EP0640697B1 - Réservoir d'eau et procédé pour sa fabrication - Google Patents

Réservoir d'eau et procédé pour sa fabrication Download PDF

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Publication number
EP0640697B1
EP0640697B1 EP94108272A EP94108272A EP0640697B1 EP 0640697 B1 EP0640697 B1 EP 0640697B1 EP 94108272 A EP94108272 A EP 94108272A EP 94108272 A EP94108272 A EP 94108272A EP 0640697 B1 EP0640697 B1 EP 0640697B1
Authority
EP
European Patent Office
Prior art keywords
chloride
welding
wetted
sulphate
storage vessel
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
EP94108272A
Other languages
German (de)
English (en)
Other versions
EP0640697A1 (fr
Inventor
Rudolf Marquardt
Walter Nitsche
Hans-Ulrich Wachholz
Andreas Preiss
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.)
Nv Vaillant Sa
VAILLANT B.V.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Vaillant NV
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Vaillant BV
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
Priority claimed from DE4319113A external-priority patent/DE4319113C1/de
Application filed by Vaillant Austria GmbH, Vaillant NV, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant BV filed Critical Vaillant Austria GmbH
Publication of EP0640697A1 publication Critical patent/EP0640697A1/fr
Application granted granted Critical
Publication of EP0640697B1 publication Critical patent/EP0640697B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F24H1/181—Construction of the tank
    • F24H1/183—Inner linings
    • 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D3/00—Chemical treatment of the metal surfaces prior to coating
    • 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C23D5/02—Coating with enamels or vitreous layers by wet methods

Definitions

  • the present invention relates to an internally enamelled steel water tank and to a method for its production according to the preambles of the independent claims.
  • the first step was to apply a second layer of enamel, in which the enamelling process was repeated after the first layer of enamel had been fired.
  • the need for protective current is then considerably lower, but the production costs of a storage device are greatly increased.
  • the present invention has for its object to reduce the defectiveness of the internal enamelling of such a storage container without significantly increasing its manufacturing costs.
  • the significantly low protective current requirement is significant for the quality of the enamel obtained compared to the prior art, with hardly increased manufacturing costs.
  • a hot water tank 31 has a storage housing 1, which is provided on its inside with insulation 2, within which the actual storage tank 3 is mounted.
  • the storage container consists of a hollow cylindrical jacket part 4, the upper end 5 and the lower end 6 of which are covered by a base 7 and a cover 8, respectively.
  • Bottom and lid are hemispherical structures and exist as well as the jacket part 4 made of unalloyed steel.
  • the end 9 of the cover 8 and the end 10 of the bottom 7 are welded to the ends 5 and 6 of the jacket 4.
  • the weld seam 18 forms a ring.
  • the jacket sheet also has a longitudinal weld 11. All these three weld seams 18 and 11 are located in the interior 32 of the container 3 and are no longer accessible after the entire container 3 has been welded together.
  • connecting pieces 14 and 15 can be provided for the passage of a heating element 33 into the interior 32 of the storage container 3, whereby either a water-filled pipe coil or an electric heating element is connected through these connecting pieces. Both alternatives serve for the external heating of the content of the water reservoir 3.
  • feet 17 are provided for placing the storage container on a floor.
  • recesses can be present, for example in the case of a store which is heated directly by a gas burner, for carrying out the immersion combustion chamber, for providing a cleaning opening, for inserting an anode, a temperature sensor and the like.
  • These recesses or pipe sockets are omitted for the sake of simplicity.
  • the storage container is manufactured as follows:
  • the jacket part 4 is made from a sheet metal strip cut to size, possibly after making any recesses, by bending to the jacket shape, and then the longitudinal weld 11 is welded.
  • the lid and base are deep drawn from sheet metal, the holes for any sockets are made, the sockets are welded in if necessary. Then coat and base or lid are degreased, and after degreasing they are freed of adhering layers and contaminants. Then they are roughened by blasting with metal grains.
  • an aqueous solution of 50 to 300 g of an alkali or alkaline earth metal sulfate or chloride for example magnesium sulfate (MgSO 4 ), Magnesium chloride (MgCl 2 ), sodium sulfate (Na 2 SO 4 ) or sodium chloride (NaCl) per liter of water or a slurry of zinc sulfide (ZnS), nickel oxide (NiO) or cobalt oxide (Co 3 O 4 ).
  • a concentration of 87 g of MgSO 4 per liter of water has proven to be particularly expedient.
  • the height of the wetted seam area is also important. It has been found that wetting only a few millimeters on both sides of the weld seam to be provided and wetting of an area of more than 4 cm on both sides of the seam area do not lead to so good results. If an area of 2.0 to 3 cm on both sides of each seam is wetted with this aqueous solution or aqueous slurry, this has an influence on the adhesive behavior of the enamel slip to be applied subsequently, which adheres particularly well in this area. The burning of the angry Email slip then happens as in the prior art.
  • the problem of the adhesion of the enamel layer also arises only in the case of weld seams or weld seam sides in the area of the interior 32, that is to say in the area of the reservoir which will no longer be accessible later. External weld spots can be easily cleaned by blasting again with other particles after welding. Accordingly, the two weld seams between cover and middle part and bottom and middle part in the inner region of the storage container 3 are particularly at risk. These areas are therefore wetted.
  • the area of the longitudinal weld seam 11 can also be cleaned of welding residues from the inner area by re-treatment by blasting with metal bodies.
  • FIG. 2 shows an enlarged part of the inside view of a weld seam, this weld seam 18 consisting of the actual weld seam area, delimited by the boundary line 19 and 20, the wetted layer on both sides of the weld seam 18 is designated by 21 and 23, its limits by 22 and 24. If you open a store treated in this way, you can see the boundary lines 22 and 23 through elevations on the inside.
  • alkali or alkaline earth metal sulfate or chloride preferably MgSO 4
  • Wetting with alkali or alkaline earth metal sulfate or chloride, preferably MgSO 4 has the additional advantage of no dangers during handling and storage for the personnel, it is also safe for the user of the storage under food law (DIN safety data sheet 52900). Disposal is also easy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (6)

  1. Réservoir d'un chauffe-eau à accumulation, émaillé intérieurement et qui comprend un corps à peu près cylindrique et un fond de forme adéquate ainsi qu'un couvercle, tous assemblés par soudure, caractérisé par le fait qu'avant la soudure, les zones de contact respectives sont mouillées d'un sulfate ou d'un chlorure alcalin ou alcalino-terreux, de préférence sulfate ou chlorure de sodium ou de magnésium.
  2. Réservoir d'un chauffe-eau à accumulation, émaillé intérieurement et qui comprend un corps à peu près cylindrique et un fond de forme adéquate ainsi qu'un couvercle, tous assemblés par soudure, caractérisé par le fait qu'avant la soudure, les zones de contact respectives sont mouillées de sulfure de zinc, oxyde de nickel ou oxyde de cobalt.
  3. Procédé pour la fabrication d'un réservoir de chauffe-eau à accumulation, émaillé intérieurement et qui comprend un corps à peu près cylindrique et un fond de forme adéquate ainsi qu'un couvercle, composants qui sont d'abord dégraissés et au besoin grenaillés, puis assemblés par soudure et ensuite enduits de bouillie d'émail qui est par la suite soumise à une cuisson, procédé caractérisé par le fait qu'avant la soudure, les zones de contact respectives sont mouillées d'une solution acqueuse d'un sulfate ou d'un chlorure alcalin ou alcalino-terreux, de préférence sulfate ou chlorure de sodium ou de magnésium, ou d'une solution acqueuse de sulfure de zinc, oxyde de nickel ou oxyde de cobalt.
  4. Procédé suivant la revendication 3, caractérisé par le fait que la concentration de la solution acqueuse se situe entre 50 et 300 g de sulfate de magnésium par litre d'eau.
  5. Procédé suivant la revendication 3, caractérisé par le fait que la marge de part et d'autre de la soudure a une largeur de 1 à 4 cm, de préférence de 2 à 3 cm .
  6. Procédé suivant l'une des revendications 3 à 5, caractérisé par le fait que le mouillage est fait sur la face intérieure du réservoir.
EP94108272A 1993-06-05 1994-05-28 Réservoir d'eau et procédé pour sa fabrication Expired - Lifetime EP0640697B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4319113A DE4319113C1 (de) 1993-06-05 1993-06-05 Innenemaillierter Wasserbehälter und Verfahren zu seiner Herstellung
DE4319113 1993-06-05
DE4415587 1994-04-28
DE4415587 1994-04-28

Publications (2)

Publication Number Publication Date
EP0640697A1 EP0640697A1 (fr) 1995-03-01
EP0640697B1 true EP0640697B1 (fr) 1997-08-13

Family

ID=25926621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94108272A Expired - Lifetime EP0640697B1 (fr) 1993-06-05 1994-05-28 Réservoir d'eau et procédé pour sa fabrication

Country Status (3)

Country Link
EP (1) EP0640697B1 (fr)
AT (1) ATE156869T1 (fr)
DE (1) DE59403711D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6161272A (en) * 1999-08-23 2000-12-19 Madison; Charles D. Liquid storage tank apparatus and method of forming same
EP3054235A1 (fr) * 2015-02-09 2016-08-10 Ariston Thermo S.p.A. Procédé de revêtement pour réservoirs métalliques avec échangeur de chaleur à bobine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101274A1 (de) * 1981-01-16 1982-09-02 Rekord Heizungs- u. Klimageräte Ruckelshausen GmbH u. Co KG, 6102 Pfungstadt Emaillierverfahren fuer geschlossene behaelter

Also Published As

Publication number Publication date
DE59403711D1 (de) 1997-09-18
ATE156869T1 (de) 1997-08-15
EP0640697A1 (fr) 1995-03-01

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