JP3517825B2 - High frequency heating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device which is provided with a power feeding surface on the bottom of a heating chamber and radiates a high frequency wave from the lower part of an object to be heated to heat it with high efficiency.

[0002]

2. Description of the Related Art FIG . 7 is a longitudinal sectional view showing a high frequency heating apparatus of a first conventional example disclosed in, for example, Japanese Unexamined Patent Publication No. 8-321376.

In FIG . 7 , 1 is an object to be heated, 2 is a heating chamber, 3 is a high frequency generator which is a source of high frequency, 4 is a physical quantity detecting means for detecting the physical quantity of the object to be heated 1, a weight sensor, There are electric field probe sensors and the like. Reference numeral 5 is a control unit for controlling the high frequency generator 3 based on the detection result of the physical quantity detecting means 4, 6 is a waveguide for sending high frequency 7 from the high frequency generator 3 to the heating chamber 2, and 8 is waveguide 6 and heating. A power supply surface at the boundary of the chamber 2, 9 is a turntable, 11 is a motor for rotating the turntable 9, and 12 is an installation table which is supported by the turntable 9 and on which the object to be heated 1 is installed.

In the high-frequency heating apparatus of the first conventional example, the high-frequency wave 7 generated by the high-frequency generator 3 propagates through the waveguide 6 and propagates from the upper and lower two feeding surfaces 8 to the heating chamber 2.
While repeating incidence and reflection on the inner wall surface of the heating chamber 2, the object to be heated 1 placed on the installation table 12 on the rotating turntable 9 is irradiated. As a result, the article to be heated 1 is heated.

As described above, in the above-mentioned first conventional example, the waveguide 6 is installed on the side surface of the heating chamber 2, and the power feeding surface 8 is provided.
Since the distance between the heating object 1 and
The high frequency wave 7 that has entered the heating chamber 2 from is not directly absorbed by the object to be heated 1 but is absorbed by the object to be heated 1 after being repeatedly reflected and reflected by the inner wall surface of the heating chamber 2. Therefore, there is a drawback that energy loss occurs.

Further, since a high frequency wave is incident from the side surface of the heating chamber 2, the side surface and the upper surface of the object to be heated 1 are easily heated, and the lower surface and the central portion are hard to be heated, resulting in uneven heating.

Therefore, for example, a high-frequency heating device disclosed in Japanese Patent Application Laid-Open No. 9-210372 has been proposed in which the temperature of the central portion of the lower surface of the object to be heated can be increased. FIG. 8 is a longitudinal sectional view showing a second conventional example of a high-frequency heating device disclosed in the publication, in which the same reference numerals are given to parts corresponding to those of the above-mentioned first conventional example ( FIG. 7 ) . The description is omitted.

In the high-frequency heating device of the second conventional example, the feeding surface 8 which is the boundary between the heating chamber 2 and the waveguide 6 is provided on the bottom surface of the heating chamber 2. Reference numeral 21 is a roller that supports the peripheral portion of the turntable 9 below and rotates the roller, 22 is a rotary plate that rotates the roller 21, 23 is a rotary plate support roller that supports and rotates the rotary plate 22, and 24 is a rotary plate. Plate support roller 2
3 is a drive unit for driving the drive unit 3.

In the second conventional high frequency heating apparatus, the rotary plate 22 is rotated by rotating the rotary plate supporting roller 23 by the drive unit 24, and the roller 21 is rotated by rotating the rotary plate 22. The turntable 9 rotates. As described above, by disposing the mechanism for rotating the turntable 9 substantially on the circumference along the outer edge of the turntable 9, the power feeding surface 8 can be installed on the lower surface. Thereby, the high frequency wave 7 generated from the high frequency wave generator 3 propagates from the center of the bottom surface of the heating chamber 2 into the heating chamber 2. Therefore, the object to be heated 1
It is possible to sufficiently raise the temperature of the central portion of the lower surface of the.

Similarly, as the one in which the power feeding surface is arranged on the bottom side of the heating chamber, for example, the one disclosed in JP-A-8-321378 can be cited. FIG. 9 is a longitudinal sectional view showing a third conventional example of a high frequency heating apparatus disclosed in the publication, in which the same reference numerals are given to the portions corresponding to those of the above-mentioned first conventional example ( FIG. 7 ) . The description is omitted.

In the high frequency heating apparatus of the third conventional example, a power feeding chamber 31 is provided on one side of the bottom surface of the heating chamber 2, and a rotary antenna 32 is placed in the power feeding chamber 31. Reference numeral 33 is a first motor that drives the rotary antenna 32, 34 is a second motor that drives the turntable 9, and 35 is a control unit that controls the high-frequency generator 3, the first motor 33, and the second motor 34.

In the high frequency heating apparatus of the third conventional example, the high frequency generated by the high frequency generator 3 is introduced from the bottom of the heating chamber 2 into the heating chamber 2 through the waveguide 6 and the rotary antenna 32 in the feeding chamber 31. Propagate to. At this time, the weight sensor or the temperature sensor (not shown) detects the state of the object to be heated 1, and the rotary antenna 32 is driven by the first motor 33 according to the detected state of the object to be heated 1 to direct the directivity of the high frequency. Have control. Therefore, it becomes possible to make the heating distribution uniform.

Similarly, as an example in which the power feeding surface is arranged on the bottom side of the heating chamber, for example, the one disclosed in Japanese Patent Laid-Open No. 9-22775 can be mentioned. FIG. 10 is a vertical cross-sectional view showing a fourth conventional example of a high frequency heating apparatus disclosed in the publication, in which the same reference numerals are given to the portions corresponding to those of the above-mentioned first conventional example ( FIG. 7 ) . The description is omitted.

In the high-frequency heating apparatus of the fourth conventional example, in order to expand the effective use space and improve the cleanability and operability, a turntable is not installed in the heating chamber 2 and the heating chamber 2 and the waveguide are guided. A feeding surface 8 which is a boundary of the tube 6 is provided on the bottom surface of the heating chamber 2. Reference numeral 41 is a dielectric plate on which the article to be heated 1 is placed, 42 is a moving body made of a conductive member for changing the length of the waveguide 6, 43 is a motor for reciprocating the moving body 42, and 44 is a waveguide. A power supply unit that connects the tube 6 and the heating chamber 2 and is composed of a plurality of openings.

In the high frequency heating apparatus of the fourth conventional example, the high frequency generated by the high frequency generator 3 propagates through the waveguide 6 into the heating chamber 2 through the plurality of openings 44. At this time, the moving body 42 that defines the length of the waveguide 6 is set to the motor 4
The object 1 to be heated can be heated from the lower surface with various electric field distributions by performing reciprocating motion at 3.

[0016]

However, in each of the above-mentioned first to third conventional examples, since the turntable 9 is installed in the heating chamber 2, the following problems occur. Existed. (1) The structure for rotating the turntable 9 is complicated, the number of parts increases, the failure rate increases accordingly, and the radio wave shield mechanism becomes difficult, resulting in poor reliability. (2) The effective use space in the heating chamber 2 is reduced, and the cleanability is deteriorated. (3)
Due to the rotation of the turntable 9, the position and orientation of the object 1 to be heated are changed, making it difficult to take out the object 1 and the operability is poor.

Further, in the above-mentioned first and third conventional examples, the center of the bottom surface of the heating chamber 2 does not have a power feeding surface, so that the center of the object to be heated 1 cannot be heated with high efficiency. There were difficulties.

Further, in the above-mentioned fourth conventional example, since the power feeding portion is composed of the plurality of openings 44, it is not possible to intensively heat only the central portion, and it is vertically elongated. There is a problem that the object to be heated cannot be heated with high efficiency.

A technical object of the present invention is to enlarge the effective space of the heating chamber, improve the cleanability and operability, and heat the object to be heated with high efficiency.

[0020]

A high frequency heating apparatus according to claim 1 of the present invention is provided with a heating chamber for accommodating an object to be heated, a high frequency generator for generating a high frequency, and a lower part of the heating chamber.
A waveguide that transmits high-frequency waves generated from a high-frequency generator to the heating chamber, and is provided at the boundary between the waveguide and the substantially central part of the lower part of the heating chamber, and has the same width as the waveguide up to this point or it It is equipped with a power supply surface that is set wider than that of the above, and an installation table that is made of a low dielectric constant material and that is provided on the power supply surface and that installs an object to be heated. A slot opening / closing means which is formed of a circular power feeding surface or a polygonal power feeding surface and an arc-shaped slot power feeding surface provided around it, and which opens / closes the arc-shaped slot power feeding surface, and slot opening / closing means based on the detection result of the physical quantity detecting means. Slot opening / closing control means for driving and controlling the.

According to a second aspect of the present invention, in the high frequency heating device, a movable stirrer made of a conductor that randomly reflects high frequencies in multiple directions is provided below the power feeding surface in the waveguide, and the physical quantity detecting means is provided. The stirrer drive control means for controlling the drive of the stirrer on the basis of the detection result of 1) is provided.

Further, a high frequency heating apparatus according to a third aspect of the present invention is provided with a high frequency receiving body for receiving a high frequency and strengthening an electric field below the power feeding surface in the waveguide.

Further, in the high frequency heating apparatus according to the fourth aspect of the present invention, the high frequency receiver is attached to the movable mechanism, and
High-frequency receiver position control means for driving the movable mechanism based on the detection result of the physical quantity detection means to control the position of the high-frequency receiver is provided.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Hereinafter, the present invention will be described with reference to the illustrated embodiments. Figure 1 is a book
The power feeding surface portion of the high-frequency heating device according to claim 1 of the invention is expanded.
FIG. 1 (a) is a schematic plan view showing an arc-shaped slot feeding surface.
Figure 1 (b) shows the arc slot feed
Figure showing the state where the electric surface is fully closed. Figure 2 shows the slot opening and closing.
FIG. 3 is a plan view showing the plate, and FIG.
FIG. 2 is a vertical cross-sectional view showing the overall configuration of the device, in which the above-mentioned first
The parts corresponding to those of the conventional example ( FIG. 7 ) are designated by the same reference numerals and the description thereof is omitted.

In the high frequency heating apparatus according to the first embodiment , the power feeding surface is a circular power feeding surface (or polygonal power feeding surface) 8C centered on a substantially central portion of the bottom surface of the heating chamber 2 and four peripheral portions (90).
And a slot opening / closing means 50 for opening / closing each arc-shaped slot feeding surface 8D, and driving control of the slot opening / closing means 50 based on the detection result of the physical quantity detecting means 4. Control means 5A to which a slot opening / closing control function is added.

More specifically, the slot opening / closing means 50 is composed of a ring-shaped slot opening / closing plate 51 arranged below the power feeding surface and a drive mechanism 52 for rotating the slot opening / closing plate 51. ing.

As shown in FIG. 2 , the slot opening / closing plate 51 is formed of a ring-shaped plate, and its central hole 51a has the same shape and size as the circular power feeding surface (or polygonal portion) 8C. Further, arc-shaped holes 51b having the same shape and size as the slot power feeding surface 8D are formed at four positions in the circumferential direction of the slot opening / closing plate 51, and each arc-shaped slot power feeding surface 8D is formed by each arc-shaped hole 51b. It can be opened at the same time, and each surface portion 51c between each arcuate hole 51b.
Thus, the arc-shaped slot feeding surfaces 8D can be closed at the same time. Further, a sector gear 51d is formed on a part of the outer circumference of the slot opening / closing plate 51 and meshes with a pinion 54 attached to the output shaft of the motor 53 of the drive mechanism 52.

In the high frequency heating apparatus of the first embodiment , the slot 53 is reciprocally rotated by reciprocally rotating the pinion 54 by the motor 53. That is, when there is an object to be heated having a wide bottom surface or a plurality of objects to be heated depending on the shape and number of the objects to be heated detected by the physical quantity detecting means 4, as shown in FIG. Fully open 8D. As a result, the high frequency generated by the high frequency generator 3 and propagating through the waveguide 6 below the heating chamber 2 is
From the central hole 51a and each arcuate hole 51b of the slot opening / closing plate 51, a circular power feeding surface (or polygonal power feeding surface) 8C and each arcuate slot power feeding surface 8 formed in the lower center of the bottom surface of the heating chamber 2.
It enters D, propagates to the heating chamber 2 from the circular power feeding surface (or polygonal power feeding surface) 8C and each arcuate slot power feeding surface 8D, and directly irradiates the central portion of the lower surface of the object to be heated placed on the installation table 12. . When there is only one object to be heated such as milk and liquor, the slot opening / closing plate 51 is rotated by 45 degrees by the drive mechanism 52, and each arc portion is formed by the respective surface portions 51c of the slot opening / closing plate 51 as shown in FIG. 1 (b). The slot feeding surface 8D is closed, and the high frequency is circular feeding surface (or polygonal feeding surface) at the center.
Directly irradiate the central portion of the lower surface of the object to be heated only from 8C. Therefore, most of the high-frequency energy is directly applied to the object to be heated and is absorbed in the object to be heated with high efficiency. Therefore, the object to be heated can be heated with high efficiency, and energy loss can be significantly reduced.

As described above, also in the high frequency heating apparatus according to the first embodiment , the turntable can be eliminated and the object to be heated can be heated uniformly without rotating. Further, by eliminating the need for a turntable, the device cost can be reduced, the effective space for accommodating the object to be heated can be increased, and the cleanability and operability can be improved.

Further, since each arcuate slot power feeding surface 8D is openable / closable, it is possible to heat the object to be heated with a highly efficient and optimal opening pattern for the position, size, kind, etc. of the object to be heated.

Embodiment 2. FIG. 4 is a longitudinal sectional view showing a high-frequency heating device according to claims 1 and 2 of the present invention. In the figure, the first embodiment ( FIG. 3 ) described above is shown.
The same functional parts as those in FIG.

The high-frequency heating apparatus of the second embodiment drives a movable stirrer 61 composed of a conductor for randomly reflecting high-frequency waves in multiple directions below the feeding surface 8 in the waveguide 6 and the stirrer 61. And a motor 62 for controlling the stirrer 61 based on the detection result of the physical quantity detection means 4 and a stirrer drive control function is added to the control means 5B.
Is provided.

In the high frequency heating apparatus according to the second embodiment , the motor 62 rotates the stirrer 61 arranged at the lower center of the bottom surface of the heating chamber 2. As a result, the high frequency generated by the high frequency generator 3 and propagating through the waveguide 6 below the heating chamber 2 is reflected in multiple directions by the stirrer 61, and is heated from the feeding surface 8 in the substantially central portion of the bottom surface of the heating chamber 2. It propagates to the chamber 2 and irradiates the object to be heated 1 placed on the installation table 12 directly and randomly. Therefore, when heating an object to be heated with a wide bottom surface or a plurality of objects to be heated, the object to be heated is highly efficient,
Moreover, it is possible to suppress uneven heating and heat. As described above, most of the high frequency energy is directly applied to the object to be heated 1 and is absorbed in the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and energy loss can be significantly reduced.

As described above, also in the high frequency heating apparatus of the second embodiment , the turntable can be eliminated and the object to be heated can be heated uniformly without rotating. Further, by eliminating the need for a turntable, the device cost can be reduced, the effective space for accommodating the object to be heated can be increased, and the cleanability and operability can be improved.

Embodiment 3. FIG. 5 is a vertical cross-sectional view showing a high-frequency heating device according to claims 1 and 3 of the present invention. In the drawing, the above-described first embodiment ( FIG. 3 ) is shown.
The same functional parts as those in FIG.

In the high frequency heating apparatus of the third embodiment, a high frequency wave having a length of ¼ or more of a wavelength for receiving high frequency waves and strengthening the electric field is set below the feeding surface 8 in the waveguide 6. The receiver 71 is provided.

In the high frequency heating apparatus according to the third embodiment , the high frequency generated by the high frequency generator 3 propagates through the waveguide 6 below the heating chamber 2 and the power feeding surface 8 at the substantially central portion of the bottom surface of the heating chamber 2. It is further propagated to the heating chamber 2 and is directly irradiated on the bottom surface of the object to be heated 1 placed on the installation table 12. At this time, the high frequency wave propagating through the waveguide 6 is once received by the high frequency wave receiver 71. Therefore, a strong electric field region C around the high frequency receiver 71.
Occurs, and the irradiation efficiency on the bottom surface of the article to be heated 1 is improved.
Therefore, most of the high-frequency energy is directly the object to be heated 1.
And is absorbed by the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and energy loss can be significantly reduced.

As described above, also in the high frequency heating apparatus according to the third embodiment , the turntable can be eliminated and the object to be heated can be heated uniformly without rotating. Further, by eliminating the need for a turntable, the device cost can be reduced, the effective space for accommodating the object to be heated can be increased, and the cleanability and operability can be improved.

Embodiment 4. FIG. 6 is a longitudinal sectional view showing a high-frequency heating device according to claims 1, 3, and 4 of the present invention. In the drawing, the aforementioned fifth embodiment ( FIG.
The same functional parts as those in 5 ) are designated by the same reference numerals, and the description thereof will be omitted.

The high frequency heating apparatus of the fourth embodiment is set below the feeding surface 8 in the waveguide 6 by setting the length to be ¼ or more of the wavelength for receiving high frequency and strengthening the electric field. The high frequency receiver 71 is attached to the horizontal rotary plate 72 so that the rotary plate 72 can be driven by the motor 73, and the rotary plate 72 is detected based on the detection result of the physical quantity detection means 4.
The control means 5C is provided with a high-frequency receiver drive control function for driving and controlling the position of the high-frequency receiver 71.

In the high frequency heating apparatus according to the fourth embodiment , by rotating the rotary plate 72 by the motor 73 to change the position of the high frequency receiving body 71, the place for receiving the high frequency can be arbitrarily designated, and the arbitrary heating can be performed. Can be distributed. As a result, with high efficiency with respect to any object 1 to be heated,
Moreover, it is possible to suppress uneven heating and heat. That is, the object 1 to be heated can be directly irradiated with high-frequency energy with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and energy loss can be significantly reduced.

Also, in the high frequency heating apparatus of the fourth embodiment , the turntable can be dispensed with, and the object to be heated can be heated uniformly without rotating. Further, by eliminating the need for a turntable, the device cost can be reduced, the effective space for accommodating the object to be heated can be increased, and the cleanability and operability can be improved.

[0043]

As described above , according to the first aspect of the invention, the power feeding surface is provided around the circular feeding surface or polygonal feeding surface centered on the substantially central portion of the bottom surface of the heating chamber, and around it. Since it is formed of an arc-shaped slot power supply surface and provided with slot opening / closing means for opening / closing the arc-shaped slot power supply surface and slot opening / closing control means for drivingly controlling the slot opening / closing means based on the detection result of the physical quantity detection means, the heating target It is possible to heat with an optimal opening pattern with high efficiency for the position, size, type, etc. of the object. In addition, the high frequency energy from the lower waveguide is efficiently fed into the heating chamber from the lower waveguide by the power feeding surface formed in a circular or polygonal shape centered on the center of the bottom of the heating chamber. Can be propagated. Further, the turntable can be eliminated, the device cost can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the second aspect of the invention, a movable stirrer made of a conductor that randomly reflects high frequencies in multiple directions is provided below the feeding surface in the waveguide, and the detection result of the physical quantity detection means is provided. Since the stirrer drive control means for driving and controlling the stirrer based on the stirrer is provided, the high frequency waves propagating through the waveguide in the lower part of the heating chamber are reflected in multiple directions by the stirrer, and are fed from the feeding surface in the center of the bottom of the heating chamber. It is possible to propagate the light to the heating chamber and directly irradiate the object to be heated placed on the installation table at random. Therefore, when heating an object to be heated having a wide bottom surface or a plurality of objects to be heated, it is possible to heat the object to be heated with high efficiency and suppressing uneven heating. As described above, most of the high frequency energy is directly applied to the object to be heated and is absorbed in the object to be heated with high efficiency. Therefore, the object to be heated can be heated with high efficiency, and energy loss can be significantly reduced. Further, the turntable can be eliminated, the device cost can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the third aspect of the invention, since the high-frequency receiver for receiving high-frequency waves and strengthening the electric field is provided below the feeding surface in the waveguide, a strong electric field region around the high-frequency receiver is generated. The irradiation efficiency on the bottom surface of the object to be heated is improved. Therefore, most of the high frequency energy is directly applied to the object to be heated and is absorbed in the object to be heated with high efficiency. Therefore, the object to be heated can be heated with high efficiency, and energy loss can be significantly reduced. Further, the turntable can be eliminated, the device cost can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the fourth aspect of the present invention, the high frequency receiver is attached to the movable mechanism, and the movable mechanism is driven based on the detection result of the physical quantity detecting means to control the position of the high frequency receiver. Since the position control means is provided, it is possible to arbitrarily specify the place where the high frequency is received, and it is possible to set an arbitrary heating distribution. Therefore, it is possible to heat any object to be heated with high efficiency and suppressing uneven heating. Further, the object to be heated can be directly irradiated with high-frequency energy with high efficiency, the object to be heated can be heated with high efficiency, and energy loss can be significantly reduced. Further, the turntable can be eliminated, the device cost can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged plan view showing a power feeding surface portion of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a slot opening / closing plate of the high-frequency heating device according to the first embodiment .

FIG. 3 is a vertical cross-sectional view showing the overall configuration of the high-frequency heating device according to the first embodiment .

FIG. 4 is a vertical sectional view of a high-frequency heating device according to a second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a high-frequency heating device according to a third embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a high frequency heating device according to a fourth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing a high-frequency heating device of a first conventional example.

FIG. 8 is a vertical cross-sectional view showing a high-frequency heating device of a second conventional example.

FIG. 9 is a vertical cross-sectional view showing a high-frequency heating device of a third conventional example.

FIG. 10 is a vertical cross-sectional view showing a high-frequency heating device of a fourth conventional example.

[Explanation of symbols]

1 object to be heated, 2 heating chamber, 3 high frequency generator, 5A
Control means (slot switching control means) 5B control means (Stara drive control means), 5C controller (high-frequency receiving member position controlling means), 6 waveguides, 7 high frequency, 8 feeding conductive surface, 8C circular feed surface, 8D Arc slot feeding surface, 1
2 installation base, 50 slot opening / closing means, 61 movable stirrer, 71 high-frequency receiver, 72 horizontal rotating plate (high-frequency receiver moving mechanism).

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Miyamae 1728 Omaeda, Omaeda, Hanazono-cho, Saitama Prefecture 1 Mitsubishi Electric Home Equipment Co., Ltd. (56) Reference JP-A-4-12493 (JP, A) Japanese Unexamined Patent Publication No. 8-124672 (JP, A) Japanese Unexamined Patent Publication No. 9-119650 (JP, A) Japanese Unexamined Patent Publication No. 9-229374 (JP, A) Japanese Unexamined Patent Publication No. 8-321378 (JP, A) Japanese Unexamined Patent Publication No. 2-37216 (JP , A) JP-A-51-130941 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24C 7/02 501 H05B 6/68 320 H05B 6/70 H05B 6/72 H05B 6 / 74

Claims (4)

(57) [Claims] 1. A heating chamber for accommodating an object to be heated, a high frequency generator for generating a high frequency, and a waveguide provided under the heating chamber for transmitting a high frequency generated by the high frequency generator to the heating chamber. A power feeding surface which is provided at the boundary between the substantially central portion of the lower portion of the heating chamber and the waveguide and is set to be equal to or wider than the width of the waveguide up to this point, and a low dielectric constant material. And a mounting table provided on the power feeding surface for setting an object to be heated, the power feeding surface having a circular power feeding surface or a polygonal power feeding surface centered on a substantially central portion of a heating chamber bottom surface, A slot opening / closing means that is formed of an arc-shaped slot power feeding surface provided around the slot opening / closing means, and a slot opening / closing control means that drives and controls the slot opening / closing means based on the detection result of the physical quantity detecting means; Was established High-frequency heating apparatus according to claim. 2. A movable stirrer made of a conductor that randomly reflects high frequencies in multiple directions is provided below the feeding surface in the waveguide, and the stirrer is driven and controlled based on the detection result of the physical quantity detection means. Drive control means is provided
The high frequency heating device according to claim 1 . 3. The high-frequency heating device according to claim 1, further comprising a high-frequency receiver for receiving high-frequency waves and strengthening an electric field, provided below the feeding surface in the waveguide. 4. A high frequency receiver is attached to a movable mechanism, and high frequency receiver position control means is provided for driving the movable mechanism based on the detection result of the physical quantity detection means to control the position of the high frequency receiver. The high frequency heating device according to claim 3, wherein