EP0640185B1 - Pompe a friction a vide a gaz - Google Patents

Pompe a friction a vide a gaz Download PDF

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Publication number
EP0640185B1
EP0640185B1 EP93911777A EP93911777A EP0640185B1 EP 0640185 B1 EP0640185 B1 EP 0640185B1 EP 93911777 A EP93911777 A EP 93911777A EP 93911777 A EP93911777 A EP 93911777A EP 0640185 B1 EP0640185 B1 EP 0640185B1
Authority
EP
European Patent Office
Prior art keywords
pump
rotor
section
stage
gas
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.)
Expired - Lifetime
Application number
EP93911777A
Other languages
German (de)
English (en)
Other versions
EP0640185A1 (fr
Inventor
Hans-Peter Kabelitz
Martin Mühlhoff
Hans Kriechel
Frank Fleischmann
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.)
Balzers und Leybold Deutschland Holding AG
Original Assignee
Leybold AG
Balzers und Leybold Deutschland Holding AG
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 AG, Balzers und Leybold Deutschland Holding AG filed Critical Leybold AG
Publication of EP0640185A1 publication Critical patent/EP0640185A1/fr
Application granted granted Critical
Publication of EP0640185B1 publication Critical patent/EP0640185B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • 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
    • F04D19/044—Holweck-type 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
    • 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 gas friction vacuum pump with differently designed pump stages, each comprising a rotor section and a stator section.
  • Friction pumps include molecular and turbomolecular vacuum pumps.
  • a moving rotor wall and a stationary stator wall are designed and spaced apart such that the impulses transmitted from the walls to gas molecules located between them have a preferred direction.
  • the rotor and / or stator wall are equipped with thread-like depressions or projections.
  • Turbomolecular vacuum pumps have interlocking rows of stator and rotor blades in the manner of a turbine.
  • Turbomolecular pumps have a relatively low compression (pressure ratio of pressure-side pressure to suction-side pressure) and a relatively high pumping speed (pump speed, volume flow per unit of time). Their manufacture and assembly is complex and expensive. In addition, they require a backing pressure of around 10 ⁇ 2 mbar. Molecular pumps also have a relatively high compression, but their pumping speed is relatively small. They pump up to pressures of 10 mbar and more, so that the effort required for the pre-vacuum generation is less than with turbomolecular pumps. It is therefore known to equip gas friction vacuum pumps with differently designed pump stages, the pump stage on the fore-vacuum side generally being a molecular pump stage because of the better fore-vacuum resistance.
  • the present invention has for its object to design a gas friction vacuum pump with differently designed pump stages in such a way that it can be easily adapted to different applications.
  • the proposed measures have the advantage that the final pressure behavior of the pump can be influenced in a staggered manner by simple variations of the rotor and stator components. For example, it is possible to significantly influence the pump properties of the entire pump by means of modular turbomolecular pump stages that can be placed on a molecular pump stage. The basic structure of the downstream molecular pump is not affected.
  • the friction pump 1 shown in FIG. 1 has a first housing section 2. Part of this first Housing section 2 is the outer cylinder 3, which is equipped with the flange 4. With the help of the flange 4, the friction pump 1 can be connected either directly or via a reducer 5 with the flanges 6 and 7 to the recipient to be evacuated.
  • the reducer 5 is required if the flange 4 of the pump 1 has a smaller or larger diameter than the flange of the recipient, not shown.
  • the rotor 9 is bell-shaped. It comprises the shaft 10 with its axis of rotation 8, the hub 11 and the cylindrical section 12.
  • the drive motor 14 and at least the upper bearing of the two rotor bearings 15 are located within the space 13 formed by the bell-shaped rotor 9.
  • the motor 14 and the rotor bearings 15 are supported on the component 16 fixed to the housing.
  • the outside of the bell-shaped rotor 9 forms, together with the inside of the outer cylinder 3, the pumping surfaces of a molecular pump stage 3, 12 or the annular gas delivery channel 20.
  • the inside of the Housing cylinder 3 separate rings 17, 18, 19 may be provided.
  • the gases to be pumped are conveyed from the inlet 21 to the outlet, not shown.
  • a forevacuum pump, also not shown, is connected to the outlet during operation.
  • the rotor 9 In the area of the hub 11 on the high vacuum side, the rotor 9 is designed conically in such a way that its diameter increases in the direction of flow. A smooth inner surface of the outer cylinder 3 or the associated ring 17 is assigned to this area. Structures 22 serving for gas production are provided on the rotor 9 itself. For example, they can be designed as radial webs, the width of which decreases in the direction of flow, so that the molecular pump stage 3, 12 has an inlet stage 17, 22 with improved delivery capacity.
  • the rotor 9 is fastened by means of a screw 23 in the region of the high-vacuum end of the shaft 10.
  • the end face of the rotor 9 is equipped with a circular projection 25 which is concentric with the axis of rotation 8.
  • This projection 25 is a component of centering means which are provided both on the rotor 9 and on the further rotor sections to be fastened on the end face of the rotor 9.
  • the molecular pump stage 3, 12 is preceded by a turbomolecular pump stage 26.
  • This consists of the rotor section 27 with its rotor blades 28 and the housing section 29 with its stator blades 30.
  • the end face of the rotor section 27 facing the rotor 9 is provided with a recess 31 (centering means) which is concentric with the axis of rotation 8.
  • the diameter of this recess corresponds to the outer diameter of the circular projection 25 on the end face of the rotor 9, as a result of which the desired centering with respect to the axis of rotation 8 is achieved.
  • the housing section 29 is equipped with the flanges 32 and 33.
  • the turbomolecular pump stage 26 is attached to the flange 4 of the molecular pump stage 3, 12.
  • Either the recipient to be evacuated or the reducer 5 is mounted on the flange 33.
  • the fastening of the rotor section 27 to the rotor 9 of the molecular pump stage expediently serves screws 34 which axially penetrate the rotor section 27 and are screwed into the end face of the rotor 9.
  • the position of the screws is indicated by dash-dotted lines 34.
  • the molecular pump stage 3, 12 is preceded by a special friction pump stage (filling stage 35), the housing section 36 of which has a smooth inner surface.
  • the rotor section 37 is designed as described in EP-A 363 503.
  • the rotor section 37 comprises a central part 38 and webs 39.
  • the webs form the structures which effect the gas delivery. Their width and their slope decrease from the suction side to the pressure side. This requires a conical design of the central part 38. It is particularly expedient if the taper of the hub 11 of the rotor 9 of the molecular pump stage 3, 12 continuously adjoins the taper of the central part 38 of the rotor section 37.
  • the housing section 36 On the fore-vacuum side, the housing section 36 is equipped with the flange 41, which is connected to the flange 4 of the molecular pump stage 3, 12. On the inlet side, the reducer 5 closes welded to a component. Of course, there is also the possibility of connecting the housing section 36 and the reducer 5 to one another via flanges. A reducer 5 according to FIG. 2 is then to be used together with a filling stage 35 according to FIG. 4.
  • a turbomolecular pump stage 26 and a filling stage 35 are arranged upstream of the molecular pump stage 3, 12 in the direction of flow.
  • the associated housing sections 3, 36, 29 are connected via flanges.
  • the rotor sections 9, 37, 27 are connected in the manner described for FIG. 2.
  • the respective centering means are appropriately equipped with identical diameters, so that the desired modular structure is possible. If two further pump stages are located upstream of the molecular pump stage 3, 12, then it is only necessary to use longer fastening screws 34 to fasten the two rotor sections.

Abstract

La présente invention concerne une pompe à friction à vide à gaz (1) comportant au moins deux étages (3, 12; 26; 35) dont chacun possède une section rotor (9, 27, 37) et une section boîtier (3, 29, 36); afin de pouvoir adapter la pompe à différents types d'utilisation, il est proposé que différents étages d'entrée puissent être montés sur le côté à vide très poussé et que les étages puissent être fixés ensemble de façon libérable.

Claims (7)

  1. Pompe à vide à friction à gaz (1) comportant plusieurs étages de pompe (3, 12 ; 26, 35) de configuration différente, qui comprennent chacun un tronçon de rotor (9, 27, 37) et un tronçon de boîtier (3, 29, 36), caractérisée en ce qu'il est prévu trois étages de pompe (3, 12 ; 26 ; 35) de configuration différente, en ce qu'un étage de pompe (3, 12) du côté vide préliminaire est précédé, du côté vide poussé, d'un étage de chargement comportant un stator (36) et un rotor (38), le rotor (38) étant pourvu d'une structure effectuant l'acheminement des gaz, qui est constituée par des voiles (39) radiaux, dont la pente et la largeur décroissent depuis le côté aspiration vers le côté refoulement, en ce que l'étage de chargement (35) est lui-même précédé d'un étage de pompe turbomoléculaire (26), et en ce que les trois étages (3, 12 ; 26 ; 35) de pompe sont reliés les uns aux autres de manière détachable.
  2. Pompe selon la revendication 1, caractérisée en ce qu'un tronçon (12) essentiellement cylindrique du rotor (9) et un tronçon de boîtier (3) essentiellement cylindrique forment un étage de pompe moléculaire du côté du vide préliminaire, avec un canal (20) de section annulaire d'acheminement des gaz.
  3. Pompe selon la revendication 2, caractérisée en ce que le tronçon du rotor (9) situé du côté du vide poussé est réalisé conique avec un diamètre croissant en direction d'écoulement (moyeu 11) et en ce qu'il porte dans son tronçon conique des structures (22) servant à l'acheminement des gaz.
  4. Pompe selon la revendication 1, 2 ou 3, caractérisée en ce que l'étage de chargement (35) présente une partie centrale (38) qui est réalisée avec un diamètre croissant en direction d'écoulement.
  5. Pompe selon la revendication 4, caractérisée en ce que la conicité du moyeu (11) du rotor (9) se raccorde de manière continue à la conicité de la partie centrale (38) de l'étage de chargement (35).
  6. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que les faces frontales orientées l'une vers l'autre des tronçons de rotor (9, 27, 37) à relier les uns aux autres de manière détachable sont équipés de moyens de centrage (25, 31).
  7. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le tronçon de boîtier (29, 36) de l'étage de pompe (26, 35) agencé du côté du vide poussé est réalisé d'une seule pièce avec une pièce de réduction (5).
EP93911777A 1992-05-16 1993-04-23 Pompe a friction a vide a gaz Expired - Lifetime EP0640185B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4216237 1992-05-16
DE4216237A DE4216237A1 (de) 1992-05-16 1992-05-16 Gasreibungsvakuumpumpe
PCT/EP1993/000984 WO1993023672A1 (fr) 1992-05-16 1993-04-23 Pompe a friction a vide a gaz

Publications (2)

Publication Number Publication Date
EP0640185A1 EP0640185A1 (fr) 1995-03-01
EP0640185B1 true EP0640185B1 (fr) 1995-11-15

Family

ID=6459056

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93911777A Expired - Lifetime EP0640185B1 (fr) 1992-05-16 1993-04-23 Pompe a friction a vide a gaz

Country Status (5)

Country Link
US (1) US5553998A (fr)
EP (1) EP0640185B1 (fr)
JP (1) JPH07506648A (fr)
DE (2) DE4216237A1 (fr)
WO (1) WO1993023672A1 (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216237A1 (de) * 1992-05-16 1993-11-18 Leybold Ag Gasreibungsvakuumpumpe
JPH0886298A (ja) * 1994-09-19 1996-04-02 Hitachi Ltd ドライターボ真空ポンプ
GB9525337D0 (en) * 1995-12-12 1996-02-14 Boc Group Plc Improvements in vacuum pumps
DE19632874A1 (de) * 1996-08-16 1998-02-19 Leybold Vakuum Gmbh Reibungsvakuumpumpe
DE29717079U1 (de) 1997-09-24 1997-11-06 Leybold Vakuum Gmbh Compoundpumpe
US6457954B1 (en) * 1998-05-26 2002-10-01 Leybold Vakuum Gmbh Frictional vacuum pump with chassis, rotor, housing and device fitted with such a frictional vacuum pump
JP3092063B2 (ja) * 1998-06-17 2000-09-25 セイコー精機株式会社 ターボ分子ポンプ
US6328527B1 (en) * 1999-01-08 2001-12-11 Fantom Technologies Inc. Prandtl layer turbine
JP3788558B2 (ja) 1999-03-23 2006-06-21 株式会社荏原製作所 ターボ分子ポンプ
JP3961155B2 (ja) * 1999-05-28 2007-08-22 Ｂｏｃエドワーズ株式会社 真空ポンプ
US6514035B2 (en) * 2000-01-07 2003-02-04 Kashiyama Kougyou Industry Co., Ltd. Multiple-type pump
DE10008691B4 (de) * 2000-02-24 2017-10-26 Pfeiffer Vacuum Gmbh Gasreibungspumpe
DE10111546A1 (de) 2000-05-15 2002-01-03 Pfeiffer Vacuum Gmbh Gasreibungspumpe
JP5149472B2 (ja) * 2000-05-15 2013-02-20 プファイファー・ヴァキューム・ゲーエムベーハー ガス摩擦ポンプ
DE10046766A1 (de) * 2000-09-21 2002-04-11 Leybold Vakuum Gmbh Compound-Reibungsvakuumpumpe
DE10056144A1 (de) * 2000-11-13 2002-05-23 Pfeiffer Vacuum Gmbh Gasreibungspumpe
US7717684B2 (en) * 2003-08-21 2010-05-18 Ebara Corporation Turbo vacuum pump and semiconductor manufacturing apparatus having the same
GB0322883D0 (en) * 2003-09-30 2003-10-29 Boc Group Plc Vacuum pump
GB0503946D0 (en) * 2005-02-25 2005-04-06 Boc Group Plc Vacuum pump
US7457661B2 (en) * 2005-03-24 2008-11-25 Medtronic Vascular, Inc. Catheter-based, dual coil photopolymerization system
US7326034B2 (en) * 2005-09-14 2008-02-05 Schlumberger Technology Corporation Pump apparatus and methods of making and using same
US7845413B2 (en) 2006-06-02 2010-12-07 Schlumberger Technology Corporation Method of pumping an oilfield fluid and split stream oilfield pumping systems
JP5369591B2 (ja) 2008-10-03 2013-12-18 株式会社島津製作所 ターボ分子ポンプ
US8152442B2 (en) * 2008-12-24 2012-04-10 Agilent Technologies, Inc. Centripetal pumping stage and vacuum pump incorporating such pumping stage
US9061095B2 (en) 2010-04-27 2015-06-23 Smith & Nephew Plc Wound dressing and method of use
US11274671B2 (en) * 2011-09-14 2022-03-15 Roger L. Bottomfield Turbine cap for turbo-molecular pump
JP6706553B2 (ja) * 2015-12-15 2020-06-10 エドワーズ株式会社 真空ポンプ及び該真空ポンプに搭載される回転翼、反射機構
JP6885851B2 (ja) * 2017-10-27 2021-06-16 エドワーズ株式会社 真空ポンプ、ロータ、ロータフィン、およびケーシング
GB2592618A (en) * 2020-03-03 2021-09-08 Edwards Ltd Turbine blades and methods of manufacture of turbine blades

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FR2224009A5 (fr) * 1973-03-30 1974-10-25 Cit Alcatel
US4579508A (en) * 1982-04-21 1986-04-01 Hitachi, Ltd. Turbomolecular pump
JPS6034594U (ja) * 1983-08-16 1985-03-09 セイコー精機株式会社 縦型タ−ボ分子ポンプ
JPS60182394A (ja) * 1984-02-29 1985-09-17 Shimadzu Corp タ−ボ分子ポンプ
US4732529A (en) * 1984-02-29 1988-03-22 Shimadzu Corporation Turbomolecular pump
DE3410905A1 (de) * 1984-03-24 1985-10-03 Leybold-Heraeus GmbH, 5000 Köln Einrichtung zur foerderung von gasen bei subatmosphaerischen druecken
DE3613344A1 (de) * 1986-04-19 1987-10-22 Pfeiffer Vakuumtechnik Turbomolekular-vakuumpumpe fuer hoeheren druck
JPS6341695A (ja) * 1986-08-07 1988-02-22 Seiko Seiki Co Ltd タ−ボ分子ポンプ
JPS6385288A (ja) * 1986-09-29 1988-04-15 Hitachi Ltd 真空ポンプ
JPS6463698A (en) * 1987-09-02 1989-03-09 Hitachi Ltd Turbo vacuum pump
WO1989006320A1 (fr) * 1988-01-05 1989-07-13 Sholokhov Valery B Pompe a vide moleculaire
DE3885899D1 (de) * 1988-10-10 1994-01-05 Leybold Ag Pumpenstufe für eine Hochvakuumpumpe.
EP0408791B1 (fr) * 1989-07-20 1994-03-16 Leybold Aktiengesellschaft Pompe à effet visqueux à rotor en forme de cloche
DE58905785D1 (de) * 1989-07-20 1993-11-04 Leybold Ag Gasreibungspumpe mit mindestens einer auslassseitigen gewindestufe.
DE4216237A1 (de) * 1992-05-16 1993-11-18 Leybold Ag Gasreibungsvakuumpumpe

Also Published As

Publication number Publication date
WO1993023672A1 (fr) 1993-11-25
DE4216237A1 (de) 1993-11-18
US5553998A (en) 1996-09-10
JPH07506648A (ja) 1995-07-20
DE59300970D1 (de) 1995-12-21
EP0640185A1 (fr) 1995-03-01

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