JPH0325223A - High frequency heating 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 Field of Industrial Application The present invention relates to a high-frequency heating device, and particularly to a so-called turntable mechanism on which an object to be heated is placed and rotated. 2. Description of the Related Art High-frequency heating devices such as microwave ovens are known to have a rotating plate inside the heating chamber in order to efficiently and uniformly heat the object to be heated. FIG. 3 shows a rotating plate drive mechanism of a conventional high-frequency heating device, in which a motor 2 is provided at the bottom of a heating chamber 1, and a rotating shaft 3 is engaged with the shaft of the motor 2. The center of the roller mounting rotary table 4 is engaged with the rotating shaft 3, and a plurality of rollers 6 are rotatably fixed to the outer periphery of the roller mounting rotary table 4 by roller mounting rings 5. ．． rotating plate 7
is on top of roller 6.

Therefore, the rotational force of the motor 2 is transmitted through the rotating shaft 3 to the roller mounting rotary table 4, and as the roller mounting rotary table 4 rotates, the roller '6 moves around the bottom surface of the heating chamber 1. The rotation is transmitted to the rotating plate 7. Problems to be Solved by the Invention Regarding the advantages of the rotating plate drive mechanism having such a configuration, for example, as shown in Japanese Patent Laid-Open No. 60-225398, the heating chamber can be easily cleaned, and the rotating plate drive mechanism has the following advantages: Ease of attachment and detachment is mentioned. It is also clearly shown that with such a structure, the rotating plate rotates at twice the rotation speed of the motor. For example, if the rotating plate is rotated at 6 rpm, the motor will rotate at 3 rpm.
This means that it is rotating. When the rotary plate and motor are directly connected, the rotation speed is 6 rpm for both motors, but when comparing the two motors, in order to obtain the same load torque for the rotating plate, the former motor requires half the rotational torque by the rotating plate drive mechanism. 6r of the latter method.
It is clear that it must generate twice the torque of a pm motor. Therefore, twice the force will be applied to each gear inside the motor, and if the gears were made of the same material and shape as the gears of a 6 rpm motor, the gears would break, so gears should be made of a stronger material to increase strength. i+uit requires a different shape and increases material costs
was there. The present invention solves these conventional illumination problems, and uses a simple structure to ensure ease of cleaning inside the oven and ease of attaching and detaching the rotary plate, while reducing material costs. The aim is to provide a high-frequency heating device that can reduce the amount of energy used. Means for Solving the Problems The high-frequency heating device of the present invention includes a plurality of rollers coaxially having two rotation radii, most of the rotation radius of the rollers rotates on the bottom surface of the heating chamber, and the rotation plate The structure is such that the roller rotates on the small rotation radius part of the roller. Effect Due to the above horizontal precept, the rotating plate rotates on the small rotation radius of the roller, so the rotating plate rotates at almost the same speed as the motor, and there is almost no torque reduction due to the rotating plate drive mechanism, so the load on the motor gear is reduced. This also reduces gear material costs. EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2. Components that are the same as the conventional example are given the same reference numerals and explained. A motor 2 is provided at the bottom of the heating chamber l.
A rotating shaft 3 is engaged with the shaft portion of the rotary shaft 3. The center of the roller mounting rotary table 4 is engaged with the rotating shaft 3, and a roller 6 having two rotation radii is mounted on the same axis by a roller mounting ring 5 on the outer circumference of the roller mounting rotary table 4. Multiple pieces are fixed and rotatable. The rotating plate 7 is a roller 6
It rests on the small turning radius portion 6b of the. Therefore, the rotational force of the motor 2 is transmitted through the rotating shaft 3 to the roller mounting rotary table 4, and as the roller mounting rotary table 4 rotates, the rotational radius of the roller 6 is mostly moved into the heating chamber. The rotational force is transferred to the rotary plate 7 which is in contact with the small rotation radius portion 6b of the roller 6, and is rotated at the rotation speed of the motor 2 (r. +r
m)/ra times (r1... Radius of most of the turning radius + rb...
・Rotates with rotation radius (radius of small part). For example, motor 2
The rotation speed of the roller 6 is 6 rpm, the radius r of the large rotation radius portion 6a of the roller 6 is 10−, and the radius r of the small rotation radius portion 6b is l■
If this is the case, the rotation speed of the rotating plate 7 is 6.6 rpm, and the rotating plate 7 rotates at 1.1 times the motor 20 rotation speed. Since rotation speed and torque are inversely proportional, the torque reduction rate due to this rotary plate drive mechanism is only 10%. Therefore, compared to a motor with a rotating plate drive mechanism that does not reduce torque (such as a motor and rotating plate directly connected), when considering the same load torque, the required generated torque of motor 2 is only 1.1 times. This is a significant improvement compared to the conventional motor, which requires twice as much torque to generate, and there is no need to increase the strength of the internal gears of the motor 2, thereby preventing an increase in material costs.

Effects of the Invention As described above, the high-frequency heating device of the present invention includes a plurality of rollers coaxially having two rotation radii, and most of the rotation radius of the rollers rotates on the bottom surface of the heating chamber, and the rotation plate is the horizontal axis rotating on the small rotation radius of the roller, so 1
By minimizing the torque reduction caused by the rotating plate drive mechanism and minimizing the torque generated by the motor without sacrificing the advantages of a similar rotating plate drive mechanism equipped with rollers with only one rotation radius, Minimizes the force applied to the gears inside the motor, and uses the best material for gears. This provides a low-cost high-frequency heating device that suppresses the increase in material costs due to its shape, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a high-frequency heating device showing an embodiment of the present invention, FIG. 2 is a perspective view of the same roller, and FIG. 3 is a sectional view of a main part of a conventional high-frequency heating device. 6...roller, 7...rotating plate.

Claims (1)

[Claims] A heating chamber that stores and heats an object to be heated, a rotating plate that rotates while placing the object to be heated, and a roller mounting ring that is detachably interposed between the bottom of the heating chamber and the rotating plate. a plurality of rollers that are rotatably supported by the roller mounting ring and have two rotation radii on the same axis; a motor that rotates the roller mounting ring; and a motor that rotates the roller mounting ring; A high-frequency heating device comprising a rotating shaft for transmitting information to a ring, wherein a large portion of the rotational radius of the roller rotates on the bottom surface of the heating chamber, and the rotating plate rotates on a small portion of the rotational radius of the roller.