JPS60225395A - High frequency heater - 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 [Technical Field of the Invention] This invention relates to a high-frequency heating device equipped with a rotating plate for heating objects in an oven.

[Technical background of the invention and its problems]

2. Description of the Related Art High-frequency heating devices such as microwave ovens are known to include a rotating plate inside the oven in order to efficiently and uniformly heat an object to be heated.

FIG. 1 shows a rotating plate drive mechanism of a conventional microwave oven, where 1 is an oven and 2 is a rotating plate. A motor 3 constituting a drive mechanism is provided at the bottom of the oven 1, and a transmission shaft 5 is provided on the rotating shaft 4. Furthermore, a plurality of rollers 7 are provided on the bottom surface of the oven 1, and are rotatably supported by the rotary plate 2.

This rotary plate 2 is provided with a retaining portion 8 that engages with the transmission shaft 5, so that the rotary 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 of the oven 1 as described above, the roller support plate 6 cannot be removed. Therefore, when cleaning the inside of the orb 1, the roller support plate 6 gets in the way and it is not possible to clean every corner. Therefore, food juices and dregs tend to accumulate around the roller support plate 6, which is unhygienic.

Therefore, as shown in FIG. 2, there is also a device in which a rotating plate 9 is engaged with the rotating shaft 4, and a rotating plate 2 is placed on the upper surface of the rotating plate 9. This is because there are no protruding parts such as the roller support plate 6 on the bottom of the oven 1, and the rotary plate 2 can be freely moved by 1 m, so cleaning efficiency is greatly improved.

However, in the case of FIG. 2, since the weight of the object to be heated is supported only by the rotating shaft 5 of the motor 4, the bearings 10 and 11 that support the rotating shaft 4 must be constructed robustly, which increases costs. Cause. In addition, in order to make the rotating plate 9 detachable, it is necessary to provide a gap in the engaging portion 12 of the rotating plate 9 that engages with the rotating shaft 4. , the rotary plate 2 is tilted by the amount of the gap, and together with the centrifugal force during rotation, the object to be heated may come into contact with the wall surface of the oven during rotation, and the bearings 10 and 11 may wear unevenly. be. In addition, in the case of FIG. 2 above,
Since the rotary plate 2 and the rotary plate 9 rotate at the same rotation speed, the electric field within the oven 1 does not change much with respect to the food, and the absorption characteristics of radio waves to the food are not good, and the heating efficiency is also poor. Also,
The drawback is that the food is heated unevenly, making it impossible to cook the food properly.

Furthermore, as shown in FIGS. 3 and 4, a roller holder 13 having a plurality of rollers 12 pivotally supported is interposed between the bottom of the oven 1 and the rotary plate 2. ing.

This is so that the rotation of a rotating shaft 4 of a motor 3 is transmitted via a transmission shaft 5 to a rotating plate 2 supported by rollers 12 . Therefore, the rotating plate 2 and the roller holder 1
3 is removable, easy to clean, and the drive mechanism for the rotary plate 2 is structurally simple.

However, each of the rollers 12 only rotates in conjunction with the rotation of the rotary plate 2 between the bottom surfaces of the oven 1. For this reason, if food crumbs accumulate and harden on the bottom of the oven 1, or if dust adheres to the bottom surface of the oven 1, the rotational driving force of the rollers 12 is weak, so the rotation is blocked by the solids and dust and the rollers 12 stop. Sometimes. When the roller 12 stops, the rotary plate 2 rotates while slipping on the roller 12, but if this state continues, the motor 3 may become overloaded and the rotation of the motor 3 may stop. Therefore, it is necessary to frequently perform W4I on the bottom surface of the oven 1 to remove deposits such as solid matter and dust. Also,
In the case of FIGS. 3 and 4 above, the roller holder 13 has a rotation speed of approximately 1/2 of the rotation speed of the rotary plate 2, but it has a ring shape and is made of a dielectric material such as resin. It is configured. Therefore, there is no diffusion or stirring effect of radio waves,
The disadvantage is that the heating efficiency is poor and the food may be heated unevenly.

Further, in the rotary drive mechanism of each of the conventional examples, a reduction mechanism is provided on the rotary shaft 4 via a gear 14, 15, and a cam 1 is connected to the gear 15.
6 is formed. In some cases, the cam 16 turns on and off the microswitch 17 to obtain a weak high-frequency output for thawing or stewing cooking. but,
Generally, the rotation speed of the rotary plate 2 of a microwave oven is obtained from improving heating efficiency and reducing heating unevenness, and is approximately 6 to Brpm (
7.5 to 10 seconds/1 revolution) is normal. On the other hand, the weak output is approximately 50-40% of the normal output, and the gear 15
Reduce the rotation speed by about half (approximately 3 to 4 rpm).

15 to 20 seconds/one revolution), the cam 16 is rotated, and the microswitch 17 is turned on and off. If the cam surface is formed so that the weak output can be taken at 50% of the normal output, the on time of the microswitch 17 will be 7.5 to 10 seconds, and the off time will also be 7.5 to 10 seconds.
．． It takes 5 to 10 seconds, and a weak output is obtained by repeating this process.

Furthermore, if the cam surface 16 is provided directly on the rotating shaft 4, the period will be 7.5 to 10 seconds, and the on time of the weak output will be approximately 3.8 to 5 seconds, which means that the time during which high frequency waves are radiated will be too long. Short and skillful defrosting and stewing operations are not possible, and the number of times the microswitch 17 is turned on and off doubles, reducing its lifespan. Therefore, a reduction mechanism such as gears 14 and 15 is required,
The structure is complicated, which increases costs.

[Purpose of the invention]

This invention was made with attention to the above-mentioned circumstances, and its purpose is to improve the cleaning efficiency inside the oven, and to enable the rotary plate to rotate smoothly despite having a simple structure. Furthermore, it is an object of the present invention to provide a high-frequency heating device that can improve heating efficiency and reduce heating unevenness.

(Summary of the Invention) In order to achieve the above object, the present invention provides a rotary drive machine.
A roller holder that rotates by a mechanism is interposed between the bottom of the oven and the rotating plate, and the roller holder is provided with a plurality of rollers that transmit rotational force to the rotating plate while rolling on the bottom of the oven. The reason is that a radio wave stirring section is installed in the

(Embodiment of the Invention) Hereinafter, an embodiment of the present invention will be described based on the drawings.

In FIG. 5, 21 is the main body of the high frequency heating device, and 22 is an oven. The bottom of this oven 22 has an opening 2.
3 is provided, and a mounting plate 24 is provided at the lower part facing this opening 23.

In this installation, the plate 24 is equipped with a motor 92 that constitutes a rotational drive mechanism.
5 is attached, and this rotating shaft 26 passes through the opening 23 and projects to the inner bottom of the oven 22. on the other hand,
27 is a rotating plate on which the object to be heated is placed, and this rotating plate 2
7 and the bottom of the oven 22 is a roller holder.
28 is detachably installed. This roller holder 2
As shown in FIGS. 6 and 7, 8 has a disk shape made of metal or the like that easily reflects radio waves, and a flange 29 is provided on the outer peripheral edge of the disk. Furthermore, a retaining portion 31 that engages with the pin 30 at the tip of the rotary ring 26 is protruded from the center of the lower surface of the O-ra holder 28 . Also,
The flange portion 29 has four roller shafts 32 arranged at equal intervals.
... are provided protrudingly, and rollers 33 ... are rotatably supported on these low chamber shafts 32 .... Therefore, the roller 33 supported by this roller holder 28
... are interposed between the bottom surface of the oven 22 and the bottom surface of the rotary plate 27, and as the rotating roller holder 28 rotates, the rollers 33...Z move the bottom surface of the oven 22 by L<-. The rotation is transmitted to the rotating plate 27.

Furthermore, the engaging portion 3 is provided on the plate surface of the roller holder 28.
Bosses 28 radially form a radio wave agitation section centered on 1.
a... is formed. Furthermore, the roller contact surfaces 34.35 on the bottom surface of the oven 22 and the bottom surface of the rotary plate 27 that come into contact with the roller 33 are formed into ring protrusions 36.37. Further, as shown in FIG. 8, a cam 38 is mounted on the rotating shaft 26 of the motor 25. A microswitch 39 is in contact with this cam surface.

Next, the operation of the above embodiment will be explained. First, motor 2
5, the rotating shaft 26 rotates at the required number of rotations (for example, 3
r , o m ), and this rotation is transmitted to the roller holder 28 via the bin 30 . When the roller holder 28 rotates, the rotational force causes the rollers 33 to move on the bottom surface of the oven 22. When the rollers 33... are transferred, rotational force is transmitted to the rotating plate 27 that is in contact with the roller 33, and the rotational force is transmitted to the rotating plate 27 that is in contact with the roller 33, and the rotational force is transmitted to the rotating plate 27 in the same direction as the roller holder 28 at twice the rotation speed (6rl) m) of the roller holder 28. Rotate. That is, as shown in FIG. 9, when the roller 33, which was initially at the position A, rotates half a turn and advances to the position B [a], the rotary plate 27 is moved from the position X to the position W; Come to position Y. Therefore, when the roller 33 rotates half a rotation, the roller holder 28 advances by a distance a, and the rotary plate 27 moves 2Xa from the W position to the Y position. After one rotation, the roller 33 advances by a distance b to A-C, and the rotary plate 27 moves to the v-7 position and rotates in the same direction as the roller holder 28 at twice the number of rotations.

At this time, the cam 38 fitted on the rotating shaft 26 is rotated (3 rpm) L by the rotation of the rotating shaft 26, and the microswitch 39 is turned on and off by the cam surface. At this time, if the weak output is set to 50% of the normal output, the on time will be 10 seconds and the off time will also be 10 seconds (cycle 20 seconds). Furthermore, since the rotating plate 27 and the roller holder 28 have different rotational speeds as described above, the speed of the roller holder 28 relative to the food differs, and furthermore, since the roller holder 28 has a radio wave stirring section, The electric field within oven 22 is more uniformly absorbed by the food.

In the above-mentioned embodiment, the roller contact surfaces 34.35 on the bottom surface of the oven 22 and the bottom surface of the rotary plate 27, which contact the rollers 33, are formed into ring convex strips 36.37. It is easy to remove the JN even if the oven 22 is heated, the cleaning performance is improved, normal rotation can be expected, and the weight of the food is easily distributed over the entire bottom surface of the oven 22, making it difficult to deform. Therefore, cooking can be done in a stable electric field.

Moreover, since the outer circumferential surfaces of the rollers 33 are arcuate, they come into almost point contact with the roller contact surfaces 34 and 35, reducing the probability of contact with food particles and garbage, and the rotating plate 27. Vibration and abnormal noise can be prevented.

Further, in the above embodiment, the roller holder 28 was formed in a disk shape, but as shown in FIG.
It is also possible to use a roller holder 41 that is pivotally supported.

(Effect of the invention) As explained above, according to the present invention, the rotary drive 14
The driving force #I is transmitted to the roller holder, and this rotational force causes the roller to roll on the bottom of the oven and rotate the rotary plate, so even if there is food residue or dirt on the bottom of the oven, it will not work. The O-La has the effect of overcoming these and transferring and rotating smoothly. Therefore, there is no need to frequently clean the bottom surface of the oven, and the cleaning performance is greatly improved. Furthermore, since the roller holder is provided with a radio wave stirring section, the electric field in the oven is more uniformly absorbed into the food, which has the effect of improving heating efficiency and reducing heating unevenness. Furthermore, since the rotary plate is supported by the plurality of rollers of the roller holder, it is possible to prevent the rotary plate from tilting, and the durability is also improved.

[Brief explanation of drawings]

1 to 3 are longitudinal sectional front views showing different conventional rotating plate drive mechanisms, FIG. 4 is a perspective view of the roller holder shown in FIG. 3, and FIG. 5 is a microwave oven showing an embodiment of the present invention. FIG. 6 is an enlarged vertical front view of the rotary drive mechanism, FIG. 7 is a perspective view of the roller holder,
FIG. 8 is a plan view of the cam, FIG. 9 is a diagram for explaining the operation, and FIG. 10 is a perspective view showing another embodiment of the roller holder of the present invention. 22...Oven, 25...Motor (rotation drive mechanism), 27...Rotating plate, 28...Roller holder, 28
a...Boss (radio wave stirring part), 33...O-ra. Applicant's agent Patent attorney Takehiko Suzue Figure 6 Figure 7 Figure 8 Figure 9

Claims (2)

[Claims] (1) An oven, a rotary plate provided in the oven on which an object to be heated is placed, a roller holder that is removably interposed between the bottom of the oven and the gate of the rotary plate, and the roller holder. a plurality of rollers rotatably supported by the roller holder and transmitting rotational force to the rotary plate while moving around the bottom of the oven; and the roller holder provided at the bottom of the oven. A high-frequency heating device characterized by comprising a rotational drive mechanism that applies rotational force to the. (2) The high-frequency heating device according to claim 1, wherein the radio wave stirring section is a radial boss.