EP1078166A1 - Pompe a vide a friction dotee d'un stator et d'un rotor - Google Patents

Pompe a vide a friction dotee d'un stator et d'un rotor

Info

Publication number
EP1078166A1
EP1078166A1 EP98946450A EP98946450A EP1078166A1 EP 1078166 A1 EP1078166 A1 EP 1078166A1 EP 98946450 A EP98946450 A EP 98946450A EP 98946450 A EP98946450 A EP 98946450A EP 1078166 A1 EP1078166 A1 EP 1078166A1
Authority
EP
European Patent Office
Prior art keywords
rotor
vacuum pump
pump
friction vacuum
stages
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
EP98946450A
Other languages
German (de)
English (en)
Other versions
EP1078166B1 (fr
EP1078166B2 (fr
Inventor
Christian Beyer
Ralf Adamietz
Markus Henry
Günter Schütz
Heinrich Engländer
Gerhard Wilhelm Walter
Hans-Rudolf Fischer
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.)
Leybold GmbH
Original Assignee
Leybold Vakuum 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7867761&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1078166(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Leybold Vakuum GmbH filed Critical Leybold Vakuum GmbH
Publication of EP1078166A1 publication Critical patent/EP1078166A1/fr
Publication of EP1078166B1 publication Critical patent/EP1078166B1/fr
Application granted granted Critical
Publication of EP1078166B2 publication Critical patent/EP1078166B2/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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/168—Pumps specially adapted to produce a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F04D19/046—Combinations of two or more different types of pumps

Definitions

  • the invention relates to a friction vacuum pump with a stator and a rotor, which form at least two pump stages, each with a gas inlet, and with connection means for the pump stages, which are equipped with connection openings and serve to connect the gas inlets of the pump stages to devices to be evacuated.
  • a friction vacuum pump of this type is known. It is preferably used for the evacuation of corpuscular blasting devices (e.g. mass spectrometers) with chambers separated from each other by screens, in which different pressures should prevail during operation of the corpuscular blasting device. It is known per se to use separate vacuum pumps to generate these pressures.
  • DE-A-43 31 589 discloses using only one vacuum pump system to generate the various pressures required by the corpuscular jet device.
  • the pump system comprises two turbomolecular and one molecular (Holweck) pump stage. These pump stages are arranged axially one behind the other. Each pump stage has a gas inlet (front gas passage area), which is connected to the associated chamber of the pump to be evacuated via connection means. connecting device.
  • the housing itself and a laterally arranged additional housing serve as connection means.
  • the housing itself is equipped with a connection opening on the end face for connecting the gas inlet of the first pump stage to the device to be evacuated.
  • Connection lines are provided in the additional housing, which connect the associated inlets of the further pump stages to further connection openings. These in turn are each connected to the associated chambers in the device to be evacuated. Since the connection openings in the additional housing lie in a common plane (perpendicular to the rotor axis) with the connection opening of the first pump stage, the connecting lines located in the additional housing must be relatively long. This results in relatively large conductance losses in the connecting lines, which is particularly disadvantageous when a high pumping speed is desired, particularly in the area of an intermediate connection.
  • the present invention is based on the object of designing a friction vacuum pump of the type mentioned at the outset in such a way that the pumping speed of the intermediate stages is not impaired by high conductance losses in connecting lines.
  • connection openings lie in a plane which is located to the side of the pump stages, so that the distance between the connection openings and the rotor axis is as small as possible.
  • the implementation of the measures according to the invention has the consequence that the gases to be conveyed have to be redirected in the inlet area of the first pump stage, that is to say precisely where the pressure is lowest.
  • the resulting loss of conductivity can, however, be kept small, since the distance between the gas inlet and the level of the connection opening is still relatively small and, in addition, there is nothing to prevent larger diameters in this area.
  • the main purpose of the first pump stage is to ensure a high compression ratio.
  • the blade properties selected for the first pump stage must take this function into account. It is essential to separate the two working pressure ranges of the two pump stages.
  • a high pumping speed is generally only required at the intermediate inlets or inlets. This goal can also be achieved by choosing special blade geometries.
  • the application of the measures according to the invention ensures in this area in particular that losses in suction power are largely avoided.
  • the accessibility of the gas molecules to the gas inlet is decisive for the pumping speed of a pump stage.
  • the pump itself is denoted by 1, its housing by 2, its stator system by 3 and its rotor system by 4.
  • the rotor system includes shaft 5, which in turn is supported by bearings 6, 7 in bearing housing 8, connected to pump housing 2.
  • the drive motor 9, 10 is also located in the bearing housing.
  • the axis of rotation of the rotor system 4 is designated by 15.
  • a total of three pump stages 12, 13, 14 are provided, of which two (12, 13) are designed as turbomolecular vacuum pump stages and one (14) is designed as a molecular (Holweck) pump stage.
  • the outlet of the pump 17 connects to the molecular pump stage 14.
  • the first pump stage 12 located on the high vacuum side consists of four pairs of rotor blade rows 21 and stator blade rows 22. Its inlet, the effective gas passage area, is designated by 23.
  • the first pump stage 12 is followed by the second pump stage 13, which consists of three pairs of a stator blade row 22 and a rotor blade row 21. Your entry is designated 28.
  • the second pump stage 13 is spaced apart from the first pump stage 12.
  • the selected distance (height) a ensures the free accessibility of the gas molecules to be conveyed to the gas inlet 28.
  • the distance a is expediently greater than a quarter, preferably greater than a third, of the diameter of the rotor system 4.
  • the adjoining Holweck pump comprises a rotating cylinder section 29 which is opposed by stator elements 32, 33 equipped on the outside and inside in a known manner, each with a threaded groove 30, 31.
  • the rotor-side parts of the pump stages 12, 13, 14 form a unit which is connected to the shaft 5 in the operational state.
  • the shaft 5 passes through a central bore 25, so that there is no direct connection between the storage space and the space and thus the risk of back diffusion of lubricant vapors is eliminated.
  • the flying bearing of the rotor system 4 also serves this purpose. Bearings arranged on the high vacuum side and components which impair the conductance (bearing bracket) can be dispensed with.
  • the bell-shaped design of the part of the rotor system 4 close to the motor, however, keeps the distance of the bearings 6, 7 from the center of gravity of the rotor small.
  • the back diffusion of lubricant vapors can also be avoided by using magnetic bearings, which can be arranged at a more convenient location.
  • the housing 2 itself is used to implement the connection means according to the invention.
  • it is designed such that the planes of all connection openings 36, 37 lie parallel to the rotor axis 15.
  • the distance between the connection 37 and the associated gas inlet 28 is very small, so that conductance losses which impair the pumping speed of the pump stage 13 are negligible.
  • This would also apply to every other connection that would be downstream of the intermediate connection 37/28. Otherwise, the diameter of the connection opening 37 exceeds the height a by approximately twice. This measure also serves to reduce the conductance losses between inlet 28 and connection opening 37.
  • the pump 1 shown or its pump-effective elements are expediently designed such that a pressure of 10 ⁇ 4 to 10 ⁇ 7 , preferably 10 "5 to 10 " 6 , and in the area of the connection opening 36 A pressure of about 10 "2 to 10 ⁇ 4 mbar is generated in the area of the connection opening 37.
  • the subsequent, two-stage Holweck pumping stage (29, 30; 29, 31) ensures high fore-vacuum resistance, so that the pumping speed of the second pumping stage is usually independent of the fore-vacuum pressure.
  • this goal can be achieved by appropriately designing the blades of the first pump stage 12.
  • Another possibility is to arrange an orifice 38 in front of the inlet 23 of the first pump stage, the inner diameter of which determines the desired pumping speed.
  • the exemplary embodiment according to FIG. 2 differs from the exemplary embodiment according to FIG. 1 in that the diameter of the pump stages 13 and 14 following the first pump stage 12 is larger than the diameter of the pump stage 12.
  • the level of the connection openings 36, 37 is adapted to this situation. It is like that Axis 15 of the rotor 4 is inclined so that the distance between the connection openings 36, 37 and the associated gas inlets 23, 28 is as small as possible.
  • the angle of inclination ⁇ of the plane of the connection openings 36, 37 to the rotor axis 15 corresponds to the increase in the diameter of the pump stages. Optimally favorable distance ratios can be achieved in this way. In the illustrated embodiment, the angle of inclination is approximately 5 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Positive Displacement Air Blowers (AREA)

Abstract

Pompe à vide (1) à friction dotée d'un stator (3) et d'un rotor (4) qui forment au moins deux étages (12, 13, 14) de pompe avec chacun un orifice d'entrée (23, 28) de gaz, ainsi que de moyens de raccord pour les étages de pompe, lesdits moyens de raccord étant équipés d'ouvertures de raccord (36, 37) et servant à la connexion des orifices d'entrée (23, 28) de gaz des étages de pompe avec les installations dans lesquelles le vide doit être fait. Selon la présente invention, pour éviter des pertes de conduction élevées, les ouvertures de raccord (36, 37) se trouvent dans un plan qui est situé latéralement à proximité des étages (12, 13, 14) de pompe, si bien que l'écart entre les ouvertures de raccord (36, 37) et l'axe (15) du rotor est le plus petit possible.
EP98946450A 1998-05-14 1998-09-11 Pompe a vide a friction dotee d'un stator et d'un rotor Expired - Lifetime EP1078166B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19821634 1998-05-14
DE19821634A DE19821634A1 (de) 1998-05-14 1998-05-14 Reibungsvakuumpumpe mit Stator und Rotor
PCT/EP1998/005802 WO1999060275A1 (fr) 1998-05-14 1998-09-11 Pompe a vide a friction dotee d'un stator et d'un rotor

Publications (3)

Publication Number Publication Date
EP1078166A1 true EP1078166A1 (fr) 2001-02-28
EP1078166B1 EP1078166B1 (fr) 2003-06-11
EP1078166B2 EP1078166B2 (fr) 2007-09-05

Family

ID=7867761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98946450A Expired - Lifetime EP1078166B2 (fr) 1998-05-14 1998-09-11 Pompe a vide a friction dotee d'un stator et d'un rotor

Country Status (10)

Country Link
US (1) US6435811B1 (fr)
EP (1) EP1078166B2 (fr)
JP (1) JP4173637B2 (fr)
KR (1) KR20010025024A (fr)
CN (1) CN1115488C (fr)
AU (1) AU754944B2 (fr)
CA (1) CA2332777C (fr)
DE (2) DE19821634A1 (fr)
TW (1) TW370594B (fr)
WO (1) WO1999060275A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6090100A (en) 1992-10-01 2000-07-18 Chiron Technolas Gmbh Ophthalmologische Systeme Excimer laser system for correction of vision with reduced thermal effects
GB9921983D0 (en) * 1999-09-16 1999-11-17 Boc Group Plc Improvements in vacuum pumps
JP3777498B2 (ja) * 2000-06-23 2006-05-24 株式会社荏原製作所 ターボ分子ポンプ
JP2002138987A (ja) * 2000-10-31 2002-05-17 Seiko Instruments Inc 真空ポンプ
DE10302764A1 (de) * 2003-01-24 2004-07-29 Pfeiffer Vacuum Gmbh Vakuumpumpsystem
GB0409139D0 (en) 2003-09-30 2004-05-26 Boc Group Plc Vacuum pump
GB0322883D0 (en) * 2003-09-30 2003-10-29 Boc Group Plc Vacuum pump
DE10353034A1 (de) * 2003-11-13 2005-06-09 Leybold Vakuum Gmbh Mehrstufige Reibungsvakuumpumpe
GB0329839D0 (en) * 2003-12-23 2004-01-28 Boc Group Plc Vacuum pump
GB0414316D0 (en) * 2004-06-25 2004-07-28 Boc Group Plc Vacuum pump
GB0503946D0 (en) * 2005-02-25 2005-04-06 Boc Group Plc Vacuum pump
DE202005019644U1 (de) * 2005-12-16 2007-04-26 Leybold Vacuum Gmbh Turbomolekularpumpe
JP2007231938A (ja) * 2006-02-06 2007-09-13 Boc Edwards Kk 真空装置、真空装置における水蒸気分圧の急速低減方法、ロードロックチャンバー内の水蒸気分圧の上昇防止方法、および、真空装置用真空ポンプ
DE102008024764A1 (de) * 2008-05-23 2009-11-26 Oerlikon Leybold Vacuum Gmbh Mehrstufige Vakuumpumpe
DE202009003880U1 (de) * 2009-03-19 2010-08-05 Oerlikon Leybold Vacuum Gmbh Multi-Inlet-Vakuumpumpe
FR2984972A1 (fr) * 2011-12-26 2013-06-28 Adixen Vacuum Products Adaptateur pour pompes a vide et dispositif de pompage associe
EP2757266B1 (fr) 2013-01-22 2016-03-16 Agilent Technologies, Inc. Pompe à vide rotative
DE102013109637A1 (de) * 2013-09-04 2015-03-05 Pfeiffer Vacuum Gmbh Vakuumpumpe sowie Anordnung mit einer Vakuumpumpe
DE102013114290A1 (de) 2013-12-18 2015-06-18 Pfeiffer Vacuum Gmbh Vakuumpumpe
JP6488898B2 (ja) * 2015-06-09 2019-03-27 株式会社島津製作所 真空ポンプおよび質量分析装置
US10655638B2 (en) * 2018-03-15 2020-05-19 Lam Research Corporation Turbomolecular pump deposition control and particle management
US11519419B2 (en) 2020-04-15 2022-12-06 Kin-Chung Ray Chiu Non-sealed vacuum pump with supersonically rotatable bladeless gas impingement surface
GB2601515B (en) * 2020-12-02 2022-12-28 Agilent Technologies Inc Vacuum pump with elastic spacer
EP4293232A1 (fr) * 2023-10-17 2023-12-20 Pfeiffer Vacuum Technology AG Pompe

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US3189264A (en) * 1963-06-04 1965-06-15 Arthur Pfeiffer Company Vacuum pump drive and seal arrangement
DE1809902C3 (de) * 1968-11-20 1973-11-15 Arthur Pfeiffer-Vakuumtechnik Gmbh, 6330 Wetzlar Mehrstufige Turbo Molekularhoch vakuumpumpe
US3628894A (en) * 1970-09-15 1971-12-21 Bendix Corp High-vacuum mechanical pump
DE2442614A1 (de) † 1974-09-04 1976-03-18 Siemens Ag Turbomolekularpumpe
DE3826710A1 (de) * 1987-08-07 1989-02-16 Japan Atomic Energy Res Inst Vakuumpumpe
US5733104A (en) * 1992-12-24 1998-03-31 Balzers-Pfeiffer Gmbh Vacuum pump system
DE4331589C2 (de) * 1992-12-24 2003-06-26 Pfeiffer Vacuum Gmbh Vakuumpumpsystem
EP0603694A1 (fr) * 1992-12-24 1994-06-29 BALZERS-PFEIFFER GmbH Système à vide
DE29516599U1 (de) * 1995-10-20 1995-12-07 Leybold Ag Reibungsvakuumpumpe mit Zwischeneinlaß
GB9725146D0 (en) * 1997-11-27 1998-01-28 Boc Group Plc Improvements in vacuum pumps
US6193461B1 (en) * 1999-02-02 2001-02-27 Varian Inc. Dual inlet vacuum pumps

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Also Published As

Publication number Publication date
EP1078166B1 (fr) 2003-06-11
DE59808723D1 (de) 2003-07-17
KR20010025024A (ko) 2001-03-26
JP4173637B2 (ja) 2008-10-29
CN1292851A (zh) 2001-04-25
CN1115488C (zh) 2003-07-23
EP1078166B2 (fr) 2007-09-05
CA2332777A1 (fr) 1999-11-25
TW370594B (en) 1999-09-21
JP2002515568A (ja) 2002-05-28
CA2332777C (fr) 2007-11-06
AU9348198A (en) 1999-12-06
US6435811B1 (en) 2002-08-20
DE19821634A1 (de) 1999-11-18
AU754944B2 (en) 2002-11-28
WO1999060275A1 (fr) 1999-11-25

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