KR870004168Y1 - High frequency heating apparatus - Google Patents

Abstract

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Description

High frequency heater

1 to 6 as showing an embodiment of the present invention

1 is a longitudinal cross-sectional view of the entire microwave oven.

2 is a longitudinal sectional view showing a rotational drive gear.

3 is a perspective view of the roller holder.

4 is a perspective view showing the engaging plate and the rotating shaft.

5 is a plan view of the cam.

6 is a schematic diagram for explaining the operation.

7 to 9 show another embodiment as

7 is a sectional view showing the rotational driving mechanism.

8 is a perspective view showing the attachment state of the guide member.

9 is a perspective view of the engaging plate and the rotating shaft with a guide member.

10 and 11 are perspective views each showing another embodiment.

12 to 14 are longitudinal cross-sectional views each showing a conventional rotary dish driving mechanism.

Fig. 15 is a perspective view of the roller holder of Fig. 14;

* Explanation of symbols for main parts of the drawings

22: oven 25: motor (rotary drive mechanism)

27: rotating plate 28: roller holder

28a: fitting portion 30: fitting plate

31: perforated hole 32: locking part

33: engaging groove 34: divided pieces

35: space 37: roller

The present invention relates to a high frequency heating device having a rotating plate for placing a heated object in an oven.

BACKGROUND ART In a high frequency heating apparatus such as a microwave oven, it is known that a rotating plate is provided in an oven in order to efficiently and uniformly heat a heated object.

Fig. 12 shows a rotating plate driving mechanism of a conventional microwave oven, where 1 is an oven and 2 is a rotating plate.

The motor 3 which comprises a drive mechanism is provided in the bottom of the oven 1, and the transmission shaft 5 is provided in this rotating shaft 4. In addition, the roller support plate on the bottom surface of the oven (1) described above

A plurality of rollers 7 supported by (6) are provided to support the above-described rotating plate 2 so as to be free to rotate.

The rotary plate 2 is provided with an engaging portion 8 that engages with the transmission shaft 5 described above so that the rotation plate 2 is rotated by the rotational force of the transmission shaft 5. However, since the roller support plate 6 is screwed to the bottom surface of the oven 1 as described above, the roller support plate 6 cannot be removed.

Therefore, when the inside of the oven 1 is cleaned, the roller support plate 6 becomes obstructed and cannot be cleaned to every corner.

Therefore, it is easy to catch food broth and garbage around the roller support plate 6 mentioned above, and is unsanitary. Therefore, as shown in FIG. 13, the rotating plate 9 is engaged with and installed on the rotating shaft 4, and the rotating plate 2 may be mounted on the upper surface of this rotating plate 9. As shown in FIG.

This has no protruding parts such as the roller support plate 6 on the bottom surface of the oven 1, and the rotating plate 2 can also be attached and detached freely, thereby greatly improving the cleaning efficiency. However, in the case of FIG. 13, since the weight of the heated object is supported only by the rotary shaft 4 of the motor 3, the bearings 10 and 11 supporting the rotary shaft 4 need to be firmly obtained. It can cause a price increase.

In addition, in order to be able to freely attach and detach the rotating plate 9, it is necessary to leave a gap in the engaging portion 12 of the rotating plate 9 which is engaged with the rotating shaft 4, and the object to be heated is the edge of the rotating plate 2 When placed on the plate, the rotating plate 2 may be inclined by the above-mentioned gap and may be in contact with the centrifugal force when rotating, and the heated object may come into contact with the wall of the oven during rotation, and the bearings 10 and 11 may The drawback is that partial wear occurs.

In addition, in the case of FIG. 13 described above, since the rotating plate 2 and the rotating plate 9 rotate at the same rotation speed, the electric field in the oven 1 does not change so much with food, and the absorption characteristics of radio waves to the food. It is also not good and the heating efficiency is bad.

In addition, there is a drawback that the food is not heated evenly, so that delicious cooking can not be made.

In addition, as shown in FIGS. 14 and 15, a roller holder 13 having a plurality of rollers 12 bearing between the bottom surface of the oven 1 and the rotary plate 2 is fitted. It is also known.

This is such that the rotation of the rotating shaft 4 of the motor 3 is transmitted to the rotating plate 2 supported by the roller 12 via the transmission shaft 5.

Therefore, the rotating plate 2 and the roller holder 13 can be attached and detached freely, the cleaning efficiency is good, and the drive mechanism of the rotating plate 2 is also structurally simple. However, each of the above-described rollers 12 only rotates between the bottom surfaces of the oven 1 in accordance with the rotation of the rotary plate 2.

For this reason, when food waste is accumulated on the bottom of the oven 1 and solidified, or when dust is attached, the rotational driving force of the roller 12 described above is weak, so that rotation is supported by the solids or dust and stopped. There is this.

When the roller 12 stops, the rotating plate 2 rotates while slipping on the roller 12, but if this condition continues, the motor 3 becomes overloaded and the motor 3 The rotation of it may stop.

Therefore, it is necessary to frequently clean the bottom surface of the oven 1 to remove deposits such as solid matter and dust.

14 and 15, the roller holder 13 is about one half of the rotation speed of the rotating plate 2, and the shape is a ring shape. Moreover, it consists of dielectrics, such as resin.

Therefore, there is a drawback that there is no diffusion and agitation of radio waves, poor heating efficiency, and the food is not uniformly heated.

Moreover, when the rotating plate 2 rotates, the roller holder 13 also rotates accordingly. However, the regulation of the deviation of the rotation of the roller holder 13 is caused by a ring-shaped spring formed on the rotating plate 2. It is the recessed part 1a formed in the bottom part 2a and the bottom of the oven 1.

In this case, when the roller holder 13 is displaced from the center of rotation, the roller holder 13 tries to return the position of the roller holder 13 itself to the center of rotation by contacting the protruding portion 2a or the concave portion 1a. The force is applied but far from the center of rotation, that is, the portion of the roller 12 has a weak t orque, so that the torque of the rotating plate 2 due to the contact is weakened, and the normal rotation cannot be performed or protrudes. When food waste or dust is attached to the place 2a and the concave place 1a, the torque is weak, so that the rotation of the roller holder 13 is disturbed, and the rotating plate 2 does not rotate.

In addition, when the food is placed on the rotating plate (2) and placed on the roller holder (13), the positioning is protruded (2a) and the engaging portion of the shear shaft (5), there is a defect that is difficult to fit have.

Moreover, the reduction mechanism is provided in the rotating shaft 4 through the gears 14 and 15 in the rotation drive mechanism of each conventional example mentioned above, and the cam 16 is formed in the gear 15. As shown in FIG. In some cases, the cam 16 is turned on and off by the cam 16, and the high frequency output is lowered to perform thawing or boiling.

In general, however, the rotation speed of the rotary dish 2 of the microwave oven is obtained by improving the efficiency of the rate of application and reducing the uneven heating, and about 6-8 rpm (7.5-10 s / 1 revolution) is common.

On the other hand, the weak output corresponds to about 50-40% of the top normal output, and the cam 16 reduces the rotation speed of the gear 15 by about half (about 3-4 rpm, 15-20 seconds / 1 revolution). Is rotated to turn the micro switch 17 ON and OFF.

When the cam surface is formed so that the output is about 50% as usual, the ON time of the micro switch 17 is 7.5-10 seconds and the OFF time is 7.5-10 seconds. By repeating this, the output can be lowered.

In addition, if the cam surface 16 is directly installed on the rotary shaft 4, the cycle time is 7.5-10 seconds, and the ON time of the weak output is about 3.8-5 seconds, and the time for which the high frequency is radiated is too short. In addition, the number of times of turning ON and OFF of the micro switch 16 is also doubled and the service life is reduced.

Therefore, reduction mechanisms such as the gears 14 and 15 are required, which makes the structure complicated and causes a price increase.

The present invention has been made in view of the above-described circumstances, and its object is to improve the cleaning efficiency in the oven, and to provide a simple structure and easy to attach and rotate a rotating plate, and to further improve heating efficiency and heating. It is possible to reduce non-uniformity and further lower the price, and to provide a high frequency heating device that can prevent abnormal heating near the rotation center.

The present invention is equipped with a roller holder that rotates by the rotary drive mechanism between the bottom surface of the oven and the rotary plate in order to achieve the above object, and fitted to the roller holder to regulate the center of rotation of the rotary plate. The lower part of the roller holder is provided with a fitting portion, and a plurality of rollers for transmitting the rotational force to the above-mentioned rotary plate while driving the bottom surface of the oven to the roller holder, while covering the lower surface of the fitting portion described above. A pair of perforated holes are installed in a portion opposed to the lower surface opening of the above-described fitting portion, and a substantially linear locking portion is formed between these perforated holes, and the above-described rotary drive mechanism The engaging portion of the shape corresponding to the above-mentioned engaging portion of the engaging portion is formed on the rotating shaft of the Through the split members which fit above a hole drilled into a pair of roller holders for the above-mentioned axis of rotation in a state in which inserted into the space between the engagement part and the engagement plate of the roller holder fitted to a fitting portion to fit to walk on.

1 to 6 show one embodiment of the present invention.

In FIG. 1, 21 is powder of a high frequency heating apparatus, and 22 is oven.

An opening (perforated hole) 23 is provided at the bottom of the oven 22, and an attachment plate 24 is provided at a lower portion facing the opening 23.

A motor 25 constituting the rotary drive mechanism is attached to the attachment plate 24, and the rotary shaft 26 penetrates through the opening 23 described above and protrudes into the bottom of the oven 22.

On the other hand 27 is a rotary plate on which the heated object is placed, and the roller holder 28 is attached between the rotary plate 27 and the bottom surface of the oven 22 so as to be freely attached and detached.

As shown in FIGS. 2 and 3, the roller holder 28 has a disk shape made of metal or the like that easily reflects radio waves. A flange 29 is provided at the outer circumferential edge thereof.

Moreover, in the center of the upper surface of this roller holder 28, the fitting part 28a is provided in the shape of the protruding round boss shape, and this fitting part 28a is the center part of the lower surface of the rotary dish 27. It is formed to fit in the recessed part 27a.

In addition, the engaging plate 30 shown in FIG. 4 is attached to the lower center part of the roller holder 28 in the state which covered the lower opening part of the fitting part 28a.

In the engaging plate 30, a pair of perforated holes 31 and 31 are formed at a portion of the fitting portion 28a facing the lower opening of the fitting portion 28a, and at the same time, the perforated holes 31 and 31 of the fitting plate 30 are formed. ), A substantially straight locking portion 32 is formed.

Further, at the upper end of the rotating shaft 26 of the motor 25, a engaging groove 33 having a shape corresponding to the engaging portion 32 of the engaging plate 30 is formed.

Then, the pair of divided pieces 34 and 34 of the engaging groove 33 are roller holders 28 through the perforated holes 31 and 31 of the engaging plate 30. The fitting portion 28a of the rotary shaft 26 and the roller holder 28 is engaged in a state of being inserted into the space 35 between the fitting plate 28a and the fitting plate 30. .

In addition, the four roller shafts 36 protrude from the flange 29 of the roller holder 28 at equal intervals, and the roller 37 is freely rotated on these roller shafts 36. .

Accordingly, the roller 37 supported by the roller holder 28 is mounted between the bottom surface of the oven 22 and the lower surface of the rotary plate 27 and is rotated by the rotating roller holder 28. Therefore, the roller 37 vibrates the bottom surface of the oven 22, and the rotation is transmitted to the rotating plate 27. As shown in FIG.

In addition, the roller contact surfaces 38 and 39 of the bottom surface of the oven 22 and the lower surface of the rotary plate 27 which are in contact with the roller 37 described above are formed in the ring raceways 40 and 41. have.

Moreover, as shown in FIG. 5, the cam 42 is fitted to the rotating shaft 26 of the motor 25 mentioned above, and the micro switch 43 is contacting this cam surface.

In addition, “44” is a magnetron and “45” is a waveguide.

Next, the operation of the above-described embodiment will be described.

First, when the electric motor 25 is energized, the rotating shaft 26 rotates at a required rotational speed (for example, 3 rpm), and this rotation is transmitted to the roller holder 28 through the engaging plate 30. do. When the roller holder 28 rotates, the roller 37 drives the bottom surface of the oven 22 by this rotational force.

When the roller 37 is driven, the rotational force is transmitted to the rotating plate 27 connected to the roller 37, and twice the rotation speed of the roller 28 in the same direction as the roller holder 28 (6 rpm). Rotate to

That is, as shown in FIG. 6, when the roller 37, which was originally in the A position, rotates halfway and proceeds as far as the distance a to the B position, the rotating plate 27 is rotated according to the rotation of the roller 37. The W position portion behind the position a is moved from the X position in contact with the roller 37 to the Y position.

Therefore, when the roller 37 rotates halfway, the roller holder 28 advances by almost a, and the rotating plate 27 moves 2xa from the W position to the Y position.

When the roller 37 is rotated once, the roller 37 proceeds as much as b in A-C, and the rotary plate 27 moves to the V-Z position and rotates at twice the number of revolutions in the same direction as the roller holder 28.

At this time, the cam 42 fitted to the rotating shaft 26 is rotated (3 rpm) by the rotation of the rotating shaft 26, and the micro switch 43 is turned on and off by the cam surface.

If the weak output is set to 50% of the normal output, the ON time is 10 seconds and the off time is 10 seconds (cycle 20 seconds).

At this time, the rotation of the rotary plate 27 gives the rotational driving force from the roller 37, but the center of rotation of the second rotation is regulated by the fitting portion 28a and the recess 27a, so that the torque is strong and normal rotation In addition, since the fitting portion 28a and the recess 27a are located below the rotary plate 27, food waste or dust is not attached, and thus smooth rotation is possible.

Therefore, in the above-mentioned matters, since the rotation speed of the roller holder 28 formed by the metal material which reflects a radio wave differs from the rotation speed of the rotating plate 27 formed from the material of glass, plastic, etc. which transmits a radio wave, The diffusion and agitation effects can be enhanced, and the microwaves reflected by the roller holder 28 can be uniformly irradiated on the whole food placed on the rotary dish 27.

Moreover, since the roller contact surfaces 38 and 39 of the bottom surface of the oven 22 which contact the roller 37 and the lower surface of the rotary dish 27 were formed in the ring track | orbit 40 and 41, food waste However, even if the dust is easy to remove, the cleaning efficiency is improved and can be expected normal rotation, and the weight of the food is easy to disperse to the front surface of the bottom of the oven 22, and does not deform well.

Therefore, it is possible to cook by heating in a stable transfer.

In addition, the roller (37) has a circular arc (outside) ), The roller contacts are almost in point contact with the roller contact surfaces 38 and 39, thereby reducing the possibility of contact with food residues and dust, thereby preventing vibration and abnormality of the rotary dish 27. have.

In addition, the engaging plate 30 is provided on the lower surface of the roller holder 28 in a state covering the lower opening of the fitting portion 28a, and the hole 31 which is perforated by the engaging plate 30, 31 and the engaging portion 32, and the engaging groove 33 of the shape corresponding to the engaging portion 32 of the engaging plate 30 to the rotary shaft 26 of the motor 25 is provided. The rotating shaft 26 and the roller arc are inserted by inserting the divided pieces 34 and 34 of both of the engaging grooves 33 into the perforated holes 31 and 31 of the engaging plate 30. The fitting portion 28a of the holder 28 is engaged with the rotary shaft 26 on the roller holder 28 side by a flat plate fitting plate 30 integrally. Since it can shape | mold, the price of manufacturing cost can be reduced.

In addition, a choke cham ber which forms a space 35 between the fitting portion 28a of the roller holder 28 and the engaging plate 30 to weaken radio waves by the space 35. Because of this, the spark, abnormal heating, and the like between the rotating shaft 26 and the engaging plate 30 of the roller holder 28 can be prevented.

In addition, this invention is not limited to the above-mentioned embodiment. For example, as shown in FIGS. 7 to 9, a ring-shaped guide member 51 for fitting the shaft 26 may be provided.

In this case, it is possible to prevent rattling between the rotary shaft 26 and the roller holder 28 when they are engaged with each other. Therefore, the rotary shaft 26 and the roller holder 28 can be kept in close contact with each other, so that they can be kept at approximately the same electric potential, and sparks and abnormal heating can be reliably prevented.

Since the roller holder 28 can be guided by the guide member 51 when the roller holder 28 is inserted into the rotary shaft 26, the roller holder 28 can be easily fitted.

As shown in FIG. 10, the roller holder 28 forms a plurality of roughly opening portions 52 around the engagement portion 28a, and each of the opening portions 52, 5 2 is formed. The arm-shaped radio wave agitator 53 may be formed between the four arms 61, and as shown in FIG. 11, the four arms 61 are formed in a cross shape around the engaging portion 28a. It may be arranged so that the roller 37 is supported by the front end of each arm 61.

In addition, of course, various modifications can be made without departing from the scope of the present invention.

As described above, according to the present invention, the driving force of the rotary drive mechanism is transmitted to the roller holder, and the rotary force is rotated on the bottom of the oven by rotating the roller on the bottom of the oven. Even if attached, the rollers have the effect of rolling over them and rotating smoothly.

Therefore, it is not necessary to clean the bottom of the oven frequently, there is an effect that the cleanliness is greatly improved.

In addition, since the fitting portion for regulating the center of rotation of the rotating plate is installed in the roller holder, it is possible to prevent the oscillation when the rotating plate rotates and at the same time, it is easy to position and determine.

In addition, the rotary plate is supported by a number of rollers of the roller holder, so that the rotating plate can be prevented from tilting and durability is also improved.

In addition, a pair of insertion holes are drilled and installed in a portion of the engaging plate attached to the lower surface of the roller holder with the lower surface of the engaging portion facing the lower opening of the fitting portion described above. A pair of divided pieces between the engagement grooves is formed between the engagement grooves, and a substantially linear engagement portion is formed therebetween, and an engagement groove of a shape corresponding to the above-described engagement portion of the engagement plate is formed on the rotation axis of the above-described rotary drive mechanism. The rotary shaft was fitted to the fitting portion of the roller holder while being inserted into the space between the fitting portion of the roller holder and the fitting plate through the above-described insertion hole, thereby reducing the cost of manufacturing. In addition to this, it is possible to prevent abnormal heating near the rotation center.

Claims (2)

A high frequency heating apparatus having a rotary plate for placing a heated object in an oven, comprising: a roller holder mounted so as to be freely attached and detached between the bottom surface of the oven and the rotary plate, and installed at the center of the holder. A boss-shaped fitting portion which protrudes toward the rotating plate and regulates the center of rotation of the rotating plate, and is attached to the lower surface of the above-described roller holder in a state covering the lower opening of the fitting portion, A hooking plate having a substantially linear locking portion formed between a pair of insertion holes provided in a portion opposed to the bottom opening of the fitting portion, and installed in the bottom portion of the above-described oven, and fitted into the fitting portion of the roller holder described above. An engaging groove of a shape corresponding to the engaging portion of the engaging plate described above is formed in the insertion portion to be inserted. The fitting portion of the above-mentioned roller holder in a state where the two pairs of split pieces are fitted into the space between the above-described roller holder through the above-described fitting hole and the above-mentioned engagement plate, And a rotary drive mechanism for applying the rotational force to the above-described roller holder, and rotating freely to the above-mentioned roller holder, thereby transferring the rotational force to the above-mentioned rotating plate while driving the bottom surface of the oven. A high frequency heating device comprising a roller. The high frequency heating device according to claim 1, wherein the engaging plate is provided with a ring-shaped guide member for fitting the rotary shaft of the rotary drive mechanism to the lower surface thereof.