EP0952240B1 - Dispositif de protection cathodique de cuve de chauffe-eau - Google Patents
Dispositif de protection cathodique de cuve de chauffe-eau Download PDFInfo
- Publication number
- EP0952240B1 EP0952240B1 EP99400509A EP99400509A EP0952240B1 EP 0952240 B1 EP0952240 B1 EP 0952240B1 EP 99400509 A EP99400509 A EP 99400509A EP 99400509 A EP99400509 A EP 99400509A EP 0952240 B1 EP0952240 B1 EP 0952240B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- anode
- insulating member
- tank
- protective sheath
- titanium
- 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
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Classifications
-
- 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 invention relates to a cathodic protection device for water heater.
- thermowell is carried by a flange closing the tank of the water heater; this thermowell carries at its end a insulating support element for a non-consumable anode; said insulating element is through which said non-consumable anode so as to connect the non-consumable anode consumable to an electronic circuit thanks to an insulated conductor inside said audit glove finger.
- This device is generally satisfactory, but presents the risk of degradation of the insulating support element by electrolytic oxidation of the water in the tank.
- the object of the invention is to remedy this drawback, by improving the existing device, increasing the reliability and duration of use of the element support insulator.
- the subject of the invention is a cathodic protection device for water heater, of the type comprising a tubular thermowell carrying at its end a insulating support element for a non-consumable anode, characterized in that a waterproof protective sheath is placed inside the tank, between the anode and the insulating element, so as to avoid degradation of the insulating element by electrolytic oxidation of the tank water.
- a device according to the invention comprises a generally metallic thermowell 1, carrying an assembly with an element of insulating support 2 of an anode 3 of noble metal.
- the noble metal anode 3 passes through the insulating support element 2 and is connected to a connector 4 connecting the metal anode 3 to a conductive wire insulated electric 5.
- metallic material usable for anode 3 one can choose a material in the group comprising passivated ferritic stainless steels externally by electrochemical passivation, austenitic stainless steels externally passivated by electrochemical passivation, aluminum, ferrosilicon, platinum titanium, platinum niobium, platinum titanium and coated titanium a layer of metal oxide coating.
- an anode is used 3 made of titanium or titanium coated on the outside with a metal oxide.
- the anode 3 is connected by the connector 4 and the insulated conductor 5 to a current generator of a type known per se, for example type described in document EP 0 771 889 A1.
- the end of the insulating support element 2 is attacked by electrolytic oxidation resulting from the passage of cathodic protection current in the tank water and disintegrates at the location where the anode 3 opens the insulating support element 2. This disintegration releases 6 small particles size which spread in the water of the tank for example by following the path of arrows 7.
- This disaggregation is important for insulating support elements constituted by a protective cap made of elastomeric material.
- a sealed protective sheath 8 is provided to be placed between the anode 3 and the insulating element 2, so as to avoid degradation of the insulating element 2 by electrolytic oxidation of the tank water.
- the waterproof protective sheath 8 is advantageously a sheath composed of from two materials.
- the first material forms a coating 9 radially interior, while the second material forms a covering 10 radially exterior applying the first coating 9 against the anode 3, so as to ensure sealing.
- the first radially inner material has a melting temperature lower than that of the radially outer material: thus, during heating the sheath 8 to an intermediate temperature between the temperatures of fusion of the two materials, the first interior material melts and is applied against the anode 3 by the retraction of the second material.
- the sheath thus formed is waterproof and encloses the anode 3 so as to avoid any slipping during the subsequent fitting through the insulating element 2.
- the first material constituting the coating 9 is a fluorinated thermoplastic material
- the second material is a polymer heat-shrinkable fluoride, for example polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the waterproof protective sheath 8 is interrupted over a length 1 for allow clamping and holding of the anode 3 by the insulating support element 2 and avoid the expulsion of the sheathed anode through the insulating element 2 during the rise in tank pressure.
- the order of operations is as follows: we prepare everything first anode 3 and we apply the sheath made of two materials that we heats to ensure proper application of the sheath 8 on the anode 3 providing water tightness, even under pressure at the interface between anode 3 and the coating 9; then the sheathed anode is mounted in the connector or support of connection 4 with its insulated conductor 5.
- the assembly carried out by forming the sheath, assembly to connector 4 and fitting of this assembly through the cap 2 is shown in a position prior to threading this assembly on the thermowell tube 1 by pushing in the direction of the arrow 11.
- the tank can then be filled with water and is likely to increase in pressure when heating the water, since the seal will be automatically obtained by the external pressure exerted on the insulating cap 2. Indeed, this increase in pressure produces a contraction of the cap 2 by tightening the tube 1 and a contraction of the clamping part extending over a length 1 corresponding to the interruption of the sealed sheath 8. This contraction around the anode 3 prevents any expulsion of the sheathed anode through the fitting hole.
- the invention thus makes it possible to avoid electrolytic oxidation of the cap. resilient 2, while ensuring pressure retention and tightness identical to that of the prior art.
- the nature of the material or materials used to constitute the sheath 8 surrounding the metal anode 3 does not constitute an obstacle to the good sealing of the device, due to the preservation of a clamping length 1 ensuring direct contact of the anode metal and resilient cap material 2.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
- Cable Accessories (AREA)
- Control Of Resistance Heating (AREA)
- Discharge Heating (AREA)
- Furnace Details (AREA)
Description
- ladite gaine étanche de protection enserre l'anode extérieurement à l'élément isolant et sur une partie de la longueur d'emmanchement de l'anode à l'intérieur de l'élément isolant,
- ladite gaine étanche de protection est une gaine composée à partir de deux matériaux, le premier matériau radialement intérieur présentant une température de fusion inférieure à celle du deuxième matériau radialement intérieur,, de manière à assurer un contact étroit de l'anode et du premier matériau par fusion du premier matériau et application du premier matériau fondu contre l'anode par thermorétraction du deuxième matériau,
- le premier matériau est un matériau thermoplastique fluoré,
- le deuxième matériau est un polymère fluoré thermorétractable,
- la gaine étanche de protection est interrompue pour permettre un serrage et un maintien de l'anode par l'élément isolant et éviter l'expulsion de l'anode à travers l'élément isolant lors de la montée en pression de la cuve,
- l'anode est une anode en titane ou en titane revêtu extérieurement d'un oxyde métallique ou tout autre matériau passivable,
- la gaine étanche de protection est appliquée sur l'anode avant emmanchement de l'anode gainée à travers l'élément isolant,
- ranode gainée est montée dans un support de connexion avant emmanchement de l'anode jusqu'à une position de butée dudit support de connexion sur l'élément isolant,
- le montage comportant l'anode gainée emmanchée dans l'élément isolant jusqu'à une position de butée est ensuite enfilé sur le doigt de gant.
- la figure 1 représente schématiquement une vue partielle en section diamétrale d'un dispositif de l'art antérieur,
- la figure 2 représente schématiquement une vue agrandie analogue à la figure 1 illustrant le phénomène d'oxydation électrolytique,
- la figure 3 représente schématiquement un assemblage d'anodes pour dispositif selon l'invention,
- la figure 4 représente schématiquement une vue en section diamétrale d'un dispositif selon l'invention.
Claims (10)
- Dispositif de protection cathodique de cuve de chauffe-eau, du type comportant un doigt de gant (1) portant à son extrémité un élément isolant (2) de support d'une anode (3) non consommable, caractérisé en ce qu'une gaine étanche (8) de protection est placée entre l'anode (3) et l'élément isolant (2) à l'intérieur de la cuve, de manière à éviter la dégradation de l'élément isolant (2) par oxydation électrolytique de l'eau de la cuve.
- Dispositif selon la revendication 1, caractérisé en ce que ladite gaine étanche (8) de protection enserre l'anode (3) extérieurement à l'élément isolant (2) et sur une partie de la longueur d'emmanchement de l'anode (3) à l'intérieur de l'élément isolant (2).
- Dispositif selon la revendication 1 ou la revendication 2, caractérisé en ce que ladite gaine étanche (8) de protection est une gaine composée à partir de deux matériaux, le premier matériau radialement intérieur (9) présentant une température de fusion inférieure à celle du deuxième matériau radialement extérieur (10), de manière à assurer un contact étroit de l'anode (3) et du premier matériau (9) par fusion du premier matériau (9) et application du premier matériau (9) fondu contre l'anode par thermorétraction du deuxième matériau (10).
- Dispositif selon la revendication 3, caractérisé en ce que le premier matériau (9) est un matériau thermoplastique fluoré.
- Dispositif selon la revendication 3 ou la revendication 4,, caractérisé en ce que le deuxième matériau (10) est un polymère fluoré thermorétractable.
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la gaine étanche (8) de protection est interrompue pour permettre un serrage et un maintien de l'anode (3) par l'élément isolant (2) et éviter l'expulsion de l'anode (3) à travers l'élément isolant (2)lors de la montée en pression de la cuve
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'anode (3) est une anode en titane ou en titane revêtu extérieurement d'un oxyde métallique ou tout autre matériau passivable.
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la gaine étanche (8) de protection est appliquée sur l'anode (3) avant emmanchement de l'anode (3) gainée à travers l'élément isolant (2).
- Dispositif selon la revendication 8, caractérisé en ce que l'anode (3) gainée (8) est montée dans un support (4) de connexion avant emmanchement de l'anode jusqu'à une position de butée dudit support de connexion (4) sur l'élément isolant (2).
- Dispositif selon la revendication 9, caractérisé en ce que le montage comportant l'anode (3) gainée (8) emmanchée dans l'élément isolant (2) jusqu'à une position de butée est ensuite enfilé sur le doigt de gant (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9930212T SI0952240T1 (en) | 1998-04-20 | 1999-03-03 | Device for the cathodic protection of a water heater |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9804904 | 1998-04-20 | ||
FR9804904A FR2777573B1 (fr) | 1998-04-20 | 1998-04-20 | Dispositif de protection cathodique de cuve de chauffe-eau |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0952240A1 EP0952240A1 (fr) | 1999-10-27 |
EP0952240B1 true EP0952240B1 (fr) | 2002-11-27 |
Family
ID=9525431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99400509A Expired - Lifetime EP0952240B1 (fr) | 1998-04-20 | 1999-03-03 | Dispositif de protection cathodique de cuve de chauffe-eau |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0952240B1 (fr) |
AT (1) | ATE228583T1 (fr) |
DE (1) | DE69904103T2 (fr) |
ES (1) | ES2188100T3 (fr) |
FR (1) | FR2777573B1 (fr) |
SI (1) | SI0952240T1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103436890A (zh) * | 2013-08-16 | 2013-12-11 | 钱伟 | 一种电子阳极棒 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102127769A (zh) * | 2011-02-16 | 2011-07-20 | 齐文东 | 船用舷外冷却井用外加电流阴极保护装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61592A (ja) * | 1984-06-12 | 1986-01-06 | Matsushita Electric Ind Co Ltd | カソ−ド防食用アノ−ド電極 |
JPH01162785A (ja) * | 1987-12-17 | 1989-06-27 | Sanyo Electric Co Ltd | 防蝕用電極 |
GB9520588D0 (en) * | 1995-10-09 | 1995-12-13 | Raychem Sa Nv | Corrosion protection and electrical grounding |
FR2740784B1 (fr) * | 1995-11-02 | 1998-01-02 | Atlantic Soc Fr Dev Thermique | Dispositif de protection cathodique de cuve de chauffe-eau et chauffe-eau equipe d'un tel dispositif |
-
1998
- 1998-04-20 FR FR9804904A patent/FR2777573B1/fr not_active Expired - Fee Related
-
1999
- 1999-03-03 EP EP99400509A patent/EP0952240B1/fr not_active Expired - Lifetime
- 1999-03-03 AT AT99400509T patent/ATE228583T1/de not_active IP Right Cessation
- 1999-03-03 ES ES99400509T patent/ES2188100T3/es not_active Expired - Lifetime
- 1999-03-03 DE DE69904103T patent/DE69904103T2/de not_active Expired - Lifetime
- 1999-03-03 SI SI9930212T patent/SI0952240T1/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103436890A (zh) * | 2013-08-16 | 2013-12-11 | 钱伟 | 一种电子阳极棒 |
Also Published As
Publication number | Publication date |
---|---|
DE69904103D1 (de) | 2003-01-09 |
ES2188100T3 (es) | 2003-06-16 |
FR2777573A1 (fr) | 1999-10-22 |
FR2777573B1 (fr) | 2000-06-23 |
EP0952240A1 (fr) | 1999-10-27 |
ATE228583T1 (de) | 2002-12-15 |
DE69904103T2 (de) | 2003-08-21 |
SI0952240T1 (en) | 2003-06-30 |
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