EP0755172A2 - Elément métallique, en particulier un corps de chauffe électrique, pour un composant métallique conduisant de l'eau d'une installation de chauffage d'eau - Google Patents

Elément métallique, en particulier un corps de chauffe électrique, pour un composant métallique conduisant de l'eau d'une installation de chauffage d'eau Download PDF

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Publication number
EP0755172A2
EP0755172A2 EP96890120A EP96890120A EP0755172A2 EP 0755172 A2 EP0755172 A2 EP 0755172A2 EP 96890120 A EP96890120 A EP 96890120A EP 96890120 A EP96890120 A EP 96890120A EP 0755172 A2 EP0755172 A2 EP 0755172A2
Authority
EP
European Patent Office
Prior art keywords
water
metallic
metal
coating
built
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Withdrawn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
EP96890120A
Other languages
German (de)
English (en)
Other versions
EP0755172A3 (fr
Inventor
Gerhard Glanz
Rudolf Holly
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0755172A2 publication Critical patent/EP0755172A2/fr
Publication of EP0755172A3 publication Critical patent/EP0755172A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor

Definitions

  • the invention relates to a metallic built-in part, in particular an electric radiator, for a water-carrying metal component, in particular a steel tank, a water heating system, preferably a domestic hot water boiler, provided with a protective layer against corrosion, for example enamelling, the metallic built-in part having a higher potential for the electrochemical series than the metal component owns.
  • Service water boilers made of steel are provided on the inside with a protective layer against corrosion, which must be free of physiologically questionable substances and resistant to acid.
  • this protective layer consists of enamelling, but other materials, for example plastic, can also be used.
  • the protective layer always has imperfections, for example pores, bubbles or the like, which do not adequately protect the steel.
  • the water which is always provided with admixtures and therefore forms an electrolyte solution, now causes corrosion of the steel container in the area of these defects by means of an electrochemical reaction, namely anodic dissolution of the steel and cathodic electron absorption by means of the electrolyte.
  • This consists in arranging a so-called sacrificial anode inside the steel container, which is conductively connected to the steel container and which either consists of a material that has a lower potential in the electrochemical series than the steel, for example a magnesium alloy, or that is generated by external current is fed accordingly.
  • This sacrificial electrode forms the negative pole of a natural electrolytic cell in which a current flows to the steel container to be protected, thereby preventing its corrosion. The sacrificial electrode gradually wears off when the protective current is released and must then be replaced.
  • a two-part installation body for example a flange, nipple or the like, one part being fastened to the metal installation part and the other part for installation in the metal container, in particular service water boiler, for example by means of a threaded flange.
  • An electrically insulating intermediate piece for example a washer, a seal or a plastic turned part, is arranged between the two parts of this installation body, by means of which electrical insulation is brought about between the metal installation part and the metal container.
  • a further possibility of providing such electrical insulation between the metal container and the metallic installation part is then to cast the metal installation part in the region of the fastening with the metal container into a plastic part which is provided, for example, with a fastening flange for fastening to the metal container.
  • the object of the present invention is to avoid the disadvantages mentioned and to provide a metallic built-in part, in particular an electric radiator of the type described at the outset, which can be installed in a water-bearing metal part without additional measures, even if it has a cathodic corrosion protection, with a sacrificial anode.
  • the invention proposes that the metallic built-in part is provided with an electrically insulating protective layer on its outside coming into contact with the water. This insulating protective layer largely prevents the flow of currents in the water forming an electrolytic solution and ensures that the Cathodic corrosion protection is not significantly disturbed by attaching the metallic installation part in the metal component.
  • this metal built-in part Due to the completely electrically insulating protective layer covering the metal built-in part on the outside, this metal built-in part becomes potential-free and thus has no influence on the electrolytic currents in the water forming an electrolytic solution, which is located in the metal container, so that the cathodic corrosion protection continues to be effective .
  • this coating of the metallic installation part can also be provided with imperfections.
  • the metallic installation part can, for example, be provided on the outside with a coating, in particular with a dip coating, which forms the electrically insulating protective layer, but it can also be provided with a coating, for example a plastic coating, which e.g. is applied electrostatically.
  • the metallic built-in part designed according to the invention is suitable not only for arrangement in metal containers, for example in service water boilers made of steel, but also in metal pipes through which water flows, in which the service water is heated in a continuous process. Other areas of application for hot water heating are also possible.
  • This metallic built-in part consists of a housing 1, in which electrical control devices, in particular also a thermostat that can be set by means of a rotary knob 2, for regulating the hot water temperature, are provided.
  • the power supply takes place via a connecting line 3.
  • the housing 1 has a connection piece 4 with a screw thread, via which the electric heater can be screwed into a corresponding hole or sleeve in the steel wall of a domestic hot water boiler.
  • the inside of the hot water boiler is provided with a protective layer against corrosion, for example enamelling, and inside the hot water boiler there is cathodic corrosion protection in the form of a sacrificial anode.
  • Heater rods 5 and a metallic protective tube 7 for the temperature sensor of the electrical control devices project into the interior of the housing 1 Hot water boiler.
  • the heating rods 5 consist of several metal tubes, which have the current-carrying heating coils in their interior.
  • the outside 6 of the heating rods 5 and the protective tube 7 are provided with an electrically insulating coating which, for example, consists of a coating, in particular a dip coating, or a powder coating or the like. consists.

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  • Prevention Of Electric Corrosion (AREA)
EP96890120A 1995-07-20 1996-07-10 Elément métallique, en particulier un corps de chauffe électrique, pour un composant métallique conduisant de l'eau d'une installation de chauffage d'eau Withdrawn EP0755172A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1241/95 1995-07-20
AT124195 1995-07-20

Publications (2)

Publication Number Publication Date
EP0755172A2 true EP0755172A2 (fr) 1997-01-22
EP0755172A3 EP0755172A3 (fr) 1997-08-27

Family

ID=3509662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96890120A Withdrawn EP0755172A3 (fr) 1995-07-20 1996-07-10 Elément métallique, en particulier un corps de chauffe électrique, pour un composant métallique conduisant de l'eau d'une installation de chauffage d'eau

Country Status (1)

Country Link
EP (1) EP0755172A3 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905001A1 (de) * 1969-02-01 1970-08-06 Friedemann Poepel Heizwendel zum Anwaermen von Fluessigkeit
DE2605089A1 (de) * 1976-02-10 1977-09-08 Westfael Elekt Werke Wasserbehaelter mit elektrischem heizelement und kathodischem korrosionsschutz
DE3506606A1 (de) * 1984-03-21 1986-08-28 Erwin Dipl.-Ing. 6336 Solms Groß Elektroheizkoerper mit isolierter durchfuehrung in warmwasserspeichern
US5013890A (en) * 1989-07-24 1991-05-07 Emerson Electric Co. Immersion heater and method of manufacture
GB2244898A (en) * 1990-06-05 1991-12-11 David William Townsend Scale inhibiting plastics coating of immersion heater or heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905001A1 (de) * 1969-02-01 1970-08-06 Friedemann Poepel Heizwendel zum Anwaermen von Fluessigkeit
DE2605089A1 (de) * 1976-02-10 1977-09-08 Westfael Elekt Werke Wasserbehaelter mit elektrischem heizelement und kathodischem korrosionsschutz
DE3506606A1 (de) * 1984-03-21 1986-08-28 Erwin Dipl.-Ing. 6336 Solms Groß Elektroheizkoerper mit isolierter durchfuehrung in warmwasserspeichern
US5013890A (en) * 1989-07-24 1991-05-07 Emerson Electric Co. Immersion heater and method of manufacture
GB2244898A (en) * 1990-06-05 1991-12-11 David William Townsend Scale inhibiting plastics coating of immersion heater or heat exchanger

Also Published As

Publication number Publication date
EP0755172A3 (fr) 1997-08-27

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