JPS5824400Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to uniform heating in a high frequency heating device.

Microwave ovens using a rotating mounting table called a turntable have been widely used, but they have the following problems (A) and (B).

(A) Since there were plants such as drive shafts and rollers that penetrated the bottom of the heating chamber, it was difficult to clean them, which made them easy to clean and caused problems such as radio wave leakage from the shafts that penetrated the heating chamber. Ta.

(B) Uniformity is achieved in the circumferential direction of the rotary mounting table, but there is no effect at all in the radial direction.

In other words, when a food item is placed on a rotary mounting table, and if one side of the food product faces the center of the heating chamber, it will always remain facing the center no matter how much the rotating table rotates.

In particular, in conventional rotating table type microwave ovens, the electric field in the center of the heating chamber is generally weak, and therefore, the portion facing the center of the heating chamber is difficult to heat.

Therefore, the present invention solves the above-mentioned conventional drawbacks with a simple structure, and one embodiment of the present invention will be described below with reference to the accompanying drawings.

The heating chamber 1 is constructed by welding a thin stainless steel plate such as S U 304.

High frequency energy generated by a magnetron (not shown) is guided through a waveguide 2, and a waveguide terminal end 3 projects vertically into the heating chamber 1 from the center of the top surface of the heating chamber 1.

Further, a stirrer support 4 made of a resin with low high frequency loss, such as polypropylene, is fixed to the tip of the end 3 of the waveguide 2 by screwing.

A stirrer blade 5 is rotatably provided on the support 4, and is rotated by forced cooling air from a magnetron (not shown).

Further, in order to protect the stirrer blade 5 portion, a partition plate 6 made of a silicon-impregnated glass cloth laminate is provided.

Also added; in the past, the door 8 had a hinge 9 that could be rotated freely, facing the lower door.
It's hot.

Further, the bottom plate 10 is screwed to the heating chamber 1, and a ball bearing 11 and a motor 12 are attached to the top surface thereof.

A shaft 13 made of resin such as polyacetal is attached to the ball bearing 11, and further fixed to the shaft 13.
A gear 14 made of the same material is provided and meshed with the motor 12, and a strong ferrite magnet 1 is mounted on the gear 14 at an angle of 120° to each other and equidistant from the shaft 13.
5 is fixed with adhesive.

A pedestal 16 on which a milk bottle or the like is placed is made of a dielectric material such as Teflon, and a disk-shaped magnet 17 is buried and fixed in the bottom surface with a dielectric material 18 such as silicon putty, and is attached to the ferrite magnet 15 on the gear 14. They are removably placed in corresponding positions.

A roller 20 made of a resin with a small friction coefficient, such as tetrafluoroethylene, is adhesively fixed to the upper surface of the gear 14, and the heating chamber 1
It slides under the inner bottom surface 19.

If the inner bottom surface of the bottom surface 19 of the heating chamber 1 is treated with fluororesin, the friction with the pedestal 16 will be reduced, and more stable orbital motion will be obtained. There is no such thing as causing a spark.

Regarding this matter, if the bottom surface 19 of the heating chamber 1 is made of aluminum and subjected to alumite processing of 20 microns or more, sparks can be more reliably prevented.

As explained above, according to the present invention, the pedestal can be revolved within the heating chamber without devices such as rollers or rotating shafts, which reduces costs and improves heating efficiency since there is no need for a large food table.

Generally, food mounting tables are made of heat-resistant glass that is less than 1 cm thick and weighs more than 1 kg.Glass generally has a large high frequency loss, so if you are frying an egg weighing about 60 g, for example, the food should be placed on the food rather than the egg. The high frequency power absorbed by the mounting table was much larger.

Hereinafter, "revolution" refers to the movement of the pedestal driven by a magnet provided close to the outer bottom surface, and "rotation" refers to the rotation of the pedestal.

Now, in the present invention, when the cradle is moved by the magnet at the outside bottom of the heating chamber, the pedestal rotates around a point on which the iron core on the bottom of the pedestal rests as a fulcrum.

At the next moment, the position of the fulcrum changes as the magnet provided on the outside bottom of the heating chamber moves, and the pedestal rotates again, and as a result of this repetition, the pedestal rotates on its own axis.

In this case, the rotation speed and form of the pedestal depend on the mutual relationship between the bottom of the pedestal, the height of the bottom of the heating chamber, and the weight of the object to be heated, so the number of rotations during one revolution is not necessarily constant. do not.

Therefore, it is capable of complex movements that cannot be expected from ordinary turntables, and can be expected to produce even more uniform heating effects.

Furthermore, if the pedestal is removed, there will be no plants on the bottom of the heating chamber, making it easy to clean and keeping the inside of the heating chamber clean at all times.

Further, in the embodiment described above, since the roller 20 maintains a constant distance between the gear 14 and the bottom surface 19 of the heating chamber, stable rotation can be obtained without causing horizontal wobbling of the gear even if the magnetic attraction force is strong.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a high-frequency heating device showing an embodiment of the present invention, FIG. 2 is a perspective view of the main part of the pedestal, and FIG. 3 is a longitudinal cross-sectional view of the same. 1... Heating chamber, 15... Magnet, 16.
...cradle, 17...magnet, 19...
・Bottom surface.

Claims (1)

[Scope of utility model registration request] It has a heating chamber in which food is placed and a high frequency generator that supplies microwaves to the food in the heating chamber, and is driven to rotate at a constant radius on a horizontal plane near the outer bottom of the heating chamber. A magnet is provided at the bottom of the heating chamber, and an object to be heated is placed at the bottom of the heating chamber, at a position facing the external magnet, and a disc-shaped magnet is provided on the bottom surface of the magnet in a direction in which the circular cross section is parallel to the bottom surface of the heating chamber. A high-frequency heating device with a removable pedestal.