EP1319131A1 - Compound-reibungsvakuumpumpe - Google Patents
Compound-reibungsvakuumpumpeInfo
- 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
Links
- 150000001875 compounds Chemical class 0.000 title claims description 6
- 230000007704 transition Effects 0.000 claims abstract description 18
- 238000003801 milling Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001061 forehead Anatomy 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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
Description
Claims
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 (de) | 2000-09-21 | 2001-08-09 | Compound-reibungsvakuumpumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1319131A1 true EP1319131A1 (de) | 2003-06-18 |
EP1319131B1 EP1319131B1 (de) | 2008-10-01 |
Family
ID=7657084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01974147A Expired - Lifetime EP1319131B1 (de) | 2000-09-21 | 2001-08-09 | Compound-reibungsvakuumpumpe |
Country Status (5)
Country | Link |
---|---|
US (1) | US6890146B2 (de) |
EP (1) | EP1319131B1 (de) |
JP (1) | JP2004510100A (de) |
DE (2) | DE10046766A1 (de) |
WO (1) | WO2002027189A1 (de) |
Families Citing this family (8)
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)
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 |
GB2232205B (en) * | 1987-12-25 | 1991-11-13 | Sholokhov Valery B | Molecular vacuum pump |
WO1989008192A1 (en) * | 1988-02-26 | 1989-09-08 | 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 |
-
2000
- 2000-09-21 DE DE10046766A patent/DE10046766A1/de not_active Withdrawn
-
2001
- 2001-08-09 DE DE50114375T patent/DE50114375D1/de not_active Expired - Lifetime
- 2001-08-09 US US10/380,988 patent/US6890146B2/en not_active Expired - Fee Related
- 2001-08-09 WO PCT/EP2001/009194 patent/WO2002027189A1/de active IP Right Grant
- 2001-08-09 EP EP01974147A patent/EP1319131B1/de not_active Expired - Lifetime
- 2001-08-09 JP JP2002530533A patent/JP2004510100A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO0227189A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6890146B2 (en) | 2005-05-10 |
US20040033130A1 (en) | 2004-02-19 |
WO2002027189A1 (de) | 2002-04-04 |
DE10046766A1 (de) | 2002-04-11 |
DE50114375D1 (en) | 2008-11-13 |
JP2004510100A (ja) | 2004-04-02 |
EP1319131B1 (de) | 2008-10-01 |
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