EP1319131A1 - Pompe a vide a friction composee - Google Patents

Pompe a vide a friction composee

Info

Publication number
EP1319131A1
EP1319131A1 EP01974147A EP01974147A EP1319131A1 EP 1319131 A1 EP1319131 A1 EP 1319131A1 EP 01974147 A EP01974147 A EP 01974147A EP 01974147 A EP01974147 A EP 01974147A EP 1319131 A1 EP1319131 A1 EP 1319131A1
Authority
EP
European Patent Office
Prior art keywords
stage
pump
stator
transition
turbomolecular
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
EP01974147A
Other languages
German (de)
English (en)
Other versions
EP1319131B1 (fr
Inventor
Roland Blumenthal
Stefan Hundertmark
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
Application filed by Leybold Vakuum GmbH filed Critical Leybold Vakuum GmbH
Publication of EP1319131A1 publication Critical patent/EP1319131A1/fr
Application granted granted Critical
Publication of EP1319131B1 publication Critical patent/EP1319131B1/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
    • F04D19/042—Turbomolecular vacuum 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F04D29/544—Blade shapes

Definitions

  • the invention relates to a friction vacuum pump with at least one turbomolecular pump stage, with a molecular pump stage adjoining it on the pressure side, and with a transition stage located between the turbomolecular pump stage and the molecular pump stage.
  • turbomolecular pumps with downstream molecular stages which are generally designed as threaded pump stages, also called compound pumps
  • the flow behavior of the pumped gases in the transition region changes from molecular (at pressures below 10 ⁇ 3 mbar) to laminar (from about 10 "2 mbar)
  • the gas When the gas is moved from the turbo stage to the threaded stage, it has to be diverted from a primarily tangential flow direction to a primarily axial flow direction
  • Known designs of this transition area have the disadvantage that flow losses occur, which considerably impair the pumping speed of the pump. From DE 297 17 079 a friction vacuum pump with the features mentioned above is known.
  • a component of the transition stage is a centrifugal pump, which is formed by webs on the rotor side that extend essentially radially.
  • This solution has the effect that the gases are directed into the thread stage; however, their promotional impact is limited.
  • the previously known solution assumes that the diameter of the threaded pump stage is larger than the diameter of the turbopump stage. It can therefore not be used in friction pumps with high pumping capacities, since the diameter of the rotor of the molecular pump stage cannot be chosen arbitrarily large because of the high centrifugal forces.
  • the content of DE-A 196 32 874 also belongs to the prior art. From this it is known to provide a filling stage which is equipped with vanes between the turbomolecular pump stage and the subsequent threaded pump stage. This solution is also difficult to manufacture. In addition, high mechanical stresses arise in the area of the base of the wing during operation.
  • the present invention is based on the object of creating a vacuum-technically optimized transition from the turbomolecular range to the molecular range, which does not have the disadvantages described. According to the invention, this object is achieved in that the transition stage is part of the stator and has a flow cross-section which essentially extends in the tangential direction and tapers continuously in the flow direction.
  • the solution according to the invention also takes into account that the flow velocity of the gases in the transition area concerned here is substantially greater in the tangential direction than in the axial direction (factor between 10 and 30). To avoid sudden changes in the flow cross-section, it is therefore advantageous to implement a tapering that extends essentially in the tangential direction, so that a tapering with a slight slope results.
  • the pitch depends on the number of blades in the transition stage and the ratio of blade length and diameter of the subsequent thread stage. The number of blades in the transition stage is determined using the same criteria as the previous turbo stages.
  • the flow openings designed according to the invention are formed in a stator ring disk, they can be manufactured in a simple manner by milling.
  • the inexpensive "forehead" can be used as the milling process, with a cylindrical tool if the blades that limit the flow cross-sections do not overlap. If the blades overlap, they can be manufactured with a milling cutter that has an enlarged diameter on the face.
  • FIGS. 1 to 7. Show it
  • FIG. 1 shows a section through a compound pump according to the invention
  • FIG. 2 shows a stator half ring designed according to the invention
  • FIG. 3 shows a plan view of a developed section of a stator half ring
  • FIG. 4 shows a section through the stator half ring according to FIG. 3,
  • Figures 5 and 6 plan views of further (developed) versions
  • FIG. 7 shows a section through the stator half ring according to FIG. 6.
  • the pump itself is denoted by 1, its inlet by 2 and its outlet by 3.
  • the housing of the pump 1 comprises the two sections 4 and 5.
  • the housing section 4 surrounds the stator 6 and the rotor 7 of the turbomolecular pump stage.
  • the stator 6 comprises schematically indicated blade half rings 8 and spacer rings 9, which together form a self-centering stator package.
  • the rotor 7 is equipped with the rotor blades 10. Only the stator half rings, the blades of which together with the last rotor blade row 10 on the pressure side form the last turbomolecular pump stage on the pressure side, are shown somewhat more precisely and are designated by 23.
  • FIG. 2 shows a perspective view of one of these stator half rings 23.
  • the housing section 4 likewise surrounds the stator 15 and the rotor 12 of the threaded pump stage, the delivery space or delivery gap of which is designated by 13.
  • the thread 14 of this stage can be arranged on the stator or rotor side. In the exemplary embodiment shown, it is arranged on the stator side and is part of a stator sleeve 15 which can be mounted independently of the housing section 4.
  • the rotor 7 of the turbomolecular pump stage 7, 8 and the rotor 12 of the threaded pump stage 11, 12 are components of a jointly rotating system 7, 12.
  • the rotor 12 of the threaded pump stage forms the pressure side end of this system and can be designed as a disc or G ⁇ Ockeniform (as shown in Figure 1).
  • the housing section 5 surrounds the drive motor 16, the stator of which is designated 17 and the rotor of which is designated 18.
  • the housing section 5 is part of a chassis 19 with an interior in which the drive motor 16 and other components are located.
  • the shaft 21, which carries the rotors 7 and 12 of the compound pump, is also mounted in the chassis 19. Only the upper bearing 22 is visible. It is a mechanical bearing that can also be replaced by a magnetic bearing. Otherwise, the chassis 19 is the carrier of all other components of the pump 1.
  • the stator half-ring 23 shown in FIG. 2 consists of a half-ring disk 24 with a plurality of through-openings 25 distributed over its circumference. These are formed by blade sections .26, which extend essentially radially and are preferably produced by milling.
  • the throughflow openings 25 are designed such that overall there is a throughflow cross section which extends essentially in the tangential direction and tapers continuously in the flow direction. This is achieved in that the length of the blade sections 26 (their radial extension) is greater on their suction side (ls) than on their pressure side (ld), i. H. that the distance between the lateral boundary surfaces 27, 28 of the throughflow openings 25 decreases in the direction of flow.
  • FIGS. 2, 3 and 4 show designs of a stator half ring 23 in which the blade sections 26 do not overlap. They allow a look through the half ring disk 23 in the axial direction (indicated by the arrow 38 in FIG. 4).
  • the blade sections can be produced by “foreheading”, specifically with a cylindrical tool 29 (cf. FIG. 4).
  • the blade sections 26 overlap one another. These designs also allow the production of the stator half rings by milling. The prerequisite is that the tool 29 has an enlarged diameter at the end (see FIG. 7).
  • the conveyor gap 13 of the threaded stage 12, 15 adjoining the turbo stages is indicated by dashed lines.
  • the conveying gaps 13 have different diameters di, d 2 and d 3 in these designs.
  • the design of the flow openings 25 according to the invention permits adaptation to different diameters of the delivery gap 13. This can be done by selecting the position of the boundary surfaces 27, 28, specifically their inclinations to the respective tangents, such that the conveying gap 13 lies approximately in the middle of the radial extensions ld of the blade sections 26 on their pressure side.

Landscapes

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

Abstract

La présente invention concerne une pompe à vide à friction (1) comprenant au moins un étage de pompe turbomoléculaire, un étage de pompe moléculaire, connecté à l'étage de pompe turbomoléculaire côté pression, ainsi qu'un étage intermédiaire se trouvant entre l'étage de pompe turbomoléculaire et l'étage de pompe moléculaire. Afin d'améliorer le passage de la zone turbomoléculaire à la zone moléculaire, l'étage intermédiaire présente une section transversale de passage qui diminue de manière continue dans la direction tangentielle.
EP01974147A 2000-09-21 2001-08-09 Pompe a vide a friction composee Expired - Lifetime EP1319131B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10046766A DE10046766A1 (de) 2000-09-21 2000-09-21 Compound-Reibungsvakuumpumpe
DE10046766 2000-09-21
PCT/EP2001/009194 WO2002027189A1 (fr) 2000-09-21 2001-08-09 Pompe a vide a friction composee

Publications (2)

Publication Number Publication Date
EP1319131A1 true EP1319131A1 (fr) 2003-06-18
EP1319131B1 EP1319131B1 (fr) 2008-10-01

Family

ID=7657084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974147A Expired - Lifetime EP1319131B1 (fr) 2000-09-21 2001-08-09 Pompe a vide a friction composee

Country Status (5)

Country Link
US (1) US6890146B2 (fr)
EP (1) EP1319131B1 (fr)
JP (1) JP2004510100A (fr)
DE (2) DE10046766A1 (fr)
WO (1) WO2002027189A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6932564B2 (en) * 2002-12-19 2005-08-23 Forced Physics Corporation Heteroscopic turbine
JP4676731B2 (ja) * 2004-09-10 2011-04-27 エドワーズ株式会社 ターボ分子ポンプ固定翼及び真空ポンプ
DE102009035332A1 (de) * 2009-07-30 2011-02-03 Pfeiffer Vacuum Gmbh Vakuumpumpe
GB2498816A (en) * 2012-01-27 2013-07-31 Edwards Ltd Vacuum pump
DE102013213256A1 (de) * 2013-07-05 2015-01-08 Oerlikon Leybold Vacuum Gmbh Statorscheibe
CN104791264A (zh) * 2015-04-20 2015-07-22 东北大学 一种带有过渡结构的复合分子泵
GB2557679A (en) * 2016-12-15 2018-06-27 Edwards Ltd Stator blade unit for a turbomolecular pump
GB2569314A (en) * 2017-12-12 2019-06-19 Edwards Ltd A turbomolecular pump and method and apparatus for controlling the pressure in a process chamber

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969039A (en) 1974-08-01 1976-07-13 American Optical Corporation Vacuum pump
JPS6336096A (ja) * 1986-07-30 1988-02-16 Hitachi Ltd 渦流型真空ポンプ
WO1989006319A1 (fr) * 1987-12-25 1989-07-13 Sholokhov Valery B Pompe a vide moleculaire
GB2226603B (en) 1988-02-26 1992-07-29 Nikolai Mikhailovich Novikov Turbomolecular vacuum pump
JP2628351B2 (ja) * 1988-07-26 1997-07-09 株式会社大阪真空機器製作所 複合分子ポンプ
IT1241177B (it) 1990-02-16 1993-12-29 Varian Spa Statore per pompa turbomolecolare.
US5358373A (en) * 1992-04-29 1994-10-25 Varian Associates, Inc. High performance turbomolecular vacuum pumps
DE4216237A1 (de) * 1992-05-16 1993-11-18 Leybold Ag Gasreibungsvakuumpumpe
DE4314418A1 (de) * 1993-05-03 1994-11-10 Leybold Ag Reibungsvakuumpumpe mit unterschiedlich gestalteten Pumpenabschnitten
US5456575A (en) * 1994-05-16 1995-10-10 Varian Associates, Inc. Non-centric improved pumping stage for turbomolecular pumps
DE19632874A1 (de) 1996-08-16 1998-02-19 Leybold Vakuum Gmbh Reibungsvakuumpumpe
DE29717079U1 (de) 1997-09-24 1997-11-06 Leybold Vakuum GmbH, 50968 Köln Compoundpumpe
JP3013083B2 (ja) * 1998-06-23 2000-02-28 セイコー精機株式会社 ターボ分子ポンプ
DE19937393A1 (de) * 1999-08-07 2001-02-08 Leybold Vakuum Gmbh Statorring für eine Turbomolekularvakuumpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0227189A1 *

Also Published As

Publication number Publication date
EP1319131B1 (fr) 2008-10-01
WO2002027189A1 (fr) 2002-04-04
US20040033130A1 (en) 2004-02-19
DE50114375D1 (en) 2008-11-13
JP2004510100A (ja) 2004-04-02
DE10046766A1 (de) 2002-04-11
US6890146B2 (en) 2005-05-10

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