks and disturbs the radio waves in the direction of the mark (front and back of the drawing). This cancels out the radio waves in the left and right directions, and there is no leakage of radio waves to the electrical room 21. In the worst case, even if there is a gap between the comb-shaped structure 23a and the upper surface 20a at the joint surface, it has been experimentally confirmed that the dimensions ``a'',%%b'','c'' will make the radio wave leakage to a level that does not cause any problem. , 1d" could be easily determined.

FIG. 12 shows another embodiment of the present invention, in which the heating chamber 20 has a separate partition plate and the other parts are shaped like a square.

In this way, according to this embodiment, each 101° of the heating chamber 20 is
A comb-like structure 23 is placed on the joint surface of the metal plate that constitutes the surface.
By providing this, radio wave leakage can be completely eliminated, and even if surface-treated steel sheets with an insulating film such as coating or plating (which cannot be welded) are used, radio wave peaks from the joint surface can be completely eliminated. This has the effect of eliminating spot welding work when constructing the heating chamber.

Effects of the Invention According to the present invention, the following effects can be obtained.

(1) A single metal plate that forms the side surface of the heating chamber, with the inside serving as the heating chamber and electrical room, and the outside serving as the main body of the device, allowing for an extremely large heating chamber volume relative to its external dimensions. .

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

(3) Conventionally, as shown in Figure 5, the casing was first made and surface treatments such as painting were performed, so air from heating chambers, electrical rooms, etc. was connected to the area to be painted, so it was necessary to However, by implementing the present invention, it is possible to use steel plates that have already been treated with paint, etc., which improves transportation efficiency and reduces costs. .

(4) In the past, creating a heating chamber required a considerable amount of one-input industrial manufacturing, such as welding and painting, but with the implementation of the present invention, welding and painting were performed. Painting after spot welding is no longer necessary, and the equipment for creating the heating chamber can be simplified, which in turn can contribute to the reduction of costs.

(5) As shown in Figures 5 and 6 of the welded joints, there is no need for separate parts for covering the grooves and marks, and the manufacturing process is therefore cheaper and easier to mass produce. It will be rich in

(6) Nubo) 1 - When welding, even if you pay close attention to the spacing between the welds, if even one of them is insufficiently welded, there will be sparks or radio wave leakage, as shown in Figure 5. Repairs and services could not be performed after painting, and in the end the heating chamber had to be replaced, which was a pain.However, by implementing the present invention, even if there is a slight gap, it is easy to repair because there is only contact. In the worst case, if the part is shown in Figure 9, repair the 11 cut plate 20d, if it is shown in Figure 10,
This can be improved by repairing or replacing the partition plate, making it suitable for mass production and maintenance.

7) It is technically difficult to mask the inside and outside of the device using the method shown in Figure 5, and it is impossible to achieve this in terms of varnishing. When making variations, it was even necessary to have a double U-shaped exterior outside the heating chamber as in the past, but with the implementation of the present invention, it is possible to make the inside and outside of the device different colors as shown in Figure 11. Since a heating chamber can be formed, it is very advantageous for business.

(8) Since the comb-like structure is provided on the joint surface of the heating chamber, the heating chamber structure is free from radio wave leakage.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a general high-frequency heating device, Fig. 2 is an exploded perspective view of a heating chamber of a conventional high-frequency heating device, and Fig. 3 is an exploded perspective view of a heating chamber of a conventional high-frequency heating device.
The figure is an external perspective view showing the configuration of the heating chamber in FIG. 2, FIG. 4 is a left-right sectional view of FIG. 2, and FIG. is a partial sectional view of a conventional heating chamber (771 structure), FIG. External perspective view shown in Fig. 8d
FIG. 71 is a 1iar side view of the ■ side of FIG. 71, and FIG.
0 Figure Q: 1 An external perspective view showing the heating chamber 1j' to 1j' in Figure 9. Figure 11 shows the joint surface of the P section in Figure 9.
, Mingzu, jq'I, 12 figure r1, actual song of the present invention MIL
Example heating chamber] (-11rH1+lE 'tt, small space 1
Perspective view 3゜1... Main body, 2...
Door, 3...Operation panel, 20...Heating chamber, 21...Electrical room, 22...Inspection window, 23...Comb-shaped (14 structures, 24...
・Painted steel plate surface. ]! Names of 11 people: Toshio Nakao, benzo, and 1 other person
Name Diagram 1 Ward ゞ Dimensions? > Dimensions

Claims (2)

[Claims] (1) A high frequency generator that emits high frequency waves into the heating chamber;
A configuration comprising a metal plate A forming a heating chamber and a metal plate B contacting the metal plate A forming the heating chamber, and forming a comb tooth-like structure on at least one of the metal plates A and B. high frequency heating device. (2) The high-frequency heating device according to claim 1, wherein an insulating coating is formed on at least one of the metal plates A and B on a surface where the metal plates A and B are in contact with each other.