EP1046730B1 - Device for the cathodic protection of a water heater, hot water supply or similar reservoir - Google Patents

Device for the cathodic protection of a water heater, hot water supply or similar reservoir Download PDF

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Publication number
EP1046730B1
EP1046730B1 EP00400397A EP00400397A EP1046730B1 EP 1046730 B1 EP1046730 B1 EP 1046730B1 EP 00400397 A EP00400397 A EP 00400397A EP 00400397 A EP00400397 A EP 00400397A EP 1046730 B1 EP1046730 B1 EP 1046730B1
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EP
European Patent Office
Prior art keywords
insulating element
anode
screen
means forming
auxiliary cap
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
EP00400397A
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German (de)
French (fr)
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EP1046730A1 (en
Inventor
Yves Lepelletier
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.)
Atlantic Francaise De Developpment Thermique Ste
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Atlantic Francaise De Developpment Thermique Ste
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto

Definitions

  • the auxiliary cap 7 is mounted tight around the plug 5 made of material elastomer.
  • the noble metal anode 3 opens through an orifice 8 of the cap auxiliary 7 in the tank water.

Abstract

Device comprises a column (1) having at its end a insulating element (5) supporting a non-consumable anode (3). Protective sealing sheath (6) is placed between anode (3) and insulating element (5) inside the container to eliminate electrolytic oxidati of the insulating element (5) which is joined to a screen (7) to avoid electrochemical corrosion on the insulating element surfa (5). The screen (7) can be in the form of a cap surrounding and compressing most of the insulating element (5) and has an orific for the non-consumable anode.

Description

L'invention est relative à un dispositif de protection cathodique de cuve de chauffe-eau, de préparateur d'eau chaude ou réservoir analogue.The invention relates to a cathodic tank protection device water heater, hot water tank or similar tank.

Le document EP 0 771 889 A1 décrit un dispositif de protection cathodique de chauffe-eau dans lequel une anode est fixée sur un doigt de gant tubulaire par l'intermédiaire d'un élément isolant, ledit élément isolant étant traversé par ladite anode. L'anode est une anode non consommable, réalisée de préférence en matériau métallique. Un circuit électronique est relié à l'anode non consommable par un conducteur isolé intérieur au doigt de gant.The document EP 0 771 889 A1 describes a cathodic protection device of a water heater in which an anode is fixed to a tubular thermowell by through an insulating element, said insulating element being traversed by said anode. The anode is a non-consumable anode, preferably made of material metallic. An electronic circuit is connected to the non-consumable anode by a insulated conductor inside the thermowell.

Ce dispositif donne généralement satisfaction. Pour en augmenter la fiabilité, la demande de brevet français 98.04904 non publiée à la date de dépôt de la présente demande décrit un perfectionnement, obtenu par le placement d'une gaine étanche de protection entre l'anode et l'élément isolant.This device generally gives satisfaction. To increase reliability, French patent application 98.04904 not published on the date of filing of this application describes an improvement, obtained by placing a tight sheath of protection between the anode and the insulating element.

Ce dispositif perfectionné permet de réduire notablement le risque d'oxydation électrolytique de l'élément isolant, en particulier à proximité de l'emplacement traversé par l'anode non consommable, tout en assurant un maintien et une étanchéité sous pression satisfaisante.This improved device significantly reduces the risk of electrolytic oxidation of the insulating element, in particular near the location crossed by the non-consumable anode, while ensuring maintenance and a seal under satisfactory pressure.

L'invention a pour but d'améliorer la protection de l'élément isolant, non seulement contre l'oxydation électrolytique induite par le courant de protection cathodique, mais également contre toute éventuelle altération chimique à l'intérieur d'une cuve de chauffe-eau électrique, de préparateur d'eau chaude sanitaire, ou de tout autre réservoir de stockage analogue bénéficiant d'une protection cathodique, et pouvant recevoir des eaux agressives.The invention aims to improve the protection of the insulating element, not only against electrolytic oxidation induced by the protective current cathodic, but also against any possible chemical alteration inside an electric water heater, a domestic hot water tank, or a any other similar storage tank benefiting from cathodic protection, and can receive aggressive water.

L'invention a pour objet un dispositif de protection cathodique de cuve de chauffe-eau, de préparateur d'eau chaude, ou de réservoir analogue, du type comportant un doigt de gant portant à son extrémité un élément isolant de support d'une anode non consommable, dans lequel une gaine étanche de protection est placée entre l'anode et l'élément isolant à l'intérieur de la cuve, de manière à éliminer le risque d'oxydation électrolytique de l'élément isolant, caractérisé en ce que l'élément isolant est associé à un moyen formant écran, de manière à éviter l'altération électrochimique en surface de l'élément isolant.The subject of the invention is a cathodic protection device for water heater, hot water tank, or similar tank, of the type comprising a thermowell carrying at its end an insulating support element a non-consumable anode, in which a tight protective sheath is placed between the anode and the insulating element inside the tank, so as to eliminate the risk of electrolytic oxidation of the insulating element, characterized in that the insulating element is associated with a screen means, so as to avoid electrochemical alteration at the surface of the insulating element.

Selon d'autres caractéristiques alternatives de l'invention :

  • le moyen formant écran comporte une partie en forme de disque ou de rondelle percée enfilée sur l'anode et plaquée au contact de l'élément isolant,
  • le moyen formant écran comporte un revêtement présentant une bonne résistance aux agressions électrochimiques,
  • le moyen formant écran est surmoulé au moins partiellement sur l'anode non consommable,
  • le moyen formant écran est solidaire de la gaine étanche de protection entourant l'anode,
  • le moyen formant écran est constitué sous forme d'un capuchon auxiliaire entourant la majeure partie de l'élément isolant de support,
  • le moyen formant écran est monté sur l'élément isolant de support, de manière à le mettre en compression,
  • le capuchon auxiliaire présente un orifice de passage de l'anode non consommable,
  • le capuchon auxiliaire présente une partie supérieure de contour intérieur adapté au contour extérieur de l'élément isolant,
    •
    • le capuchon auxiliaire présente une partie inférieure sensiblement cylindrique.
    According to other alternative characteristics of the invention:
    • the screen-forming means comprises a part in the form of a disc or of a pierced washer threaded onto the anode and pressed in contact with the insulating element,
    • the screen means comprises a coating having good resistance to electrochemical attack,
    • the screen means is at least partially molded onto the non-consumable anode,
    • the screen means is integral with the sealed protective sheath surrounding the anode,
    • the screen means consists of an auxiliary cap surrounding the major part of the insulating support element,
  • the screen means is mounted on the insulating support element, so as to put it in compression,
  • the auxiliary cap has a non-consumable anode passage orifice,
  • the auxiliary cap has an upper part with an internal contour adapted to the external contour of the insulating element,
    • the auxiliary cap has a substantially cylindrical lower part.

    L'invention sera mieux comprise grâce à la description qui va suivre donnée à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels :

    • la figure 1 représente schématiquement une vue partielle en section diamétrale d'un dispositif selon l'invention,
    • la figure 2 représente schématiquement une vue en section diamétrale d'un élément de protection d'un dispositif selon l'invention,
    • la figure 3 représente schématiquement une vue en perspective de l'élément de la figure 2.
    The invention will be better understood from the description which follows given by way of nonlimiting example with reference to the appended drawings in which:
    • FIG. 1 schematically represents a partial view in diametral section of a device according to the invention,
    • FIG. 2 schematically represents a view in diametral section of a protective element of a device according to the invention,
    • FIG. 3 schematically represents a perspective view of the element of FIG. 2.

    En référence à la figure 1, un dispositif selon l'invention comporte un doigt de gant 1 généralement métallique à l'intérieur duquel passe un conducteur 2 de polarisation d'une anode 3 en métal noble. L'anode 3 en métal noble est reliée au conducteur isolé 2 par l'intermédiaire d'une connexion 4. La partie inférieure de l'anode 3 débouche à l'intérieur du doigt de gant tubulaire 1, tandis que la partie supérieure de l'anode 3 débouche dans la cuve de chauffe-eau, de préparateur d'eau chaude ou réservoir analogue.Referring to Figure 1, a device according to the invention comprises a finger generally metallic glove 1 inside which a conductor 2 of polarization of an anode 3 of noble metal. The noble metal anode 3 is connected to the insulated conductor 2 via a connection 4. The lower part of the anode 3 opens out inside the tubular thermowell 1, while the part top of anode 3 opens into the tank of water heater, water preparer hot or similar tank.

    Pour assurer l'étanchéité de la cuve de chauffe-eau et l'isolation électrique de l'anode 3 par rapport au doigt de gant tubulaire, on monte un élément 5 de support isolant à l'extrémité du doigt de gant tubulaire 1. L'élément 5 de support isolant est constitué sous forme d'un bouchon protecteur réalisé en matériau élastomère ou analogue. Le bouchon protecteur 5 est traversé par l'anode métallique 3. Pour éliminer le risque d'oxydation électrolytique du bouchon protecteur 5, on prévoit selon l'enseignement de la demande de brevet français 98.04904 déposée le 20 avril 1998, de placer une gaine étanche 6 de protection au voisinage de l'emplacement où l'anode métallique 3 débouche à l'extérieur du bouchon 5 en matériau élastomère.To ensure the tightness of the water heater tank and the electrical insulation of the anode 3 relative to the tubular thermowell, a support element 5 is mounted insulator at the end of the tubular thermowell 1. The insulating support element 5 is consisting of a protective cap made of elastomeric material or similar. The protective cap 5 is crossed by the metal anode 3. For eliminate the risk of electrolytic oxidation of the protective cap 5, provision is made according to the teaching of French patent application 98.04904 filed on April 20, 1998, to place a tight protective sheath 6 in the vicinity of the location where the metal anode 3 opens to the outside of the plug 5 in elastomeric material.

    Cette disposition limite la protection au voisinage dudit emplacement. Pour compléter cette protection et éviter une possible altération de surface du bouchon 5 à l'intérieur de la cuve de chauffe-eau ou de préparateur d'eau chaude, on dispose, selon l'invention , un écran auxiliaire 7 de protection entre l'eau contenue dans la cuve et la surface extérieure à protéger du bouchon 5.This provision limits protection in the vicinity of said location. For complete this protection and avoid possible alteration of the surface of the plug 5 to inside the tank of water heater or hot water tank, we have, according to the invention, an auxiliary screen 7 for protection between the water contained in the tank and the external surface to be protected from the cap 5.

    L'écran protecteur 7 est dans l'exemple représenté constitué sous forme d'un capuchon supplémentaire réalisé en matériau présentant une bonne résistance aux agressions chimiques, une bonne résistance à l'hydrolyse et une reprise d'humidité faible, des caractéristiques mécaniques et thermiques suffisantes pour une utilisation en continu à température élevée dans un milieu agressif. De préférence, le matériau de l'écran protecteur 7 est utilisable au contact de l'eau potable.The protective screen 7 is in the example shown constituted in the form of a additional cap made of material with good resistance to chemical attack, good resistance to hydrolysis and moisture uptake low, mechanical and thermal characteristics sufficient for use continuously at high temperature in an aggressive environment. Preferably, the material of the protective screen 7 can be used in contact with drinking water.

    Le capuchon auxiliaire 7 est monté serré autour du bouchon 5 en matériau élastomère. L'anode 3 en métal noble débouche à travers un orifice 8 du capuchon auxiliaire 7 dans l'eau de la cuve. The auxiliary cap 7 is mounted tight around the plug 5 made of material elastomer. The noble metal anode 3 opens through an orifice 8 of the cap auxiliary 7 in the tank water.

    Ce mode particulier de réalisation permet la protection du bouchon élastomère 5 contre toute altération de surface éventuelle susceptible d'être provoquée par la polarisation cathodique de l'eau de la cuve engendrée par le courant d'anode, en particulier pour des valeurs électrochimiques extrêmes des eaux à haute température. En outre, la mise en compression du matériau élastomère du bouchon 5 améliore le comportement au vieillissement du matériau élastomère et permet d'augmenter sa durée d'utilisation.This particular embodiment allows the protection of the plug. elastomer 5 against any possible surface alteration likely to be caused by the cathodic polarization of the tank water generated by the current anode, in particular for extreme electrochemical values of high water temperature. In addition, the compression of the elastomeric material of the plug 5 improves the aging behavior of the elastomeric material and allows increase its duration of use.

    Selon une autre variante de réalisation non représentée, le capuchon auxiliaire 7 peut être directement surmoulé sur l'anode 3 en métal noble. Dans ce cas, on prévoit de réaliser la structure du capuchon 7 dans le même matériau que la gaine 6 en réalisant les deux pièces 6 et 7 dans la même matière et d'un seul tenant.According to another alternative embodiment not shown, the auxiliary cap 7 can be directly overmolded on the noble metal anode 3. In this case, we plans to make the structure of the cap 7 in the same material as the sheath 6 by making the two parts 6 and 7 in the same material and in one piece.

    Selon encore une autre variante de réalisation, on réalise un capuchon auxiliaire 7 plus épais et on diminue le bouchon élastomère 5 pour réaliser uniquement la fonction d'étanchéité : le bouchon élastomère 5 peut alors être remplacé par des joints d'étanchéité de type torique ou à lèvre indépendants ou surmoulés à l'intérieur du capuchon auxiliaire 7.According to yet another alternative embodiment, a cap is produced thicker auxiliary 7 and the elastomer plug 5 is reduced to make only the sealing function: the elastomer plug 5 can then be replaced by independent O-ring or lip seals or molded inside the auxiliary cap 7.

    On peut également remplacer le capuchon auxiliaire 7 par un revêtement externe de même fonction, tel qu'une peinture, un vernis ou un revêtement insensible et résistant à toute agression physique ou chimique provenant de l'activité de l'anode, tel qu'un revêtement fluoré.You can also replace the auxiliary cap 7 with a coating external of the same function, such as paint, varnish or insensitive coating and resistant to any physical or chemical attack from the activity of the anode, such as a fluorinated coating.

    Enfin, dans le cas d'une eau peu agressive, le capuchon 7 peut se réduire à un disque ou rondelle percée placée à l'emplacement de la gaine 6 en étant plaquée au sommet du bouchon élastomère 5. Pour assurer correctement ce plaquage, on prévoit avantageusement de coller ce disque ou rondelle percée, ou de surmouler ce disque d'un seul tenant avec la gaine 6 d'isolation sur l'anode métallique 3.Finally, in the case of less aggressive water, the cap 7 can be reduced to a disc or perforated washer placed at the location of the sheath 6 while being pressed against the top of the elastomeric plug 5. To ensure this plating correctly, provision is made advantageously to glue this disc or pierced washer, or to overmold this disc in one piece with the insulation sheath 6 on the metal anode 3.

    En référence aux figures 2 et 3, le capuchon auxiliaire 7 se présente sous la forme d'une coque symétrique comportant une partie supérieure 9, une partie médiane 10 et une partie inférieure 11.With reference to FIGS. 2 and 3, the auxiliary cap 7 is presented under the shape of a symmetrical shell comprising an upper part 9, a part middle 10 and lower part 11.

    La partie supérieure 9 est sensiblement en forme de calotte sphérique et présente une épaisseur suffisante pour résister à l'effort de compression du bouchon élastomère 5 sur lequel elle est appliquée par son contour intérieur. The upper part 9 is substantially in the form of a spherical cap and has sufficient thickness to withstand the compression force of the plug elastomer 5 to which it is applied by its internal contour.

    Pour permettre un bon engagement de l'anode 3 pourvue de sa gaine 6 à travers l'orifice 8, on donne de préférence à l'orifice 8 une forme évasée du côté intérieur, de manière à guider l'anode 3 à travers l'orifice 8, puis à serrer étroitement la gaine 6 selon un assemblage sensiblement étanche avec la partie supérieure cylindrique de l'orifice 8.To allow good engagement of the anode 3 provided with its sheath 6 to through orifice 8, preferably orifice 8 is given a flared shape on the side inside, so as to guide the anode 3 through the orifice 8, then to tighten tightly the sheath 6 in a substantially sealed assembly with the upper part orifice 8.

    La partie médiane 10 présente un côté intérieur sensiblement tronconique qui se raccorde à l'intérieur de la calotte sphérique 9 et une surface extérieure sensiblement cylindrique : il résulte de cette disposition que l'épaisseur de la partie médiane 10 décroít en direction de l'extrémité inférieure du bouchon 5.The middle part 10 has a substantially frustoconical inner side which connects inside the spherical cap 9 and an outer surface substantially cylindrical: it follows from this arrangement that the thickness of the part median 10 decreases towards the lower end of the plug 5.

    La partie inférieure 11 est sensiblement cylindrique, de manière à comprimer radialement le bouchon élastomère 5 en évacuant toute quantité de liquide susceptible de s'engager entre le bouchon élastomère 5 et le capuchon auxiliaire 7.The lower part 11 is substantially cylindrical, so as to compress radially the elastomeric plug 5, evacuating any quantity of liquid likely to engage between the elastomer plug 5 and the auxiliary cap 7.

    L'invention décrite en référence à un mode de réalisation particulier n'y est nullement limitée, mais couvre au contraire toute modification de forme et toute variante de réalisation dans le cadre et l'esprit de l'invention.The invention described with reference to a particular embodiment is not there in no way limited, but on the contrary covers any modification of form and any variant in the context and spirit of the invention.

    Claims (10)

    1. Device for the cathodic protection of a water heater, hot water supply or similar reservoir, of the type comprising a thermowell (1) bearing on its extremity an insulating element (5) supporting a non-consumable anode (3), in which a watertight protective tube (6) is placed between the anode (3) and the insulating element (5) inside the reservoir so as to eliminate the risk of electrolytic oxidation of the insulating element (5), characterised in that the insulating element (5) is associated with a means forming a screen (7) so as to avoid electrochemical alteration of the surface of the insulating element (5).
    2. Device according to claim 1, characterised in that the means forming the screen comprises a part in the form of a pierced disc or washer threaded onto the anode (3) and flush against the contact of the insulating element (5).
    3. Device according to claim 1, characterised in that the means forming the screen comprises a coating which displays good resistance to electrochemical corrosion.
    4. Device according to claim 1, characterised in that the means forming the screen is at least partially moulded onto the non-consumable anode (3).
    5. Device according to claim 1, characterised in that the means forming the screen is integral to the watertight protective tube (6) surrounding the anode (3).
    6. Device according to claim 1, characterised in that the means forming the screen (7) is made in the form of an auxiliary cap (7) surrounding the major part of the insulating element (5) of support.
    7. Device according to claim 6, characterised in that the means forming the screen (7) is mounted on the insulating element (5) of support, in such a way as to compress it.
    8. Device according to claim 6 or claim 7, characterised in that the auxiliary cap (7) presents an opening (8) through which the anode (3) passes.
    9. Device according to claim 6 or claim 7, characterised in that the auxiliary cap (7) presents an upper part (9) with an interior contour adapted to the external contour of the insulating element (5).
    10. Device according to claim 6 or claim 7, characterised in that the auxiliary cap (7) presents a lower part (11) which is essentially cylindrical.
    EP00400397A 1999-04-23 2000-02-11 Device for the cathodic protection of a water heater, hot water supply or similar reservoir Expired - Lifetime EP1046730B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9905159A FR2792654B1 (en) 1999-04-23 1999-04-23 DEVICE FOR THE CATHODIC PROTECTION OF A WATER HEATER TANK, A HOT WATER PREPARER OR THE LIKE
    FR9905159 1999-04-23

    Publications (2)

    Publication Number Publication Date
    EP1046730A1 EP1046730A1 (en) 2000-10-25
    EP1046730B1 true EP1046730B1 (en) 2003-10-22

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    ID=9544782

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00400397A Expired - Lifetime EP1046730B1 (en) 1999-04-23 2000-02-11 Device for the cathodic protection of a water heater, hot water supply or similar reservoir

    Country Status (5)

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    EP (1) EP1046730B1 (en)
    AT (1) ATE252654T1 (en)
    DE (1) DE60006020T2 (en)
    ES (1) ES2209771T3 (en)
    FR (1) FR2792654B1 (en)

    Families Citing this family (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    RU2476622C1 (en) * 2011-07-06 2013-02-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уфимский государственный нефтяной технический университет" Assembly method of subsurface anodic ground wire, quickly assembled device for its implementation; ground wire electrode
    CN111286741A (en) * 2020-03-24 2020-06-16 中核核电运行管理有限公司 Floating type auxiliary anode mounting and fixing device

    Family Cites Families (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB9520588D0 (en) * 1995-10-09 1995-12-13 Raychem Sa Nv Corrosion protection and electrical grounding
    FR2740784B1 (en) * 1995-11-02 1998-01-02 Atlantic Soc Fr Dev Thermique DEVICE FOR THE CATHODIC PROTECTION OF A WATER HEATER TANK AND A WATER HEATER PROVIDED WITH SUCH A DEVICE

    Also Published As

    Publication number Publication date
    FR2792654A1 (en) 2000-10-27
    ES2209771T3 (en) 2004-07-01
    DE60006020D1 (en) 2003-11-27
    DE60006020T2 (en) 2004-06-24
    EP1046730A1 (en) 2000-10-25
    ATE252654T1 (en) 2003-11-15
    FR2792654B1 (en) 2001-08-03

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