JPS601790A - Cooking device - 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 a cooking device such as a microwave oven or an oven range that heats food using microwaves generated by a magnetron. Regarding cooking equipment.

When heating food using microwaves, if pure standing wave mode microwaves are supplied into the cooking chamber containing the food to be cooked, the food will be heated unevenly. The next mode of microwave is supplied to prevent uneven heating.

That is, as shown in FIG. 1, which is a schematic cross-sectional view of a conventional general microwave oven, the microwaves generated by a magnetron 1 pass through a waveguide 2 provided on the top surface of a cooking chamber 3 and then pass through a slit. S is supplied to the cooking chamber 3.

Then, the food F is placed on a turntable 4 that is rotationally driven by a motor (not shown) and rotated, and the microwave is disturbed by a stirrer 5 provided on the top surface of the cooking chamber 3 to change the electric field distribution. to ensure that food F is heated evenly.

However, even if the above-mentioned measures are taken, the reality is that it is still not enough to eliminate uneven heating, and in this configuration, the device for rotating the stirrer 5 and turntable 4 is In addition, there were problems such as the need for electric power to drive these devices.

The present invention was made in view of these circumstances, and
By using multiple waveguides to guide microwaves from the magnetron to the cooking chamber, uneven heating can be eliminated by supplying microwaves with different wavelengths and phase speeds to the cooking chamber due to differences in the widthwise dimensions of these waveguides. The purpose is to provide a cooking device that is designed to meet the needs of customers.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.

FIG. 2 is a schematic sectional view of the cooking device according to the present invention, in which the food F placed on the turntable 4 is placed on the magnetron 1.
The microwaves generated in the main wave tube 20. Sub-waveguide 21
．． Heating is achieved by supplying power to the cooking chamber 3 from a slit-shaped microwave supply port through a waveguide section 2 consisting of 22 while being stirred by a stirrer 5.

FIG. 3 is a partially cutaway perspective view of the waveguide section 2 of the device of the present invention.

The waveguide section 2 consists of a main waveguide 20 and sub-waveguides 21 and 22 provided on its lower surface, that is, on the cooking chamber 3 side.

The main waveguide 20 is provided on the top surface of the cooking chamber 3 and has a widthwise dimension of a. It has a substantially rectangular cylindrical shape with a rectangular cross section, and one end extends to the side of the cooking chamber 3, and the magnetron 1 is provided on the lower surface of the magnetron 1, and its antenna is connected to the bottom plate B of the main wave tube 20.
It protrudes from the main wave tube 20 into the main wave tube 20. Further, the upper surface of the other end is sloped and connected to the top surface of the cooking chamber 3.

Then, from the magnetron 1 side to the bottom plate B of the main wave tube 20, that is, to the side of the cooking chamber 3,
, S2 (length a.), S3 (length ao) and S4
(length a2), and the elongated direction of each slit is the width direction of the main wave tube 20, and the length is ao>a2>al.

A scrubber 5 is rotatably provided between the sulins S2 and 83 at the center of the top surface of the cooking chamber 3.

Further, on the lower surface side of the bottom plate B1 between the slit S1 and the slit S2, that is, on the cooking chamber 3 side, a slit 82 side cross section is opened from the edge of the slit S1 on the magnetron 1 side to the edge of the slit S2 on the magnetron 1 side. Sub-waveguide 2 in the shape of a flat hollow rectangular parallelepiped with a rectangular cross section of width direction dimension a1
1 is further formed on the lower surface of the bottom plate B3 between the slits S3 and S, from the edge of the slit S3 far from the magnetron 1 to the edge of the slit S far from the magnetron 1. Open the slit sq.
A hollow prismatic sub-waveguide 22 with a widthwise dimension a2 and a trapezoidal side view with a lower side surface having a sloped surface is provided.

The sub-waveguide 21 communicates with the main waveguide 20 through the slit S1 and the cooking chamber 3 through the opening on the S2 side, and the sub-waveguide 22 communicates with the main waveguide 20 through the slit S4. It communicates with the cooking chamber 3 through the S3 side opening.

Further, the sub waveguides 2t and 22 have widthwise dimensions ar l a2 (a
o>a2>al), so the slit S2
The microwaves fed to the cooking chamber 3 from +S3 and the sub-waveguides 21 and 22 have different phases.

FIG. 4 is a schematic explanatory diagram showing the phase of microwaves in the waveguide section 2. FIG. The microwave P1 generated by the magnetron 1 is supplied to the cooking chamber 3 as a microwave P2 through the main waveguide 20 and the slit S1 via the sub waveguide 21, and is also supplied to the cooking chamber 3 from the slit S2. .

In this case, the relationship shown in the following equation exists between the wavelength λg and the phase velocity vp in the waveguide.

vp=f・λg Where, λ: Free space wavelength a: Waveguide width (TEIO mode) f: Frequency (constant: 2450 MIIZ) The wavelength λg in the waveguide is determined by the waveguide width a, and the phase velocity v
Since the frequency f is constant, p is determined by the wavelength λg. That is, if each waveguide width a is different, each waveguide 20, 21 .
The wavelength λg and phase velocity vp within 22 are different.

Therefore, the microwave P1 supplied from the slit S2 to the cooking chamber 3 and the microwave P2 from the sub-waveguide 21 have different phases from each other, and similarly the microwave P1 supplied from the slit S3 to the cooking chamber 3 has a different phase. The wave P1 and the microwave P3 supplied to the cooking chamber 3 via the sub-waveguide 22 have different phases. Also, magnetron 1 and slits S2 and 8
The phase of the microwaves P1 and Pl' differs due to the difference in the distance between the slits S1 and 83, and the phase of the microwaves P2 and B3 also differs due to the difference in the distance between the slits S1 and 83.
Four types of microwaves P+, P+ with different phases are sent to the cooking chamber 3.
', B2. B3 is supplied and a very complex higher-order mode is generated.

and the main waveguide 20 between Surin F S 21 S 3
Combined with the microwave disturbance effect by the stirrer 5 provided on the lower surface of the bottom plate B2, extremely complex high-order mode microwaves are supplied to the cooking chamber 3.

Therefore, in the device of this invention, the microwaves generated by the magnetron 1 are transmitted through the slit S2. Power is supplied from B3 to the cooking chamber 3 and from the slits S+ and S2 to the cooking chamber 3 via the sub-waveguides 21 and 22, which have different width dimensions from the main waveguide 20, resulting in a further different phase. , Therefore, the microwaves fed into the cooking chamber 3 have a very complicated high-order mode.

As detailed above, the cooking appliance according to the present invention is a cooking appliance in which microwaves generated by a magnetron are supplied to a cooking chamber through a waveguide, and the waveguide has a plurality of Since it is equipped with a waveguide, microwaves in a complicated high-order mode are fed into the cooking chamber, and the present invention has excellent effects such as preventing uneven heating.

In the above embodiment, two sub-waveguides are provided, but it goes without saying that one or three or more sub-waveguides may be provided.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a general cooking device having a magnetron, Fig. 2 is a schematic sectional view of the device of the present invention, Fig. 3 is a partially cutaway perspective view of its waveguide section, and Fig. 4 FIG. 2 is an explanatory diagram showing the phase of microwaves within a waveguide. 1...Magnetron 2...Waveguide section 3...Heating cooking chamber 20...Main waveguide 21, 22...Sub waveguide patent Applicant Sanyo Electric Co., Ltd. Agent Patent attorney Kawa No Nobo No. 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] ], A cooking device configured to feed microwaves generated by a magnetron to a cooking chamber via a waveguide, characterized in that the waveguide includes a plurality of waveguides having different widthwise dimensions. Cooking device.