EP0795365A1 - Process of making a fluid flow tube with varying cross section - Google Patents

Process of making a fluid flow tube with varying cross section Download PDF

Info

Publication number
EP0795365A1
EP0795365A1 EP96200712A EP96200712A EP0795365A1 EP 0795365 A1 EP0795365 A1 EP 0795365A1 EP 96200712 A EP96200712 A EP 96200712A EP 96200712 A EP96200712 A EP 96200712A EP 0795365 A1 EP0795365 A1 EP 0795365A1
Authority
EP
European Patent Office
Prior art keywords
tube
section
cross
process according
wall
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Withdrawn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
EP96200712A
Other languages
German (de)
French (fr)
Inventor
Bjorn Vestergaard
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.)
Norsk Hydro ASA
Original Assignee
Norsk Hydro ASA
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 Norsk Hydro ASA filed Critical Norsk Hydro ASA
Priority to EP96200712A priority Critical patent/EP0795365A1/en
Publication of EP0795365A1 publication Critical patent/EP0795365A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • 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
    • B21C37/151—Making tubes with multiple passages
    • 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
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • 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
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/202—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with guides parallel to the tube axis
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F28D1/0478—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels

Definitions

  • the invention relates to a process for making a fluid flow tube with varying cross section. Such a process is known from US-A-3.625.257.
  • This object is achieved by extruding a tube with a constant cross section, positioning the tube in a die having substantially the cross section of the outer wall of the end tube and increasing the pressure inside the tube, thereby deforming the tube so that its outer wall confirms to the die form.
  • the fluid flow tube 10 of generally oval cross section has parallel top 11 and bottom 12 webs with the interior being separated into a number of parallel fluid flow passages 13, 14 and 15 by a pair of spaced longitudinal dividing walls or partitions 16 and 17.
  • the partitions 16 and 17 can have the form shown in cross section in Fig. 2 and 3 or similar.
  • the partition has the shape of two truncated cones fixed to each other by their shortest edges.
  • the partitions 16 and 17 have a central section 19 with a reduced thickness offer a reduced strength and thereby allowing the partition 16 or 17 to be broken more easily when an increasing pressure is applied to the interior of the flow channels.
  • the flow channels in the undeformed position of the tube are still separated from each other thereby offering the well known advantage of the so called multiport extrusion tubes.
  • the partition 16 shown in fig. 3 has a modified cross section. Both sides of the central section 19 are provided with a notch like saving 20 and 21, thereby providing a portion with reduced strength. In this way it is achieved that upon applying pressure the partitions 16 and 17 will preferably split at the portions with reduced strength.
  • fig. 4 is shown part of a multiport extrusion tube 25.
  • the tube 25 as extruded is shown in cross section in the right hand section A of this figure, wherein the partitions 26, 27, 28 are still in their original form and shape.
  • the left hand section B of fig. 4 is shown the tube after being expanded by increasing the pressure internally.
  • the partitions 26, 27 and 28 have been broken in the central portion and each half partition is still extending into the interior of the tube 25.
  • FIG. 5 - 7 is shown a practical application of the process.
  • a tube 35 has been made by means of an extrusion process and thereupon been reshaped to the form shown in fig. 5.
  • This form corresponds to the form the tube must have in its final application, in this case an evaporator provided with a suction accumulator. It could also be a condenser with a receiver.
  • the tube may be of the type of a multiport extruded tube, but any other tube is also possible.
  • Fig. 6 the tube of Fig. 5 has been positioned with a die 36 shown in cross section.
  • the die 36 consists of two portions, each provided with savings which are mirror-image of each other, the savings corresponding to the final form the tube 35 must take.
  • the savings in the die are very closely fitting to the serpentine bent portion of the tube, but at the portion 37 of the tube 35 there is a more spacious saving 38, giving some freedom of movement to the tube.
  • the tube 35 After positioning the tube 35 into one part of the die 36 and closing the die by bringing together its two portions, pressure is applied to the interior of the tube. If needed the die may be preheated and/or heated while the increased pressure is applied. If sufficient pressure is applied the tube portion 37 will be expanded in order to confirm itself to the wall of the die at that location, as shown in fig. 7. After removing the pressure from the interior of the tube and if needed cooling of the tube, the tube with its expanded portion can be removed from the die and further processed to its final application. In order to avoid further deformation each and of the tube can be clamped during the expansion process.
  • the tube may be made of different materials, either metal or plastics or any other material capable of maintaining its shape after controlled deformation, the invention is preferably applied with tubes made of aluminum or aluminum alloy.

Landscapes

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

Abstract

A process for making a fluid tube (10) with a varying cross section comprising extruding a tube with a constant cross section, positioning the extruded tube in a die having substantially the cross section of the outer wall of the end tube and increasing the pressure inside the extruded tube, thereby deforming the tube, so that its outer wall confirms to the die form. The tube is a multiport extruded tube, in which the partition walls (16,17) are provided with at least one portion (19) with reduced thickness, the partition walls being broken during expansion.

Description

  • The invention relates to a process for making a fluid flow tube with varying cross section.
    Such a process is known from US-A-3.625.257.
  • In this patent specification there is described a process wherein a tube is extruded with a constant cross section and provided with one or more longitudinally extending partitions dividing the tube into a plurality of flow passages. In order to provide a fitting with enlarged circular cross section, the partitions are split at an end portion of the tube and the tube end reshaped into a circular cross section.
  • The process as described in said US-specification is restricted to the reshaping of the end portion of the tube as it is necessary to have access to the partitions to be slit. Practically it is nearly impossible to slit the partitions in intermediate portions without damaging the partitions in the end portions. This is especially true for tubes with small flowing channels, as it is impossible to introduce the necessary tools.
  • It is an object of the invention to provide a process for making a fluid flow tube with varying cross section, which makes it possible to produce tubes with widely varying configurations, especially with intermediate portions having a larger cross section than the portions which are closer to the ends of the tube.
  • This object is achieved by extruding a tube with a constant cross section, positioning the tube in a die having substantially the cross section of the outer wall of the end tube and increasing the pressure inside the tube, thereby deforming the tube so that its outer wall confirms to the die form.
  • By using this process it is possible to produce tubes with varying cross section, wherein the position of the portions with a cross section deviating from the original cross section can be freely chosen and is completely defined by the die form. Moreover it becomes possible to design the die in such a way that the shape of the cross section of each portion with modified cross section can be defined by the die shape.
  • Other features and advantages of the invention will be apparent from the following description, reference being made to the annexed drawings, in which :
    • Fig. 1
    is a cross section of a multiport extruded tube prior to be reshaped and reformed according to the invention.
    Fig. 2
    is a cross section (enlarged scale) of a partition wall of the tube of Fig. 1.
    Fig. 3
    is a cross section (enlarged scale) of a modified shape of a partition wall of the tube of Fig. 1.
    Fig. 4
    is a schematic representation of a tube with a deformed portion, showing the cross section of an original portion and a deformed portion end.
    Fig. 5, 6, 7
    show the different steps of making a tube according to the invention.
  • In the embodiment illustrated in Figs. 1 - 4 the fluid flow tube 10 of generally oval cross section has parallel top 11 and bottom 12 webs with the interior being separated into a number of parallel fluid flow passages 13, 14 and 15 by a pair of spaced longitudinal dividing walls or partitions 16 and 17. The partitions 16 and 17 can have the form shown in cross section in Fig. 2 and 3 or similar. In fig. 2 the partition has the shape of two truncated cones fixed to each other by their shortest edges. In this way the partitions 16 and 17 have a central section 19 with a reduced thickness offer a reduced strength and thereby allowing the partition 16 or 17 to be broken more easily when an increasing pressure is applied to the interior of the flow channels. At the same time the flow channels in the undeformed position of the tube are still separated from each other thereby offering the well known advantage of the so called multiport extrusion tubes.
  • The partition 16 shown in fig. 3 has a modified cross section. Both sides of the central section 19 are provided with a notch like saving 20 and 21, thereby providing a portion with reduced strength. In this way it is achieved that upon applying pressure the partitions 16 and 17 will preferably split at the portions with reduced strength.
  • In fig. 4 is shown part of a multiport extrusion tube 25.
    The tube 25 as extruded is shown in cross section in the right hand section A of this figure, wherein the partitions 26, 27, 28 are still in their original form and shape. In the left hand section B of fig. 4 is shown the tube after being expanded by increasing the pressure internally. As shown the partitions 26, 27 and 28 have been broken in the central portion and each half partition is still extending into the interior of the tube 25. These protrusions are still contributing in the heat exchanging process between the fluid and the wall of the tube 25, as they increase the contact surface with the fluid.
  • In Fig. 5 - 7 is shown a practical application of the process. A tube 35 has been made by means of an extrusion process and thereupon been reshaped to the form shown in fig. 5. This form corresponds to the form the tube must have in its final application, in this case an evaporator provided with a suction accumulator. It could also be a condenser with a receiver. The tube may be of the type of a multiport extruded tube, but any other tube is also possible.
  • In Fig. 6 the tube of Fig. 5 has been positioned with a die 36 shown in cross section. The die 36 consists of two portions, each provided with savings which are mirror-image of each other, the savings corresponding to the final form the tube 35 must take. In this case the savings in the die are very closely fitting to the serpentine bent portion of the tube, but at the portion 37 of the tube 35 there is a more spacious saving 38, giving some freedom of movement to the tube.
  • After positioning the tube 35 into one part of the die 36 and closing the die by bringing together its two portions, pressure is applied to the interior of the tube. If needed the die may be preheated and/or heated while the increased pressure is applied. If sufficient pressure is applied the tube portion 37 will be expanded in order to confirm itself to the wall of the die at that location, as shown in fig. 7. After removing the pressure from the interior of the tube and if needed cooling of the tube, the tube with its expanded portion can be removed from the die and further processed to its final application. In order to avoid further deformation each and of the tube can be clamped during the expansion process.
  • It may be obvious that the invention is not restricted to the embodiment shown and described. More especially it is possible to use the invention with other type of tubes, such a s tubes without partitions or other cross sections.
  • Although the tube may be made of different materials, either metal or plastics or any other material capable of maintaining its shape after controlled deformation, the invention is preferably applied with tubes made of aluminum or aluminum alloy.

Claims (8)

  1. A process for making a fluid flow tube with a varying cross section comprising extruding a tube with a constant cross section, positioning the extruded tube in a die having substantially the cross section of the outer wall of the end tube and increasing the pressure inside the extruded tube, thereby deforming the tube, so that its outer wall confirms to the die form.
  2. A process according to claim 1, wherein the tube is heated at least during deformation.
  3. A process according to claim 1 or 2, wherein the extended tube is provided with at least an internal partition wall defining several flowing channels with the tube, and that at the locations where the extruded tube is expanded said wall is broken.
  4. A process according to claim 3, wherein the internal wall is provided with a portion with smaller cross section.
  5. A process according to claim 4, wherein said portion with smaller cross is a portion provided with notch-like saving or savings.
  6. A process according to any one of claims 3 - 5, wherein the extruded tube is a multiport extruded tube.
  7. A process according to any one of claims 1 - 6, wherein the extruded tube is made of aluminum or aluminium alloy.
  8. Heat exchanger comprising a tube like part having at least one portion with enlarged cross section, to be used e.g. as suction accumulator, condenser or the like, wherein the tube like part is obtained by a process according to any one of claims 1 - 7.
EP96200712A 1996-03-14 1996-03-14 Process of making a fluid flow tube with varying cross section Withdrawn EP0795365A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96200712A EP0795365A1 (en) 1996-03-14 1996-03-14 Process of making a fluid flow tube with varying cross section

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96200712A EP0795365A1 (en) 1996-03-14 1996-03-14 Process of making a fluid flow tube with varying cross section

Publications (1)

Publication Number Publication Date
EP0795365A1 true EP0795365A1 (en) 1997-09-17

Family

ID=8223784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96200712A Withdrawn EP0795365A1 (en) 1996-03-14 1996-03-14 Process of making a fluid flow tube with varying cross section

Country Status (1)

Country Link
EP (1) EP0795365A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19909925A1 (en) * 1999-03-06 2000-09-14 Audi Ag Process for hydroforming a hollow profile
WO2001031274A1 (en) * 1999-10-27 2001-05-03 Brazeway, Inc. Micro-multiport tubing and method for making same
WO2003084692A1 (en) * 2002-04-08 2003-10-16 Norsk Hydro Asa Process for making a multiple duct distributor and distributor
BE1018266A3 (en) * 2008-08-22 2010-08-03 Atlas Copco Airpower Nv METHOD FOR MANUFACTURING A ROTOR FOR A COMPRESSOR OR A ENGINE, A TUBE APPLIED THEREOF AND A ROTOR OBTAINED WITH SUCH METHOD
US20220212152A1 (en) * 2019-05-31 2022-07-07 Young Ho Yoo Flow Path Member for Generating Nano-Bubbles, and Integrated Flow Path Unit and Nano-Bubble Generator Using Same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580324A (en) * 1984-06-22 1986-04-08 Wynn-Kiki, Inc. Method for rounding flat-oval tubing
JPH0327833A (en) * 1989-06-22 1991-02-06 Showa Alum Corp Manufacture of flat, multiple hole tube material for heat exchanger
DE4425984A1 (en) * 1994-07-22 1996-01-25 Bayerische Motoren Werke Ag Method for producing a hollow metal component

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580324A (en) * 1984-06-22 1986-04-08 Wynn-Kiki, Inc. Method for rounding flat-oval tubing
JPH0327833A (en) * 1989-06-22 1991-02-06 Showa Alum Corp Manufacture of flat, multiple hole tube material for heat exchanger
DE4425984A1 (en) * 1994-07-22 1996-01-25 Bayerische Motoren Werke Ag Method for producing a hollow metal component

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 155 (M - 1104) 18 April 1991 (1991-04-18) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19909925A1 (en) * 1999-03-06 2000-09-14 Audi Ag Process for hydroforming a hollow profile
US7024898B1 (en) 1999-03-06 2006-04-11 Audi Ag Method for hydroforming a hollow profile
WO2001031274A1 (en) * 1999-10-27 2001-05-03 Brazeway, Inc. Micro-multiport tubing and method for making same
WO2003084692A1 (en) * 2002-04-08 2003-10-16 Norsk Hydro Asa Process for making a multiple duct distributor and distributor
BE1018266A3 (en) * 2008-08-22 2010-08-03 Atlas Copco Airpower Nv METHOD FOR MANUFACTURING A ROTOR FOR A COMPRESSOR OR A ENGINE, A TUBE APPLIED THEREOF AND A ROTOR OBTAINED WITH SUCH METHOD
US20220212152A1 (en) * 2019-05-31 2022-07-07 Young Ho Yoo Flow Path Member for Generating Nano-Bubbles, and Integrated Flow Path Unit and Nano-Bubble Generator Using Same
EP3978105A4 (en) * 2019-05-31 2023-07-05 Young Ho Yoo Flow path member for generating nano-bubbles, and integrated flow path unit and nano-bubble generator using same

Similar Documents

Publication Publication Date Title
EP0637474B1 (en) Method of making a high pressure condenser
US4688311A (en) Method of making a heat exchanger
EP0654645B1 (en) Heat exchanger
EP1438545B1 (en) Finned tube for heat exchangers, heat exchanger, process for producing heat exchanger finned tube, and process for fabricating heat exchanger
US5311661A (en) Method of pointing and corrugating heat exchange tubing
EP0646231B1 (en) Heat exchange tubes
JPS61125593A (en) Heat exchanger and manufacture and device thereof
US6325141B2 (en) Tube
US5381600A (en) Heat exchanger and method of making the same
US3433300A (en) Heat exchangers and the method of making same
US7165326B2 (en) Heat exchanger and process for fabricating same
EP1213555A1 (en) Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube
EP0795365A1 (en) Process of making a fluid flow tube with varying cross section
EP0757928B1 (en) A method for the manufacture of a heat exchanger, particularly for the manufacture of a condenser for vehicle air-conditioning systems
HU212748B (en) Method of making evaporator for compressor-type refrigerating machine
US20020121120A1 (en) Method and apparatus for manufacturing extruded parts
US3546763A (en) Heat exchangers and the method of making same
JP2018124034A (en) Tube for heat exchanger
US2999304A (en) Method of manufacturing heat exchangers
EP0574645B1 (en) A method for fixing heat exchange elements to an end plate and a tool for conforming to a circular cross-section the end of a tube of oblong cross-section
EP0906796A1 (en) Process for making a heat exchanger
JPH08267123A (en) Extrusion die
JPH11221639A (en) Tube for heat exchanger and its production
WO2002053303A1 (en) Method and apparatus for manufacturing extruded parts
JP3973271B2 (en) Liquid receiver integrated refrigerant condenser and method for manufacturing the same

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

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19980220