JPS61294790A - 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 in which a rotating waveguide is installed in a heating chamber.

[Technical background of the invention and its problems]

Generally, in a high-frequency heating device such as a microwave oven, an excitation port is formed on the wall of a heating chamber, and high-frequency radio waves output from a high-frequency oscillator are passed through a waveguide attached to the outer wall of the heating chamber to the side of the excitation port. A stirrer fan is provided in the heating chamber, which is guided by the starvation fan 7 and introduced into the heating chamber through the excitation port, and is placed opposite to the excitation port of the heating chamber. A structure that stirs the introduced high-frequency radio waves is known.

However, with the conventional configuration described above, the high-frequency radio waves introduced into the heating chamber are not sufficiently stirred, which tends to cause uneven heating of the heated food stored in the heating chamber, and the finished state of the cooked food is not uniform. There was a problem that was difficult to solve. In addition, in the case of the star fan system, it is easy to spend time and money on selecting the shape of the blades, so there is a problem that the star fan design becomes complicated and the cost increases.

[Purpose of the invention]

This invention can sufficiently stir the high-frequency radio waves introduced into the heating chamber, eliminate uneven heating of the heated food stored in the heating chamber, and make the finished state of the cooked food uniform. It is possible to reduce
In addition, it is an object of the present invention to provide a high-frequency heating device that can reduce the size and weight of a rotating waveguide.

(Summary of the Invention) In the present invention, an excitation port is formed on a wall surface of a heating chamber, and high frequency waves output from a high frequency oscillator are guided to the excitation port side via a waveguide, and from the excitation port to the inside of the heating chamber. In the high-frequency heating device to be introduced, an opening surface is formed on the top surface side to introduce the high frequency wave guided from the excitation port of the heating chamber to the inside of the heating chamber, and a plurality of openings are combined on the bottom surface side. The heating chamber is characterized in that a substantially box-shaped rotating waveguide in which an excitation port is formed is rotatably provided within the heating chamber.

[Embodiments of the invention]

Hereinafter, one embodiment of this invention will be described in the 15th example! This will be explained with reference to FIGS. FIG. 1 schematically shows the overall structure of a high-frequency heating device such as a microwave oven, and 1 is a case of the main body of the high-frequency heating device, and 2 is a heating chamber installed in the case 1. The front of this heating chamber 2 is open,
This front opening can be opened and closed by a lever (not shown). Furthermore, a shelf 4 for placing the food to be heated 3 is installed inside the heating chamber 2, and the food to be heated 3 is placed on this placement 114. Further, an excitation port 5 is formed in the ceiling plate 2a of the heating chamber 2 at approximately the center thereof. This excitation port 5 is connected to a waveguide 6 disposed outside the heating chamber 2.
covered by the tip of the

Further, the waveguide 6 is fixed to the outer surface of the ceiling plate 2a of the heating chamber 2, and the base end side of the waveguide 6 extends to the side of the heating chamber 2. Furthermore, this waveguide 6
Magnet on the proximal side extension part.

A TRON (high frequency oscillator) 7 is attached.

The high frequency wave output from the magnetron 7 is guided to the excitation port 5 side via the waveguide 6, and introduced into the heating chamber 2 from the excitation port 5.

On the other hand, in the heating N2, a rotating waveguide 8 made of a conductive material such as aluminum is provided near the excitation port 5. The rotating waveguide 8 is attached to a rotating shaft 9a of a drive motor 9 attached to the tip of the waveguide 6, and is rotationally driven by the drive motor 9.

The rotating shaft 9a of the drive motor 9 is made of a heat-resistant dielectric material such as Teflon. Further, as shown in FIGS. 2 and 3, the rotating waveguide 8 is approximately box-shaped with an open top surface, and the rotating waveguide 8 has a rotating shaft with its top opening surface 10 facing upward. The rotary waveguide 8 is attached to the tip of the rotary waveguide 8 so that one end of the upper opening surface 10 faces the excitation port 5 of the heating chamber 2 . In this case, rotating waveguide! 8 is formed so that the entire area of the excitation port 5 of the heating chamber 2 always faces into the upper opening surface 10 regardless of the rotation angle. Furthermore, the rotating waveguide 8
An excitation port 11 for guiding the high-frequency radio waves in the rotating waveguide 8 to the inside of the heating chamber 2 is formed at the bottom of the rotary waveguide 8 at an end opposite to the end to which the rotating shaft 9a is fixed. This excitation port 11
is a combination of a pair of openings 12a and 12b. In this case, each opening 12a forming the excitation port 11
, 12t) are arranged sequentially along the traveling direction of high-frequency radio waves inside the rotating waveguide 8, and one opening 12a is perpendicular to the traveling direction of the high-frequency radio waves inside the rotating waveguide 8. At the same time, the other opening 12b is formed along the traveling direction of the high frequency radio waves inside the rotating waveguide 8.

These opening portions 12a, 121) are arranged perpendicular to each other, and one end of the opening portion 12t) is connected to the opening portion 12. It is combined in a state where it is connected to the approximately central part of a. Furthermore, among the openings 12a and 12b forming the excitation port 11 of the rotating waveguide 8, the opening 12a that is closer to the excitation port 5 of the heating chamber 2 is located at a position facing the excitation port 5 of the heating chamber 2. It is located away from the That is, as shown in FIG.
A predetermined gap is formed in a direction perpendicular to the axial direction of a. As shown by arrows in FIG. The high frequency radio waves inside are guided to the inside of the heating chamber 2 from the excitation port 11 at the bottom of the rotating waveguide 8.
As the rotating waveguide 8 rotates, the excitation port 11 moves into the heating chamber 2.
The high-frequency radio waves guided inward are radiated throughout the heating chamber 2 in a stirring state. Furthermore, a partition plate 13 made of a material with good radio wave transparency such as plastic is attached to the lower surface of the ceiling plate 2a of the heating chamber 2 on the outside of the rotating waveguide 8. The periphery of the rotating waveguide 8 is covered.

Therefore, in the above structure, a substantially box-shaped rotating waveguide 8 is provided in the heating chamber 2 so as to be rotatable by a drive motor 9, and an excitation port 11 formed at the bottom of the rotating waveguide 8 is provided. It is arranged at a position away from the position facing the excitation port 5 of the heating chamber 2, and rotates the high frequency radio waves guided from the excitation port 5 to the inside of the heating chamber 2 from the upper opening surface 10 side of the rotating waveguide 8. After being introduced into the waveguide 8, the high-frequency radio waves in the rotating waveguide 8 are guided into the heating chamber 2 from the excitation port 11 at the bottom of the rotating waveguide 8. As it rotates, the position of the excitation port 11 that emits high-frequency radio waves inside the heating chamber 2 can be rotated around the rotating shaft 9a of the drive motor 9, and the heated food 3 accommodated in the heating chamber 2 can be rotated around the circumference. Uniform heating can be achieved along the direction. Furthermore, a pair of openings 12a forming the excitation port 11 at the bottom of the rotating waveguide 8
.

12b are sequentially arranged along the traveling direction of high-frequency radio waves in the rotating waveguide 8, so that the direction along the radial direction of the rotating shaft 9a of the drive motor 9 in the food to be heated 3 housed in the heating chamber 2. It is also possible to make the heating state uniform.

Therefore, it is possible to equalize the heating state of the food to be heated 3 in the circumferential direction and the heating state of the food to be heated 3 in the radial direction. The high-frequency radio waves inside the heating chamber 2 can be sufficiently stirred, and uneven heating of the food to be heated 3 housed in the heating chamber 2 can be eliminated, thereby making it possible to uniformize the finished state of the cooked food. Furthermore, unlike in the case of the Stara fan method, there is no need to design components such as blades with relatively complex shapes, making the design easier and reducing design time. Also, the rotating waveguide 8 can be easily manufactured by press molding, and the overall cost can be reduced. In addition, there is no risk of a relatively large dead space being formed within the heating chamber 2 (near the four corners of the heating chamber 2) unlike in the case of the turntable method, and the entire interior of the heating chamber 2 can be used effectively. I can do it. Furthermore, one opening 12a of the openings 12a and 12b forming the excitation port 11 of the rotating waveguide 8 is formed perpendicular to the traveling direction of the high-frequency radio waves inside the rotating waveguide 8. At the same time, the other opening 12b is formed along the traveling direction of high-frequency radio waves inside the rotating waveguide 8, and since these openings 12a and 12b are arranged orthogonally to each other, the rotation High-frequency radio waves in various modes inside the waveguide 8 can be efficiently introduced into the heating N2 through the openings 12a and 12b. Therefore, energy loss due to poor excitation of high-frequency radio waves can be effectively prevented, the stirring state of high-frequency radio waves can be further improved, and cooking time can be shortened. Also,
Since the excitation port 11 is formed by combining a pair of openings 12a and 121) arranged perpendicularly to each other, the rotation waveguide 11 is formed by combining a pair of openings 12a and 121) that are arranged orthogonally to each other. The entire tube 8 can be made smaller and lighter. Therefore, the internal space of the heating chamber 2 can be used more effectively, and the drive motor 9 that rotationally drives the rotary waveguide 8 can be downsized, and the overall cost can be reduced.

Note that this invention is not limited to the above embodiments. For example, as in the second embodiment shown in FIG.
at least one pair of openings 23 arranged to intersect at
a, 23b are combined and formed, and these openings 23
a and 23b may be arranged in sequence in parallel along the rectilinear direction of high-frequency radio waves within the rotating waveguide 21, and even in this case, the embodiments shown in FIGS. 1 to 3 may be used. Almost the same effect can be obtained.

Further, as in the third embodiment shown in FIG. 5, the position farthest from the excitation port 5 of the heating chamber 2 (near the rotation axis 9a) in the rotating waveguide 31 formed in a box shape is Ill
The height of the wall 32 is set lower than the height of the side wall 33 at other positions, and the rotating waveguide 31 is placed on the top of the side wall 32.
or an excitation port of the heating chamber 2 in a rotating waveguide 31 formed in a box shape as in the fourth embodiment shown in FIG. 5
The side wall at the position farthest from the position is removed, and a part of the high-frequency radio waves within the rotating waveguide 31 is guided to this part. A configuration may be adopted in which a lead-out opening 35 is formed, and in these cases, the waveguide 31 is guided straight into the heating chamber 2 from the rotating waveguide 31 through the lead-out opening 34 (or the lead-out opening 35). A high-frequency radio wave component and an opening 378.37b of the excitation port 36 displaced by 90' with respect to the rectilinear direction of this high-frequency radio wave component.
The high-frequency radio wave components derived from the heating chamber 2 can be supplied, and the high-frequency radio waves in the heating chamber 2 can be stirred in an even better state.

Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

According to this invention, an opening surface is formed on the top surface side for introducing high frequency waves guided from the excitation port of the heating chamber into the inside of the heating chamber, and an excitation port that is a combination of a plurality of openings is formed on the bottom surface side. Since a roughly box-shaped rotating waveguide is rotatably installed in the heating chamber, the high-frequency radio waves introduced into the heating chamber are sufficiently stirred to move in the circumferential direction of the food to be heated stored in the heating chamber. It is possible to equalize the heating state of the food and the heating state of the heated food in the radial direction, thereby eliminating uneven heating of the food and making the finished state of the cooked food uniform, and at the same time reducing costs. In addition, the rotating waveguide can be made smaller and lighter.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of this invention.
Fig. 1 is a vertical cross-sectional view showing a schematic configuration of the entire high-frequency heating device, Fig. 2 is a longitudinal cross-sectional view of the main parts, Fig. 3 is a perspective view showing a rotating waveguide, and Fig. 4 is a second embodiment. FIG. 5 is a perspective view showing a rotating waveguide of the third embodiment,
FIG. 6 is a perspective view showing the rotating waveguide of the '4th embodiment. 2...Heating chamber, 5...Excitation port (of waveguide), 6...
・Waveguide, 7... Magnetron (high frequency oscillator), 8
゜21.31... Rotating waveguide, 10... Upper opening surface, 11.22.36... Excitation port (of rotating waveguide),
12a, 12b, 23a, 23b, 37a. 31)...Opening. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3

Claims (1)

[Claims] In a high-frequency heating device in which an excitation port is formed on a wall surface of a heating chamber, high frequency waves output from a high-frequency oscillator are guided to the excitation port side via a waveguide, and introduced into the heating chamber side from the excitation port, A substantially box in which an opening surface for introducing high frequency waves guided from an excitation port of the heating chamber to the inside of the heating chamber is formed on the top surface side, and an excitation port that is a combination of a plurality of openings is formed on the bottom surface side. A high-frequency heating device characterized in that a shaped rotating waveguide is rotatably provided within the heating chamber.