JPH088058A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To simplify an antenna structure for cost reduction by forming an antenna ring into a flanged C-ring shape, engaging the ring in the groove of an antenna shaft, and holding the flanged portion in position by means of an antenna spacer. CONSTITUTION:A screw portion at the end of an antenna shaft 26 is inserted into a hole provided in part of an antenna 25, is held in position by a nut 30, and is anodic coated to prevent loosening of the nut 30. Next, the antenna shaft 26 is passed from below through a hole 36 that is as large as the outside diameter of an antenna ring 27 provided in part of an antenna spacer 34 and in a position opposite to the center of a motor shaft 32, and the antenna ring 27 is pushed open from above, inserted into the shaft 26, and held in the groove 29 of the shaft 26. Next, the antenna spacer 34 is raised to a flanged portion 33 of the top surface of the antenna ring 27. The flanged portion 33 is held in place inside an opening by being put on the antenna spacer 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supplying a high frequency to a heating chamber of a high frequency heating device.

[0002]

2. Description of the Related Art Heretofore, in this type of antenna type heating device, since the temperature of the antenna shaft is high, the resin material is often tetrafluoroethylene. However, the cost of the material itself of tetrafluoroethylene is high, and complicated processing is difficult. The configuration will be described below with reference to FIGS. 4 and 5.

As shown in FIG. 4, a waveguide 3 is mounted on an upper portion of a heating chamber 2 mounted on a main body 1, and a high frequency oscillator 4 for oscillating radio waves is mounted on a tip of the waveguide 3 on the machine room side. It is fixed. An antenna 5 and an antenna shaft 6 for sending radio waves to the heating cabinet 2 are attached to an opening portion at the tip of the waveguide 3 to which the high frequency oscillator 4 is fixed and which is connected to the heating cabinet 2. Hereinafter, description will be given with reference to FIG. 5 which is a detailed sectional view taken along the line BB.

As shown in FIG. 5, an antenna ring 7 having a ring shape made of a material of tetrafluoroethylene is fixed by a rivet 8 to an opening connecting the waveguide 3 and the heating chamber 2. The antenna ring 7 is vertically held between the portion of the collar 9 provided on the antenna shaft 6 and the antenna 5, and is smoothly rotated. The antenna shaft 6 and the antenna 5 are assembled by tightening the nut 10 at the tip of the antenna shaft 6. Furthermore, the antenna 5 and the antenna axis 6
The entire antenna 5 and antenna shaft 6 are anodized to prevent sparking due to burrs during processing. The tip end hole of the antenna shaft 6 attached as described above and the motor shaft 12 of the motor 11 attached to the upper waveguide are coupled so that the antenna 5 is rotated by driving the motor 11. Further, there is known a structure in which a top plate 13 is used for protection in order to prevent sparks and the like due to dirt from the outside.

[0005]

In such an antenna structure of the conventional high-frequency heating apparatus, the temperature of the antenna shaft 6 is considerably high, and therefore tetrafluoroethylene having a high heat resistance temperature is used as a material for the antenna ring 7. Although materials such as the above are generally used, they have the following problems.

(1) The size of the antenna ring is equal to that of the heating chamber 2.
Since a diameter larger than the size of the opening that connects the waveguide 3 and the waveguide 3 is required, the amount of use is large.

(2) The alumite treatment for preventing spark must be performed after the antenna 5 and the antenna shaft 6 are fixed by the nut 10 in order to completely electrically connect the antenna 5 and the antenna shaft 6, Therefore, antenna ring 7
Since it is processed in the state where it is incorporated in the antenna 5 and the antenna shaft 6, it is difficult for alumite to rotate on the contact surface between the antenna ring 7 and the antenna shaft 6, resulting in a non-uniform processing surface, producing abnormal noise, and scraping the contact surface. The life has been shortened.

The present invention is to solve the above-mentioned problems. In addition to simplifying the antenna mounting structure and reducing the size of the antenna ring 7 using an expensive material to reduce the cost,
It is intended to provide a highly reliable high frequency heating device.

[0009]

In order to achieve the above object, the present invention provides a waveguide mounted on an upper part of a heating chamber, a high frequency oscillator mounted on a tip of the waveguide on the machine room side, and the heating chamber. A motor for driving the antenna attached to the tip of the upper waveguide, an antenna shaft coupled to the motor shaft and an antenna fixed in a direction perpendicular to the tip of the antenna shaft are rotated by rotation of the motor shaft. The collar of the antenna ring mounted in the groove serves as a stopper and is supported by the antenna spacer so as not to fall downward. The antenna spacer is attached to the upper part of the heating chamber and the opening of the waveguide, and the antenna shaft is held vertically and parallel to the antenna by the D-cut portion of the motor shaft.

[0010]

According to the present invention, when the antenna ring for receiving the antenna shaft is inserted into the hole of the antenna spacer after the antenna ring for receiving the antenna shaft is inserted into the hole of the antenna spacer, the flange portion of the antenna ring serves as a downward stopper and the tip of the antenna shaft. By connecting the motor shaft with the D-cut, it is held parallel to the top and bottom. As a result, the size of the antenna ring that receives the antenna shaft can be made large enough to receive the circumference of the groove of the antenna shaft.

[0011]

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

As shown in FIG. 1, a waveguide 23 is mounted on an upper portion of a main body 21 in which a heating chamber 22 is mounted, and a high frequency oscillator 24 for oscillating radio waves is provided at a tip of the waveguide 23 on the machine room side.
Has been fixed. An antenna 25 and an antenna shaft 26 for sending radio waves to the heating chamber 22 are attached to an opening portion of the tip end of the waveguide 23 to which the high-frequency oscillator 24 is fixed and which is coupled to the heating chamber 22, so that contamination from the outside may occur. It is covered with a top plate 35 to prevent sparks and the like.

A detailed sectional view taken along the line AA will be described below. As shown in FIG. 2, the antenna portion is held in the opening connecting the waveguide 23 and the heating chamber 22. For the antenna 25 and the antenna shaft 26, a threaded portion at the tip of the antenna shaft 26 is inserted into a hole provided in a part of the antenna 25, fixed by a nut 30, and then anodized to prevent the nut 30 from loosening, so that a complete Can be anodized. Next, the motor shaft 32 provided in a part of the antenna spacer 34
The antenna shaft 26 is penetrated from the lower side into a hole 36 having a diameter equal to the outer diameter of the antenna ring 27 at a position facing the center of
The antenna ring 27 having a C-ring shape with a notch in a part is pushed open from the upper part and inserted into the antenna shaft 26 to be housed in the groove 29 of the antenna shaft 26. Next, the antenna spacer 34 is pulled up to the brim 33 part provided on the upper surface of the antenna ring 27. The flange 33 is fixed to the opening by the mounting hole 37 of the antenna spacer 34 in such a structure that it cannot be pulled out by riding on the antenna spacer 34. Next, the motor shaft 32 of the motor 31 attached to the waveguide 23 is inserted into the upper end hole of the antenna shaft 26. Since the motor shaft 32 rotates the antenna 25, they have D-cut shapes. The motor shaft 32
The D-cut portion of the antenna retains the tip portion of the antenna shaft 26. According to the above configuration, the antenna shaft 26 is held in parallel vertically by the collar 33 of the antenna ring 27 housed in the groove 29, the antenna spacer 34 mounted on the antenna ring 27, and the D-cut portion of the motor shaft 32.
It is understood that the size of the antenna ring 27 should be the diameter of the antenna shaft 26 plus the flange 33. Also, regarding the length, it is necessary to have a dimension such that the motor 31 does not come off during temporary fixing until it is attached, that is, a dimension slightly longer than the distance between the tip of the antenna shaft 26 and the upper surface of the waveguide 23 with the antenna attached. Good.

[0014]

As is apparent from the above description, the size of the antenna ring 27 using the expensive tetrafluoroethylene material can be reduced to one fourth or less, and the cost can be reduced. By implementing the present invention, the following effects can also be obtained.

(1) Since the shape of the antenna ring 27 is cylindrical, it is possible to perform cutting without using a mold.

(2) Alumite treatment is performed as a countermeasure against sparks, but since it is a unit consisting only of the antenna 25 and the antenna shaft 26, pretreatment before assembly is possible, and productivity is greatly improved and uniform alumite treatment is possible. As a result, the rotation is smooth, and it is possible to prevent the reduction of life and the occurrence of sparks due to the scraping of the shaft.

(3) It is not bulky because the antenna ring 27 and the antenna portion are in a single state. (4) Metal powder and the like can be eliminated before mounting, and the spark factor can be eliminated.

As described above, it is possible to provide a heating device which is practical and has a high cost merit.

[Brief description of drawings]

FIG. 1 is a front sectional view of a heating device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the heating device.

FIG. 3 is a configuration diagram of main parts of the heating device.

FIG. 4 is a front sectional view of a conventional heating device.

FIG. 5 is an enlarged sectional view of the heating device.

[Explanation of symbols]

 22 Heating Cabinet 23 Waveguide 25 Antenna 26 Antenna Axis 27 Antenna Ring 29 Antenna Axis Groove 31 Motor 32 Motor Axis 33 Tsuba 34 Antenna Spacer

Claims (1)

[Claims] 1. An antenna that rotates during operation, an antenna ring that rotatably supports a shaft portion of the antenna, and an antenna spacer for holding the antenna ring are provided in an opening of a waveguide coupled to a heating chamber. The antenna ring is fixed and has a C-ring shape having a collar portion, is mounted in a groove of the antenna shaft portion, holds and fixes the collar portion with an antenna spacer, and is sandwiched by the drive shaft of the motor. Therefore, a high frequency heating device having a structure for holding the antenna axis above and below.