JPH0117119Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a high-frequency heating device, particularly a high-frequency heating device equipped with a so-called turntable that rotates the food to cook to eliminate uneven heating. The purpose of this project is to improve the rotation transmission mechanism that transmits the rotational driving force of the motor, improve the durability of the motor, and reduce abnormal noise that occurs when the motor rotates.

Conventionally, a rotation transmission mechanism that transmits the rotational driving force of a motor to a rotating mounting table of a high-frequency heating device equipped with a so-called turntable, which rotates a cooking device during cooking to eliminate uneven heating, is a means of a speed reduction mechanism. As a result, multiple methods such as gears and pulleys are used in combination, resulting in a complex structure that requires a large amount of space and is not economical.

Therefore, the present invention aims to improve the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described below.

In FIG. 1, 1 is a main body case, 2 is a time switch, 3 is a cooking start switch, 4 is a cooking lamp, 5 is a door, and 6 is a handle. Reference numeral 7 denotes a heating chamber formed within the main body case 1, and a rotary mounting table 9 in the form of a disc is disposed on the bottom plate 8 of the heating chamber 7.

In Fig. 2, the heating chamber 7 is located on the top surface of the outside of the heating chamber.
magnetron 10 that supplies high frequency energy to
is installed.

Also, a motor 1 that serves as a drive source for rotating the rotary mounting table 9 inside the heating chamber is provided at the rear of the outside of the heating chamber 7.
1 is arranged so that a motor shaft 12 is vertically oriented, and a pulley A13 for transmitting rotation is attached to the motor shaft 12.

Generally, the appropriate number of rotations of the rotary mounting table 9 in the heating chamber is several times to more than ten times. Therefore, the motor 11
As a method of decelerating the rotational drive of
Pulley B17 and pulley C pivotally supported by
18 and a pulley D20 which is pivotally supported by a rotary shaft 19 mounted on the bottom plate 8 of the heating chamber, through belts 26, 27, and 28.

Note that the pulley B17 and pulley C18 are arranged in two stages to make it more compact.

Incidentally, the rotary mounting table 9 has a plurality of rollers 21 and magnets 22 arranged in a circumferential manner at the lower part of its periphery, and is rotatably mounted on the bottom plate 8 by the rollers 21. In addition, a plurality of magnets 23 and rollers 24 are arranged in a circumferential manner on the part of the pulley D20 that faces the magnet 22 of the rotary mounting table 9, and an attractive force acts between these magnets. There is. When the pulley D20 rotates, the rotating mounting table 9 is driven to rotate by its magnetic coupling means.

Reference numeral 25 denotes a bearing stand, which is a feature of the present invention, and is arranged on the fixture 14 of the motor 11 so as to support the tip of the rounded motor shaft 12.

In the above configuration, if the motor 11 is driven,
Pulley A12 and pulley B1 which are rotation transmission devices
7. Pulley C18, belt A26, belt B2
7. The pulley D20 is rotated at a reduced speed via the belt C28, and as a result, the rotary mounting table 9 is smoothly rotated by the magnetic coupling means of the magnets 22 and 23.

In FIG. 3, the motor 7 generally includes a fixed iron core 29, a motor shaft 12, a rotor 30 mounted on the motor shaft 12, bearings 31, 32, fixed windings (not shown), and a bearing stand 25. By arranging the rotor 30, the bearing stand 25 receives the weight of the rotor 30, and the weight of the rotor 30 is not applied to the bearing 32. As a result, the durability of the bearing 32 is improved. Further, the spacers 33 and 34 attached to the rotor 30 are attached to the rotor so as to provide a gap with the bearings 31 and 32, and the spacer 33 and the bearing 32 are brought into contact with each other at their surfaces due to the weight of the rotor 30, which is the bearing stand. 25
By arranging this, this surface contact is eliminated, and instead, since the tip of the motor shaft 12 is rounded, this rounded portion and the bearing stand 25 come into contact at a point. Therefore, since the contact area is reduced, the required starting torque at the time of starting the rotation is reduced, and as a result, the motor can be made smaller.

Furthermore, since the material of the motor shaft 12 is metal,
When the material of the bearing stand 25 is metal, the metals come into point contact with each other, and when the motor shaft 12 rotates, a metallic sound is generated at the contact portion. On the other hand, since the bearing stand 25 is made of a resin molded product, the contact parts are made of metal and resin, making it possible to reduce abnormal noises and other noises generated in the rotating parts, resulting in improved quality.

As explained above, by transmitting the rotation of the turntable drive motor using an inexpensive pulley and belt, it is highly economical. In addition, since a two-stage pulley is used, the reduction ratio can be easily achieved even if the reduction ratio is large, and it can be made more compact. Furthermore, by supporting the vertical motor shaft with a bearing stand, the weight of the rotor is not applied to the motor bearing, thereby increasing the durability of the bearing. Moreover, since the bearing stand is made of a resin molded product, abnormal noise generated during rotation can be reduced, and as a result, a high-quality, economical high-frequency heating device can be provided.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a high-frequency heating device showing an embodiment of the present invention, FIG. 2 is a sectional view showing the internal structure of the device, and FIG. 3 is an enlarged sectional view of a turntable driving motor. 12...Motor shaft, 25...Bearing stand, 26,2
7, 28... Belt, 29... Iron core, 30... Rotor, 31, 32... Bearing, 33, 34... Spacer.

Claims (1)

[Scope of utility model registration request] A freely rotatable rotating body equipped with a magnetic coupling means is provided near the outside bottom of the heating chamber, a rotary mounting table magnetically driven by the magnetic coupling means is provided on the bottom side of the heating chamber, and the rotating body is arranged in a plurality of two stages. A high-frequency heating device driven by a motor whose shaft is positioned substantially vertically via a pulley and a belt, and provided with a bearing stand made of a resin molded product to support the tip of the motor shaft.