JPS58200932A - Electronic range - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the cost reduction of the microwave oven, and is intended to eliminate the cost of the microwave oven, which accounts for a high proportion of the manufacturing cost.

Although microwave ovens are recognized for their excellent features when it comes to reheating food, in recent years in Japan, the number of microwave ovens
Only less than 0,000 units were produced and sold. The biggest reason for this is that the product price is too high for its reheating function, and therefore cost reduction has been a strong desire for a long time. VE (value engineering) is well known as an effective method for cost reduction, and based on this method,
When I looked at the product again, I noticed that the heating chamber and the outer box had similar functions. In fact, in the past, there have been examples on the market where the back side of the heating chamber forms the back side of the product, and products where the bottom side of the heating chamber is completely uncovered.

Microwave ovens are generally almost rectangular parallelepipeds, and of the large surfaces that make up the top, bottom, front, back, left, and right, two of the bottom and back surfaces, which are hard to see by people, are already the heating chamber wall surface, that is, the surface of the outer box. This means that Since the front is a door, can't we exclude it and remove the outer box from the remaining left, right, and top sides?

Figure 1 is a sectional view of the main parts of a conventional microwave oven. Between the heating chamber 1 and the outer box 2, there is a magnetron 3,
．． There is a waveguide 5 and the like. There is an IT door 6 on the front and a rubber Asia on the bottom. Of course, there are also other electrical components such as a fan motor for cooling the magnetron, a transformer for generating high pressure, and an air guide for ventilation in the heating chamber, but these are omitted in this conventional example. Now, looking at the functions of the outer box 2 in Fig. 1, the first function is to protect electrical components such as the open lamp 4 and magnetron, and the second function is to protect the waveguide.
・・・・・・・・・ Rather, it is to cover up the aesthetic disadvantage of providing this kind of protrusion on the exterior part, and thirdly, it is a hole in the heating chamber wall below the oven rung 4. This is to prevent wires from being inserted into the small hole group 8 for light transmission, the small hole group 9 for ventilation in the heating room, etc., and radio wave leakage from human silk. If there is a means that can replace the function in Section 3.1 above, the outer box r1 can be omitted.

The present invention solves the conventional problem described in 1. Significant f? , [γ
The purpose is to omit the outer box of the microwave oven in order to reduce monthly expenses. In order to achieve the above object, the present invention divides a metal box into two parts, one is a heating chamber and the other is a mechanical room, and a group of small holes for interior lighting or ventilation are provided at the radical end of the partition or in the heating chamber. This is a configuration that is installed on the back or bottom of the microwave oven, and the outer box of the microwave oven, which was conventionally indispensable, is omitted, resulting in a significant cost reduction.

An embodiment of the present invention will be described below based on the drawings. FIG. 2 is a perspective view of one embodiment of the present invention, in which the door 6 and the operating section 10 can be seen from the front. Note that the door and the operating section are well known and are not the main point of the present invention, so they are not shown in detail. Third
The figure is a sectional view taken along the line AA' in FIG. 2, and the iron plate box 11 is screwed to the galvanized steel plate bottom plate 12 to form a rectangular parallelepiped box. A steel partition plate 13 is installed vertically through the box from top to bottom, and a machine room 14 is installed on the right side. Heating chamber 1 on the left
shall be. In order to facilitate understanding, parts with the same names as those in the conventional example are given the same numbers. A chalk plate 15 made of iron plate is welded to the bottom of the heating chamber 1 (the part in contact with υ12) to form a 174-wavelength choke plate.A choke plate 15 made of iron plate is welded to the bottom of the heating chamber 1 (the part in contact with υ12) to form a 174-wavelength choke plate. A food table 16 is placed thereon and the surrounding area is fixed with silicone rubber.A rectangular square hole is made in the center of the heating chamber 1 of the bottom plate 12, and a polypropylene stirrer IIq1 is placed on top of the hole.
118 is fixed, and an aluminum stirrer blade 19 is inserted into the shaft. On the bottom plate of the lower part of the stirrer blade 19,
A group of small holes 20 for exhaust are opened and covered with a cover 21 made of iron plate. The cover has an opening [] only on the left side, air is discharged from this opening, and the shape is such that a wire cannot be inserted into this small hole from the outside. A magnetron 3 is placed on the bottom plate in the machine room, and its antenna passes through the bottom plate 12. A waveguide 5 made of iron plate is welded and fixed to the bottom plate at a position connecting this antenna and the square hole 17. Rubber 4 on the bottom plate
777 are provided, and the height of the reed is made higher than that of the waveguide J. An air guide 22 for exhaust is provided in the machine room to remove steam and odor from the food.

FIG. 4 is a cross-sectional view taken along the line BB' in FIG. 2, and is a perspective view of the partition plate side from the heating chamber. Part of the partition plate 13 has a door 6
Starting from the side, magnetron cooling air introduction 9. Warehouse, light 8. and a group of small holes 23 for exhaust are provided. In addition, in order to rotate the stirrer blades 19, the chalk plate 15 has a
A group of small holes 24 for introducing magnetron cooling air are formed. Similarly, the small hole group 25 (
Although it is hidden behind the chalk board in Figure 4 and cannot be seen, it is clearly shown in Figure 6. ) will be established.

FIG. 6 is a perspective view of the bottom plate 12 before the iron plate box is attached. As described above, the bottom plate 12 is a galvanized steel plate with a thickness of about one recess, and four rubber asias are fixed to the lower side. The small exhaust hole group 20 drilled in the bottom plate 2 is as described above, and the stirrer blade 19? , the taller shaft 18 is provided above the square hole 17. As described above, the magnetron 3 is fixed with the antenna passing through the bottom plate, and a fan motor 25 is provided in contact with the magnetron 11. The air outlet of this fan motor faces the magnetron, and the suction port faces downward, sucking air from below the bottom plate through a hole (not shown) drilled in the bottom plate. On the opposite side of the fan motor 25, an air guide 26 is provided adjacent to the magnetron. The air guide A is for guiding the magnetron's cooling air to the small hole 8 and 5, and a perspective view thereof is shown in FIG. The magnetron cooling air enters from the right side and exits from the left side, as shown by the arrow in Figure 6. As will be described later, part of the wind is guided upward through the square notch 27 provided in the air guide A. The high voltage transformer 28 has one side placed on the air guide A26 and the other side placed on the bottom plate 12 directly with its two-shaped legs.

The high-voltage capacitor 29 is placed under the transformer, and a hole 30 is made around the bottom plate 12, and the steel box and the bottom plate are fastened with screws passing through this hole.

After assembling it in the state shown in Fig. 5, the box shown in Fig. 7 is placed on top of it and secured with screws. FIG. 7 is a partially cutaway perspective view of the iron plate box 11.

FIG. 7 shows a group of small holes 26 for introducing the magnetron cooling air on the partition plate 13. Similarly, an air guide Ba1. (The air guide B has an opening only at the bottom and fits into the notch 27 provided in the air guide A 26.), the oven lamp 4 provided opposite the chamber lighting small hole group 8, and the exhaust gas The air guide 22 is visible. FIG. 8 is an exploded perspective view of the iron plate box 11. The iron plate box 11 has upper left and right walls 32 made of iron plates of about 0.8 inch. It consists of a rear wall 33°, a front wall 34, the aforementioned partition plate 13, and a chalk plate 15, and is powder coated after being assembled by spot welding. A group of small exhaust holes 35 connected to the exhaust air guide 22 are formed in the back wall 33 . The front wall 34 has an opening 36° for food entry and exit, and an opening 37 for the operation section. A small hole 38 provided in the door 6 through which a key (not shown) can enter and exit.
and 39 are provided. Further, a belt-shaped curled portion 40 for a hinge is provided at the left end. As shown in FIG. 4, the upper and left and right ends of the food entry/exit opening 36 are processed to have close contact curves.

Holes 4 are provided in the parts of each component except for the chalk board that are in contact with the bottom plate at positions corresponding to the holes 30 drilled in the bottom plate.
1 is opened and screwed in as described above.

Hereinafter, the operation of the "-" structure acid will be explained.

The radio waves generated by the magnetron pass through the waveguide and enter the square hole 17.
radiated into the heating chamber. The air sucked into the fan motor from the underside of the bottom plate cools the magnetron, passes through the air guide A26, a portion of which passes through the small hole groups 26 and 24, enters the bottom of the food table in the heating chamber, and flows into the stirrer blade. After rotating, the gas is discharged to the outside of the heating chamber through a group of small exhaust holes 20 formed in the bottom plate. The remainder of the wind that has passed through air guide A passes through air guide B31 and passes through small hole group 9 to JJ[
1 enters the heat chamber, passes through the small hole group 23 along with the steam and odor emitted from the food, passes through the exhaust air guide 22, and is further discharged to the outside through the exhaust small hole group 35)'. The light from the Ushida oven lamp 4 illuminates the heating chamber through the small illumination holes l (186 ways).

It is difficult to insert wires from the outside into the small holes ffT9.8 and 23 and 25 drilled in the sword handle 13. The small holes 20 drilled in the bottom plate have a force of -21, so it is not possible to insert a wire.This cover is provided on the bottom and is not easily seen, so it does not spoil the aesthetic appearance. . Similarly, since the waveguide 6 is also provided at the bottom of the bottom plate, the aesthetic appearance is not spoiled.

All electrical parts are still stored in the mechanical room, so
Protected from external electric shock and mechanical damage.

As explained above, according to the present invention, it is possible to omit one of the two metal boxes, the outer box and the heating chamber, which were conventionally considered essential, and therefore the direct material cost can be reduced significantly. Although the exhaust small hole group 20 and the cover 21 are provided on the bottom plate in the above, it is also possible to provide them on the back wall 33. In other words, even if the cover 21 is provided on the back wall 33, the aesthetics will not be spoiled that much. However, if the waveguide 5 were installed on the upper left and right walls 32, it would greatly spoil the aesthetic appearance.The waveguide 5 was also installed on the bottom plate.
A square hole 17 (excitation port) can be provided in the center of the lower surface of the heating chamber, which is advantageous in terms of uniform heating performance. ■ Conventionally, a dielectric was required to block the excitation [], but this can be omitted.

If this effect is ignored, it can be provided on the back wall 33o for the same reason as the cover 21, or it can also be provided on the partition plate. Even in this case, the effect of ``the conventional outer box can be omitted'' remains.

At No. 81, openings were made on the upper left and right walls 32 as shown by the two-dot chain lines for reasons of repair, parts replacement, or assembly work. Although it may be a design requirement to do so, the effect of omitting the outer box remains even in this case.

Another effect is that compared to the conventional example, for heating chambers with the same volume, the volume of the entire device can be much smaller in the embodiment of the present invention, which has two advantages in terms of packaging and transportation. It also has space advantages when used in a narrow kitchen.

[Brief explanation of the drawing]

Figure 1 is a partial diagram of the main parts of a conventional microwave oven, Figure 2 is a perspective view of the same, Figure 3 is a sectional view taken along line A-A' in Figure 2, and Figure 4 is a cross-sectional view of Figure 2. BB' sectional view, Figure 6 is a perspective view with the iron plate box removed, Figure 6 is a perspective view of air guide A, Figure 7 is a partially cutaway perspective view of the iron plate box, and Figure 8 is a perspective view of the air guide A. The figure is an exploded view of the iron plate box. 11...Iron plate box, 6...Door, 3...
・・・・Magnetron, 41II・・・Oven lamp, 13・・l111・・Partition plate, 36・・φ food entry/exit opening, 14・・・Machine room, 8・・・・Group of small holes for lighting, 26... Group of small holes for introducing magnetron cooling air, 9... Group of small holes for introducing magnetron cooling air, 23... Group of small holes for exhaust, 33...
Back wall, 12... bottom plate, 20... small exhaust hole group, 21... cover. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 5 Figure 7 f

Claims (1)

[Scope of Claims] The metal plate includes a rectangular parallelepiped metal plate box, a door for opening and closing an opening of the metal plate box, a high frequency oscillator such as a magnetron, and an electric component such as an oven lamp. The manufacturing box is divided into two parts by a vertical metal partition plate, one of which is used as a heating chamber and the other as a machine room. The heating chamber has an opening for food entry and exit on any wall surface other than the partition plate, the door is attached here so that it can be opened and closed freely, the high-frequency oscillator and electrical components are housed in the machine room, and there is a small opening for internal lighting. A group of holes is provided on the partition plate, and a group of small holes for ventilation in the heating chamber are provided on the partition plate or on the back surface 4 or the bottom surface of the microwave oven, which is covered with a cover.