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WO2020065390A1 - Moyen de fixation isolant pour anode de magnésium de chauffe-eau électrique - Google Patents

Moyen de fixation isolant pour anode de magnésium de chauffe-eau électrique Download PDF

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Publication number
WO2020065390A1
WO2020065390A1 PCT/IB2019/000754 IB2019000754W WO2020065390A1 WO 2020065390 A1 WO2020065390 A1 WO 2020065390A1 IB 2019000754 W IB2019000754 W IB 2019000754W WO 2020065390 A1 WO2020065390 A1 WO 2020065390A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating assembly
flange
assembly according
plastic material
anode
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.)
Ceased
Application number
PCT/IB2019/000754
Other languages
English (en)
Inventor
Stefano Ferroni
Renato Moreci
Eros ROMAGNOLI
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.)
Merloni Termosanitari SpA
Ariston SpA
Original Assignee
Merloni Termosanitari SpA
Ariston Thermo SpA
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 Merloni Termosanitari SpA, Ariston Thermo SpA filed Critical Merloni Termosanitari SpA
Priority to ES202190019A priority Critical patent/ES2874153B2/es
Publication of WO2020065390A1 publication Critical patent/WO2020065390A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/142—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using electric energy supply
    • 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
    • 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
    • C23F13/20—Conducting electric current to electrodes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
    • F24H1/202—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply with resistances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/40—Arrangements for preventing corrosion
    • F24H9/45—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/40—Arrangements for preventing corrosion
    • F24H9/45—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means
    • F24H9/455—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means for water heaters

Definitions

  • the object of the present invention is a heating assembly for an electric water heater, comprising insulating fixing means for an anode intended to provide corrosion protection to the metal tank of said electric water heater.
  • the invention falls within the field of electric storage water heaters, for which a significant problem is constituted by the corrosion to which the internal surface of the storage tank is subjected: for this purpose it has long been known to provide a cathodic protection device, represented by a passive sacrificial anode to counteract such corrosion process deriving from the exchange of ions between water and metal alloy of the tank.
  • a cathodic protection device represented by a passive sacrificial anode to counteract such corrosion process deriving from the exchange of ions between water and metal alloy of the tank.
  • the sacrificial passive anode (hereinafter abbreviated as "anode”) is typically made of magnesium (or alloy thereof) with electrochemical potential significantly lower than that of the walls of the steel tank, which thus act as a cathode.
  • Such anode generally finds support on the same flange of the tank that supports other functional elements of the water heater: the structure and arrangement of such group of elements are widely known to the person skilled in the art, but the main features thereof are briefly described hereinafter for the purpose of making the present invention and its scope of application clearer.
  • the heating element represented by one or more electrical resistances, suitable for the immersion in water for the heating of the storage,
  • thermo-regulation and/or thermo-protection thermostat equipped with one or more temperature sensors
  • heating assembly shall mean the entire assembly of the elements listed above, suitable for the heating and protection.
  • heating elements made of a nobler metal material having higher features of resistance to corrosion and greater electrochemical potential than that of the materials of the heating elements commonly used in electric water heaters may be provided.
  • the object of the present invention is to obviate such kind of drawbacks by providing a heating assembly having special means for insulating the anode from the heating element, so that the anti-corrosive properties of said anode are correctly directed to the tank of the storage water heater.
  • a further object is to indicate means suitable for the fixing said anode on the heating assembly, without impairing neither the mechanical seal nor the hydraulic seal of the elements supported by said heating assembly.
  • FIG. 1 shows an exploded view of the heating assembly according to the invention
  • FIG. 1 depicts the heating assembly of Fig. 1 , according to a side section view;
  • FIG. 2.B is an enlargement of Fig. 2.A, in order to show a detail of the heating assembly according to the invention
  • A illustrates the insulating fitting of the heating assembly according to the invention
  • FIG. 3.B shows a section of the insulating fitting of the heating assembly according to the invention.
  • FIG 1 shows the whole heating assembly according to the invention, depicted with its components disassembled for clarity of description.
  • said heating assembly comprises:
  • flange FA preferably of galvanized steel, suitable for acting as a closing element of the hole made in the tank S and for supporting all the remaining components
  • said flange FA is defined as a "closing flange FA”
  • a flange FO preferably of brass, located above said closing flange FA and electrically insulated therefrom by means of an annular dielectric gasket GD, also intended to avoid any water leakage towards the exterior of the tank S
  • said flange FO is defined as a "support flange FO"
  • At least one heating element R represented by a standard electric resistance, the lower ends thereof are located in special collars C obtained on said support flange FO;
  • the lower end GA thereof (hereinafter referred to as "stem GA") is supported by said support flange FO through the insulating fitting 1, object of the present invention.
  • Reference V indicates a joining screw suitable for the assembly of the entire heating assembly, i.e. for fixing the steel closing flange FA to the overlying support flange FO, with the interposition of an insulating bush (indicated by reference B) of plastic material for the reciprocal electric insulation between said two flanges FA, FO.
  • the support flange FO (whereon the heating element R, the thermostat sheath G and the anode A are mounted) is preferably made of brass, a material that has proved to be suitable, thanks to its malleability and workability characteristics, for allowing the constraint of the ends of said heating element R and sheath G in the collars C, by braze welding with deposition of a tin soldering alloy or through the use of an adhesive resin (for example a single-component epoxy resin to be subjected to a catalyst step for the necessary hardening).
  • an adhesive resin for example a single-component epoxy resin to be subjected to a catalyst step for the necessary hardening
  • the heating element R is preferably made of titanium or alloys thereof, while the anode A is preferably made of magnesium or alloys thereof; as anticipated, it is necessary that such two components are electrically insulated, otherwise said anode A would act as an anti-corrosion device for the heating element R instead of for the tank S of the water heater: the object is achieved thanks to the insulating fitting 1 , shortly described in detail, with which this anode A is dielectrically fixed on the support flange FO.
  • Fig. 2.A and in the enlargement of Fig. 2.B the heating assembly described above is shown, with its assembled elements, including said insulating fitting 1 acting as a dielectric connector for the anode A with respect to the support flange FO.
  • insulating fitting 1 comprising an outer part 2 of plastic material and an insert 3 of metal material, partially inserted in said outer part 2.
  • said outer part 2 is preferably made of polyphenylene sulphide (PPS), for example fortron®, a polymer with high thermal performance, capable of withstanding temperatures in the order of 300 °C.
  • PPS polyphenylene sulphide
  • such outer part 2 made of plastic material incorporates part of the metal insert 3, preferably brass.
  • said insulating fitting 1 therefore comprises:
  • summit portion represented by the upper end 3.2 of the metal insert 3 that projects from the plastic part 2; said summit portion comprises a cavity 3.1 that acts as a seat for the insertion of the stem GA of the anode A;
  • stem 3.3 a pedical portion represented by the lower end 3.3 (hereinafter "stem 3.3") of said metal insert 3, projecting from the threaded lower section 2.2 of said outer plastic part 2.
  • OR is obtained between the upper section 2.1 and the lower section 2.2 of said outer plastic part 2, in order to seat an annular gasket OR, for example of the O-ring type: said O-ring OR acts as a hydraulic seal against the support flange FO whereon such insulating fitting 1 is screwed.
  • Fig. 2.B The detail of Fig. 2.B is useful to clarify the dielectric function of the insulating fitting 1.
  • the anode A is therefore completely electrically insulated from said support flange FO (and, consequently, from the heating element R fixed to such flange FO), since the contact of the insulating fitting 1 with such support flange FO occurs only through the threaded lower section 2.2 of the plastic outer part 2 thereof.
  • Said anode A is electrically in contact with the underlying closing flange FA (and, therefore, with the tank S whereon said flange FA is screwed and towards which such anode A has the task of carrying out its protection properties against corrosion) through the stem 3.3 of the metal insert 3, which extends up to said closing flange FA and whereon it is constrained and placed in contact by means of a metal nut V2 and washer V 1 , respectively.
  • the electrical insulation between the two flanges FA, FO is safeguarded both by the annular dielectric gasket GD and by the insulating bush B of plastic material, interposed to the joining screw V of the entire heating assembly.
  • the upper section 2.1 of the outer plastic part 2 is made in the form of a hexagonal nut, so as to facilitate screwing with standard tools on the support flange FO by the lower threaded section 2.2: however it is also possible that said upper section 2.1 is shaped differently, like the lower section 2.1 that may be without the threading, being also able to be constrained to said support flange FO by different means and methods.
  • the heating element R is made of titanium (or alloys thereof) while the anode A is made of magnesium (or alloys thereof): however the use of different metal materials, with chemical characteristics that give rise to electrochemical phenomena similar to those carried out by titanium and magnesium may be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Resistance Heating (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

La présente invention concerne un ensemble de chauffage d'un chauffe-eau électrique, l'ensemble comprenant un raccord fileté isolant (1) pour une anode sacrificielle (A), convenant à la protection contre la corrosion du réservoir (S) dudit chauffe-eau électrique. Ledit raccord fileté isolant (1) comprend une partie externe (2) en plastique et un insert (3) en métal introduit partiellement dans ladite partie externe (2). Le raccord fileté isolant (1) est fabriqué de préférence par co-moulage et a pour fonction d'isoler électriquement ladite anode (A) de la bride de support (FO) sur laquelle elle est fixée, et de la mettre en contact électrique avec la bride de fermeture (FA) dudit réservoir (S).
PCT/IB2019/000754 2018-09-28 2019-09-11 Moyen de fixation isolant pour anode de magnésium de chauffe-eau électrique Ceased WO2020065390A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES202190019A ES2874153B2 (es) 2018-09-28 2019-09-11 Medio de fijación aislante para un ánodo de magnesio de un calentador de agua eléctrico

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000009038 2018-09-28
IT201800009038 2018-09-28

Publications (1)

Publication Number Publication Date
WO2020065390A1 true WO2020065390A1 (fr) 2020-04-02

Family

ID=64744846

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/000754 Ceased WO2020065390A1 (fr) 2018-09-28 2019-09-11 Moyen de fixation isolant pour anode de magnésium de chauffe-eau électrique

Country Status (2)

Country Link
ES (1) ES2874153B2 (fr)
WO (1) WO2020065390A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2002976A6 (es) * 1986-03-03 1988-10-01 Shapira Avraham Calentador electrico de agua con una disposicion de caldeo rapido
EP1431420A1 (fr) * 2002-12-19 2004-06-23 A.Georgios Tsagadas Sonde pour détecter la détoriation des anodes sacrificielles utilisées pour la protection contre l'érosion
WO2007010335A2 (fr) * 2005-07-20 2007-01-25 Merloni Termosanitari S.P.A. Chauffe-eau a accumulation a protection cathodique reglable

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975560A (en) * 1989-09-06 1990-12-04 A.O. Smith Corporation Apparatus for powering the corrosion protection system in an electric water heater
ITAN20020057A1 (it) * 2002-11-27 2004-05-28 Merloni Termosanitari Spa Ora Ariston Thermo Spa Dispositivo a correnti impresse sensibile ai
CN203320128U (zh) * 2013-05-14 2013-12-04 青岛经济技术开发区海尔热水器有限公司 一种阳极棒消耗检测提示装置及热水器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2002976A6 (es) * 1986-03-03 1988-10-01 Shapira Avraham Calentador electrico de agua con una disposicion de caldeo rapido
EP1431420A1 (fr) * 2002-12-19 2004-06-23 A.Georgios Tsagadas Sonde pour détecter la détoriation des anodes sacrificielles utilisées pour la protection contre l'érosion
WO2007010335A2 (fr) * 2005-07-20 2007-01-25 Merloni Termosanitari S.P.A. Chauffe-eau a accumulation a protection cathodique reglable

Also Published As

Publication number Publication date
ES2874153R1 (es) 2021-11-05
ES2874153B2 (es) 2023-12-13
ES2874153A2 (es) 2021-11-04

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