EP0933150A2 - Method for producing a heat exchanger for fuel fired water heaters - Google Patents

Method for producing a heat exchanger for fuel fired water heaters Download PDF

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Publication number
EP0933150A2
EP0933150A2 EP98122043A EP98122043A EP0933150A2 EP 0933150 A2 EP0933150 A2 EP 0933150A2 EP 98122043 A EP98122043 A EP 98122043A EP 98122043 A EP98122043 A EP 98122043A EP 0933150 A2 EP0933150 A2 EP 0933150A2
Authority
EP
European Patent Office
Prior art keywords
lamella
tube
pipes
heat exchanger
slats
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
EP98122043A
Other languages
German (de)
French (fr)
Other versions
EP0933150A3 (en
Inventor
Heinz Ehrle
Dieter Krauss
Josef Reitstaetter
Manfred Seebauer
Gottfried Zoller
Hans-Ulrich Lenckner
Uwe Lindemann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0933150A2 publication Critical patent/EP0933150A2/en
Publication of EP0933150A3 publication Critical patent/EP0933150A3/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/24—Making finned or ribbed tubes by fixing strip or like material to tubes annularly-ribbed tubes
    • 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
    • F28F1/24—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 and extending transversely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/12—Fastening; Joining by methods involving deformation of the elements
    • F28F2275/125—Fastening; Joining by methods involving deformation of the elements by bringing elements together and expanding

Definitions

  • the invention is based on a method of manufacture a heat exchanger according to the preamble of the main claim.
  • the fins with the water pipes are soldered, taking it to minimize the soldering gap is also known, the tubes after joining of the slats by sliding one rotating driven tool to expand.
  • the solder joint ensures perfect heat transfer from the slats on the pipes, which also ensures adequate cooling of the Slats through the flowing water and the tight fit of the fins on the pipes over the life of the Heat exchanger is guaranteed.
  • primary heat exchangers have high combustion gas temperatures of, for example, 1300 ° C and therefore exposed to this on adequate cooling of the slats in particular to pay attention to, you have so far a soldered version of the Primary heat exchangers considered essential.
  • the inventive method for producing a Heat exchanger according to the features of claim 1 allows a purely mechanical and because of the elimination of Soldering work also shortened assembly of a Heat exchanger for use in High temperature range is determined.
  • each tube is separated by one pushed through, preferably driven in rotation Tool expanded, the excess of which is not expanded inner diameter of the pipe in coordination with the material and the wall thickness of the pipe is dimensioned so that on both sides of the slat feet or Lamella collar form beads on the outer circumference of the tube.
  • the Bumps lie on the slat feet or slat edges firmly, which causes the heat transfer from the fins to the Tube is additionally reinforced.
  • the beads also increase the Strength of the slat seat and prevent the Axially move fins away when expanding the pipe. By the high working pressure also causes the inner wall to roll of the pipe, which also causes the boiling noise behavior of the Heat exchanger is improved.
  • Figure 1 is shown to scale and enlarged a partial longitudinal section through a tube Primary heat exchanger with fins in front of the Expanding the pipe by the tool shown, and Figure 2 shows the same pipe section after expansion.
  • a working in the high temperature range of approx. 1300 ° C Has primary heat exchanger of a gas-fired water heater a number of tubes 10 lying parallel next to one another, which enforce a package of slats 12 which between column 14 for the passage of the combustion gases limit.
  • Each lamella 12 has its through opening or at its foot region 16 a collar 17 which the tube 10th encloses. In the initial state, the inside diameter of the Collar 17 so on the outside diameter of the still smooth Tube 10 matched that the parts without a gap let them fit together.
  • the tubes 10 and the fins 12 are preferably made of copper.
  • each Tube expanded by a tool 18 that passes through the tube is pushed through and is driven in rotation.
  • the tool 18 has a working head (calotte) 20 which is a has cylindrical core part 22, which on its circumference with four chamfered 90 ° on the side Print bars 24 is populated.
  • the work surfaces 26 each two radially opposite pressure bars 24 are in the Distance D from each other, which is slightly larger than that Inner diameter d of the undeformed tube 10 is dimensioned. The excess is in coordination with the wall thickness s of the Tube 10 and its material selected so that the Widen the pipe material firmly to the foot areas 16 or Collar 17 of the fins 12 presses and there radially material displaced to the outside on both sides of this Bulges areas to beads 28.
  • the tubes 10 made of copper have one Inner diameter d of 19 mm, a wall thickness s of 1 mm and the working head 20 has an oversize D-d of 0.3 mm.
  • the beads 12 make the lamellae 12 particularly firm and form-fitting with the tubes 10 in the axial direction connected.
  • the interfaces between the fins 12 and the tubes 10 enlarged so that also results in a particularly good heat transfer.
  • To the Inner walls of the tubes 10 are located at the locations of the beads 28 the pipe material is squeezed outwards, resulting in there annular bulges 30 result. That leads to one undulating formation of the inner wall surfaces, whereby the Boiling noise behavior of the primary heat exchanger improved becomes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

Heat exchanger production comprises the use of a rotating oversized expander tool working at high pressure. The heat exchanger has pipes and lamella, forming gaps for combustion gas passage. The working pressure expanding the pipes (10), especially the pressure between pipe and lamella (12) and the size of the lamella, are chosen, so that with combustion gas temperatures of ca. 1300 degrees C, the lamella foot sections (16) are cooled to below the recrystallization temperature of the lamella material. This guarantees the seat of the lamella on the pipes without soldering. Each pipe is expanded by an oversized rotating tool (20) passing through it.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren zur Herstellung eines Wärmeübertragers nach der Gattung des Hauptanspruchs. Bei den bekannten Primärwärmeübertragern für brennstoffbeheizte Wassererhitzer sind die Lamellen mit den wasserführenden Rohren verlötet, wobei es zur Minimierung des Lötspaltes auch bekannt ist, die Rohre nach dem Fügen der Lamellen durch Hindurchschieben eines rotierend angetriebenen Werkzeugs aufzuweiten. Die Lötverbindung sichert einen einwandfreien Wärmeübergang von den Lamellen auf die Rohre, wodurch auch eine ausreichende Kühlung der Lamellen durch das durchfließende Wasser und der Festsitz der Lamellen auf den Rohren über die Lebensdauer des Wärmeübertragers gewährleistet ist. Mit Rücksicht darauf, daß Primärwärmeübertrager hohen Verbrennungsgastemperaturen von beispielsweise 1300° C ausgesetzt sind und daher bei diesen auf eine ausreichende Kühlung der Lamellen besonders zu achten ist, hat man bisher eine gelötete Ausführung der Primärwärmeübertrager als unumgänglich erachtet. The invention is based on a method of manufacture a heat exchanger according to the preamble of the main claim. In the known primary heat exchangers for fuel-heated water heaters are the fins with the water pipes are soldered, taking it to minimize the soldering gap is also known, the tubes after joining of the slats by sliding one rotating driven tool to expand. The solder joint ensures perfect heat transfer from the slats on the pipes, which also ensures adequate cooling of the Slats through the flowing water and the tight fit of the fins on the pipes over the life of the Heat exchanger is guaranteed. With regard to that primary heat exchangers have high combustion gas temperatures of, for example, 1300 ° C and therefore exposed to this on adequate cooling of the slats in particular to pay attention to, you have so far a soldered version of the Primary heat exchangers considered essential.

Zum Stand der Technik gehören ferner Sekundärwärmeübertrager von Brennwertgeräten, bei denen die Lamellen nicht an die Rohre angelötet, sondern an diesen nur durch Aufweiten der Rohre festgelegt sind (EP 0 184 612 B2). Diese Sekundärwärmeübertrager arbeiten im Niedertemperaturbereich, weswegen man bei ihnen von einer bei Primärwärmeübertragern als notwendig erachteten Lötverbindung der Teile abgesehen hat.Secondary heat exchangers also belong to the prior art of condensing boilers in which the slats are not connected to the Pipes are soldered on, but only by widening them Pipes are specified (EP 0 184 612 B2). This Secondary heat exchangers work in the low temperature range, which is why they are one of primary heat exchangers apart from the solder connection of the parts deemed necessary Has.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren zur Herstellung eines Wärmeübertragers nach den Merkmalen des Anspruchs 1 ermöglicht eine rein mechanische und wegen Wegfalls der Lötarbeiten auch zeitlich verkürzte Montage eines Wärmeübertragers, der für den Einsatz im Hochtemperaturbereich bestimmt ist.The inventive method for producing a Heat exchanger according to the features of claim 1 allows a purely mechanical and because of the elimination of Soldering work also shortened assembly of a Heat exchanger for use in High temperature range is determined.

Bei einer bevorzugten Ausführung wird jedes Rohr durch ein hindurchgeschobenes, vorzugsweise rotierend angetriebenes Werkzeug aufgeweitet, dessen Übermaß gegenüber dem nicht aufgeweiteten Innendurchmesser des Rohres in Abstimmung mit dem Werkstoff und der Wandstärke des Rohres so bemessen ist, daß sich zu beiden Seiten der Lamellenfüße bzw. Lamellenkragen Wülste am Außenumfang des Rohres bilden. Die Wülste legen sich an die Lamellenfüße bzw. Lamellenkanten fest an, wodurch der Wärmeübergang von den Lamellen auf das Rohr zusätzlich verstärkt wird. Die Wülste erhöhen zudem die Festigkeit des Lamellensitzes und verhindern, daß die Lamellen beim Aufweiten des Rohres axial wegwandern. Durch den hohen Arbeitsdruck bedingt wälzt sich auch die Innenwand des Rohres, wodurch auch das Siedegeräuschverhalten des Wärmeübertragers verbessert wird. In a preferred embodiment, each tube is separated by one pushed through, preferably driven in rotation Tool expanded, the excess of which is not expanded inner diameter of the pipe in coordination with the material and the wall thickness of the pipe is dimensioned so that on both sides of the slat feet or Lamella collar form beads on the outer circumference of the tube. The Bumps lie on the slat feet or slat edges firmly, which causes the heat transfer from the fins to the Tube is additionally reinforced. The beads also increase the Strength of the slat seat and prevent the Axially move fins away when expanding the pipe. By the high working pressure also causes the inner wall to roll of the pipe, which also causes the boiling noise behavior of the Heat exchanger is improved.

Bei Verwendung von Lamellen und Rohren aus Kupfer wird durch den Wegfall des Lötvorgangs auch ein Weichglühen der Teile vermieden und dadurch das Handling des vorgefertigten Lamellenblocks bei der Montage des Primärwärmeübertragers erleichtert. Außerdem können die Anschlüsse am Primärwärmeübertrager ohne Zusatzteile direkt in den Rohren integriert werden.When using fins and tubes made of copper, through the elimination of the soldering process also a soft annealing of the parts avoided and thereby the handling of the prefabricated Lamella blocks when installing the primary heat exchanger facilitated. In addition, the connections on Primary heat exchanger without additional parts directly in the pipes to get integrated.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 unmaßstäblich und vergrößert einen Teil-Längsschnitt durch ein Rohr eines Primärwärmeübertragers mit aufgesetzten Lamellen vor dem Aufweiten des Rohres durch das dargestellte Werkzeug, und Figur 2 den gleichen Rohrabschnitt nach dem Aufweiten.An embodiment of the invention is in the drawing shown and in the following description explained. Figure 1 is shown to scale and enlarged a partial longitudinal section through a tube Primary heat exchanger with fins in front of the Expanding the pipe by the tool shown, and Figure 2 shows the same pipe section after expansion.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein im Hochtemperaturbereich von ca. 1300° C arbeitender Primärwärmeübertrager eines gasbeheizten Wassererhitzers hat eine Anzahl von parallel nebeneinander liegenden Rohren 10, die ein Paket von Lamellen 12 durchsetzen, welche zwischen sich Spalte 14 zum Durchtritt der Verbrennungsgase begrenzen. Jede Lamelle 12 hat an ihrer Durchgangsöffnung bzw. an ihrem Fußbereich 16 einen Kragen 17, der das Rohr 10 umschließt. Im Ausgangszustand ist der Innendurchmesser des Kragens 17 so auf den Außendurchmesser des noch glatten Rohres 10 abgestimmt, daß sich die Teile spaltlos ineinanderfügen lassen. Die Rohre 10 und die Lamellen 12 sind vorzugsweise aus Kupfer hergestellt.A working in the high temperature range of approx. 1300 ° C Has primary heat exchanger of a gas-fired water heater a number of tubes 10 lying parallel next to one another, which enforce a package of slats 12 which between column 14 for the passage of the combustion gases limit. Each lamella 12 has its through opening or at its foot region 16 a collar 17 which the tube 10th encloses. In the initial state, the inside diameter of the Collar 17 so on the outside diameter of the still smooth Tube 10 matched that the parts without a gap let them fit together. The tubes 10 and the fins 12 are preferably made of copper.

Zum Befestigen der Lamellen 12 auf den Rohren 10 wird jedes Rohr durch ein Werkzeug 18 aufgeweitet, das durch das Rohr hindurchgeschoben wird und dabei rotierend angetrieben ist. Das Werkzeug 18 hat einen Arbeitskopf (Kalotte) 20, der ein zylindrisches Kernteil 22 aufweist, welches an seinem Umfang mit vier um 90° versetzten, seitlich angephasten Druckleisten 24 bestückt ist. Die Arbeitsflächen 26 von je zwei radial sich gegenüberliegenden Druckleisten 24 sind im Abstand D voneinander entfernt, der etwas größer als der Innendurchmesser d des unverformten Rohres 10 bemessen ist. Das Übermaß ist in Abstimmung mit der Wandstärke s des Rohres 10 und dessen Werkstoff so gewählt, daß sich beim Aufweiten das Rohrmaterial fest an die Fußbereiche 16 bzw. Kragen 17 der Lamellen 12 anpreßt und sich das dort radial nach außen verdrängte Material zu beiden Seiten dieser Bereiche zu Wulsten 28 aufwölbt. Bei einer praktischen Ausführung haben die aus Kupfer gefertigten Rohre 10 einen Innendurchmesser d von 19 mm, eine Wandstärke s von 1 mm und der Arbeitskopf 20 ein Übermaß D-d von 0,3 mm.To attach the fins 12 on the tubes 10 each Tube expanded by a tool 18 that passes through the tube is pushed through and is driven in rotation. The tool 18 has a working head (calotte) 20 which is a has cylindrical core part 22, which on its circumference with four chamfered 90 ° on the side Print bars 24 is populated. The work surfaces 26 each two radially opposite pressure bars 24 are in the Distance D from each other, which is slightly larger than that Inner diameter d of the undeformed tube 10 is dimensioned. The excess is in coordination with the wall thickness s of the Tube 10 and its material selected so that the Widen the pipe material firmly to the foot areas 16 or Collar 17 of the fins 12 presses and there radially material displaced to the outside on both sides of this Bulges areas to beads 28. With a practical Execution, the tubes 10 made of copper have one Inner diameter d of 19 mm, a wall thickness s of 1 mm and the working head 20 has an oversize D-d of 0.3 mm.

Durch die Wulste 28 werden die Lamellen 12 besonders fest und in axialer Richtung formschlüssig mit den Rohren 10 verbunden. Außerdem werden die Berührungsflächen zwischen den Lamellen 12 und den Rohren 10 vergrößert, so daß sich auch ein besonders guter Wärmeübergang ergibt. An den Innenwänden der Rohre 10 wird an den Stellen der Wulste 28 das Rohrmaterial nach außen geguetscht, wodurch sich dort ringförmige Ausbuchtungen 30 ergeben. Das führt zu einer welligen Ausbildung der Innenwandflächen, wodurch das Siedegeräuschverhalten des Primärwärmeübertragers verbessert wird.The beads 12 make the lamellae 12 particularly firm and form-fitting with the tubes 10 in the axial direction connected. In addition, the interfaces between the fins 12 and the tubes 10 enlarged so that also results in a particularly good heat transfer. To the Inner walls of the tubes 10 are located at the locations of the beads 28 the pipe material is squeezed outwards, resulting in there annular bulges 30 result. That leads to one undulating formation of the inner wall surfaces, whereby the Boiling noise behavior of the primary heat exchanger improved becomes.

Zur Toleranzeinhaltung der Länge des Lamellenblocks wird dieser während des Aufweitens der Rohre an den parallel zu den Lamellen 12 verlaufenden Stirnseiten auf Maß gehalten, wobei dem Lamellenblock ein festgelegtes Spiel im Aufweitewerkzeug zugestanden wird.To keep the length of the slat block within tolerance this while expanding the pipes parallel to the the slats 12 extending end faces kept to measure, with the slat block a fixed game in Expanding tool is allowed.

Claims (2)

Verfahren zur Herstellung eines Wärmeübertragers für brennstoffbeheizte Wassererhitzer, mit wasserführenden Rohren und von diesen durchsetzten Lamellen, die zwischen sich Spalte zum Durchtritt der Verbrennungsgase bilden und durch Aufweiten der Rohre spaltlos an deren Umfang anliegen, dadurch gekennzeichnet, daß der die Rohre (10) aufweitende Arbeitsdruck bzw. der Preßdruck zwischen Rohr (10) und Lamelle (12) so groß gewählt und die Lamellen (12) so gestaltet bzw. bemessen sind, daß auch bei Verbrennungsgastemperaturen im Bereich von etwa 1300°C die Lamellenfußbereiche (16) unter die Rekristallisationstemperatur des Lamellenwerkstoffs gekühlt werden, so daß ein Festsitz der Lamellen (12) auf den Rohren ohne Lötung gewährleistet ist.Process for the production of a heat exchanger for fuel-heated water heater, with water-bearing Pipes and lamellas penetrated by them, which between gaps form for the passage of the combustion gases and by widening the pipes without gaps against their circumference, characterized in that the tubes (10) widen Working pressure or the pressure between the tube (10) and Lamella (12) chosen so large and the slats (12) so are designed or dimensioned that also at Combustion gas temperatures in the range of about 1300 ° C Slat base areas (16) under the Cooled recrystallization temperature of the lamella material be so that the slats (12) are firmly seated on the pipes guaranteed without soldering. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß jedes Rohr (10) durch ein hindurchgeschobenes, vorzugsweise rotierend angetriebenes Werkzeug (Kalotte 20) aufgeweitet wird, dessen Übermaß gegenüber dem nicht aufgeweiteten Innendurchmesser des Rohres (10) in Abstimmung mit dem Werkstoff und der Wandstärke des Rohres (10) so bemessen ist, daß sich zu beiden Seiten der Lamellenfüße (16) bzw. Lamellenkragen (17) Wülste (28) am Außenumfang des Rohres (10) bilden.A method according to claim 1, characterized in that each tube (10) through a pushed through, preferably rotating driven tool (calotte 20) expanded the excess of which is not expanded Inner diameter of the tube (10) in coordination with the Measure the material and the wall thickness of the tube (10) in this way is that on both sides of the slat feet (16) or Lamella collar (17) beads (28) on the outer circumference of the tube (10) form.
EP98122043A 1998-01-28 1998-11-20 Method for producing a heat exchanger for fuel fired water heaters Ceased EP0933150A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998103177 DE19803177B4 (en) 1998-01-28 1998-01-28 Process for producing a heat exchanger for fuel-fired water heaters
DE19803177 1998-01-28

Publications (2)

Publication Number Publication Date
EP0933150A2 true EP0933150A2 (en) 1999-08-04
EP0933150A3 EP0933150A3 (en) 2000-05-03

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EP98122043A Ceased EP0933150A3 (en) 1998-01-28 1998-11-20 Method for producing a heat exchanger for fuel fired water heaters

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518442A (en) * 2018-12-24 2019-03-26 河南科隆集团有限公司 A kind of rotation bulging clothes dryer condenser structure
CN112683098A (en) * 2020-12-31 2021-04-20 南宁市安和机械设备有限公司 Oil cooler pipe with staggered dotting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211591B4 (en) * 2002-03-15 2005-06-02 J. Eberspächer GmbH & Co. KG Air heater for integration into an air-conducting housing arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR794298A (en) * 1934-11-17 1936-02-12 Labo Method of attaching fins to finned tubes and other parts
DE722235C (en) * 1932-04-16 1942-07-04 Manuf Generale Metallurg Sa Process for the manufacture of finned tubes
US4970770A (en) * 1986-02-13 1990-11-20 Flakt, Ab Method of making a coated heat exchanger with tubes and fins

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432905A (en) * 1964-07-06 1969-03-18 Halcon International Inc Method of fabricating heat transfer tubing
DE3522036A1 (en) * 1984-09-18 1986-03-20 Robert Bosch Gmbh, 7000 Stuttgart HEAT EXCHANGER, ESPECIALLY FOR GAS OR OIL HEATED WATER HEATERS
US4706355A (en) * 1984-12-11 1987-11-17 Q-Dot Corporation Method of making an internally grooved and expanded tubular heat exchanger apparatus
DD276441A1 (en) * 1988-10-31 1990-02-28 Mylau Apparatebau METHOD FOR PRODUCING A HEAT-CONDUCTIVE CONNECTION BETWEEN HEAT TRANSFER PIPES AND SURFACE-ENLARGING ELEMENTS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE722235C (en) * 1932-04-16 1942-07-04 Manuf Generale Metallurg Sa Process for the manufacture of finned tubes
FR794298A (en) * 1934-11-17 1936-02-12 Labo Method of attaching fins to finned tubes and other parts
US4970770A (en) * 1986-02-13 1990-11-20 Flakt, Ab Method of making a coated heat exchanger with tubes and fins

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518442A (en) * 2018-12-24 2019-03-26 河南科隆集团有限公司 A kind of rotation bulging clothes dryer condenser structure
CN109518442B (en) * 2018-12-24 2023-09-26 河南科隆集团有限公司 Rotary bulging dryer condenser structure
CN112683098A (en) * 2020-12-31 2021-04-20 南宁市安和机械设备有限公司 Oil cooler pipe with staggered dotting

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DE19803177A1 (en) 1999-08-05
DE19803177B4 (en) 2005-03-03
EP0933150A3 (en) 2000-05-03

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