EP0451066A1 - Dampferzeuger für Gargeräte mit Entwässerungseinrichtung - Google Patents

Dampferzeuger für Gargeräte mit Entwässerungseinrichtung Download PDF

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Publication number
EP0451066A1
EP0451066A1 EP91420111A EP91420111A EP0451066A1 EP 0451066 A1 EP0451066 A1 EP 0451066A1 EP 91420111 A EP91420111 A EP 91420111A EP 91420111 A EP91420111 A EP 91420111A EP 0451066 A1 EP0451066 A1 EP 0451066A1
Authority
EP
European Patent Office
Prior art keywords
pipe
enclosure
water
steam
steam generator
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
EP91420111A
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English (en)
French (fr)
Other versions
EP0451066B1 (de
Inventor
Raymond Violi
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.)
Societe Cooperative de Production Bourgeois SCOP
Original Assignee
Societe Cooperative de Production Bourgeois SCOP
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 Societe Cooperative de Production Bourgeois SCOP filed Critical Societe Cooperative de Production Bourgeois SCOP
Publication of EP0451066A1 publication Critical patent/EP0451066A1/de
Application granted granted Critical
Publication of EP0451066B1 publication Critical patent/EP0451066B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water

Definitions

  • the present invention relates to devices for producing water vapor from liquid water, the water vapor can be used in particular in food cooking appliances.
  • Numerous steam generators are already known, which generally include a generator enclosure suitable for containing water, means for bringing water into the enclosure, a steam conduction pipe for bringing the steam in a use enclosure, and means for heating the water contained in the generator enclosure to bring the water to a boil and produce steam.
  • document EP-A-0 323 939 describes such a steam generator comprising a lower horizontal pipe, an upper horizontal pipe, the two lower and upper horizontal pipes being connected by one or more parallel vertical heating tubes and by a return tube also vertical, a bypass of the return tube being provided with water level detection means.
  • a lower lateral orifice, closable by a valve, allows the water contained in the generator to drain to empty the generator at the end of use.
  • the problem proposed by the present invention is to eliminate, in a simple, automatic and inexpensive manner, the excessive differential heating appearing on the heating elements of the steam generators after a period of operation.
  • the solution must allow sufficient removal of the scale appearing at the bottom of the steam generator.
  • a first solution is suggested in document EP-A-317 444, which describes a steam generator in which the heating means are of a particular nature, using porous bodies.
  • the porous heating body is immersed in an enclosure containing water and bounded by a lower wall provided with an evacuation orifice in a lower evacuation pipe closed by a valve.
  • the document suggests removing the scale particles by opening the lower valve for the flow of water, and simultaneously supplying rinsing water through an upper pipe.
  • Such a cleaning process requires an additional volume of rinsing water, and means for supplying and controlling the flow of rinsing water, which significantly increases the cost of the installation.
  • such a structure with water supply in the upper part of the enclosure, will be difficult to apply to a steam generator in which the heating means are vertical tubes, since it would then be necessary to introduce the rinsing water into each tubes separately.
  • This structure is also complex and expensive, since it requires not only an additional flow of rinse water, but also means for supplying rinse water, controlling the flow of rinse water, and a pump. 'evacuation.
  • this solution would not be suitable for cleaning steam generators in which the heating means are vertical tubes: the means described do not allow a fluid current to be produced inside the tubes, since the current product is perpendicular to the axis of the heating tubes.
  • the pump is advantageously a rotary vane pump, rotating around an axis parallel to the second end of the intermediate pipe, and delivering into an outlet pipe orifice disposed radially on the periphery of the rotation area of the vanes.
  • the rotary vanes are driven by an asynchronous electric motor.
  • Such a type of pump is well suited for use in the present invention, because it has a very high robustness and is not sensitive to the risks of blockage. Scale particles cannot block the pump and degrade it.
  • the outlet pipe is ascending from the pump to an upper bend, and then descending to the drain pipe.
  • a water passage is permanently left from the enclosure of the steam generator to the drain pipe, the pump not preventing the passage of water but simply ensuring its drive when it is rotating.
  • the device avoids the appearance of overpressures inside the steam generator, any overpressure causing the flow of water in the direction of the drain pipe.
  • the device is also very reliable, since nothing can prevent the evacuation of the water contained in the enclosure of the steam generator.
  • This solution also has an economic advantage, because it is of a particularly low cost, not requiring the use of solenoid valves.
  • the evacuation structure according to the invention can be applied to types of steam generator in which the heating means are immersion resistors inserted simply in the enclosure containing the water.
  • the invention is particularly advantageous when it is applied to a steam generator in which the heating means are vertical heating tubes connecting a transverse lower pipe and a transverse upper pipe, with a return pipe also vertical.
  • the heating tubes being provided with an electrical resistance wound in a helix and in contact with the external face of their wall.
  • a steam generator according to the present invention comprises a generator enclosure 1 suitable for containing water.
  • a steam conduction pipe 4 makes it possible to recover the steam in the upper part of the enclosure 1 in order to bring it into a use enclosure schematically represented 5, for example the enclosure of an oven for food cooking.
  • the enclosure 1 comprises an upper horizontal pipe 6, a lower horizontal pipe 7, both connected by at least one vertical heating tube, for example three tubes 8, 9 and 10 respectively, and by a tube vertical return 11.
  • the heating tubes 8, 9 and 10 are hollow tubes, for example metallic, carrying helical electrical resistors such as the resistor 12 of the tube 8 in contact with the outer face of each tube.
  • the heating tubes are connected to the upper and lower pipes by flexible connectors such as the connector 120 which has only been shown in FIG. 3.
  • the return tube 11 is provided with a parallel bypass 13 which comprises means for measuring the water level A.
  • the measuring means comprise a resistive probe 14, the lower end of which is at an intermediate level A desired water, and which provides an electrical signal of presence or absence of water at level A.
  • the electrical signal is sent to an electrical treatment device, not shown in the figures, making it possible to control valve 3 to admit water until reaching level A in which the water comes into contact with the probe 14, and cut off the water supply as long as the probe 14 indicates contact of the water on the probe.
  • resistor 12 Electrical resistors such as resistor 12 are designed to heat the walls of tubes 8, 9 and 10 and bring the water they contain to a boil. The water vapor escapes from the top and enters the upper horizontal pipe 6, then escapes through the steam conduction pipe 4 into the use enclosure 5. The complete operation of this type of generator is described in document EP-A-0 323 939.
  • the lower wall 15 of the lower horizontal pipe 7 is generally flat and horizontal and has an orifice 16, formed in its central part as shown in FIG. 3.
  • the orifice 16 is connected to the first end of an intermediate pipe 17 whose second end 18 is connected to the inlet of a pump 19.
  • the intermediate pipe 17 is horizontal or descending from its first end adjacent to the lower pipe 7 to its second end 18 adjacent to the pump 19.
  • the pump 19 is located at a level lower than the level of the lower pipe 7 of the generator.
  • the pump 19 is a suction and discharge pump, the outlet 20 of which discharges into an outlet pipe 21 extended by a drain pipe 22.
  • the pump 19 is a rotary vane pump, for example as shown diagrammatically in FIG. 4 in perspective and in partial section.
  • the intermediate pipe 17 opens into a pump enclosure 23 through an axial orifice 24.
  • the pump comprises rotary vanes such as the pallet 25, rotatably mounted on a drive shaft 26 coaxial with the orifice 24 and the adjacent part of the pipe intermediate 17.
  • the outlet orifice 27 of the pump is disposed radially in the upper part of the enclosure wall 23, as shown in FIG. 4.
  • the rotation of the vanes 25 causes the water to flow back into the outlet pipe 21 .
  • the outlet pipe 21 comprises an ascending part from the outlet 20 of the pump 19 to an upper bend 28, and a downward part from the upper bend 28 to the drain pipe 22.
  • the steam generator is of the type of fluent steam generator at atmospheric pressure.
  • the water level regulation means maintain inside the enclosure 1 a level close to the level A and substantially constant. It is then advantageous to provide a level B of the upper bend 28 of the outlet pipe 21 which is higher than the level A of the water in the enclosure, but lower than the level C of the steam conductive pipe 4.
  • the maximum level of water then exceeds level A, but should not exceed level B of the upper bend 28 of outlet pipe 21. As a result, the water is not likely to flow through the conduction pipe of steam 4 in the oven use enclosure 5.
  • a solenoid valve 30 is interposed in the intermediate pipe 17, and is associated with control means for controlling its closing during the production of steam in the steam generator, and for command its opening during the emptying phase.
  • Others parts of the device are identical to those of the embodiment of FIG. 1.
  • the level B of the upper elbow 28 can be chosen to be greater, equal or less than the level A of normal regulation of the water in the enclosure 1 It is however preferable to keep an upper bend 28, which avoids the return of liquid which may come from the drain pipe 22.
  • This embodiment comprising a solenoid valve 30 may also be suitable in the case where the steam generator must produce steam under pressure higher than atmospheric pressure.
  • the device of the present invention is such that the water level is kept substantially constant and at the intermediate height A in the enclosure 1.
  • the electrical resistors such as the resistor 12 are supplied by an external source d electric power, and they heat the tubes 8, 9 and 10 and the water they contain. This water vaporizes and the steam escapes through the upper pipe 6 and the steam conduction pipe 4 into the enclosure 5 for using steam.
  • the evaporation of the water lowers the water level in the enclosure 1, and when the level becomes lower than the level A, the probe 14 emits an electrical signal causing the opening of the solenoid valve 3 and the introduction of water in the lower horizontal pipe 7.
  • the probe 14 produces another electrical signal causing the closing of the solenoid valve 3.
  • the device is thus kept in operation as long as one wishes produce steam.
  • the solenoid valve 3 After normal operation, for example at the end of each day, the user orders the start of a draining step, during which the electrical resistors 12 are no longer supplied, the solenoid valve 3 remains closed, and the pump 19 is supplied with electrical energy to cause rotation of the rotary vanes 25.
  • the solenoid valve 30 In the embodiments comprising a solenoid valve 30 in the intermediate pipe 17, the solenoid valve 30 must then be open to allow the passage of water in the pipe 17.
  • the pump 19 causes the rapid vortex suction of the water contained in the enclosure 1 and its ejection in the drain pipe 22. After total ejection, the rotation of the pump 19 is stopped, it is closed if necessary the solenoid valve 30, and the device is ready to admit water again and produce steam.
  • the overpressure causes the water to flow back through the intermediate pipe 17, via outlet pipe 21 and drain pipe 22, thus limiting the overpressure in enclosure 5 and in enclosure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Cookers (AREA)
  • Commercial Cooking Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Electric Ovens (AREA)
EP91420111A 1990-04-04 1991-04-02 Dampferzeuger für Gargeräte mit Entwässerungseinrichtung Expired - Lifetime EP0451066B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004608A FR2660733A1 (fr) 1990-04-04 1990-04-04 Generateur de vapeur d'eau pour appareil de cuisson, muni d'un dispositif de vidange.
FR9004608 1990-04-04

Publications (2)

Publication Number Publication Date
EP0451066A1 true EP0451066A1 (de) 1991-10-09
EP0451066B1 EP0451066B1 (de) 1995-10-11

Family

ID=9395629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420111A Expired - Lifetime EP0451066B1 (de) 1990-04-04 1991-04-02 Dampferzeuger für Gargeräte mit Entwässerungseinrichtung

Country Status (5)

Country Link
US (1) US5223696A (de)
EP (1) EP0451066B1 (de)
AT (1) ATE129065T1 (de)
DE (1) DE69113671T2 (de)
FR (1) FR2660733A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511525A1 (de) * 1991-04-10 1992-11-04 C.AR.EL.( COSTRUZIONE ARMADI ELETTRICI) S.r.l. Vorrichtung zur Erzeugung von Wasserdampf, insbesondere zur Luftbefeuchtung
WO2012045242A1 (zh) * 2010-10-08 2012-04-12 晶辉科技（深圳）有限公司 蒸汽发生装置及其控制方法、家用电蒸箱

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754334B1 (fr) * 1996-10-07 1998-12-18 Bourgeois Prod Coop Four a vapeur et convexion forcee
US6122729A (en) * 1997-05-13 2000-09-19 Advanced Micro Devices, Inc. Prefetch buffer which stores a pointer indicating an initial predecode position
US5968574A (en) * 1999-02-24 1999-10-19 Sann; Melbourne H. Convection food steamer and associated method
US8117961B2 (en) * 2003-09-02 2012-02-21 Penguin Rapid Thawers Llc Apparatus for thawing frozen food items
US20050045047A1 (en) * 2003-09-02 2005-03-03 Sann Melbourne H. Apparatus and methods for thawing frozen items
US8744252B1 (en) * 2008-03-12 2014-06-03 John Snyder Tankless hot water generator
KR102032174B1 (ko) * 2017-01-26 2019-10-15 엘지전자 주식회사 스팀발생장치 및 이를 포함하는 조리기기

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0280782A1 (de) * 1987-02-03 1988-09-07 E. Schönmann & Co. AG Dampferzeugungseinrichtung
EP0317444A1 (de) * 1987-11-19 1989-05-24 Association Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels (Armines) Dampferzeuger
DE8901904U1 (de) * 1989-02-17 1989-07-20 Lechmetall Landsberg Gmbh, 8910 Landsberg, De

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1389166A (en) * 1920-09-25 1921-08-30 Oliver P Scott Water-heater
US1495658A (en) * 1922-08-31 1924-05-27 Rufus L Wilkinson Heater
US1672942A (en) * 1925-12-18 1928-06-12 Isaacs Mark Electric water heater
US1667758A (en) * 1926-06-28 1928-05-01 Bigelow Company Electric boiler apparatus
US2154021A (en) * 1937-08-31 1939-04-11 Nicholas E Abbate Electric heater
US2519920A (en) * 1947-07-10 1950-08-22 Donald B Miner Electric resistance water heater
US3025381A (en) * 1959-02-09 1962-03-13 Walter E Pickering Steam generator
NL158376B (nl) * 1974-01-18 1978-11-15 Innovative Process Equipment Snelkookinrichting.
US4287407A (en) * 1978-08-17 1981-09-01 Hobart Corporation Tank flushing delay arrangement for a steam generator
US4230536A (en) * 1979-02-05 1980-10-28 Sech Charles E Method for the distillation purification of organic heat transfer fluids
GB2058335B (en) * 1979-05-18 1983-09-01 Atomic Energy Authority Uk Soldering apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0280782A1 (de) * 1987-02-03 1988-09-07 E. Schönmann & Co. AG Dampferzeugungseinrichtung
EP0317444A1 (de) * 1987-11-19 1989-05-24 Association Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels (Armines) Dampferzeuger
DE8901904U1 (de) * 1989-02-17 1989-07-20 Lechmetall Landsberg Gmbh, 8910 Landsberg, De
EP0383327B1 (de) * 1989-02-17 1993-06-09 LechMetall Landsberg GmbH Edelstahlerzeugnisse Dampferzeuger für Gargeräte mit Entkalkungseinrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511525A1 (de) * 1991-04-10 1992-11-04 C.AR.EL.( COSTRUZIONE ARMADI ELETTRICI) S.r.l. Vorrichtung zur Erzeugung von Wasserdampf, insbesondere zur Luftbefeuchtung
WO2012045242A1 (zh) * 2010-10-08 2012-04-12 晶辉科技（深圳）有限公司 蒸汽发生装置及其控制方法、家用电蒸箱

Also Published As

Publication number Publication date
DE69113671D1 (de) 1995-11-16
EP0451066B1 (de) 1995-10-11
ATE129065T1 (de) 1995-10-15
FR2660733B1 (de) 1995-04-07
DE69113671T2 (de) 1996-06-20
FR2660733A1 (fr) 1991-10-11
US5223696A (en) 1993-06-29

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