EP0468076A1 - Dispositif d'élargissement de tubes - Google Patents

Dispositif d'élargissement de tubes Download PDF

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Publication number
EP0468076A1
EP0468076A1 EP90114371A EP90114371A EP0468076A1 EP 0468076 A1 EP0468076 A1 EP 0468076A1 EP 90114371 A EP90114371 A EP 90114371A EP 90114371 A EP90114371 A EP 90114371A EP 0468076 A1 EP0468076 A1 EP 0468076A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
expansion sleeve
expanding
expansion
tube
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Withdrawn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
EP90114371A
Other languages
German (de)
English (en)
Inventor
Hans Dipl.-Ing. Kastl (Fh)
Helmut Ing. Grad. Mechtold
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP90114371A priority Critical patent/EP0468076A1/fr
Publication of EP0468076A1 publication Critical patent/EP0468076A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • B21D39/203—Tube expanders with mandrels, e.g. expandable expandable by fluid or elastic material

Definitions

  • the invention relates to a device for expanding a tube with a probe which can be inserted into the tube and which contains a radially expandable expansion sleeve made of an elastically highly deformable material.
  • Devices for expanding a tube are used, for example, for the gap-free connection of a heating tube in the tube sheet of a steam generator or for the so-called "sleeving" of tubes.
  • the invention is based on the object of specifying a device for expanding a tube with which a largely uniform expansion and a smooth transition between the expansion area and the non-expanded area can be achieved over the largest possible expansion length.
  • contact with a liquid should be avoided in the widening area and it should also be possible to reach hard-to-reach places inside a pipe.
  • the expansion sleeve consists of an elastomer.
  • the expansion sleeve preferably comprises a central area with an approximately constant wall thickness, which is adjoined by an area with a continuously increasing wall thickness.
  • the expanding sleeve is supported with its opposite end edge regions in receiving sleeves which are connected to one another in a tensile manner via a central pull rod.
  • This pull rod is preferably also used to supply the pressure medium to the inner surface of the expansion sleeve.
  • the receiving sleeve is preferably embedded with its front edge regions in a hollow cylindrical recess located between the pull rod and the receiving sleeve.
  • means are provided which, in the event of an axial shortening of the expansion sleeve caused by pressurization, bring about an axial tracking of at least one of the two receiving sleeves.
  • a device for expanding a tube contains an expanding sleeve 2 made of a material with high elastic deformability speed, preferably an elastomer with a hardness between 90 Shore and 100 Shore, for example Fibroflex (trademark of FIBRO).
  • the expansion sleeve 2 is supported with its front edge areas in receiving sleeves 4 and 6.
  • the receiving sleeves 4 and 6 are fixed by a pull rod 16 screwed to an end sleeve 12.
  • the pull rod 16 is also designed as a probe head 10 and is provided with a shoulder in the region of the probe head 10, on which the receiving sleeve 4 is supported.
  • the expansion sleeve 2 has in its central region 3 an approximately hollow cylindrical shape with a relatively small wall thickness. With an expansion probe for a 7/8 "tube and an expansion length of approximately 50 mm, this wall thickness is approximately 1 mm with an outer diameter of approximately 9 mm.
  • the pull rod 16 is provided with an axially inside continuous longitudinal channel 18 for a pressure medium, which is supplied via a bore 20 arranged in the end sleeve 12 and a threaded medium connection 21 for a hydraulic line.
  • a threaded pin 22 provided with a sealing cone 23 is provided in the head part 10 of the pull rod 16 for venting and for closing the longitudinal channel 18.
  • the pull rod 16 is provided in its area surrounded by the expansion sleeve 2 with a plurality of radial channels 30 and 32 through which the pressure medium from the longitudinal channel 18 passes between the pull rod 16 and the expansion sleeve 2. Sealing rings 40 and 41 prevent the pressure medium from penetrating into the spaces between the pull rod 16 and the receiving sleeves 4 and 6 and escaping to the outside.
  • the expanding sleeve 2 is provided in the region of the edge of the receiving sleeve 4 or 6 surrounding it in a ring shape with an annular circumferential groove for receiving an O-ring 46 or 47.
  • the O-rings 46 and 47 protect the expansion sleeve 2 from damage when the expansion sleeve 2 is squeezed into the cavities between the receiving sleeves 4 and 6 and the pipe to be expanded when pressure is applied.
  • it is also reinforced in a bead-like manner in the vicinity of the O-rings 46 and 47.
  • the expansion area is also limited by the O-rings 46 and 47.
  • the expansion sleeve 2 comprises a central area 3 with an approximately constant small wall thickness, which is adjoined by an area with a continuously increasing wall thickness, which merges into the bead-like reinforcement. This measure creates a widening area with a widening that is as uniform as possible, which merges smoothly and smoothly into the unexpanded area of the tube.
  • 14 compensation sleeves 8 and 9 are provided between the receiving sleeves 6 and 4 and the end sleeve 12 or a probe head.
  • the probe head 14 is a separate part which is screwed to the end sleeve 12 via a pull rod 17.
  • channels 34 and 36 respectively, which open into an annular cavity 35 and 37 surrounding the tie rod 17.
  • the cavities 35 and 37 are each delimited by a shoulder 38 or 39 and by the probe head 14 screwed to the pull rod 17 or by the end sleeve 12. Sealing rings 42, 43, 44 and 45 prevent the pressure medium penetrating into the cavities 35 and 37 from escaping.
  • the travel compensation sleeves 8 and 10 are axially displaceable in the direction of the expansion sleeve 2.
  • a force is generated which is directed axially towards the center of the probe and which compensates for an axial shortening of the expansion sleeve 2 caused by the radial expansion of the expansion sleeve 2. This can prevent the expansion sleeve 2 from pulling out of the receiving sleeves 4 and 6 when pressure is applied, and leaks occur at the sealing rings 40 and 41, respectively, which result in the pressure medium escaping.
  • the example of the figure shows the device for expanding a tube in a sleeve tube 52 arranged inside a heating tube 50 of a heat exchanger.
  • pressure for example 1200 bar
  • the expansion sleeve 2 is inflated and pressed between the O-rings 46 and 47 in their entire lying area 3 to the sleeve tube 52.
  • the sleeve pipe 52 then lies against the heating pipe 50.
  • a gap-free connection is created between the sleeve pipe 52 and the heating pipe 50 almost in the entire expansion area, which enables the two pipes to be welded subsequently.
  • the entire expansion area is composed of a largely cylindrical area A opposite the central area 3 of the expansion sleeve and adjoining smooth transition areas B caused by the bead-like reinforcements of the expansion sleeve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
EP90114371A 1990-07-26 1990-07-26 Dispositif d'élargissement de tubes Withdrawn EP0468076A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90114371A EP0468076A1 (fr) 1990-07-26 1990-07-26 Dispositif d'élargissement de tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90114371A EP0468076A1 (fr) 1990-07-26 1990-07-26 Dispositif d'élargissement de tubes

Publications (1)

Publication Number Publication Date
EP0468076A1 true EP0468076A1 (fr) 1992-01-29

Family

ID=8204266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114371A Withdrawn EP0468076A1 (fr) 1990-07-26 1990-07-26 Dispositif d'élargissement de tubes

Country Status (1)

Country Link
EP (1) EP0468076A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996035527A1 (fr) * 1995-05-11 1996-11-14 Siemens Aktiengesellschaft Dispositif permettant d'elargir un tuyau
US5907965A (en) * 1995-05-11 1999-06-01 Siemens Aktiengesellschaft Device for expanding a tube

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1330224A (fr) * 1962-05-08 1963-06-21 Fives Lille Cail Dudgeonnage hydraulique des tubes dans une plaque tubulaire
FR1365999A (fr) * 1963-04-11 1964-07-10 Fives Lille Cail Dudgeonnage hydraulique de tubes dans une plaque tubulaire
FR1527073A (fr) * 1967-04-14 1968-05-31 Dudgeon flexible dilatable
EP0041835A2 (fr) * 1980-06-05 1981-12-16 The Babcock & Wilcox Company Elargissement de tubes
CA1152876A (fr) * 1981-11-17 1983-08-30 John A. Aikin Distendeur hydraulique a vessie
BE902924A (fr) * 1985-07-18 1986-01-20 Cockerill Mech Ind Sa Outil d'expansion hydraulique pour structure tubulaire
EP0177045A1 (fr) * 1984-10-04 1986-04-09 Westinghouse Electric Corporation Mandrin de tuyau pour la dilatation hydraulique de tubes et douilles
DE3720485A1 (de) * 1987-06-20 1989-01-05 Emitec Emissionstechnologie Vorrichtung zum aufweiten von rohren

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1330224A (fr) * 1962-05-08 1963-06-21 Fives Lille Cail Dudgeonnage hydraulique des tubes dans une plaque tubulaire
FR1365999A (fr) * 1963-04-11 1964-07-10 Fives Lille Cail Dudgeonnage hydraulique de tubes dans une plaque tubulaire
FR1527073A (fr) * 1967-04-14 1968-05-31 Dudgeon flexible dilatable
EP0041835A2 (fr) * 1980-06-05 1981-12-16 The Babcock & Wilcox Company Elargissement de tubes
CA1152876A (fr) * 1981-11-17 1983-08-30 John A. Aikin Distendeur hydraulique a vessie
EP0177045A1 (fr) * 1984-10-04 1986-04-09 Westinghouse Electric Corporation Mandrin de tuyau pour la dilatation hydraulique de tubes et douilles
BE902924A (fr) * 1985-07-18 1986-01-20 Cockerill Mech Ind Sa Outil d'expansion hydraulique pour structure tubulaire
DE3720485A1 (de) * 1987-06-20 1989-01-05 Emitec Emissionstechnologie Vorrichtung zum aufweiten von rohren

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996035527A1 (fr) * 1995-05-11 1996-11-14 Siemens Aktiengesellschaft Dispositif permettant d'elargir un tuyau
US5907965A (en) * 1995-05-11 1999-06-01 Siemens Aktiengesellschaft Device for expanding a tube

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