EP1019655B1 - Process for restoring the level of water in boilers of steam generating machines - Google Patents

Process for restoring the level of water in boilers of steam generating machines Download PDF

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Publication number
EP1019655B1
EP1019655B1 EP98948940A EP98948940A EP1019655B1 EP 1019655 B1 EP1019655 B1 EP 1019655B1 EP 98948940 A EP98948940 A EP 98948940A EP 98948940 A EP98948940 A EP 98948940A EP 1019655 B1 EP1019655 B1 EP 1019655B1
Authority
EP
European Patent Office
Prior art keywords
pump
boiler
water
level
starting
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.)
Expired - Lifetime
Application number
EP98948940A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1019655A1 (en
Inventor
Gianluigi Comelli
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.)
Vapor Service Srl
Original Assignee
Vapor Service Srl
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 Vapor Service Srl filed Critical Vapor Service Srl
Publication of EP1019655A1 publication Critical patent/EP1019655A1/en
Application granted granted Critical
Publication of EP1019655B1 publication Critical patent/EP1019655B1/en
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
    • F22B1/285—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs the water being fed by a pump to the reservoirs

Definitions

  • the present invention relates to a process for restoring the level of water in boilers of steam generating machines.
  • the invention applies to the steam generating machines to be associated with various appliances such as flatirons, cleaning devices, air humidifiers, etc., and is directed to obtain a controlled and precise filling of the boiler in order to ensure that the functioning of the steam generator is always in condition of best efficiency.
  • Steam generators are known incorporating a boiler constituted by an hermetically closed container tank, provided with heating resistors having the function of transforming the water into steam.
  • the known boilers normally have a level sensor which provides to disconnect the resistors as soon as the level of the water reaches a predetermined minimum level, as well as to signal to the user such condition so that he can provide for the manual filling of the boiler.
  • Document DE 37 20 583 A1 discloses a process for restoring the level of water in a boiler of a steam generating machine of the type comprising a boiler, an auxiliary water supply, a pump connecting the auxiliary water supply to the boiler, means for detecting a predetermined minimum level of water inside the boiler and a control device for controlling the operation of the pump. According to the cited prior art document, whenever the minimum level of water inside the boiler is detected, the pump is operated for a predetermined constant operating time.
  • Document US 4 948 947 A discloses a process for restoring the level of water in a boiler of a steam generating machine of the type comprising a boiler, an auxiliary water supply, a pump connecting the auxiliary water supply to the boiler, means for detecting a predetermined minimum level of water inside the boiler, means for detecting a predetermined maximum level of water inside the boiler and a control device for controlling the operation of the pump. Whenever the water level inside the boiler reaches the minimum level the pump is started and it is stopped when the water reaches the maximum level.
  • a process for restoring the level of water in a boiler of a steam generating machine of the type comprising a boiler, an auxiliary water tank, a pump connecting the auxiliary water tank to the boiler, means for detecting a predetermined minimum level of water inside the boiler and a control device for controlling the operation of the pump, the said process comprising the following steps:
  • reference numeral 10 indicates generically a detail of a steam generating machine using the process for restoring the level of water in the boiler 11, according to the process according to the invention.
  • Said machine 10 includes a water containing auxiliary tank 12 connected to a pump 13 connected to the boiler 11 through an inlet 14.
  • the water of the tank 12 is introduced, at command, through the pump 13 to fill the boiler 11, where it is progressively heated and then led to evaporation by the electric heating resistor 15 to generate steam which is supplied to the appliance (not shown) through the delivery outlet 16.
  • the pump 13 is automatically operated, by a starting and control device 17, any time the water in the boiler 11 reaches a predetermined minimum level L0 which is calculated in such a manner to maintain the electric resistor 15 always submerged.
  • the reaching of said minimum level L0 is detected by the same inlet conduit 14 which acts as conduction probe as the water level reaches its lower edge 18.
  • the operation of the pump 13 is operatively controlled by the pressure measuring device 19 which, by utilising the continuously detected value of the pressure inside the boiler 11, controls the pump 13, through said starting and control device, to cause the said pump to modify its operating time according to the value of said pressure.
  • the flow rate of the pump 13 is variable depending upon the variation of the pressure in the boiler 11 and changes continuously, during the refilling operations, according to the variation of the quantity of water contained in the boiler 11.
  • the detection of the flow rate of the pump 13 according to the pressure in the boiler 11 allows to ensure under any circumstance and at any time the control of the filling conditions, by modifying the time of operation of the pump 13 to ensure the exact reaching of the maximum level L1.
  • Such detection of the flow rate which is based on the characteristic pressure/flow rate curve of the specific pump 13 used, according to a first solution occurs in a substantially continuous way.
  • said detection occurs with a desired frequency, for instance every second, also depending upon the mechanical features of the pump 13.
  • an instantaneous flow rate reader 21 On the feeding duct connecting the pump 13 to the boiler 11 there is arranged an instantaneous flow rate reader 21.
  • Said reader 21 continuously detects the real instantaneous flow rate of the pump 13, as it changes according to the pressure within the boiler 11, and controls in feedback the starting and control device 17 in such a manner that it modifies the operating time of the pump 13 in order to obtain the desired and precise filling under any operating condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP98948940A 1997-09-30 1998-09-08 Process for restoring the level of water in boilers of steam generating machines Expired - Lifetime EP1019655B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT97UD000173A IT1295505B1 (it) 1997-09-30 1997-09-30 Procedimento di reintegro per caldaie in macchine per la generazione di vapore
ITUD970173U 1997-09-30
PCT/EP1998/005728 WO1999017056A1 (en) 1997-09-30 1998-09-08 Process for restoring the level of water in boilers of steam generating machines

Publications (2)

Publication Number Publication Date
EP1019655A1 EP1019655A1 (en) 2000-07-19
EP1019655B1 true EP1019655B1 (en) 2002-10-23

Family

ID=11422470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98948940A Expired - Lifetime EP1019655B1 (en) 1997-09-30 1998-09-08 Process for restoring the level of water in boilers of steam generating machines

Country Status (8)

Country Link
EP (1) EP1019655B1 (it)
AT (1) ATE226704T1 (it)
AU (1) AU9538498A (it)
DE (1) DE69808955T2 (it)
ES (1) ES2184325T3 (it)
HR (1) HRP20000246B1 (it)
IT (1) IT1295505B1 (it)
WO (1) WO1999017056A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4356793A1 (en) * 2022-10-03 2024-04-24 Whirlpool Corporation Liquid level estimation in a steam generation system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0202988D0 (sv) † 2002-03-15 2002-10-10 Delaval Holding Ab A method and an arrangement at a dairy farm
DE102009055144A1 (de) * 2009-12-22 2011-06-30 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Dampferzeugungseinheit für ein Haushaltsgerät und Verfahren zum Erzeugen von Wasserdampf
GB201017461D0 (en) 2010-10-15 2010-12-01 Strix Ltd Electric steam generation
DE102011006766B4 (de) * 2011-04-05 2014-12-04 BSH Bosch und Siemens Hausgeräte GmbH Dampferzeuger und Verfahren zum Steuern der Wasserzufuhr des Dampferzeugers
DE102012100070A1 (de) * 2012-01-05 2013-07-11 Alfred Kärcher Gmbh & Co. Kg Dampfreinigungsgerät
EP2929242B1 (en) 2012-12-05 2018-10-24 Kim, No Eul Electrode boiler with electrodes unit
CN114278917B (zh) * 2022-03-04 2022-11-11 福建新瓦特科技有限公司 一种蒸汽产生系统的进水控制方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720583A1 (de) * 1987-06-22 1989-01-05 Riba Guenther Dampferzeuger mit abschlaemmvorrichtung
US4948947A (en) * 1988-07-26 1990-08-14 Pacific Steam Equipment, Inc. Steam boiler
US5189726A (en) * 1990-09-28 1993-02-23 Cts Costruzioni Techniche Sanmarinesi Steam producing apparatus for home use with low cold water reservoir level steam output stoppage
IT1278873B1 (it) * 1995-12-07 1997-11-28 Giuliano Franchini Caldaia a rapida produzione di vapore

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4356793A1 (en) * 2022-10-03 2024-04-24 Whirlpool Corporation Liquid level estimation in a steam generation system

Also Published As

Publication number Publication date
HRP20000246A2 (en) 2001-02-28
ATE226704T1 (de) 2002-11-15
DE69808955T2 (de) 2003-11-06
EP1019655A1 (en) 2000-07-19
WO1999017056A1 (en) 1999-04-08
DE69808955D1 (de) 2002-11-28
ES2184325T3 (es) 2003-04-01
AU9538498A (en) 1999-04-23
HRP20000246B1 (en) 2009-03-31
ITUD970173A1 (it) 1999-03-30
IT1295505B1 (it) 1999-05-12

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