EP0092010A1 - Formen von Rohren mit Turbulenzwirkung für Wärmetauscher - Google Patents
Formen von Rohren mit Turbulenzwirkung für Wärmetauscher Download PDFInfo
- 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- Withdrawn
Links
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0274719A2 (de) * | 1987-01-13 | 1988-07-20 | Gd-Anker Gmbh | Verfahren zur Formung eines Gewindes und Rohrkörper mit Gewinde |
Citations (6)
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 |
-
1982
- 1982-04-15 EP EP82400670A patent/EP0092010A1/de not_active Withdrawn
Patent Citations (6)
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 (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0274719A2 (de) * | 1987-01-13 | 1988-07-20 | Gd-Anker Gmbh | Verfahren zur Formung eines Gewindes und Rohrkörper mit Gewinde |
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19840406 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19850712 |