EP0985828A1 - Procédé et dispositif pour éviter les dépôts dans une pompe turbomoléculaire à palier magnétique ou gazeux - Google Patents
Procédé et dispositif pour éviter les dépôts dans une pompe turbomoléculaire à palier magnétique ou gazeux Download PDFInfo
- Publication number
- EP0985828A1 EP0985828A1 EP99402125A EP99402125A EP0985828A1 EP 0985828 A1 EP0985828 A1 EP 0985828A1 EP 99402125 A EP99402125 A EP 99402125A EP 99402125 A EP99402125 A EP 99402125A EP 0985828 A1 EP0985828 A1 EP 0985828A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- active gas
- turbomolecular pump
- rotor
- turbomolecular
- stator
- 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
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 55
- 150000001875 compounds Chemical class 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 230000008021 deposition Effects 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 abstract 1
- 210000002381 plasma Anatomy 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
-
- 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
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
Definitions
- the present invention relates to pumps turbomolecular which, combined with primary pumps, allow to achieve and maintain a high vacuum in an enclosure.
- Turbomolecular pumps generally have a rotor and a multistage stator, the rotor being carried by bearings. Going from the inside of the enclosure to the outside, the gas pressure gradually increases from one stage to another, and the floors near the interior of the enclosure are the low pressure stages, while the stages near the outlet are the high pressure stages.
- these turbomolecular pumps When they have magnetic or gas bearings to support the rotor, these turbomolecular pumps have the characteristic of having the rotor physically isolated and therefore electrically from the stator and the pump body which is at the reference potential, i.e. the mass of the equipment.
- Turbomolecular pumps are frequently used in plasma etching or deposition equipment in the semiconductor industry.
- turbomolecular pumps in etching or plasma deposition processes, we already have found that it tends to form deposits of materials from reaction products.
- residues from the etching of resin masks tend to settle on surfaces inside of the rotor and stator, and preferably in the high pressure stages of the turbomolecular pump.
- the turbomolecular pump and in particular the rotor are in direct contact with the plasma. Therefore, the rotor, which is electrically isolated, carries a potential different from the mass.
- the pressure conditions in the high pressure part of the turbomolecular pump combined with the short distance separating the rotor and the stator and with the potential difference between the rotor and the stator, cause electrical discharges between the rotor and the stator. These discharges, in the absence deposits, are evenly distributed between the rotor surfaces and stator and are not harmful.
- a grid connected to ground.
- the high density of plasmas used screens require very fine pitch, which can be less than 100 ⁇ m.
- the presence of the grids considerably reduces the conductance of the pump, and alters significantly the pumping speed.
- the step grid very thin is the seat of depots which can then generate particles harmful to the industrial process carried out in the enclosure.
- the problem proposed by the present invention is to avoid the formation of disturbing deposits of electrical discharges at inside a turbomolecular pump with magnetic bearings or gas connected to an enclosure containing a plasma, without altering significantly the pumping speed or the industrial process to inside the enclosure.
- the invention aims to devise other means which, without intervention of an intermediate grid nor increase sensitive to the temperature of the materials, prevents the formation of disturbing deposits in a turbomolecular step pump magnetic or gaseous connected to a plasma enclosure.
- the invention provides a method for avoiding disturbing deposits of electric shocks between the rotor and the stator inside a multistage turbomolecular pump on bearings magnetic or gaseous; according to this process, at least one is injected suitable location inside the turbomolecular pump a active gas which reacts with the molecules which generate deposits and forms gaseous compounds evacuated by the turbomolecular pump.
- the active gas is injected only into the floors where deposits are likely to occur. Generally, these are the high pressure stages of the pump turbomolecular. In practice, the active gas can be injected into the last turbomolecular stages, and / or in the Holweck stage when the pump is fitted.
- the injected active gas can advantageously be oxygen, or contain oxygen. Indeed, dissociated under the action of electric discharges, the oxygen gas gives rise to highly reactive oxygen atoms which effectively combine with in particular organic residues generated by industrial processes to form molecules volatiles such as carbon monoxide, carbon dioxide or water which are discharged at the same time as the other gaseous compounds originating from the plasma chamber.
- a turbomolecular pump is provided.
- the pump turbomolecular comprises means for injecting, in at least one suitable location inside the turbomolecular pump, an active gas that reacts with the molecules that generate deposits and forms gaseous compounds discharged by the turbomolecular pump.
- the turbomolecular pump according to the invention can advantageously comprise at least one inlet pipe of gas, positioned to bring the active gas between the rotor and the stator in the passage of gas flows in the top floors turbomolecular, and / or in the Holweck stage when the pump in is equipped.
- the turbomolecular pump according to the invention can advantageously be associated with an external source of active gas and to control means for delivering the active gas in quantity sufficient to avoid deposits.
- the turbomolecular pump according to the invention comprises a structure traditional hybrid, with a stator 1 and a rotor 2 with several floors.
- the stator 1 is open upwards according to an entry suction 3, and has a shaped internal recess for receive the rotor 2, with a lower annular volume 4 of collection of pumped gases communicating with a lateral outlet lower delivery 5.
- the stator 1 includes, from suction inlet 3, several stages fixed fins such as stages 6 and 7, followed by a stage of Holweck type stator 8 with an external tubular part 9 of Holweck stator and an internal tubular part 10 of Holweck stator coaxial and joined to each other by the bottom 11 to form between them an annular chimney communicating with the volume lower ring 4.
- the rotor 2 is integral with a shaft 12 carried by magnetic or gas bearings 13 and 14 and stressed in rotation axial in known manner by coils constituting the windings stator and rotor of an electric motor 15.
- the rotor 2 comprises several stages, including several rotor fin stages 16, 17 and 18, followed by a rotor Holweck 19 of tubular shape engaged in the annular chimney between the external tubular part 9 and the internal tubular part 10 of stator Holweck 8.
- the different stages of the turbomolecular pump the invention may have structures such as those traditionally used in turbomolecular pumps.
- turbomolecular pump structure such as illustrated in figure 1, we can consider that the first turbomolecular stages constituted by the stator fins 6 and 7 and the rotor fins 16 and 17 constitute low stages pressure, and that the turbomolecular stage with stator fins 7 and rotor 18 followed by the Holweck stage 8-10 and 19 constitute high pressure stages.
- high pressure stages the distances between the facing surfaces of each other of the stator 1 and rotor 2 are low, and gas pressures are such that the conditions are met for landfills between the rotor 2, electrically isolated and at a floating potential, and stator 1 which is grounded.
- deposits of solids tend to occur on the facing surfaces of stator 1 and rotor 2, in particularly on the surfaces of the high pressure finned stage 7 and 18, and on the Holweck floor 8-10 and 19.
- deposits tend to occur at the interface between the tubular part external 9 of the Holweck stator 8 and the Holweck rotor stage 19 of tubular shape.
- the turbomolecular pump comprises in in addition to means for injecting, in at least one location suitable inside the pump, an active gas capable of react with the molecules that generate deposits to form gaseous compounds discharged by the pump.
- the active gas must be present in the interface zones between the stator 1 and the rotor 2 where deposits are likely to occur.
- the pump comprises at least one gas inlet pipe 20, positioned for bring the active gas between the rotor 2 and the stator 1 in the stages high pressure of the turbomolecular pump.
- a pipe gas inlet 20 brings the active gas to the floors high pressure turbomolecular so that the active gas also propagates in the Holweck stage which follows.
- a gas inlet pipe 20 conducts the gas active at entrance 21 of the Holweck floor, in a higher volume annular, by a branch line 20a.
- the turbomolecular pump illustrated in Figure 1 is associated with an external source of active gas 22 and with means for control 23 to deliver the active gas in just sufficient quantity to avoid deposits that could disrupt pension plans electrical discharges between stator 1 and rotor 2.
- We can in particular control the flow of active gas by a calibrated valve or a micro-leakage valve, in permanent or intermittent operation.
- the active gas can be supplied in one intermediate position along the Holweck floor by a pipe branch 20b, or in the lower volume annular 4 by a pipe branch 20c.
- the invention thus avoids disturbing deposits of electric discharges between rotor 2 and stator 1 inside the multi-turbomolecular pump stages on magnetic or gas bearings 13 and 14 by injecting in at least one suitable location 21 inside the pump a active gas which reacts with the molecules which generate deposits and forms gaseous compounds discharged by the pump.
- the introduction of a gas into the high pressure stages does not does not disturb the atmosphere inside the plasma chamber, and effectively prevents the appearance of deposits likely to disrupt electrical discharge regimes between stator 1 and rotor 2.
- the pumping speed of the system is not disturbed, nor is the temperature of the pump.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Non-Positive Displacement Air Blowers (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Chemical Vapour Deposition (AREA)
Abstract
Description
Claims (10)
- Procédé pour éviter les dépôts perturbateurs des décharges électriques entre le rotor (2) et le stator (1) à l'intérieur d'une pompe turbomoléculaire à plusieurs étages (6, 7, 16-18 ; 8-10, 19) sur paliers magnétiques ou gazeux (13, 14), caractérisé en ce qu'on injecte en au moins un emplacement approprié à l'intérieur de la pompe turbomoléculaire un gaz actif qui réagit avec les molécules génératrices des dépôts et forme des composés gazeux évacués par la pompe turbomoléculaire.
- Procédé selon la revendication 1, caractérisé en ce qu'on choisit un gaz actif qui est dissocié et/ou activé sous l'action des décharges électriques entre le rotor (2) et le stator (1) pour réagir avec les molécules génératrices des dépôts.
- Procédé selon l'une des revendications 1 ou 2, caractérisé en ce qu'on injecte le gaz actif dans les étages haute pression (7, 18 ; 8-10, 19) de la pompe turbomoléculaire.
- Procédé selon la revendication 3, caractérisé en ce qu'on injecte le gaz actif dans les derniers étages turbomoléculaires (7, 18).
- Procédé selon l'une des revendications 3 ou 4, caractérisé en ce qu'on injecte le gaz actif dans l'étage Holweck (8-10, 19) lorsque la pompe en est équipée.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le gaz actif injecté contient de l'oxygène.
- Pompe turbomoléculaire à rotor (2) et stator (1) à plusieurs étages sur paliers magnétiques ou gazeux (13, 14) pour la mise en oeuvre d'un procédé selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'elle comprend des moyens (20) pour injecter, en au moins un emplacement approprié (21) à l'intérieur de la pompe turbomoléculaire, un gaz actif qui réagit avec les molécules génératrices des dépôts et forme des composés gazeux évacués par la pompe turbomoléculaire.
- Pompe turbomoléculaire selon la revendication 7, caractérisée en ce qu'elle comprend au moins une canalisation d'entrée de gaz (20) positionnée pour amener le gaz actif entre le rotor (2) et le stator (1) dans les derniers étages turbomoléculaires (7, 18), et/ou dans l'étage Holweck (8-10, 19) lorsque la pompe en est équipée.
- Pompe turbomoléculaire selon la revendication 8 munie d'un étage Holweck (8-10, 19), caractérisée en ce qu'une canalisation d'entrée de gaz (20) conduit le gaz actif à l'entrée (21) de l'étage Holweck (8-10, 19).
- Pompe turbomoléculaire selon l'une quelconque des revendications 7 à 9, caractérisée en ce qu'elle est associée à une source extérieure de gaz actif (22) et à des moyens de commande (23) pour délivrer le gaz actif en quantité suffisante pour éviter les dépôts entre le rotor (2) et le stator (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9811296A FR2783883B1 (fr) | 1998-09-10 | 1998-09-10 | Procede et dispositif pour eviter les depots dans une pompe turbomoleculaire a palier magnetique ou gazeux |
FR9811296 | 1998-09-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0985828A1 true EP0985828A1 (fr) | 2000-03-15 |
EP0985828B1 EP0985828B1 (fr) | 2005-09-07 |
Family
ID=9530295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99402125A Expired - Lifetime EP0985828B1 (fr) | 1998-09-10 | 1999-08-26 | Procédé et dispositif pour éviter les dépôts dans une pompe turbomoléculaire à palier magnétique ou gazeux |
Country Status (5)
Country | Link |
---|---|
US (1) | US6224326B1 (fr) |
EP (1) | EP0985828B1 (fr) |
AT (1) | ATE304123T1 (fr) |
DE (1) | DE69927101T2 (fr) |
FR (1) | FR2783883B1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007066141A1 (fr) * | 2005-12-09 | 2007-06-14 | Edwards Limited | Procédé visant à inhiber une déflagration dans une pompe à vide |
WO2008022916A1 (fr) | 2006-08-23 | 2008-02-28 | Oerlikon Leybold Vacuum Gmbh | Procédé pour annuler la réaction des poussières autoinflammables dans un dispositif de pompe à vide d'air |
WO2009077777A1 (fr) * | 2007-12-19 | 2009-06-25 | Edwards Limited | Procédé de traitement d'un courant de gaz |
WO2020178042A1 (fr) * | 2019-03-05 | 2020-09-10 | Pfeiffer Vacuum | Pompe à vide turbomoléculaire et procédé de purge |
EP4119795A4 (fr) * | 2020-03-09 | 2024-04-10 | Edwards Japan Limited | Pompe à vide |
EP4212729A4 (fr) * | 2020-09-10 | 2024-08-14 | Edwards Japan Ltd | Pompe à vide |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004036047A1 (fr) | 2002-10-14 | 2004-04-29 | The Boc Group Plc | Pompe a vide a piston rotatif pourvue d'un equipement de lavage |
GB0229356D0 (en) * | 2002-12-17 | 2003-01-22 | Boc Group Plc | Vacuum pumping arrangement |
WO2005028871A1 (fr) * | 2003-09-23 | 2005-03-31 | The Boc Group Plc | Procede de nettoyage d'une pompe a vide a piston rotatif |
US7404698B2 (en) * | 2005-08-16 | 2008-07-29 | Edwards Vacuum, Inc. | Turbomolecular pump with static charge control |
JP5190214B2 (ja) * | 2007-03-29 | 2013-04-24 | 東京エレクトロン株式会社 | ターボ分子ポンプ、基板処理装置、及びターボ分子ポンプの堆積物付着抑制方法 |
DE102008034948A1 (de) * | 2008-07-26 | 2010-01-28 | Pfeiffer Vacuum Gmbh | Vakuumpumpe |
CN102171455B (zh) * | 2008-11-14 | 2014-06-25 | 爱发科低温泵株式会社 | 真空排气装置、真空处理装置以及真空处理方法 |
DE102011119506A1 (de) * | 2011-11-26 | 2013-05-29 | Pfeiffer Vacuum Gmbh | Schnell drehender Rotor für eine Vakuumpumpe |
JP6391171B2 (ja) * | 2015-09-07 | 2018-09-19 | 東芝メモリ株式会社 | 半導体製造システムおよびその運転方法 |
GB2569633A (en) * | 2017-12-21 | 2019-06-26 | Edwards Ltd | A vacuum pumping arrangement and method of cleaning the vacuum pumping arrangement |
JP7224168B2 (ja) | 2017-12-27 | 2023-02-17 | エドワーズ株式会社 | 真空ポンプおよびこれに用いられる固定部品、排気ポート、制御手段 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4512725A (en) * | 1982-02-16 | 1985-04-23 | Compagnie Industrielle Des Telecommunications Cit-Alcatel | Rotary vacuum pump |
EP0408792A1 (fr) * | 1989-07-20 | 1991-01-23 | Leybold Aktiengesellschaft | Pompe à effet visqueux avec au moins un étage hélicoidal à côté du refoulement |
EP0451708A2 (fr) * | 1990-04-06 | 1991-10-16 | Hitachi, Ltd. | Pompe à vide |
EP0695873A1 (fr) * | 1994-08-01 | 1996-02-07 | Balzers-Pfeiffer GmbH | Système de purge pour pompes à vide à paliers magnétiques |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6419198A (en) * | 1987-07-15 | 1989-01-23 | Hitachi Ltd | Vacuum pump |
US5443368A (en) * | 1993-07-16 | 1995-08-22 | Helix Technology Corporation | Turbomolecular pump with valves and integrated electronic controls |
WO1994000694A1 (fr) * | 1992-06-19 | 1994-01-06 | Leybold Aktiengesellschaft | Pompe a vide a gaz et a friction |
IT1281025B1 (it) * | 1995-11-10 | 1998-02-11 | Varian Spa | Pompa turbomolecolare. |
-
1998
- 1998-09-10 FR FR9811296A patent/FR2783883B1/fr not_active Expired - Fee Related
-
1999
- 1999-08-26 AT AT99402125T patent/ATE304123T1/de not_active IP Right Cessation
- 1999-08-26 EP EP99402125A patent/EP0985828B1/fr not_active Expired - Lifetime
- 1999-08-26 DE DE69927101T patent/DE69927101T2/de not_active Expired - Fee Related
- 1999-09-09 US US09/392,586 patent/US6224326B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4512725A (en) * | 1982-02-16 | 1985-04-23 | Compagnie Industrielle Des Telecommunications Cit-Alcatel | Rotary vacuum pump |
EP0408792A1 (fr) * | 1989-07-20 | 1991-01-23 | Leybold Aktiengesellschaft | Pompe à effet visqueux avec au moins un étage hélicoidal à côté du refoulement |
EP0451708A2 (fr) * | 1990-04-06 | 1991-10-16 | Hitachi, Ltd. | Pompe à vide |
EP0695873A1 (fr) * | 1994-08-01 | 1996-02-07 | Balzers-Pfeiffer GmbH | Système de purge pour pompes à vide à paliers magnétiques |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007066141A1 (fr) * | 2005-12-09 | 2007-06-14 | Edwards Limited | Procédé visant à inhiber une déflagration dans une pompe à vide |
WO2008022916A1 (fr) | 2006-08-23 | 2008-02-28 | Oerlikon Leybold Vacuum Gmbh | Procédé pour annuler la réaction des poussières autoinflammables dans un dispositif de pompe à vide d'air |
WO2009077777A1 (fr) * | 2007-12-19 | 2009-06-25 | Edwards Limited | Procédé de traitement d'un courant de gaz |
WO2020178042A1 (fr) * | 2019-03-05 | 2020-09-10 | Pfeiffer Vacuum | Pompe à vide turbomoléculaire et procédé de purge |
FR3093544A1 (fr) * | 2019-03-05 | 2020-09-11 | Pfeiffer Vacuum | Pompe à vide turbomoléculaire et procédé de purge |
CN113518863A (zh) * | 2019-03-05 | 2021-10-19 | 普发真空公司 | 涡轮分子真空泵和净化方法 |
EP4119795A4 (fr) * | 2020-03-09 | 2024-04-10 | Edwards Japan Limited | Pompe à vide |
EP4212729A4 (fr) * | 2020-09-10 | 2024-08-14 | Edwards Japan Ltd | Pompe à vide |
Also Published As
Publication number | Publication date |
---|---|
DE69927101T2 (de) | 2006-06-29 |
FR2783883B1 (fr) | 2000-11-10 |
ATE304123T1 (de) | 2005-09-15 |
DE69927101D1 (de) | 2005-10-13 |
US6224326B1 (en) | 2001-05-01 |
EP0985828B1 (fr) | 2005-09-07 |
FR2783883A1 (fr) | 2000-03-31 |
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