JPS642393Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a microwave oven equipped with a turntable and a stirrer fan.

(B) Prior Art In order to eliminate uneven heating of objects to be heated, microwave ovens are equipped with a stirrer fan for radio-wave stirring or a turntable for rotating objects to be heated. However, depending on the condition of the object to be heated, a stirrer fan or turntable alone may not be enough.
Uniform heating may be difficult.

Therefore, a microwave oven equipped with a stirrer fan and a turntable has been proposed, for example, as shown in Japanese Utility Model Publication No. 54-44846. This conventional example will now be briefly explained with reference to FIG. A shaft rod 3 is suspended downward from a turntable 2 which engages with a rotating shaft 1 and rotates. This shaft 3
A roller 4 supporting the turntable 2 is attached to the turntable 2, and a stirrer fan 5 rotating around the shaft rod 3 is attached to the turntable 2 and the cavity bottom plate 6.
be installed in between. An annular support body 7 attached to the stirrer fan 5 is brought into contact with an annular rail 8 centered on the rotating shaft 1, so that the stirrer fan 5 is rotated in conjunction with the rotation of the turntable 2.

However, in the above-mentioned microwave oven, the stirrer fan's driving method is linked to the slow rotation of the turntable, so the radio wave stirring effect of the stirrer fan is not sufficient, and the microwave oven does not have a built-in heater. In the case of heater heating using this heater, the circulation of hot air and the stirring effect were not particularly expected.

(c) Purpose of the invention The present invention has been made in view of the above-mentioned difficulties, and has a simple structure, and the stirrer fan is rotated at a rotational speed at which a sufficient stirring effect can be obtained. It is.

(d) Composition of the invention The invention consists of a turntable attached to a rotating shaft rotatably supported on the bottom plate of the cavity;
A stirrer fan disposed between the turntable and the bottom plate and a hot air generating means are provided, a fan shaft of the stirrer fan is offset from the rotation axis and rotatably supported on the bottom plate, The microwave oven is characterized in that the fan shaft and the rotary shaft are connected through a speed change means, and the stirrer fan is rotated by rotation of the rotary shaft.

(E) Embodiment An embodiment of the present invention will be described below in detail with reference to FIG.

A high frequency wave from a magnetron 11 is transmitted to a waveguide 1 in a cavity 10 built into an exterior (not shown).
2 and then irradiated. The top plate 13 of this cavity 10 is equipped with a heater 14 and a hot air circulation fan 15.
A fan motor 16 is provided to drive the fan. A bearing 19 that rotatably supports the rotating shaft 18 and a bearing 22 that rotatably supports the fan shaft 21 of the stirrer fan 20 are attached to the bottom plate 17 of the cavity 10. The fan shaft 21 is offset from the rotating shaft 18. Rotating axis 1
A turntable pedestal 23 is engaged with one end of the 8, and a turntable 25 on which a heated object 24 is placed is mounted on the pedestal 23, and the turntable 25 is rotated by the rotation of the rotating shaft 18. . The rotating shaft 18 is rotated by a motor (not shown) via a pulley 26 and a belt 27.

The stirrer fan 20 rotatably supports the fan shaft 21 with the bearing 22 described above, and is disposed between the turntable 25 and the bottom plate 17. The fan shaft 21 and the rotary shaft 18 are connected via a transmission means, and the rotation of the rotary shaft 18 causes the stirrer fan 20 to rotate. That is, in this embodiment, the driving pulley 28 is attached to the rotating shaft 18,
A driven pulley 29 is attached to the fan shaft 21, a belt 30 is passed between both pulleys 28 and 29, and the rotation of the rotary shaft 18 is changed in speed by both pulleys 28 and 29 and transmitted to the fan shaft 21, and the stirrer fan is 20
rotates at the optimum speed.

In this embodiment, a wrap transmission is used as the speed change means, but gears, friction wheels, etc. may also be used.

Therefore, in order to rotate the turntable 25,
When the rotary shaft 18 rotates via a motor (not shown), a belt 27, and a pulley 26, the fan shaft 21 is rotated by the drive pulley 28 of the rotary shaft 18, the driven pulley 29 of the fan shaft 21, and the belt 30, and the stirrer fan 20 rotates. As a result, the microwave is stirred by the reflecting piece of the stirrer fan 20. Therefore, the object to be heated is the turntable 25.
The synergistic effect of this and Starfant Fan 20 eliminates uneven heating.

In particular, in addition to stirring the radio waves that have gone under the turntable, in the case of heating with a heater, it dispels the cold air stagnant under the turntable, making it easier for hot air to enter, and circulating and stirring the hot air. can. Moreover, the fan shaft 21 is offset from the rotation axis 18, and the fan 20 is offset from the center in the lower space between the turntable 25 and the bottom plate 17, which causes wind pressure to be strong and weak around the lower space. The hot air tends to enter the lower space depending on the strength or weakness of the wind pressure, and the hot air is circulated and stirred significantly. Therefore, it is possible to improve uneven heating of the food even when the food is heated by microwaves or by a heater.

(f) Effect of the invention As explained above, the invention connects the fan shaft and the rotary shaft that rotates the turntable via a speed change means, and by rotating the rotary shaft, the stirrer fan can be rotated at the optimal rotation speed. Since it can be rotated, uneven heating can be eliminated. In addition, since the stirrer fan can be rotated using the driving force of the turntable, it is possible to provide a microwave oven that has a simple structure and provides optimal heating without the need for any other driving force. Furthermore, the stirrer fan has the function of stirring hot air, and its fan axis is offset from the rotation axis of the turntable, making it easy for hot air to enter between the turntable and the bottom plate of the cavity, thus preventing heating during hot air heating. Unevenness can also be significantly eliminated.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, and FIG. 2 is a schematic view showing an embodiment of the present invention. 10... Cavity, 6, 17... Cavity bottom plate, 1, 18... Rotating shaft, 19, 22... Bearing, 5, 20... Star rough fan, 2, 25...
Turntable, 28...Motive pulley, 29...
Driven pulley, 27, 30...belt.

Claims (1)

[Scope of utility model registration request] A turntable mounted on a rotary shaft rotatably supported on a bottom plate of a cavity, a stirrer fan disposed between the turntable and the bottom plate, and a hot air generating means, the stirrer fan A fan shaft is offset from the rotating shaft and rotatably supported on the bottom plate, and the fan shaft and the rotating shaft are connected via a speed change means, and the stirrer fan is rotated by rotation of the rotating shaft. A microwave oven characterized by: