JPS5852633Y2 - High frequency heating device - Google Patents

Description

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

Conventionally, this type of turntable-type high-frequency heating device
A motor is used as the driving force for rotation, which is decelerated by gears and a rotating shaft is brought into the heating chamber from outside the heating chamber and transmits mechanical force directly to the food table, and a magnet attached to the outside bottom of the heating chamber is rotated. There were some that were rotated by magnetic coupling with a magnet in the heating chamber.

The present invention relates to the latter magnetic drive method, and is intended to solve the problem of abnormal noise that occurs during mass production with a simple configuration.An example of the present invention is attached below in comparison with a conventional example. This will be explained with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a high-frequency heating device main body, and this high-frequency heating device main body 1 includes a heating chamber 2 for storing an object to be heated, and a high-frequency oscillator (see FIG. ) is built-in.

Further, reference numeral 4 denotes a door attached to the front opening of the heating chamber 2 so as to be openable and closable, and a door screen 5 and a handle 6 are attached to this door 4 for viewing the heating state of the object to be heated in the heating chamber 2. It is being

Further, reference numeral 7 denotes an operation panel disposed on the front surface of the high-frequency heating device main body 1, and this operation panel 7 is provided with knobs for controlling the high-frequency oscillator 3 and the like.

Further, reference numeral 8 denotes a food placement table, and this food placement table 8 is detachably and rotatably disposed on a circular squeeze portion 9 provided on the inner bottom surface of the heating chamber 2.

On the other hand, the high frequency oscillator 3 and a fan motor 11 for cooling the high frequency oscillator 3 are provided on the upper surface of the upper plate (FIG. 2 10) of the heating chamber 8, and a fan motor 11 for cooling the high frequency oscillator 3 is installed to introduce the cooled air into the heating chamber 2. An air guide 12, a high voltage transformer 13 that supplies DC high voltage to the high frequency oscillator 3, and a high voltage capacitor 1.
4th class is arranged.

Further, as shown in FIG. 2, on the side of the heating chamber 8 there is a door arm 15 of the door 4, a roller 16 for sliding the door arm 15 back and forth, and a mounting plate 17 to which the roller 16 is attached. , a spring 19 hung on the main body bottom plate 18 and the door arm 15, and a door switch 20 that opens and closes by sliding the door arm 15 back and forth.

Further, the bottom plate (FIG. 3, 21) of the heating chamber 8 is formed of a non-magnetic metal plate, and the circular constriction portion 9 is provided on the bottom plate 21 as shown in FIG.

The food placing table 8 is rotatably supported by a plurality of rollers 22 on the inner bottom surface, that is, the upper surface of the squeeze portion 9, and furthermore, a glass tray 23 is placed on the food placing table 8.

On the other hand, a first rotating body 24 made up of a pulley is disposed on the outer bottom surface, that is, the lower surface of the squeeze portion 9, and when the first rotating body 24 rotates, the food placing table 8 becomes a permanent magnet, which will be described later. It is designed to be rotationally driven by magnetic coupling means.

Note that a second rotating body 25 composed of a pulley is disposed on the side of the first rotating body 24, and these are connected to a belt 26.
are connected by.

On the other hand, a pulley 27 is attached to the shaft of the fan motor 11 disposed on the upper surface of the upper plate 10 of the heating chamber 8, and a worm gear 28 is attached to the pulley 27 and the worm gear 28 disposed on the upper surface of the upper plate 10.
The pulley 30 attached to the worm shaft 29 of the belt 3
They are connected by 1.

Further, the upper end of the wheel shaft 29 a of the worm gear 28 is pivotally supported by the upper body case 30 a, and the wheel shaft 29 a
The lower end of the lower body 9a passes through the lower main body case 31a with some play and is pivotally supported by a bearing 32, and the second rotating body 25 is mounted in the middle thereof.

Therefore, when the fan motor 11 is driven, the high frequency oscillator 3 is cooled, and at the same time, the worm gear 28
, the second rotating body 25, and the belt 26, the first rotating body 24 is rotationally driven, and as a result, the food placing table 8 is rotationally driven by the magnetic coupling means as described above.

Next, the first rotating body 24 will be described.

As shown in FIG. 5, a pulley groove 33 is provided on the peripheral edge of the first rotary body 24 shown in FIG. 4, and the first rotating body 24 is rotationally driven by a belt 26.

In addition, three magnet holes 34 are provided concentrically in the first rotating body 24, and the shape of the magnet holes 34 is limited to one corner so as not to misalign the magnetic pole direction of the permanent magnet 35 inserted therein. It has a different shape from the other corners.

Furthermore, the permanent magnet 35 is formed in the same shape as the magnet hole 34, and after being inserted into the magnet hole 34, the permanent magnet 35 is
5 is covered with a magnet cover 36 shown in FIG.
The elastic retaining pieces 36a provided on all sides of the magnet cover 36 are pushed into the back surface through the four holes 37 shown in FIG.
6 a is engaged with the back surface of the first rotating body 24 .

As a result, the permanent magnet 35 is reliably housed inside the magnet hole 34 and does not wobble.

Furthermore, roller mounting holes 38 are provided concentrically on the sides of each magnet hole 34 as shown in FIG. 4, and a roller 39 shown in FIG. 5 is mounted in this roller mounting hole 38.
The installation method is as follows.

That is, a roller shaft 41 that is thinner than the center hole 40 of the roller is inserted into the roller 39 as shown in FIG. 5, and roller shaft holding parts 42 as shown in FIG. Therefore, when the roller shaft 41 is pushed into the roller shaft holding portion 42 as shown in FIG. 7, the roller 39 is attached to the roller attachment hole 36.

In addition, three or more rollers 39 are installed near the magnet attachment part so that they rotate in contact with the outer bottom surface of the heating chamber 2.
Therefore, even if the first rotating body 24 or the bottom plate 21 of the heating chamber 2 is slightly deformed, the magnet cover 36 will not rub against the outer bottom surface of the heating chamber 2, and the first rotating body 24 will always rotate smoothly. That's what I do.

Conventionally, in this type of magnetic drive type high frequency heating device, the bottom wall 9 of the heating chamber is made of a non-magnetic material such as stainless steel SUS 304 through which magnetic flux passes, while the roller shaft 41 is made of a non-magnetic material such as stainless steel SUS 304, which is made of stainless steel that passes through magnetic flux. The first rotating body 24 and roller 39 are made of synthetic resin such as polyacetal, which has good abrasion resistance and low contact resistance because each part has uneven sliding parts. was using.

In the above conventional configuration, the roller mounting hole 38 and the magnet hole 34
Even if the gap between the magnets is reduced in order to increase the magnetic transmission torque, the magnet cover 36 is formed close to the outside bottom wall of the heating chamber so that it does not come into contact with it, so the powder of the magnet 35 is , enters the gap between the roller shaft 41 and the roller 39, and the rotation of the roller 39 becomes discontinuous, or worse, the rotation of the roller 39 stops.As a result, the bottom wall 9 of the heating chamber resonates, causing abnormal noise. This has disadvantages in that the rotational torque required to rotate the food table 8 increases.

This phenomenon occurs when the roller shaft 41 is made of steel or stainless steel.
Since a magnetic material was used like S430, powder from the magnet 35 that was far away was likely to adhere to it.

In order to eliminate the above-mentioned drawbacks, the present invention uses a non-magnetic material such as stainless steel SUS 304 or aluminum rod, which does not attract magnetic powder, for the roller shaft 41.
1. It is designed to avoid adhesion of magnet powder.

Although the amount of magnet powder is small when handling the magnet, it scatters and adheres to nearby magnetic materials, making it impossible to completely eliminate it.

In addition, as shown in FIG. 8, there are fixing screws 43 between the heating chamber 2 and the main body bottom plate 18, or mounting screws 4 between the bottom cover for repair and inspection.
If you use a self-tapping screw for 5 etc., metal chips will be generated when screwing, and these metal chips will be used for iron plates, stainless steel, SUS, etc.
If the metal chips are made of a magnetic material such as 430, when they are scattered near the magnet 35, the metal chips are magnetized by the leakage magnetic flux and adhere to the nearby magnetic material.

Therefore, if the roller shaft 41 is made of magnetic material as in the past, since the roller shaft 41 is located near the magnet 35, the roller shaft 41
The adhering metal chips entered between the roller 39 and the roller shaft 41, causing abnormal noise or rotation stoppage in the same way as magnet powder.

As a result, in the conventional method, it was not possible to use a self-tapping screw, but by making the roller shaft 41 of a non-magnetic material as in the present invention, a self-tapping screw can be used, and workability is greatly improved.

In addition, in FIG. 8, 46 is the rotation axis of the rotating body 24, and 47
is a permanent magnet serving as means for magnetically coupling to the driving magnet 35 provided on the food table 8.

As is clear from the above description, in the present invention, the roller that rotates in contact with the outer bottom wall of the heating chamber provided on the rotating body is supported by a shaft made of a non-magnetic material, so that magnetic powder is generated between the roller and the roller shaft. The rollers rotate smoothly, and the bottom wall of the heating chamber does not resonate due to discontinuous rotation, so there is no discomfort during use.

In addition, when large powder gets between the roller and the roller shaft, the roller stops rotating, and the rotational torque required to rotate the food table increases. However, with the present invention, this problem is eliminated.

Furthermore, it becomes possible to use self-tapping screws, which improves work efficiency and has great practical value.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an embodiment of the high-frequency heating device of the present invention, Fig. 2 is a perspective view of the device with the main body removed, and Fig. 3 is the main part of the food platform drive section. FIG. 4 is a plan view of the rotating body, FIG. 5 is a sectional view taken along line BB' in FIG. 4, FIG. 6 is an enlarged sectional view of the magnet attachment part of the rotating body, and FIG. The figure is an enlarged sectional view of the roller attachment part, and FIG. 8 is a sectional view of the turntable part. 2... Heating chamber, 8... Food mounting table, 1
1...Motor, 24...Rotating body, 35
...... Drive magnet, 39... Roller, 4
1...Roller shaft, 47...Permanent magnet.

Claims (1)

[Scope of utility model registration request] A food mounting table rotatably installed on the bottom surface of the heating chamber, a rotating body connected to a motor that rotationally drives the food mounting table located on the outside bottom side of the heating chamber, a driving magnet provided on this rotating body, and the food and a means for magnetically coupling to the driving magnet provided on the mounting table, the rotating body is provided with a roller that rotates in contact with the outer bottom wall of the heating chamber, and this roller is supported by a shaft made of a non-magnetic material. Features of high-frequency heating equipment.