EP0533097A2 - Procédé d'imprégnation d'un échangeur de chaleur - Google Patents

Procédé d'imprégnation d'un échangeur de chaleur Download PDF

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Publication number
EP0533097A2
EP0533097A2 EP92115722A EP92115722A EP0533097A2 EP 0533097 A2 EP0533097 A2 EP 0533097A2 EP 92115722 A EP92115722 A EP 92115722A EP 92115722 A EP92115722 A EP 92115722A EP 0533097 A2 EP0533097 A2 EP 0533097A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
resin
cavities
gaps
fins
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.)
Granted
Application number
EP92115722A
Other languages
German (de)
English (en)
Other versions
EP0533097A3 (en
EP0533097B1 (fr
Inventor
Rolf Schmitz
Uwe Schürbrock
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
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 Vaillant Austria GmbH, Vaillant NV, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd filed Critical Vaillant Austria GmbH
Publication of EP0533097A2 publication Critical patent/EP0533097A2/fr
Publication of EP0533097A3 publication Critical patent/EP0533097A3/de
Application granted granted Critical
Publication of EP0533097B1 publication Critical patent/EP0533097B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish

Definitions

  • the invention relates to a method for coating areas at risk of corrosion, such as cavities and gaps, of a finned heat exchanger with a thermally and chemically resistant resin and to a method for producing a heat exchanger suitable for coating.
  • Heat exchangers in heating devices are wanted as a result of certain operating conditions, in particular in the case of condensing devices, or are more or less exposed to exhaust gas condensate unintentionally.
  • This condensate has a corrosive effect on metals.
  • there are different signs of corrosion that directly affect the service life of the heat exchanger, since they preferably occur in the area between the fins and the water-carrying pipes and can thus lead to leaks in the system.
  • Another aspect of condensing boilers is the enrichment of the exhaust gas condensate with metals and metal compounds material detachment processes occurring at the heat exchanger, some of which exceed the permissible limit values.
  • a heat exchanger has become known from EP-PS 184 612, in which the water-carrying pipes in the lamella area are continuously covered without a gap with a protective layer applied before the lamellas are attached.
  • EP-PS 184 612 there is still a risk of corrosion due to gaps and caverns between the fins or the fins and the heat exchanger tube.
  • gaps and caverns aggressive components of the flue gas can attack the heat exchanger tube in a concentrated manner, so that gap corrosion and pitting can also occur with stainless steel tubes or tubes coated according to the above-mentioned EP-PS.
  • impregnation processes are also known in which the part to be impregnated is inserted into an autoclave, which evacuated and flooded with an impregnating agent in the event of overpressure.
  • evacuation and impregnation are carried out at the same time, as a result of which a high depth of penetration of the impregnating agent into cavities can be achieved.
  • Capillary forces which act in particular in tubular cavities, as described in US Pat. No. 4,453,301, can also be used for this purpose.
  • these known methods cannot easily be transferred to the special problems associated with heat exchangers. It is important that not too much and not too little resin is applied to the areas that are really at risk of corrosion.
  • the object of the invention is to provide a coating method for heat exchangers which can be limited to the areas which are actually at risk of corrosion and which offers increased security against corrosion.
  • This vacuum impregnation process using the Maldaner method means that only the cavities and the gaps in the heat exchanger are filled with synthetic resin.
  • the heat exchanger can optionally first be cleaned at approximately 120 ° C. or alternatively washed alkaline and then dried in an oven at 120 ° C. This ensures that the gaps and cavities are free of grease and dry.
  • the Maldaner process requires a maximum vacuum pressure of 5 mbar. At this pressure, the impregnation resin easily penetrates all gaps and cavities. After the vacuum is released, the impregnation resin is pressed into the gaps and cavities by the atmospheric pressure and thus reaches even the finest branches. During the subsequent cleaning in a water bath, the entire heat exchanger is washed off in such a way that no surface film remains. Only the impregnation resin in the gaps and cavities can no longer be washed out due to capillary forces. Finally, the resin is cured in the polymerization bath at 90 ° C.
  • the expansion behavior of the resin is also advantageous. If the heat exchanger expands as a result of temperature stress, the resin forms a flexible seal between the fins, which prevents the formation of noise - cracking due to different thermal expansion - prevented.
  • the gap widths are between 0.002 mm and 0.2 mm and that the temperature in the area of the resin does not exceed 250 ° C.
  • the very wide tolerance range with regard to the gap widths can already be taken into account when manufacturing the heat exchanger base body.
  • the fins are preferably fixed to the heat exchanger tubes in such a way, in particular soldered on or pressed or shrunk onto the stainless steel heat exchanger tubes that the clear widths of the gaps and cavities between 0.002 and 0.2 mm.
  • Slats with a U-shaped foot part L-shaped slats or hockey stick-shaped slats are preferably used.
  • lamellae 1 which are bent in a U-shape are provided in the foot region and are connected to a heat exchanger tube 3 via a solder foil 2. Adjacent slats lie against each other with their U-legs, whereby column 4 is formed. The curvature in the foot region also creates cavities 5 between the fastening points of the fins 1 on the heat exchanger tube 3.
  • the impregnation resin remains only in the columns 4 and cavities 5 of the heat exchanger.
  • the excess resin is completely removed by the washing-out process, but not the resin held in the columns 4 and cavities 5 by capillary forces.
  • the same method can also be used in the heat exchangers according to FIGS. 2 to 4.
  • the lamellae are L-shaped and, with the short legs 6 forming the lamella feet, each abut the long legs 7 of adjacent lamellae 1 '.
  • FIG. 3 likewise shows L-shaped fins 1 ', these fins 1' not being soldered to the heat exchanger tube 3, but rather being pressed or shrunk onto a heat exchanger tube 3 ', preferably made of stainless steel.
  • a heat exchanger constructed according to FIG. 4 is also suitable for using the vacuum impregnation method described above.
  • This heat exchanger has fins 1 '' in the form of a hockey stick, which are arranged stacked one on top of the other in the foot region 8 and are only soldered to the heat exchanger tube 3 in the region of the tips 9.
  • the invention is not limited to the exemplary embodiments specified above; rather, a number of variants are conceivable which make use of the invention even with a fundamentally different structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Glass Compositions (AREA)
  • Saccharide Compounds (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Reinforced Plastic Materials (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Laminated Bodies (AREA)
EP92115722A 1991-09-19 1992-09-14 Procédé d'imprégnation d'un échangeur de chaleur Expired - Lifetime EP0533097B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1881/91 1991-09-19
AT0188191A AT400012B (de) 1991-09-19 1991-09-19 Imprägnierverfahren

Publications (3)

Publication Number Publication Date
EP0533097A2 true EP0533097A2 (fr) 1993-03-24
EP0533097A3 EP0533097A3 (en) 1993-06-16
EP0533097B1 EP0533097B1 (fr) 1996-07-17

Family

ID=3523040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115722A Expired - Lifetime EP0533097B1 (fr) 1991-09-19 1992-09-14 Procédé d'imprégnation d'un échangeur de chaleur

Country Status (3)

Country Link
EP (1) EP0533097B1 (fr)
AT (2) AT400012B (fr)
DE (2) DE4230705A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6705391B1 (en) * 2001-10-19 2004-03-16 Scott Jay Lewin Heat exchanger
CN109813171A (zh) * 2017-11-20 2019-05-28 马日专业涂层私人有限公司 翅片管型热交换器及其制造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1075574A (en) * 1964-04-24 1967-07-12 English Electric Co Ltd Heat exchangers
FR2060217A1 (en) * 1969-09-16 1971-06-18 Mac Elroy Arthur Helically wound, finned tubes used for heat - exchangers
US4453301A (en) * 1980-11-17 1984-06-12 United Aircraft Products, Inc. Sealing mechanical tube joints
DE3423483C1 (de) * 1984-06-26 1985-09-19 K.I.D. Imprägnier- und Polymertechnik GmbH, 8018 Grafing Verfahren und Vorrichtung zum Imprägnieren hohler Bauteile
DE3522036A1 (de) * 1984-09-18 1986-03-20 Robert Bosch Gmbh, 7000 Stuttgart Waermeuebertrager, insbesondere fuer gas- oder oelbeheizte wassererhitzer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6705391B1 (en) * 2001-10-19 2004-03-16 Scott Jay Lewin Heat exchanger
CN109813171A (zh) * 2017-11-20 2019-05-28 马日专业涂层私人有限公司 翅片管型热交换器及其制造方法

Also Published As

Publication number Publication date
ATE140530T1 (de) 1996-08-15
EP0533097A3 (en) 1993-06-16
AT400012B (de) 1995-09-25
EP0533097B1 (fr) 1996-07-17
DE59206777D1 (de) 1996-08-22
ATA188191A (de) 1995-01-15
DE4230705A1 (de) 1993-03-25

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