DE10339838A1 - Vacuum pump comprises a plunger having a coating on its casing surface and a cylinder having a coating on its inner surface - Google Patents

Vacuum pump comprises a plunger having a coating on its casing surface and a cylinder having a coating on its inner surface Download PDF

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Publication number
DE10339838A1
DE10339838A1 DE2003139838 DE10339838A DE10339838A1 DE 10339838 A1 DE10339838 A1 DE 10339838A1 DE 2003139838 DE2003139838 DE 2003139838 DE 10339838 A DE10339838 A DE 10339838A DE 10339838 A1 DE10339838 A1 DE 10339838A1
Authority
DE
Germany
Prior art keywords
coating
cylinder
vacuum pump
piston
plunger
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.)
Ceased
Application number
DE2003139838
Other languages
German (de)
Inventor
Eckhard Bez
Stefan Dr. Zabeschek
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.)
Pfeiffer Vacuum GmbH
Original Assignee
Pfeiffer Vacuum 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 Pfeiffer Vacuum GmbH filed Critical Pfeiffer Vacuum GmbH
Priority to DE2003139838 priority Critical patent/DE10339838A1/en
Publication of DE10339838A1 publication Critical patent/DE10339838A1/en
Ceased 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
    • 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
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/126—Cylinder liners
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

Vacuum pump comprises a plunger (1) having a coating (3) on its casing surface and a cylinder (2) having a coating (3) on its inner surface. At least one of the coatings is formed only as a partial coating.

Description

Die Erfindung betrifft eine Vakuumpumpe mit einem in einem Zylinder angeordneten Kolben.The The invention relates to a vacuum pump with one in a cylinder arranged piston.

Zum Stand der Technik ( US-PS 5,921,755 ) gehört eine Vakuumpumpe, die zur Abdichtung des in einem Zylinder angeordneten Kolbens im Querschnitt L-förmige Dichtungen vorsieht.The prior art ( U.S. Patent 5,921,755 ) includes a vacuum pump, which provides for sealing the disposed in a cylinder piston in cross-section L-shaped seals.

Nutzen sich die Dichtungen während des Betriebes der Vakuumpumpe durch ständige Reibung ab, und wird die Abnutzung nicht kontrolliert, kann es vorkommen, dass der Kolben unmittelbar an der Zylinderinnenwand anliegt und durch weiteres Auf- und Abbewegen des Kolbens dieser und der Zylinder Schaden nehmen.Use the seals during the operation of the vacuum pump by constant friction, and is If the wear is not controlled, it can happen that the piston directly abuts the cylinder inner wall and by further Moving up and down the piston of this and the cylinder damage.

Das der Erfindung zugrunde liegende technische Problem besteht darin, eine Vakuumpumpe anzugeben, die Notlaufeigenschaften aufweist, bei der also eine Beschädigung der Vakuumpumpe über einen längeren Zeitraum vermieden wird, auch wenn die Dichtungen abgenutzt sind.The The technical problem underlying the invention is that To specify a vacuum pump, the emergency running features, at so the damage the vacuum pump over a longer one Period is avoided, even if the seals are worn.

Dieses technische Problem wird durch eine Vakuumpumpe mit den Merkmalen des Anspruches 1 gelöst.This technical problem is due to a vacuum pump with the features of claim 1 solved.

Dadurch, dass die Vakuumpumpe einen Kolben und/oder einen Zylinder mit einer zusätzlichen Beschichtung aufweist, wobei die Beschichtung des Kolbens oder des Zylinders als teilflächige Beschichtung ausgebildet ist, ist im Falle eines vollständigen Abnutzens der L-förmigen Dichtung gewährleistet, dass nicht Metall auf Metall reibt, sondern dass das Metall des Kolbens oder des Zylinders auf der Beschichtung des Zylinders oder des Kolbens reibt.Thereby, that the vacuum pump has a piston and / or a cylinder with a additional coating having, wherein the coating of the piston or the cylinder as partial area Coating is formed in case of complete wear the L-shaped Seal ensures that does not rub metal on metal, but that the metal of the piston or the cylinder on the coating of the cylinder or the piston rubs.

Gemäß einer bevorzugten Ausführungsform der Erfindung wird der Kolben die erfindungsgemäße Beschichtung tragen, da dieser leichter zu beschichten ist als die Zylinderinnenwand.According to one preferred embodiment of Invention, the piston will wear the coating of the invention, since this is easier to coat than the cylinder inner wall.

Bei der zum Stand der Technik gehörenden Vakuumpumpe ist eine Spaltdichtung vorgesehen, die auf der Mantelfläche des Kolbens angeordnet ist. Es hat sich jedoch in der Praxis herausgestellt, dass diese vollflächige Beschichtung der Mantelfläche des Kolbens eine viel zu hohe Reibung verursacht, wodurch die Leistung der Pumpe in erheblichem Maße beeinträchtigt wird.at the prior art vacuum pump a gap seal is provided on the lateral surface of the Piston is arranged. However, it has turned out in practice that this full-surface Coating of the lateral surface the piston causes a much too high friction, causing the performance the pump is significantly impaired.

Aus diesem Grunde ist die erfindungsgemäße teilflächige Beschichtung von besonderem Vorteil, da hierdurch die auftretenden Reibungskräfte nur unerheblich beeinflusst werden. Darüber hinaus ist die teilflächige Beschichtung aus Kostenaspekten viel vorteilhafter.Out For this reason, the partial coating according to the invention is of particular Advantage, as a result, the friction forces occurring only are negligibly affected. In addition, the partial coating is much more advantageous for cost reasons.

Gemäß einer besonders bevorzugten Ausführungsform wird vorgeschlagen, die Beschichtung aus Polytetrafluorethylen (PTFE) auszubilden, da dieses Material eine geringe Abnutzung aufweist.According to one particularly preferred embodiment it is proposed to coat the polytetrafluoroethylene (PTFE) coating form, since this material has a low wear.

Sind die vorgesehenen L-förmigen Dichtungen abgenutzt, ist es Ziel der Erfindung, dass die Vakuumpumpe noch wenigstens 14 Tage aufgrund der Notlaufeigenschaften ohne Schaden betrieben werden kann.are the intended L-shaped Worn seals, it is the purpose of the invention that the vacuum pump still at least 14 days due to the emergency running properties without damage can be operated.

Die Beschichtung kann punktförmig, ringförmig, linienförmig und/oder wellenlinienförmig ausgebildet sein.The Coating can be punctiform, ring-shaped, linearly and / or wavy be educated.

Weitere Merkmale und Vorteile der Erfindung ergeben sich anhand der zugehörigen Zeichnung, in der zwei Ausführungsbeispiele der Erfindung nur beispielhaft dargestellt sind. Es zeigen:Further Features and advantages of the invention will become apparent from the accompanying drawings, in the two embodiments the invention are shown only by way of example. Show it:

1 einen Querschnitt durch einen Zylinder einer Vakuumpumpe mit beschichtetem Kolben; 1 a cross section through a cylinder of a vacuum pump with coated piston;

2 einen Querschnitt durch einen Zylinder einer Vakuumpumpe mit beschichteter Zylinderinnenwand. 2 a cross section through a cylinder of a vacuum pump with coated cylinder inner wall.

1 zeigt einen Kolben (1), der in einem Zylinder (2) angeordnet ist. Der Kolben (1) trägt eine Beschichtung (3), die punktförmig ausgebildet ist. Der Zylinder (2) weist keine Beschichtung auf. 1 shows a piston ( 1 ) in a cylinder ( 2 ) is arranged. The piston ( 1 ) carries a coating ( 3 ), which is punctiform. The cylinder ( 2 ) has no coating.

2 zeigt den Zylinder (2), der eine linienförmige Beschichtung (3) trägt. 2 shows the cylinder ( 2 ), which has a linear coating ( 3 ) wearing.

Claims (3)

Vakuumpumpe mit einem in einem Zylinder angeordneten Kolben, dadurch gekennzeichnet, dass der Kolben (1) auf seiner Mantelfläche und/oder der Zylinder (2) auf seiner Innenfläche eine Beschichtung (3) aufweist, wobei wenigstens eine Beschichtung (3) lediglich als teilweise Beschichtung (3) ausgebildet ist.Vacuum pump with a piston arranged in a cylinder, characterized in that the piston ( 1 ) on its lateral surface and / or the cylinder ( 2 ) on its inner surface a coating ( 3 ), wherein at least one coating ( 3 ) only as a partial coating ( 3 ) is trained. Vakuumpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Beschichtung (3) punktförmig, ringförmig, linienförmig und/oder wellenlinienförmig ausgebildet ist.Vacuum pump according to claim 1, characterized in that the coating ( 3 ) is punctiform, annular, linear and / or wave-shaped. Vakuumpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Beschichtung (3) aus Polytetrafluorethylen (PTFE) besteht.Vacuum pump according to claim 1, characterized in that the coating ( 3 ) consists of polytetrafluoroethylene (PTFE).
DE2003139838 2003-08-29 2003-08-29 Vacuum pump comprises a plunger having a coating on its casing surface and a cylinder having a coating on its inner surface Ceased DE10339838A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2003139838 DE10339838A1 (en) 2003-08-29 2003-08-29 Vacuum pump comprises a plunger having a coating on its casing surface and a cylinder having a coating on its inner surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2003139838 DE10339838A1 (en) 2003-08-29 2003-08-29 Vacuum pump comprises a plunger having a coating on its casing surface and a cylinder having a coating on its inner surface

Publications (1)

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DE10339838A1 true DE10339838A1 (en) 2005-03-17

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DE2003139838 Ceased DE10339838A1 (en) 2003-08-29 2003-08-29 Vacuum pump comprises a plunger having a coating on its casing surface and a cylinder having a coating on its inner surface

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1835178A1 (en) * 2006-03-18 2007-09-19 Pfeiffer Vacuum GmbH Sealing assembly for a piston type vacuum pump
FR2963953A1 (en) * 2010-08-19 2012-02-24 Bosch Gmbh Robert PISTON PUMP AND METHOD OF MAKING SUCH A PUMP

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2521182A1 (en) * 1975-05-13 1976-11-25 Kloeckner Werke Ag INCLINED DISC AXIAL PISTON MACHINE
DD277719A1 (en) * 1988-12-05 1990-04-11 Werk Fuer Tech Glas Ilmenau Ze PISTONS FOR DOSING DEVICES AND METHOD FOR THE PRODUCTION THEREOF
US5921755A (en) * 1997-04-21 1999-07-13 Dry Vacuum Technologies, Inc. Dry vacuum pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2521182A1 (en) * 1975-05-13 1976-11-25 Kloeckner Werke Ag INCLINED DISC AXIAL PISTON MACHINE
DD277719A1 (en) * 1988-12-05 1990-04-11 Werk Fuer Tech Glas Ilmenau Ze PISTONS FOR DOSING DEVICES AND METHOD FOR THE PRODUCTION THEREOF
US5921755A (en) * 1997-04-21 1999-07-13 Dry Vacuum Technologies, Inc. Dry vacuum pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1835178A1 (en) * 2006-03-18 2007-09-19 Pfeiffer Vacuum GmbH Sealing assembly for a piston type vacuum pump
FR2963953A1 (en) * 2010-08-19 2012-02-24 Bosch Gmbh Robert PISTON PUMP AND METHOD OF MAKING SUCH A PUMP

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OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8110 Request for examination paragraph 44
R002 Refusal decision in examination/registration proceedings
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Effective date: 20121017