EP1835178B1 - Dispositif de joint pour une pompe à vide à piston - Google Patents

Dispositif de joint pour une pompe à vide à piston Download PDF

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Publication number
EP1835178B1
EP1835178B1 EP07003705A EP07003705A EP1835178B1 EP 1835178 B1 EP1835178 B1 EP 1835178B1 EP 07003705 A EP07003705 A EP 07003705A EP 07003705 A EP07003705 A EP 07003705A EP 1835178 B1 EP1835178 B1 EP 1835178B1
Authority
EP
European Patent Office
Prior art keywords
piston
sealing
cylinder
arrangement according
sealing element
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.)
Not-in-force
Application number
EP07003705A
Other languages
German (de)
English (en)
Other versions
EP1835178A1 (fr
Inventor
Thomas Cromm
Ronald Dr. Sachs
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
Publication of EP1835178A1 publication Critical patent/EP1835178A1/fr
Application granted granted Critical
Publication of EP1835178B1 publication Critical patent/EP1835178B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F04B39/0005—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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston

Definitions

  • the invention relates to a sealing arrangement for a cylinder-piston system of a reciprocating vacuum pump according to the preamble of the first claim.
  • Piston vacuum pumps have one or more cylinders, in each of which a piston performs an oscillating movement with which the compression space is periodically increased and decreased. In the period in which the compression space is reduced, gas is compressed and expelled at the end of the movement.
  • Patents US 3,343,844 and US 3,603,215 show cylinder-piston systems which, in addition to a sealing element with an L-shaped cross-section, have an annular guide element.
  • the WO 98/48170 shows a piston vacuum pump with an L-shaped seal.
  • the wall of the piston serves to guide the piston in the cylinder.
  • the JP 07 133866 proposes, in addition to a seal arranged centrally on the piston, to provide a guide element terminating with the end face of the piston.
  • the object is therefore to present a sealing arrangement for a cylinder-piston system of a piston vacuum pump, which has the advantages of the L-shaped sealing element, but reduces the wear of this component.
  • the invention uses in addition to the L-shaped sealing element, a guide element which is arranged on the side remote from the compression space of the sealing element.
  • This guide element takes mechanical stress from the sealing element, which arises in particular by the periodic linear motion superimposed pendulum motion and is especially pronounced in the reversal points. Due to the reduced load increases the life of the sealing element. At the same time, a positive effect on the noise development of the cylinder-piston system is observed.
  • An advantageous development is to guide the damping element in a circular groove, which has at least one cut-away. As a result, an expansion space is created, in which the damping element can expand under pressure load. This in turn avoids that the damping element presses under pressure load the L-shaped sealing element with excessive force against the cylinder wall and thus increases the friction localized.
  • the measure according to claim 7 causes the guide element engages only when it is really necessary. This is the case when the load on the sealing element resulting from deflection from the cylinder axis is too high due to the pendulum movements. At low loads, however, the guide element is not in frictional contact with the cylinder inner wall, so that abrasion is avoided.
  • the figure shows a non-scale section through the cylinder-piston system of a piston vacuum pump.
  • a cylinder 1 In a housing 15, a cylinder 1 is arranged.
  • a piston performs periodic movements, whereby a compression space 5 is periodically increased and decreased.
  • a reversal point of the movement hereinafter “lower reversal point” is characterized by the gas inlet process.
  • an opening 10 or a plurality of openings communicating with an inlet channel is provided in the cylinder wall.
  • the other reversal point hereinafter “upper reversal point”
  • the piston is displaced so far in the cylinder that the valve cover 12 is lifted off the valve seat 14 and overcomes the counter-tensioning force of the valve spring 13. The compressed gas is then removed via the gas outlet 11.
  • the piston is constructed in three parts in the embodiment and has a piston cover 2b, a piston sleeve 2a and a piston head 2c. Not shown is the connecting rod system, which is connected to the piston and causes its periodic movement.
  • An annular, L-shaped sealing element with L-shaped cross-section 3 is arranged on the piston and seals the gap between the piston and the cylinder inner wall.
  • One leg of the sealing element is fixed to the piston, while the other leg is free and slightly presses against the cylinder inner wall. Since the piston vacuum pump is designed as a dry pump, no working fluid is provided between the piston and the cylinder. Accordingly, the material pairing of sealing element 3 and cylinder 1 is to be selected, for example For example, plastics with PTFE components are used for the sealing element, while for the cylinder metal alloys are used, for example aluminum-based, possibly coated.
  • the piston performs a periodic movement, which is only theoretically largely linear.
  • the guide element touches the cylinder inner wall and the load passes from seal to guide element, or is distributed to both.
  • the rigidity of the guide element is so dimensioned, in particular low enough that it can still yield resiliently. This is important so that the pendulum movement and thus the striking of the guide element does not lead to a noticeable noise.
  • the smaller diameter also causes the guide member to be used only when needed and not subject to constant wear by rubbing against the cylinder inner wall in the normal, linear movement of the piston. Conceivable are other embodiments for the guide element, but achieve an equivalent effect.
  • said ring is guided in a groove provided on the piston and can move transversely to the piston axis, ie radially.
  • This ring can then be supported by a resilient element or even formed from an elastic material.
  • a damping element 6 which is designed in this embodiment as elastomeric rings. It prevents the free leg of the L-shaped sealing element from being pressed against the piston part 2a during oscillation of the piston, since this would generate noise.
  • the elastomer ring is compressed in the case of wobbling movement, or deflection of the piston from the cylinder center in the region of elastic deformation. The energy used for this comes from the wobbling motion, which is thus damped.
  • a spacer 7 is inserted between them.
  • a second sealing arrangement is arranged in mirror image at that end of the piston which faces away from the compression space. It too has a guide element 21 and an L-shaped sealing element 20.
  • the component 25 is annular and has a three-legged cross-section.
  • One of these legs 28 acts as a holding portion with which the component can be held on the piston.
  • a second leg 26 serves as a sealing element and has a maximum diameter D.
  • the third leg 27 assumes the function of the guide element. Its maximum diameter F is smaller than the maximum diameter D of the leg 26. This ensures that the leg 27 only in the pendulum movements in contact with the cylinder inner wall passes.
  • the stiffness of the leg 26 is less than that of the leg 27, which is soft enough to have an elastically resilient and damping effect.
  • FIG. 3 An improvement of the embodiment shows the Figure 3 , In the upper part a) of the figure, a section through the piston cover 2b along the piston axis is shown. In piston pin bosses 32, a piston pin 33 is held, which is inserted through the eye of a connecting rod 31 and there, for example, rotatably supported by a non-shown roller bearings.
  • the movements of the piston are indicated above the piston cover by arrows: on the one hand the ideal, linear movement L (left) and on the other the real tumbling motion T (right).
  • Part b) of the figure shows the section along the line AA through the piston cover. The small arrows indicate the points of the main load generated by the tumbling motion T.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (8)

  1. Dispositif d'étanchéité pour un système de piston et cylindre d'une pompe à vide à piston alternatif destiné à assurer l'étanchéité entre la paroi interne d'un cylindre (1) et un piston (2a, 2b, 2c) monté mobile dans ledit cylindre (1), comprenant au moins une bague d'étanchéité (3) en L dont une branche est fixée au piston pour assurer l'étanchéité statique et dont l'autre branche, libre, est placée au contact de la paroi interne du cylindre en assurant l'étanchéité dynamique, caractérisé en ce qu'il est monté sur le piston, entre le piston et le cylindre, du côté de la bague d'étanchéité opposé à une chambre de compression (5), une bague de guidage (4) en tant que pièce indépendante présentant une section transversale à plusieurs branches dont l'une est fixée au piston (2a, 2b, 2c) afin de garantir le positionnement axial de ladite bague de guidage (4).
  2. Dispositif d'étanchéité selon la revendication 1, caractérisé en ce qu'un élément amortisseur (6) est agencé entre le piston (2a, 2b, 2c) et la branche libre de la bague d'étanchéité en L.
  3. Dispositif d'étanchéité selon la revendication 2, caractérisé en ce que l'élément amortisseur (6) est agencé dans une rainure circulaire présentant au moins un secteur (34) élargi à la fraise.
  4. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est monté, à l'extrémité du piston (2a, 2b, 2c), du côté opposé à la chambre de compression (5), une seconde bague d'étanchéité (20) de section transversale en L, une branche du L étant libre et orientée dans le sens opposé à la chambre de compression.
  5. Dispositif d'étanchéité selon la revendication 3, caractérisé en ce que, sur le piston (2a, 2b, 2c), entre la chambre de compression (5) et la seconde bague d'étanchéité (20), il est agencé une seconde bague de guidage (21) entre le piston et la paroi interne du cylindre.
  6. Agencement de joint selon l'une quelconque des revendications précédentes, caractérisé en ce que la raideur de la bague de guidage (4) est supérieure à celle de la bague d'étanchéité en L mais suffisamment faible pour assurer une fonction de ressort élastique.
  7. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que le diamètre F de la bague de guidage (4) est inférieur au diamètre intérieur Z du,cylindre (1).
  8. Dispositif d'étanchéité selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'un écarteur annulaire (7) est agencé entre la bague d'étanchéité (3) et la bague de guidage (4).
EP07003705A 2006-03-18 2007-02-23 Dispositif de joint pour une pompe à vide à piston Not-in-force EP1835178B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006012532A DE102006012532A1 (de) 2006-03-18 2006-03-18 Dichtungsanordnung für eine Hubkolbenvakuumpumpe

Publications (2)

Publication Number Publication Date
EP1835178A1 EP1835178A1 (fr) 2007-09-19
EP1835178B1 true EP1835178B1 (fr) 2009-01-07

Family

ID=38024129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07003705A Not-in-force EP1835178B1 (fr) 2006-03-18 2007-02-23 Dispositif de joint pour une pompe à vide à piston

Country Status (5)

Country Link
US (1) US7669516B2 (fr)
EP (1) EP1835178B1 (fr)
JP (1) JP5107594B2 (fr)
AT (1) ATE420288T1 (fr)
DE (2) DE102006012532A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061897A1 (de) 2008-12-11 2010-06-17 Pfeiffer Vacuum Gmbh Kolbenvakuumpumpe
DE102008062054B4 (de) * 2008-12-12 2019-05-29 Pfeiffer Vacuum Gmbh Anordnung mit Vakuumpumpe und Verfahren zum Betrieb einer Vakuumpumpe
DE102009057070B9 (de) * 2009-12-04 2012-11-29 Maquet Gmbh & Co. Kg Kolbenmaschine zum Einsatz als Vakuumpumpe für medizinische Zwecke
JP5458439B2 (ja) * 2010-03-24 2014-04-02 株式会社医器研 ロータリ式シリンダ装置
EP2935859B1 (fr) * 2012-12-20 2016-12-21 Robert Bosch GmbH Pompe à carburant alternative pour moteur à combustion interne
US10215229B2 (en) * 2013-03-14 2019-02-26 Etagen, Inc. Mechanism for maintaining a clearance gap
WO2015042224A1 (fr) * 2013-09-19 2015-03-26 Mag Aerospace Industries, Llc Pompes à pression différentielle
GB2530560A (en) * 2014-09-26 2016-03-30 Gm Global Tech Operations Inc Fire ring for a piston of an internal combustion engine and method to manufacture a piston of an internal combustion engine
CN112855520B (zh) * 2020-06-23 2022-04-22 江苏锡安达防爆股份有限公司 一种粘稠物料行程受控的双缸泵送装置

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DE20343C (de) 1882-01-03 1882-11-20 L. H. PHILIPPI in Hamburg Verfahren zur Herstellung von Modellen für Gufsformen
AT88733B (de) * 1915-04-09 1922-06-10 Ernst Becker Kolbendichtung.
DE337298C (de) 1920-05-20 1921-05-28 Paschka & Co Laufgewichts-Tischwaage
US2106829A (en) * 1935-03-27 1938-02-01 Johns Manville Packing assembly
US2318757A (en) * 1940-03-05 1943-05-11 Johns Manville Packing
US2431957A (en) * 1944-01-24 1947-12-02 William N Noviss Piston packing
US2471477A (en) * 1946-03-08 1949-05-31 Air Liquide Piston packing
US3343844A (en) * 1964-02-28 1967-09-26 Hypro Inc Cup backing assembly
US3603215A (en) * 1969-03-28 1971-09-07 Hypro Inc Expanded piston cup and improved spreader
JPS62154285U (fr) * 1986-03-20 1987-09-30
JPH07133866A (ja) * 1993-11-10 1995-05-23 Hitachi Constr Mach Co Ltd シリンダ装置
US5921755A (en) * 1997-04-21 1999-07-13 Dry Vacuum Technologies, Inc. Dry vacuum pump
JP3710288B2 (ja) * 1998-06-03 2005-10-26 株式会社日立製作所 エアコンプレッサのピストン構造
IT248789Y1 (it) * 1999-11-30 2003-02-20 Knorr Bremse Systeme Pompa volumetrica alternativa, particolarmente per un gruppo dicomando servoassistito di un innesto a frizione per un autoveicolo
JP2004316578A (ja) * 2003-04-18 2004-11-11 Matsushita Electric Ind Co Ltd エアーポンプ
DE10337298A1 (de) * 2003-08-14 2005-03-03 Pfeiffer Vacuum Gmbh Dichtungsanordnung für ein Zylinder-Kolben-System
DE10339838A1 (de) * 2003-08-29 2005-03-17 Pfeiffer Vacuum Gmbh Vakuumpumpe

Also Published As

Publication number Publication date
JP2007247643A (ja) 2007-09-27
DE502007000351D1 (de) 2009-02-26
JP5107594B2 (ja) 2012-12-26
DE102006012532A1 (de) 2007-09-20
US20070274847A1 (en) 2007-11-29
EP1835178A1 (fr) 2007-09-19
ATE420288T1 (de) 2009-01-15
US7669516B2 (en) 2010-03-02

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