JPH0115108Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency cooking device (microwave oven), and more particularly to a high-frequency cooking device having an improved high-frequency radio wave supply port provided in a waveguide.

In the case of conventional high frequency heating cookers of this type,
Generally, oscillating microwave energy from a high-frequency oscillation power source, such as a magnetron, is supplied to the inside of the refrigerator from a power supply opening in the ceiling wall of the heating chamber (cooking chamber) through a waveguide. , A stirrer blade is installed in the ceiling of the heating chamber to stir the high-frequency radio waves so that the distribution of electric field strength is uniform without deflecting the microwave energy toward the food to be cooked, or a stirrer blade is installed at an appropriate place in the waveguide. There are some types of high-frequency cooking devices that use posts made of dielectric material to maintain a balanced electric field distribution, but these high-frequency cooking devices have drawbacks such as not only increasing the number of parts but also complicating the structure. It was hot.

In the process of making an opening in the ceiling wall of a heating chamber (cooking room) by press working, this invention involves punching out an opening in a U-shape with one side left uncut. By bending it to the side, it forms a reflector that accurately captures the high-frequency radio waves that reach the power supply port from the high-frequency oscillation power supply, and distributes them evenly over the food in the heating chamber so that they do not spread from the power supply port to others. The objective is to achieve a process suitable for mass production by using extremely simple and inexpensive processing means and by eliminating unnecessary appendages. The purpose of the present invention is to provide an inexpensive high-frequency heating cooker.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the main parts of the high-frequency heating cooker according to the present invention, with the outer shell removed and showing the basic structure. The back plate 4 attached to the rear part is a front frame, and an opening/closing door (not shown) is screwed to the front frame 4 so as to be openable and closable. 5 is a rectangular waveguide with a convex cross section provided on the ceiling wall 6 of the heating chamber 2, and 7 is a magnetron attached to one end of the waveguide 5.

FIG. 2 is an enlarged sectional view of the waveguide 5 attached to the ceiling wall 6 of the heating chamber by spot welding. A magnetron 7 is installed at the right end of the waveguide 5. Also, a post 8 is provided inside the left end of the waveguide 5 and protrudes from the ceiling surface, and the heating chamber ceiling wall 6 opposite to the post 8 has a post 8 as shown in FIGS. 3 and 4. , three directions of the heating chamber ceiling wall 6, that is, the left end in the longitudinal direction of the waveguide 5 at positions separated by a predetermined distance L from the center lines X-X' and Y-Y' of the post 8, respectively, and FIG. Rectangular cut and raised pieces 9, 9a, and 9b are formed by pressing at the left and right positions in the figure, respectively, and these pieces are further bent at an angle of about 45° toward the waveguide to form a reflecting plate. However, as mentioned above, the rectangular windows 10, 10a, 10b having the same shape as the reflector are located at the position of the reflector formed by cutting and bending with a press.
has been opened, and this window 10, 10a, 10
b becomes the power feeding opening.

As described above, in the present invention, the oscillated radio waves from the oscillating part (antenna) 11 of a magnetron, etc., which is a high-frequency oscillating power source, are transmitted in the longitudinal direction within the waveguide, from the right end to the left in the figure, and are rectified by the post. , reaches a reflector set up at an angle of 45 degrees in three directions,
It bends approximately 90 degrees and supplies high-frequency radio wave energy to the food in the heating chamber from the power supply opening to heat it.A cut and raised piece of approximately the same size is pressed on a part of the ceiling wall of the heating chamber. It is formed by processing and bent at an angle of approximately 45 degrees to form the reflector plate integrally with the ceiling wall of the heating chamber, which eliminates the need for unnecessary materials and saves on materials. Not only is it possible to do this, but compared to installing a reflector made of a separate material, the work process can be omitted, reducing labor costs.Furthermore, the simplified structure makes it suitable for mass production and can be produced at low cost. It has many practical values such as being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of the high-frequency heating device according to the present invention, Fig. 2 is a cross-sectional view showing the high-frequency supply port, Fig. 3 is a cross-sectional view taken along the - line in Fig. 2, and Fig. 4 is a cross-sectional view of the high-frequency supply port. Explanatory plan view.

Claims (1)

[Scope of claim for utility model registration] (1) High-frequency heating cooking in which high-frequency radio waves generated by a high-frequency oscillation power source are introduced into the heating chamber through a power supply opening formed in the ceiling wall of the heating chamber through a waveguide. In the high frequency device, a plurality of reflecting plates are cut and raised on the ceiling wall of the heating chamber located at the end of the waveguide and are tilted at an appropriate angle toward the waveguide side, and the same number of feeding openings are provided. Heating cooker. (2) A reflector plate is installed to introduce the high-frequency radio waves generated by the high-frequency oscillation power supply into the heating chamber through the power supply opening formed in the ceiling wall of the heating chamber located at the end of the waveguide. The high-frequency heating cooker according to claim 1, which is formed with a suitable angle of inclination only at a position that does not obstruct introduction.