JPS643198Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical Field of the Invention] The present invention relates to a high-frequency cooking device for cooking food, and particularly relates to a microwave excitation device in this high-frequency cooking device. [Technical background of the invention] As shown in FIGS. 1 to 3, this type of high-frequency heating cooking device that has already been proposed includes an oven 2 and a machine room 3 in a box-shaped case body 1.
An oven frame 4 is provided, and a shelf board 6 on which the food to be cooked 5 is placed is removably provided in the oven 2 of the oven frame 4, and a top plate 4a of the oven frame 4 is provided. An excitation port 7 is provided in the top plate 4a located directly below the excitation port 7, and a partition plate 8 made of a low dielectric material for blocking mist etc. is provided, and further,
A rectangular square-shaped cavity frame 9 is provided on the top plate 4a located directly above the excitation port 7 to form a cabin 10, and a waveguide 11 is installed horizontally on one side of the cavity frame 9. Attach the magnetron 12 to one end 11a of the waveguide 11 with its antenna 1.
On the other hand, a motor 13 constituting a starvation fan is provided in the cavity frame 9 where the excitation port 7 is located, and a rotation shaft 13 of this motor 13 is provided.
A rotary disk 14 made of a low dielectric material is mounted on the rotary disk 14, and a plurality of fan-shaped metal plates 15 are attached to the rotary disk 14 to form a substantially cross-shaped slit 16 for microwave excitation in the radial direction. This is what I did. Therefore, in the above-mentioned high-frequency heating cooking device, when cooking in the microwave, by energizing the magnetron 12, the microwaves from the antenna 12a of the magnetron 12 are guided from the waveguide 11 to the cabin 10, and the microwaves from the motor 13 are guided. By rotating the rotary disk 14 by driving, the microwaves are transmitted through the slits 16 and stirred, and the microwaves are sent through the excitation port 7 to heat and cook the food 5 in the oven 2. It's summery. [Problems in the background art] However, the microwave excitation device in the high-frequency heating cooking device described above is for microwave excitation using a substantially cross-shaped microwave passage formed in the radial direction of the rotating disk 14 with a constant width. Due to the formation of the slit 16, the same microwave is always radiated into the oven 2 during cooking, and if the microwave is uneven in the radial direction, Not only does the heating temperature become non-uniform, but the same microwave is always radiated, which reduces the change in the impedance of the oven 2 as seen from the antenna 12a of the magnetron 12 when no load is applied. Sparks are generated due to electric field concentration on various parts (for example, heaters) in the oven 2, and the oven 2
There is a risk of damaging internal parts. [Purpose of the invention] In order to solve the above-mentioned difficulties, the present invention provides slits in the radial direction of a rotating disk that excites microwaves, and also forms perpendicular slits to the slits in the rotating disk to excite microwaves. To make the heating temperature of the object 5 uniform, to eliminate sparks caused by electric field concentration in the oven, to prevent damage to parts in the oven, and to improve reliability and safety. The purpose of the present invention is to provide a high-frequency heating cooking device. [Summary of the invention] In this invention, a rotating disk is rotatably provided in the oven frame forming the oven, and a radial slit that transmits microwaves is provided in the rotating disk, and a radial slit that is perpendicular to the slit is provided in the rotating disk. It is constructed by forming a slit. [Embodiment of the invention] Hereinafter, the present invention will be described with reference to an illustrated embodiment. In addition, the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example. In FIGS. 1 and 4, reference numeral 1 denotes a box-shaped case body, and inside this case body 1 is provided an oven frame 4 that separates and forms an oven 2 and a machine room 3. The top plate 4a of the oven frame 4 is provided with an excitation port 7. Further, the top plate 4a located directly below the excitation port 7 is provided with a partition plate 8 made of a low dielectric material, and the top plate 4a located directly above the excitation port 7 is provided with a cavity frame 9. It is provided so as to form a cabin 10. Further, a waveguide 11 is horizontally attached to one side of the cavity frame 9, and a magnetron 12 is attached to one end 11a of the waveguide 11 with its antenna 12a protruding. has been done. On the other hand, the cavity frame 9 where the excitation port 7 is located
The motor 13 that constitutes a part of the star fan is shown in FIG.
A rotating shaft 13 of this motor 13 is provided.
As shown in FIG. 4, a rotary disk 14 made of a low dielectric material is rotatably mounted on the shaft a.
Further, this rotating disk 14 is provided with a slit 16 formed in a substantially cross shape in the radial direction by a plurality of metal plates 15, and this one slit 16 is located at a distance of λ/2 from the center of the rotating disk 14. (where λ is the microwave), approximately λ/4 to orthogonal to this
A slit 17 having a length of λ/2 is formed. Therefore, when cooking in the microwave, by energizing the magnetron 12, microwaves from the antenna 12a of the magnetron 12 are guided from the waveguide 11 to the cabin 10, and the rotating disk 14 is driven by the motor 13. By rotating the microwave oven, the microwaves are passed through the slits 16 and 17 and stirred, and the food 5 in the oven 2 is heated through the excitation port 7. In particular, since the slits 17 according to the present invention are formed perpendicularly to the radial slits 16, a wide variety of microwaves are emitted into the oven 2, causing unevenness in the microwaves in the radial direction. By heating the food 5 in the oven 2 uniformly and constantly changing microwaves, the oven 2 can be heated evenly when there is no load.
This increases the change in impedance within the capacitor and prevents sparks from occurring due to electric field concentration. Next, the heating temperature distribution in the oven 2 was compared and measured for the specific example described above and the example according to the present invention. That is, as shown in FIG. 5, five beakers 5' each filled with 300 c.c. of water are lined up on a shelf 6 as a load of food to be cooked. When irradiated for 2 minutes and 30 seconds, the temperature rise of the water in each beaker 5' was measured,
As a result of calculating this temperature distribution rate using the following formula (1),
The smaller the temperature distribution ratio, the better the uniform heating of the food to be cooked 5. Temperature distribution rate = Maximum temperature rise value - Minimum temperature rise value / Average temperature rise value × 100%...(1) Therefore, the results of calculation using the above formula (1) are shown in Table 1.
As shown in the figure, the heating temperature distribution of the present invention was made uniform, and the purpose was greatly improved.

[Effect of idea]

As described above, according to the present invention, the oven 2
An excitation port 7 is bored in the top plate of the oven frame 4 forming the oven frame 4, and a cavity frame 9 is provided to form a cabin 10 on the top plate 4a where the excitation port 7 is located. A waveguide 11 is attached to the waveguide 11, a magnetron 12 is attached to one end of the waveguide 11, and a rotating disk 14 made of a low dielectric material is rotatably provided in the cavity frame 9. A substantially cross-shaped slit 16 is provided in the radial direction of a plurality of fan-shaped metal plates on the plate 14 through which microwaves are transmitted, and a slit 17 that is perpendicular to the slit 16 and has a stopper is formed in the slit 16. The stop slit 17 is the same as the above slit 1.
By actively assisting the diffusion of the microwaves from 6, the microwaves are uniformly diffused and supplied into the oven 2, and the food to be cooked in the oven 2 can be evenly heated and cooked. Moreover, it has practical effects such as not only being able to radiate a wide variety of microwaves to the oven 2, but also being able to prevent sparks due to electric field concentration, and also being easy to process because the slit shape is simple. It has the following.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the high-frequency heating cooking device that has already been proposed, FIG. 2 is a plan view of the same as above, FIG. 3 is a plan view of a rotating disk to be incorporated into the high-frequency heating cooking device, and FIG. 4 5 is a plan view of a rotating disk incorporated in the high-frequency heating cooking apparatus according to the present invention, FIG. 5 is a plan view of an experiment with beakers placed on a shelf board, and FIGS. 6 to 9 are FIG. 6 is a diagram showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1...Case body, 2...Oven, 3...Machine room, 4...Oven frame, 7...Excitation port, 8...
...Partition plate, 9...Cavity frame, 11...Waveguide, 1
2... Magnetron, 13... Motor, 13a...
...Rotating shaft, 14... Rotating plate, 15... Metal plate, 1
6,17...slit.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An excitation port is provided in the top plate of an oven frame forming an oven, a cavity frame is provided to form a cabin on the top plate where the excitation port is located, and A waveguide is attached to the hollow frame body, a magnetron is attached to one end of the waveguide, a rotating disk made of a low dielectric material is rotatably provided in the hollow frame body, and a sector-shaped rotating disk is attached to the hollow frame body. A high-frequency heating cooking device characterized in that a plurality of metal plates forming a plurality of metal plates are provided with approximately cross-shaped slits in the radial direction through which microwaves are transmitted, and a stopper slit orthogonal to the slits is formed in the slits. 2. A radial slit located at a distance of λ/2 from the center of the rotating disk and approximately λ/4 perpendicular to the radial slit.
The high-frequency heating cooking device according to claim 1, characterized in that a slit having a length of ~λ/2 is formed.