JP2003142251A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency heating device with improved reliability of a turn table mechanism by which, uneven heating of an object to be heated is reduced, which is easy to clean. SOLUTION: For a driving shaft conducting the rotation of a rotation mechanism to a dish in a heating chamber, a heat radiation of a driving shaft 8 caused by high frequency and a stationary wave having a start point at the driving shaft 8 can be reduced by forming only one convex-shaped part at the part extending from a center of the shaft toward outer periphery. By the above, reliability of rotation function is improved and high frequency distribution with few uneven heating is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device, and more particularly to a so-called turntable mechanism for mounting and rotating an object to be heated.

[0002]

2. Description of the Related Art A conventional high-frequency heating apparatus will be described with reference to FIG. In FIG. 5, a high-frequency heating device 1 has a door 2 that can be opened and closed in a front opening, and a heating chamber 3 that stores and heats an object to be heated such as food. A saucer 4 on which an object to be heated is placed and rotated in the heating chamber 3.
There is a rotation function 5 for rotating the pan 4 on the outside of the bottom surface of the heating chamber 3. Further, 6 is a magnetron for supplying a high frequency into the heating chamber 3.

FIG. 6 is an enlarged cross-sectional view of a main part of a turntable part for placing and rotating an object to be heated of the high-frequency heating device. In FIG. 6, 7 is an output shaft of the rotating function 5,
Reference numeral 8 is a drive shaft that transmits the rotation of the output shaft 7 to the tray 4.
Reference numeral 9 denotes a roller portion including a plurality of rollers and a roller support portion, on which the tray 4 is placed and which rotates as the tray 4 rotates. FIG. 7 is a perspective view of the drive shaft 8.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
Although the drive shaft 8 is formed of a low dielectric material, it is located in the center of the pan 4 and does not change its position with respect to the heating chamber 3 even if it is rotated together with the pan 4, so that it is easy to absorb high frequency waves, especially in the heating chamber 3. When high-frequency heating is performed without putting food or other objects to be heated, more high-frequency is absorbed and the temperature is often very high. As a result, there is a problem that the coil temperature of the rotating function 5 rises due to the heat received by the drive shaft 8 that has generated heat from the output shaft 7 of the rotating function 5, and the performance of the rotating function 5 is degraded and the life of the rotating function 5 is shortened. Further, when the output shaft 7 is formed of a resin such as nylon, the output shaft 7 may be deformed by the heat received from the drive shaft 8 and the rotation cannot be transmitted to the tray 4.

On the other hand, when an object to be heated such as food is placed in the heating chamber 3 and subjected to high-frequency heating, many high-frequency standing waves are generated with the drive shaft 8 as a reference, so the object to be heated is close to the drive shaft 8. The temperature at the center was high and the temperature at the periphery was low, which tended to result in uneven temperature distribution.

Further, the drive shaft 8 has many protrusions, and the heating chamber 3
When cleaning the product, it is very difficult to remove stains such as boiling water on the object to be heated between the convex portions of the drive shaft 8, and there is a drawback that the drive shaft is caught when it is wiped off.

The present invention solves the above-mentioned conventional problems, and provides a high-frequency heating apparatus which improves the life and performance reliability of a turntable mechanism, is easy to clean, and reduces uneven heating of an object to be heated. The purpose is to

[0008]

In order to solve the above-mentioned conventional problems, the high frequency heating apparatus of the present invention is one in which only one convex portion of the drive shaft is formed.

As a result, the drive shaft can be downsized and the high frequency absorption in the drive shaft can be alleviated, so that the drive shaft generates less heat and less heat is transmitted to the rotating function. In addition, by reducing the size of the drive shaft, the number of standing waves originating from the drive shaft is reduced, and a uniform high-frequency distribution with a small temperature difference between the center and the periphery of the object to be heated can be obtained. As a result, it is possible to provide a high-frequency heating device that has a highly reliable life and performance of the turntable mechanism, is easy to clean, and has less uneven heating of the object to be heated. Further, it is necessary to form the drive shaft by downsizing the drive shaft. There is also an effect of resource saving because the material can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 has a heating chamber for accommodating an object to be heated, a saucer for mounting and rotating the object to be heated, and a rotating function provided outside the bottom surface of the heating chamber. It is equipped with a rotating shaft extending from the rotating function and a drive shaft that penetrates the bottom wall of the heating chamber and transmits the rotation of the rotating shaft to the saucer. The rotation can be stably transmitted to the saucer by fitting with the protrusion provided on the.

The invention as defined in claim 2 is particularly defined by claim 1.
By reducing the size of the drive shaft from the center of the drive shaft to the outer periphery with only one convex shape, absorption of high frequency into the drive shaft is alleviated and heat generation of the drive shaft is reduced. The heat transmitted to the rotating function is also reduced, the life and performance reliability of the turntable mechanism are improved, and the downsizing of the drive shaft reduces standing waves originating from the drive shaft, reducing the It is possible to obtain a uniform high-frequency distribution with a small difference in ambient temperature and little heating unevenness.

The invention as defined in claim 3 is particularly defined by claim 1.
Alternatively, by forming the convex shape of the drive shaft described in 2 in the shape of a fan toward the outer periphery, the rotational force can be transmitted at a right angle to the rotational direction of the pan, so that the pan rotates stably and the turntable mechanism is provided. The reliability of can be further improved.

The invention as defined in claim 4 is particularly characterized by claim 1.
Alternatively, by forming the shape of the drive shaft described in 2 from the center of the shaft to the outer periphery without a recess, the drive shaft is provided on the bottom of the heating chamber in a shape with no unevenness. Easy to clean because it does not get caught on the drive shaft when wiping off stains such as broth that are easy to clean.

According to a fifth aspect of the present invention, in particular, heating is performed by providing a conical or polygonal pyramid-shaped recess on the bottom of the heating chamber of the high-frequency heating apparatus according to the first aspect. When inserting the saucer into the chamber, it becomes possible to clearly know the position where the saucer is placed, and it is possible to avoid incomplete fitting of the drive shaft and the saucer, and the saucer does not rotate, resulting in poor cooking quality. It is possible to prevent such failures.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view of a drive shaft in Embodiment 1 of the present invention, and FIG. 2 is an enlarged sectional view of a turntable portion of the high frequency heating apparatus.

In FIGS. 1 and 2, reference numeral 8 denotes a drive shaft in which only one convex portion is formed from the center of the shaft toward the outer periphery, and the drive shaft rotates through the bottom surface of the heating chamber 3 having a conical concave portion. The rotation of the rotary shaft 7 extending from the function 5 is transmitted to the tray 4 arranged in the heating chamber 3. Reference numeral 9 denotes a roller portion composed of a plurality of rollers and a roller support portion, which supports the tray 4 and the object to be heated placed on the tray 4 while supporting the tray 4
Rotates with the rotation of.

The operation and action of the turntable mechanism constructed as above will be described below.

First, the rotating function 5 outputs a rotating force to the rotating shaft 7, and the drive shaft 8 fitted to the rotating shaft 7 penetrates the bottom surface of the heating chamber 3 and rotates in the heating chamber 3 about the shaft center. . The convex portion of the drive shaft 8 fits into a protrusion or the like provided on the bottom surface of the saucer 4, and the saucer 4 rotates. Since the drive shaft 8 has only one convex portion, it is smaller than the conventional one.

As described above, in this embodiment, the drive shaft 8 has only one projecting portion toward the outer periphery, so that the drive shaft 8 can be downsized while maintaining its original function of transmitting rotation. Therefore, the drive shaft 8 can be alleviated from generating heat by absorbing high frequency. Since the heat transmitted to the rotating function 5 is reduced by relaxing the heat generation of the drive shaft 8, the stability of the rotating performance of the rotating function 5 is improved, and the life of the rotating function 5 can be extended.

Further, by miniaturizing the drive shaft 8, the standing wave generated with the drive shaft 8 as a reference is reduced, and the temperature difference between the center and the periphery of the object to be heated is small, and a uniform high-frequency distribution with little heating unevenness is obtained. be able to.

(Second Embodiment) FIG. 3 is a perspective view of a drive shaft 8 according to a second embodiment of the present invention. The difference from the configuration of the first embodiment is that the convex shape is formed in a fan shape from the axial center toward the outer circumference.

In this embodiment, since the rotational force can be transmitted at a right angle to the rotation direction of the tray 4, the rotation of the tray 4 is stable and the reliability of the turntable mechanism can be further improved.

(Embodiment 3) FIG. 4 is a perspective view of the bottom surface of the heating chamber 3 in Embodiment 3 of the present invention. The difference from the configuration of the first embodiment is that the drive shaft 8 is formed in a shape having no recess from the center of the shaft toward the outer circumference, and the recess on the bottom surface of the heating chamber 3 is deepened into a quadrangular pyramid shape. . The same reference numerals as those in the first embodiment have the same structure, and the description thereof will be omitted.

In the present embodiment, the position of the tray 4 is regulated by the concave portion of the bottom surface of the heating chamber 3 which is deepened like a quadrangular pyramid, and the drive shaft 8 and the protrusions provided on the bottom surface of the tray 4 can be easily fitted together. it can.

Further, since the shape of the drive shaft 8 is formed so as to have no recessed portion from the center of the shaft to the outer periphery, the drive shaft 8 is caught even if the bottom surface of the heating chamber 3 gets dirty due to simmered material to be heated. It can be wiped off easily and can be kept clean.

[0027]

As described above, according to the invention described in claims 1 to 5, the turntable mechanism has high reliability of life and performance, is easy to clean, and is high-frequency heated with less uneven heating of an object to be heated. It is possible to provide a device and further reduce the material by reducing the size of the drive shaft, so that it is possible to provide a resource-saving high-frequency heating device.

[Brief description of drawings]

FIG. 1 is a perspective view of a drive shaft according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the turntable part according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a drive shaft according to a second embodiment of the present invention.

FIG. 4 is a perspective view of the bottom surface of the heating chamber according to the third embodiment of the present invention.

FIG. 5 is a schematic side sectional view of a conventional high-frequency heating device.

FIG. 6 is an enlarged sectional view of a conventional turntable portion.

FIG. 7 is a perspective view of a conventional drive shaft.

[Explanation of symbols]

1 High frequency heating device Two doors 3 heating chambers 4 saucer 5 rotation function 6 magnetron 7 Output shaft 8 drive shafts 9 Roller part

Claims (5)

[Claims] 1. A heating chamber for accommodating an object to be heated, a saucer on which the object to be heated is rotated, a rotating function provided outside the bottom surface of the heating chamber, and a rotating shaft extending from the rotating function. A high-frequency heating device having a drive shaft that penetrates the bottom wall surface of the heating chamber and transmits the rotation of the rotary shaft to the tray, and the drive shaft forms a convex portion from the center of the shaft toward the outer periphery. 2. A heating chamber for accommodating an object to be heated, a saucer provided at the bottom of the heating chamber, a plurality of saucers provided between the saucer and the bottom surface of the heating chamber, and supporting the saucer. A circular roller base having a roller on the outer periphery, a rotation function provided on the outside of the heating chamber bottom surface, a rotation shaft extending from the rotation function, and a rotation of the rotation shaft penetrating the heating chamber bottom wall surface. A high frequency heating device comprising: a drive shaft for transmitting to a saucer, wherein the drive shaft is formed with a convex shape only at one place from the center of the shaft toward the outer periphery. 3. The high-frequency heating device according to claim 1, wherein the shape of the convex portion of the drive shaft is fan-shaped from the center of the shaft toward the outer periphery. 4. The high-frequency heating device according to claim 1, wherein the drive shaft is formed so as to have no recessed portion from the shaft center toward the outer periphery. 5. The high-frequency heating apparatus according to claim 1, wherein the bottom surface of the heating chamber is provided with a concave portion that is deepened in a conical shape or a polygonal pyramid shape.