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WO2009130761A1 - Appareil de chauffage par induction, générateur d'air chaud et appareil de séchage des mains - Google Patents

Appareil de chauffage par induction, générateur d'air chaud et appareil de séchage des mains Download PDF

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Publication number
WO2009130761A1
WO2009130761A1 PCT/JP2008/057743 JP2008057743W WO2009130761A1 WO 2009130761 A1 WO2009130761 A1 WO 2009130761A1 JP 2008057743 W JP2008057743 W JP 2008057743W WO 2009130761 A1 WO2009130761 A1 WO 2009130761A1
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WIPO (PCT)
Prior art keywords
coil
heating plate
induction heating
heating
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2008/057743
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English (en)
Japanese (ja)
Inventor
貞行 松本
史和 松浦
喜久夫 泉
一成 中尾
郁朗 菅
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to PCT/JP2008/057743 priority Critical patent/WO2009130761A1/fr
Priority to JP2010508991A priority patent/JP5106628B2/ja
Publication of WO2009130761A1 publication Critical patent/WO2009130761A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • 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
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid

Definitions

  • the present invention relates to an induction heating apparatus that heats a fluid such as a gas or a liquid using induction heating.
  • a coil is formed by winding a lead wire such as a litz wire around the outer periphery of a cylindrical case made of a non-magnetic material such as ceramic, and a heating element is provided inside the cylindrical case.
  • the heating element is inductively heated by flowing a high-frequency current through the coil, and the fluid is heated by passing the fluid through the inside of the case in which the heating element is stored (Patent Document 1, FIG. 1).
  • the heating element is formed by alternately laminating a flat first sheet and a corrugated second sheet made of SUS447J1 defined in JIS (Japanese Industrial Standard) standard of ferritic stainless steel having magnetism.
  • the induction heating apparatus configured as described above, when a high-frequency current is passed through the coil, the sheet material is laminated so as to have a space and can be electrically conducted, and the current crossing the peripheral portion from the current along the peripheral portion. Is formed in a shape that facilitates flow, so that a heat transfer area can be secured, and the heating element in the central part inside the case generates more heat than the peripheral part. Since the fluid passing through the case flows more easily in the central portion than in the peripheral portion, it is uniformly heated by the heating element that generates heat in the central portion.
  • Patent Document 2 discloses an induction heating device that heats a metal pan by induction heating for the purpose of cooking.
  • the buoyancy generated when a pan made of a material having a high electrical conductivity such as aluminum or copper is heated by induction heating in order to make the temperature at the bottom of the pan uniform or reduced.
  • a conductive plate in which six slits are radially formed from the center hole to the peripheral part between a coil for induction heating and a SUS-based magnetic container that is an object to be heated. Is used.
  • One of the slit portions is connected to the outer peripheral edge of the conductive plate. In such a configuration, when a high-frequency current is passed through the induction heating coil, the induction current flows in the direction around the conductive plate. However, the induction current is blocked by the slit connecting the outer peripheral edge and the center hole, and is used for induction heating.
  • the direction is changed in the same direction as the high-frequency current flowing in the coil, and flows along a slit that is not connected to the center hole and the outer peripheral edge.
  • the induction current near the center of the conductive plate flows in the same direction as the high-frequency current flowing through the induction heating coil, the magnetic field near the center of the conductive plate is strengthened, and the temperature difference in each part of the bottom surface of the heated object is reduced. .
  • Patent Document 3 discloses an induction heating device that induction-heats an object to be heated made of aluminum, copper, or a low magnetic permeability material having an electric conductivity equal to or higher than that for cooking.
  • an electric conductor such as aluminum is provided between a heating coil for induction heating and an object to be heated.
  • an induction current is generated in both, and the magnetic field generated by the induction current induced in the electric conductor and the object to be heated are heated.
  • An induced current flows through the electric conductor and the object to be heated so that a superimposed magnetic field of the magnetic field generated by the current induced in the object prevents a change in the magnetic field generated by the heating coil.
  • the change in the current distribution increases the equivalent series resistance of the heating coil and obtains the same output.
  • the current value flowing through the heating coil can be reduced, the buoyancy acting on the object to be heated is reduced, and the electric conductor acts on the object to be heated by sharing a part of the buoyancy acting on the object to be heated. The buoyancy is reduced.
  • the induction heating device disclosed in Patent Document 2 or 3 is not designed to heat a fluid such as a gas or a liquid in the first place, and therefore cannot efficiently heat the fluid. Also, even if it is used for fluid heating, the amount of heat generated by the electrical conductor provided between the coil for induction heating and the object to be heated is suppressed as small as possible, and the temperature distribution of the object to be heated is made uniform or efficiently heated. In order to do this, the electrical conductor is provided with slits, so in terms of the heat transfer area for fluid heating, the main heat transfer surface is a heated object such as a pan bottom, and the electric conductor is almost the heat transfer surface. It does not contribute.
  • the present invention has been made to solve the above-described problems, and an induction heating apparatus that can increase the heat transfer area with a simple structure and efficiently heat a fluid such as a gas or a liquid. It is intended to be realized.
  • An induction heating apparatus includes a coil and a nonmagnetic conductor, and includes at least one first heating plate that forms a flow path between the coil and the conductor, A second heating plate that forms a flow path between the first heating plate and a high-frequency power source that supplies a high-frequency current to the coil, wherein the first heating plate has a direction of magnetic flux generated by the coil; It has a slit extending in substantially the same direction.
  • the present invention since the magnetic flux that has passed through the slit of the first heating plate reaches the second heating plate arranged on the outer side, all the heating plates are induction-heated to increase the heat transfer area. Thus, the present invention has a remarkable effect that the fluid can be heated.
  • FIG. 1 It is a perspective view of the induction heating apparatus of Embodiment 1 which concerns on this invention. It is a disassembled perspective view of the induction heating apparatus shown in FIG. (A) And (b) is the top view and sectional drawing of a coil shown in FIG. 1, Comprising: The direction of the magnetic flux produced from a coil is shown.
  • (A) is a perspective view of the first heating plate shown in FIG. 1
  • (b) to (c) are cross-sectional views of the induction heating device shown in FIG. 1, showing the state of magnetic flux. It is side surface sectional drawing of the warm air generator using the induction heating apparatus shown in FIG. It is a perspective view of the perforation heating plate used as a comparative example of the first heating plate.
  • FIG. 6 is a perspective view of an induction heating device according to a modification of the second embodiment.
  • FIG. FIG. 10 is a perspective view of an induction heating device according to another modification of the second embodiment. It is a perspective view of the induction heating apparatus by Embodiment 3 which concerns on this invention. It is a disassembled perspective view of the induction heating apparatus shown in FIG. It is a perspective view of the induction heating apparatus by Embodiment 4 which concerns on this invention. It is side surface sectional drawing of the hand-drying apparatus by Embodiment 5 which concerns on this invention. It is a block diagram which shows the circuit structure of the power supply device used for the hand dryer shown in FIG.
  • FIG. 10 is a perspective view of an induction heating device according to a modification of the sixth embodiment. It is sectional drawing of the induction heating apparatus shown in FIG. It is a disassembled perspective view of the induction heating apparatus by Embodiment 7 which concerns on this invention.
  • FIG. 10 is a cross-sectional view of an induction heating device according to a modification of the seventh embodiment. It is a disassembled perspective view of the coil by Embodiment 8 which concerns on this invention. It is sectional drawing of the coil shown in FIG.
  • induction heating device 10: flat coil, 11: support plate, 12: insulating case, 14: coil case (metal case), 18: cylindrical coil, 20: first heating plate, 21: slit, 22 : Outer end (coil), 23: outer periphery (first heating plate), 26: partition plate, 30: second heating plate, 32: cylindrical case, 40: spacer, 50: power supply device, 100: warm Wind generator, 101: air inlet, 102: jet outlet, 103: duct, 104: blower, 200: hand dryer, 202: housing, 203: duct, 204: blower, 206: hand insertion section, 208: air inlet , Ejection port (ejection nozzle), 210: electrical wiring, 212: ejection port (ejection nozzle), 250: power supply device, 252: switching element, 254: half-bridge circuit, 256: DC power supply, 258: half-blur Jidoraiba, 260: control unit, 300: hand dryer, 303: Duct, P: passage
  • FIG. 1 is a perspective view showing an induction heating device 1 according to Embodiment 1 of the present invention
  • FIG. 2 is an exploded perspective view of the induction heating device 1 of FIG.
  • the induction heating device 1 according to the first embodiment is roughly composed of a flat coil 10 formed in an arbitrary plane shape (circular shape in FIG. 2) by winding a conductive wire such as an enamel wire in a spiral shape, and on both sides thereof.
  • a pair of first heating plates 20 disposed with a predetermined space separated by a spacer 40 and a pair of second heating plates 30 disposed with a predetermined space separated by a spacer 40 in a direction away from the coil 10.
  • FIG. 1 is a perspective view showing an induction heating device 1 according to Embodiment 1 of the present invention
  • FIG. 2 is an exploded perspective view of the induction heating device 1 of FIG.
  • the induction heating device 1 according to the first embodiment is roughly composed of a flat coil 10 formed in an arbitrary plane shape (circular shape in FIG. 2) by wind
  • the flat coil 10 is illustrated as being fixed to a plate-like support plate 11, but may be disposed inside an insulating case 12 made of an insulator such as resin or ceramics. However, it is also possible to construct the flat coil 10 that can stand on its own without using the support plate 11 by insulating and connecting the wound conductors (see FIG. 5).
  • the pair of first heating plates 20 is made of nonmagnetic austenitic stainless steel
  • the pair of second heating plates 30 is made of magnetic ferritic stainless steel.
  • the constituent material of the first heating plate 20 may be a conductor material that is not a ferromagnetic material, and is preferably made of a material having a large volume resistivity, and more preferably Austenitic stainless steel SUS304 may be used as a mass-produced and inexpensive product.
  • the constituent material of the second heating plate 30 may be the same as the constituent material of the first heating plate 20 or may be a nonmagnetic material (nonmagnetic austenitic stainless steel), but preferably Is a ferromagnetic metal such as ferritic stainless steel or marsanto stainless steel, and SUS430, a magnetic ferritic stainless steel, is most suitable from the viewpoint of low cost.
  • the first heating plate 20 of the first embodiment has a plurality of slits 21 extending radially from the center.
  • the slits 21 do not need to intersect at the center as shown in the figure, and may be independent from each other, but their inner ends are radially inward from the inner periphery of the coil 10 and their outer ends 22 are the first ones. It is configured not to reach the outer peripheral portion 23 of the heating plate 20. That is, the outer peripheral portion 23 of the first heating plate 20 is continuous in the circumferential direction without being divided by the slit 21, and the circumferential high-frequency current generated in the first heating plate 20 is caused by the slit 21 as described later.
  • the first heating plate 20 can flow uniformly throughout the first heating plate 20 without being blocked, and the first heating plate 20 can be heated sufficiently and uniformly.
  • the insulating case 12 including the coil 10, the pair of first heating plates 20, the pair of second heating plates 30, and the spacer 40 each have a plurality of screw holes at corresponding positions, and a plurality of screws ( These components are fixed together using an unillustrated).
  • a predetermined interval corresponding to the thickness of the spacer 40 is provided between the insulating case 12 and the first heating plate 20 and between the first heating plate 20 and the second heating plate 30.
  • a flow path P through which a fluid such as gas or liquid heated by these heating plates 20 and 30 flows is formed.
  • the upper and lower ends of the insulating case 12 that houses the coil 10 are opened (not shown) to form a flow path through which the fluid flows also in the insulating case 12, so that the coil 10 in the insulating case 12 is also Similarly, it is preferable to cool with a fluid. However, in order to prevent deterioration of the coil 10 due to exposure to the fluid, the flow path does not have to be formed inside the insulating case 12. Further, both ends of the coil 10 are electrically connected to the power supply device 50, whereby a high frequency current is supplied.
  • FIG. 3A and FIG. 3B conceptually show the state of the magnetic flux of the high-frequency magnetic field formed when a high-frequency current is passed through the coil 10.
  • the magnetic flux B is generated radially (in the radial direction) from the inner peripheral side to the outer peripheral side of the coil 10 on the surface side of the coil 10 as shown in FIG. 3A, and the coil 10 as shown in FIG.
  • the magnetic flux B is generated in a direction orthogonal to the conducting wire of the coil 10 according to the right-handed screw law.
  • the direction of the magnetic flux is also reversed depending on the polarity of the high frequency current.
  • FIG. 3B shows that the magnetic flux has a start point and an end point, this is for explanation, and as is clear from the Maxwell equation, the magnetic flux is continuous and there is no start point or end point. .
  • FIG. 4 (a) is a perspective view of the first heating plate 20 having the slits 21, and FIGS. 4 (b) and 4 (c) show the bb line and cc of FIG. 4 (a), respectively.
  • the slit 21 of the first heating plate 20 is not formed, and the magnetic flux generated in the coil 10 reaches the first heating plate 20, and the first heating plate 20 generates an induced current.
  • An eddy current flows to inductively heat the first heating plate 20.
  • the second heating plate 30 cannot be reached (a part of the magnetic flux may pass through the first heating plate 20).
  • a slit 21 is formed in the first heating plate 20, and the magnetic flux generated in the coil 10 reaches the second heating plate 30, and the second heating plate 30 An eddy current flows as the induced current, and the second heating plate 30 is induction-heated.
  • a total of four heating plates 20 and 30 including a pair of first heating plates 20 and a pair of second heating plates 30 generate heat by induction heating, and flow paths
  • a fluid such as gas or liquid
  • the front and back surfaces of the respective heating plates 20 and 30 become heat transfer surfaces, so that heat is transferred to the fluid from a total of eight heat transfer surfaces, and the fluid is heated.
  • the coil 10 also generates heat due to Joule heat (so-called copper loss) due to its own resistance, but the inside of the insulating case 12 (that is, the front surface and the back surface of the coil 10) is also configured as a flow path.
  • heat can be efficiently transferred to the fluid, and the coil 10 can be sufficiently cooled by the fluid. Even when the coil 10 is completely covered with the insulating case 12, since the outside of the insulating case 12 is a flow path, the heat generated in the coil 10 can be transferred to the fluid through the insulating case 12.
  • the 1st heating plate 20 which has the slit 21 concerning this invention consists of a nonmagnetic metal plate
  • an induction heating apparatus was produced using the 1st heating plate 20 which consists of a magnetic metal plate.
  • An experiment was conducted to confirm the influence of the second heating plate 30 on the temperature increase. That is, instead of the austenitic stainless steel plate SUS304, the induction heating apparatus 1 incorporating the first heating plate 20 provided with the slit 21 in the same manner in the ferritic stainless steel plate SUS430 is operated under the same conditions. Although the plate 20 was induction heated, the second heating plate 30 was not induction heated.
  • the first heating plate 20 is preferably composed of a nonmagnetic metal plate rather than a magnetic metal plate.
  • the heat generating element described in Patent Document 1 is configured such that a sheet made of SUS447J1 made of ferritic stainless steel having magnetism is laminated so that the whole can be energized by spot welding, it is separated from the coil. Inductive current also flows through the sheet to generate heat, but if each sheet is not energized, only the sheet near the coil generates heat by induction heating, and the sheet away from the coil is not induction heated, so the heat transfer area is increased. I can't do it. In other words, in order to generate heat from the sheet away from the coil, each sheet must be spot-welded so that it can be energized as a whole.
  • the first heating plate 20 close to the coil 10 is configured as a non-magnetic metal plate provided with the slit 21, so that the magnetic flux transmitted through the slit 21 is from the coil 10. Even if the first and second heating plates 20 and 30 are not electrically connected, the second heating plate 30 as well as the first heating plate 20 can be connected to the second heating plate 30 that is far away. Induction heating is possible. That is, according to the induction heating apparatus 1 according to the present invention, since a plurality of heating plates 20 and 30 need only be arranged at predetermined positions without using a special manufacturing process such as spot welding, the manufacturing cost is extremely high. It can be kept low.
  • FIG. 5 is a cross-sectional view showing a schematic configuration of the hot air generator. 5 may be a hand dryer.
  • a hot air generator 100 shown in FIG. 5 includes a duct 103 that fluidly communicates between the air inlet 101 and the jet outlet 102, the induction heating device 1 (FIG. 1) disposed inside the duct 103, a duct, A blower 104 that forms a fluid flow F in the inside 103 and a high-frequency power source 50 are provided.
  • the hot air generator 100 has a control circuit (not shown) for controlling the driving conditions of the high-frequency power supply 50.
  • the coil 10 of the induction heating apparatus 1 is formed by winding a 0.75 mm diameter enamel wire in a spiral shape to form a disk shape having a diameter of 140 mm, and then a nomex paper (DuPont, registered as a heat-resistant paper on the front and back surfaces). And is laminated in a rectangular case 12 having a planar size of 160 mm ⁇ 150 mm.
  • the first heating plate 20 is a non-magnetic stainless steel plate of SUS304 having a planar size of 160 mm ⁇ 150 mm and a thickness of 65 mm ⁇ width 1 mm (eight) extending radially from the center as shown in FIG. ) Slits are separated from each other at an angle of 45 °.
  • the second heating plate 30 is a SUS430 magnetic stainless steel plate having a thickness of 2 mm and a planar dimension of 160 mm ⁇ 150 mm.
  • the spacer 40 is a 150 mm ⁇ 5 mm ⁇ 3 mm SUS304 nonmagnetic stainless steel member, and has a space of 3 mm between the rectangular case 12 and the first heating plate 20 and between the first and second heating plates 30.
  • the rectangular case 12 and the first and second heating plates 20 and 30 are fixed integrally with each other by using any suitable fixing means such as screws.
  • the induction heating apparatus 1 according to Embodiment 1 is configured.
  • the induction heating apparatus 1 and the duct 103 are designed so that the distance between the second heating plate 30 and the inner wall of the duct 103 is similarly 3 mm.
  • the high-frequency power supply 50 that supplies a high-frequency current to the coil 10 will be described later, but may have any form generally used in an induction heating device, and is constituted by, for example, a resonant capacitor and two switching elements. It may be a half-bridge type inverter.
  • the hot air generator 100 configured in this manner, when a high frequency current is supplied from the high frequency power supply 50 to the induction heating device 1 and the blower 104 is driven, the air sucked from the air inlet 101 of the blower 104 is converted into the induction heating device. 1 and is discharged from the outlet 102 as warm air.
  • the electric energy input to the induction heating device 1 is converted into heat energy by the induction heating device 1, and this heat energy warms the air and also the duct 103 or the blower 104 or the like. Heat is transferred to peripheral parts by convection, conduction, and radiation. Therefore, most of the electric energy input to the induction heating device 1 is finally transferred to the air. Therefore, the temperature of the air discharged from the hot air generator 100 is measured, and the first of the induction heating device 1 is measured. It is difficult to evaluate the heat transfer performance with respect to the first and second heating plates 20 and 30.
  • the case 12 and the duct 103 adjacent to the first and second heating plates 20 and 30 are formed using a constituent material having heat resistance or flame retardancy. There is a need. Designing the hot air generator 100 so that some components do not become abnormally high is extremely preferable from the viewpoint of suppressing an increase in manufacturing cost. Therefore, it is preferable that the heat generated from the induction heating device 1 is more uniformly transferred to the first and second heating plates 20 and 30.
  • a high frequency current having a frequency of 20 kHz is supplied to the coil 10 with a power of 400 W, and the jet outlet 102 of the blower 104 is controlled to discharge air of 1.1 m 3 / min. , raised the temperature T C of the coil 10 to the intake air temperature (the surface of the conductor), raised the temperature T 1 of the first heating plate 20 (the average of the two), raised the temperature of the second heating plate 30 (the average of the two) T 2, and to a raised temperature T D of the inner surface of the duct 103, respectively to obtain the results as follows.
  • the measurement position is a position 3 cm outside the center of the first heating plate 20, and the measurement positions of the coil 10, the second heating plate 30, and the duct 103 are also the first heating plate. This is a position corresponding to the measurement position of the plate 20.
  • the first and second heating plates 20 and 30 have substantially the same rising temperature T 1 and T 2 and are almost uniformly induction-heated by the high-frequency current flowing through the coil 10. It was.
  • a hot air generator using a first heating plate 20 in which circular holes 24 are arranged in a grid pattern as shown in FIG. 6 (hereinafter referred to as “perforated heating plate 25”).
  • perforated heating plate 25 a hot air generator using a first heating plate 20 in which circular holes 24 are arranged in a grid pattern as shown in FIG. 6
  • perforated heating plate 25 the same measurement as described above was performed.
  • nonmagnetic stainless steel SUS304 having a thickness of 1 mm and circular holes 24 having a diameter of 8 mm and 6 mm arranged in a grid are prepared and incorporated in the hot air generator 100.
  • the opening ratio of the circular holes 24 to the perforated heating plate was about 58% and about 40%, respectively.
  • the eight slits 21 having a length of 65 mm and a width of 1 mm extending radially from the center are provided in the first heating plate 20 shown in FIG. is there.
  • the second heating plate 30 has a very high temperature regardless of the aperture ratio. Not. That is, the magnetic flux B from the coil 10 does not pass through the first heating plate 20 even if many circular holes 24 are provided, and does not reach the second heating plate 30.
  • the second heating plate 30 is the second heating plate 30 even though the aperture ratio due to the slit 21 when the slits 21 are provided in the first heating plate 20 is relatively small at about 2.2%.
  • the slit 21 extending in the same direction as the direction of the magnetic flux has an extremely large influence on the effect of transmitting the magnetic flux B as compared with the circular hole 24 since It can be seen that the effect of increasing the heat transfer area according to the invention acts remarkably.
  • a nonmagnetic stainless steel SUS304 having a thickness of 1 mm and circular holes 24 having a diameter of 8 mm, 6 mm, and 3 mm arranged in a lattice shape is further added to the perforated heating plate 25 and the length extending radially from the center.
  • a device provided with eight slits 21 of 65 mm ⁇ width 1 mm was manufactured, and the same measurement as described above was performed in the hot air generator 100 using this as the first heating plate 20.
  • the slit 21 according to the present invention is used, and the aperture ratio of the circular holes 24 is about 58%, about 40%, and about 33% (the perforated heating plate 25 having a circular hole with a hole diameter of 3 mm) 3.
  • the coil rising temperature T C the first heating plate rising temperature T 1 , the second heating plate rising temperature T 2 , and the duct surface rising temperature with respect to the intake air temperature of the fluid flow F It was measured T D.
  • the aperture ratio does not include the aperture ratio due to the slit 21, and the first heating plate 20 that does not have the circular holes 24 and has only the slits 21 has the aperture ratio of 0%.
  • the same measurement was performed (Table 3). And the graph of FIG. 7 was obtained by plotting each rising temperature in each aperture ratio.
  • the rising temperature T1 of the first heating plate 20 becomes lower and the rising temperature T2 of the second heating plate 30 becomes higher. Therefore, by controlling the aperture ratio of the circular holes 24 provided in the first heating plate 20, the rising temperatures T 1 and T 2 of the first and second heating plates 20 and 30 can be controlled. Alternatively, the rising temperatures T 1 and T 2 of the first and second heating plates 20 and 30 can be controlled by the number and width of the slits 21 provided in the first heating plate 20. Since the rising temperatures T 1 and T 2 of the first and second heating plates 20 and 30 can be controlled by controlling the aperture ratio of the circular holes 24 provided in the first heating plate 20, However, there is an advantage that the degree of freedom of design increases.
  • each aperture ratio, elevated temperature T 2 of the temperature increase T 1, the second heating plate 30 of the rise of the coil with respect to the intake air temperature of the fluid flow F temperature T C, the first heating plate 20, and the duct 103 is a graph plotting the respective measurement results of the temperature increase T D of the surface of the.
  • the rising temperatures T 1 and T 2 of the first and second heating plates 20 and 30 are approximately the same, and both the heating plates 20 and 30 are equally induction-heated,
  • the rising temperature T C of the coil 10 is higher than the rising temperatures T 1 and T 2 of the first and second heating plates 20 and 30.
  • peripheral parts such as the case 12 that accommodates the coil 10 must be formed using a material having a higher heat-resistant temperature. it is preferable to suppress the temperature increase T C of the coil 10.
  • the upper end and the lower end of the case 12 including the coil 10 are opened to form a flow path through which the fluid flows also inside the case 12, and the coil 10 is cooled by the fluid, and from the aluminum plate Rather, it is more preferable to configure the first heating plate 20 using a nonmagnetic stainless steel plate.
  • the reason for the coil 10 becoming higher temperature is that the resistance of the aluminum plate is smaller than the resistance of the SUS304 stainless steel plate, so that the coil 10 of the induction heating apparatus 1 is used. This is because the resistance component induced in the first heating plate 20 when a high-frequency current is passed through is small, and the ratio of the power consumed by the coil 10 is large.
  • the impedance measurement of the induction heating device 1 when the first heating plate 20 is a SUS304 stainless steel plate, about 6 to 7% of the input power is consumed by the coil 10, but in the case of an aluminum plate, About 20% of power is consumed by the coil 10.
  • the resistance of the first heating plate 20 may be increased.
  • a material having a large volume resistivity may be used or the plate thickness may be reduced.
  • the volume resistivity of the SUS304 stainless steel plate at room temperature is 71 ⁇ 10 ⁇ 8 ⁇ m
  • the volume resistivity of the aluminum plate is 2.75 ⁇ 10 ⁇ 8 ⁇ m.
  • Non-magnetic metal and high volume resistivity materials include nichrome (110 ⁇ 10 ⁇ 8 ⁇ m), chromel (70 to 100 ⁇ 10 ⁇ 8 ⁇ m), constantan (47 to 51 ⁇ 10 ⁇ 8 ⁇ m), although these may be used, austenitic stainless steel is optimal as a material that can be obtained at low cost.
  • Austenitic stainless steel has a volume resistivity of 71 to 94 ⁇ 10 ⁇ 8 ⁇ m at room temperature.
  • the plate thickness is reduced, the resistance of the aluminum plate can be increased even with a material having a small volume resistivity such as aluminum.
  • the plate thickness is 0.1 mm or less, the resistance of the aluminum plate is sufficiently large and the power consumed by the coil 10 can be sufficiently reduced.
  • the plate thickness is thin, it is easily deformed by heat generated by induction heating. Become. Therefore, a design that allows for deformation of the aluminum plate is required.
  • the use of aluminum which is cheaper than stainless steel, is advantageous in terms of cost reduction. Even if the plate thickness is set to 0.1 mm or more and the power consumed by the coil 10 is slightly increased, the periphery of the coil 10 is a flow path. This is possible because it is cooled.
  • the first heating plate 20 is a SUS304 nonmagnetic stainless steel plate having a thickness of 160 mm ⁇ 150 mm and a SUS304 thickness of 65 mm ⁇ 1 mm wide extending radially from the center as shown in FIG.
  • a plurality of (eight) slits are formed so as to be separated from each other at an angle of 45 °, and the circular hole 24 is not provided. Table 4 shows the measurement results.
  • the specific geometrical values have been described, but the dimensions of the heating plates 20 and 30, the coil 10, and the spacer 40 are not limited to this. If a similar structure is realized, a space serving as the flow path P may be formed without using the spacer 40 and without using the spacer 40 by bending the ends of the heating plates 20 and 30. In addition, although two each of the first heating plate 20 and the second heating plate 30 are provided on both surfaces of the coil 10, the first heating plate 20 and the second heating plate 30 are provided on one surface of the coil 10. May be.
  • Embodiment 2 of the induction heating apparatus according to the present invention will be described with reference to FIGS.
  • the induction heating device 2 according to the second embodiment has the same configuration as that of the first embodiment except that a plurality of first heating plates 20 are provided on both sides of the coil 10. Description is omitted.
  • FIG. 9 is a perspective view showing the induction heating device 2 according to the second embodiment of the present invention.
  • the induction heating device 2 of the second embodiment includes a first heating plate 20a made of nonmagnetic austenitic stainless steel disposed on both sides of a case 12 that houses the coil 10 (FIG. 10 (a)), and on the outside thereof. It has another 1st heating plate 20b which consists of the material of the equivalent nonmagnetic material arrange
  • the first heating plate 20a closer to the coil 10 is formed so that twelve slits of 65 mm in length and 1 mm in width extending radially from the center are separated from each other at an angle of 30 °.
  • the first heating plate 20b disposed further away from the coil 10 has six slits of 65 mm in length and 1 mm in width extending radially from the center as shown in FIG. It is formed so as to be separated by an angle of °.
  • the slit 21b of the first heating plate 20b arranged on the outer side is formed so as to overlap (superimpose) the slit 21a of the first heating plate 20a arranged on the inner side when viewed from the direction perpendicular to the first heating plate 20a. ing.
  • FIGS. 10 (a) and 10 (b) are cross-sectional views of the induction heating device 2 as viewed from the aa, bb, and cc lines in FIGS. 10 (a) and 10 (b). It is.
  • the first heating plate 20 a disposed on the inner side cannot transmit the magnetic flux B in the absence of a slit and is induction-heated by the magnetic flux from the coil 10.
  • the first heating plate 20b arranged outside cannot transmit the magnetic flux B in the absence of the slit 21b, and the slit 21a of the first heating plate 20a arranged inside. Inductive heating is performed by the magnetic flux B transmitted through the.
  • the second heating plate 30 is induction-heated by the magnetic flux transmitted through the slits 21a, 21b of both the first heating plates 20a, 20b.
  • the induction heating apparatus 2 configured in this way, by providing the slits 21a and 21b in the first heating plates 20a and 20b, all the heating plates 20a, 20b and 30 can be induction-heated, and the heat transfer area Can be further increased. Further, by making the width of the slit 21a of the first heating plate 20a arranged on the inner side wider than the width of the slit 21b provided on the first heating plate 20b arranged on the outer side, the magnetic flux is surely applied to the second heating plate 30. You may make it reach.
  • the same number of slits 21 are provided on the first heating plate 20a arranged on the inner side and the first heating plate 20b arranged on the outer side so as to overlap each other, and the width of the former slit 21a is formed wider than that of the latter slit 21b.
  • a part of the magnetic flux B transmitted through the slit 21a of the first heating plate 20a induces and heats the first heating plate 20b, and the remaining magnetic flux B passes through the first heating plate 20b and passes through the second heating plate 30. May be induction heated.
  • the induction heating device 2 having the two first heating plates 20a and 20b arranged inside and outside the coil 10 and the second heating plate 30 has been described. Since it reaches 10 to several centimeters, more first heating plates 20 may be provided.
  • FIG. 12 is a perspective view showing an induction heating device 2 having four first heating plates 20 on both sides of the coil 10 and a second heating plate 30 on the outside thereof.
  • a larger number of first heating plates 20 can be arranged to realize a larger heat transfer area.
  • the first heating plate 20 disposed on the outer side is farther away from the coil 10, so that the magnetic flux from the coil 10 becomes weaker and the induction heating becomes difficult. . Therefore, as shown in FIG. 13, a plurality of first heating plates 20 may be induction-heated using a plurality of coils 10.
  • the width of the slit 21 so that each of the first heating plates 20 is heated evenly, but the plurality of first heating plates so that the slit widths are different (different shapes). Since the formation of the plate 20 causes high costs, it is preferable to use the induction heating device 2 by using the first heating plate 20 having the same shape as much as possible in order to manufacture the plate 20 at a low cost.
  • the rising temperature (T 1 ) varies depending on the distance from the coil 10 to each of the first heating plates 20, but the heated fluid generates the above-described hot air.
  • the fluid that is agitated inside the main body device such as the device 100 and ejected from the main body device has a uniform temperature, and there is often no problem in actual use.
  • the second heating plate 30 is arranged on the outermost side.
  • the first heating plate 20 is used. It may be replaced.
  • Embodiment 3 of the induction heating apparatus according to the present invention will be described with reference to FIGS.
  • the induction heating device 3 of the third embodiment is the same as that of the second embodiment except that the first heating plate 20a and the second heating plate 30 disposed inside are provided with undulations (unevenness) to increase the heat transfer area. Since the configuration is the same as that in FIG.
  • the induction heating device 3 shown in FIGS. 14 and 15 has a case 12 that houses the coil 10 and a nonmagnetic metal plate (for example, a metal plate made of SUS304) bent into a corrugated shape (provided with irregularities).
  • a nonmagnetic metal plate for example, a metal plate made of SUS304
  • a second heating plate 30 provided with continuous undulations by bending the metal plate) into a corrugated shape.
  • the first heating plates 20a and 20b and the second heating plate 30 are induction-heated as in the first and second embodiments.
  • the first heating plate 20a and the second heating plate 30 arranged inside are formed in a continuous corrugated shape, and compared with a flat metal plate, the contact area with the fluid (transmission) The heat transfer effect can be improved because the heat area can be increased.
  • the first heating plate 20a having a corrugated shape disposed inside and the second heating plate 30 having the corrugated shape fix the coil 10.
  • the induction heating device 3 does not require a spacer as a separate member in order to form the flow path.
  • the flat metal plate When the temperature of the corrugated metal plate rises due to heating, the flat metal plate may thermally expand and warp larger than the corrugated metal plate in its parallel plane, making it difficult to maintain the flow path in a stable shape. Accordingly, the flat support plate 11, the first heating plates 20a and 20b, and the second heating plate 30 that fix the coil 10 are not fixed via the spacer 40, as shown in FIGS. It is desirable to construct so that it is simply laminated. More preferably, the first heating plate 20b having a flat plate is formed using an insulator that does not easily thermally expand so that the first heating plate 20a and the second heating plate 30 that are corrugated metal plates do not warp. May be. However, the flat first heating plate 20b is preferably formed using a nonmagnetic metal material rather than an insulator because the heat transfer area can be increased.
  • FIG. 16 is a perspective view showing an induction heating device 4 according to Embodiment 4 of the present invention.
  • the induction heating device 4 according to the fourth embodiment generally includes a cylindrical case 32 made of an insulator such as ceramics, a cylindrical coil 18 wound around the outside thereof, and a predetermined interval inside the cylindrical case 32. And a plurality of heating plates 20 made of a non-magnetic metal plate (for example, a metal plate made of SUS304).
  • a high frequency current is supplied to the cylindrical coil 18 from a high frequency power source (not shown), a high frequency magnetic field is generated in the longitudinal direction of the cylindrical case 32 (up and down direction in FIG. 16).
  • Each of the plurality of heating plates 20 is provided with a plurality of slits 21 extending in the same direction as the direction of the magnetic flux B of the high frequency magnetic field formed by the cylindrical coil 18 (the longitudinal direction of the cylindrical case 32). At this time, a part of the magnetic flux B of the high frequency magnetic field from the cylindrical coil 18 induction-heats the heating plate 20 closest to the cylindrical coil 18, but a part thereof passes through the slit 21 provided on the heating plate 20. Then, it reaches the heating plate 20 on the inner side, and this is induction-heated.
  • the heating plate 20 is most preferably austenitic stainless steel SUS304 similar to the first heating plate 20 described in the first embodiment.
  • the heating plate 20 is a flat plate.
  • the heating plate 20 bent in a waveform may be provided with a slit 21.
  • the cylindrical case 32 is not limited to a cylindrical cross section, and may be a hollow body having a rectangular cross section.
  • Induction heating apparatuses 1 to 3 according to Embodiments 1 to 3 are configured by a combination of a flat coil 10 and a plurality of flat heating plates 20 and 30, so that fluid heating is thin and has a large heat transfer area. Induction heating apparatus can be obtained. Such an induction heating apparatus can be used as a heat source for various apparatuses.
  • a hand drying apparatus 200 incorporating the induction heating apparatus 1 according to Embodiment 1 will be described below.
  • a typical hand dryer using a sheath heater is described in, for example, Japanese Patent Application Laid-Open No. 10-75915, and the disclosure thereof is integrated here as a single unit for reference.
  • FIG. 17 is a side cross-sectional view showing the hand dryer 200 according to the fifth embodiment.
  • the hand dryer 200 generally includes a housing 202, a blower 204 that is a high-pressure air generator that generates high-pressure air, and a power supply device 250.
  • the housing 202 includes a manual insertion portion 206, an intake port 208 for taking in ambient air, jet ports (spout nozzles) 212a and 212b for jetting air heated by the induction heating device 1, and an intake port 208.
  • the jet outlets 210a and 210b are in fluid communication with each other and have a front side duct 203a provided on the front side of the hand insertion portion 206 and a back side duct 203b provided on the back side.
  • a front side induction heating device 1a and a back side induction heating device 1b similar to the induction heating device 1 of the first embodiment are disposed inside the front side duct 203a and the back side duct 203b, respectively.
  • the induction heating devices 1a and 1b are electrically connected to the power supply device 250 by electric wirings 210a and 210b, and a high frequency current is supplied from the power supply device 250 to the induction heating devices 1a and 1b.
  • the power supply device 250 has a control circuit (not shown) for controlling the blower 204 and the induction heating devices 1a and 1b.
  • the hand dryer 200 configured as described above, when the blower 204 is operated, air is sucked from the air inlet 208, and the front side induction heating device 1a and the back side induction heating device 1b heat the air, and then the heated high pressure and high speed
  • the air jet F is ejected from the front side nozzle 212a and the back side nozzle 212b.
  • the air jet (warm air) F ejected from the front side nozzle 212a and the back side nozzle 212b is placed in the hand.
  • the attached water droplets can be blown away to quickly dry the hands.
  • the hand insertion unit 206 of such a hand drying apparatus 200 has a width that allows both hands to be inserted in the vertical direction (depth direction) of the paper surface of FIG. 17 and has a depth that allows insertion to the wrist in the vertical direction.
  • the manual insertion part 206 has a space
  • the distance between the left and right directions of the hand insertion portion 206 is small. Therefore, in order to increase the distance between the hand insertion portions 206 of the hand dryer 200 in the left-right direction of FIG.
  • the front side duct 203a and the rear side duct 203b are provided inside. It is necessary to design the arranged induction heating devices 1a and 1b as thin as possible, and the induction heating device of the present invention is extremely suitable.
  • the thickness of the coil 10 is 2 mm
  • the space (flow path) between the coil 10 and the first heating plate 20 is 3 mm
  • the thickness of the first heating plate 20 is Since 1 mm
  • the space (flow path) between the first and second heating plates 30 is 3 mm
  • the thickness of the second heating plate is 2 mm
  • the thickness of the induction heating device 1 as a whole is 20 mm.
  • the depth of the duct 203 is 26 mm. If the space (flow path) through which the airflow passes is 2 mm, the depth of the duct 203 is 20 mm.
  • the front side induction heating device 1a and the back side induction heating device 1b may be individually controlled so that the temperatures of the air ejected from the front side nozzle 212a and the back side nozzle 212b are different from each other.
  • the user usually inserts the hand into the hand insertion portion 206 so that the palm faces the front side nozzle 212a, so the warm air blown from the front side nozzle 212a hits the palm and is blown from the back side nozzle 212b. Hot air hits the back of the hand.
  • a hand is washed, more water droplets adhere to the palm than the back of the hand.
  • the temperature of the air ejected from the front side nozzle 212a and the back side nozzle 212b is higher than the temperature of the air ejected from the back side nozzle 212b.
  • two independent power supply devices 250 that supply high-frequency current to the front side induction heating device 1a so that the power supplied to the front side induction heating device 1b is larger than the power supplied to the back side induction heating device 1b. May be provided and controlled individually.
  • the hand dryer 200 may be configured so that the user can adjust the temperature of the air ejected from the front nozzle 212a and the back nozzle 212b.
  • the two power supply devices 250 for the front side induction heating device 1a and the back side induction heating device 1b and controlling them individually increases the manufacturing cost of the hand drying device 200.
  • the number of turns of the former coil 10 is set to the latter.
  • the temperature of the air ejected from the front side nozzle 212a is ejected from the rear side nozzle 212b by reducing the number of turns of the former coil 10 than the latter.
  • the hand dryer 200 may be configured to be higher than the temperature of the air.
  • FIG. 18 is a block diagram showing a circuit configuration of a power supply apparatus 250 that supplies different electric power to the front side induction heating apparatus 1a and the back side induction heating apparatus 1b.
  • the power supply apparatus 250 includes a half bridge circuit 254 in which switching elements 252a and 252b such as IGBTs are connected in series.
  • a DC voltage is supplied from the DC power supply 256 to the half bridge circuit 254, and is switched by the switching elements 252 a and 252 b of the half bridge circuit 254, and a predetermined rectangular wave voltage is output to the output stage of the half bridge circuit 254.
  • the switching elements 252 a and 252 b of the half bridge circuit are driven by the half bridge driver 258, and the half bridge driver 258 is controlled by the control unit 260.
  • a capacitor 262 is connected between the DC power supply 256 and the half bridge circuit 254, and the current is smoothed as necessary and supplied to the half bridge circuit 254.
  • a front-side induction heating device 1a having a resonance capacitor C1 connected in series and a back-side induction heating device 1b having a resonance capacitor C2 connected in series are connected in parallel to the output terminal of the half bridge circuit 254. .
  • the inductances of the front side induction heating device 1a and the back side induction heating device 1b may be different, but will be described below assuming that they are the same.
  • the power supply device 250 shown in FIG. 18 includes two resonance circuits, that is, a front-side resonance circuit RC1 including a front-side induction heating device 1a and a resonance capacitor C1 connected in series, and a back-side induction heating device 1b and a resonance capacitor connected in series. And a back side resonance circuit RC2 by C2.
  • the capacitances of the resonance capacitors C1 and C2 are different from each other, and FIG.
  • FIG. 19 is a graph showing the frequency dependence of the impedances of the front-side resonance circuit RC1 and the back-side resonance circuit RC2.
  • the minimum value of each impedance is the resonance frequency of each resonance circuit.
  • the impedance of the front-side resonance circuit RC1 is similarly smaller than the impedance of the back-side resonance circuit RC2, but the difference between the two impedances Is smaller than when the frequency of the rectangular wave voltage is f1. That is, by adjusting the frequency of the rectangular wave voltage output from the half-bridge circuit 254 and controlling the duty ratio thereof, the power consumption of one induction heating device is kept constant while the other induction heating device is kept constant. Power consumption can be controlled.
  • the induction heating apparatus provided with a plurality of heating plates on both sides of the coil has been described.
  • the induction has a simpler configuration in which a single heating body is disposed on each side of the coil.
  • the heating device will be described below.
  • FIG. 20 is a perspective view showing the induction heating device 6 according to Embodiment 6 of the present invention
  • FIG. 21 is an exploded perspective view of the induction heating device 6 shown in FIG.
  • the induction heating device 6 according to the sixth embodiment includes the same coil 10 as that of the first embodiment and the heating plate 20 that is arranged at a predetermined interval with a spacer 40 interposed between the coil 10 and the heating plate.
  • a flow path P is formed between the
  • the heating plate 20 is preferably a magnetic metal such as SUS430 of ferritic stainless steel, but may be a nonmagnetic metal such as SUS304 of austenitic stainless steel.
  • the heating plate 20 is induction heated.
  • Heat is transferred from the heating plate 20 to the air (air is heated) by flowing a fluid such as air through the flow path P between the coil 10 and the heating plate 20.
  • a fluid such as air
  • the heat transfer area is doubled compared to the case where the flow path P is not provided between the coil 10 and the heating plate 20. Can be increased.
  • it is preferable that the heat generated in the coil 10 is also directly transferred to the air and the coil 10 is similarly exposed to the air flow (cooled by air). At this time, when the coil 10 is exposed to an air flow, the insulating coating of the coil 10 is easily damaged by dust in the air. Therefore, the coil 10 is preferably covered with an insulator such as resin, glass, or ceramic.
  • FIG. 22 is a side cross-sectional view showing a hand dryer 300 incorporating the induction heating device 6 of FIG.
  • a hand dryer 300 shown in FIG. 22 is substantially the same as the hand dryer 200 shown in FIG. 17 of the fifth embodiment.
  • FIG. 23 is an enlarged cross-sectional view showing a portion surrounded by a thick broken line A in FIG. 22, which is substantially the same as the induction heating device 6 in FIG. 20.
  • a predetermined interval is also provided between the heating plate 20 and the duct 303, and a flow path P is formed between the two, and a total of four flow paths P are formed. ing.
  • the induction heating device 6 induction-heats the two heating plates 20 with one coil 10, and both the front and back surfaces of the two heating plates 20 serve as heat transfer surfaces (a total of four surfaces). Configured to work. Therefore, since a larger number of heat transfer surfaces can be realized by using a limited number of coils 10 and heating plates 20, it is possible to manufacture a small induction heating device 6 with higher heat transfer efficiency and lower cost. .
  • FIG. 24 is a perspective view of a plurality of induction heating devices 6 shown in FIG. 20 arranged in parallel via spacers 41, and FIG. 25 is parallel to a horizontal plane (a plane perpendicular to the flow path P). It is sectional drawing when cut
  • the induction heating device shown in FIG. 20 configured as described above, the same operation and effect as the induction heating device 6 shown in FIG. 20 can be realized, and since it has a large number of heat transfer surfaces, it is more efficient. Heat can be transferred to the air and warm air can be obtained.
  • the plurality of induction heating devices 6 shown in FIG. 20 are arranged so as to be separated from each other by using the spacers 41.
  • the present invention is not limited to this, and the outside is provided with grooves provided at predetermined intervals.
  • Each of the plurality of induction heating devices 6 may be disposed on a frame (not shown) so as to be fitted in the groove portion and separated from each other.
  • FIG. 26 is an exploded perspective view showing the induction heating device 7 according to the seventh embodiment of the present invention
  • FIG. 27 is a partial exploded perspective view of the induction heating device 7 of FIG.
  • the coil 10 of the induction heating device 7 is substantially the same as that of the sixth embodiment
  • the heating plate 20 of the induction heating device 7 is not flat and is formed by being bent into a waveform. Between the coil 10 and the heating plate 20, a flow path P is formed between the mountains (between adjacent peaks) without providing a spacer.
  • FIG. 28 is a cross-sectional view when the induction heating device 7 shown in FIGS. 26 and 27 is cut along a plane parallel to a horizontal plane (a plane orthogonal to the flow path P). In the partial region L in the left half of FIG.
  • the ridges of the respective heating plates 20 are arranged so as to coincide (facing) with each other.
  • the plurality of heating plates 20 may be arranged at arbitrary positions as long as the direction of the flow path P is constant.
  • the winding direction of each of the plurality of coils 10 is preferably the same. This is because leakage magnetic flux generated due to a space serving as the flow path P between the coil 10 and the heating plate 20 weakens each other's magnetic flux. For example, if the winding direction of one of the plurality of coils 10 is opposite to the other, the temperature rise of the coil 10 itself is greater when the same power is input than when the same direction is used. That is, Joule heat from the coil 10 increased. Also in the present embodiment, air is passed through the flow path P between the coil 10 and the heating plate 20, and the heat from the coil 10 is also transferred to the air, but the surface of the coil 10 is covered with an insulator. Therefore, in order to more efficiently transfer heat to the air, it is preferable to increase the ratio of induction heating from the heating plate 20 to Joule heat from the coil 10 with respect to input power.
  • the heat transfer area can be increased as compared with the flat plate, and the heat transfer efficiency to the air can be improved.
  • FIG. 29 is a similar cross-sectional view showing a modification of the induction heating device 7 shown in FIG.
  • a single heating plate 20 is disposed between adjacent coils 10
  • two heating plates 20 and a partition plate 26 are provided.
  • the partition plate 26 is sandwiched between two corrugated heating plates 20 and maintains a distance therebetween, and is preferably made of a metal plate, but is made of an insulating material such as glass, ceramics, or resin. Also good. Even if the partition plate 26 is a metal plate, the heat generated by induction heating is small, but rather, heat is easily transferred from the corrugated heating plate 20 that has been induction heated.
  • the partition plate 26 constitutes a part of the flow path P, it functions as a heat transfer surface to the air. Therefore, the induction heating apparatus shown in FIG. 29 can be induction-heated (increase the heat transfer surface more) with a smaller number of coils 20 than the apparatus shown in FIG. In addition, an induction heating device with high transmission efficiency can be realized.
  • the coil 10 is described as being housed in the insulating case 12 made of an insulating material such as resin or ceramics.
  • the coil 10 according to the present embodiment is housed in the coil case 14 made of a metal material. Since it has the same configuration as that of the above-described embodiment except for the point, it can be replaced with an arbitrary coil used in the induction heating device of the above-described embodiment. That is, the coil of the eighth embodiment can be applied not only to the sixth and seventh embodiments but also to all the coils according to the first to seventh embodiments.
  • FIGS. 30 is an exploded perspective view showing the coil 10 according to the eighth embodiment
  • FIG. 31 is a cross-sectional view of the coil shown in FIG. 30 taken along a plane parallel to the horizontal plane.
  • the coil 10 according to the eighth embodiment is formed by winding a conductive wire such as an enamel wire in a spiral shape, and is sandwiched between coil cases 14a and 14b made of a pair of metal materials (FIG. 30) and fixed integrally (FIG. 31).
  • the coil cases 14a and 14b are preferably made of a non-magnetic metal such as aluminum and have a plurality of slits 21 extending radially from the vicinity of the center of the coil 10 as shown in FIG.
  • the magnetic flux generated in the coil 10 passes through the coil cases 14a and 14b, and the heating plate disposed away from the coil 10 can be induction-heated.
  • the coil cases 14a and 14b are similarly induction-heated by the magnetic flux from the coil 10, but the heat generated in the coil cases 14a and 14b is suppressed by increasing the number of slits 21 or increasing the width thereof. be able to.
  • the coil cases 14a and 14b according to this embodiment are effectively used as a heat transfer surface for heating the fluid.
  • an insulating sheet (not shown) made of an insulating material such as resin may be disposed between the coil 10 and the coil cases 14a and 14b.
  • the slit 21 may be the same as the existence of a slit for the magnetic flux.
  • the coil 10 by disposing the coil 10 in the metal coil cases 14a and 14b, the substantial entire surface of the coil 10 is protected from dust contained in the fluid.
  • the coil 10 can be prevented from being deteriorated due to wear due to dust, and the coil 10 having a longer life and higher reliability can be realized.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Induction Heating (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)

Abstract

Un appareil de chauffage par induction présente un enroulement, un ou plusieurs premiers panneaux de chauffage constitués de conducteurs non magnétiques, chacun d'eux formant un canal entre l'enroulement et lui-même, des deuxièmes panneaux de chauffage constitués de conducteurs magnétiques, chacun d'eux formant un canal entre chaque premier panneau de chauffage et lui-même et une alimentation à haute fréquence destinée à fournir un courant à haute fréquence à l'enroulement. Les premiers panneaux de chauffage présentent des fentes qui s'étendent sensiblement dans la même direction que celle des flux magnétiques qui se développent au niveau de l'enroulement. Ainsi, une zone de transmission de chaleur est accrue grâce à une structure simple de manière à réaliser l'appareil de chauffage par induction capable de chauffer de manière efficace un fluide tel qu'un gaz et un liquide.
PCT/JP2008/057743 2008-04-22 2008-04-22 Appareil de chauffage par induction, générateur d'air chaud et appareil de séchage des mains Ceased WO2009130761A1 (fr)

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JP2010508991A JP5106628B2 (ja) 2008-04-22 2008-04-22 誘導加熱装置、これを用いた温風発生装置および手乾燥装置

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JP2012079646A (ja) * 2010-10-06 2012-04-19 Mitsubishi Electric Corp 誘導加熱装置および被加熱体
JP2012079647A (ja) * 2010-10-06 2012-04-19 Mitsubishi Electric Corp 誘導加熱装置および被加熱体
CN102650447A (zh) * 2012-05-22 2012-08-29 滨州市五海工贸有限公司 一种电磁感应室内墙体加热系统
EP2549191A1 (fr) * 2011-07-19 2013-01-23 Paul Baltes Radiateur en pierre naturelle
JP2014026976A (ja) * 2012-07-24 2014-02-06 Behr Gmbh & Co Kg 加熱装置
EP2816870A1 (fr) * 2013-06-19 2014-12-24 Behr GmbH & Co. KG Dispositif de chauffage
EP2816871A1 (fr) * 2013-06-19 2014-12-24 Behr GmbH & Co. KG Échangeur thermique et dispositif de chauffage
CN113116175A (zh) * 2019-12-31 2021-07-16 广东美的生活电器制造有限公司 加热装置及其控制方法、控制装置和计算机可读存储介质

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JP2006228438A (ja) * 2005-02-15 2006-08-31 Miura Co Ltd 電磁誘導加熱装置

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JP2012079646A (ja) * 2010-10-06 2012-04-19 Mitsubishi Electric Corp 誘導加熱装置および被加熱体
JP2012079647A (ja) * 2010-10-06 2012-04-19 Mitsubishi Electric Corp 誘導加熱装置および被加熱体
EP2549191A1 (fr) * 2011-07-19 2013-01-23 Paul Baltes Radiateur en pierre naturelle
CN102650447A (zh) * 2012-05-22 2012-08-29 滨州市五海工贸有限公司 一种电磁感应室内墙体加热系统
JP2014026976A (ja) * 2012-07-24 2014-02-06 Behr Gmbh & Co Kg 加熱装置
US9848464B2 (en) 2012-07-24 2017-12-19 Mahle International Gmbh Heating device
EP2816870A1 (fr) * 2013-06-19 2014-12-24 Behr GmbH & Co. KG Dispositif de chauffage
EP2816871A1 (fr) * 2013-06-19 2014-12-24 Behr GmbH & Co. KG Échangeur thermique et dispositif de chauffage
US9655171B2 (en) 2013-06-19 2017-05-16 Mahle International Gmbh Heater
US9743464B2 (en) 2013-06-19 2017-08-22 Mahle International Gmbh Heat exchanger device and heater
CN113116175A (zh) * 2019-12-31 2021-07-16 广东美的生活电器制造有限公司 加热装置及其控制方法、控制装置和计算机可读存储介质
CN113116175B (zh) * 2019-12-31 2022-09-13 广东美的生活电器制造有限公司 加热装置及其控制方法、控制装置和计算机可读存储介质

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