JPS5829911Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a so-called turntable-type high-frequency heating device in which a food table is rotatably installed in a heating chamber.

Conventional structure and problems Conventionally, this type of turntable-type high-frequency heating device uses a motor as the rotational driving force, decelerates it with gears, brings the rotating shaft into the heating chamber from outside the heating chamber, and places it on the food table. There are those that directly transmit mechanical force, and those that rotate a magnet attached to the outside bottom of the heating chamber and are rotated by magnetic coupling with the magnet inside the heating chamber.

However, the latter has various problems in obtaining the necessary rotational torque, and its practical application has been delayed.

Purpose of the invention The purpose of the invention is to minimize the variation in magnetic coupling force during manufacturing, downsize the magnet, and economically obtain smooth rotational drive of the food table.

Structure of the Invention In order to achieve the above-mentioned object, the present invention has a food placing stand rotatably provided inside the heating chamber, and a rotating device connected to a motor that rotationally drives the food placing stand provided on the outside bottom side of the heating chamber. a driving magnet provided on the rotating body, and means for magnetically coupling to the driving magnet provided on the food mounting table, the rotating body sliding in contact with the outer bottom surface of the heating chamber. It is equipped with a synthetic resin type sliding piece.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a high-frequency heating device main body, 2 is a heating chamber provided in the main body 1, and at least the bottom plate portion is made of a non-magnetic metal material.

3 is a door that covers the front opening of the heating chamber 2 so as to be openable and closable, and 4 is a magnetron that supplies high frequency energy into the heating chamber 2, and is installed on the upper surface of the heating chamber 2.

5 is a rotatable stirrer blade to reduce uneven heating in the heating chamber; 6 is a partition plate that partitions the heating section and the stirrer blade mounting portion; 7 is a food plate rotatably installed at the inner bottom of the heating chamber 2; On the lower surface of the stand, a permanent magnet 9 supported by a holder 8 made of non-magnetic metal is provided on the circumference, and a roller 10 is rotatably provided.

11 is a saucer containing food 12; 13 is a rotating body that also serves as a synthetic resin pulley rotatably mounted on a shaft 14 fixed at the center of the outside bottom of the heating chamber; It is equipped with a magnet 15 and is integrally formed with a sliding piece 16 that comes into contact with the outside of the heating chamber.

17 is a pulley 18. This is a motor that rotates the rotating body 13 via a belt 19.

In the above configuration, the magnet 9 provided on the food table 7 and the magnet 15 provided on the rotating body 13 have different facing poles so as to attract each other, and the rotating body 1 having the driving magnet 15
3 rotates, the food mounting table 7 having the permanent magnet 9 rotates following this rotation.

The weight of the food 12 placed on the food mounting table 7 is generally about 4 kg at maximum, and the required rotational torque at this time is about 3 kg cm, as shown in FIG.

Further, as shown in FIG. 3, the relationship between the transmitted torque and the gap between the magnets is such that the smaller the gap, the greater the transmitted torque, but as the gap becomes larger, the transmitted torque becomes extremely small.

Therefore, if the variation in the gap increases, it is necessary to install a large, high-performance magnet that can obtain the transmission torque necessary for rotation even for the largest gap.

The present invention aims to reduce the above-mentioned gap and economically obtain smooth rotational drive, and as shown in Figs. 4 and 5, a magnet mounting hole 20 is provided in the rotating body 13, and a magnet 15 is inserted into this mounting hole. At the rear, the foot portion 22 of the synthetic resin type cover 21
is inserted into a groove 23 provided around the mounting hole 20 and fixed.

In step 22, the hook part 24 having elasticity is attached to the foot part 22. After the hook part 24 is inserted into the groove, it returns to its original position elastically as shown in FIG. 6, and the cover 21 does not come off.

The magnet is provided with R25 that is symmetrical with respect to the center line of the magnet, and the mounting hole 20 is also provided with R26 that corresponds to the magnet, so the NS pole of the magnet will not be incorrectly installed and will be stable. Quality can be maintained with easy work.

In order to make such grooves and mounting holes, it is best to make the rotating body 13 from synthetic resin, and it is possible to make the multiple mounting holes uniformly on the same surface, and it is also possible to make them integrally formed on the rotating body 13. Since the sliding piece 16 is provided in the vicinity of the magnet mounting hole 20, the distance l between the magnet 15 and the bottom wall 2 of the heating chamber can be made extremely small, and variations during manufacturing can also be made very small.

The magnets 15 are installed with some play in the mounting holes 20 of the rotating body, but when the permanent magnets 9 are installed, they attract each other, so the driving magnets 15 move to the closest position within the range of the play. , the gap becomes smaller and maximum transmission torque can be obtained.

Furthermore, in FIGS. 5 and 6, a synthetic resin type cover 2 is shown.
Since the sliding portion 16 is integrally formed in the heating chamber bottom plate 2, the distance l between the magnet 15 and the heating chamber bottom plate 2 is equal to the thickness of the synthetic resin type cover 21, and can be set arbitrarily to a constant value by simply changing this thickness. You can get distance.

Therefore, the distance between the magnets can be minimized, and the magnets can be made smaller.

In addition, since three or more of the above-mentioned sliding parts are provided on the rotating body at approximately equal angles, the rotating body and the heating chamber do not come into contact with each other in places other than the sliding parts, and the heating chamber that comes into contact with the sliding part 16 does not The chamber side is made of a non-magnetic material such as stainless steel SUS 304 with a surface roughness of 5μ or less, so the contact resistance with the resin sliding parts is small and there is no contact due to rust etc. Smooth rotation can be achieved without having to worry about increased resistance.

Effects of the Invention As explained above, according to the present invention, the gap between the magnets can be made smaller, and the variation in the gap that occurs during manufacturing can also be minimized.As a result, it is possible to obtain the necessary rotational torque with a small magnet, and the work is easier. Good sex,
Moreover, an economical turntable can be provided.

Furthermore, since the synthetic resin type sliding piece is provided outside the heating chamber, it is not exposed to high frequency waves and is not deformed by heating.

Furthermore, since the sliding piece is only stressed by the attractive force between the magnets, the contact resistance is always constant and smooth rotation can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a high-frequency heating device equipped with a magnet-driven turntable showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the weight of the load placed on the food table and the required rotational torque. Fig. 3 is a diagram showing the relationship between the gap between magnets and the transmitted torque, Fig. 4 a, l) are a cross-sectional view and a plan view of the rotating body,
FIG. 5 is an exploded perspective view showing another embodiment of the drive magnet mounting portion, and FIG. 6 is a sectional view thereof. 2... Heating chamber, 4... Magnetron,
7... Food mounting table, 9... Permanent magnet,
13...Rotating body, 15...Driving magnet, 16...Sliding piece, 17...Motor.

Claims (6)

[Scope of utility model registration request] (1) A food mounting table rotatably provided on the bottom side of the heating chamber, a rotating body connected to a motor that rotationally drives the food placing table provided on the outside bottom side of the heating chamber, and a drive provided on this rotating body. and a means for magnetically coupling to the driving magnet provided on the food table, and the rotating body is provided with a synthetic resin-type sliding piece that slides in contact with the bottom surface outside the heating chamber. High frequency heating device. (2) The synthetic resin type sliding piece that contacts and slides on the outer bottom surface of the heating chamber is provided in three or more places.
The high-frequency heating device described in Section 1. (3) The synthetic resin-type sliding piece that contacts and slides on the outer bottom surface of the heating chamber is integrally provided with a synthetic resin-type cover that holds a driving magnet provided on the rotating body. The high frequency heating device according to item 1. (4) The synthetic resin type sliding piece that contacts and slides on the outer bottom surface of the heating chamber is formed integrally with the rotating body made of synthetic resin, and the high-frequency heating according to claim 1 of the utility model registration claim. Device. (5) The high-frequency heating device according to claim 1, wherein the bottom wall of the heating chamber on which the sliding piece contacts and slides is formed of a stainless steel material. (6) The high-frequency heating device according to claim 5, wherein the bottom wall of the heating chamber made of the stainless steel material has a surface roughness of 5 μm or less.