JPS622493A - 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 a high-frequency heating device, and particularly relates to an improvement of a high-frequency heating device in which a power supply stirring means such as a rotating waveguide is provided in a heating chamber.

[Technical background of the invention and its problems]

In a microwave oven (high frequency heating device), a rotating waveguide (power feeding stirring means) is installed in the heating chamber, and microwaves (high frequency) are irradiated into the heating chamber from the rotating rotating waveguide to cook food. There are devices that heat things (things to be heated).

By the way, in the drive structure of such a rotating waveguide, conventionally,
The structure shown in FIGS. 3 and 4 is used.

That is, the part directly above the excitation port C on the upper surface of the waveguide installed on the outer surface of the wall of the heating chamber A is set as the driven device installation section, and the driven device installation section is driven. A structure is adopted in which a device, for example, an electric motor d is installed, and a rotary waveguide f is connected to the tip of a shaft e of the electric motor d that projects into a heating chamber a. This structure allows the microwaves emitted from the excitation port C to be rotated into a rotating waveguide! It was designed to irradiate the inside of the heating 'Ja from f.

By the way, in such a microwave oven, the height of the main part is defined as the height of the heating chamber a plus the height of the waveguide and the electric motor d, and the size of the surrounding cabinet Q is determined from this. , the overall height is H. However, as mentioned above, in a structure in which the electric motor d is simply installed on the top of the waveguide, the height of the electric motor d directly influences the height of the cabinet q, resulting in a large height increase. There are circumstances that necessitate the use of cabinets L-Q. For this reason, there is a problem in that it is not possible to make the outer shape of the entire microwave oven compact, even though miniaturization is desired these days. Moreover, the cabinet q is affected by the electric motor d, which increases the ^, which increases the material cost, and the electric motor d
As a result, the vibration of the rotating waveguide increases as the rotating waveguide rotates, causing trouble due to contact (
There was a risk of abnormal noise (e.g., deformation of the single-rotation waveguide).

[Purpose of the invention]

This invention was made with attention to these problems, and its purpose is to make the external size of the heating chamber more compact while maintaining the same volume, and to shorten the shaft length of the drive device. The object of the present invention is to provide a high-frequency heating device that can perform high-frequency heating.

[Summary of the Invention] That is, the present invention forms a step on the upper surface of the waveguide at the driven device installation portion where the driving device is installed, thereby allowing the driving device to enter the waveguide and heat the waveguide. The objective is to shorten the distance from the outer surface of the wall of the chamber to the end of the drive device.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in FIGS. 1 and 2. FIG. 2 shows a high-frequency heating device to which the present invention is applied, for example a microwave oven, where 1 is a cabinet, 2 is a heating chamber disposed within the cabinet 1,
3 is an excitation opening provided in the upper wall of the heating chamber 2; 4 is a waveguide with a magnetron 5 connected to the entrance side; 4 is a waveguide with a magnetron 5 connected to the inlet side; 6 is a drive device; It is an electric motor. A waveguide 4 is installed on the outer surface of the upper wall of the heating chamber 2, and the exit side of the waveguide 4 is connected to the excitation opening 3, and the microwave (high frequency) oscillated from the magnetron 5 is transmitted through the excitation opening. I am trying to lead to 3. Further, as shown in FIG. 1, a stepped portion 7 is formed in the driven device installation portion disposed directly above the excitation port 3 by molding that portion lower by the dimension.

The electric motor 6 is installed on this lower driven device installation part, and the shaft 6a of the electric motor 6 extends to just below the excitation port 3. The waveguide 4 is a rotating waveguide constructed in the shape of a rectangular vessel from a conductive member that has been formed into a predetermined shape including the stepped portion 7 by integral drawing or bending. Note that 8a is a rotating waveguide 8
This is an excitation opening provided on the bottom wall of the pump, at one end that is eccentric from the center. The rotary waveguide 8 is arranged on the upper side of the heating chamber 2 so that its opening faces the excitation opening 3, and the other end of its bottom wall is connected to the electric motor 6 using a fixing screw 10. It is fixed to the tip of the shaft, and can be rotated eccentrically using an electric motor 6 as a driving source. however,
Needless to say, the opening of the rotating waveguide 6 is large enough to accommodate the entire heating side excitation opening 3.

In addition, in FIG. 2, reference numeral 11 is made of a material that is transparent to radio waves, such as heat-resistant resin, and is provided so as to cover the periphery of the rotating waveguide 8 to protect the rotating waveguide. It is a partition plate.

Next, the operation of the microwave oven configured as described above will be explained. Now, there are 12 things to be cooked (things to be heated) in the heating chamber 2.
and operates the operating section of the microwave oven (not shown).

As a result, the electric motor 6 is activated and the rotating waveguide 8 is rotated. On the other hand, as the operation unit is operated, the magnetron 5
Microwaves are oscillated from the Then, the oscillated microwave is transmitted to the waveguide 4. A rotating waveguide that is guided through the excitation aperture 3 to the rotating waveguide 8 and rotates around the shaft 6a! ! 8(
lJffi08a, 6mm'M, 21. :pH8n6
゜: That is, the microwave is fed into the heating chamber 2 while stirring, and the food 12 to be cooked is thereby heated.

Here, in the conventional structure in which the electric motor 6 is installed on the top surface of the waveguide N4, the length of the cabinet 1 is large, and it is difficult to make the external shape of the microwave oven compact.
be pointed out.

However, according to the present invention, the stepped portion 7 is formed in the portion where the electric motor 6 is installed, that is, the driven device installation portion. This means that the waveguide 4 is allowed a dimension that allows the electric motor 6 to be at a lower position with respect to the top surface of the waveguide 4, and the drive motor 6 is moved from the outer surface of the upper wall of the heating chamber 2. This will shorten the distance to the end. Thereby, the height dimension of the cabinet 1 can be reduced by the dimension. Specifically, if the height of the cabinet 1 (indicated by a single point Im) required to accommodate the height of the conventional waveguide 4 and the height of the electric motor 6 is defined as H dimension, Due to the lower dimensions of the electric motor 6,
It becomes possible to make the cabinet 1 smaller by that dimension. In other words, the height of the cabinet 1 that constitutes the outer shape of the microwave oven is only rH-AJ.

Therefore, the external shape of the microwave oven can be made compact while keeping the volume of the heating chamber 2 unchanged. Furthermore, since the cabinet 1 is small, the amount of materials and the like can be reduced accordingly, so the cost can be reduced. Also, the stepped portion 7
As the installation position of the electric motor 6 is lowered, the length of the shaft 6a of the electric motor 6 can be shortened, which reduces the vibration of the rotating waveguide 8 when it rotates. It is possible to prevent the tube 8 from coming into contact with the wall surface of the heating chamber 2, eliminate the generation of abnormal noise due to contact, and also eliminate deformation of the rotating waveguide 8 due to contact, so that microwave irradiation can always be performed with good performance. It brings about the effect that can be achieved.

Although a rotating waveguide was used as the power supply stirring means, it is also possible to use parts other than the rotating waveguide to stir microwaves.
The microwave emitted from the excitation port may be stirred. It goes without saying that the above-mentioned single stage driven by wind power can also be applied. In addition,
In this case as well, the wind rotary blade is installed at the driven device installation portion of the waveguide.

〔Effect of the invention〕

As described above, according to the present invention, the distance from the outer surface of the wall of the heating chamber to the end of the driving device can be shortened by allowing the driving device to fit into the waveguide.

As a result, the overall external shape of the A-frequency heating device can be made compact while keeping the volume of the heating chamber unchanged. Furthermore, being compact means that the amount of materials and the like can be reduced accordingly, so costs can be reduced. In addition, since the distance from the outer surface of the heating chamber wall to the end of the drive device is shortened, the length of the drive device can be shortened accordingly, which may cause abnormal noise and deformation of the power supply stirring means. This has the advantage of being able to reduce vibrations during rotation of the power supply stirring means, which can cause problems.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show one embodiment of the present invention.
The figure is a front sectional view showing the structure around the waveguide where the drive device is installed, Figure 2 is a front sectional view showing a high frequency heating device, Figure 3 is a front sectional view showing a conventional ^frequency heating device, and Figure 4 is a front sectional view showing the structure around the waveguide where the driving device is installed. The figure is a front sectional view showing the structure around the waveguide in which the drive device is installed. 1... Cabinet, 2... Heating chamber, 4... Waveguide, Applicant's agent Patent attorney Static pressure Takehiko Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A high frequency waveguide is installed on the outer surface of a wall of a heating chamber, a power supply stirring means is provided inside the heating chamber, and a driving device for driving the power supply stirring means is installed on the upper surface of the waveguide. A high-frequency heating device characterized in that a stepped portion is formed in a driven device installation portion of the waveguide.