JP2001035650A - Stirrer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirrer for a microwave oven, capable of uniformly stirring a high frequency in a heating chamber. SOLUTION: Power by a geared motor 14 is transmitted via a gear 14a whereby a spiral provided on a rotating shaft 2 is rotated to provide movement between projections at both ends. After one of the protrusions is reached, the geared motor 14 changes its rotating direction, followed by starting reverse rotation of a stirrer 1. The stirrer 1 with a reflecting plate is rotated by the air flow of a blowing fan for cooling electrical equipment parts. The reflecting plate is moved radially to the rotating shaft 2 with the centrifugal force developed in rotating the stirrer 1 and the self weight of the reflecting plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stirrer,
In particular, the present invention relates to a stirrer for agitating high frequency by rotating in a heating chamber of a high frequency heating device or in a waveguide for introducing high frequency from a magnetron into the heating chamber.

[0002]

2. Description of the Related Art Conventionally, a stirrer provided to stir microwaves in a heating chamber of a microwave oven only rotates at a fixed position about a rotation axis.

[0003]

In the conventional rotating operation of the stirrer, the microwave stirring pattern in the heating chamber becomes one pattern, and a sufficient stirring effect cannot be obtained. Therefore, there is a problem that large uneven heating occurs depending on the position in the heating chamber. The present invention has been made in order to solve the above-described problems, and the heating unevenness in the heating chamber is caused by rotating in a heating chamber or a waveguide for introducing a high frequency from a magnetron into the heating chamber during heating. It is an object of the present invention to provide a stirrer capable of reducing the stirrer.

[0004]

According to a first aspect of the present invention, a stirrer according to the present invention has a structure in which at least a part thereof can be freely moved in the axial direction of the rotating shaft or in the radial direction with respect to the rotating shaft while being rotated about the rotating shaft. It is provided. A stirrer according to a second aspect of the present invention is the stirrer according to the first aspect, wherein the stirrer is rotated by the power of a geared motor, and the rotary shaft has a helix, and a stopping means is provided at both ends thereof to be fitted to the helix. . The stirrer according to a third aspect is the stirrer according to the first aspect, wherein the stirrer is provided in a vertical direction, and a reflecting plate for reflecting a high frequency is reciprocated through a slit provided in a radial direction with respect to a rotation axis. The stirrer according to claim 4 is the stirrer according to claim 3, wherein the stirrer is rotated by wind from a blower motor, and the reflector moves the slit by centrifugal force generated when the stirrer rotates and its own weight during non-rotation. Things. A stirrer according to a fifth aspect is the stirrer according to the fourth aspect, wherein the stirrer according to the fourth aspect is provided in a power supply port portion for supplying a high frequency radiated from inside the waveguide into the heating chamber in a vertical direction. The stirrer according to claim 6 is the stirrer according to claim 2, wherein the outer periphery is fitted with a gear, the rotating shaft is moved while rotating, and when reaching one of the stopping means, the rotation direction of the geared motor is changed through the gear. Accordingly, the stirrer itself is also characterized by changing the rotation direction.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. In the following embodiments, a microwave oven will be described as an example, but the present invention is not limited to this.
It is applicable to a heating device such as a toaster range and a microwave oven. Referring to FIG. 1 to FIG. 4, one embodiment of the present invention will be described.
A heating chamber 10 surrounded by a main body, a waveguide 12 attached so as to cover the power supply port 11, a magnetron 13 attached to an end of the waveguide 12, and generating a high frequency for heating food; A stirrer 1 rotatably provided at the power supply port 11 for stirring high frequency, a gear motor 14 for driving the stirrer 1, and a turn provided rotatably by a motor 15 a in a lower part of the heating chamber 10. It comprises a table 15 and a protective cover 16 attached to the power supply port 11 for protecting the stirrer 1. The stirrer 1 is provided by cutting and raising an appropriate number of reflection plates 1a, and a gear 14 on the side of the gear motor 14 is provided.
It is formed in a sawtooth shape 1b so as to mesh with a. The stirrer 1 is attached to the protection cover 16 in a direction perpendicular to the rotating shaft 2 attached horizontally. That is,
The rotating shaft 2 is provided with projections 2c and 2c 'at predetermined intervals so that the movable range of the stirrer 1 becomes 2d, and a spiral 2b is formed on the outer periphery of the shaft between the projections. The shaft opening of the stirrer 1 is screwed into the spiral 2b to move the spiral 2b while rotating. When heating is started, the geared motor 14 starts rotating, and the rotation is transmitted to the gear 14a through the motor shaft 14b, and the gear also starts rotating. In the waveguide 12, the stirrer 1 fitted with the gear 14 a starts rotating, and reflects the high frequency that has passed from the magnetron 13 through the waveguide 12 while heating the heating chamber 10.
Irradiate inside. The stirrer 1 moves while traveling in one direction on the rotating shaft 2 and reaches one protrusion 2c. The reaching stirrer 1 cannot rotate any further, but the geared motor 1
Since the stirrer 4 continues to rotate, a force to rotate the stirrer is generated. When the force is transmitted to the motor shaft 14b through the gear 14a, the geared motor 14 starts to rotate in the reverse direction. Start spinning. During heating, the geared motor 14 repeats this operation. Next, the configuration of the fitting portion between the stirrer 1 and the gear 14a is shown in FIGS. That is, the stirrer 1 has a saw-tooth shape 1b fitted to the outer periphery of the gear 14a, and is fitted inside a square hole 17 provided in a part of the side wall of the waveguide 12. Square hole 17
Is slightly larger than the diameter of the gear 14a.
Since a is formed of, for example, a resin, no problem such as radio wave leakage occurs. As described above, the stirrer 1 changes the position in the axial direction, and reflects the high frequency while changing the rotation direction. Therefore, the case where the conventional stirrer only rotates the rotation axis at the center fixed position is used. In comparison, when the stirrer 1 of the present invention is used, the high frequency for heating the food is almost uniformly stirred in the heating chamber 10. In this embodiment, the shape of the stirring blade of the stirrer is not limited to this. The means for stopping the rotating shaft is not limited to the protrusion, and may be provided by another member. The mounting position of the stirrer does not have to be inside the waveguide and does not have to be mounted vertically. The square hole 17 of the waveguide may be elliptical. The fitting portion between the gear and the outer periphery of the stirrer is not limited to the saw-tooth shape 1b, and may be any shape as long as it engages with each other. FIG.
9 show the configuration of a stirrer 1 which is a second example of the embodiment of the present invention.

[0006] The stirrer 1 has slits 3a to 3d provided in a cross shape in the radial direction with respect to the rotation axis 2, and includes reflecting plates 4a to 4d for reflecting high frequencies. Reflector 4a ~
4d are attached to the slits 3a to 3d, respectively. The four reflecting plates 4a to 4d are formed of, for example, a metal such as aluminum, and have an anti-slope bent at an obtuse angle. Next, a method of attaching the reflection plates 4a to 4d will be described. The reflecting plate 4a passes through the slit 3a, the back side is formed to be bent, and the upper side is provided with protrusions 5a and 5b for preventing the reflecting plate 4a from dropping from the slit when moving. As will be described later, the stirrer 1 is mounted vertically, so that at least one of the reflecting plates 4a to 4d mounted on the stirrer 1 is near the center of the stirrer 1 and at least one is circular due to its own weight. It is located near the circumference. Next, with respect to the structure of the microwave oven to which the stirrer 1 is attached, only portions different from the first embodiment of FIG. 1 will be described.

The microwave oven 200 has a heating chamber 20 surrounded by a main body, a waveguide 12 and a magnetron 13 inside.
, A high-voltage transformer 27 and a blower motor 28 for cooling electrical components such as the magnetron. The waveguide 12 has near the bottom a myriad of small holes 12a through which air generated by the blower motor 28 passes. The air generated by the blower fan 28 driven by the blower motor not only cools the magnetron 13 and the high-voltage transformer 27 but also cools the hole 1 in the waveguide 12.
The stirrer 1 is rotated through 2a. When the heating is started, the high frequency is supplied from the magnetron 13 by the high voltage from the high voltage transformer 27. At the same time, the blower fan 28 rotates to cool the components, and the wind of the blower fan 28 that has passed through the hole 12 a in the waveguide 12 causes the stirrer 1 to start rotating about the rotation shaft 2. Since the stirrer 1 is rotated by a slight wind, the stirrer 1 rotates relatively slowly instead of rotating at a high speed as when rotating by driving a motor. During rotation, the reflectors 4a to 4d are centrifugally driven,
Slit 3a gradually toward the outer peripheral direction of stirrer 1
Move 3d. The high frequency supplied from the magnetron 13 and passing through the waveguide 12 irradiates the heating chamber 20 while being reflected by the reflecting plates 4a to 4d of the stirrer 1 moving while rotating. When the high-frequency heating is completed, the stirrer 1
Also stops rotating, and the reflection plates 4a to 4d
Due to its own weight, at least one is located near the center of the stirrer 1 and at least one is located near the circumference. As described above, since the stirrer 1 changes the positions of the reflectors 4a to 4d to reflect high frequencies, the stirrer 1 is compared with the case where a conventional stirrer rotating only at a center fixed position is used. With the use of 1, the high frequency for heating the food is almost uniformly stirred in the heating chamber 20. In this embodiment, the number of reflectors is not limited to four. Further, the shape is not limited to a plate shape. The bending of the anti-slope is not limited to an obtuse angle or may be omitted. The projection provided to prevent the projection from falling from the slit may be provided by another member. The rotational power of the stirrer is not limited to the wind of the blower motor, but may be another motor as long as the speed is low.

[0008]

According to the stirrer of the first aspect, when heating by the high frequency is started by the high frequency heating device, the stirrer reflects the high frequency while moving at least a part thereof.
The high frequency wave in the heating chamber is almost uniformly stirred, and uneven heating is reduced. According to the stirrer of the second aspect, the stirrer having a configuration in which the shaft is spirally engaged with the rotating shaft having the stopping means provided at both ends thereof moves between the stopping means, and the high frequency stirring pattern changes every moment. Therefore, it is possible to further advance the stirring. According to the stirrer of the third aspect, since the reflecting plate reciprocates through the slit provided in the radial direction with respect to the rotation axis and reflects the high frequency, the stirring can be further promoted. According to the stirrer of the fourth aspect, the reflector moves the slit by the centrifugal force generated when the stirrer rotates and the weight of the reflector itself and reflects the high frequency, so that the stirring can be further promoted.

According to the stirrer of the fifth aspect, the stirrer provided in the direction perpendicular to the power supply port for supplying the high-frequency wave into the heating chamber reflects the high-frequency wave radiated from the inside of the waveguide. Is possible.

According to the stirrer of the present invention, when the stirrer that moves between the stopping means of the rotating shaft while rotating reaches one of the stopping means, the geared motor as the power changes the rotation direction, and Accordingly, the stirrer itself reflects the high frequency while repeatedly changing the rotation direction, so that the stirring can be further promoted.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a microwave oven provided with a stirrer according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the stirrer shown in FIG. 1 as viewed from a side.

FIG. 3 is a top view of a fitting portion between the stirrer and the gear shown in FIG. 1;

FIG. 4 is a perspective view showing a configuration of a gear and a waveguide shown in FIG. 1;

FIG. 5 is a top view illustrating a configuration of a stirrer according to a second embodiment of the present invention.

6 is an enlarged perspective view of a part of the stirrer shown in FIG.

FIG. 7 is a sectional view of the stirrer and the reflector shown in FIG. 6;

8 is a front sectional view of a microwave oven to which the stirrer shown in FIGS. 5 to 7 is attached.

9 is a side view of the microwave oven shown in FIG. 8 as viewed from a side of an electrical component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirrer 2 Rotation axis 2b Spiral 2c, 2c 'Projection part 3a-3d Slit 4a-4d Reflector 12 Waveguide 14 Geared motor 14a Gear

Claims (6)

[Claims] 1. A stirrer having a rotating shaft for stirring a high frequency by rotating around a rotating shaft in a heating chamber of a high-frequency heating device or a waveguide for introducing a high frequency from a magnetron into the heating chamber. The stirrer according to claim 1, wherein at least a part of the stirrer is provided so as to be movable in an axial direction of the rotating shaft or in a radial direction with respect to the rotating shaft while rotating about the rotating shaft. 2. The stirrer according to claim 1, wherein the stirrer is rotated by the power of a geared motor, the rotating shaft has a helix and stop means are provided at both ends thereof, and the stirrer meshes with the helix. Stirrer. 3. The stirrer according to claim 1, wherein the stirrer is provided in a vertical direction, and a reflector for reflecting high frequency is mounted so as to reciprocate a slit provided in a radial direction with respect to the rotation axis. . 4. The stirrer is rotated by the wind from a blower motor that cools the magnetron, and the reflecting plate is rotated by the centrifugal force generated when the stirrer rotates and the weight of the reflecting plate itself. The stirrer according to claim 3, wherein the stirrer is moved. 5. The stirrer according to claim 4, wherein the stirrer is provided vertically in a power supply port for supplying a high frequency radiated from the inside of the waveguide into the heating chamber. 6. The stirrer whose outer periphery is fitted with a gear, moves while rotating, and reaches one of stop means of the rotating shaft, changes the rotation direction of the geared motor through the gear, and accompanying the gear, The stirrer according to claim 2, wherein the stirrer itself also changes the rotation direction.