JPH11167986A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the heating efficiency of the high frequency heating device of a microwave oven having a heating chamber of width large with respect to a depth dimension. SOLUTION: Since the width dimension of a heating chamber bottom wall 19 is larger than the depth dimension, an elliptically shaped drawn portion 20 protruding outside a heating chamber 16 is formed on the heating chamber bottom wall 19, a rotating radiation body 23 is positioned in the center thereof, and one pair of planar metal fittings 26, 27 installing the elliptical shape drawn portion 20 are formed in the right and left direction of the width direction on the heating chamber bottom wall 19 of the rotating radiation body 23. Therefore, the high frequency electric wave from a magnetron 25 oscillating a high frequency is propagated into the heating chamber 16, the high frequency electric wave is radiated as rotating by 360 degrees by a coaxial antenna 22 and a rotating radiation body 23, and the high frequency electric wave is radiated from the periphery of the rotating radiation body 23 and both side semicircular opening portions of the elliptically shaped drawn portion 20. Thereby, the food stuff to be cooked 17 is cooked uniformly uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the heating efficiency of a high-frequency heating device such as a microwave oven, and more particularly to a suspended high-frequency heating device in which the width of a heating chamber is large relative to the depth. .

[0002]

2. Description of the Related Art A conventional high-frequency heating apparatus of this type is generally the one described in Japanese Patent Application Laid-Open No. Hei 3-15190. In this high-frequency heating apparatus, a heating chamber 1 is provided in a main body as shown in a sectional view of a main part of the heating chamber in FIG. The right and left coaxial antennas 4 and 5 and the right electric field stirring blade are provided on the upper wall 2 side at positions symmetrical with respect to the center of the front, rear, left and right directions and at different center distances between the upper wall 2 side and the bottom wall 3 side. 6 and a left electric field stirring blade 7, respectively, and a high frequency power supply means provided with a right coaxial antenna 8 and a left coaxial antenna 9 and a right electric field stirring blade 10 and a left electric field stirring blade 11 are provided on the bottom wall side. ing. Furthermore, around the high-frequency power supply means,
The upper wall right narrowing portion 12, the upper wall left narrowing portion 13, and the bottom wall right narrowing portion 14 and the bottom wall left narrowing portion 15 which are independent and circularly protrude outside the heating chamber 1 are provided respectively. 7 shows a right electric field stirring blade 10 and a left stirring blade 11 on the bottom wall 3 side, and a bottom wall right narrowing portion 14 and a bottom wall left narrowing portion 15 protruding outside the heating chamber 1 in a perspective view of the bottom wall of the heating chamber in FIG. . Also, in the oscillation phase of the magnetron which performs half-wave oscillation related to the excitation of the high frequency to the high frequency supply means, the opposing opposite sides, that is, the heating chamber upper wall 2 right and the heating chamber bottom wall 3 left or the heating chamber upper wall 2 left. The oscillation phases of the right and left heating chamber bottom walls 3 are in phase, and the oscillation phases of the magnetrons that excite high frequencies to the high frequency power supply means on the left and right sides of the heating chamber top wall 2 or the heating chamber bottom wall 3 are opposite phases. The position was shifted.

[0003]

However, the above-mentioned conventional high-frequency heating apparatus requires four sets of high-frequency power supply means regardless of the magnitude of the high-frequency output. That is, four magnetrons, a waveguide, a coaxial antenna, and an electric field agitating blade are required, and there is a problem in that they are incorporated into a heating chamber and a power supply for configuring the magnetron is complicated.
In recent years, the high-frequency output per magnetron has been increased by 100% by improving the performance of the magnetron and the cooling performance.
It is becoming possible to output 0W. Therefore, when a high-frequency heating device having a high-frequency output of 2000 W or less is configured, two magnetrons have a sufficient high-frequency output capability, and two sets of high-frequency power supply means are sufficient.
However, if the width dimension of the bottom wall of the heating chamber is substantially the same as the depth dimension, as shown in the sectional view of the heating chamber in FIG.
A set of high-frequency power supply means is formed above and below the heating chamber, and an upper wall narrowing portion 1 protruding outside the circular heating chamber around the high-frequency power supply means.
The object to be heated can be evenly and uniformly heated only by providing the lower wall 6 and the bottom wall narrowing section 17, but when the width of the bottom wall of the heating chamber is larger than the depth, two sets of high-frequency power supply means are required. Even if a narrowed section is provided above and below the heating chamber and a protruding portion is provided around the high-frequency power supply means and protrudes outside the circular heating chamber, the bottom wall of the heating chamber is rectangular, so that high-frequency radio waves can be uniformly applied to the object to be heated. There is a problem that it is difficult to uniformly heat the object to be heated.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heating chamber in which the width of the bottom wall of the heating chamber is larger than the depth dimension, and the bottom wall of the heating chamber protrudes out of the heating chamber. Form an oval-shaped throttle section parallel to the width, position the coaxial antenna and the rotating radiator that are rotated by an electric motor approximately at their centers, and form an oval-shaped aperture on the left and right in the width direction of the bottom wall of the heating chamber of the rotating radiator. It comprises at least one pair of flat metal fittings installed on the part.

According to the above invention, even if the width of the bottom wall of the heating chamber is larger than the depth, the plane of the rotating radiator is provided in the narrow oval portion on the left and right in the width direction of the bottom wall of the heating chamber. Since at least one pair of brackets is configured, a high-frequency wave from a magnetron that oscillates a high-frequency wave is propagated through a waveguide into a heating chamber, and the high-frequency wave is radiated by a coaxial antenna and a rotating radiator while rotating 360 degrees. By radiating the high-frequency radio waves from the semicircular openings around the rotating radiator and on both sides of the oval-shaped narrowed portion, the object to be cooked can be uniformly heated.

[0006] Further, at least one pair of flat metal fittings for arranging an oval-shaped narrowed portion on the left and right in the width direction of the bottom wall of the heating chamber of the rotating radiator is configured.
Tunnel-shaped or "U" shaped tunnel-type brackets are formed on the left and right sides of the oval-shaped narrowed section in the width direction of the bottom wall of the heating chamber of the rotating radiator provided at the center of the oval-shaped narrowed section. Even so, it is possible to uniformly heat the object to be cooked.

Furthermore, a coaxial antenna for radiating high-frequency radio waves into the heating chamber and a rotating radiator are provided at the center of the upper wall of the heating chamber, so that high-frequency radio waves from the coaxial antenna on the bottom wall of the heating chamber and the rotating radiator are provided. In addition, the coaxial antenna and the rotating radiator on the upper wall of the heating chamber are radiated to the object to be heated in combination with the high-frequency radio wave propagated from the magnetron through the waveguide, so that the object to be cooked can be evenly and uniformly heated. it can.

[0008]

DETAILED DESCRIPTION OF THE INVENTION A high-frequency heating apparatus according to a first aspect of the present invention includes a heating chamber in which a width of a bottom wall of a heating chamber for storing an object to be heated is larger than a depth dimension, a magnetron for oscillating high frequency, A waveguide that propagates a high-frequency wave from the magnetron to the heating chamber, a coaxial antenna that radiates a high-frequency wave propagated by the waveguide into the heating chamber, an electric motor that rotates the coaxial antenna, and the coaxial antenna. A rotating radiator fixed to an antenna, and a bottom wall of the heating chamber is formed with an oval narrowed portion protruding out of the heating chamber and parallel to a width of the bottom wall, and the rotating radiator is substantially centered at the center thereof. , And at least one pair of flat metal fittings extending over the elliptical narrowed portion on the left and right of the rotating radiator in the width direction of the bottom wall of the heating chamber.

[0009] A high-frequency wave from a magnetron that oscillates a high-frequency wave is propagated through a waveguide in a heating chamber, and the high-frequency wave is radiated by a coaxial antenna and a rotating radiator while being rotated by 360 degrees. By radiating light from the periphery of the body and the semicircular openings on both sides of the oval-shaped narrowed portion, the object to be cooked can be uniformly heated.

In the high frequency heating apparatus according to a second aspect of the present invention, the width dimension of the bottom wall of the heating chamber is larger than the depth dimension, and protrudes out of the heating chamber at the bottom wall of the heating chamber and is parallel to the width of the bottom wall. At least a pair of “U”
The metal fitting in the shape of the "downside-down" tunnel or the "U-shape" downside tunnel is installed at the approximate center of the oval-shaped narrowed portion. It has left and right.

Then, a high-frequency radio wave from a magnetron that oscillates a high frequency is propagated through a waveguide into the heating chamber, and the high-frequency radio wave is radiated by a coaxial antenna and a rotating radiator while rotating by 360 degrees. By radiating light from the periphery of the body and the semicircular openings on both sides of the oval-shaped narrowed portion, the object to be cooked can be uniformly heated.

A high-frequency heating apparatus according to a third aspect of the present invention further comprises a coaxial antenna and a rotating radiator also at the center of the upper wall surface of the heating chamber.

The object to be heated is combined with a high-frequency radio wave from the coaxial antenna and the rotating radiator on the bottom wall of the heating chamber, and a high-frequency radio wave transmitted from the magnetron to the coaxial antenna and the rotating radiator on the upper wall of the heating chamber. Will be radiated to
The object to be cooked can be evenly and uniformly heated.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic perspective view of a bottom portion of a heating chamber showing a high-frequency heating apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a schematic perspective view of a bottom wall of the heating chamber of the high-frequency heating apparatus.

In FIG. 1 and FIG. 2, reference numeral 16 denotes a heating chamber, and a lower portion of the heating chamber 16 is provided with a mounting table 18 made of a dielectric for mounting an object 17 to be cooked. 19
A coaxial antenna 22 connected to a dielectric output shaft of an electric motor 21 and a rotary radiator 2 fixed thereto are formed at the center thereof with an oval narrowed portion 20 protruding outside the heating chamber 16.
3 are provided. Outside the bottom wall 19 of the heating chamber,
A waveguide 24 for guiding high-frequency radio waves is fixed to the bottom wall 19 of the heating chamber, and a motor 21 connected to a coaxial antenna 22 by an output shaft is fixed to a lower portion of the center of the heating chamber 16 of the waveguide 24. A magnetron 25 is fixed to the other end of the waveguide 24. Moreover, a right plane metal fitting 26 and a left plane metal fitting 27 for arranging the oval-shaped narrowed portions 20 on the left and right in the width direction of the bottom wall 19 of the rotating radiator 23 are provided.

Next, the operation and operation will be described. High-frequency radio waves from a magnetron 25 that oscillates high-frequency waves are guided by a waveguide 24 to a coaxial antenna 22 that is high-frequency electric field-coupled to the heating chamber 16, and radiated to the heating chamber 16 by a rotating radiator 23. The rotating radiator 23 is a motor 2
1, the high-frequency electric wave is radiated at an angle of 360 degrees around the rotating radiator 23 of the bottom wall 19 of the heating chamber, and a semicircle formed by an oval-shaped narrowed portion 20 and a right-side flat metal fitting 26. High-frequency radio waves are radiated from a semicircular opening composed of a conical opening and an oval-shaped aperture 20 and a left flat metal fitting 27,
High-frequency radio waves can be evenly applied to the object 17 placed on the mounting table 18.

(Embodiment 2) FIG. 3 is a sectional view of a main part of a heating chamber portion of a high-frequency heating apparatus according to Embodiment 2 of the present invention. FIG. 4 is a schematic perspective view of the bottom of the heating chamber showing the high-frequency heating device.
The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

The second embodiment differs from the first embodiment in the configuration of the inside of the oval-shaped narrowed portion 20. In the first embodiment, a right-plane-shaped metal fitting 26 on which the oval-shaped narrowed portion 20 is installed is provided. The left flat metal fitting 27 is provided.
The "U-shaped" face-down tunnel-shaped metal fittings 30 and 31 are provided in the oval narrowed part 20 on the right and left sides of the rotary radiator 23 provided at the center of the elliptical narrowed part in the width direction of the bottom wall of the heating chamber. Have been.

Next, the operation and operation will be described. The high-frequency electric wave from the magnetron which oscillates the high-frequency
4 guides the coaxial antenna 22 to the high frequency electric field coupling with the heating chamber 16, and radiates high frequency radio waves to the heating chamber 16 by the rotating radiator 29. Further, since the rotating radiator 23 is rotated by the electric motor 21, the high-frequency radio waves are radiated at an angle of 360 degrees around the rotating radiator 23 on the bottom wall 19 of the heating chamber, and the bottom of the heating chamber of the oval-shaped narrowed portion 20. A high-frequency radio wave passes through a metal fitting 30 and a metal fitting 31 in the shape of a “U-shaped” protruding tunnel provided on the left and right sides in the width direction of the wall 19, and radiates to both sides of the oval-shaped diaphragm 20. Therefore, it is possible to uniformly irradiate the high-frequency radio waves to the object placed on the mounting table.

Although the shape of the metal fitting is a "U-shape" face-down tunnel shape, it is also possible to form a "U-shape" face-down tunnel shape.

(Embodiment 3) FIG. 5 is a sectional view of a heating chamber showing a high-frequency heating apparatus according to Embodiment 3 of the present invention. Example 3
The difference from the first embodiment is that a rotating radiator 33 is added to the center of the upper wall 32 of the heating chamber. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. Heating room bottom wall 1
9 and a high-frequency radio wave from a semicircular opening formed by an oval-shaped narrowed portion 20 and left and right flat metal fittings 26 and 27 provided on the bottom wall 19 of the heating chamber. It is the same that the object to be cooked placed on the mounting table is evenly irradiated with the high-frequency radio wave by radiating, but the magnetron which oscillates the high frequency by adding the rotating radiator 33 also to the upper wall 32 of the heating chamber. The high-frequency electric wave from 34 is guided to a coaxial antenna 36 that is high-frequency electric field-coupled to the heating chamber by the waveguide 35, and the high-frequency electric wave is radiated to the heating chamber by the rotating radiator 33. Further, since the rotating radiator 33 is rotated by the electric motor 37, the high-frequency radio wave is radiated at an angle of 360 degrees around the rotating radiator 33 on the upper wall 32 of the heating chamber, and the high-frequency wave is applied to the narrowed portion 38 of the upper wall 32 of the heating chamber. By radiating the radio waves, the object 17 placed on the mounting table 18 can be evenly and uniformly irradiated with the high-frequency radio waves in combination with the high-frequency radio waves from the rotating radiator 23 on the bottom wall 19 of the heating chamber.

[0024]

As described above, the high-frequency heating device according to the first aspect of the present invention has the elliptical narrowed portion of the bottom wall of the heating chamber, and the left and right sides of the rotating radiator in the width direction of the bottom wall of the heating chamber. Even if the width of the heating chamber is larger than the depth, the high-frequency wave from the magnetron that oscillates high-frequency waves is generated even if the width of the heating chamber is larger than the depth. The high-frequency radio wave is radiated by the rotating radiator while rotating by 360 degrees, and the high-frequency radio wave is transmitted from the semicircular opening around the rotary radiator and on both sides of the oval-shaped aperture. By radiating, the object to be cooked can be uniformly heated.

Further, the high-frequency heating device according to claim 2 is
At least one pair of “U-shaped” face-down tunnels, or “C”, is provided on the left and right sides of the oval-shaped narrowed portion of the rotating radiator in the width direction of the bottom wall of the heated chamber. Since the T-shaped tunnel-shaped metal fitting is provided, high-frequency radio waves from a magnetron that oscillates high-frequency waves are propagated through a waveguide into a heating chamber, and the high-frequency radio waves are radiated by a rotating radiator while rotating 360 degrees. High-frequency radio waves pass through the lower part of the “U-shaped” protruding tunnel-shaped or “U-shaped” protruding tunnel-shaped bracket of the oval-shaped aperture, and radiate to both sides of the oval-shaped aperture. In addition, the object to be cooked can be uniformly heated.

Further, the high-frequency heating device according to claim 3 is
By radiating high-frequency radio waves from a rotating radiator provided on the bottom wall of the heating chamber, and high-frequency radio waves from a semicircular opening made up of an oval-shaped narrowed section and left and right flat metal fittings provided on the bottom plate of the heating chamber The same applies to uniformly irradiating high-frequency radio waves to the object placed on the mounting table, but by adding a rotating radiator also to the upper wall of the heating chamber, high-frequency radio waves from the magnetron that oscillates high frequency are It is guided by a waveguide to a coaxial antenna which is coupled to the heating chamber by a high-frequency electric field, and radiates high-frequency waves to the heating chamber by a rotating radiator. In addition, since the rotating radiator is rotated by an electric motor, the high-frequency radio wave is radiated at an angle of 360 degrees around the rotating radiator on the upper wall of the heating chamber, and the high-frequency radio wave is radiated to the constricted portion of the upper wall of the heating chamber. In combination with the high-frequency radio waves from the rotating radiator on the bottom wall of the heating chamber, the high-frequency radio waves can be evenly and uniformly applied to the object placed on the mounting table to heat the object.

[Brief description of the drawings]

FIG. 1 is a sectional view of a heating chamber portion of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of a bottom wall of a heating chamber of the high-frequency heating device.

FIG. 3 is a cross-sectional view of a main part of a heating chamber of a high-frequency heating device according to a second embodiment of the present invention.

FIG. 4 is a schematic perspective view of a bottom wall of a heating chamber of the high-frequency heating device.

FIG. 5 is a sectional view of a heating chamber portion of a high-frequency heating device according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a heating chamber of a conventional high-frequency heater.

FIG. 7 is a schematic perspective view of a bottom wall of a heating chamber of a conventional high-frequency heater.

FIG. 8 is a sectional view of a heating chamber of a conventional high-frequency heater.

FIG. 9 is a schematic perspective view of a bottom wall of a heating chamber of a conventional high-frequency heater.

[Explanation of symbols]

 Reference Signs List 16 heating chamber 17 object to be heated 19 bottom wall of heating chamber 20 throttle section 21 motor 22 coaxial antenna 23 rotating radiator 24 waveguide 25 magnetron 26, 27 planar metal fitting

Claims (3)

[Claims] 1. A heating chamber in which a bottom wall of a heating chamber for accommodating an object to be heated is larger than a depth dimension, a magnetron that oscillates a high frequency, and a waveguide that propagates a high-frequency radio wave from the magnetron to the heating chamber. A tube, a coaxial antenna that radiates high-frequency radio waves propagated by the waveguide into the heating chamber, an electric motor that rotates the coaxial antenna, and a rotating radiator fixed to the coaxial antenna, the heating chamber An elliptical narrowed portion protruding out of the heating chamber and parallel to the width of the bottom wall is formed on the bottom wall of the rotary radiator, and the rotating radiator is positioned substantially at the center thereof, and the heating radiator is positioned in the heating chamber bottom wall width direction. A high-frequency heating device comprising at least one pair of flat metal fittings provided on the left and right sides of the oval-shaped narrowed portion. 2. A rotating radiator heating chamber bottom in which at least one pair of "U-shaped" face-down tunnel-shaped or "U-shaped" face-down tunnel-shaped fittings is provided substantially at the center of an oval-shaped narrowed portion. The high-frequency heating device according to claim 1, wherein the high-frequency heating device is configured on the left and right sides in the oval-shaped narrowed portion in the wall width direction. 3. The high-frequency heating apparatus according to claim 1, wherein a coaxial antenna and a rotating radiator are additionally provided at the center of the upper wall surface of the heating chamber.