EP1019655A1 - Verfahren zum wiederherstellen des wasserstandes in kesseln von dampferzeugermaschinen - Google Patents

Verfahren zum wiederherstellen des wasserstandes in kesseln von dampferzeugermaschinen

Info

Publication number
EP1019655A1
EP1019655A1 EP98948940A EP98948940A EP1019655A1 EP 1019655 A1 EP1019655 A1 EP 1019655A1 EP 98948940 A EP98948940 A EP 98948940A EP 98948940 A EP98948940 A EP 98948940A EP 1019655 A1 EP1019655 A1 EP 1019655A1
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.)
Granted
Application number
EP98948940A
Other languages
English (en)
French (fr)
Other versions
EP1019655B1 (de
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/de
Application granted granted Critical
Publication of EP1019655B1 publication Critical patent/EP1019655B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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.
  • Such an automatic refilling or supply of additional water does not provide to fill the boiler for the whole or for the most part of its capacity, as it normally happens by the manual filling, but provides for the introduction of a little quantity of water to ensure that the temperature in the boiler does not drop substantially because of the introduction of a great quantity of cool water.
  • Such a solution has the advantage, as said before, to spare the waiting times between the fillings of the boiler and to avoid the manual filling, but has the disadvantage that just a part of the power of the resistor is used to generate steam, since part of said power is used to heat the new cool water which, even if in little quantities, is each time introduced by the pump.
  • the generator using such an automatic refilling system is able to generate less steam than a generator with a manual refilling in which, once the water has reached the evaporation temperature, the whole power is used to generate steam.
  • a generator equipped with a manual refilling system has the disadvantage of the waiting times necessary to make said refilling.
  • Object of the present invention is therefore to provide for a process for the restoring the level of water in boilers of steam generating machines which consents to control the operation of the pump and to guarantee with extreme precision, and under any circumstance, the reaching of the desired level of water within the boiler.
  • the invention foresees the use of an auxiliary tank through which the boiler is filled by controlled operation of the restoration pump.
  • the functioning of the pump is operatively connected with a pressure measuring device arranged at the interior of the boiler; said measuring device is normally a component with which the boiler is usually provided.
  • the signal of the instantaneous pressure in the boiler controls the functioning of the pump, which changes its flow rate features according to said pressure and according to the typology of the pressure flow rate curve typical of the kind of pump used.
  • the correction of the pump flow rate features according to the pressure can occur with the desired frequency according to the continuous changing of the pressure itself as the restoring stage (refilling with water) goes on.
  • the water quantity fed into the boiler is constantly and substantially continuously checked, assuring with extreme precision the reaching of the desired level and so ensuring working conditions always optimal of the appliance connected to the steam generating machine.
  • a flow rate reader connected in feedback to the pump control system.
  • the real flow rate of the pump is continuously checked and the changes in said flow rate due to the pressure unstable conditions within the boiler are corrected in feedback by acting on the pump control system to constantly obtain controlled filling conditions.
  • the pump is operatively connected to a maximum level sensor providing for its disconnection as soon as said maximum level is reached.
  • Figure 1 schematically shows the means for carrying out the process for restoring the level of water in boilers of steam generating machines according to the invention
  • Figure 2 shows a modified embodiment of the invention.
  • 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 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 flow rate according to the value of said pressure.
  • the flow rate of the pump 13 is in fact 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 control 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.
  • said variation 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 delivery features of the pump 13 in order to obtain the desired and precise filling under any operating condition.
  • a level sensor 22 connected in feedback to the control and activation system 17, which provides to stop the pump 13 as soon the level L1 is reached.

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 Verfahren zum wiederherstellen des wasserstandes in kesseln von dampferzeugermaschinen Expired - Lifetime EP1019655B1 (de)

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 true EP1019655A1 (de) 2000-07-19
EP1019655B1 EP1019655B1 (de) 2002-10-23

Family

ID=11422470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98948940A Expired - Lifetime EP1019655B1 (de) 1997-09-30 1998-09-08 Verfahren zum wiederherstellen des wasserstandes in kesseln von dampferzeugermaschinen

Country Status (8)

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

Families Citing this family (8)

* 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
WO2014087190A1 (en) 2012-12-05 2014-06-12 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
US20240110697A1 (en) * 2022-10-03 2024-04-04 Whirlpool Corporation Liquid level estimation in a steam generation system

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9917056A1 *

Also Published As

Publication number Publication date
HRP20000246B1 (en) 2009-03-31
WO1999017056A1 (en) 1999-04-08
HRP20000246A2 (en) 2001-02-28
AU9538498A (en) 1999-04-23
DE69808955T2 (de) 2003-11-06
DE69808955D1 (de) 2002-11-28
EP1019655B1 (de) 2002-10-23
ITUD970173A1 (it) 1999-03-30
IT1295505B1 (it) 1999-05-12
ES2184325T3 (es) 2003-04-01
ATE226704T1 (de) 2002-11-15

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