EP0725898A1 - Piston pour compresseur a piston de milieux gazeux - Google Patents

Piston pour compresseur a piston de milieux gazeux

Info

Publication number
EP0725898A1
EP0725898A1 EP95929853A EP95929853A EP0725898A1 EP 0725898 A1 EP0725898 A1 EP 0725898A1 EP 95929853 A EP95929853 A EP 95929853A EP 95929853 A EP95929853 A EP 95929853A EP 0725898 A1 EP0725898 A1 EP 0725898A1
Authority
EP
European Patent Office
Prior art keywords
piston
annular groove
head
piston head
passage
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.)
Granted
Application number
EP95929853A
Other languages
German (de)
English (en)
Other versions
EP0725898B1 (fr
Inventor
Helmut Thurner
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.)
Magna BDW Technologies GmbH
Original Assignee
Bayerisches Druckgusswerk Thurner KG
Magna BDW Technologies 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 Bayerisches Druckgusswerk Thurner KG, Magna BDW Technologies GmbH filed Critical Bayerisches Druckgusswerk Thurner KG
Publication of EP0725898A1 publication Critical patent/EP0725898A1/fr
Application granted granted Critical
Publication of EP0725898B1 publication Critical patent/EP0725898B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F04B39/10—Adaptations or arrangements of distribution members
    • 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
    • F04B39/0016—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 with valve arranged in the piston
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • 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]

Definitions

  • the present invention relates to a piston compressor for gaseous media, in particular an air piston compressor driven by an electric motor according to the preamble of claim 1.
  • a piston compressor for gaseous media
  • Such a compressor is described in DE-GM 17 48 885 or DE 36 16 968 AI.
  • DE-GM describes a piston for suction and pressure pumps, which is made entirely of plastic and the lateral surfaces of which are tapered in the suction direction.
  • the valve cover has sealing knobs that fit into openings when the closed state is reached.
  • the task is to make a small piston compressor with high performance available which It is possible to provide high volume flows within a short time. Since the electrical energy for the drive is to be taken from the electrical system of a motor vehicle, the drive power is limited. Therefore, particularly good efficiency is required. This in turn requires operation at a low temperature level.
  • DE 23 11 048 AI describes a small unit that is used as a structural unit in motor vehicles in order to provide compressed air for various purposes, and to a large extent such compressed air that does not necessarily have one - as with compressed air brakes Compressed air reservoir is led, but with which work is also carried out during production, for example driving any units such as windshield wipers or the like, or being introduced into a system of air suspension.
  • air pressure accumulators can also be filled.
  • the task is to make a piston available for a high-performance compressor which maintains its piston and valve properties even in continuous operation.
  • the solution to this problem results from the combination of the characteristics of the main claim.
  • the piston head has an annular groove formed radially on the outside, which is intended for receiving a helically wound spring.
  • the outer part of the piston head is pressed elastically against the cylinder wall. It is therefore possible to dispense with piston rings and lubrication.
  • This helical spring ensures that the outer surface, which is made of plastic, lies evenly against the cylinder inner wall
  • the pressure of the gas building up on the top of the piston also occurs within the annular groove Effect and supports the radially outward tension by the coil spring.
  • the coil spring can be supported by a flat metal ring underneath, which, as a metal insert in the plastic, limits its radial expansion, keeps the dimensions and design of the piston small and thus contributes to the reduction of the harmful space.
  • the annular groove defines a thin-walled sealing lip with which the piston head rests on the cylinder wall.
  • the sealing lip existing radially outside the annular groove allows the piston to grow as a result of the thermal heating, that is to say it expands radially with respect to the cylinder wall. Since the sealing lip is elastically stretched against the cylinder wall by the helical spring, the piston head main mass can also move relative to the sealing lip due to the free space provided by the annular groove. Since the sealing lip is thin-walled, the radial pressure developed during the upward movement of the piston can act directly. The seal on the surface between the sealing lip and the cylinder wall is best due to the radial pressure when the piston approaches top dead center, ie the gas pressure reaches its maximum value. The annular groove is slightly narrowed in this position. Such sealing lips have a wall thickness of, for example, 0.4 to 1.0 mm in piston compressors of a small construction.
  • the piston head can have a frustoconical outer surface.
  • the piston has a smaller outer diameter in its lower area than in its upper area.
  • the piston is firmly connected to the piston rod or connecting rod.
  • This connection is rigid and leads to a permanent tilting of the piston relative to the piston wall during its opening. and movement. Due to the conical design of the piston skirt, the friction surfaces of the piston remain limited to the contact surface of the upper sealing lip, so that the piston can be moved very easily and without lubrication.
  • the lower piston edge can also be provided with an annular groove and a helical spring accommodated therein in a manner comparable to the upper piston edge.
  • the annular groove is preferably formed on the upper end face of the piston head when the lateral surface is frustoconical, since the sealing requirements are greatest in this area.
  • the widest diameter of the jacket is in the region of the annular groove. Regardless of the location of the annular groove and the design of the jacket, it is advantageous to arrange the annular groove on the widest diameter of the jacket in order to achieve an effective pressure on the inner wall of the cylinder which is increased by the helical spring.
  • Fig. 1 shows a section along the section line III - III in Figure 2 by a piston according to the invention
  • FIG. 2 shows a schematic top view of the piston in the direction of arrows IV - IV according to FIG. 1.
  • the actual piston compressor with an electric motor as the drive is not shown in the drawing.
  • the electric motor has a drive shaft.
  • the shaft ends in an eccentric.
  • a connecting rod bearing 56 is located on the eccentric.
  • the connecting rod 56 carries the bearing at its lower end, which
  • the connecting rod 56 carries a piston 58 which is arranged in a cylinder for reciprocating motion.
  • the connecting rod 56 is set into a circular movement via the drive shaft which is connected to its lower head, while its upper head is reciprocated with the piston 58 in the cylinder.
  • the gas in the cylinder space is compressed until it takes up a compression space.
  • a spring-loaded outlet valve opens, so that the compressed gas is discharged via a nozzle.
  • the piston moves into its return stroke, the gas to be compressed being sucked into the crankcase via a suction opening formed in the crankcase and subsequently sucked through the piston 58 into the upper cylinder chamber.
  • the piston 58 moves into its forward stroke, the suction process coming to an end.
  • the piston 58 is designed as an intake valve without a valve spring and is fixedly connected to the connecting rod 56 by a screw 82.
  • the piston 58 is constructed in such a way that it engages a metal piston plate 72 placed directly on the connecting rod 56. points.
  • the piston plate 72 has the shape of a circular disc with a slightly conical shape.
  • In the middle there is a mounting hole 73 for a screw 82.
  • Axially to the screw 82 is a multiply graduated middle part 74.
  • An actual piston head 76 is clamped with a step 75, for the centering of the piston plate 72 a ring part 75.
  • the piston head 76 is made of plastic, preferably polytetrafluoroethylene, and has a central recess through which the central part 74 extends in the assembled position. At the front and radially outside, the piston head 76 has an annular groove 78 which is formed on its periphery in such a way that it defines a thin-walled annular sealing lip 79. A helical spring washer 77 is inserted in the annular groove 78 and clamps the sealing lip 79 radially outward. The helical spring ring 77 is supported by a likewise annular metal insert 71 made of flat metal, which at the same time serves to stiffen and thermally relieve the plastic piston.
  • Both the piston plate 72 and the plastic part 76 are provided with annular and axially aligned air passage openings 80, on which a flat metal ring 81 held by the central part 74 rests as a simple inlet valve cover.
  • the inlet valve cover 81 is movable along the central part 74, in such a way that in the rapid upward movement of the piston rod or the connecting rod 56 indicated by the arrow P u in the left-hand side of the illustration in FIG. 1, the cover 81, the opening 80 closes and compresses the air into the space above the piston 58.
  • the opposite movement of the connecting rod in the direction of arrow P d is indicated on the right side of the illustration in FIG. 1.
  • the cover 81 bears against the upper boundary of the middle part 74 and opens the opening 80. Air can flow into cylinder 60, which is compressed during the next stroke.
  • the aligned openings 80 are located within the Plastic formed piston head 76 in two ring grooves machined at the top and bottom.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP95929853A 1994-08-17 1995-08-11 Piston pour compresseur a piston de milieux gazeux Expired - Lifetime EP0725898B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4429097A DE4429097A1 (de) 1994-08-17 1994-08-17 Kolbenverdichter für gasförmige Medien
DE4429097 1994-08-17
PCT/EP1995/003196 WO1996005430A1 (fr) 1994-08-17 1995-08-11 Piston pour compresseur a piston de milieux gazeux

Publications (2)

Publication Number Publication Date
EP0725898A1 true EP0725898A1 (fr) 1996-08-14
EP0725898B1 EP0725898B1 (fr) 1998-03-04

Family

ID=6525863

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95929853A Expired - Lifetime EP0725898B1 (fr) 1994-08-17 1995-08-11 Piston pour compresseur a piston de milieux gazeux
EP95929103A Expired - Lifetime EP0725897B1 (fr) 1994-08-17 1995-08-11 Compresseur a piston pour milieux gazeux

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP95929103A Expired - Lifetime EP0725897B1 (fr) 1994-08-17 1995-08-11 Compresseur a piston pour milieux gazeux

Country Status (5)

Country Link
EP (2) EP0725898B1 (fr)
AT (2) ATE163735T1 (fr)
DE (3) DE4429097A1 (fr)
ES (2) ES2113211T3 (fr)
WO (2) WO1996005430A1 (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538339B4 (de) * 1995-10-14 2010-08-19 Voss Automotive Gmbh Vorrichtung zum Erzeugen von Druckluft
DE29717653U1 (de) * 1997-10-02 1998-11-12 Alusuisse Bayrisches Druckguß-Werk GmbH & Co. KG, 85570 Markt Schwaben Kolbenverdichter für gasförmige Medien
DE29717655U1 (de) * 1997-10-02 1998-11-12 Alusuisse Bayrisches Druckguß-Werk GmbH & Co. KG, 85570 Markt Schwaben Kolbenverdichter für gasförmige Medien
DE29717654U1 (de) * 1997-10-02 1998-11-12 Alusuisse Bayrisches Druckguß-Werk GmbH & Co. KG, 85570 Markt Schwaben Kolben für einen Kolbenverdichter
DE29814962U1 (de) * 1998-08-20 1999-11-04 Alusuisse Bayrisches Druckgus Kolben für einen Kolbenverdichter
DE19903025C2 (de) * 1999-01-26 2001-12-20 Alusuisse Bayrisches Druckgus Kolbenverdichter für gasförmige Medien
DE19916993C1 (de) * 1999-04-15 2000-02-10 Guenther Engineering Gmbh Kolben für Kältemittelverdichter
DE19926186A1 (de) * 1999-06-09 2000-12-14 Leybold Vakuum Gmbh Kolbenvakuumpumpe mit Auslassventil
DE20106700U1 (de) * 2001-04-18 2002-05-23 Alusuisse Bayrisches Druckgus Kolben für einen Kolbenverdichter
KR20010074253A (ko) * 2001-05-03 2001-08-04 강현인 스마트카드와 차량 번호판 인식 시스템에 의한 유료 도로논스톱 요금 징수 방법
AT414270B (de) * 2002-07-24 2006-10-15 Ventrex Automotive Gmbh Einrichtung zur verdichtung von gasen
AT414269B (de) * 2002-07-24 2006-10-15 Ventrex Automotive Gmbh Einrichtung zur verdichtung von gasen
DE10330366A1 (de) * 2003-06-30 2005-01-27 Dbw Metallverarbeitung Gmbh Kolbenverdichter
DE102004017040B4 (de) * 2004-04-02 2007-02-01 Hans-Walter Bodewein Kolbenpumpe und Zapfstation für Flüssiggas
DE202005017736U1 (de) * 2005-11-12 2006-01-12 Ventrex Automotive Gmbh Kolbenverdichter für gasförmige Medien
DE102005060320A1 (de) * 2005-12-16 2007-06-21 Continental Aktiengesellschaft Kompressoreinheit
DE102006053246A1 (de) * 2006-11-11 2008-05-15 Continental Aktiengesellschaft Kompressoreinheit
DE102006053245A1 (de) 2006-11-11 2008-05-15 Continental Aktiengesellschaft Kompressoreinheit
DE102007053750B4 (de) * 2007-11-12 2010-06-17 Jhou, Wen-San, An-Din Luftverdichter mit verbessertem Ventilbauelement
DE102008037585A1 (de) 2008-11-25 2010-05-27 Continental Reifen Deutschland Gmbh Kompressor
DE102008037584A1 (de) 2008-11-25 2010-05-27 Continental Reifen Deutschland Gmbh Kompressor
DE102011050714A1 (de) 2011-05-30 2012-12-06 Continental Reifen Deutschland Gmbh Kompressoreinheit
DE102011050713A1 (de) 2011-05-30 2012-12-06 Continental Reifen Deutschland Gmbh Ventil mit einem einteiligen Ventilkörper
DE102011050806A1 (de) 2011-06-01 2012-12-06 Continental Reifen Deutschland Gmbh Kompressor mit Druckbegrenzung
DE102013107585A1 (de) * 2013-07-17 2015-01-22 Continental Reifen Deutschland Gmbh Kompressor mit Druckbegrenzung
DE102013107850A1 (de) 2013-07-23 2015-01-29 Continental Reifen Deutschland Gmbh Kompressor mit Druckbegrenzung
DE102014205067A1 (de) 2014-03-19 2015-09-24 Continental Reifen Deutschland Gmbh Vorrichtung zum Abdichten und Aufpumpen aufblasbarer Gegenstände
DE102019217779A1 (de) 2019-04-26 2020-10-29 Continental Reifen Deutschland Gmbh Tragbares/transportables System zum Abdichten und Aufpumpen von Fahrzeugluftreifen mit gradliniger Druckluftströmung
DE102019120730A1 (de) * 2019-07-31 2021-02-04 Amk Holding Gmbh & Co. Kg Zylinderkolben für einen Luftkompressor

Family Cites Families (13)

* Cited by examiner, † Cited by third party
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DE147333C (fr) *
DE148013C (fr) *
US1390680A (en) * 1921-02-28 1921-09-13 Moon Brothers Mfg Company Lubricating device for pump-pistons
US1577570A (en) * 1925-08-20 1926-03-23 Egli Fred Pump
DE734441C (de) * 1939-02-05 1943-04-15 Schmidt Sche Heissdampf Ges M Kolbendampfmaschine
US2984190A (en) * 1955-10-14 1961-05-16 Raymond A Dibley Valve construction
DE1748885U (de) * 1957-03-16 1957-07-18 Walter Breiter K G Kolben fuer saug- und druckpumpen.
FR1463769A (fr) * 1963-05-29 1966-07-22 Compresseur à piston et ses procédé et dispositif de refroidissement et ses dispositifs de montage
DE2311048C3 (de) * 1973-03-06 1978-04-06 Bayrisches Druckgusswerk Thurner Kg, 8015 Markt Schwaben Verdichterkolben
JPS58131469A (ja) * 1982-01-29 1983-08-05 Honda Motor Co Ltd シ−ル装置
DE3333329A1 (de) * 1983-09-15 1985-03-28 Becker, Erich, 7812 Bad Krozingen Kolbenpumpe, insbesondere pendelkolbenpumpe
DE3616968A1 (de) * 1986-05-20 1987-11-26 Bosch Gmbh Robert Taumelkolben-kompressor
DE4203384C2 (de) * 1992-02-06 1994-10-20 Hunger Walter Dr Ing E H Kolben einer Kolbenmaschine

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP0725897B1 (fr) 1998-03-04
WO1996005430A1 (fr) 1996-02-22
EP0725897A1 (fr) 1996-08-14
DE4429097A1 (de) 1996-02-22
DE59501550D1 (de) 1998-04-09
ES2113211T3 (es) 1998-04-16
ATE163735T1 (de) 1998-03-15
ATE163734T1 (de) 1998-03-15
WO1996005429A1 (fr) 1996-02-22
EP0725898B1 (fr) 1998-03-04
DE59501549D1 (de) 1998-04-09
ES2113212T3 (es) 1998-04-16

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