FR2757607A1 - Lime scale prevention device for probe of water level regulation system - Google Patents

Lime scale prevention device for probe of water level regulation system Download PDF

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Publication number
FR2757607A1
FR2757607A1 FR9616238A FR9616238A FR2757607A1 FR 2757607 A1 FR2757607 A1 FR 2757607A1 FR 9616238 A FR9616238 A FR 9616238A FR 9616238 A FR9616238 A FR 9616238A FR 2757607 A1 FR2757607 A1 FR 2757607A1
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FR
France
Prior art keywords
probe
water
rod
temperatures
water level
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.)
Pending
Application number
FR9616238A
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French (fr)
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to FR9616238A priority Critical patent/FR2757607A1/en
Priority to PCT/FR1998/000241 priority patent/WO1999040368A1/en
Publication of FR2757607A1 publication Critical patent/FR2757607A1/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • 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
    • 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
    • F22B37/78—Adaptations or mounting of level indicators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/12—Shape memory

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The device includes a stem (8) of shape memory metallic alloy. An end of the stem has two stable positions at two distinct temperatures. The extremity of the stem moves between the two distinct temperatures and positions so as to break a layer of limestone deposited on the stem. The two temperatures corresponding to the two stable positions of the extremity of the stem may be above and below a temperature of vaporisation of water. For example they may be eighty and one hundred and fifteen degrees Celsius respectively.

Description

DISPOSITIF INTERDISANT AU CALCAIRE DE SE FIXER
SUR LA SONDE D'UN SYSTEME DE RÉGULATION DE NIVEAU D'EAU
La présente invention a pour objet un dispositif interdisant au calcaire de se fixer sur la sonde d'un système de régulation de niveau d'eau.DEVICE PROHIBITING LIMESTONE FROM FIXING
ON THE PROBE OF A WATER LEVEL REGULATION SYSTEM
The subject of the present invention is a device preventing scale from attaching to the probe of a water level regulation system.

Il peut convenir à tous les types de chaudières utilisées pour de l'eau susceptible de contenir du calcaire, mais est surtout destiné aux générateurs de vapeur et en particulier à ceux que l'on trouve dans les appareils mobiles de nettoyage. It can be suitable for all types of boilers used for water likely to contain limestone, but is mainly intended for steam generators and in particular those found in mobile cleaning devices.

Les générateurs de vapeur sont généralement composés d'une chaudière raccordée par l'intermédiaire d'une pompe d'alimentation à un réservoir d'eau. Pour assurer un fonctionnement correct, le volume de remplissage d'eau de ces appareils est maintenu sensiblement constant, le plus souvent au moyen d'une sonde de niveau utilisant le principe de la conductivité électrique de l'eau et constituée d'une tige conductrice en acier inoxydable réalisant le contact entre l'eau et la carcasse de la chaudière. Lorsque la tige ne touche pas l'eau, le contact n'est pas établi, la pompe de remplissage de la chaudière fonctionne. Dès que le contact est établi, la pompe cesse de fonctionner. Steam generators generally consist of a boiler connected via a supply pump to a water tank. To ensure correct operation, the water filling volume of these devices is kept substantially constant, most often by means of a level probe using the principle of the electrical conductivity of water and consisting of a conductive rod. stainless steel making the contact between the water and the boiler casing. When the rod does not touch the water, contact is not established, the boiler filling pump is working. As soon as contact is made, the pump stops working.

Le problème majeur lié à cette technologie est que, au fur et à mesure que le calcaire se dépose, le contact se fait de plus en plus difficilement et l'eau monte de plus en plus haut dans la chaudière entraînant des perturbations de plus en plus gênantes de la marche de l'appareil.  The major problem with this technology is that, as the lime deposits, contact becomes more and more difficult and the water rises higher and higher in the boiler causing more and more disturbances interfering with the operation of the device.

Pour tenter de remédier à cet inconvénient, la demande de brevet NO FR 96 02 513, déposée par le même inventeur, décrit une chaudière réalisée en matière synthétique dont le niveau d'eau est contrôlé au moyen d'une sonde résistive de type canne alimentée par une tension inversée périodiquement dans le but d'empêcher les dépôts de calcaire sur la sonde. Cependant, ce dispositif nécessite un système d'alimentation électrique spécifique qui entraîne une augmentation du prix de revient de la chaudière. In an attempt to remedy this drawback, patent application NO FR 96 02 513, filed by the same inventor, describes a boiler made of synthetic material, the water level of which is controlled by means of a resistive probe of the cane type supplied by a voltage reversed periodically in order to prevent lime deposits on the probe. However, this device requires a specific electrical supply system which increases the cost price of the boiler.

Le dispositif selon la présente invention a pour objectif de remédier à cet état de choses. Il permet en effet d'empêcher efficacement les dépôts de calcaire sur la tige d'une sonde de niveau sans nécessiter d'équipements particuliers pour celle-ci, qui peut de ce fait être utilisée pour remplacer la sonde d'origine d'une chaudière existante sans entraîner de modifications ou d'adaptations. The device according to the present invention aims to remedy this state of affairs. It effectively prevents lime deposits on the rod of a level probe without requiring special equipment for it, which can therefore be used to replace the original probe of a boiler existing without causing modifications or adaptations.

I1 est constitué d'une sonde en alliage à mémoire de forme dont l'extrémité possède deux positions stables à deux températures distinctes, une température basse (environ 80 "C) et une température élevée (environ 115 OC), de façon à ce que le mouvement de l'extrémité de la sonde entre ces deux températures brise le calcaire se trouvant sur celle-ci et permette ainsi à la sonde de lire la présence de l'eau dès que celle-ci entre en contact avec elle. It consists of a shape memory alloy probe, the end of which has two stable positions at two distinct temperatures, a low temperature (about 80 "C) and a high temperature (about 115 OC), so that the movement of the end of the probe between these two temperatures breaks the limestone on it and thus allows the probe to read the presence of water as soon as it comes into contact with it.

Sur les dessins schématiques annexés, donnés à titre d'exemple non limitatif d'une des formes de réalisation de l'objet de la présente demande
la figure 1 est un schéma synoptique représentant le montage d'une sonde de niveau selon l'invention sur un générateur de vapeur,
et les figures 2 et 3 sont des coupes verticales, à une échelle différente, de la chaudière du générateur de vapeur montrant la configuration de la sonde de niveau à deux températures différentes.In the appended schematic drawings, given by way of nonlimiting example of one of the embodiments of the subject of the present application
FIG. 1 is a block diagram showing the mounting of a level probe according to the invention on a steam generator,
and Figures 2 and 3 are vertical sections, on a different scale, of the steam generator boiler showing the configuration of the level probe at two different temperatures.

Sur la figure 1 on peut voir un générateur de vapeur constitué d'une chaudière 1 alimentée par un réservoir 2 via une pompe 3, et équipée d'un corps de chauffe électrique 4 ainsi que d'une sonde 5 de niveau, la sortie de vapeur se faisant par une canalisation 6 pourvue d'une vanne 7. In Figure 1 we can see a steam generator consisting of a boiler 1 supplied by a tank 2 via a pump 3, and equipped with an electric heating body 4 and a level probe 5, the outlet of steam produced by a pipe 6 provided with a valve 7.

La sonde 5 est du type utilisant la conductivité électrique de l'eau. Elle comporte une tige 8 métallique reliée à un circuit électronique 9 déterminé pour arrêter la pompe 3 d'alimentation dès que l'eau 10 atteint la tige 8, ce qui établit le contact entre l'eau et la carcasse 11 de la chaudière, et pour remettre la pompe en route lorsque l'eau ne touche plus la tige. The probe 5 is of the type using the electrical conductivity of the water. It comprises a metal rod 8 connected to an electronic circuit 9 determined to stop the feed pump 3 as soon as the water 10 reaches the rod 8, which establishes the contact between the water and the carcass 11 of the boiler, and to restart the pump when the water no longer touches the stem.

Afin d'empêcher le calcaire de se fixer sur la tige 8 de la sonde 5, cette tige est fabriquée en alliage métallique à mémoire de forme, et construite de manière à ce que son extrémité possède deux positions stables à deux températures distinctes respectivement inférieure et supérieure à la température de vaporisation de l'eau, la température basse étant voisine de 80 OC, et la température élevée voisine de 115 OC.  In order to prevent the limestone from being fixed on the rod 8 of the probe 5, this rod is made of metal alloy with shape memory, and constructed in such a way that its end has two stable positions at two distinct temperatures respectively lower and higher than the water vaporization temperature, the low temperature being close to 80 OC, and the high temperature close to 115 OC.

Le mouvement de l'extrémité de la sonde entre ces deux températures aura pour effet de briser la couche de calcaire pouvant s'être déposée sur la tige 8, supprimant ainsi l'action isolante de cette couche et assurant le contact électrique entre la sonde et l'eau à un niveau constant. The movement of the end of the probe between these two temperatures will have the effect of breaking the layer of limestone which may have deposited on the rod 8, thus eliminating the insulating action of this layer and ensuring the electrical contact between the probe and water at a constant level.

Le positionnement des divers éléments constitutifs donne à l'objet de l'invention un maximum d'effets utiles qui n'avaient pas été, à ce jour, obtenus par des dispositifs similaires.  The positioning of the various constituent elements gives the object of the invention a maximum of useful effects which had not, to date, been obtained by similar devices.

Claims (3)

REVENDICATIONS 10. Dispositif interdisant au calcaire de se fixer sur la sonde d'un système de régulation de niveau d'eau, destiné d'une manière générale aux chaudières utilisées pour de l'eau susceptible de contenir du calcaire, et en particulier aux chaudières des générateurs de vapeur d'appareils mobiles de nettoyage, lesdites chaudières étant du type équipées d'une sonde utilisant le principe de la conductivité électrique de 1 'eau,  10. Device preventing scale from attaching to the probe of a water level control system, generally intended for boilers used for water likely to contain limestone, and in particular for boilers of steam generators of mobile cleaning appliances, said boilers being of the type fitted with a probe using the principle of electrical conductivity of water, caractérisé en ce que la sonde (5) comporte une tige (8) en alliage métallique conducteur à mémoire de forme, dont l'extrémité possède deux positions stables à deux températures distinctes. characterized in that the probe (5) comprises a rod (8) of conductive metal alloy with shape memory, the end of which has two positions stable at two distinct temperatures. 20. Dispositif selon la revendication 1, se caractérisant par le fait que la tige (8) est agencée de manière à ce que le mouvement de son extrémité entre les deux températures distinctes soit apte à briser la couche de calcaire pouvant s'être déposée sur ladite tige. 20. Device according to claim 1, characterized in that the rod (8) is arranged so that the movement of its end between the two distinct temperatures is capable of breaking the layer of limestone which may have deposited on said rod. 30. Dispositif selon l'une quelconque des revendications précédentes, se caractérisant par le fait que les deux températures correspondant aux deux positions stables de l'extrémité de la tige (8) sont respectivement inférieure et supérieure à la température de vaporisation de l'eau. 30. Device according to any one of the preceding claims, characterized in that the two temperatures corresponding to the two stable positions of the end of the rod (8) are respectively lower and higher than the vaporization temperature of the water . 40. Dispositif selon la revendication 3, se caractérisant par le fait que les deux températures correspondant aux deux positions stables de l'extrémité de la tige (8) sont respectivement voisines de 80 C et de 115 OC.  40. Device according to claim 3, characterized in that the two temperatures corresponding to the two stable positions of the end of the rod (8) are respectively close to 80 C and 115 OC.
FR9616238A 1996-12-24 1996-12-24 Lime scale prevention device for probe of water level regulation system Pending FR2757607A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9616238A FR2757607A1 (en) 1996-12-24 1996-12-24 Lime scale prevention device for probe of water level regulation system
PCT/FR1998/000241 WO1999040368A1 (en) 1996-12-24 1998-02-09 Device for preventing scaling on a water level regulating system probe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9616238A FR2757607A1 (en) 1996-12-24 1996-12-24 Lime scale prevention device for probe of water level regulation system
PCT/FR1998/000241 WO1999040368A1 (en) 1996-12-24 1998-02-09 Device for preventing scaling on a water level regulating system probe

Publications (1)

Publication Number Publication Date
FR2757607A1 true FR2757607A1 (en) 1998-06-26

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Application Number Title Priority Date Filing Date
FR9616238A Pending FR2757607A1 (en) 1996-12-24 1996-12-24 Lime scale prevention device for probe of water level regulation system

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FR (1) FR2757607A1 (en)
WO (1) WO1999040368A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105202511B (en) * 2015-10-26 2017-10-13 中国船舶重工集团公司第七一八研究所 Confined space vapor continuous generator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01163623A (en) * 1987-12-21 1989-06-27 Matsushita Electric Ind Co Ltd Steam generator
EP0323939A1 (en) * 1988-01-08 1989-07-12 SOCIETE COOPERATIVE DE PRODUCTION BOURGEOIS (Société Coopérative de Production Anonyme à Capital Variable) Steam generator for a cooking device
FR2745169A1 (en) 1996-02-23 1997-08-29 Vap Ind France Sa Domestic combined vacuum and steam cleaner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8531210D0 (en) * 1985-12-18 1986-01-29 Still & Sons Ltd W M Electric water heating element
IT1238286B (en) * 1990-03-26 1993-07-12 LIQUID LEVEL SENSOR DEVICE FOR STEAM BOILERS.
FR2704559B1 (en) * 1993-04-28 1995-07-07 Seb Sa DEVICE FOR REMOVING SCALE FOR IMPROVING THE SAFETY OF CONTAINERS USED FOR HEATING WATER.
FR2725642B1 (en) * 1994-10-17 1997-01-17 Grandperret Gilles Maurice METHOD OF CLEANING BY MAINTAINED MECHANICAL VIBRATIONS OF A MATERIAL COVERED WITH A LAYER OF PARASITIC MATERIALS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01163623A (en) * 1987-12-21 1989-06-27 Matsushita Electric Ind Co Ltd Steam generator
EP0323939A1 (en) * 1988-01-08 1989-07-12 SOCIETE COOPERATIVE DE PRODUCTION BOURGEOIS (Société Coopérative de Production Anonyme à Capital Variable) Steam generator for a cooking device
FR2745169A1 (en) 1996-02-23 1997-08-29 Vap Ind France Sa Domestic combined vacuum and steam cleaner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 430 (P - 937) 26 September 1989 (1989-09-26) *

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Publication number Publication date
WO1999040368A1 (en) 1999-08-12

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