EP3528594A1 - Erhitzer mit elektromagnetischer induktion für fluide - Google Patents

Erhitzer mit elektromagnetischer induktion für fluide Download PDF

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Publication number
EP3528594A1
EP3528594A1 EP19156774.2A EP19156774A EP3528594A1 EP 3528594 A1 EP3528594 A1 EP 3528594A1 EP 19156774 A EP19156774 A EP 19156774A EP 3528594 A1 EP3528594 A1 EP 3528594A1
Authority
EP
European Patent Office
Prior art keywords
electromagnetic induction
heater
heating element
balls
fluid
Prior art date
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Granted
Application number
EP19156774.2A
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English (en)
French (fr)
Other versions
EP3528594B1 (de
Inventor
Maurilio Meschia
Gennaro CARRESE
Gregorio MILELLA
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Publication of EP3528594A1 publication Critical patent/EP3528594A1/de
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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
    • H05B6/105—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 electromagnetic induction electric heater for fluids.
  • Electric heaters for electromagnetic induction fluids are a category of electric heaters for fluids that use the heat produced by Joule effect by parasitic currents induced in a conductive material by an electromagnetic field generated by one or more coils in which a variable current flows.
  • variable magnetic field is induced by the oscillating currents that travel the coils; the currents are produced by generators not shown in the accompanying figures, and whose description is not relevant for the purposes of the invention.
  • the electromagnetic induction heaters the heat is not produced in the conductor that generates the electromagnetic field but in a material in direct contact with the fluid to be heated.
  • US 6118111 overcomes some limitations of the previous solution.
  • the tube bundle is replaced by an assembly consisting of two concentric tubes of non-conductive material which delimit an annular chamber inside which a cylindrical corrugated element of a conductive material is housed, the function of which is to realize the single turn coil of the secondary circuit where heat is generated.
  • the limitation of this solution is linked to the small exchange surface between the fluid and the heating element, consisting solely of the inner and outer surface of the corrugated cylindrical element. To increase the exchange surface it is necessary to increase the diameter of the heating element and consequently also the dimensions of the magnetic circuit in which the assembly is contained.
  • WO 89/12204 discloses a solution that improves the ratio between the size of the heating unit and the heat exchange surface.
  • the coil of the secondary circuit, with the function of heating element consists of a spiral crossed by the fluid from the external turn towards the internal part (or vice versa), therefore in this solution the exchange surface is increased with the same volume occupied.
  • the exchange surface is increased with the same volume occupied.
  • EP0873045A1 describes a heater consisting of a tube of non-conductive material surrounded by a cylindrical coil adapted to generate a field within the heater's tube.
  • the heating element consists of a matrix of interconnected plates in such a way as to form an element capable of being crossed by parasitic electric currents and at the same time to realize a structure capable of having a high exchange surface per unit of volume and to generate a mixing and a turbulent motion of the fluid passing through it.
  • the object of the invention is to eliminate the drawbacks and problems of the different solutions of the prior art illustrated above.
  • an object of the invention is to provide an electromagnetic induction heater which allows to obtain high specific powers without geometric limitations.
  • Another object of the invention is to provide such a heater for electromagnetic induction fluids in which there is a high heat exchange surface per unit of volume.
  • Another object of the invention is to provide such a heater for electromagnetic induction fluids in which there is high mixing without stagnation points, which can also be used with high viscosity fluids without adopting complex heater geometries.
  • Another object of the invention is to provide such a heater for electromagnetic induction fluids in which the greatest modularity and scalability is obtained.
  • Another and not the last object of the invention is to provide such a heater for electromagnetic induction fluids which is simple to make, therefore economical, and at the same time extremely reliable.
  • the heater for electromagnetic induction fluids comprises:
  • an electromagnetic induction heater according to the invention is shown in section, generally indicated by the reference number (100).
  • the heater (100) substantially consists of a coil 1 crossed by an alternating electric current for generating an electromagnetic field, a hollow cylindrical container 2 made of an electrically non-conductive and non-magnetic material, compatible with the fluid to be heated, and a heating element 3 consisting of a set of balls 4 of conductive material coated with an electrically insulating layer compatible with the fluid to be heated. Said spheres fill the cavity of the container according to an ordered or random packing.
  • the container 2 is arranged inside the coil 1 and is closed at its ends by two flanged flanges 5, of perforated cylindrical shape, provided with hydraulic connections for the fluid inlet and outlet respectively.
  • variable electromagnetic field produced by the induction coil 1 generates in the spheres 4 parasitic currents which due to Joule effect determine the heating of the spheres 4.
  • the fluid to be heated passes through the ball bed of the heating element 3 heating by conduction and convection.
  • the spheres 4 are electrically isolated from each other, the resulting parasitic currents cannot circulate in a continuous electric circuit on the periphery of the heating element 3, therefore the skin effect typical of the electromagnetic induction processes can occur only within the single sphere 4. In this way the shielding effect on the central part of the heating element 3 produced by the currents which, due to the skin effect, circulate on the surface of a continuous matrix heating element is avoided, and consequently a greater uniformity of the power density is obtained. in the whole body of the heating element 3.
  • Figure 2 shows the ball bed heating element 3 which ensures excellent mixing of the fluid even in the case of very viscous fluids without stagnation points.
  • the size of the balls 4 can be optimized according to the specific flow rate and the viscosity of the fluid that passes through the heating element 3 and the dimensions of the container 2.
  • balls of increasing diameter are used as viscosity and/or flow rate increase(s).
  • the ball bed heating element 3 comprises a simple constructive solution that can be scaled over a wide range of powers that does not require the construction of complex geometry elements.
  • Figure 3 shows in cross section one of the spheres which constitute the heating element 3.
  • the electrically insulating outer layer 4 ' covers the internal part in conductive material 4' '.
  • the conductive material 4 " of the core of the spheres 4 may have diamagnetic, paramagnetic or ferromagnetic characteristics.
  • the 4 " core of the balls 4 can be full or hollow.
  • the electrically insulating coating of the balls 4 can consist of thermoplastic or thermosetting resin in the case of heaters with operating temperatures up to 200 ° C; for higher temperatures the coating may be of the ceramic type.
  • the choice of electrically insulating coating must be made according to the maximum operating temperature and to the chemical compatibility with the fluid to be heated.
  • Figure 4 shows in section an alternative constructive solution of the heater (100) in which the internal configuration of the flanges 5 is funnel-shaped to prevent the formation of stagnation of the fluid that travels the electromagnetic induction heater from top to bottom with reference to the figure.
  • This solution is particularly suitable for high viscosity fluids, pastes and creams.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
EP19156774.2A 2018-02-16 2019-02-12 Erhitzer mit elektromagnetischer induktion für fluide Active EP3528594B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000002736A IT201800002736A1 (it) 2018-02-16 2018-02-16 Riscaldatore elettrico ad induzione elettromagnetica per fluidi

Publications (2)

Publication Number Publication Date
EP3528594A1 true EP3528594A1 (de) 2019-08-21
EP3528594B1 EP3528594B1 (de) 2019-12-11

Family

ID=62143496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19156774.2A Active EP3528594B1 (de) 2018-02-16 2019-02-12 Erhitzer mit elektromagnetischer induktion für fluide

Country Status (2)

Country Link
EP (1) EP3528594B1 (de)
IT (1) IT201800002736A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112569018A (zh) * 2020-12-31 2021-03-30 刘劼 一种小鼠大脑中动脉线栓装置
KR20220058990A (ko) * 2020-11-02 2022-05-10 주식회사 아이에스케이 자기 유도 볼 모듈 및 이에 의한 가열 장치
EP4241573A1 (de) * 2022-03-11 2023-09-13 Sidel Participations Konditionierungsvorrichtung für eine verpackungsanlage und verpackungsanlage zur verpackung eines giessbaren produkts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4341936A (en) * 1979-12-17 1982-07-27 Virgin George C Electromagnetic induction energy converter
US20050095168A1 (en) * 2002-06-12 2005-05-05 Steris Inc. Method for vaporizing a fluid using an electromagnetically responsive heating apparatus
WO2012061476A1 (en) * 2010-11-04 2012-05-10 3M Innovative Properties Company Method of forming filter elements
WO2012150530A2 (en) * 2011-04-30 2012-11-08 Kassel Harry Dean An electrical induction heating assembly
FR2994475A1 (fr) * 2012-08-13 2014-02-14 Winslim Sarl Dispositif de chauffage par induction d'un chauffe-eau et chauffe-eau muni d'un tel dispositif

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4341936A (en) * 1979-12-17 1982-07-27 Virgin George C Electromagnetic induction energy converter
US20050095168A1 (en) * 2002-06-12 2005-05-05 Steris Inc. Method for vaporizing a fluid using an electromagnetically responsive heating apparatus
WO2012061476A1 (en) * 2010-11-04 2012-05-10 3M Innovative Properties Company Method of forming filter elements
WO2012150530A2 (en) * 2011-04-30 2012-11-08 Kassel Harry Dean An electrical induction heating assembly
FR2994475A1 (fr) * 2012-08-13 2014-02-14 Winslim Sarl Dispositif de chauffage par induction d'un chauffe-eau et chauffe-eau muni d'un tel dispositif

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220058990A (ko) * 2020-11-02 2022-05-10 주식회사 아이에스케이 자기 유도 볼 모듈 및 이에 의한 가열 장치
CN112569018A (zh) * 2020-12-31 2021-03-30 刘劼 一种小鼠大脑中动脉线栓装置
EP4241573A1 (de) * 2022-03-11 2023-09-13 Sidel Participations Konditionierungsvorrichtung für eine verpackungsanlage und verpackungsanlage zur verpackung eines giessbaren produkts
WO2023169753A1 (en) * 2022-03-11 2023-09-14 Sidel Participations Conditioning device for a packaging plant and packaging plant for the packaging of a pourable product

Also Published As

Publication number Publication date
IT201800002736A1 (it) 2019-08-16
EP3528594B1 (de) 2019-12-11

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