WO2022220160A1 - 高周波加熱装置 - Google Patents
高周波加熱装置 Download PDFInfo
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- WO2022220160A1 WO2022220160A1 PCT/JP2022/016773 JP2022016773W WO2022220160A1 WO 2022220160 A1 WO2022220160 A1 WO 2022220160A1 JP 2022016773 W JP2022016773 W JP 2022016773W WO 2022220160 A1 WO2022220160 A1 WO 2022220160A1
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- heated
- frequency power
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- transmission body
- distance
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 111
- 230000005540 biological transmission Effects 0.000 claims abstract description 52
- 230000005855 radiation Effects 0.000 claims abstract description 47
- 238000010248 power generation Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 22
- 230000005684 electric field Effects 0.000 description 16
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 238000010411 cooking Methods 0.000 description 9
- 235000013305 food Nutrition 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000000737 periodic effect Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/72—Radiators or antennas
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/70—Feed lines
- H05B6/705—Feed lines using microwave tuning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Definitions
- the present disclosure relates to a high-frequency heating device equipped with a surface wave line that propagates high-frequency power as surface waves.
- Patent Document 1 discloses a high-frequency heating device in which a surface wave line is arranged above an object to be heated.
- a high-frequency heating apparatus described in Patent Document 1 includes a heating chamber, a waveguide, a radio wave transmitter, a table for placing an object to be heated, and a stub-type surface wave line.
- the high-frequency heating device has a plurality of projections inside the heating chamber. By arranging the mounting table on any one of the plurality of projections, the distance between the object to be heated and the surface wave line can be adjusted according to the height of the object to be heated.
- FIG. 11 is a schematic configuration diagram of a normal rotary antenna feeding type high-frequency heating device. As shown in FIG. 11, this type of high-frequency heating device includes a heating chamber 21, a high-frequency power generator 24, a waveguide 25, and a rotating antenna .
- the heating chamber 21 is surrounded by a metal wall surface 21a and has a mounting table 23 arranged therein.
- the high frequency power generator 24 is composed of a magnetron or the like and generates high frequency power.
- the high-frequency power is radiated from the tip of the rotating antenna 26 into the space inside the heating chamber 21 via the waveguide 25, the shaft 26a of the rotating antenna 26, and the horizontal portion 26b of the rotating antenna 26.
- the high-frequency power dielectrically heats the object to be heated 22 placed on the mounting table 23 .
- FIGS. 12A and 12B are schematic diagrams for explaining radiation of high-frequency power P by a conventional rotating antenna feeding system.
- the high-frequency power P propagates as an electric field 27 generated between the horizontal portion 26b and the metal wall surface 21a, and is radiated from the tip of the rotating antenna 26 in the direction in which the rotating antenna 26 is directed.
- FIG. 12B is a schematic diagram of the rotating antenna 26 shown in FIG. 12A viewed along the radiation direction of the high-frequency power P shown in FIG. 12A. As shown in FIG. 12B, in the conventional rotating antenna feeding method, there is a certain amount of gap between the horizontal portion 26b and the metal wall surface 21a.
- the electric field 27 spreads in the horizontal direction around the direction in which the rotating antenna 26 is directed.
- the high-frequency power P is radiated not only in the direction of the rotating antenna 26 but also in directions different from that direction. That is, high-frequency power leakage occurs.
- the radiation position of the high-frequency power near the axis 26a of the rotating antenna 26 hardly moves even if the rotating antenna 26 rotates. As a result, uneven heating occurs. Furthermore, due to the leakage of the high-frequency power as described above, the radiated power from the rotating antenna 26 is reduced, making it difficult to suppress uneven heating.
- the present disclosure provides a high-frequency heating device that is configured to dielectrically heat an object to be heated by high-frequency power that is propagated as a surface wave to a radiating portion and radiated from the radiating portion.
- a high-frequency heating device includes a mounting table, a high-frequency power generation section, a transmission body, and a radiation section. An object to be heated is mounted on the mounting table.
- the high frequency power generator generates high frequency power.
- the transmission body propagates high frequency power as a surface wave.
- the radiating section is arranged on the transmission body and radiates surface waves as high-frequency power.
- high-frequency power can be supplied to the radiating part using a surface wave line that does not leak high-frequency power.
- high-frequency power can be radiated from the optimum height for heating food.
- various objects to be heated can be heated to a desired state.
- FIG. 1 is a schematic configuration diagram of a high-frequency heating device according to Embodiment 1 of the present disclosure.
- FIG. 2 is a schematic perspective view of a transmission body according to Embodiment 1.
- FIG. 3 is a diagram for explaining the distribution of the high-frequency current and the electric field in the stub of the transmission body.
- FIG. 4 is an enlarged perspective view of the transmitter showing the radiating portion located at the end of the transmitter.
- FIG. 5 is a schematic configuration diagram of a high-frequency heating device according to Embodiment 2 of the present disclosure.
- FIG. 6 is a schematic configuration diagram of a high-frequency heating device according to Embodiment 3 of the present disclosure.
- FIG. 7 is a schematic configuration diagram of the high-frequency heating apparatus according to Embodiment 3 in a state in which the mounting table is lowered to the maximum.
- FIG. 8 is a schematic diagram for explaining the heating effect in the vicinity of the object to be heated in FIG.
- FIG. 9 is a schematic configuration diagram of the high-frequency heating apparatus according to Embodiment 3 in a state where the mounting table is arranged higher than the state shown in FIG.
- FIG. 10 is a schematic diagram for explaining the heating effect in the vicinity of the object to be heated in FIG.
- FIG. 11 is a schematic configuration diagram of a conventional high-frequency heating apparatus using a rotating antenna.
- FIG. 12A is a schematic diagram for explaining radiation of high-frequency power in the feeding system using the rotating antenna shown in FIG. 11.
- FIG. 12B is a schematic diagram for explaining radiation of high-frequency power in the feeding system using the rotating antenna shown in FIG. 11.
- FIG. 12A is a schematic diagram for explaining radiation of high-frequency power in the feeding system using the rotating antenna
- the inventors came up with the idea of using the surface wave to heat not only a part of the object to be heated, but also to warm the entire object to be heated.
- the inventors have found that in order to uniformly heat the entire object to be heated, it is necessary to supply high-frequency power to a portion of the object to be heated that is distant from the surface wave line, which is difficult to be heated by surface waves.
- the inventors have arrived at the subject matter of the present disclosure in order to solve the problem.
- a high-frequency heating device includes a mounting table, a high-frequency power generation section, a transmission body, and a radiation section. An object to be heated is mounted on the mounting table.
- the high frequency power generator generates high frequency power.
- the transmission body propagates high frequency power as a surface wave.
- the radiating section is arranged on the transmission body and radiates surface waves as high-frequency power.
- Embodiment 1 Embodiment 1 of the present disclosure will be described below with reference to FIGS. 1 to 4.
- FIG. 1 Embodiment 1 of the present disclosure will be described below with reference to FIGS. 1 to 4.
- FIG. 1 is a schematic configuration diagram of a high-frequency heating apparatus according to this embodiment.
- the high-frequency heating apparatus includes a heating chamber 1, a high-frequency power generating section 4, a transmitter 10, a radiation section 11, a setting section 16, and a control section 17. Prepare.
- the heating chamber 1 is surrounded by a metal wall surface 1a and has a mounting table 3 inside.
- An object to be heated 2 is placed on the mounting table 3 .
- the high-frequency power generator 4 is a magnetron or a semiconductor oscillator configured to generate high-frequency power.
- the transmission body 10 is a surface wave line having two radiating portions 11 arranged at both ends thereof. High-frequency power propagates through the transmission body 10 toward each of the two radiating portions 11 .
- the radiating section 11 is arranged at an appropriate place for suppressing uneven heating, and functions as an antenna that radiates high-frequency power into the heating chamber 1 .
- the user can set the heating output and select the automatic cooking menu via the setting unit 16.
- the control unit 17 controls the heating of the object 2 to be heated by controlling the high-frequency power generation unit 4 based on the heating conditions such as the set heating output and the selected cooking menu.
- the heating conditions may include the type, size, and placement position of the object 2 to be heated.
- FIG. 2 is a schematic perspective view of transmission body 10 in the present embodiment.
- the transmission body 10 includes a periodic structure portion 12 and a coupling portion 13 .
- a plurality of plate-like stubs 12 a are periodically arranged in the periodic structure portion 12 . That is, the plurality of stubs 12a are arranged parallel to each other at regular intervals on the periodic structure portion 12 .
- One end of each stub 12 a is electrically and mechanically coupled to coupling portion 13 .
- the radiating portion 11 is connected to the coupling portion 13 .
- FIG. 3 is a diagram for explaining the distribution of the high-frequency current and the electric field in the stub 12a.
- the transmission body 10 propagates high-frequency power as surface waves.
- FIG. 3 shows an instantaneous high frequency current 9 flowing through stub 12a and coupling 13.
- FIG. 3 is a diagram for explaining the distribution of the high-frequency current and the electric field in the stub 12a.
- the transmission body 10 propagates high-frequency power as surface waves.
- FIG. 3 shows an instantaneous high frequency current 9 flowing through stub 12a and coupling 13.
- the transmitter 10 repeatedly generates a high-frequency current 9 that flows in a flow path (one dotted arrow) from the tip of one stub 12a to the tip of another stub 12a via the coupling portion 13. do.
- high-frequency power which is a surface wave, propagates through the transmission body 10 .
- This channel has a length of about half the wavelength ⁇ of the high-frequency power, and can efficiently propagate the high-frequency power in a resonant state.
- an electric field 8 (solid arrow) is generated around the tip of the stub 12a.
- the electric field 8 is concentrated between the start and end points of the high-frequency current 9 flow path (single dotted arrow). Since the distance between the tips of the two adjacent stubs 12a is short, the electric field 8 is not diffused in the space but concentrated near the tips of the stubs 12a.
- the transmission body 10 can suppress the radiation and leakage of high-frequency power and efficiently propagate the high-frequency power. As a result, heating unevenness can be suppressed.
- the radiation section 11 is a monopole antenna connected to the coupling section 13 of the transmission body 10 .
- the coupling portion 13 is located approximately at the midpoint of the flow path of the high-frequency current 9 propagating as a surface wave, and has a large current distribution, so it is suitable for exciting the antenna.
- the radiation section 11 By connecting the radiation section 11 to the coupling section 13 of the transmission body 10, it is possible to increase the flow of high-frequency current to the radiation section 11, which is an antenna.
- the radiating portion 11 has a plate-like shape.
- the radiating portion 11 may have a rod-like shape, a columnar shape, a rectangular parallelepiped shape, or the like.
- FIG. 4 is an enlarged perspective view of the transmitting body 10 showing the radiating portion 11 arranged at the end of the transmitting body 10.
- FIG. The radiation section 11 performs impedance matching between the transmission body 10 and the space inside the heating chamber 1 . If the transmission body 10 has an impedance lower than the space, impedance matching is achieved if the length L (see FIG. 4) of the radiating section 11 satisfies the following equation (1).
- each of the two radiating sections 11 has a sloped portion that slopes upward with respect to the transmission body 10 so that its tip is closer to the space in the heating chamber 1 than the coupling section 13 .
- the radiating section 11 can direct the radiation range of the high-frequency power from its tip toward the space inside the heating chamber 1 while maintaining impedance matching.
- the length L of the radiating portion 11 is given by Equation (1) above.
- the radiation section 11 functions as a ⁇ /4 impedance transformer.
- the length L of the radiation portion 11 is adjusted within a range of about ⁇ /12. That is, the length L of the radiating portion may satisfy the following formula (2), where ⁇ is the wavelength of the high-frequency power and n is an integer of 0 or more.
- Impedance matching can be optimized by suppressing reflections between the transmitter 10 and the radiating section 11 and between the radiating section 11 and the space within the heating chamber 1 .
- the high-frequency radiation to the space inside the heating chamber 1 can be maximized.
- the impedance matching it is possible to reduce the reflection at the tip of the radiating portion 11 and maximize the radiation of high frequency power into the heating chamber 1 .
- Embodiment 2 of the present disclosure will be described below with reference to FIG. In the following embodiments, the same reference numerals are given to the same or substantially the same constituent elements as in the first embodiment, and redundant explanations will be omitted.
- FIG. 5 is a schematic configuration diagram of a high-frequency heating apparatus according to this embodiment. As shown in FIG. 5, the high-frequency heating device according to this embodiment includes a rotation drive mechanism 14 including a motor.
- the rotary drive mechanism 14 rotates the transmission body 10 and the radiation part 11 in parallel with the mounting table 3 around the coupling portion between the high-frequency power generation part 4 and the transmission body 10 .
- the placement position of the object to be heated may be input by the user via the setting unit 16, or may be detected by a temperature sensor (not shown) that detects the temperature inside the heating chamber 1, or the like.
- the user places the object to be heated 2 on the mounting table 3 and selects a cooking menu via the setting section 16 .
- the user may input the type and size of the object to be heated 2 via the setting section 16 .
- the control unit 17 controls the rotation drive mechanism 14 according to the selected cooking menu and heating conditions such as the type and size of the object 2 to be heated, and sets the orientation, rotation speed, etc. of the radiation unit 11 . After that, the control unit 17 performs heating according to the selected cooking menu.
- the rotation drive mechanism 14 rotates the transmission body 10 and the radiation section 11 .
- the rotation drive mechanism 14 may rotate the mounting table 3 .
- FIG. 6 is a schematic configuration diagram of a high-frequency heating apparatus according to this embodiment.
- the high-frequency heating apparatus according to this embodiment includes an elevation driving mechanism 15 including a motor.
- the elevation drive mechanism 15 moves the mounting table 3 up and down to change the distance between the radiation section 11 and the mounting table 3 . With this configuration, uneven heating in the vertical direction of the object 2 to be heated can be suppressed.
- the user places the object to be heated 2 on the mounting table 3 and selects a cooking menu via the setting section 16 .
- the user may input the type and size of the object to be heated 2 via the setting section 16 .
- the control unit 17 controls the elevation drive mechanism 15 according to the selected cooking menu and the heating conditions such as the type and size of the object 2 to be heated. determine the distance from That is, the control unit 17 causes the elevation drive mechanism 15 to move the mounting table 3 up and down to a height corresponding to the distance.
- the control unit 17 may cause the elevation drive mechanism 15 to change the height of the transmission body 10 over time.
- distance M the distance between the transmission body 10 and the object to be heated 2
- the object to be heated 2 can be partially baked or entirely heated as appropriate.
- Partial baking is to locally and strongly heat the object 2 to be heated to brown a portion of the object 2 to be heated.
- the part of the object to be heated 2 is the part of the object to be heated 2 closest to the mounting table 3 , that is, the bottom surface of the object to be heated 2 .
- Whole heating is to heat the whole to-be-heated material 2 uniformly.
- the control unit 17 determines whether partial baking or total heating is to be performed according to the cooking menu selected via the setting unit 16 . Specifically, for partial baking, the control unit 17 sets the distance M to less than a predetermined distance. For whole heating, the controller 17 sets the distance M to a predetermined distance or more.
- This predetermined distance is a distance at which partial firing is performed by an electric field concentrated in the vicinity of the tip of the stub 12a when the distance M is set to the distance or less.
- the high frequency power propagates through the transmission body 10 as a surface wave.
- the high-frequency power is supplied to the radiating portion 11 without leakage, and the high-frequency power can be radiated from the optimum position for heating the entire device.
- various objects to be heated can be entirely heated to a desired state.
- the object to be heated 2 can be heated as desired by adjusting the distance M using the elevation drive mechanism 15 .
- the elevation drive mechanism 15 moves the mounting table 3 up and down.
- the elevation driving mechanism 15 may move the transmission body 10 and the radiation section 11 up and down.
- FIG. 7 is a schematic configuration diagram of the high-frequency heating apparatus according to the present embodiment when the mounting table 3 is in the lowest state.
- FIG. 8 is a schematic diagram of the vicinity of the object to be heated 2 in FIG.
- the heating effect when the transmission body 10 and the object to be heated 2 approach each other will be described with reference to FIG.
- the distance M1 be 5 mm. This value corresponds to about 1/24 of the wavelength ⁇ of the high frequency power of 2.45 GHz.
- the electric field 8 generated intensively near the tip of the stub 12a heats the object 2 to be heated.
- the object to be heated 2 is strongly heated and baked, and the back side of the object to be heated 2 can be browned.
- the high-frequency energy supplied to the radiation section 11 is small, and the overall heating of the object 2 to be heated by the radiation of high-frequency power from the radiation section 11 is weak.
- the electric field and the range of the electric field generated in the vicinity of the surface wave line are different depending on various conditions such as the type of the surface wave line, the design of the degree of concentration of the high frequency power, and the frequency and power value of the high frequency power. Therefore, we conducted heating experiments using surface waves for several kinds of foods.
- FIG. 9 is a schematic configuration diagram of the high-frequency heating apparatus according to the present embodiment in a state where the mounting table 3 is raised from the state shown in FIG.
- FIG. 10 is a schematic diagram of the vicinity of the object to be heated 2 in FIG. Using FIG. 10, the heating effect when the transmitter 10 is farther from the object 2 to be heated than in the case shown in FIG. 8 will be described.
- the distance M2 be 15 mm. This value corresponds to about 1/8 of the wavelength ⁇ of the high frequency power of 2.45 GHz.
- the transmission body 10 can transmit high-frequency power to the radiation section 11 without power loss. As a result, the radiation of the high-frequency power from the radiating section 11 heats the entire object 2 more strongly than in the case shown in FIG.
- the distance M is set to 15 mm or more, it is possible to suppress the absorption of the high-frequency power, which is a surface wave, by the object 2 to be heated while propagating through the surface wave line. In this case, overall heating can be performed.
- control unit 17 can appropriately perform any one of the whole heating, the browning heating, and the non-browning partial heating for the object 2 to be heated.
- the distance M is set to 15 mm or more, heating unevenness can be suppressed by performing the entire heating.
- the distance M is set to 5 mm or less, browning heating capable of partially browning the food can be performed. If the distance M is set to be greater than 5 mm and 10 mm or less, partial heating can be performed without browning the food.
- the predetermined distance is preferably 5 mm (ie, 1/24 of the wavelength ⁇ ) or more and 15 mm (ie, 1/8 of the wavelength ⁇ ) or less.
- Numerical values (5 mm, 10 mm, 15 mm) regarding the distance M are examples and are not limited to these numerical values.
- the distance M is the distance between the bottom surface of the object to be heated 2, or more precisely, the top surface of the mounting table 3 with which the bottom surface of the object to be heated 2 is in contact, and the tip of the stub 12a of the transmission body 10.
- the degree of concentration of the electric field 8 near the tip of the stub 12a is related to the frequency of the propagating RF power. For this reason, the control unit 17 causes the high-frequency power generation unit 4 to adjust the frequency of the high-frequency power so that the object 2 to be heated 2 can be entirely heated, browned, or partially heated. can be done.
- the predetermined distance does not necessarily need to be set to 5 mm or more and 15 mm or less, and the setting can be changed as appropriate.
- the transmission body 10 may be moved up and down instead of moving the mounting table 3 up and down as in the third embodiment.
- the appropriate range for the predetermined distance may not be 5 mm or more and 15 mm or less.
- the controller 17 may appropriately adjust the predetermined distance so that the object to be heated 2 is heated to a desired state.
- the user may input through the setting unit 16 that the object to be heated 2 is in the container in order to adjust the appropriate range for the predetermined distance.
- the height of the object 2 to be heated may be detected by an optical sensor or the like.
- the transmission body 10 has a periodic structure portion 12 in which a plurality of plate-like stubs 12a are periodically arranged, and one end of each of the plurality of stubs 12a is electrically and mechanically connected. and a coupling portion 13 that
- the transmission body 10 may have another form.
- the surface wave waveguide may have a flat plate structure having a periodic structure.
- the periodic structure portion 12 may be of ladder type, meander type, or interdigital type.
- Using a flat plate structure allows the high-frequency heating device to be made compact. As a result, the transmission body 10 can be rotated and moved up and down more easily.
- high-frequency power can be supplied to the radiating section 11 using a surface wave line that does not leak high-frequency power.
- high-frequency power can be radiated from the optimum height for heating food.
- various objects to be heated 2 can be heated to a desired state.
- the distance M between the transmitter 10 and the upper surface of the mounting table 3 or the object to be heated 2 may be set to a predetermined distance or more.
- the high-frequency power propagates through the transmission body 10 as surface waves and is supplied to the radiation section 11 without leakage.
- high-frequency power can be radiated from the optimum position for overall heating.
- various objects to be heated can be heated to a desired state.
- the distance M between the transmitter 10 and the top surface of the mounting table 3 or the object to be heated 2 may be set to a predetermined distance or less.
- the object 2 to be heated can be partially baked.
- the object to be heated can be entirely heated or partially baked. and partial heating can be performed as appropriate.
- the predetermined distance may be 5 mm or more and 15 mm or less.
- the predetermined distance may be 1/24 or more of the wavelength ⁇ of the high-frequency power and 1/8 or less of the wavelength ⁇ .
- the radiating section 11 may have an inclined portion arranged at its tip and inclined with respect to the transmission body 10 .
- the radiation range of the high-frequency power from the tip of the radiation section 11 can be directed toward the space inside the heating chamber 1 while maintaining impedance matching.
- the slanted portion may be slanted toward the mounting table 3 .
- the radiation range of the high-frequency power from the tip of the radiation section 11 can be directed toward the space inside the heating chamber 1 while maintaining impedance matching.
- the orientation of the radiation section 11 may be changeable according to the placement position of the object 2 to be heated. By radiating high-frequency power toward the mounting position of the object to be heated 2, the object to be heated 2 can be heated to a desired state.
- the length L of the radiating portion may satisfy the following formula (2), where ⁇ is the wavelength of the high-frequency power and n is an integer of 0 or more.
- the impedance of the radiation section may be adjusted to match the spatial impedance of the radiation destination.
- the impedance matching of the radiating section can suppress reflection at the radiating section and improve the radiation efficiency.
- control section 17 may cause the high-frequency power generation section 4 to change the frequency of the high-frequency power. This makes it possible to control the degree of concentration of surface waves in the transmission body 10 and change the intensity and range of the distributed electric field. As a result, the intensity and range of heating of the object 2 to be heated can be controlled.
- the transmission body may be aligned with the space inside the heating chamber 1 by the radiation part. As a result, reflection at the radiation portion can be suppressed, and radiation efficiency is improved.
- the high-frequency heating device according to the present disclosure can be applied to general household cooking appliances.
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Abstract
Description
発明者らが本開示に想到するに至った当時、表面波として伝播した高周波電力により被加熱物を加熱するという技術は、被加熱物の一部を焼くための技術として知られていた。
以下、図1~図4を用いて、本開示の実施の形態1を説明する。
図1は、本実施の形態に係る高周波加熱装置の概略構成図である。図1に示すように、本実施の形態に係る高周波加熱装置は、加熱室1と、高周波電力発生部4と、伝送体10と、放射部11と、設定部16と、制御部17とを備える。
図2は、本実施の形態における伝送体10の概略斜視図である。伝送体10は、周期構造部12と、結合部13とを含む。周期構造部12には、複数の板状のスタブ12aが周期的に配置される。すなわち、複数のスタブ12aは、周期構造部12上に一定の間隔で互いに平行に配置される。スタブ12aの各々の一端は、電気的かつ機械的に結合部13に結合される。放射部11は、結合部13に接続される。
放射部11は、伝送体10の結合部13に接続されたモノポール型アンテナである。結合部13は、表面波として伝播する高周波電流9の流路のほぼ中間地点に位置し、電流分布が大きいため、アンテナの励振に適している。
図3に示すように、2つの放射部11の各々は、その先端が結合部13よりも加熱室1内の空間に近くなるように伝送体10に対して上方に傾斜する傾斜部分を有する。この構成により、放射部11は、インピーダンス整合を維持しつつ、その先端からの高周波電力の放射範囲を加熱室1内の空間に向けることができる。
この調整は、放射部11が伝送体10と結合する位置のインピーダンスと、放射部11の先端から高周波電力が放射される空間を見たインピーダンスとに基づいて行われる。
以下、図5を用いて、本開示の実施の形態2を説明する。以下の実施の形態において、実施の形態1と同一または実質同一の構成要素には同じ符号を付し、重複する説明を省略する。
図5は、本実施の形態に係る高周波加熱装置の概略構成図である。図5に示すように、本実施の形態に係る高周波加熱装置は、モータを含む回転駆動機構14を備える。
以下、図6~図10を用いて、本開示の実施の形態3を説明する。
図6は、本実施の形態に係る高周波加熱装置の概略構成図である。図6に示すように、本実施の形態に係る高周波加熱装置は、モータを含む昇降駆動機構15を備える。昇降駆動機構15は載置台3を上下動させ、放射部11と載置台3との距離を変更する。この構成により、被加熱物2における垂直方向の加熱むらを抑制することができる。
図7は、本実施の形態に係る高周波加熱装置の、載置台3が最も下降した状態における概略構成図である。
図9は、本実施の形態に係る高周波加熱装置の、図7に示す状態よりも載置台3が上昇した状態における概略構成図である。
スタブ12aの先端近傍における電界8の集中度合いは、伝播する高周波電力の周波数と関連する。このため、制御部17は、高周波電力発生部4に高周波電力の周波数を調整させることで、被加熱物2に対して全体加熱と、焦げ目付け加熱と、部分加熱とのいずれかを適宜行うことができる。
以上のように、上記実施の形態によれば、高周波電力の漏洩がない表面波線路を使用して、高周波電力を放射部11に供給することができる。また、食品を加熱するのに最適な高さから高周波電力を放射することができる。その結果、種々の被加熱物2を所望の状態に加熱することができる。
これにより、伝送体10と加熱室1内の空間との間のインピーダンス整合を達成することができる。その結果、反射を抑制することができ、放射効率が向上する。
1a 金属壁面
2 被加熱物
3 載置台
4 高周波電力発生部
8 電界
9 高周波電流
10 伝送体
11 放射部
12 周期構造部
12a スタブ
13 結合部
14 回転駆動機構
15 昇降駆動機構
16 設定部
17 制御部
21 加熱室
21a 金属壁面
22 被加熱物
23 載置台
24 高周波電力発生部
25 導波管
26 回転アンテナ
26a 軸
26b 水平部
27 電界
Claims (11)
- 被加熱物を載置するように構成された載置台と、
高周波電力を発生させるように構成された高周波電力発生部と、
前記高周波電力を表面波として伝播させるように構成された伝送体と、
前記伝送体に配置され、前記表面波を高周波電力として放射するように構成された放射部と、を備えた、高周波加熱装置。 - 前記載置台を上下動させるように構成された昇降駆動機構と、
前記昇降駆動機構を制御するように構成された制御部と、をさらに備え、
前記制御部は、前記高周波電力により前記被加熱物の全体を加熱する全体加熱を行うように、前記昇降駆動機構に、前記載置台の上面または前記被加熱物と前記伝送体との距離を所定距離以上に設定させる、請求項1に記載の高周波加熱装置。 - 前記制御部は、前記表面波により前記被加熱物の一部に焦げ目をつける部分焼成を行うように、前記昇降駆動機構に、前記載置台の上面または前記被加熱物と前記伝送体との距離を所定距離以下に設定させる、請求項2に記載の高周波加熱装置。
- 使用者に加熱条件を設定させるように構成された設定部をさらに備え、
前記制御部は、前記加熱条件に応じて、前記昇降駆動機構に、前記部分焼成の場合は前記伝送体と前記被加熱物との距離を所定距離以下に設定させ、前記全体加熱の場合は前記伝送体と前記被加熱物との距離を所定距離以上に設定させる、請求項3に記載の高周波加熱装置。 - 前記所定距離は5mm以上かつ15mm以下である、請求項2から4のいずれか1項に記載の高周波加熱装置。
- 前記所定距離は、前記高周波電力の波長の24分の1以上かつ前記波長の8分の1以下である、請求項2から4のいずれか1項に記載の高周波加熱装置。
- 前記放射部は、前記放射部の先端に配置され、前記伝送体に対して傾斜する傾斜部分を有する、請求項1に記載の高周波加熱装置。
- 前記傾斜部分は前記載置台に向けて傾斜する、請求項7に記載の高周波加熱装置。
- 前記伝送体を回転させるように構成された回転駆動機構と、をさらに備え、
前記制御部は、前記回転駆動機構に、前記被加熱物の載置位置に応じて前記放射部の向きを変更させる、請求項1に記載の高周波加熱装置。 - 前記放射部の長さLは、前記高周波電力の波長をλ、nを0以上の整数とした場合に、以下の数式を満たす、
L=λ/4+λ/2×n±λ/12
請求項1に記載の高周波加熱装置。 - 前記制御部は、前記高周波電力発生部に前記高周波電力の周波数を調整させるように構成された、請求項2に記載の高周波加熱装置。
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51142141A (en) | 1975-06-02 | 1976-12-07 | Matsushita Electric Ind Co Ltd | High frequency heater |
JPH07161471A (ja) * | 1993-12-07 | 1995-06-23 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
WO2018003546A1 (ja) * | 2016-06-30 | 2018-01-04 | パナソニックIpマネジメント株式会社 | 高周波加熱装置 |
JP2018152245A (ja) * | 2017-03-13 | 2018-09-27 | 富士通株式会社 | マイクロ波加熱装置、及び、マイクロ波加熱装置の制御方法 |
WO2019194098A1 (ja) * | 2018-04-06 | 2019-10-10 | パナソニックIpマネジメント株式会社 | 高周波加熱装置 |
JP2020064705A (ja) * | 2018-10-15 | 2020-04-23 | パナソニックIpマネジメント株式会社 | 高周波プラズマ処理装置 |
JP2020161348A (ja) * | 2019-03-27 | 2020-10-01 | パナソニックIpマネジメント株式会社 | 高周波加熱装置 |
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51142141A (en) | 1975-06-02 | 1976-12-07 | Matsushita Electric Ind Co Ltd | High frequency heater |
JPH07161471A (ja) * | 1993-12-07 | 1995-06-23 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
WO2018003546A1 (ja) * | 2016-06-30 | 2018-01-04 | パナソニックIpマネジメント株式会社 | 高周波加熱装置 |
JP2018152245A (ja) * | 2017-03-13 | 2018-09-27 | 富士通株式会社 | マイクロ波加熱装置、及び、マイクロ波加熱装置の制御方法 |
WO2019194098A1 (ja) * | 2018-04-06 | 2019-10-10 | パナソニックIpマネジメント株式会社 | 高周波加熱装置 |
JP2020064705A (ja) * | 2018-10-15 | 2020-04-23 | パナソニックIpマネジメント株式会社 | 高周波プラズマ処理装置 |
JP2020161348A (ja) * | 2019-03-27 | 2020-10-01 | パナソニックIpマネジメント株式会社 | 高周波加熱装置 |
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US20240172337A1 (en) | 2024-05-23 |
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