JPS6293890A - Radio-frequency cooker - 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 [Technical Field of the Invention] The present invention relates to a high frequency cooking device for cooking food, and particularly to a harmonic (noise) attenuation device in this high frequency cooking device.

[Technical background of the invention]

As shown in FIGS. 6 and 7, this type of high-frequency heating cooking device that has already been proposed has a shelf board 2 on which a food to be cooked W is placed inside a cylindrical oven frame 1. An oven 3 is formed, an excitation port 4 is bored in the top plate 1a of the oven frame 1, and the top plate 1a is formed so as to cover the position of the excitation port 4, and the cross section thereof forms a rectangular cylindrical shape. A waveguide 5 is attached, and a magnetron 6 is installed at one end of the waveguide 5.
In addition, a partition plate 7 is provided upright in the middle of the waveguide 5, as shown in FIG. It is constructed by drilling.

Therefore, the above-mentioned high frequency heating cooking device row uses a wavelength of λ-122mm (2450M) from the magnetron 6 during cooking.
1-1z) is oscillated to the A-bun 3 through the resonant window 8 and the excitation port 4 of the waveguide 5, and the food W in the A-gin 3 is heated and cooked with this radio wave. Summer
(There is.

In particular, in the device λ consisting of the magnetron 6, J:
Radio waves oscillate a high frequency that constitutes the fundamental wave and harmonics that generate noise, and these harmonics, for example, oscillate noise and have a negative impact on household electrical equipment such as radios, televisions, and stereos. Therefore, the harmonic waves are attenuated and removed by passing through the resonance window hole 8, and only the high frequency waves effective for heating and cooking are passed through the excitation port 4. It is designed to be heated and cooked.

[Problems with back song technology]

However, the resonance window hole 8 of the high frequency heating cooking device described above
Theoretically, harmonics are attenuated to prevent the generation of noise, but b1 In practice, the slit width d1 of the resonance window hole 8
There is a case where sparks are generated at the periphery of the resonant window hole 8 during no-load oscillation, for example, when the J3 is made small enough to have no effect on the high frequency as the fundamental wave.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and has the following features:
The harmonics that cause noise are significantly reduced by 6A, and only high-frequency waves are introduced into the oven to improve thermal efficiency while cooking the food.DI+! The present invention provides a high frequency heating cooking device which is designed to prevent noise generation due to harmonics.

(Summary of the Invention) The present invention provides a partition plate that stands up in a waveguide equipped with magnetrons, a resonant window hole that is bored in the center of this partition plate, and a The partition plate is configured to attenuate high frequencies by installing a number of brackets each having a circumferential groove and a resonator.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention includes the same constituent members as those in the above-mentioned specific example.
The same reference numerals will be used for explanation.

In FIGS. 1 to 3, reference numeral 1 denotes a box-shaped oven frame, and inside this oven frame 1 is an oven 3 that accommodates shelf boards 2 on which objects W to be cooked are placed. An excitation port 4 is formed in the top plate 1a of the oven frame 1. Moreover, the above-mentioned top plate 1 where this excitation port 4 is located
A waveguide 5 having a rectangular cylindrical cross section is attached to cover the waveguide 5, and a magnetron 6 is installed at one end of the waveguide 5.

On the other hand, a partition plate 7 is provided upright in the middle of the waveguide 5, as shown in FIGS. A horizontally long resonant window hole 8 is bored. Further, on one side of the partition plate 7 near the resonant window hole 8, a choke fitting 9 having a diagonal circumferential groove 10 and a resonant opening 11 is attached around the resonant window hole 8. ing.

Therefore, during cooking, when the high frequency and harmonic radio waves from the magnetron 6 pass through the resonant window hole 8,
Most of the harmonics are attenuated, and the remaining harmonics are routed into the choke ring 10 formed by the choke fitting 9, thereby preventing noise generation due to the harmonics from the attenuation 16. Only high frequency waves are passed through the resonance port 11 and the excitation port 4 to heat and cook the food W in the oven 3.

In particular, the slit width dO of the resonance window hole 8 can be made large because the choke fitting 9 provides the circumferential groove 10 and the resonance opening 11, and the generation of sparks can be prevented with just 46 stops. become.

Next, another embodiment of the present invention shown in FIG. 4 and FIG. f
It is formed integrally by cutting and bending a T'J-riji metal fitting 9', and thereby the partition plate 7 can be formed in one step by press working so that the partition plate 7 can be formed in one step.

[Effect of the invention] As mentioned above, according to the present invention, the magnet 1-
A partition plate A is provided upright in the waveguide 5 with the long tube 6, and a resonant window hole 8 is bored in the center of the partition plate 7.
A circumferential groove 10 and a resonance opening 1 are installed in the partition plate 7 near the partition plate 7.
1 is provided, it is possible not only to prevent the generation of sparks at the periphery of the resonant window hole 8, but also to significantly subtract harmonics that cause noise generation. Furthermore, since the structure is made of B elements, assembly is easy, and labor savings can be achieved through mass production.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a high frequency heating cooking device according to the present invention;
FIG. 2 is an enlarged sectional view of the chain circle A section in FIG. 1, FIG. 3 is a left side view of the same as above, and FIGS. , FIG. 6 is a sectional view of an already proposed high-frequency heating cooking device, and FIG. 7 is an enlarged sectional view of chain circle B in FIG. 6. DESCRIPTION OF SYMBOLS 1...Oven frame body, 3...Oven, 4...Excitation port, 5...Waveguide, 6...Magnetone, 7...
・Partition plate, 8... Resonance window hole, 9... Chalk fitting,
10...Choke circumferential groove. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A partition plate is erected in a waveguide equipped with a magnetron,
A high-frequency cooking device characterized in that a resonant window hole is bored in the center of the partition plate, and a choke fitting having a choke circumferential groove and a resonant opening is provided on the partition plate near the resonant window hole. 2. The high-frequency heating cooking device according to claim 1, characterized in that a choke fitting having a resonance window hole, a choke groove, and a resonance opening is cut and integrally formed in the center of the partition plate. .