JPH0142566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-frequency heating device, and more particularly to a so-called turntable mechanism on which an object to be heated is placed and rotated.

Configuration of Conventional Example and its Problems A conventional high frequency heating device will be described below with reference to the drawings.

FIG. 1 is a schematic side sectional view of a conventional high-frequency heating device. In FIG. 1, a high-frequency heating device 1 has a door 2 that can be opened and closed at its front opening, and a heating chamber 3 that houses and heats objects to be heated. Inside the heating chamber 3, there is a rotating saucer 4 on which the object to be heated is placed.
5 is a motor that rotates the saucer 4. Also, 6
is a magnetron that supplies high frequency waves into the heating chamber 3.

FIG. 2 is an enlarged cross-sectional view of a main part of a turntable part of the same high-frequency heating apparatus on which an object to be heated is placed and rotated.

In FIG. 2, 7 is a motor output shaft of the motor 5, which is made of a metal material. A drive shaft 8 is made of a low dielectric material and transmits the rotation of the output shaft 7 to the saucer 4. Reference numeral 9 denotes a roller section consisting of a plurality of rollers and a roller support section, on which the tray 4 is placed and rotates as the tray 4 rotates. Reference numeral 10 denotes a yoke portion disposed around the drive shaft penetrating portion on the bottom wall surface of the heating chamber.

According to this configuration, since the motor output shaft 7 is made of metal, if the motor output shaft 7 protrudes into the heating chamber or comes close to the drive shaft penetration part on the bottom wall of the heating chamber, the motor output shaft 7 becomes an antenna and the high frequency waves are transmitted outside the heating chamber. easy to be led to. Therefore, a chiyoke portion 10 is formed around the motor output shaft 7 to prevent leakage of high frequency waves to the outside of the heating chamber 2. For this reason, the distance l ₁ between the saucer 4 and the motor 5 increases, which not only increases the height of the device body, but also increases the ratio of the accommodation dimension of the motor 5 to the height dimension of the device body, and the lower part of the device body Because the shape tends to be elongated, it was often difficult to design.

On the other hand, in a high-frequency heating device having an oven function, heat within the heating chamber is easily transmitted to the motor body via the motor output shaft. Therefore, if the heat resistance of the motor itself is improved or a heat insulating structure is applied, the cost will increase, and if the motor output shaft is lengthened, it becomes difficult to miniaturize the device.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks and provides a highly safe and inexpensive high-frequency heating device.

Composition of the Invention In order to achieve this object, the high frequency heating device of the present invention provides a highly safe and inexpensive high frequency heating device by forming the motor output shaft with a low dielectric material such as resin or ceramic. becomes.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, reference numeral 11 indicates a saucer for placing and rotating the object to be heated in the heating chamber, 12 a motor for rotating the saucer 11, 13 a motor output shaft made of a low dielectric material such as resin or ceramic, and 14 a This drive shaft is made of a low dielectric material and passes through the bottom wall surface 15 of the heating chamber and transmits the rotation of the motor output shaft 13 to the saucer 11. Reference numeral 16 denotes a roller section composed of a plurality of rollers and a roller support section, on which the tray 11 is placed and rotates as the tray 11 rotates.

According to this configuration, since the motor output shaft 13 is made of a low dielectric material, even if the motor output shaft 13 protrudes into the heating chamber or comes close to the drive shaft penetration part on the bottom wall of the heating chamber, the motor output shaft 13 This prevents high-frequency waves from being guided outside the heating chamber, and therefore eliminates the need for a conventional cheese yoke. Furthermore, since the conventional chiyoke part is no longer necessary, the distance _l2 between the saucer and the motor can be narrowed, which allows the device body to be made smaller and the design of the device body to be easier. Furthermore, since the motor output shaft 13 is made of a low dielectric material such as resin or ceramic material, its mechanical strength is lower than that of a metal material, but the saucer 11 is supported concentrically by the roller portion 16. Therefore, even if an unbalanced load or a drop impact force is applied to the receiving tray 11, the force applied to the motor output shaft 13 is alleviated, and it can be used practically without any problem.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Since the motor output shaft is made of a low dielectric material, high-frequency waves are not induced outside the heating chamber by the motor output shaft, and a highly safe turntable mechanism can be obtained even without a chiyoke part. It will be done.

(2) Since the chiyoke part is not required, the distance between the saucer and the motor can be narrowed, so the main body of the device can be downsized and an inexpensive high-frequency heating device can be provided.

(3) The thermal conductivity of the motor output shaft is significantly lower than that of metal materials, so even with high-frequency heating equipment that has an oven function, less heat is transferred to the motor body via the motor output shaft, resulting in poor heat resistance and insulation structure. This eliminates the need for an inexpensive and compact turntable mechanism.

(4) Even if unbalanced load or drop impact force is applied to the saucer,
Since the saucer is supported by the roller portion, the force applied to the motor output shaft is relaxed, and even if the motor output shaft is made of a low dielectric material, it can be used without any practical problems.

[Brief explanation of drawings]

Fig. 1 is a schematic side heat insulation diagram of a conventional high-frequency heating device, Fig. 2 is an enlarged side sectional view of the main part of the turntable section of the same high-frequency heating device, and Fig. 3 is an enlarged main part showing an embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 11... saucer, 12... motor, 13... motor output shaft, 14... drive shaft, 15... heating chamber bottom wall surface, 16... roller part.

Claims (1)

[Claims] 1. A heating chamber that stores and heats an object to be heated, a saucer on which the object to be heated is placed and rotates, a motor provided on the outside of the bottom surface of the heating chamber, a motor output shaft extending from the motor, a drive shaft that passes through the bottom wall of the heating chamber and transmits the rotation of the motor output shaft to the tray, the tray is placed on a roller section consisting of a plurality of rollers and a roller support section, and the motor output shaft A high-frequency heating device constructed of a low dielectric material such as resin or ceramic material.