EP0835057A1 - Generateur de vapeur - Google Patents

Generateur de vapeur

Info

Publication number
EP0835057A1
EP0835057A1 EP97908146A EP97908146A EP0835057A1 EP 0835057 A1 EP0835057 A1 EP 0835057A1 EP 97908146 A EP97908146 A EP 97908146A EP 97908146 A EP97908146 A EP 97908146A EP 0835057 A1 EP0835057 A1 EP 0835057A1
Authority
EP
European Patent Office
Prior art keywords
steam
inclined surface
heating element
track
generator according
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.)
Withdrawn
Application number
EP97908146A
Other languages
German (de)
English (en)
Inventor
Junker Elmar
Christian Eskildsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Publication of EP0835057A1 publication Critical patent/EP0835057A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B3/00—Parts or accessories of ovens
    • A21B3/04—Air-treatment devices for ovens, e.g. regulating humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/287—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in sprays or in films

Definitions

  • a generator for steam A generator for steam.
  • the invention relates to a generator for essentially dry steam using the evaporation of water falling on a heated surface.
  • Steam is used to transport heat by the very- efficient evaporation/condensation process from the heat source to the heat consumer, e.g. food being heated in an oven cavity. Drops carried with the steam injected will only contribute the heat corresponding to the temperature difference, weight, and heat capacity of water whereas condensed dry steam will contribute the heat of condensation e.g. 500 times as efficient, dependent of the conditions of flow. It is well-known to generate steam by boiling water in a closed container, and to carry it to its place of use by means of a conduit. It is also well-known to generate steam by letting drops fall on a surface which is kept at a temperature appreciably above the boiling temperature of water. Usually, splashes or droplets generated when the drop impinges on the surface are caught by splash guards in order that the generated steam does not carry water drops.
  • the invention is hence materialized in that the water falls on an inclined surface having guide means causing it to take a path along the inclined surface with a lenght sufficient to permit complete evaporation before the diminishing amount reaches the confines of the inclined surface. It is considered that the combination of running and sliding along the path causes fresh water-to-heater contact through the complete and very shortened evaporation cycle. This is a considerable improvement over known steam generators.
  • An advantageous embodiment of the invention is particular in that the inclined surface is a conical surface, and the path is defined by a downwardly spiralling track on said conical surface.
  • the steam outlet from the generator may be placed at the apex of the cone which is also the top, and thereby the splash guard is obtained automatically.
  • there is disposed in the track a wick-like structure of wire mesh or porous material, such as sintered metal. This further disrupts the creation of an insulating steam layer, and the water is pulled along by capillary forces to reach areas which have not yet been cooled by evaporation.
  • a further advantageous embodiment is particular in that the downwardly spiralling track is confined by ridges containing a heating element. In this manner it is obtained that the material constituting the cone is used as efficiently as possible, because there is a nearly constant thickness of cone material surrounding the heating element.
  • This embodiment is preferably manufactured by casting an alloy which is corrosion resistant and a good heat conductor around the heating element.
  • Another advantageous embodiment is particular in that a spiralling heating element is hard soldered or welded onto a conical metal cone, so that the track is defined between the cone and the heating element. In this manner, a still simpler manner of manufacture than the casting process may be used, e.g. an industrial welding robot.
  • Fig. 1 shows a section through an oven cavity with a steam generator according to one embodiment of the invention
  • Fig. 2 shows the steam generator in a vertical section.
  • FIG. 1 an oven cavity 1 which has a circular hole 2 in the top plate.
  • the hole is completely covered by a steam generating unit 3.
  • the steam generating unit 3 consists of a base 4 and a bowl shaped cover 5 which in the present embodiment is secured to the base by a sealing compound. These parts define a hollow space S between them.
  • the base 4 is shaped like a cone with a smooth inside surface 6 and a surface with a spiral-shaped ridge 7 on the outside. The ridge spirals down the conical surface and defines a channel or passage 8 between consecutive windings of the ridge which equally passes down the cone with continuously increasing radius.
  • a spiral-shaped heating element 9 of the type consisting of an outer tube 10 of heat-resistant steel, inside which is compressed a ceramic insulating material 11, and a central resistance wire 12, which may itself be coiled.
  • the shape of the spiral-shaped heating element corresponds closely to the ridge, and in practice the base 4 is cast in a corrosion resistant and heat conducting alloy, such as silumin with the heating element 10 being fitted in the mould.
  • the ends 13, 14 of the heating element pass through the cover 5 in order to be connected to an electrical power supply.
  • the base 4 is provided with a bore 15 at the apex of the cone so that there is communication between the hollow S and the inside of the oven cavity 1.
  • a pipe 16 is connected through the cover 5 and ends just above the top part of the channel 8.
  • a pump feeds water via the pipe 16 to the top of the channel, and it starts to flow down the slope of the channel around the conical surface.
  • the heating element 9 When sufficient electric power is supplied to the heating element 9, the whole base is hot, and the amount of water from the pipe 16 begins to evaporate, i.e. turn into steam, when it impinges on the top of the channel 8, and it continues to evaporate as it passes down the channel. Some sizzling and splashing will go on, but the steam will obtain a partial pressure which is greater than the atmospheric pressure and will pass through the bore 15.
  • the production rate may be controlled in various ways.
  • the power may be supplied so that the base 4 obtains a temperature which ensures that an amount from the pipe 16 has just completed evaporation as the last remains of it reaches the bottom of the channel, whereupon a new amount should be supplied for continuous production of steam.
  • the base temperature is dependent on the amount of water and the evaporation. This temperature may be measured by a sensor positioned in a bore 17 in the base.
  • the supply rate may be increased along with a suitable increase in power so that the whole amount is evaporated during the average travel time. Even if the supply of water should be too high with respect to the power, the excess water that will accumulate at the bottom of the cone inside the cover 5 will eventually boil off. It should be noted that what is produced through the present apparatus is essentially dry steam at atmospheric pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Commercial Cooking Devices (AREA)

Abstract

Ce générateur, essentiellement destiné à générer de la vapeur sèche, évapore l'eau alors que celle-ci s'écoule vers le bas sur une surface chauffée et inclinée, le long de moyens de guidage. La vapeur est recueillie à proximité du haut de la surface inclinée, et est déchargée dans une cavité par un orifice. Ceci permet d'éviter que les éclaboussures n'atteignent la cavité. Dans un mode de réalisation préféré, la surface inclinée est conique, et les moyens de guidage sont constitués par une paroi hélicoïdale continue ménagée sur ladite surface conique.
EP97908146A 1996-03-12 1997-03-12 Generateur de vapeur Withdrawn EP0835057A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK29196 1996-03-12
DK29196 1996-03-12
PCT/DK1997/000110 WO1997033479A1 (fr) 1996-03-12 1997-03-12 Generateur de vapeur

Publications (1)

Publication Number Publication Date
EP0835057A1 true EP0835057A1 (fr) 1998-04-15

Family

ID=8091899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97908146A Withdrawn EP0835057A1 (fr) 1996-03-12 1997-03-12 Generateur de vapeur

Country Status (3)

Country Link
EP (1) EP0835057A1 (fr)
AU (1) AU2022697A (fr)
WO (1) WO1997033479A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20011786A (fi) 2001-09-10 2003-03-11 Dieta Oy Leivinuunin kosteuden mittausmenetelmä ja laite
US7476369B2 (en) * 2003-09-16 2009-01-13 Scican Ltd. Apparatus for steam sterilization of articles
FI20050957L (sv) * 2005-09-26 2007-03-27 Adwatec Oy Arrangemang för att leda fuktig luft in i en värmebehandlingsugn, såsom t.ex. en ugn för bageriprodukter
FR3029270A1 (fr) * 2014-11-28 2016-06-03 Commissariat Energie Atomique Dispositif de conversion d'un liquide en vapeur
FR3050254B1 (fr) 2016-04-13 2018-03-30 Commissariat A L'energie Atomique Et Aux Energies Alternatives Dispositif de conversion d'un liquide en vapeur

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836118C2 (de) * 1978-08-17 1980-07-10 Debag, Deutsche Backofenbau Gmbh, 8000 Muenchen Backofen
GB8420232D0 (en) * 1984-08-09 1984-09-12 Mono Equipment Ltd Heat accumulator
US4700685A (en) * 1986-05-09 1987-10-20 Lincoln Foodservice Products, Inc. Combination convection and steamer oven
IT1253692B (it) * 1991-07-17 1995-08-22 Zanussi Grandi Impianti Spa Dispositivo di generazione del vapore per apparecchiature di cottura degli alimenti, come forni di cottura o simili.
ES2124337T3 (es) * 1993-08-05 1999-02-01 Grandi Angelo Cucine Spa Horno de conveccion y de vapor para productos comestibles.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9733479A1 *

Also Published As

Publication number Publication date
AU2022697A (en) 1997-10-01
WO1997033479A1 (fr) 1997-09-18

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19971212

AK Designated contracting states

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Designated state(s): AT BE CH DE DK ES FI FR GB IE IT LI LU MC NL SE

17Q First examination report despatched

Effective date: 19991208

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20001003