EP0092010A1 - Formen von Rohren mit Turbulenzwirkung für Wärmetauscher - Google Patents

Formen von Rohren mit Turbulenzwirkung für Wärmetauscher Download PDF

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Publication number
EP0092010A1
EP0092010A1 EP82400670A EP82400670A EP0092010A1 EP 0092010 A1 EP0092010 A1 EP 0092010A1 EP 82400670 A EP82400670 A EP 82400670A EP 82400670 A EP82400670 A EP 82400670A EP 0092010 A1 EP0092010 A1 EP 0092010A1
Authority
EP
European Patent Office
Prior art keywords
tube
knurling
knurls
barrel
shaping
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Withdrawn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
EP82400670A
Other languages
English (en)
French (fr)
Inventor
Marc Maury
Guy Hentges
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
Priority to EP82400670A priority Critical patent/EP0092010A1/de
Publication of EP0092010A1 publication Critical patent/EP0092010A1/de
Withdrawn legal-status Critical Current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
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside 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
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex

Definitions

  • the present invention relates to the shaping of thin single or double wall tubes, made of ferrous and non-ferrous metals intended for the manufacture of heat exchangers and other fluid transfer systems with helical or turbulent stirring.
  • it relates to a helical or annular knurling process on the passing of a thin-walled tube on a standard cold forming machine with two knurls, according to which the tube subjected to knurling is driven by the knurls along a circular guide.
  • the main object of the invention is to provide a shaping process which can be carried out under economical conditions and which also guarantees the accuracy of the profiles sought.
  • the method according to the invention consists in using as a circular guide only an external cylindrical mandrel or "barrel” whose solid wall is notched opposite the knurls and in attacking the tube using the wheels through these notches.
  • the method according to the invention also consists in imparting a rough surface to the tube by giving an appropriate surface state to the knurls.
  • This surface roughness forms mini-cavities which increase the heat exchange surface.
  • these mini-cavities cause, in the refrigerant gas circulating outside the tube, turbulence favorable to heat exchange with the water circulating inside the tube.
  • the method also makes it possible to shape, at the same time, two tubes of neighboring diameters engaged one inside the other to obtain a double-walled tube.
  • the double-walled tube that can be produced according to the invention perfectly meets this requirement.
  • the "barrel” comprises, at its lower part, a rigid support 13 making it integral with the frame 14 of the machine.
  • each wheel 1 and 2 The entire working surface of each wheel 1 and 2 is treated by the so-called shot-blasting process in order to obtain micro-cavities 15 which give the wheel a rough appearance.
  • the projecting parts of the working area of each wheel 1 and 2 have ridges 16 obtained by a knurling operation.
  • the end of the tube 7 is introduced into the part 8 of the barrel while the knobs 1 and 2 rotate about their respective axes xx and yy.
  • the tube 7 comes into contact with the knobs 1 and 2, which penetrate inside the barrel, by the notches made in the central part 10 of the latter, the periphery of said tube is successively attacked by the profiles 3, 4 , 6 and 5, which drive the tube in rotation and make it progress towards part 9 of the barrel, by printing the desired imprint there.
  • the rotary drive is improved by the roughness and the striations of the working surface of the knobs 1 and 2, in the sense that any slipping of the tube is avoided so as to cause an overlap of the shaped propellers and a " stuffing" of the tube 7, blocking the latter in rotation.
  • the shaped tube 7 emerges from the machine, guided by the part 9 of the barrel. It has, according to the profile given to the knobs 1 and 2, a deep annular or helical imprint and its periphery weakly reproduces the streaks and roughness of the working surface of the knobs, in the form of corresponding streaks and micro-cavities. These give the tube a surface condition suitable for improving heat exchange (heat exchangers) because the exchange surface obtained with this system is larger than that of a smooth tube with the same dimensional characteristics.
  • the method according to the invention essentially derives its originality from the modes of guiding and driving the tube to be shaped which allows try to shape in a single pass helical or annular impressions on single or double wall tubes without length limitation, while limiting the rolling of the metal and the alteration of its primitive physical qualities.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
EP82400670A 1982-04-15 1982-04-15 Formen von Rohren mit Turbulenzwirkung für Wärmetauscher Withdrawn EP0092010A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP82400670A EP0092010A1 (de) 1982-04-15 1982-04-15 Formen von Rohren mit Turbulenzwirkung für Wärmetauscher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82400670A EP0092010A1 (de) 1982-04-15 1982-04-15 Formen von Rohren mit Turbulenzwirkung für Wärmetauscher

Publications (1)

Publication Number Publication Date
EP0092010A1 true EP0092010A1 (de) 1983-10-26

Family

ID=8189900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400670A Withdrawn EP0092010A1 (de) 1982-04-15 1982-04-15 Formen von Rohren mit Turbulenzwirkung für Wärmetauscher

Country Status (1)

Country Link
EP (1) EP0092010A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274719A3 (en) * 1987-01-13 1989-12-20 Gd-Anker Gmbh Thread-forming method and tubular body provided with a thread

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE55042C (de) * L. GObiet und L. carrer in Düsseldorf, Feldstr. 31 bezw. Immermannstr. 17 Walzvorrichtung zur Herstellung schraubenförmig gewellter Heizröhren
FR1118390A (fr) * 1954-02-01 1956-06-05 Gen Electric Co Ltd Procédé et machine à onduler les tubes en hélice
GB791513A (en) * 1954-02-01 1958-03-05 Pirelli General Cable Works Improvements in or relating to machines and methods for corrugating electric cable sheaths
US3387477A (en) * 1965-11-29 1968-06-11 Price Pfister Brass Mfg Apparatus and method for roll forming flexible tubing
US3538728A (en) * 1966-05-16 1970-11-10 Johns Manville Method and apparatus for producing flexible metal ducts
DE2517249A1 (de) * 1975-04-18 1976-10-28 Kabel Metallwerke Ghh Waermetauscherrohr aus metall mit einer schraubenlinienfoermigen wellung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE55042C (de) * L. GObiet und L. carrer in Düsseldorf, Feldstr. 31 bezw. Immermannstr. 17 Walzvorrichtung zur Herstellung schraubenförmig gewellter Heizröhren
FR1118390A (fr) * 1954-02-01 1956-06-05 Gen Electric Co Ltd Procédé et machine à onduler les tubes en hélice
GB791513A (en) * 1954-02-01 1958-03-05 Pirelli General Cable Works Improvements in or relating to machines and methods for corrugating electric cable sheaths
US3387477A (en) * 1965-11-29 1968-06-11 Price Pfister Brass Mfg Apparatus and method for roll forming flexible tubing
US3538728A (en) * 1966-05-16 1970-11-10 Johns Manville Method and apparatus for producing flexible metal ducts
DE2517249A1 (de) * 1975-04-18 1976-10-28 Kabel Metallwerke Ghh Waermetauscherrohr aus metall mit einer schraubenlinienfoermigen wellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274719A3 (en) * 1987-01-13 1989-12-20 Gd-Anker Gmbh Thread-forming method and tubular body provided with a thread

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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17P Request for examination filed

Effective date: 19840406

STAA Information on the status of an ep patent application or granted ep patent

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Effective date: 19850712