WO2022176655A1 - 高周波加熱装置 - Google Patents
高周波加熱装置 Download PDFInfo
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- WO2022176655A1 WO2022176655A1 PCT/JP2022/004531 JP2022004531W WO2022176655A1 WO 2022176655 A1 WO2022176655 A1 WO 2022176655A1 JP 2022004531 W JP2022004531 W JP 2022004531W WO 2022176655 A1 WO2022176655 A1 WO 2022176655A1
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- electrode
- heated
- frequency power
- heating
- control unit
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 206
- 238000013021 overheating Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 20
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 13
- 235000013372 meat Nutrition 0.000 description 13
- 239000003990 capacitor Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000010411 cooking Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000002023 wood 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
- H05B6/46—Dielectric heating
- H05B6/48—Circuits
- H05B6/50—Circuits for monitoring or control
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- 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
- H05B6/46—Dielectric heating
- H05B6/54—Electrodes
Definitions
- This disclosure relates to a high frequency heating device.
- Patent Document 1 a high-frequency heating device that heats the object by placing the object to be heated between opposing electrodes and supplying high-frequency power to the electrodes.
- the high-frequency heating apparatus described in Patent Document 1 supplies high-frequency power to a plate-shaped electrode that is smaller than the object to be heated, and then supplies high-frequency power to a plate-shaped electrode that is larger than the electrode.
- the above conventional high-frequency heating apparatus is intended to prevent high-frequency energy from concentrating on the ridge and to uniformly heat the object to be heated.
- An object of the present disclosure is to provide a high-frequency heating apparatus capable of heating multiple types of objects to be heated having different sizes with a simpler configuration.
- a high-frequency heating device of the present disclosure includes a heating chamber, a first electrode, a second electrode, a high-frequency power source, and a controller.
- the first electrode is an electrode placed inside the heating chamber.
- a 2nd electrode is an electrode which is arrange
- a high frequency power supply generates high frequency power. The controller controls the high frequency power supply.
- the control unit causes the high-frequency power source to apply high-frequency power between the first electrode and the second electrode to control heating of the object placed between the first electrode and the second electrode.
- the control unit controls the high-frequency power supply so as to selectively perform heating in a normal mode for the entire object to be heated and heating in a protection mode for suppressing local overheating of the object to be heated.
- the high-frequency heating device of the present disclosure can heat an object to be heated with a simple configuration.
- FIG. 1 is a schematic configuration diagram of a high-frequency heating device according to Embodiment 1 of the present disclosure.
- 2 is a schematic plan view of a first electrode according to Embodiment 1.
- FIG. 3 is a schematic plan view showing the position of the object to be heated on the first electrode according to Embodiment 1.
- FIG. 4 is a schematic plan view showing the position of the object to be heated on the first electrode according to Embodiment 1.
- FIG. FIG. 5 is a diagram showing selectable heating courses and the operation of the high-frequency heating device in each heating course in the first embodiment.
- FIG. 6 is a schematic configuration diagram of a high-frequency power supply according to Embodiment 1.
- FIG. FIG. 7 is a schematic configuration diagram of a matching section according to the first embodiment.
- FIG. 8 is a diagram showing the temperature distribution of the object to be heated that has been thawed in heating courses AD.
- FIG. 9 is a schematic configuration diagram of a high-frequency heating device according to Embodiment 2 of the present disclosure.
- 10 is a schematic plan view of a first electrode according to Embodiment 2.
- FIG. 11 is a schematic plan view showing the position of the object to be heated on the first electrode according to Embodiment 2.
- FIG. FIG. 12 is a diagram showing selectable heating courses and the operation of the high-frequency heating device in each heating course in the second embodiment.
- a high-frequency heating device includes a heating chamber, a first electrode, a second electrode, a high-frequency power source, and a controller.
- the first electrode is an electrode placed inside the heating chamber.
- a 2nd electrode is an electrode which is arrange
- a high frequency power supply generates high frequency power. The controller controls the high frequency power supply.
- the control unit causes the high-frequency power source to apply high-frequency power between the first electrode and the second electrode to control heating of the object placed between the first electrode and the second electrode.
- the control unit controls the high-frequency power supply so as to selectively perform heating in a normal mode for the entire object to be heated and heating in a protection mode for suppressing local overheating of the object to be heated.
- the protection mode in the protection mode, overheating of the object to be heated can be suppressed and the object to be heated can be uniformly heated. In normal mode, the entire object to be heated can be heated more quickly than in protection mode.
- the protection mode is effective when the height of the object to be heated is higher than a predetermined value, and when the initial temperature of the object to be heated is lower than a predetermined value.
- the normal mode is effective when the height of the object to be heated is lower than a predetermined value.
- the first electrode includes a plurality of split electrodes.
- the control unit causes the high-frequency power source to supply high-frequency power to the split electrode, among the plurality of split electrodes, that faces a portion of the object to be heated.
- the control section causes the high-frequency power supply not to supply high-frequency power to the split electrodes, of the plurality of split electrodes, that face other portions of the object to be heated.
- the controller causes the high-frequency power source to supply high-frequency power to the segmented electrodes facing the portion of the object to be heated.
- the control unit does not supply the high-frequency power to the divided electrodes facing other parts of the object to be heated.
- control unit causes the high-frequency power supply not to supply high-frequency power to the split electrodes facing part of the object to be heated.
- control unit supplies high-frequency power to the split electrodes facing other portions of the object to be heated.
- a high-frequency heating device in addition to the first aspect, further includes a position adjusting section that adjusts the distance between the first electrode and the second electrode. According to this aspect, the distance between the object to be heated and the electrode can be set to an optimum value in the protection mode and the normal mode.
- the position adjustment unit keeps the first electrode away from the object to be heated more than in the normal mode. According to this aspect, it is possible to uniformly heat the entire object to be heated while avoiding local overheating of the object to be heated.
- the control unit in addition to the first aspect, in the protection mode, causes the high-frequency power supply to generate high-frequency power with a smaller heating output per unit time than in the normal mode. Let According to this aspect, overheating of the object to be heated can be suppressed in the protection mode.
- a high-frequency heating apparatus further includes, in addition to the first aspect, a camera that is arranged in the heating chamber and captures an image of the object to be heated.
- the control unit detects the dimensions of the object to be heated from the image of the object to be heated captured by the camera.
- the control section can set the range of the electrodes to which the high-frequency power is supplied according to the dimensions of the object to be heated.
- the high-frequency heating device further includes a temperature detection unit that detects the temperature of the object to be heated, in addition to the first aspect.
- the control unit can detect the temperature and approximate dimensions of the object to be heated.
- the control unit can cause the high frequency power supply to stop outputting high frequency power or reduce the power level of the high frequency power. As a result, partial overheating of the object to be heated can be suppressed.
- the high-frequency heating device further includes an operation unit for inputting selection of the normal mode and selection of the protection mode by the user.
- the high-frequency heating device can be operated in either the protection mode or the normal mode at the discretion of the user.
- the X-, Y-, and Z-axes shown in the drawings respectively indicate the width direction (horizontal direction), depth direction (front-rear direction), and height direction (vertical direction) of the high-frequency heating device. That is, the right side of the high-frequency heating device is the positive direction of the X-axis, the rear side of the high-frequency heating device is the positive direction of the Y-axis, and the vertically upward direction of the high-frequency heating device is the positive direction of the Z-axis.
- FIG. 1 is a block configuration diagram schematically showing a high-frequency heating device 1A according to Embodiment 1. As shown in FIG.
- the high-frequency heating device 1A includes a first electrode 11A, a second electrode 12, a position adjusting section 20, a high-frequency power source 30, a matching section 40, an operating section 50 and a control section 60.
- the first electrode 11A and the second electrode 12 are flat electrodes arranged in the heating chamber 13 and parallel to the XY plane.
- the first electrode 11A is arranged above the second electrode 12 so as to face the second electrode 12 . Therefore, when the object 90 to be heated is placed on the second electrode 12 , the object 90 to be heated is arranged between the first electrode 11A and the second electrode 12 .
- the control unit 60 controls the high frequency power supply 30 .
- the high frequency power supply 30 is connected to the first electrode 11A via the matching section 40 and directly connected to the second electrode 12 .
- the high frequency power supply 30 generates high frequency power and applies the high frequency power between the first electrode 11A and the second electrode 12 . Thereby, an electric field is generated between the first electrode 11A and the second electrode 12 .
- This electric field dielectrically heats the object to be heated 90 arranged between the first electrode 11A and the second electrode 12 .
- the object 90 to be heated is a dielectric, such as food. In this manner, the high-frequency heating device 1A heats or defrosts the object 90 to be heated.
- the high frequency power supply 30 supplies high frequency power to both the first electrode 11A and the second electrode 12 .
- the second electrode 12 may be grounded and the high frequency power supply 30 may supply high frequency power only to the first electrode 11A.
- the first electrode 11A may be grounded and the high frequency power supply 30 may supply high frequency power only to the second electrode 12.
- the high-frequency power supply 30 may supply high-frequency power to either one or both of the first electrode 11A and the second electrode 12.
- FIG. 2 is a schematic configuration diagram of the first electrode 11A in plan view, that is, when viewed from above along the Z axis. As shown in FIG. 2, the first electrode 11A includes split electrodes 14A, split electrodes 14B, split electrodes 14C, and split electrodes 14D.
- the split electrodes 14A to 14D are flat plate electrodes formed in a rectangular shape, and are arranged in order from the left side.
- the control unit 60 can cause the high frequency power supply 30 to separately supply high frequency power to each of the segmented electrodes 14A to 14D.
- the divided electrode 14A has the largest area, and the divided electrodes 14B to 14D have approximately the same area.
- the segmented electrodes 14B-14D are movable along the Z-axis by the position adjusting section 20. FIG.
- the shape of the split electrodes 14A to 14D is not limited to rectangular. Segmented electrodes 14A-14D may be square, circular including elliptical, or polygonal other than square.
- the second electrode 12 is a plate-like electrode formed in a rectangular shape.
- the second electrode 12 is arranged to face the first electrode 11A.
- the second electrode 12 is arranged below the first electrode 11A within the heating chamber 13 .
- the second electrode 12 is not limited to a single electrode.
- the second electrode 12 may be composed of a plurality of electrodes and may have a square shape, a circular shape including an elliptical shape, or a polygonal shape with five or more sides. The position of the first electrode 11A and the position of the second electrode 12 may be interchanged.
- the position adjusting section 20 moves the first electrode 11A up and down to adjust the height of the first electrode 11A. Thereby, the distance between the first electrode 11A and the second electrode 12 is adjusted.
- the position adjusting section 20 may vertically move the second electrode 12 instead of the first electrode 11A, or may move both the first electrode 11A and the second electrode 12 vertically.
- the position adjustment unit 20 has, for example, a motor and a connecting member that connects the motor to the first electrode 11A.
- the motor is arranged on the ceiling of the heating chamber 13 . Rotation of the motor causes the connection member to move up and down, thereby moving the first electrode 11A up and down.
- the connection member may be, for example, a rod-shaped member or a wire.
- the control section 60 controls the position adjustment section 20 .
- position adjusting section 20 may be configured to move either or both of the first electrode 11A and the second electrode 12 .
- FIG. 6 is a schematic configuration diagram of the high-frequency power supply 30.
- high-frequency power supply 30 includes high-frequency oscillator 31 , amplifier 32 , and amplifier 33 .
- the high-frequency oscillator 31 oscillates and outputs a high-frequency signal having a frequency within the HF to VHF bands.
- Amplifiers 32 and 33 amplify the high frequency signal transmitted from high frequency oscillator 31 to an arbitrary power level. Thereby, the high frequency power supply 30 can output high frequency power having a desired frequency and power level.
- the matching section 40 is connected between the first electrode 11A and the high frequency power supply 30.
- the matching unit 40 matches the impedance of the high frequency power supply 30 with the impedance inside the heating chamber 13 including the first electrode 11A, the second electrode 12 and the object 90 to be heated.
- FIG. 7 is a schematic configuration diagram of the matching section 40.
- the matching section 40 includes a coil L1, a coil L2, a variable capacitor VC1, and a variable capacitor VC2.
- coil L1, coil L2 and variable capacitor VC2 are arranged in series, and variable capacitor VC1 is arranged in parallel with other elements.
- the control unit 60 changes the electric capacitances of the variable capacitors VC1 and VC2. Thereby, the matching unit 40 performs impedance matching.
- the configuration of the matching section 40 shown in FIG. 7 is an example, and is not limited to this. Also, in the present disclosure, the matching section 40 is not an essential component.
- the control unit 60 is electrically connected to the position adjustment unit 20, the high frequency power supply 30, and the operation unit 50.
- the control unit 60 controls the position adjustment unit 20 and the high frequency power source 30 based on information input by the user via the operation unit 50 .
- the information from the user includes the dimensions of the heated object 90 and the heating mode.
- the control unit 60 instructs the position adjustment unit 20 about the direction and amount of movement of the first electrode 11A, and instructs the high-frequency power source 30 about the frequency and power level of the high-frequency power.
- the control unit 60 uniformly heats the object 90 to be heated by adjusting the height of the first electrode 11A and the high-frequency power supplied to the first electrode 11A and the second electrode 12 .
- FIG. 3 is a schematic plan view showing the positional relationship between the object to be heated 90 and the first electrode 11A when viewed from above along the Z-axis when the frozen meat block is heated in the heating course A.
- the heating course A is one of the normal mode heating courses.
- FIG. 4 is a schematic plan view showing the positional relationship between the object to be heated 90 and the first electrode 11A when viewed from above along the Z-axis when the frozen meat block is heated in the heating course B.
- the dimensions of the frozen meat glock shown in Figures 3 and 4 are 200mm wide x 100mm deep x 100mm high.
- the heating course B is also one of the heating courses in the normal mode.
- the user places the object 90 to be heated on a dedicated heating tray, and places the heating tray on the second electrode.
- the user operates the power switch arranged on the operation section 50 to turn on the power of the high-frequency heating device 1A.
- the heating course includes a normal mode heating course and a protection mode heating course. That is, the user inputs selection of the normal mode and selection of the protection mode via the operation unit 50 . After that, the user presses the start button arranged on the operation unit 50 to start heating.
- FIG. 5 is a list of heating courses that can be selected in Embodiment 1 and the operation of the high-frequency heating device 1A in each heating course.
- the object 90 to be heated is assumed to be a frozen meat block of width 200 mm ⁇ depth 100 mm ⁇ height 100 mm.
- the object 90 to be heated is assumed to be a fence of frozen sashimi measuring 150 mm wide by 50 mm deep by 30 mm high.
- the high-frequency heating device 1A when the heating course A, which is the normal mode, is selected will be described.
- the user Before operating the high-frequency heating device 1A, the user places a 20 mm-thick heating tray on which frozen meat, which is the object 90 to be heated, is placed in the center on the second electrode.
- the thickness of this heating tray is 20 mm, and the distance between the object to be heated 90 and the second electrode is 20 mm.
- the control unit 60 causes the position adjustment unit 20 to move the first electrode 11A so that the distance between the first electrode 11A and the second electrode 12 is 140 mm.
- the distance between the object 90 to be heated and the first electrode 11A is 20 mm.
- control unit 60 causes the high-frequency power supply 30 to output high-frequency power of 500 W for 10 minutes, with all of the divided electrodes 14A to 14D of the first electrode 11A as the high-frequency power supply range. After 10 minutes, the control unit 60 informs the user that the heating has ended by voice and display, and terminates the heating.
- the user may operate the operation unit 50 to continue the heating according to the state of the object 90 to be heated.
- the user may set the heating output, the distance between the electrodes, and the range of high-frequency power supplied by the first electrode 11A using additional heating keys provided on the operation unit 50 .
- the operation of the high-frequency heating device 1A when the heating course B, which is the protection mode, is selected will be described.
- the differences between the heating course A and the heating course B are the placement position of the object to be heated 90 on the dedicated tray, the range of high-frequency power supplied by the first electrode 11A, the distance between the electrodes, the heating output, and the heating time. .
- the user places the object 90 to be heated on the left end of the dedicated tray in the width direction, ie, the left-right direction, and the center in the depth direction.
- the control unit 60 supplies high-frequency power only to the split electrode 14A out of the split electrodes 14A to 14D.
- the range of high-frequency power supplied by the first electrode 11A is 150 mm ⁇ 200 mm, which is smaller than in the case of the heating course A.
- most of the object 90 to be heated is located on the split electrode 14A.
- the portion of the object 90 to be heated up to 25 mm from both ends protrudes along the X-axis from the split electrode 14A to which high-frequency power is supplied.
- the length of split electrode 14A along the X-axis is shorter than the length of object 90 to be heated along the X-axis.
- the control unit 60 causes the high-frequency power supply 30 to supply high-frequency power to the split electrode 14A, which faces a portion of the object 90 to be heated, among the split electrodes 14A to 14D.
- the control unit 60 does not cause the high-frequency power supply 30 to supply the high-frequency power to the split electrodes 14B to 14D, which face other parts of the object 90 to be heated, among the split electrodes 14A to 14D.
- the distance between the first electrode 11A and the second electrode 12 is 160 mm, and the heating tray has the same thickness of 20 mm as in the normal mode. Therefore, the distance between the object 90 to be heated and the second electrode 12 is 20 mm. Since the distance between the electrodes is 160 mm, the height of the object 90 to be heated is 100 mm, and the thickness of the heating tray is 20 mm, the distance between the object 90 to be heated and the first electrode 11A is 40 mm.
- the distance between the heated object 90 and the first electrode 11A is 20 mm larger than in the normal mode.
- the electric field is strong near the end of the first electrode 11A to which high-frequency power is supplied.
- the distance is larger than in the normal mode, local overheating near the end of the first electrode 11A to which high-frequency power is supplied can be suppressed.
- the heating power is set to 250 W, which is lower than that of normal mode, and the heating time is set to 20 minutes, which is longer than that of normal mode.
- the protection mode high-frequency power with a smaller heating output is supplied for a longer period of time than in the normal mode. That is, in the protection mode, the heating output per unit time is smaller than in the normal mode, so that the object to be heated 90 can be heated more uniformly than in the normal mode.
- a heating output of 250 W means continuously outputting 250 W of high-frequency power.
- a heating output of 250 W means continuously outputting 250 W of high-frequency power.
- by intermittently outputting a high-frequency power greater than 250 W with a time average of 250 W it is possible to achieve a heating output of 250 W.
- FIG. 8 shows the temperature distribution of the object to be heated 90 viewed from above (in the XY plane) when the frozen product, which is the object to be heated 90, is thawed in the heating courses AD.
- the temperature (° C.) shown in the drawing is the temperature of the central portion of the object 90 to be heated in the vertical direction.
- the temperature distribution (a) in FIG. 8 is the temperature distribution of frozen meat when it is thawed in the heating course A that heats the entire object 90 to be heated.
- Heating course A is a normal mode, and frozen meat of width 200 mm ⁇ depth 100 mm ⁇ height 100 mm is thawed by heating course A.
- the temperature distribution (b) in FIG. 8 is the temperature distribution of frozen meat when it is thawed in the heating course B that partially heats the object 90 to be heated.
- the heating course B is also the normal mode, and the dimensions of the frozen meat are the same as in the case of the heating course A.
- the temperature distribution (c) in FIG. 8 is the temperature distribution when frozen sashimi with a temperature of ⁇ 20° C. and dimensions of width 150 mm ⁇ depth 50 mm ⁇ height 30 mm is thawed in the heating course C, which is the normal mode.
- the temperature distribution (d) in FIG. 8 shows the initial temperature ( ⁇ 60° C.) lower than that of a normal frozen product, and the frozen sashimi with the same dimensions as a normal frozen product. distribution.
- the temperature distribution (e) in FIG. 8 is the temperature distribution when frozen sashimi with a temperature of ⁇ 60° C. and dimensions of 150 mm in width ⁇ 50 mm in depth ⁇ 30 mm in height is thawed in the heating course C.
- the temperature distribution (e) in FIG. 8 is a comparative example with respect to the temperature distribution (d) in FIG.
- the temperature in the four corners is higher than the other parts, and the temperature in the center is lower than the other parts.
- the frozen meat is not heated enough to cause discoloration and is ready to be cut with a kitchen knife. That is, frozen meat is thawed to the extent that it is ready for cooking.
- the frozen meat thawed in the heating course B is heated to a substantially uniform temperature as a whole and can be easily cut with a kitchen knife.
- the heating time in the heating course B is longer than that in the heating course A.
- the entire object to be heated 90 can be uniformly thawed while suppressing the temperature rise at the four corners. A user can select which of these heating courses to use according to the purpose.
- the frozen sashimi thawed in heating course C and heating course D are both heated to a substantially uniform temperature and ready to be cut with a kitchen knife.
- the maximum ice crystal formation zone is a temperature zone in which ice crystals tend to grow larger during the process of freezing food, and usually refers to a temperature zone of -1°C to -5°C where food begins to freeze.
- the place where the object to be heated 90 should be placed may be displayed on the heating tray. Depending on the size of the object 90 to be heated, the range of the first electrode 11A to which the high frequency power is supplied is changed. If the place to put the object 90 to be heated is indicated on the heating tray, the user can easily place the object 90 to be heated at the correct position.
- a heating tray having a thickness corresponding to each heating course may be prepared.
- a guide for placing the tray may be provided on the side wall of the heating chamber 13 so that the distance between the heating tray and the second electrode 12 is a desired distance. Thereby, the distance between the second electrode 12 and the object 90 to be heated can be appropriately adjusted, and the object 90 to be heated can be heated more uniformly.
- the high-frequency heating device 1A has four heating courses. However, the number of heating courses is not limited to this.
- control unit 60 may read the heating course from a storage medium such as a flash memory card.
- the control unit 60 may download the heating course via the Internet.
- the operation part is not limited to buttons.
- the operation unit may have a liquid crystal touch panel.
- a smartphone or the like may be used as the operation unit.
- the high-frequency heating device 1A may be operated by voice via a smartphone or the like.
- Embodiment 2 A high-frequency heating device 1B according to Embodiment 2 of the present disclosure will be described. In the second embodiment, differences from the first embodiment will be mainly described. In Embodiment 2, the same reference numerals are given to the same or equivalent configurations as in Embodiment 1, and overlapping descriptions are omitted.
- FIG. 9 is a block configuration diagram schematically showing a high-frequency heating device 1B according to Embodiment 2.
- the high-frequency heating device 1B includes a temperature detection section 70 and a height detection section 80.
- Control unit 60 controls position adjustment unit 20 and high-frequency power supply 30 based on information detected by temperature detection unit 70 and height detection unit 80 .
- a high-frequency heating device 1B has a first electrode 11B connected to a high-frequency power supply 30 via a matching section 40 instead of the first electrode 11A.
- the first electrode 11B is a flat plate-shaped electrode that is arranged in the heating chamber 13 and faces the second electrode 12 and parallel to the XY plane.
- a high frequency power supply 30 applies high frequency power between the first electrode 11B and the second electrode 12 .
- FIG. 10 is a schematic configuration diagram of the first electrode 11B in plan view, that is, when viewed from above along the Z axis. As shown in FIG. 10, the first electrode 11B includes a plurality of plate-like electrodes arranged in a lattice.
- the first electrode 11B includes 12 electrodes (divided electrodes 14E to 14P) arranged in 3 rows ⁇ 4 columns. Each split electrode is formed in a square shape with a side of 5 cm. A split electrode 14E is arranged at the left end of the deepest row. In this row, a split electrode 14F, a split electrode 14G, and a split electrode 14H are arranged in order on the right side of the split electrode 14E.
- a split electrode 14I is arranged at the left end of the central row.
- a split electrode 14J, a split electrode 14K, and a split electrode 14L are arranged in order on the right side of the split electrode 14I.
- a split electrode 14M is arranged at the left end of the frontmost row.
- a split electrode 14N, a split electrode 14O, and a split electrode 14P are arranged in order on the right side of the split electrode 14M.
- the number and arrangement of split electrodes are not limited to this.
- the 16 divided electrodes may be arranged in a grid of 4 rows ⁇ 4 columns.
- a plurality of segmented electrodes may be arranged radially.
- the shape of the split electrodes 14E to 14P is not limited to a square. Segmented electrodes 14E-14P may be rectangular, circular including elliptical, or polygonal other than square.
- the temperature detection unit 70 is installed at the center of the first electrode 11B.
- the temperature detection unit 70 has a plurality of infrared sensors and measures the temperature of the upper surface of the entire heated object 90 . If the detected temperature is significantly different from the temperature of the heating chamber 13 , the control section 60 can also detect the size of the object 90 to be heated from the information from the temperature detection section 70 .
- control unit 60 performs normal mode heating when the temperature of the object 90 to be heated is ⁇ 20° C. or higher, and performs protection mode heating when the temperature of the object 90 to be heated is less than ⁇ 20° C. I do.
- the heating in the protection mode prevents local overheating, and the entire object can be uniformly heated.
- the temperature detection unit 70 may have a plurality of infrared sensors arranged in a line. For example, when a plurality of infrared sensors are arranged in a row along the X-axis, the temperature of the entire heated object 90 can be measured by swinging the temperature detection unit 70 about the X-axis. In order to measure the temperature of the entire heated object 90 at once, the temperature detection section 70 may have a plurality of infrared sensors arranged in a lattice.
- the height detection unit 80 is installed on the side wall surface of the heating chamber 13 .
- the height detection unit 80 is a camera that photographs the object 90 to be heated along the X-axis or the Y-axis.
- the control unit 60 calculates the height of the object 90 to be heated from the captured image.
- the height of the object 90 to be heated is the dimension of the object 90 to be heated along the Z-axis.
- the control unit 60 causes the position adjustment unit 20 to adjust the distance between the object 90 to be heated and the first electrode 11B to 40 mm.
- the control unit 60 causes the position adjustment unit 20 to adjust the distance between the object 90 to be heated and the first electrode 11B to 30 mm.
- the control unit 60 causes the position adjustment unit 20 to adjust the distance between the object 90 to be heated and the first electrode 11B to 20 mm.
- the height detection unit 80 may be a phototube or the like other than a camera. A user may input the height of the object 90 to be heated via the operation unit 50 .
- the control unit 60 may detect the dimensions (width, depth, height) of the heated object 90 from the captured image.
- the user may input the dimensions (width, depth, height) of the object 90 to be heated via the operation unit 50 .
- the control unit 60 determines which split electrode among the first electrodes 11B (split electrodes 14E to 14P) supplies high-frequency power in the protection mode. can do.
- control unit 60 detects the dimensions (width, depth, height) of the object 90 to be heated from the photographed image of the object 90 to be heated.
- the control unit 60 determines to which split electrode the high-frequency power is supplied according to the dimensions of the object 90 to be heated. That is, the control unit 60 sets the range of electrodes to which high-frequency power is supplied.
- FIG. 11 is a schematic plan view showing the positional relationship between the object to be heated 90 and the first electrode 11B when viewed from above along the Z-axis.
- FIG. 12 is a list showing selectable heating courses and the operation of the high-frequency heating device in each heating course in the second embodiment.
- Control unit 60 determines a heating course according to the temperature and height of object 90 to be heated.
- the object to be heated 90 is frozen sashimi with a width of 150 mm and a depth of 100 mm.
- the operating environment of the high-frequency heating device 1B is 20°C
- the object to be heated 90 is assumed to be a frozen product.
- the control unit 60 determines the width and depth dimensions of the object to be heated 90 based on the minus temperature range detected by the temperature detection unit 70 .
- the control unit 60 determines heating conditions according to the temperature and height of the object 90 to be heated, for objects 90 to be heated having the same width and depth.
- the control unit 60 determines the heating conditions of normal mode, all split electrodes, high heating output (1000 W), and short time (5 minutes). do.
- the control unit 60 sets the heating mode to the protection mode when the height of the object 90 to be heated is 30 mm or more.
- the range of the first electrode 11B supplied with high frequency power is narrower than that in the normal mode. Moreover, the range is smaller than the object 90 to be heated.
- the higher the object 90 to be heated the more the first electrode 11B is moved away from the second electrode 12, the lower the heating output, and the longer the heating time than in the normal mode.
- the side of the object to be heated that is perpendicular to the first electrode 11B is likely to be overheated.
- the distance between the electrodes, the heating output, and the heating time as described above, it is possible to uniformly heat the object 90 while suppressing overheating.
- a temperature of less than -20°C is lower than the temperature in a general freezer. If the temperature of the object 90 to be heated is less than -20° C. and the height of the object 90 to be heated is less than 20 mm, the heating mode is set to the normal mode. If the height of the object 90 to be heated is 20 mm or more, the heating mode is set to the protection mode.
- the heating mode is more likely to be set to the protection mode than when the temperature of the object 90 to be heated is -20°C or higher.
- the distance between the first electrode 11B and the object 90 to be heated is set larger and the heating output is set lower than when the temperature of the object 90 to be heated is ⁇ 20° C. or higher.
- the electric field outside the heating range of the first electrode 11B is weaker than that inside the heating range of the first electrode 11B. Therefore, in the protection mode, the peripheral portion of the object 90 to be heated is often less heated than the central portion of the object 90 to be heated.
- the divided electrodes in contact with the peripheral portion of the object 90 to be heated may be heated after the heating by the divided electrodes in contact with the central portion of the object 90 to be heated is completed.
- the central portion of the object to be heated 90 is heated by split electrodes 14J and 14K.
- the peripheral portion of the object 90 to be heated is heated by the segmented electrodes 14E, 14F, 14G, 14H, 14I, 14L, 14M, 14N, 14O and 14P.
- the peripheral portion of the object 90 to be heated can be heated in the same manner as the central portion. can.
- control unit 60 causes the high-frequency power supply 30 to supply high-frequency power to the split electrodes facing a portion of the object 90 to be heated.
- control unit 60 does not supply the high-frequency power to the split electrodes facing other portions of the object 90 to be heated.
- control unit 60 causes the high-frequency power source 30 not to supply high-frequency power to the split electrodes facing a portion of the object 90 to be heated.
- control unit 60 supplies high-frequency power to the split electrodes facing other portions of the object 90 to be heated.
- the split electrodes facing a portion of the object 90 to be heated are the split electrodes 14J and 14K.
- the split electrodes facing other portions of the object 90 to be heated are split electrodes 14E, 14F, 14G, 14H, 14I, 14L, 14M, 14N, 14O, and 14P.
- the control unit 60 may reduce the heating output. Alternatively, the controller 60 may stop heating for a certain period of time. This operation may be applied only to the segmented electrodes corresponding to the portion of the object 90 to be heated whose temperature has increased, or may be applied to all the segmented electrodes. As a result, partial overheating can be prevented and the entire object to be heated 90 can be uniformly heated.
- the high frequency power supply 30 supplies high frequency power to both the first electrode 11B and the second electrode 12 .
- the second electrode 12 may be grounded and the high frequency power supply 30 may supply high frequency power only to the first electrode 11B.
- the first electrode 11B may be grounded, and the high frequency power supply 30 may supply high frequency power only to the second electrode 12 .
- the high-frequency power supply 30 may supply high-frequency power to one or both of the first electrode 11B and the second electrode 12.
- the high-frequency heating device according to the present disclosure can uniformly heat objects of all shapes with a simple configuration.
- the high-frequency heating device according to the present disclosure can be applied, for example, to cooking appliances such as thawing machines or cooking machines, or drying devices for foodstuffs or wood.
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- Electromagnetism (AREA)
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Abstract
Description
保護モードにおいて、制御部は、高周波電源に、被加熱物の一部分に対向する分割電極に高周波電力を供給させる。一方、制御部は、被加熱物の他の部分に対向する分割電極に高周波電力を供給させない。
本開示の実施の形態1に係る高周波加熱装置1Aについて説明する。図1は、実施の形態1に係る高周波加熱装置1Aを模式的に示すブロック構成図である。
本開示の実施の形態2に係る高周波加熱装置1Bについて説明する。実施の形態2では、主に実施の形態1との相異点について説明する。実施の形態2において、実施の形態1と同一または同等の構成に対して同じ符号を付し、重複する記載を省略する。
11A、11B 第1電極
12 第2電極
13 加熱室
14A、14B、14C、14D、14E、14F、14G、14H、14I、14J、14K、14L、14M、14N、14O、14P 分割電極
20 位置調整部
30 高周波電源
31 高周波発振器
32、33 増幅器
40 整合部
50 操作部
60 制御部
70 温度検知部
80 高さ検知部
90 被加熱物
Claims (9)
- 加熱室と、
前記加熱室内に配置された第1電極と、
前記加熱室内に配置されて前記第1電極に対向する第2電極と、
高周波電力を発生するように構成された高周波電源と、
前記高周波電源を制御するように構成された制御部と、を備え、
前記制御部は、前記高周波電源に、前記第1電極および前記第2電極の間に前記高周波電力を印加させて、前記第1電極および前記第2電極の間に載置された被加熱物の加熱を制御するように構成され、
前記制御部は、前記被加熱物の全体に対する通常モードでの前記加熱と、前記被加熱物の局所的な過加熱を抑制する保護モードでの前記加熱と、を選択的に行うように前記高周波電源を制御することが可能である、高周波加熱装置。 - 前記第1電極は複数の分割電極を含み、
前記保護モードにおいて、前記制御部は、前記高周波電源に、前記複数の分割電極のうちの、前記被加熱物の一部分に対向する分割電極に前記高周波電力を供給させ、前記被加熱物の他の部分に対向する分割電極に前記高周波電力を供給させない、請求項1記載の高周波加熱装置。 - 前記保護モードにおいて、前記制御部は、前記高周波電源に、前記被加熱物の前記一部分に対向する前記分割電極に前記高周波電力を供給させ、前記被加熱物の前記他の部分に対向する前記分割電極に前記高周波電力を供給させず、
続けて、前記制御部は、前記高周波電源に、前記被加熱物の前記一部分に対向する前記分割電極に前記高周波電力を供給させず、前記被加熱物の前記他の部分に対向する前記分割電極に前記高周波電力を供給させる、請求項2に記載の高周波加熱装置。 - 前記第1電極と前記第2電極との間の距離を調整するように構成された位置調整部をさらに備えた、請求項1に記載の高周波加熱装置。
- 前記保護モードにおいて、前記位置調整部は、前記通常モードの場合よりも前記第1電極を前記被加熱物から遠ざける、請求項4に記載の高周波加熱装置。
- 前記保護モードにおいて、前記制御部は、前記高周波電源に、前記通常モードの場合よりも単位時間あたりの加熱出力が小さい前記高周波電力を発生させる、請求項1に記載の高周波加熱装置。
- 前記加熱室内に配置されて、前記被加熱物を撮影するように構成されたカメラをさらに備え、
前記制御部は、前記カメラにより撮影された前記被加熱物の画像から前記被加熱物の寸法を検知する、請求項1に記載の高周波加熱装置。 - 前記被加熱物の温度を検知するように構成された温度検知部をさらに備えた、請求項1に記載の高周波加熱装置。
- 使用者による前記通常モードの選択と前記保護モードの選択とを入力するように構成された操作部をさらに備えた、請求項1に記載の高周波加熱装置。
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