GB2377483A - Steam generator for a cooking device - Google Patents

Steam generator for a cooking device Download PDF

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Publication number
GB2377483A
GB2377483A GB0204512A GB0204512A GB2377483A GB 2377483 A GB2377483 A GB 2377483A GB 0204512 A GB0204512 A GB 0204512A GB 0204512 A GB0204512 A GB 0204512A GB 2377483 A GB2377483 A GB 2377483A
Authority
GB
United Kingdom
Prior art keywords
boiler
water
steam generator
inner chamber
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.)
Granted
Application number
GB0204512A
Other versions
GB2377483B (en
GB0204512D0 (en
Inventor
Peter Kohlstrung
Peter Wiedemann
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.)
Rational AG
Original Assignee
Rational AG
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 Rational AG filed Critical Rational AG
Publication of GB0204512D0 publication Critical patent/GB0204512D0/en
Publication of GB2377483A publication Critical patent/GB2377483A/en
Application granted granted Critical
Publication of GB2377483B publication Critical patent/GB2377483B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A21BAKING; EDIBLE DOUGHS
    • A21BBAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B3/00Parts or accessories of ovens
    • A21B3/04Air-treatment devices for ovens, e.g. regulating humidity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/10Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
    • B24B49/105Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means using eddy currents
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/28Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/281Methods of steam generation characterised by form of heating method in boilers heated electrically other than by electrical resistances or electrodes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/28Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/284Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B5/00Steam boilers of drum type, i.e. without internal furnace or fire tubes, the boiler body being contacted externally by flue gas
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/04Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
    • A47J2027/043Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels for cooking food in steam

Landscapes

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

Abstract

The generator 1 has a boiler chamber 2 with a frusto-conical wall 3 that diverges toward a base 15. A heating device, such as an electrical coil 7, is used to heat the water 4 externally from the chamber. The heating may alternatively be provided by hot combustion gases or by induction. A water inlet 5 supplies water to the bottom of the chamber which also forms a pump sump. The evaporated water, together with entrained water, exits via a steam outlet 8. The entrained water may be removed by a water separator 9 before it is returned to the boiler chamber via a pump 11 and pipe 12. The internal surface of the boiler chamber wall 3 may have a glass, ceramic, or metal surface. A soil-resistant pump 17 may be provided to allow removal of boiler scale 13 and 14.

Description

The invention relates to a steam generator, particularly for a cooking
device, comprising a boiler inner chamber to receive water, said boiler inner chamber being defined by boiler walls and a boiler base, a water inlet to the boiler inner chamber, a water outlet from the boiler inner chamber, a heating device for evaporating water from the boiler inner chamber and a steam outlet for the evaporated water.
Numerous steam generators of this kind are known from the prior art wherein the water is heated and
evaporated by heating elements inside the boiler housing. For example, DE 199 12 444 discloses a steam generator for a cooking device such as a table or upright unit operating with hot air and/or hot steam. The known steam generator comprises a boiler inner chamber for water for evaporation and contains heating elements inter alla. Changes in the boiler inner chamber filling volume due to limescale deposits are monitored to show when descaling is necessary and/or for descaling to be carried out automatically as soon as necessary.
The disadvantage of the generic steam generator is that it occupies a large volume within the cooking device. If this volume is reduced by reducing the boiler inner chamber base area then, given a constant quantity of steam generated, this results in the disadvantage that the speed of the steam
through the surface of the water increases and thus water droplets are increasingly entrained together with the ascending steam. Also, a base area reduction of this kind results in accelerated scale formation since the heating elements must be closer together to-ensure adequate heat transfer to the water. The object of the present invention, therefore, is so to develop the generic steam generator as to overcome the disadvantages of the prior art,
particularly by reducing the volume of the steam generator and hence the space required in the cooking device without water increasingly reaching the cooking chamber, while in addition the rate and extent of limescale formation are reduced and easy removal of lime residues in the form of boiler scale on the boiler walls is rendered possible.
According to the invention, to this end, the boiler walls are treatable from outside, the boiler walls are constructed to diverge from one another towards the boiler base and the boiler base forras a pump sump.
According to one feature of the invention the boiler walls may be of conical or frusto-pyramidal construction. According to another proposal of the invention the boiler walls facing the boiler inner chamber have a
c i -3 smooth surface, preferably comprising glass' ceramic or metal.
According to another feature of the invention the boiler walls may be treatable by way of hot combustion gases, inductively or electrically.
According to another proposal of the invention the boiler walls are electrically treatable by way of heating resistances, the latter preferably comprising heating filaments wound around the boiler walls or printed circuits applied by th ck-film technology. Preferably, according to the invention, a water separator is disposed between the steam outlet and a return to the boiler inner chamber.
According to another feature of the invention the water separator may comprise a cyclone, a baffle plate or a swirl nozzle.
According to another feature of the invention a first pump may be disposed between the water separator and the boiler inner chamber. This is necessary is the geodetic height difference between the water separator and the entry point of the return to the boiler inner chamber is such that separated water cannot flow into the boiler inner chamber by gravity.
According to the invention, a second soiling-
resistant pump is disposed between the boiler base and the outlet.
According to another proposal of the invention the second pump comprises a comminuting device, more particularly for boiler scale.
Further features and advantages of the invention will be apparent from the following description in
which one exemplified embodiment of the invention is explained in detail with reference to a diagrammatic drawing. The drawing, which comprises a single Figure, is a longitudinal section of a steam generator according to the invention.
As shown in the drawing, a steam generator 1 according to the invention comprises a boiler inner chamber 2 having a frusto-conical boiler wall to receive water 4 which can be supplied via a water inlet 5 up to a water level 6. The water 4 is treatable and ultimately evaporatable by means of heating elements 7 which are wound around the boiler wall 3. The steam thus generated, together with entrained water, leaves the boiler inner chamber 3 through a steam outlet 8, the entrained water being separated in a water separator 9, for example in the form of a cyclone, before the steam can reach a cooking chamber (not shown) via a connection 10.
The water separated in the water separator 9 is returned to the boiler inner chamber 2 by means of a pump 11 and via a return 12..
Since water, as already stated is partially entrained with generated steam it at least temporarily adheres to the boiler walls 3 and evaporates from there, and this may lead to the formation of boiler scale 13. The boiler walls 3 are preferably made from ceramic in order to have a very smooth surface, to effect a continuous detachment of boiler scale 13 due to mechanical stresses caused by different thermal expansion between the boiler walls 3 and the boiler scale 13.
Also, because of the frusto-conical shape of the Doiler walls 3 the boiler scale 13 can unobstructedly drop by gravity into the water 4.
The boiler scale 14 thus removed collects on the boiler base 15, which is preferably constructed in the form of a pump sump.
When a relatively large quantity of boiler scale 14 has accumulated on the boiler base 15, the water 4 together with the boiler scale 14 can be disposed of via an outlet 16 and via a soiling-resistant draining pump 17, which comminutes the accumulating boiler scale 14 and thus forms a slurry, and then to an outlet lD for disposal.
Thus a steam generator is provided in simple manner according to the invention and occupies a small volume in a cooking device, guarantees reduced lime scaling and prevents water from directly entering the cooking chamber.
"I
The features of the invention as disclosed in the foregoing description, in the drawing, and in the
claims may be significant both individually and in any desired combination to embody the invention in its various forms.
List of references 1. Steam generator 2. Boiler inner chamber 3. Boiler wall 4. Water 5. Water inlet 6. Water level 7. Heating filament 8. Steam outlet 9. Water separator 10. Connection to cooking chamber 1 1. Pump 12. Return 13. Boiler scale 14. Detached boiler scale 15. Boiler base 16. Outlet 17. Soil resistant draining pump 16. Outlet

Claims (10)

- Claims
1. steam generator (1), particularly for a cooking device, comprising a boiler inner chamber (2) to receive water (4), said boiler inner chamber being defined by boiler walls (at and a boiler base (15), a water inlet (5) to the boiler inner chamber (2), a water outlet (16 18) from the boiler inner chamber (2}, a heating device (7) for evaporating water (4) from the boiler inner chamber (2) and a steam outlet (8) for the evaporated water (4), characterized in that the boiler walls (3) are treatable from outside, the boiler walls (3) are constructed to diverge from one another towards the boiler base (15) and the boiler base (15) forms a pump sump.
2. A steam generator according to claim 1, characterized in that the boiler walls 13) are of conical or frusto-pyramidal construction.
3 A steam generator according to claim 1 or 2, characterized in that the boiler walls (3) facing the boiler inner chamber (2) have a smooth surface, preferably comprising glass, ceramic or metal.
4. A steam generator according to any one of the preceding claims, characterized in that the boiler walls (3) are treatable by way of hot combustion gases, inductively or electrically.
5. A steam generator according to claim 4, characterized in that the boiler walls (3) are electrically treatable by way of heating resistances, the latter preferably comprising heating filaments (7) wound around the boiler walls (3) or printed circuits applied by thick-film technology.
6. A steam generator according to any one of the preceding claims, characterized by a water separator (9) disposed between the steam outlet (8) and a return (12) to the boiler inner chamber (21.
7. A Steen generator according to claim 6, characterized in that the water separator (9) comprises a cyclone, a baffle plate or a swirl nozzle.
8. A steam generator according to claim 6 or 7, charactertsed by a first pump (11) between the water separator (9) and the boiler inner chamber (2) .
9. A steam generator according to any one of the preceding claims, characterized by a second soiling-
resistant pump (17) between the boiler base and the outlet (18).
10. A steam generator according to claim 9, characterized in that the second pump (17) comprises a comminuting device, more particularly for boiler scale (13, 14).
GB0204512A 2001-02-26 2002-02-26 Steam generator particulary for a cooking device Expired - Fee Related GB2377483B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10109251A DE10109251C1 (en) 2001-02-26 2001-02-26 Steam generator, in particular for a cooking appliance

Publications (3)

Publication Number Publication Date
GB0204512D0 GB0204512D0 (en) 2002-04-10
GB2377483A true GB2377483A (en) 2003-01-15
GB2377483B GB2377483B (en) 2004-05-05

Family

ID=7675560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0204512A Expired - Fee Related GB2377483B (en) 2001-02-26 2002-02-26 Steam generator particulary for a cooking device

Country Status (4)

Country Link
DE (1) DE10109251C1 (en)
FR (1) FR2821658B1 (en)
GB (1) GB2377483B (en)
IT (1) ITMI20020377A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012093328A3 (en) * 2011-01-03 2013-07-25 Koninklijke Philips Electronics N.V. An apparatus for generating steam
EP2705779A1 (en) * 2012-09-10 2014-03-12 Electrolux Home Products Corporation N.V. A steam system for a steam cooking appliance
EP3553392A1 (en) * 2018-04-12 2019-10-16 LG Electronics Inc. Cooking appliance
EP3701797A1 (en) * 2019-02-26 2020-09-02 Electrolux Professional S.p.A. Oven comprising a steam generator

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10109251C1 (en) * 2001-02-26 2002-08-08 Rational Ag Steam generator, in particular for a cooking appliance
DE102007024007B4 (en) 2007-05-22 2016-11-10 Rational Ag Steam generator for a food processor and steamer
DE102007029244A1 (en) * 2007-06-14 2008-12-24 E.G.O. Elektro-Gerätebau GmbH Steam generator, cooking device, method for operating or for producing a steam generator and method for cooling a heating device
DE102007048567B4 (en) 2007-10-09 2011-11-24 Miele & Cie. Kg Process for cleaning a system consisting of a tank and a water heater, and system
DE102010061029A1 (en) * 2010-12-06 2012-06-06 Miele & Cie. Kg Cooking appliance
PL2881660T3 (en) 2013-12-09 2020-05-18 Gorenje D.D. Centrifugal separator of fluid and vapour with a household apparatus
US9788679B2 (en) * 2015-06-29 2017-10-17 Whirlpool Corporation Steam generation system for use in cooking appliance
DE102015215768A1 (en) * 2015-08-19 2017-02-23 BSH Hausgeräte GmbH Household steamer
PL229142B1 (en) * 2015-09-03 2018-06-29 Janow Gwidon Pure steam generator
ITUA20162801A1 (en) * 2016-04-21 2017-10-21 De Longhi Appliances Srl BOILER
CN105864738A (en) * 2016-05-06 2016-08-17 广东长盈电器有限公司 Limescale-free vapor generator
DE102017117054B4 (en) 2017-07-27 2020-12-10 Hartwig Sammann Steam cleaning device and method for cleaning machines or machine parts
DE102017216599A1 (en) * 2017-09-19 2019-03-21 E.G.O. Elektro-Gerätebau GmbH Steam generator for a Dampfgargerät, Dampfgargerät with such a steam generator and method for steam generation
DE102019103783A1 (en) * 2019-02-14 2020-08-20 Rational Aktiengesellschaft Steam generator for a cooking appliance, cooking appliance and method for generating steam
DE102019215339A1 (en) 2019-10-07 2021-04-08 BSH Hausgeräte GmbH Evaporator system for a household appliance and household appliance

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2113985A (en) * 1982-02-01 1983-08-17 Beatrice Foods Co Pressureless steam cooker
EP0193863A2 (en) * 1985-03-08 1986-09-10 E.G.O. Italiana S.p.A. Steam generator, particularly for a cooking utensil
GB2330064A (en) * 1997-10-07 1999-04-14 Otter Controls Ltd Mounting arrangements for elements of electrically heated vessels
DE10109251C1 (en) * 2001-02-26 2002-08-08 Rational Ag Steam generator, in particular for a cooking appliance

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BE457941A (en) *
BE430532A (en) *
DE3223193A1 (en) * 1982-06-22 1983-12-22 Indimant Industriediamanten GmbH, 2072 Bargteheide Device for cleaning surfaces by means of steam
DE3512370A1 (en) * 1985-04-04 1986-10-16 Veit GmbH & Co, 8910 Landsberg Steam generator
IT1228118B (en) * 1988-12-21 1991-05-28 Merloni Elettrodomestici Spa STEAM GENERATOR FOR HIGH SIMPLICITY MAINTENANCE COOKING OVENS
DE8901904U1 (en) * 1989-02-17 1989-07-20 Lechmetall Landsberg GmbH, 8910 Landsberg Steam generator for cooking appliances with decalcification device
DE19912444C2 (en) * 1999-03-19 2001-11-29 Rational Ag Steam generator of a cooking device with a device for electronic calcification monitoring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2113985A (en) * 1982-02-01 1983-08-17 Beatrice Foods Co Pressureless steam cooker
EP0193863A2 (en) * 1985-03-08 1986-09-10 E.G.O. Italiana S.p.A. Steam generator, particularly for a cooking utensil
GB2330064A (en) * 1997-10-07 1999-04-14 Otter Controls Ltd Mounting arrangements for elements of electrically heated vessels
DE10109251C1 (en) * 2001-02-26 2002-08-08 Rational Ag Steam generator, in particular for a cooking appliance

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012093328A3 (en) * 2011-01-03 2013-07-25 Koninklijke Philips Electronics N.V. An apparatus for generating steam
JP2014506170A (en) * 2011-01-03 2014-03-13 コーニンクレッカ フィリップス エヌ ヴェ Steam generator
US8881434B2 (en) 2011-01-03 2014-11-11 Koninklijke Philips N.V. Apparatus for generating steam
EP2705779A1 (en) * 2012-09-10 2014-03-12 Electrolux Home Products Corporation N.V. A steam system for a steam cooking appliance
WO2014037198A1 (en) * 2012-09-10 2014-03-13 Electrolux Home Products Corporation N. V. A steam system for a steam cooking appliance
AU2013311963B2 (en) * 2012-09-10 2016-11-24 Electrolux Home Products Corporation N. V. A steam system for a steam cooking appliance
US10830430B2 (en) 2012-09-10 2020-11-10 Electrolux Home Products, Corporation N.V. Steam system for a steam cooking appliance
EP3553392A1 (en) * 2018-04-12 2019-10-16 LG Electronics Inc. Cooking appliance
US10871291B2 (en) 2018-04-12 2020-12-22 Lg Electronics Inc. Cooking appliance
EP3701797A1 (en) * 2019-02-26 2020-09-02 Electrolux Professional S.p.A. Oven comprising a steam generator

Also Published As

Publication number Publication date
GB2377483B (en) 2004-05-05
FR2821658A1 (en) 2002-09-06
DE10109251C1 (en) 2002-08-08
GB0204512D0 (en) 2002-04-10
FR2821658B1 (en) 2003-10-03
ITMI20020377A1 (en) 2003-08-26
ITMI20020377A0 (en) 2002-02-26

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140226