JPS6062098A - Turntable unit of 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] The present invention relates to improvements to a turntable device for a high frequency heating device.

[Technical background of the invention and its problems]

In microwave ovens (high-frequency heating devices), a turntable device is used as a device that can uniformly apply microwaves to an object to be heated, such as food, to achieve good heating.

Conventionally, as shown in FIG. 1, this type of turntable device has a 7-amp housing installed on the bottom wall of a heating chamber a to cool electrical components such as a magnetron B1 and a high voltage transformer C.
A gear motor f is provided separately from the fan motor e, and the output l1qll'H of the gear motor f is connected to the heating chamber a.
A structure is used that connects the rotating plates inside the gear motor f.
The power 68i drives the rotary plate 1+'f:'C.

However, such a structure in which a gear motor f is provided separately in addition to the cooling fan motor e to drive the rotary plate has the disadvantage of being extremely expensive. Moreover, since the gear motor f includes a gear system and an electric part, it is heavy, and therefore the bottom wall of the heating chamber a is easily deformed. In particular, if an external force is applied to the microwave oven, such as by dropping it, during transportation, the bottom wall may be significantly deformed downward by the weight of the gear motor f, and once deformed, the electric field inside the heating chamber a Not only does this turbulence make stable microwave cooking impossible, but in extreme cases, there is no spark and it is dangerous. In addition, since the gear motor has a large speed (rotating plate is approximately 8 to io, rpm), the overall size inevitably increases.
There is a problem in that the height t between the heating chamber a and the main body i needs to be wide, which is a bottleneck in making the microwave oven product more compact.

Therefore, in recent years, a turntable device as shown in FIGS. 2 to 4 has been commercialized, which rotates a rotating plate using the power of a fan motor e of a fan d that cools electrical components.

That is, this turntable device has a small boob IJk installed at the rear end of a fan motor e installed in the upper stage of a machine room j, and a shaft n connected to a large-diameter pulley m connected to the bottom wall of a heating chamber a. A gear case p is rotatably supported and further includes a worm gear mechanism 0 as shown in FIG. 4 at the lower stage of the machine room j. Then, a large pulley r is provided at the end of the worm shaft q, a small pulley t is provided at the end of the worm wheel sheath V), and the small pulley of the 7-arm motor e and the large pulley r of the form gear mechanism 0 are connected , and the small pulley t of the worm gear mechanism 0 and the pulley m connected to the rotary plate are connected by a bell) u, and as the fan motor e rotates, the small pulley k, the belt pulley 1, the large pulley r1, the worm gear mechanism 0, Small pulley upper 1 belt u
1 pulley ITI rotates through the shaft n in order fin
h can be rotated.

However, this [she who receives the eel rotation dish] n
The structure in which the belt U is hung on the shirt has the disadvantage that the tension of the belt constantly acts as a force that deforms the bottom wall of the heating chamber a through the bearing V that supports the shirt n as shown in FIG.

Therefore, when the temperature of the inner bottom surface of the heating chamber a rises during cooking, the bottom wall deforms along with the applied force. If such a deformation occurs, the electric field 7 in the ripening chamber a will be disturbed and stable cooking will not be possible as mentioned earlier, or the inclination of the shaft n will change f'r. Due to the inclination of the rotating plate, the food W on the rotating plate 11 is thrown out! I!
It moves toward I due to the centrifugal force, causing a problem in which it rarely hits the monolithic wall of the heating chamber a. Therefore, using two such bells) u, u zo, - with a turntable device)
Reinforcing plates x and x are attached to the wall of the sleeping area of ``A'', but this is a costly mistake and is not very effective. In other words, even if it does not deform, as shown in Fig. 6, belt tension is constantly applied to the bearing part V in the thrust direction, so it tends to wear out on one side, and as a result, after long-term use, the slope of The rotating plate is tilted.

Moreover, since the bell) is installed in a horizontal position, it is susceptible to the influence of gravity and easily falls off or comes off due to vibration.
In addition, due to the reduction ratio, it was necessary to stretch the belt U against the bottom wall of the heating chamber A, and it was not easy to assemble. The transmission efficiency of the transmission of the rotation of the fan motor e to the shaft n is not good, and the bell) U is stretched along the bottom of the heating chamber a, which has poor ventilation and tends to trap heat from the heating chamber a. I set it up,
The material of the bell (U) must be made of an expensive material such as heat-resistant silicone, which increases the cost.In addition, the bell (U) stretched along the bottom is always at a high temperature when the heating is adjusted. Although exposed to the atmosphere, the lifespan of Bell) is short;
In addition, it tends to stretch when the temperature rises, causing slippage, which poses problems in terms of reliability.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to provide a highly reliable product that can perform heating in a stable electric field and improve durability and ease of assembly. An object of the present invention is to provide a turntable device for a high frequency heating device.

[Summary of the invention]

That is, in this invention, a gear mechanism is provided on the bottom wall of the heating chamber, and the output shaft passes through the bottom wall and is locked to the rotating plate, and the input shaft is provided with a dog pulley. A belt placed along the outside surface of the heating chamber is connected to a pulley on the output shaft of the fan motor, improving transmission efficiency while reinforcing deformation of the bottom wall of the heating chamber and the shaft that receives the rotating plate. In addition to preventing the need for a board,
This is to avoid the thermal influence of the belt.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings. Figure 7 shows the appearance of a microwave oven as a high-frequency heating device, Figure 8 shows its front cross section, and Figure 9 shows the same.
The cross section, FIG. 10 similarly shows the back cross section, and FIG. 11 similarly shows the plane cross section, and numeral 1 in the figure is the main body. A heating chamber 2 is provided in the left side of the main body 1, and a machine chamber 3 is formed in the right side 11 of the main body 1. Further, a magnetron 4 is provided at the center of the upper stage of the machine room 3. Then, this magnetron 4 is connected to the medium heat of the earthen wall of the heating chamber 2 through the waveguide 5, and becomes an element capable of oscillating microwaves inside the heating chamber 2 through the waveguide 5. There is.

In addition, a heat shield plate 6 is interposed in the machine room 3 at the boundary between the machine room 3 and the heating chamber 2 to prevent heat from flowing from the heating chamber 2 side to the machine room 3. I have to. In the figure, 7 is a door supported on the front side of the main body 1 for opening and closing the opening of the heating chamber 2, and 8 is an operation panel provided adjacent to the door 7. On the other hand, 9 in the figure is a magnetron 4 in the machine room 3.
This is a partition plate installed at the rear stage of the .

This partition plate 9 is composed of an L-shaped plate material having a width corresponding to the dimension between the heat shield plate 6 and the main body 1 and a length corresponding to the height dimension of the machine room 3. , Machine room 3
is divided into the front side and the rear side. A bell mouth (orifice for preventing backflow) 10 is provided in the upper part of the partition plate 9 facing the magnetron 4, and
A fan 11 is disposed within this bell mouth 10.

Further, a fan motor 12 for driving a fan 11 is connected to a bell mouth 10 of the partition plate 9 via a fan motor number plate 13 formed in a U-shape. A small pulley 15 is provided at the rear end of the output shaft 14 passing through the mounting plate 13 of the fan motor 12. Further, a U plate 17 is formed on the fan motor measuring plate 13,
Through this installation & 17, the fan motor 12 is fixed to the wall 11 (1j) of the heating chamber 2.The small pulley 15 is arranged to protrude rearward inside the main body 1. At the bottom of the rear machine room 3, which is partitioned by a partition, there is an intake port 18 formed by a large number of small holes. Further, the bottom of the front machine room 3 partitioned by the partition plate 9 is provided with a large number of small holes and an exhaust port 20 called 'C'. On the 1flIj surface of the partition plate 9 facing the
As the fan 110 rotates, air is taken in from the intake port 18 and directed from the machine room 3 to the exhaust port 20.
, high-voltage condenser 21, and other electrical components can be cooled. Further, on the front side of the magnetron 4, an intake duct 22 that guides the cooling air reaching the magnetron 4 into the heating chamber 2 is connected. An exhaust port (not shown) and an exhaust duct 23 that communicates the exhaust port with the outside of the main body 1 are provided at the rear left corner, and the inside of the heating chamber 2 is ventilated with cooling air reaching the magnetron 4. is now possible.

On the other hand, a rotating plate 24 is rotatably disposed at the center of the inner bottom of the heating chamber 2. Further, a gear mechanism 25 is provided on the back side of the bottom wall of the heating chamber 2, as shown in FIG. The external appearance of this gear mechanism 25 is shown in FIG. 13, and the detailed internal structure is shown in FIG. 14. Here, the structure of the gear mechanism 25 will be explained as shown in 2 in the figure.
6 is a case. This case 26 includes a box-shaped lower mounting plate 27 whose interior is divided into two spaces, and a plate-shaped upper mounting plate 28 that closes the opening of the left side space of the lower number plate 27.
It is composed of. In addition, 29 is a fixing flange provided at the open end of the lower mounting plate 27, and 30 is the lower mounting plate 27.
This is a partition wall having a fixing flange 3 at the upper end of which the inside is partitioned. The space on the left side of the lower IIO mounting plate 27 is used as a gear chamber 36, and an output shaft 34 having a large-diameter spur gear 32 and a small-diameter spur gear 33 arranged in an overlapping manner is rotatably installed at the center of the bottom of the gear chamber 36. There is. Note that 35 is a bearing that thrust-bears the lower end of the output shaft 34. Further, at the bottom of the gear chamber 36, adjacent to the output shaft 34, the spur gear 3 is provided.
Small diameter spur gear 37 and worm wheel 38 that mesh with 2
A worm wheel shaft 39 is rotatably arranged. On the other hand, numeral 40 in the figure is a worm shaft that passes through the gear chamber 36 and the space adjacent to the gear chamber 36 and forms an input shaft t1'4 that is rotatably installed in a horizontal position. A worm 4 that meshes with the worm wheel 38 is provided at the end of the worm shaft 40 that projects into the gear chamber 36.
A reduction gear mechanism 43 comprising a worm gear mechanism 42 which is compact and has a large deceleration is configured within the gear 36.

Further, a large pulley 44 is provided at the end projecting from the lower mounting plate 27 to the outside. . Note that 45 is a bearing that supports the gear chamber 36 side end of the worm gear mechanism member 40, and 46 is a bearing that supports the externally protruding end of the worm shaft 40. On the other hand, on the back surface of the upper (III) mounting plate 28, a bearing portion 47 for bearing the output shaft 34 is provided at the center, and adjacent to the bearing portion 47, a bearing portion 47 for bearing the output shaft 34 is provided.
A rotary shaft 50, on which a small-diameter spur gear 48 meshing with the spur gear 33 and a cam 49 are arranged in an overlapping manner, is rotatably protruded. A microswitch 51 for changing the output of microwave oscillation is provided on the lower mounting plate 27 corresponding to the cup surface of the cam 49.
8 is screwed to the lower mounting plate 27 using the mounting holes 52 formed on the peripheral edge thereof, the reduction mechanism 43 including the worm gear mechanism 42 is installed inside the case 26,
The unit is configured such that the tip end t ((l) of the output shaft 34 protrudes upward from the bearing portion 47 and the dog pulley 44 protrudes from the case 26.

The gear mechanism 25 configured in this way and having λ is the 12th gear mechanism 25.
As shown in the figure, the high-strength corner at the rear of the heating chamber 2 is used as the fixing part 53, and the upper surface of the case 26 is in close contact with the bottom wall of the heating chamber 2, and the tip of the output shaft 34 is connected to the heating chamber. It is fixed using screws 53a... in a state where it penetrates into the interior from the medium heat at the bottom of the case. Along with this fixation, the dog pulley 44 is placed on the outer surface of the heating chamber 2 so as to protrude rearward. In addition, an upper mounting plate 2 that is a wall portion of the case 26 facing the bottom wall of the heating chamber 2 is provided.
A circular recess 54 is provided around the output shaft 34 of the heating chamber 2, and together with a convex portion 55 formed around the output shaft 34 on the bottom wall of the heating chamber 2, -C1 from inside the heating chamber 2. Microwaves leaking through the output shaft through hole 56 can be prevented. That is, a sufficient choke cavity 57 is formed within the recess space. Furthermore, each mounting hole 52 of the upper mounting plate 28 has a first hole.
As shown in Fig. 3 and Fig. 14, each fixing flange 29
Convex portions 28a projecting from -C with respect to ゜3 are each provided with C, and the upper side plate 26 and the lower i++++ mounting plate 2
As shown in FIG. 15, the gap 58 formed between the contact portion with the gear unit 25 and the heating chamber 2 can be used as a ventilation hole to ventilate the inside of the gear unit 25 and the lower space between the heating chamber 2 and the main body 1. It has become.

Then, the output shaft 34 of the gear mechanism 25 installed in this way
The rotary plate 24 is removably locked at the tip of the fan moke 12, and the large pulley 44 of the gear mechanism 25 and the fan moke 12
The small pulleys 157 are connected by a single belt 59 disposed along the rear surface, which is the outer surface of the heating chamber 2, and utilize the power source of the fan motor 12 used to cool the electrical parts. A turntable device 6 that rotationally drives the rotating plate 24
It constitutes 0.

Therefore, when cooking food, the rotary plate 2
Food may be placed on the heating chamber 4 and housed in the heating chamber 2, and then required operations may be performed through the operation panel 8. In other words, the magnetron 4 and fan motor 1 are
2 functions, and the magnetron 4 oscillates microwaves into the heating chamber 2 through the waveguide 5. On the other hand, in the fan motor 12, the fan 11 rotates as the fan motor 12 operates, takes in outside air from the intake port 18, and distributes the air into the machine room 3. Due to this air distribution, the high voltage transformer 19 and the high voltage capacitor 2
1. Electrical components such as the magnetron 4 are cooled, and the cooling air that reaches the front inside the machine room 3 is exhausted to the outside of the main body 1 through the air outlet 20. Furthermore, the cooling air that has cooled the magnetron 4 is introduced into the heating chamber 2 through the intake duct 22, and after ventilating the inside of the heating chamber 2, is exhausted to the outside of the main body 1 through the exhaust duct 23.On the other hand, the small pulley 15 is operated by a fan. It rotates with the operation of the motor 12, and transmits driving force to the large pulley 44 of the gear unit 25 through the belt 59. Then, the gear unit 25 receives the driving force by the worm gear JP mechanism 42 to further decelerate, and the deceleration output is transmitted from the spur gear 37 to the large-diameter spur gear 32 to obtain the applied force @34. The rotating plate 24 will be rotated at the final deceleration rotation. Then, the output of the red sea tron 4 is changed by turning ON and 10 F F' based on the joint rotation of the mouth 1 and 24, and using these to properly heat the food. I will let you do it.

Thus, as the turntable device 6o, the output 'I
It is possible to directly transmit the drive from the fan motor 12 to the rotating plate 24 without applying any biasing force to the heating chamber 2.・It is possible to prevent tilting of the force shaft 34 and deformation of the bottom wall of the heating chamber 2, and to perform stable heating and cooking with high transmission efficiency.Moreover, since the gear mechanism 25 does not have a moving part, It is extremely compact and lightweight, and since the strong corners of the heating chamber 2 are fixed as fixed parts, there is no deformation of the heating chamber 2, making it highly reliable and suitable for life's work. Furthermore, since the gear mechanism 25 is not only unitized but also compact and has a large deceleration, it occupies less space and can be assembled easily. belt 59
Since the belt 59 is arranged along the outer surface of the heating chamber 2 with good ventilation, it is not affected by the heat from the heating chamber 2, and there is no need to worry about elongation of the belt 59, which can cause slipping, and at the same time, the service life can be shortened. It is possible to improve the Moreover, since no special heat resistance is required, an inexpensive belt 59 can be used.

In addition, by providing the recess 54 in the case 26, the heating chamber 2
It is possible to prevent microwaves from leaking from inside the main body 1 through the periphery of the output shaft 34 into the main body 1 with a sufficient choke cavity effect.
By forming the gap 58 serving as a ventilation hole, there is an advantage that the ventilation inside the main body 1 can be improved.

In addition, in the above-mentioned embodiment, the belt was arranged along the rear part of the heating chamber.
They may be arranged along the sides.

〔Effect of the invention〕

As described above, according to the present invention, deformation of the bottom wall of the heating cup and the shaft that receives the rotary plate can be prevented by direct transmission using gears without the need for a reinforcing plate.

Moreover, since the gear Ytfl structure can be small, it is possible to improve the ease of assembly, and since the belt is placed on the outside side of the heating chamber with good ventilation, it is not affected by heat. It has the advantage of not having to worry about elongation and requires only a belt made of an inexpensive material, can perform heating in a stable electric field, has improved surface durability, and is highly reliable.

[Brief explanation of drawings]

Figure 1 is a front sectional view showing a conventional turntable device, Figures 2 and 3 are front sectional views showing different turntable devices, and Figure 4 is a sectional view of the transmission system. Fig. 5 is a partial front sectional view showing the deformation of the heating chamber caused by the belt tension, Fig. 6 is a partial view showing the shirt and its surroundings, and Figs. One embodiment of the invention is shown, FIG. 7 is a perspective view showing a high frequency heating device, FIG. 8 is a front sectional view thereof, and FIG. 9 is the same.
mtl l'W? 10 is a back sectional view, FIG. 11 is a plan sectional view, FIG. 12 is a sectional view showing the rotation of the gear, and FIG. 13 is a plan view of the gear mechanism. 2... Heating chamber, 4,19.21... Magnetron,
High voltage transformer, high voltage capacitor (1, gas parts), 11.
...Fan, 12-゛Fanmorph 15. ,, small pulley, 24... rotating plate, 25... gear mechanism, 34...
...Output 1L 4o...Worm shaft (input shaft)
, 44...Large pulley, 59...Belt, 60-°°
Kuhntaple device. Figure 1 Figure 3

Claims (4)

[Claims] (1) In a turntable device in which a small pulley is provided on the output shaft of a fan motor that drives a fan that cools electrical components, and a rotating plate in a heating chamber is driven through this small pulley, the output shaft is attached to the bottom wall of the heating chamber. passes through the bottom wall and locks onto the rotating plate, and a gear mechanism is provided with a large pulley on the input shaft, and the thick pulley of this gear mechanism is connected to the small pulley by a belt placed along the outer surface of the heating chamber. A turntable device for a high-frequency heating device, characterized in that the turntable device is connected to a high-frequency heating device. (2) The turntable device of the high-frequency heating device according to claim 1, wherein the gear mechanism is configured as a unit by incorporating a reduction gear mechanism including a worm gear mechanism in a case. . (3) The turntable device for a high-frequency heating device according to claim 2, wherein the case is fixed to the bottom wall of the heating chamber by closing a corner of the heating chamber as a fixing portion. (4) The turntable device for a high-frequency heating device according to claim 1, wherein the gear mechanism is arranged such that a large pulley protrudes from an outer surface of the heating chamber.