JPS6319794A - Heating cooker - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to objects to be heated in a heating chamber such as in an open microwave oven. This invention relates to a cooking device that heats using heat from a heater and high frequency waves.

Conventional technology Generally speaking, open microwave ovens use a heating method using a heater, which mainly utilizes heat radiation and natural convection. It can be roughly divided into hot air circulation type, which heats the food by forcing the heat to circulate inside the heating chamber using an air blower.

The former generally has good performance as an electrical open circuit and can be made at low cost, so it is the mainstream.

As shown in FIG. 4, an upper heater 4 and a lower heater 5, such as sheathed heaters, are arranged on the top 2 and bottom 3 of the heating chamber 1, respectively. This upper and lower heater 4.5 is connected to the heating chamber wall 6.
It penetrates through the microwave oven main body 7 and is electrically connected and energized. Furthermore, high frequency waves oscillated by an oscillator 8 are radiated into the heating chamber 1 through a waveguide 9. A turn tape /L/10 is provided on the bottom surface 3 of the heating chamber to rotate the food and improve the uniform heating properties of high-frequency heating. The high frequency radiated into the heating chamber is as described above.
High frequency leakage to the outside of the heating chamber through the holes in the heating chamber wall through which the lower heaters 4 and 6 penetrate, so high frequency chime to prevent this 11.1
2 is provided. In particular, the lower heater 5 on the bottom surface 3 has a removable structure in order to facilitate cleaning of the bottom surface in case food broth or the like spills, so the connection part of the lower heater 5 is complicated.

Problems to be Solved by the Invention However, in such a conventional heating cooker, the upper heater 4 and the lower heater S are exposed in the heating chamber 1, and the turn tape/L'l Ol- Because of this configuration, the effective volume of the heating chamber 1 is reduced by that amount, which has the disadvantage that it is difficult to heat large foods. In addition, in order to make the heating chamber large enough to accommodate large foods, it is necessary to make the heating chamber larger by the size occupied by the heater and the turn tape p6, and since the external size also becomes larger, a large installation space is required, making heating difficult to use. It had become M Ruki.

Furthermore, if the upper and lower heaters were exposed in the heating chamber, even if food stains were scattered on the walls of the heating chamber, the upper and lower heaters would get in the way and be difficult to clean, making it inconvenient to use.

Furthermore, there was also a configuration in which the heater was placed outside the heating chamber, but in this case, the heat of the heater was not efficiently transferred into the heating chamber, resulting in poor thermal efficiency, and this was only possible in cases where sufficient power consumption capacity was available. It was only put into practice. In addition, especially if the lower heater is placed outside the heating chamber, the heat of the lower heater will radiate to the installation stand, etc., and an extra insulation structure will be required, resulting in large energy losses, which is not desirable from an energy saving perspective, and is not practical. It wasn't.

The present invention solves these conventional problems, and has excellent thermal efficiency, and is easy to use by keeping the heating chamber clean. Moreover, the heating cooker of the present invention has a heating chamber for storing food, Equipped with a high-frequency generator that emits high-frequency waves into the heating chamber and an electric heating device that heats the food.
A compartment separated by shelf boards made of an inorganic dielectric material such as ceramic is provided in the heating chamber, and a high-frequency radiation port of a high-frequency generator, a radio stirrer, and an electric heating device are arranged within this compartment. Furthermore, the high-frequency radiation port is located approximately at the center of the heating chamber wall, and the electric heating device is installed around the high-frequency radiation port in a symmetrical manner with respect to the vertical and horizontal axes of the radiation port, and furthermore, the electric heating device is installed between the electric heating device and the shelf board. A conductive plate with several openings is interposed.

Function: The cooking device of the present invention heats the food by radiating heat from the electric heating device and high frequency radio waves from the high frequency generator through the shelf plate metal storage. and,
The shelves that make up the compartments are made of inorganic dielectric materials such as ceramics, so the loss of high-frequency radio waves is extremely small, and because they are subject to heat conduction and radiation from the electric heating device in the vicinity of the shelves. The emissivity is higher than that of a normal metal surface, and the heat from the electric heating device is efficiently radiated toward the object to be heated, so this aspect also increases thermal efficiency.

In addition, the electric heating device, high-frequency radiation port, and radio wave stirrer are all integrated in the compartment, and there is no need for an exposed heater, so the effective volume inside the heating chamber is widened, and the heat distribution is made uniform by the shelf board. Performance and usability can be improved by making the high frequency distribution uniform due to the symmetrical shapes of the radiation port provided in the center of the heating chamber wall, the radio stirrer, and the electric heating device.

EXAMPLE Hereinafter, a heating cooker according to an example of the present invention will be explained with reference to the drawings.

FIG. 1 is a front sectional view showing the structure of the cooking device of the present invention.

In FIG. 1, a heating chamber 14 that accommodates an object to be heated 13 has an upper wall surface 16 and a lower wall surface formed integrally with each other, a side wall surface 16, a back wall surface (not shown), and a door through which the object to be heated 13 is brought in and out. It is formed into a substantially box shape with a surface (not shown). Heating chamber 14
Shelf protrusions 16 are provided on the left and right sides at the lower part of the side wall.

A shelf board 17 made of an inorganic dielectric material such as ceramic is surrounded by a packing 1 made of a flexible heat-resistant material such as silicone rubber.
Heating chamber walls (side wall 16, back wall, etc.) are covered by sunlight.
It is fixed at a position where it contacts the shelf protrusion 16 without any gap. An opening 2o is provided at the center of the bottom of a compartment 19 newly formed in the heating chamber 14 by the shelf board 17, and a high-frequency radio wave oscillated by a magnetron 21, which is a high-frequency oscillator, is provided at the center of the bottom of the compartment. The high-frequency radio waves propagate through the waveguide 22'' and are carried into the compartment 19 through the opening 20.The carried high-frequency radio waves are transferred to the Nutara Hane 25, which is a radio wave agitating blade that is provided above the opening 20 and rotated by a motor 24 through a shaft 23. in,
The high-frequency electric field distribution is made uniform, and the high-frequency electric field is transmitted through the shelf board 17 and radiated into the heating chamber 14 .

A lower heater 26 is provided in the compartment 19 so as to surround the opening 20 and the stirrer blade 25.
Conductive heat and radiant heat are transmitted to the heating chamber 14, and the heat is further radiated to the heating chamber 14 from the bottom. An upper heater 27 that applies heat to the object to be heated 1a from above is provided close to the upper wall surface 15. Each heater has a choke structure to prevent leakage of high-frequency radio waves to the outside of the heating chamber, and receives power supply from outside the chamber through choke tubes 28 and 29 fixed to the side wall 16 of the heating chamber. A reflector plate 30 is provided between the lower heater 26 and the shelf board 17, which is made of a conductive material and is used to more uniformly apply the high frequency radio waves stirred by the stirrer blades 25 and the heat from the lower heater 26 to the heated object 13. It is being done.

FIG. 2 is a cross-sectional plan view taken along the arrow E' in FIG. 1, showing the structure of the compartment of the heating cooker according to the present invention.

In FIG. 2, a slit-shaped opening 20 is provided in the center of the compartment perpendicular to the direction in which high-frequency radio waves travel in the waveguide 22 (to the left in the figure). High-frequency radio waves are radiated into the compartment 19 from the opening 20, but at this time, the directionality of the radio waves causes the strength of the electric field to vary in the direction of propagation of the radio waves, so a stirrer blade 25 having four stirring blades is installed above the opening. This rotation eliminates the directivity of the radio waves that enter the compartment through the opening 20. Further, a reflector plate 30 is provided between the stirrer blades 25 and the heating chamber 140, and the radio waves stirred by the stirrer blades 25 are transmitted through the openings 31, 31' on the reflector plate 30, the notches 33 for the mounting legs 32, and the outer periphery. The radiation passes through the gap 34 between the parts and enters the heating chamber 14. In this case, since the intensity of the radio waves passing through can be adjusted by adjusting the size of the aperture 31, the aperture in the B section is made larger than that in the A section, where the radiation distance from the aperture 20 is shorter, to achieve uniformity. Also, lower heater 26
Since it is a conductor, it reflects the radio waves from the aperture 20, so it is formed approximately axially symmetrically with respect to the aperture 20"f, the x-x' axis, and the Y-Y' axis centered on the aperture 20, thereby improving the uniformity of the radio waves. We take care not to damage it.

The heat distribution may vary slightly depending on the shape of the lower heater 26. For example, the projected density of the heater is higher in the area C near the power supply from outside the refrigerator than in other areas, so the heat distribution may be locally conducted or
Radiant heat becomes stronger. For this reason, the openings like those provided in the A part of the reflector plate 30 are eliminated from the 0 part, and in the embodiment aiming at thermal uniformity, the openings are circular (31.31"e), but rectangular openings may also be used. Contains similar effects.

FIG. 3 is a perspective view showing the shape of the reflecting plate 3o. In the embodiment, the mounting foot 32 and the notch 33 (il-) were formed integrally, but it is also possible to form the mounting foot alone. In this case, the reflecting plate 3o becomes a flat plate and the opening 31.31" is freely formed.
k can be formed.

Effects of the Invention As described above, the heating cooker according to the present invention can exhibit the following effects.

(1) Since the electric heating device such as a heater, the radiation port of the high-frequency generator, and the radio wave stirrer are concentrated in a compartment in which the heating chamber is separated by a shelf board, it is possible to use both high-frequency heating and electric heating as heating means. is applied to the object to be heated from the same direction, and a uniform heating structure such as an electric heating device or a radio stirrer is effective for both heating means, and the structure can be consolidated.

This increases the effective volume within the heating chamber, making it possible to heat and cook even large foods. Also, if the heating volume is the same, the external size can be made smaller than before.
A compact and easy-to-use heating cooker that does not take up much space can be realized.

(2) Heat radiation from the electric heating device to the heating chamber and the heated object is prevented by shelf boards made of inorganic dielectric materials such as ceramics.
The emissivity of the surface is extremely high compared to that of metal surfaces, especially in the relatively long wavelength range from near infrared rays with wavelengths of 1 micron or more to far infrared rays. . Therefore, the heat of the electric heating device is efficiently transferred into the heating chamber, and heat radiation such as near-infrared rays and far-infrared rays suitable for heating food is increased, and the efficiency and performance of cooking can be extremely improved.

0) Since the heat of the electric heating device is once transferred to the shelf board, the heat spreads throughout the shelf board due to the heat capacity of the shelf board, and uniform heat radiation is performed toward the heating chamber, resulting in uniform heat distribution to the heated object. can be given.

(4) Compared to the conventional configuration in which the lower heater, which is most contaminated by boiling liquid, etc., is exposed inside the heating chamber, the heating chamber has a clean shape with fewer irregularities, there is no need to attach or detach the electric heating device, and cleaning is easy. It's easy and extremely easy to use.

If a reflector is installed between the shelf board and the heater, this reflector not only prevents local overheating of the heater and uneven heat distribution, but also reduces the transmittance of high-frequency radio waves to the heated object. can be adjusted, and both high-frequency heating and electric heating can be used at the same time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a heating cooker according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line E', showing the structure of the compartment of the same heating cooker, and FIG. 3 is a view of the same heating cooker. It is a perspective view showing a reflector of a container. FIG. 4 is a sectional view of a conventional heating cooker. 14-Heating chamber, 17...Shelf board, 19...
- Compartment, 20...opening, 21...magnetron, 22...i-wave? , 2s...
Star blade, 26...Lower heater, 3o...
...Reflector, 31...Open hole. Name of agent: Patent attorney Toshio Nakao and 1 other person/q
-7%'! ! Figure 3 α Figure 4

Claims (3)

[Claims] (1) A shelf board comprising a heating chamber for storing and cooking food, a high-frequency generator for emitting high-frequency waves into the heating chamber, and an electric heating device for heating the food, and made of an inorganic dielectric material such as ceramic inside the heating chamber. A compartment separated by
A heating cooking device characterized in that a high-frequency radiation port of the high-frequency generator, a radio wave stirrer, and the electric heating device are arranged in this compartment. (2) The high-frequency radiation port is located approximately at the center of the heating chamber wall, and the electric heating device is provided around the high-frequency radiation port in a symmetrical manner with respect to two axes, vertical and horizontal. 1
Heating cooker as described in section. (3) The cooking device according to claim 1, characterized in that a reflecting plate having a plurality of openings is interposed between the electric heating device and the shelf board.