EP0353462A1 - Pistons, en particulier pistons plongeurs pour compresseurs - Google Patents

Pistons, en particulier pistons plongeurs pour compresseurs Download PDF

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Publication number
EP0353462A1
EP0353462A1 EP89111923A EP89111923A EP0353462A1 EP 0353462 A1 EP0353462 A1 EP 0353462A1 EP 89111923 A EP89111923 A EP 89111923A EP 89111923 A EP89111923 A EP 89111923A EP 0353462 A1 EP0353462 A1 EP 0353462A1
Authority
EP
European Patent Office
Prior art keywords
piston
guide ring
piston body
filled
piston according
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Withdrawn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
EP89111923A
Other languages
German (de)
English (en)
Inventor
Rolf Haldenwang
Jakob Brandtner
Walter Schuhmacher
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.)
Elring Dichtungswerke GmbH
Original Assignee
Elring Dichtungswerke GmbH
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 Elring Dichtungswerke GmbH filed Critical Elring Dichtungswerke GmbH
Publication of EP0353462A1 publication Critical patent/EP0353462A1/fr
Withdrawn legal-status Critical Current

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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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a piston, in particular a plunger for compressors, with a cylindrical piston body, with a sealing ring arranged on the outer circumference of the piston body and with a guide support likewise applied to the outer circumference of the piston body.
  • Known pistons of this type are primarily used in dry running, i.e. H. Without lubrication, used in plunger compressors to compress air or technical gases.
  • the known pistons consist of metal, in particular aluminum alloy, and are usually produced by injection molding, which means that the pistons generally still have to be reworked.
  • Sealing and guide rings in particular made of polytetrafluoroethylene (PTFE), are inserted in more or less wide circumferential grooves of the piston.
  • the guide rings can only cover approx. 80 - 90% of the available piston length, they have a thickness of approx. 3 mm and are usually slotted (in order to be able to apply them to the piston), so that a butt joint is created when assembled.
  • the object is achieved according to the invention in a generic piston in that the piston body consists of thermosetting plastic and the guide support is connected as a self-contained, seamless guide ring to the plastic of the piston body.
  • the guide ring extends essentially over the entire length of the piston body, and the guide ring has a wall thickness between 0.2 and 1 mm.
  • the plunger shown in Figure 1 which is particularly suitable as a plunger in a compressor, consists of a cup-shaped, one-sided closed piston body 1 (also called “piston shirt").
  • a bore 2 extending transversely to the axis of the piston serves to receive a conventional piston pin for fastening a connecting rod or the like.
  • a piston sealing ring 3 made of polytetrafluoroethylene (PTFE) is inserted in a manner known per se.
  • the piston body 1 is covered practically over the entire remaining length by a sleeve-shaped guide support made of PTFE, which forms the guide ring 4 of the piston.
  • the guide ring 4 is self-contained and seamless.
  • the wall thickness of the guide ring 4 is approximately 0.5 mm, it can generally be between 0.2 and 1 mm.
  • the piston body 1 consists of a thermosetting plastic, for example phenolic resin, melamine resin, urea resin, epoxy resin or polyester resin.
  • the small wall thickness of the guide ring causes very little thermal expansion, i. H. Cold and warm play can be significantly reduced compared to the known metal pistons with a thicker guide ring. This significantly improves the smooth running of the piston. Since the guide ring 4 is seamless, it also contributes to the sealing of the piston in its cylinder. Overall, the life of the piston is also increased by the guide ring 4, which covers practically the entire length of the piston.
  • the piston according to Figure 1 is advantageously in the following manner Manufactured in one operation: a section is cut from a PTFE hose or a PTFE tube and inserted into a conventional injection, compression or injection molding tool. This section has the shape of a sleeve and later forms the guide ring 4 on the finished piston. A thermoset granulate is filled or injected into the section. Instead of granules, pre-pressed tablets or pre-plastified thermoset blanks can also be filled.
  • the tool which was initially open, is now closed, whereupon a high-temperature-resistant and stable connection between the PTFE material of the guide ring 4 and the thermoset piston body which is formed is produced under high pressure (100-1000 bar) and high temperature (100-200 ° C) .
  • the finished piston provided with the guide ring 4 is then removed from the tool.
  • the pressing or injection molds can be designed so that machining of the piston is no longer necessary after removal from the mold. To achieve higher dimensional accuracy, however, machining of the piston body can also be carried out.
  • the embodiment of a piston according to FIG. 2 differs from that according to FIG. 1 essentially in that, in order to reduce the heat transfer through the piston, in addition to the guide ring 4, a temperature insulation layer 5 made of PTFE is applied to the end face of the piston body 1, specifically because of this that this layer in the form of a circular plate is also inserted into the mold of the piston.
  • FIG. 4 shows a further embodiment of a plunger, which largely corresponds to the embodiment according to FIG. 1.
  • the piston body 1 has an opening 7 on its end wall, which, as shown only schematically, is closed by a valve plate 8.
  • the elastic valve plate 8 opens, so that the medium to be compressed is sucked through the piston body 1.
  • the piston body is cooled by the inflowing medium.
  • a special intake valve is saved in the cylinder.
  • the valve plate 8 can also be inserted into the mold before the piston is manufactured.
  • the thermosetting plastic forming the piston body 1 can be filled with additives. Glass, carbon and / or mineral fibers are particularly suitable for this.
  • the guide ring 4 can also be made from a thermoplastic other than PTFE, in particular from polyether ether ketone (PEEK) or from polyether ketone (PEK).
  • PEEK polyether ether ketone
  • PEK polyether ketone
  • the thermoplastic material forming the guide ring 4 can also be filled with additives, preferably with glass, carbon and / or mineral fibers.
  • the specific surface pressure of the guide ring is reduced due to the transverse forces that occur due to the enlarged piston guide surface.
  • This increases the service life or service life of the piston.
  • the sleeve-shaped guide ring 4 can, for example, by the spraying or pressing method described, High temperature resistant and permanent connection to the thermoset piston body. This increases operational reliability.
  • the manufacturing process described can be carried out in a simple manner inexpensively and for large quantities.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressor (AREA)
EP89111923A 1988-07-21 1989-06-30 Pistons, en particulier pistons plongeurs pour compresseurs Withdrawn EP0353462A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883824780 DE3824780A1 (de) 1988-07-21 1988-07-21 Kolben, insbesondere tauchkolben fuer kompressoren
DE3824780 1988-07-21

Publications (1)

Publication Number Publication Date
EP0353462A1 true EP0353462A1 (fr) 1990-02-07

Family

ID=6359218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89111923A Withdrawn EP0353462A1 (fr) 1988-07-21 1989-06-30 Pistons, en particulier pistons plongeurs pour compresseurs

Country Status (2)

Country Link
EP (1) EP0353462A1 (fr)
DE (1) DE3824780A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550810A2 (fr) * 1991-11-08 1993-07-14 ALMATEC Technische Innovationen GmbH Pompe à membrane double
EP1176310A2 (fr) * 2000-07-26 2002-01-30 Kabushiki Kaisha Toyota Jidoshokki Revêtement de compresseur PEEK
EP2161451A1 (fr) * 2008-09-09 2010-03-10 HAUG Kompressoren AG Compresseur à piston
WO2010097283A3 (fr) * 2009-02-26 2010-12-23 Nordson Corporation Dispositif et procédé de distribution de matériaux coulants, en particulier d'injection de matériaux très visqueux entre des pièces
WO2014053211A1 (fr) * 2012-10-06 2014-04-10 Wabco Gmbh Procédé de fabrication d'un piston destiné à une machine de travail à piston alternatif, piston fabriqué selon ledit procédé ainsi que machine de travail à piston alternatif comportant au moins un piston fabriqué selon ledit procédé
ITFI20130296A1 (it) * 2013-12-09 2015-06-10 Nuovo Pignone Srl "reciprocating compressor with composite material components"
US9739318B2 (en) 2015-05-20 2017-08-22 Federal-Mogul Llc Clutch piston assembly

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19502926A1 (de) * 1995-01-31 1996-08-01 Teves Gmbh Alfred Kolben für einen Geberzylinder und Verfahren zur Herstellung eines derartigen Kolbens
DE19518875A1 (de) * 1995-05-23 1996-11-28 Lothar Wanzke Kolben mit Pleuelstange
DE10116658B4 (de) * 2001-04-04 2005-08-11 Robert Bosch Gmbh Verfahren und Herstellung eines Führungs- oder Lagerrings und Maschinenteil mit einem derartigen Ring
DE102009017609A1 (de) * 2009-04-08 2010-10-21 Golle Motor Ag Schmierölfreie Kolben/Zylinder-Gruppe für Kolbenmaschinen
CN105275592A (zh) * 2014-07-18 2016-01-27 王耀庭 汽油机增压器电控泄压阀滑动密封罩的密封圈的制造方法
DE102014224237A1 (de) * 2014-11-27 2016-06-02 Elringklinger Ag Kolben, Kolbenvorrichtung und Verfahren zur Herstellung eines Kolbens
DE102014224235A1 (de) * 2014-11-27 2016-06-02 Elringklinger Ag Kolben, Kolbenvorrichtung und Verfahren zur Herstellung eines Kolbens

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1873878A (en) * 1928-08-21 1932-08-23 Doherty Res Co High temperature adiabatic compressor
US2410405A (en) * 1945-01-01 1946-11-05 Richard T Cornelius Piston
US2911270A (en) * 1957-05-31 1959-11-03 Charles S White Flexible low friction piston
DE1234378B (de) * 1956-05-09 1967-02-16 Charles Samuel White Verfahren zur Herstellung von gegeneinander bewegbaren Maschinenbauteilen
GB1413114A (en) * 1971-12-11 1975-11-05 Hepworth & Grandage Ltd Reciprocating compressors or pumps
DE2510957A1 (de) * 1975-03-13 1976-09-23 Danfoss As Kolbenanordnung mit kugelkopfgelenk
FR2361555A1 (fr) * 1976-07-15 1978-03-10 Compair Ind Ltd Perfectionnements aux compresseurs a pistons
JPS61236968A (ja) * 1985-04-12 1986-10-22 Hitachi Ltd ピストン

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464323A (en) * 1967-09-12 1969-09-02 John L Saksun Piston
CH639736A5 (de) * 1979-03-15 1983-11-30 Haug Fritz Ag Verfahren und giessvorrichtung zum anbringen einer waermedaemmenden schicht am kolbenboden des kolbens einer kolbenmaschine.
DE2914624C2 (de) * 1979-04-11 1986-06-19 Robert Bosch Gmbh, 7000 Stuttgart Druckmittelbetätigter Arbeitszylinder
US4306489A (en) * 1979-11-01 1981-12-22 Exxon Research & Engineering Co. Composite piston
DD213261A1 (de) * 1983-01-18 1984-09-05 Leuna Werke Veb Verfahren zur regenerierung abgenutzter bzw. verschlissener kolben

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1873878A (en) * 1928-08-21 1932-08-23 Doherty Res Co High temperature adiabatic compressor
US2410405A (en) * 1945-01-01 1946-11-05 Richard T Cornelius Piston
DE1234378B (de) * 1956-05-09 1967-02-16 Charles Samuel White Verfahren zur Herstellung von gegeneinander bewegbaren Maschinenbauteilen
US2911270A (en) * 1957-05-31 1959-11-03 Charles S White Flexible low friction piston
GB1413114A (en) * 1971-12-11 1975-11-05 Hepworth & Grandage Ltd Reciprocating compressors or pumps
DE2510957A1 (de) * 1975-03-13 1976-09-23 Danfoss As Kolbenanordnung mit kugelkopfgelenk
FR2361555A1 (fr) * 1976-07-15 1978-03-10 Compair Ind Ltd Perfectionnements aux compresseurs a pistons
JPS61236968A (ja) * 1985-04-12 1986-10-22 Hitachi Ltd ピストン

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 82 (M-571)[2529], 12. März 1987; & JP-A-61 236 968 (HITACHI LTD) 22-10-1986 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0550810A2 (fr) * 1991-11-08 1993-07-14 ALMATEC Technische Innovationen GmbH Pompe à membrane double
EP0550810A3 (fr) * 1991-11-08 1994-03-23 Almatec Tech Innovationen Gmbh
EP1176310A2 (fr) * 2000-07-26 2002-01-30 Kabushiki Kaisha Toyota Jidoshokki Revêtement de compresseur PEEK
EP1176310A3 (fr) * 2000-07-26 2004-05-12 Kabushiki Kaisha Toyota Jidoshokki Revêtement de compresseur PEEK
EP2161451A1 (fr) * 2008-09-09 2010-03-10 HAUG Kompressoren AG Compresseur à piston
WO2010097283A3 (fr) * 2009-02-26 2010-12-23 Nordson Corporation Dispositif et procédé de distribution de matériaux coulants, en particulier d'injection de matériaux très visqueux entre des pièces
WO2014053211A1 (fr) * 2012-10-06 2014-04-10 Wabco Gmbh Procédé de fabrication d'un piston destiné à une machine de travail à piston alternatif, piston fabriqué selon ledit procédé ainsi que machine de travail à piston alternatif comportant au moins un piston fabriqué selon ledit procédé
US10040229B2 (en) 2012-10-06 2018-08-07 Wabco Gmbh Method for producing a piston
ITFI20130296A1 (it) * 2013-12-09 2015-06-10 Nuovo Pignone Srl "reciprocating compressor with composite material components"
WO2015086458A1 (fr) * 2013-12-09 2015-06-18 Nuovo Pignone Srl Compresseur alternatif à composants en matériau composite
US9739318B2 (en) 2015-05-20 2017-08-22 Federal-Mogul Llc Clutch piston assembly

Also Published As

Publication number Publication date
DE3824780A1 (de) 1990-01-25
DE3824780C2 (fr) 1993-06-24

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