WO2015155758A1 - Module de chauffage par induction et four à convection associé - Google Patents

Module de chauffage par induction et four à convection associé Download PDF

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Publication number
WO2015155758A1
WO2015155758A1 PCT/IL2015/050304 IL2015050304W WO2015155758A1 WO 2015155758 A1 WO2015155758 A1 WO 2015155758A1 IL 2015050304 W IL2015050304 W IL 2015050304W WO 2015155758 A1 WO2015155758 A1 WO 2015155758A1
Authority
WO
WIPO (PCT)
Prior art keywords
space
oven
induction heating
enclosed
outer housing
Prior art date
Application number
PCT/IL2015/050304
Other languages
English (en)
Inventor
Tomer KUJMAN
Original Assignee
Kujman Tomer
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kujman Tomer filed Critical Kujman Tomer
Publication of WO2015155758A1 publication Critical patent/WO2015155758A1/fr

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Classifications

    • 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
    • H05B6/12—Cooking devices
    • H05B6/129—Cooking devices induction ovens
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B1/00—Bakers' ovens
    • A21B1/02—Bakers' ovens characterised by the heating arrangements
    • A21B1/24—Ovens heated by media flowing therethrough
    • A21B1/26—Ovens heated by media flowing therethrough by hot air
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B1/00—Bakers' ovens
    • A21B1/42—Bakers' ovens characterised by the baking surfaces moving during the baking
    • A21B1/44—Bakers' ovens characterised by the baking surfaces moving during the baking with surfaces rotating in a horizontal plane

Definitions

  • the present: invention relates to the field of convection ovens (or any other cooking appliance that uses the convection principle, such as Combi Steamer and etc.) heated by IH (Induction Heating) means. More particularly, the present invention relates to a baking oven, in particular a baking cabinet that has a baking chamber in which the goods to be baked can be placed, one or more heating units based on IH method, an air ventilation fan which draws air from the baking chamber and one or more outlets for dispensing the heated air into the baking chamber.
  • IH Induction Heating
  • Convection ovens are the norm in most commercial bakeries and commercial kitchens. Convection ovens may be heated with electricity, gas or oil. The difference between convection ovens and traditional (radial or thermal) ovens is that the convection oven heating mechanism is based on a heating unit and an air circulation mechanism.
  • Convection based baking oven in particular a baking cabinet, usually comprising a baking chamber into which the goods to be baked can be introduced, a unit for heating a heating medium, having an inlet for receiving the heating medium from the baking chamber and an outlet for dispensing the heated heating medium into the baking chamber, and comprising a first flow channel for conveying the heating medium between the baking chamber and the inlet and a second flow channel for conveying the heating medium between the outlet and the baking chamber. Therefore, as a result, this forms a closed heating circuit in which the heating medium, such as air, circtilates.
  • Convection oven circulates hot air through heating unit.
  • Most electrical heating devices are made of several resistive heating devices with a smooth surface-heating structure.
  • a more advanced approach uses finned heating elements to enlarge the heat radiation. Both methods characterized by high power consumption.
  • IH Induction Heating
  • the basic electromagnetic phenomenon that induction-heating process relays on is quite simple.
  • By generating an alternating current in an induction coil a time-variable magnetic field will be produced.
  • the magnetic field will have the same frequenc3' as the coil current.
  • the strength of the magnetic field in a specific point is depending on the current flowing in the induction coil, the number of turns, the coil geometry, and the distance from the coil.
  • the time-variable magnetic field will induce eddy currents in the workpiece located near the coil.
  • Alternating eddy currents produces heat in the workpiece according to Joule effect ( ⁇ ⁇ 2 R) since eddy currents are a direct result of the magnetic flex flowing throw the workpiece the currents in the coil windings needs to be high (or the number of turns) for a fast heating process.
  • Reference depth depends on the frequency and material properties as described in Equation (1):
  • IH is not new in the industrial market it has not yet fully spread in the as a heat treatment method due to large initial costs. Nevertheless, due to high power abilities along with extremely low power consumption IH devices are slowly emerging at high power applications were power consumption expense is much larger than the initial costs.
  • the present invention relates to an inductively heated convection oven, comprising: a) an outer housing having a plurality of different sides joined together to form an enclosed space with at least one of the sides forming a door to provide access to the enclosed space;
  • an inner housing having a plurality of different sides joined together to form an enclosed oven space-spaced from and supported within the sides of the outer housing and having at least one side thereof facing the door of the outer housing providing access to the interior of the enclosed oven space;
  • At least one ventilation fan adapted for circulating air around the enclosed oven space, wherein the flow path of the circulated air is defined by the space between the inner and outer housing;
  • At least one induction heating unit supported within the space intermediate respective confronting sides of the inner and outer housings and arranged in a plane that is essentially parallel to a respective side of a magnetically susceptible element to maximize the inductive coupling to said element;
  • control means for electrically exciting the induction heating unit at a relatively high frequency of the order of kilohertz to thereby magnetically induce the generation of induction heating at the flow path of the circulated air.
  • the magnetically susceptible element is a heat sink.
  • the magnetically susceptible element is the ventilation fan.
  • the induction heating unit includes a planar magnetic core and multilayer Printed Circuit Board (PCB) coil.
  • the magnetic core is an open E-core.
  • the induction heating unit includes helically-wound shaped inductive heating coils.
  • the inductive heating coil can be a conductor, in particular a conductor made of litz wire or any other type of conductor such as hollow water cooled, etc.
  • the present invention relates to an induction heating module for a convection oven, comprising: an induction heating unit coupled to a magnetically susceptible element in a way that maximize the inductive coupling to said magnetically susceptible element, and which magnetically induce the generation of induction heating at the flow path of circulated air.
  • FIGs. 1A and IB schematically illustrate an induction heating unit and a corresponding heat sink that combined together into a heating module adapted for dissipating heat into a surrounding medium, according to some embodiment of the invention
  • Fig. 2 schematically illustrates a baking oven which has, one baking cabinet, an outlet for air circulation and the heating module of Fig. IB, wherein the heating module includes Induction Heating units (based on PCB with E -cores) and a heated Heat Sink, according to an embodiment of the present invention;
  • the heating module includes Induction Heating units (based on PCB with E -cores) and a heated Heat Sink, according to an embodiment of the present invention
  • Fig. 3 schematically illustrates a more focused view of the two IH (based on E-core) along with a heated air ventilation fan and the heated Heat Sink;
  • Fig. 4A schematically illustrates an IH module based on a Litz wire, according to another embodiment of the invention.
  • Fig. 4B schematically illustrates a focused view of two IH (based on Litz wire of Fig. 4A) along with the heated air ventilation fan and the heated Heat Sink, according to another embodiment of the present invention
  • Fig. 5 schematically illustrates a baking oven which has, one baking cabinet, outlets for dual air circulations and the heating module of Fig. IB, according to another embodiment of the present invention
  • conventional oven is used to indicate an oven, in particular a baking cabinet which has a baking chamber in which the goods to be baked can be placed, an IH based heating unit, an air ventilation fan which draws air from the baking chamber and one or more outlets for dispensing the heated air into the baking chamber.
  • This term does not imply any particular shape, construction material or geometry, and invention is applicable to all suitable ovens.
  • Fig. 1A shows a heating module that can be used in conjunction with the invention.
  • the heating module illustrated in this figure is particularly convenient because it can be applied as an ad-on device to existing convection ovens without the need to carry out major alterations in the structure.
  • the heating module generally indicated by numeral 1 in the figure comprises a heat sink 2 and an Induction Heating (IH) unit (i.e., IH coil) that includes a planar magnetic core 3, multilayer Printed Circuit Board (PCB) coil 4, and an optional dielectric insulator ⁇ .
  • IH coil based on PCB with an open E-core that can be used by the present invention is disclosed in Israeli patent application number 230752 dated January 30, 2014.
  • IB schematically illustrates a heating module 1 that includes a plurality of planar magnetic cores 3, according to an embodiment of the invention.
  • each planar magnetic core 3 is implemented by an open E-shaped magnetic core that is made of ferromagnetic compounds such as ferrites.
  • Fig. 2 is an overall front view of a novel inductively heated rotating Rack convection baking oven constructed in accordance with the heating module of the invention and also illustrates certain parts of the inductively heated bake oven (while omitting others) in order to better depict the overall construction and relationship of these elements in a completed, inductively heated bake oven assembly according to the invention.
  • the inductively heated bake oven is comprised by an outer housing 10 which can be fabricated from stainless steel or any other kind of alloy, usually made of at least two stainless steel AISI 304 layers along with heat barrier made of compressed panels and flocks of rock wool.
  • An inner housing as shown at 15 is mechanically supported within the outer housing 10 by suitable thermal insulating and mechanically strong structural supports (not shown).
  • the inner and outer housings each have a plurality of different sides joined together to form an enclosed oven space with one of the sides of the outer housing forming a door to provide access to the baking chamber.
  • Rotating rack oven may use a gear mechanism 101 to rotate an inner structure 100 in order to maintain a safe rotation of a baking wagon 16. That side of the inner housing 15 which confronts the door also is open to provide access to the interior of the enclosed oven space provided by inner housing 15.
  • the access door may have a double glass front in order to allow the interior of the oven space to be viewed and includes a handle to facilitate opening and closing of the door.
  • a first Induction heating (IH) unit 12 induces eddy currents in a corresponding heat sink 11 located in the outlet of the IH unit 12, which dispends the first stage heated air through the plates of heat sink 11.
  • Heat sink 11 is a passive heat exchanger that dissipates heat into the surrounding medium.
  • the heat sink 11 is located within the oven in such a way that the surrounding medium covers the flow path of the circulated air as received from a ventilation fan 14 (that is rotations are controlled by a motor 20).
  • the baking chamber 16 in which the goods to be baked can be placed is shown together with the air circulation path as indicated by the set of chained arrows. The circulation path of the air is indicated with respect to the direction of the arrows.
  • the convention i.e., the circulation path of the air
  • the ventilation fan 14 draws air from the baking chamber 16 (relatively cooled air) and passes it through the heat sink 11 that heats the air for dispensing the heated air into the baking chamber 16.
  • the novel oven comprises a second IH 13 unit.
  • the second IH 13 unit induces eddy currents in the ventilation fan 14.
  • the second IH unit 13 is located adjacent to the ventilation fan 14, which turns the blades of fan 14 into an induction heat dissipating device.
  • the blades of the ventilation fan 14 should be made of a ferromagnetic metal such as cast iron or stainless steel. It is clear that an oven designer can consider using both heating dissipations methods as suggested by IH 12 and 13 and each one individually.
  • Fig. 3 schematically illustrates a more focused view of the two IH units 12 and 13 (that are based on E-core and PCB, as generally described with respect to Fig. 1) along with the heated air ventilation fan 14 and the heated heat sink 11.
  • Fig. 4A schematically illustrates an IH module based on a Litz wire 17 and the heat sink 11, according to another embodiment of the invention.
  • Fig. 4B shows still another alternative construction for the induction heating coils for use in fabricating the novel heated bake oven of the present invention.
  • This figure schematically illustrates a focused view of two IH units 17 and 18 (that are based on Litz wire) along with the heated air ventilation fan 14 and the heated heat sink 11, according to another embodiment of the present invention.
  • a plurality of planar, helically-wound shaped inductive heating coils shown at IH units 17 and 18 are physically supported (by means not shown in Fig. 4) within the space intermediate the respective confronting sides of the inner and outer housings 10 and 15, and are arranged to maximize the inductive coupling between the coils 17 and 18 to the respective associated heat sink 11 and fan 14, respectively.
  • the heat sink 11 and the air ventilation fan 14 are fabricated from sheet members made of ferromagnetic metals capable of being inductively heated through the action of relatively high frequency magnetic induction fields of the order of kilohertz which magnetically induces the generation of heat.
  • Fig. 5 schematically illustrates a baking oven which has, a baking cabinet 16 with outlets adapted for air circulations, according to another embodiment of the present invention.
  • the ventilation fan 14 is heated by two IH units 12.
  • the ventilation fan 14 located in such a way that at least two flow paths of air circulation are generated from both sides of the fan's blades, wherein the cooled air is returned in both paths from the bottom of the ventilation fan 14.
  • the electronic circuit it is composed of suitable controls and indications for controlling the operation of the oven.
  • an AC to AC converter can be used in order to generate a high frequency AC signals within the IH coils.
  • the frequency and the amplitude of the AC signals will determine the power that will flow to the workpiece (in this case to the heat sink 11 or to the ventilation fan 14) and generate the wanted heat.
  • Various controls for controlling the electronic circuitry are needed such as air flow measurements, several heat measurements, moisture measurement in case a steam generator is in use and etc. None of the above has been shown in order not to unduly complicate the Figures.
  • the main advantage provided by the invention is that the suggested oven configuration decreases significantly the power consumption upon a conventional baking oven of the type defined hereinabove.
  • IH devices is proved to be more efficient than traditional resistive heating devices. Furthermore by heating the ventilation fan above surrounding temperature will heat the emitted air. Driving the produced hot air through a heated heat sink located in the outlet will enlarge the heat generated by the ventilation fan even more. Unlike resistive heating which usually vises a number of parallel heating elements and therefore cannot change the amount of power in a continuous manner. IH power flow is determined by the frequency (and amplitude) of the current flowing throw the IH coil, and therefor can be easily changed in a continuous manner. More over this feature will decrease the power loses even more since a steady temperature control can be applied (this energy saving feature is relatively similar to the energy saving feature of inverter based air conditioners). All of the above will significantly reduce the amount of electrical power used to operate the above type of oven.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • General Induction Heating (AREA)

Abstract

La présente invention concerne un four à convection chauffé par induction comprenant: a) un boîtier externe comprenant une pluralité de différents côtés raccordés les uns aux autres pour former un espace clos, au moins l'un des côtés formant une porte pour fournir un accès à l'espace clos; b) un boîtier interne comprenant une pluralité de différents côtés raccordés les uns aux autres pour former un espace de four clos - espacé des côtés du boîtier externe et soutenu à l'intérieur de ces derniers, et dont au moins un côté fait face à la porte du boîtier externe, fournissant ainsi un accès à l'intérieur de l'espace de four clos; c) au moins un ventilateur conçu pour faire circuler l'air autour de l'espace de four clos, le trajet d'écoulement de l'air en circulation étant défini par l'espace entre le boîtier interne et externe; d) au moins une unité de chauffage par induction soutenue à l'intérieur de l'espace intermédiaire de côtés opposés respectifs des boîtiers interne et externe et agencée dans un plan qui est sensiblement parallèle à un côté respectif d'un élément magnétiquement sensible pour développer au maximum le couplage inductif audit élément; et e) des moyens de commande permettant d'exciter électriquement l'unité de chauffage par induction à une fréquence relativement élevée de l'ordre du kilohertz, ce qui permet d'induire magnétiquement la génération de chauffage par induction au niveau du trajet d'écoulement de l'air en circulation.
PCT/IL2015/050304 2014-04-10 2015-03-24 Module de chauffage par induction et four à convection associé WO2015155758A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL232081A IL232081A0 (en) 2014-04-10 2014-04-10 An induction heating module and a convection oven from it
IL232081 2014-04-10

Publications (1)

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WO2015155758A1 true WO2015155758A1 (fr) 2015-10-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2673743A1 (es) * 2016-12-23 2018-06-25 Bsh Electrodomésticos España, S.A. Dispositivo de aparato de cocción por inducción con una unidad de ventilador y aparato de cocción con dicho dispositivo
CN112235975A (zh) * 2020-10-03 2021-01-15 胡梦 一种5g通讯基站通风散热结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632944A (en) * 1970-02-19 1972-01-04 Leon R Lease Hysteresis heating unit
US3790735A (en) * 1971-10-06 1974-02-05 Environment One Corp Inductive heated bake oven
US5847370A (en) * 1990-06-04 1998-12-08 Nordson Corporation Can coating and curing system having focused induction heater using thin lamination cores

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632944A (en) * 1970-02-19 1972-01-04 Leon R Lease Hysteresis heating unit
US3790735A (en) * 1971-10-06 1974-02-05 Environment One Corp Inductive heated bake oven
US5847370A (en) * 1990-06-04 1998-12-08 Nordson Corporation Can coating and curing system having focused induction heater using thin lamination cores

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2673743A1 (es) * 2016-12-23 2018-06-25 Bsh Electrodomésticos España, S.A. Dispositivo de aparato de cocción por inducción con una unidad de ventilador y aparato de cocción con dicho dispositivo
WO2018116059A1 (fr) * 2016-12-23 2018-06-28 BSH Hausgeräte GmbH Dispositif pour appareil de cuisson
US11530875B2 (en) 2016-12-23 2022-12-20 BSH Hausgeräte GmbH Cooking appliance
CN112235975A (zh) * 2020-10-03 2021-01-15 胡梦 一种5g通讯基站通风散热结构

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Publication number Publication date
IL232081A0 (en) 2014-08-31

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