EP0252296B1 - Kolbenpumpe zur Förderung einer kryogenen Flüssigkeit - Google Patents

Kolbenpumpe zur Förderung einer kryogenen Flüssigkeit Download PDF

Info

Publication number
EP0252296B1
EP0252296B1 EP87108051A EP87108051A EP0252296B1 EP 0252296 B1 EP0252296 B1 EP 0252296B1 EP 87108051 A EP87108051 A EP 87108051A EP 87108051 A EP87108051 A EP 87108051A EP 0252296 B1 EP0252296 B1 EP 0252296B1
Authority
EP
European Patent Office
Prior art keywords
piston
core
thermal expansion
piston pump
bearing ring
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.)
Expired
Application number
EP87108051A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0252296A2 (de
EP0252296A3 (en
Inventor
Gottfried Schneider
Walter Prof. Dr.-Ing. Peschka
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.)
Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Deutsches Zentrum fuer Luft und Raumfahrt eV
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 Deutsches Zentrum fuer Luft und Raumfahrt eV filed Critical Deutsches Zentrum fuer Luft und Raumfahrt eV
Publication of EP0252296A2 publication Critical patent/EP0252296A2/de
Publication of EP0252296A3 publication Critical patent/EP0252296A3/de
Application granted granted Critical
Publication of EP0252296B1 publication Critical patent/EP0252296B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/931—Seal including temperature responsive feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/901—Cryogenic pumps

Definitions

  • the invention relates to a piston pump for delivering a cryogenic liquid with a pump cylinder made of a material with low thermal expansion and with a piston displaceable therein, on the peripheral surface of which piston rings made of a self-lubricating material are held, which has a greater thermal expansion than the material of the pump cylinder.
  • Piston pumps for pumping cryogenic liquids result in a number of problems due to the boiling state of the cryogenic liquids, their low temperatures and their low kinematic viscosity.
  • the low temperatures cause a very restricted choice of materials, there are shrinkage problems in particular with the piston-cylinder pairing, and the use of additive lubricants is not possible.
  • the user has to rely on self-lubricating piston-cylinder surfaces, usually sealing by means of piston rings on the pistons with self-lubricating properties, for example with piston rings made of PTFE, PTFE-carbon, PTFE-graphite or PTFE- Bronze.
  • a piston pump of the type described in the introduction in that the piston has a core made of a material with relatively high thermal expansion, which is surrounded by a sleeve made of a material with low thermal expansion, that the core protrudes from the sleeve on both sides and has conically widening expansion regions towards its free ends and that the piston rings surround the core in the expansion regions and are supported on the end faces of the sleeve.
  • the core of the piston contracts more strongly than the surrounding sleeve during cooling in the axial direction, so that the piston rings are displaced in the axial direction into regions of larger diameter during cooling on the conical expansion regions of the core.
  • the dimensions can be chosen so that this expansion of the piston rings through the expansion areas of the core compensates for the shrinkage of the piston rings to such an extent that the resulting shrinkage of the piston rings corresponds to the shrinkage of the pump cylinder dimensions.
  • the piston rings bear directly against the conical extensions of the core, that is to say they shift in the axial direction on cooling on the core.
  • the core consists of two parts connected to one another inside the sleeve; this simplifies the assembly of the piston.
  • the expansion areas of the core are surrounded by a bearing ring which is divided into segments by radial incisions, so that the bearing ring can expand in the radial direction in the event of an axial displacement on the conical expansion area, so that the Bearing ring is supported on the end face of the sleeve and that the piston ring surrounds the bearing ring and is held on it.
  • the bearing ring is thus initially expanded upon cooling, which then transmits its expansion to the piston ring surrounding it.
  • the bearing ring rests with a conical surface on the conical surface of the expansion area of the core, the cones is essentially the same in both cases.
  • the expansion area of the core is plugged onto the core at least at one end and can be detached therewith. This also facilitates the assembly of the piston.
  • the expansion areas preferably have axially projecting flanges which serve as an axial stop for the piston ring.
  • the piston 1 of the exemplary embodiment shown in FIGS. 1 and 2 comprises an elongated, rotationally symmetrical core which essentially consists of a cylindrical shaft 3 and an expansion region 5 which widens conically at one end 4.
  • the expansion area 5 is delimited by a radially projecting flange 6.
  • a receiving opening 7 for inserting a hexagon key is machined into the end face of the core 2.
  • the shaft is provided with an external thread 9 and screwed into a coupling piece 10, which rod 11 is connected to an oscillating driven stroke and train.
  • the shaft 3 is fixed in the coupling piece by a grub screw 12 screwed radially into the coupling piece 10.
  • a first bearing ring 13, a spacer sleeve 14, a second bearing ring 15 and an expansion part 16 are placed one after the other on the core 2; these parts are fixed on the core by a nut 17 screwed onto the external thread 9.
  • the two bearing rings 13, 15 have conically widening inner surfaces 18, the taper of which essentially corresponds to the taper of the expansion region 5 or of the expansion part 16.
  • the inner surfaces 18 lie flat against the expansion area 5 or the expansion part 16.
  • Both bearing rings each have radial incisions 19 offset by 120 ° in the circumferential direction (FIG. 2), so that the bearing rings 13 and 15 can be expanded or compressed in the radial direction in the manner of collets.
  • the circumferential surfaces 22 and 23 of the bearing rings 13 and 15 are circular cylindrical, they end on the mutually facing side of the two bearing rings in a radially outwardly projecting annular shoulder 20 and 21, respectively.
  • the circumference of the circumferential surface 22 is smaller than the circumference of the flange 6 of core 2.
  • the expansion part 16 is designed as a ring with a conically widening contact surface 24 which ends in a flange 25 which projects radially outwards.
  • the circumference of the flange 25 is larger than the circumference of the circumferential surface 23 of the bearing ring 15.
  • Both bearing rings 13 and 15 dip into the spacer sleeve 14, the ring shoulders 20 and 21 of the two bearing rings are supported on the end faces 26 and 27 of the spacer sleeve 14.
  • a piston ring 28 and 29 is mounted, which also encompasses the flange 6 and the flange 25, respectively.
  • Both piston rings have a recess on the inside in the area of these flanges, so that the piston rings are fixed in the axial direction in the area between the flanges 6 and 25 on the one hand and the ring shoulders 20 and 21 on the other hand.
  • the outer surfaces 30 and 31 of the two piston rings 28 and 29 are circular cylindrical and lie sealingly on the inner wall of a pump cylinder 32 shown in dash-dotted lines in the drawing.
  • the choice of material is such that the spacer sleeve has the smallest thermal expansion, the piston rings the greatest thermal expansion and the core has thermal expansion between that of the spacer sleeve and that of the piston rings.
  • the piston rings are made, for example, of PTFE, PTFE carbon, PTFE graphite, PTFE bronze or brass, the spacer sleeve made of Fe Ni 36 steel (In 36), the core made of austenitic cold-tough steel, aluminum, titanium or bronze.
  • the core 2 contracts more strongly than the spacer sleeve 14 when cooling in the axial direction, so that the expansion area 5 and the expansion part 16 of the core 2 when cooling into the bearing rings 13 and 15 pulls in and thereby expands them. At the same time, this also leads to an expansion of the piston rings 28 and 29 resting on the bearing rings.
  • the piston shown in FIGS. 1 and 2 can be assembled in a simple manner. For this it is sufficient to place the bearing ring 13 with the piston ring 28 thereon, the spacer sleeve 14, the bearing ring 15 with the piston ring 29 thereon and the expansion part 16 on the core 2 in succession and then to fix these parts with the nut 17 on the core 2 .
  • the piston assembled in this way can then be screwed into the coupling piece 10 and fixed there.
  • FIGS. 3 and 4 corresponding parts are designated by the same reference numerals.
  • the pump cylinder is not shown in the drawing.
  • the core 2 in this embodiment consists of two parts 40, 41, which have a threaded bore 42 or a threaded pin 43 in the interior of the surrounding spacer sleeve 14, so that the two parts can be screwed together.
  • Both parts 40 and 41 have, at their ends 4 protruding from the spacer sleeve 14, a conically widening widening area 44 or 45, widening area 44 corresponding to widening area 5 in the exemplary embodiment in FIGS. 1 and 2.
  • the two piston rings 28 and 29 are fitted directly onto the expansion regions 44 and 45, so that the bearing rings 13 and 15 are missing in this exemplary embodiment.
  • Both piston rings 28 and 29 are supported with the mutually facing side surfaces 46 and 47 on the end surfaces 26 and 27 of the spacer sleeve 14.
  • the core 2 When cooling, the core 2 shortens in the axial direction more than the spacer sleeve 14, so that the piston rings 28 and 29 are moved to the ends of the core 2 and thereby widened.
  • an exact adaptation of the circumference of the outer surfaces 30 and 31 to the pump cylinder can be achieved by suitable dimensions and a suitable combination of the thermal expansion coefficients.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP87108051A 1986-06-28 1987-06-04 Kolbenpumpe zur Förderung einer kryogenen Flüssigkeit Expired EP0252296B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863621726 DE3621726A1 (de) 1986-06-28 1986-06-28 Kolbenpumpe zur foerderung einer kryogenen fluessigkeit
DE3621726 1986-06-28

Publications (3)

Publication Number Publication Date
EP0252296A2 EP0252296A2 (de) 1988-01-13
EP0252296A3 EP0252296A3 (en) 1988-08-03
EP0252296B1 true EP0252296B1 (de) 1989-11-15

Family

ID=6303928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108051A Expired EP0252296B1 (de) 1986-06-28 1987-06-04 Kolbenpumpe zur Förderung einer kryogenen Flüssigkeit

Country Status (4)

Country Link
US (1) US4813342A (enrdf_load_stackoverflow)
EP (1) EP0252296B1 (enrdf_load_stackoverflow)
JP (1) JPH0786349B2 (enrdf_load_stackoverflow)
DE (1) DE3621726A1 (enrdf_load_stackoverflow)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343798A (en) * 1992-09-15 1994-09-06 Fastest Inc. Apparatus for gripping and sealing a fluid conduit
US5401406A (en) * 1992-12-11 1995-03-28 Pall Corporation Filter assembly having a filter element and a sealing device
US5628517A (en) * 1993-06-01 1997-05-13 Florida Atlantic University Contracting/expanding self-sealing cryogenic tube seals
CH688919A5 (de) * 1994-04-13 1998-05-29 Cryomec Ag Triebwerk einer Kolbenpumpe für cryogene Anwendungen.
US6056520A (en) * 1995-12-04 2000-05-02 Chemical Seal & Packing, Inc. Magnetic drive pump having encased magnets for pumping very low temperature fluids
US6558139B2 (en) 1995-12-04 2003-05-06 Chemical Seal & Packing, Inc. Bearings with hardened rolling elements and polymeric cages for use submerged in very low temperature fluids
DE69919658T2 (de) * 1998-05-26 2005-09-15 Caterpillar Inc., Peoria Hydrauliksystem mit einer pumpe mit variabler fördermenge
SE517883C2 (sv) * 1998-06-08 2002-07-30 Toyoda Automatic Loom Works Sätt att tillverka en rotorenhet, rotorenhet för uppvärmning av en viskösfluid samt värmealstrare innefattande en dylik rotorenhet
DE19915847A1 (de) * 1999-04-08 2000-10-12 Linde Tech Gase Gmbh Pumpensystem zum Fördern von kryogenen Flüssigkeiten
US6779987B2 (en) * 2000-08-14 2004-08-24 Devilbiss Air Power Company Pressure washer having oilless high pressure pump
US6397729B1 (en) * 2000-08-14 2002-06-04 Devilbiss Air Power Company High pressure pump having bearing assembly pre-load apparatus
US6547250B1 (en) 2000-08-21 2003-04-15 Westport Research Inc. Seal assembly with two sealing mechanisms for providing static and dynamic sealing
US6685193B2 (en) 2001-08-30 2004-02-03 Illinois Tool Works Inc. Self lubricating, non-sealing piston ring for an internal combustion fastener driving tool
US6773017B2 (en) 2002-07-16 2004-08-10 Pittsburgh Cryogenic Services, Inc. Single-piece seal assembly
US20090116979A1 (en) * 2004-06-08 2009-05-07 Grigori Lishanski Piston vibratory pump
US8147226B2 (en) * 2006-02-01 2012-04-03 Black & Decker Inc. Valve assembly for pressure washer pump
US10036383B2 (en) 2015-04-07 2018-07-31 Caterpillar Inc. Pump piston having variable diameter
JP7512017B2 (ja) 2019-04-26 2024-07-08 株式会社神戸製鋼所 ピストンリング、往復動圧縮機及びピストンリングの選定方法

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1657478A (en) * 1928-01-31 Assig-nob
US1054345A (en) * 1911-08-11 1913-02-25 Martin J Whelan Piston.
US1520173A (en) * 1923-08-07 1924-12-23 John D Carr Pump plunger
DE854611C (de) * 1942-04-07 1952-11-06 Trier Bros Kolben, insbesondere Tauchkolben mit nachgiebig nach aussen gedrueckten Kolbenringen
GB681498A (en) * 1950-09-08 1952-10-22 Armstrong Siddeley Motors Ltd Sliding seals for liquid oxygen or the like
US2632678A (en) * 1950-09-08 1953-03-24 Armstrong Siddeley Motors Ltd Sliding seal for liquid oxygen or the like
US3015529A (en) * 1959-11-23 1962-01-02 Cardwell Mfg Company Pump plunger construction
US3352213A (en) * 1965-02-17 1967-11-14 Raymond J Karol Expansible reciprocating piston
US3612545A (en) * 1968-06-10 1971-10-12 Duriron Co Restrainer ring seal assembly
GB1324080A (en) * 1969-12-15 1973-07-18 Ici Ltd Pistons
GB1367199A (en) * 1971-06-01 1974-09-18 Uss Eng & Consult Pump piston
US3999768A (en) * 1972-11-01 1976-12-28 Jepsen Robert E Piston ring
US4044655A (en) * 1975-10-01 1977-08-30 Kennametal Inc. High pressure plunger and method of manufacture
US4156584A (en) * 1976-07-19 1979-05-29 Carpenter Technology Corporation Liquid cryogen pump
SE408324B (sv) * 1976-10-15 1979-06-05 Sandvik Ab Kolv foretredesvis for hogtryckskompressorer
US4226169A (en) * 1978-06-05 1980-10-07 The United States Of America As Represented By The United States Department Of Energy Adjustable expandable cryogenic piston and ring
JPS5756678A (en) * 1980-09-19 1982-04-05 Furusawa Shoichi Piston device of reciprocating pump for super low temperature liquefied gas
US4396362A (en) * 1980-10-31 1983-08-02 Union Carbide Corporation Cryogenic reciprocating pump
JPS584780U (ja) * 1981-07-02 1983-01-12 株式会社丸山製作所 往復動ポンプのプランジヤ
US4447195A (en) * 1982-02-22 1984-05-08 Air Products And Chemicals, Inc. High pressure helium pump for liquid or supercritical gas
US4578956A (en) * 1983-01-17 1986-04-01 Helix Technology Corporation Cryogenic refrigeration system with linear drive motors

Also Published As

Publication number Publication date
DE3621726A1 (de) 1988-01-14
US4813342A (en) 1989-03-21
JPS6325380A (ja) 1988-02-02
DE3621726C2 (enrdf_load_stackoverflow) 1988-12-08
JPH0786349B2 (ja) 1995-09-20
EP0252296A2 (de) 1988-01-13
EP0252296A3 (en) 1988-08-03

Similar Documents

Publication Publication Date Title
EP0252296B1 (de) Kolbenpumpe zur Förderung einer kryogenen Flüssigkeit
DE3790492C2 (de) Spann- und Haltevorrichtung sowie Dichtungsvorrichtung
EP0832381B1 (de) Dichtungsringscheibe für eine kolbenstange
DE69216943T2 (de) Drehbare Rohrverbindung mit verbesserter Dichtung
DE3707046C2 (enrdf_load_stackoverflow)
DE3002715C2 (de) Dichtungsanordnung
CH660407A5 (de) Dichtring fuer kolbenstangen.
EP2912351B1 (de) Kolbenring
DE3817172A1 (de) Dichtung fuer einen kugelgewindetrieb
EP0953113A1 (de) Hubkolbenkompressor
DE3812627A1 (de) Dichtungsvorrichtung fuer eine pumpe
EP0380749B1 (de) Gleitringdichtung
EP1110017A1 (de) REIBUNGSARME DICHTUNG und hydraulikzylinder
DE3007858A1 (de) Rollbalg-luftfeder und verfahren zu ihrem zusammenbau
DE2931603A1 (de) Dichtung
DE8432062U1 (de) Steckverbindung für Leitungsrohre zum Transport von tiefgekühlten Medien
DE2943711A1 (de) Lagerung, bestehend aus einem lagerinnenring, einem lageraussenring und einem lagergehaeuse
DE69208034T2 (de) Abdichtung
DE60017142T2 (de) Dichtungsanordnung und dichtungselement dafür
DE3632490A1 (de) Waermeisolierende trageinrichtung
EP3093537B1 (de) Abstreifanordnung und abdichtvorrichtung
EP4118365A1 (de) Kolbenringanordnung, kolbenverdichter sowie verfarhen zum abdichten eines verdichtungsraums
DE19855795B4 (de) Schneidringverschraubung für Druckmittel-Rohrleitungen
DE2628985A1 (de) Zylinder-kolbenanordnung fuer eine fluessigkeitspumpe
DE2652346C3 (enrdf_load_stackoverflow)

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: A2

Designated state(s): FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RHK1 Main classification (correction)

Ipc: F04B 15/08

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): FR GB IT SE

17P Request for examination filed

Effective date: 19880826

17Q First examination report despatched

Effective date: 19890224

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): FR GB IT SE

ITF It: translation for a ep patent filed
RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHR

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHR

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

ITTA It: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 87108051.1

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19990607

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990616

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19990621

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000604

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000605

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20000604

EUG Se: european patent has lapsed

Ref document number: 87108051.1

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050604