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EP0820571A1 - Procede de remplissage automatique du reservoir d'un generateur de vapeur et dispositif servant a realiser ce procede - Google Patents

Procede de remplissage automatique du reservoir d'un generateur de vapeur et dispositif servant a realiser ce procede

Info

Publication number
EP0820571A1
EP0820571A1 EP96906875A EP96906875A EP0820571A1 EP 0820571 A1 EP0820571 A1 EP 0820571A1 EP 96906875 A EP96906875 A EP 96906875A EP 96906875 A EP96906875 A EP 96906875A EP 0820571 A1 EP0820571 A1 EP 0820571A1
Authority
EP
European Patent Office
Prior art keywords
liquid
tank
temperature
cell box
steam
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Withdrawn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
EP96906875A
Other languages
German (de)
English (en)
Inventor
Alfonso Fierro
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.)
Futura Steam Srl
Original Assignee
FUTURA STEAM 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 FUTURA STEAM Srl filed Critical FUTURA STEAM Srl
Publication of EP0820571A1 publication Critical patent/EP0820571A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to steam generator, in particular for housework, and concerns a method and device for carrying out automatically replenishment of the tanks of the steam generators during normal operation thereof .
  • This liquid can be water or solvent, such as trichloroethylene, in the case of for dry-cleaning machines .
  • the liquid that is to be turned into steam is contained inside a tank that is filled up to a predetermined level through a filler or, in bigger models, through an inlet pipe connected with a container or the water system.
  • heat generating means usually including an electric resistance set in direct contact with the liquid for heating thereof up to the temperature necessary to produce steam.
  • This replenishment device includes a float that is linked to a microswitch that is consequently operated as a consequence of the level change.
  • the microswitch in its turn, controls operation of an electric valve connected with a pipe for feeding liquid from an external source to the tank, thus allowing to restore the necessary level.
  • level control devices formed by a couple of electronic detectors, designed to sense the presence of liquid at a minimum level and a maximum level.
  • the steam generators of the above described examples feature some drawbacks, due, first of all, to the structure and position of the replenishment device.
  • the float is situated inside the tank, and this results in making difficult any maintenance and possible substitution operations.
  • the float is subjected to calcareous encrustations due to the action of water and overheated steam.
  • the level control device includes electronic detectors. This reduces their duration and increases considerably the necessity of periodic maintenance operations as well as power consumption.
  • the float indicating the differences in the liquid level needs a minimum quantity of water inside the tank, enough to allow it to be buoyant in every case.
  • the object of the present invention is to propose a method for checking and restoring the liquid level in a steam generator that allows tc maintain a small quantity of vaporisable liquid inside the tank, thus reducing power consumption.
  • a further object of the invention is to make a device that performs replenishment operation without any stop in steam production, that is almost in continuous way.
  • Another object of the present invention is to propose a device that carries out the above mentioned method and is simple, easy to install and maintain, very reliable and long-lasting.
  • each replenishment cycle includes: continuous temperature detection in a cell box situated outside the tank and set into communication therewith; allowing liquid supply to the tank, when liquid reaches a minimum level that causes raise of said temperature inside said cell box filled with steam, over a threshold temperature, by activation of liquid feeding means; cutting off liquid supply to the tank, when liquid reaches an operational level that causes drop of temperature inside the cell box (3) filled with the liquid, under the threshold temperature, by deactivation of the liquid feeding means .
  • the device that carries out the method includes one cell box situated outside the tank and set into communication therewith so as to allow liquid and steam to flow therethrough.
  • Temperature detector means placed close to the cell box for detection of the temperature of liquid or steam contained therein, activate and deactivate liquid feeding means for restoring the liquid level inside the tank, respectively if said temperature is lower or higher than a threshold temperature.
  • FIG. 1 shows a schematic perspective view of a steam generator equipped with the device being the subject of the present invention
  • - Figs. 2a, 2b and 2c show schematic lateral views of the replenishment device, in subsequent working steps;
  • - Fig. 3 shows a perspective view of a second embodiment of the replenishment device;
  • - Figs. 4a and 4b show a third embodiment of the same device.
  • a tank 1 being a part of the boiler of a steam generator, that is designed to produce steam by heating the vaporisable liquid contained inside the tank.
  • the liquid is heated by suitable heating means, not illustrated since they are known.
  • this tank 1 has a parallelepiped shape, however, it is obvious that the tank, for the present invention, can assume any form as much convenient.
  • the method and the device being the subject of the present invention can be extended to other machines for steam production, such as solvent distillers used for dry-cleaning.
  • the tank 1 In its upper part, the tank 1 features a supply inlet 5 and a steam outlet 6.
  • the first is designed to receive, when the steam generator is started, a suitable quantity of liquid sufficient to reach an operational level LO inside the tank 1.
  • the supply inlet 5 can be substituted for a feeding pipe connected, in a known way, with a container, or directly with the water system.
  • the operational level LO tends to decrease as a consequence of the steam production and subsequent liquid consumption.
  • the level can be very low, just enough to touch the above mentioned heating means.
  • the steam, as it is produced, can flow out of the tank through the steam outlet 6, and reach the apparatus that needs steam for its operation.
  • the replenishment device includes a cell box 3, situated outside the tank l in a lateral position with respect thereto.
  • a lower part of the cell box 3 is connected with the same tank l via a lower duct 4a, in a region situated below the minimum liquid level LM.
  • the upper part of the cell box 3 is also connected to the tank 1, but in a region over the operational level LO, via an upper duct 4b.
  • the cell box 3 can contain steam, or liquid and steam, at a level that in every moment coincides with the level in the tank 1.
  • a temperature detector 10 is connected with the cell box 3.
  • the temperature detector 10 is preferably constituted by a bulb thermostat and is introduced laterally into the cell box 3 in a position approximately intermediate between the operational level LO and the minimum level LM.
  • the indicator can be of any commonly known type, e.g. contact or pad thermostat.
  • the indicator can be of any commonly known type, e.g. contact or pad thermostat.
  • the liquid feeding means 30 includes an electric valve 31, controlled by the temperature detector 10 in order to allow or prevent liquid inlet into the cell box 3 through a feeding pipe 33, via an opening 34 made in the same cell box 3.
  • the valve is of a known type and has been schematically shown in Figs. 1 and 3, as an example, with its rear extremity stretching out from the outside of the cell box 3 in direction opposite to the electric valve 31 extension.
  • the electric valve 31 referred to in the present description can be also substituted, without invalidating the essence of the invention, for a pump of known type, likewise operated by the temperature detector 10, connected with a liquid container or directly with the water system.
  • the tank replenishment device features also timing means 7, including a push-button equipped with a manually operated timer, that opens the electric valve 31, or activates the pump, for a predetermined time, so as to allow a quantity of liquid enough to reach the operational level LO to go into the tank 1.
  • the timing means 7 are usually used, instead of the supply inlet 5, for introduction of liquid into the tank 1 when the steam generator is started.
  • Fig. 3 as an example, in the region of the electric valve 31, but it is obvious that they can be placed in any other convenient position.
  • a thermostat 10 is introduced directly in a recess 8 made in the side of the tank 1, in a position approximately intermediate between the operational level LO and the minimum level LM.
  • a liquid feeding pipe 33 is also provided for supplying refilling liquid in a region near the recess 8, so that the liquid flow laps the same recess 8. 2607 PCMB96/00279
  • the liquid is introduced manually, through the supply inlet 5; in the second embodiment the liquid is introduced as a consequence of timing means 7 activation (Fig. 3), and can be timed automatically or manually by an operator.
  • timing means 7 activation Fig. 3
  • the heating means inside the tank 1 are not activated yet, therefore the temperature T inside the same tank and the cell box 3, in the region of the thermostat 10, is certainly lower with respect to a threshold temperature TS necessary for thermostat switching, and consequently for the electric valve 31 activation.
  • the liquid has reached also the cell box 3 through the lower duct 4a, and is over the thermostat 10. Therefore, the above mentioned heating means, which bring the temperature of the liquid inside the tank 1 to a suitable level, are activated in known way so as to begin the production of steam, which is taken out, according to the needs, through the steam outlet 6.
  • the liquid temperature remains substantially constant during the steam production step, and anyway lower with respect to the steam temperature, which can be higher than the threshold temperature TS.
  • the temperature of the liquid in the cell box 3 is always lower with respect to the temperature of the liquid in the tank 1, because of the cell box form and location, as well as of limited thermal exchange with the same tank 1. Nevertheless, the temperature of the liquid in the cell box 3 is lower with respect to the threshold temperature TS that activates the thermostat 10, therefore the electric valve 31 is closed.
  • the working level LO tends to decrease due to the production and consumption of the steam.
  • the thermostat 10 emerges and is surrounded by the steam.
  • the steam temperature is higher than the liquid temperature and causes the heating of the same thermostat 10, thereby switching it.
  • the thermostat causes opening of the electric valve 31 that allows the introduction of the cold liquid into the cell box 3, causing the raising of the level in the same cell box, and therefore, also in the tank 1, until the operational level LO is reached again.
  • the thermostat 10 is again dipped in the liquid and the temperature T around the same thermostat lowers below the threshold temperature TS.
  • the working steps occur in analogous way. Difference consists in that, the cell box 3 is missing and the refill liquid is introduced into the tank 1 so as to touch the recess 8, so that the thermostat 10 detects the level difference directly inside the same tank.
  • the advantages of the present invention derive mainly from the bigger gradualness of introduction of the refill liquid into the tank 1, that allows steam production to be more constant and controlled to a bigger extent.
  • the access to the replenishment device is much easier and maintenance is simpler because all the working means of the same device are located outside the tank 1.
  • Bulb or pad thermostat, or any other possible temperature detector, are more reliable with respect to the floating devices and the feelers used in the known art.
  • Another advantage of the present replenishment method and device is that they permit to hold only a small quantity of liquid inside the tank 1 thus reducing warming up time and, at the same time, power consumption.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

A l'aide d'un détecteur (10) de température, on prend la température à l'intérieur d'un vase (3) communiquant avec le réservoir (1). Lorsque le niveau de liquide du vase atteint un niveau minimum (LM), le détecteur (10) de température est entouré de vapeur, la température de la vapeur étant plus élevée que celle du liquide, et active un dispositif (30) conçu pour acheminer le liquide dans le vase (3) et remplir ainsi le réservoir jusqu'à un niveau de fonctionnement (LO). Lorsque le liquide pénètre dans le vase, il refroidit le détecteur de température qui désactive le dispositif d'alimentation (30) de liquide, ce qui stoppe l'entrée du liquide froid dans le vase (3).
EP96906875A 1995-04-14 1996-04-04 Procede de remplissage automatique du reservoir d'un generateur de vapeur et dispositif servant a realiser ce procede Withdrawn EP0820571A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT95BO000168A IT1281772B1 (it) 1995-04-14 1995-04-14 Metodo per il controllo ed il ripristino del livello del liquido in un generatore di vapore, e dispositivo che attua tale metodo
ITBO950168 1995-04-14
PCT/IB1996/000279 WO1996032607A1 (fr) 1995-04-14 1996-04-04 Procede de remplissage automatique du reservoir d'un generateur de vapeur et dispositif servant a realiser ce procede

Publications (1)

Publication Number Publication Date
EP0820571A1 true EP0820571A1 (fr) 1998-01-28

Family

ID=11340520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96906875A Withdrawn EP0820571A1 (fr) 1995-04-14 1996-04-04 Procede de remplissage automatique du reservoir d'un generateur de vapeur et dispositif servant a realiser ce procede

Country Status (5)

Country Link
EP (1) EP0820571A1 (fr)
AU (1) AU5012496A (fr)
BR (1) BR9604892A (fr)
IT (1) IT1281772B1 (fr)
WO (1) WO1996032607A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3826072B2 (ja) * 2002-06-03 2006-09-27 アドバンスド エナジー ジャパン株式会社 液体材料気化供給装置
DE10302972B4 (de) * 2003-01-25 2007-03-08 Electrolux Home Products Corporation N.V. Verfahren und Vorrichtung zur Erzeugung von Wasserdampf für die Wäschepflege
EP2295855A1 (fr) 2009-08-18 2011-03-16 BSH Bosch und Siemens Hausgeräte GmbH Séparateur de vapeur et procédé de séparation de vapeur et eau dans un appareil de lavage du linge
EP2287583A1 (fr) 2009-08-18 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Capteur pour mesure la température d'un dispositif de chauffage dans un appareil de lave du linge, et générateur de vapeur
EP2287388A1 (fr) 2009-08-18 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Appareil d'injection de vapeur et appareil de traitment du linge comportant l'appareil d'injection de vapeur
EP2287390A1 (fr) 2009-08-18 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Procédé de fonctionnement d'un générateur de vapeur d'un appareil de traîtement du linge et appareil de traîtement du linge
EP2287389A1 (fr) 2009-08-18 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Agencement d'injection de vapeur à utiliser dans un appareil de traîtment du linge et un appareil de traîtment du linge
DE102009047154A1 (de) 2009-11-25 2011-06-16 BSH Bosch und Siemens Hausgeräte GmbH Wäschebehandlungsgerät mit einem Dampferzeuger und Verfahren zum Betreiben eines Wäschebehandlungsgeräts
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
DE102020113674A1 (de) 2020-05-20 2021-11-25 Miele & Cie. Kg Verfahren und Steuereinheit zum Bereitstellen von Dampf in einem Dampfkessel für eine Bügeleinrichtung, Dampfbereitstellungsvorrichtung und Bügeleinrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627015A (en) * 1948-08-23 1953-01-27 Electric Steam Cleaner Mfg Cor Electric steam generator and cleaner
IT1185051B (it) * 1985-03-08 1987-11-04 E G O Italiana Spa Apparecchio per generare del vapore,in particolare per dispositivi di cottura
DE3720583A1 (de) * 1987-06-22 1989-01-05 Riba Guenther Dampferzeuger mit abschlaemmvorrichtung
DE3767724D1 (de) * 1987-10-09 1991-02-28 Termozeta Elettrodomestici Spa Dampferzeuger mit druckselbstregelung, insbesondere fuer ein kleines elektrisches haushaltgeraet.
DE4304532A1 (de) * 1993-02-16 1994-08-18 Planeta Hausgeraete Verfahren und Vorrichtung zum Steuern der Wasserzufuhr zu einem Dampferzeuger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9632607A1 *

Also Published As

Publication number Publication date
ITBO950168A0 (it) 1995-04-14
IT1281772B1 (it) 1998-03-03
ITBO950168A1 (it) 1996-10-14
AU5012496A (en) 1996-10-30
BR9604892A (pt) 1998-05-19
WO1996032607A1 (fr) 1996-10-17

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