EP1200739A1 - Pompe a vide a friction avec elements actifs de pompage - Google Patents

Pompe a vide a friction avec elements actifs de pompage

Info

Publication number
EP1200739A1
EP1200739A1 EP00956198A EP00956198A EP1200739A1 EP 1200739 A1 EP1200739 A1 EP 1200739A1 EP 00956198 A EP00956198 A EP 00956198A EP 00956198 A EP00956198 A EP 00956198A EP 1200739 A1 EP1200739 A1 EP 1200739A1
Authority
EP
European Patent Office
Prior art keywords
vacuum pump
stator
blades
friction vacuum
section
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.)
Withdrawn
Application number
EP00956198A
Other languages
German (de)
English (en)
Inventor
Christian Beyer
Ralf Adamietz
Günter Schütz
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 EP1200739A1 publication Critical patent/EP1200739A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a friction vacuum pump with pump-active elements that protrude into a pumping chamber with a decreasing cross-section in the direction of the pump outlet and consist of rows of stator and rotor blades, the blades being attached to the ring surfaces facing the pumping chamber.
  • the annular cross section of the scooping space decreases step-by-step from the inlet to the outlet.
  • the gases pumped in the area of the stator and rotor blades have a molecular flow behavior.
  • the annular surfaces of the steps facing the inlet side therefore represent abutting surfaces which increase the proportion of those molecules which have a movement component directed against the conveying direction. These abutting surfaces affect the performance data of the friction vacuum pump.
  • the present invention has for its object to improve the pump properties (pumping speed, compressions) of a friction vacuum pump of the type mentioned.
  • the rotor blade or rotor blade rows are components of the rotor which is essentially made in one piece and which has a stepped cylindrical rotor outer surface in the pump according to the prior art.
  • the invention is realized in that the shape of the rotor outer surface facing the scoop is adapted to the decreasing cross section of the scoop. This expediently applies not only to the annular surfaces which carry the rotor blades, but also to the annular outer rotor surfaces which extend between the rows of rotor blades.
  • the end faces of the stator blades, which extend to the rotor outer surface are adapted to the special shape of the rotor outer surface.
  • stator rings or stator half rings
  • the rows of stator blades are expediently part of stator rings (or stator half rings), which consist of two central rings (or ring halves) between which the blades extend.
  • the two rings each have mutually facing ring surfaces, which carry the blades located between them.
  • These ring surfaces are expediently designed to be inclined in such a way that the desired goal - adaptation to the decreasing delivery cross section in the direction of the outlet - is achieved.
  • the invention can be used particularly advantageously in a friction pump in which a first high-vacuum turbomolecular pump stage is followed by a second molecular pump stage located on the fore-vacuum side.
  • a friction pump in which a first high-vacuum turbomolecular pump stage is followed by a second molecular pump stage located on the fore-vacuum side.
  • the transition from the turbomolecular pump stage to the molecular pump stage or from molecular to viscous flow is critical.
  • the invention in the area of the fore-vacuum blade row (filling stage), not only an effectively acting delivery channel is realized; the invention also allows the delivery channel to be deflected radially, which is necessary if e.g. the ring channel of the molecular pump stage has a larger diameter than the outer diameter of the pump chamber of the turbomolecular pump stage.
  • FIG. 1 shows a partial section through a friction vacuum pump according to the invention
  • FIG. 2 shows the view of an inner ring surface of a stator blade ring
  • FIGS. 3 and 4 sections through the blade ring according to FIG. 2 with different designs of the inner ring surface and the blades,
  • FIG. 5 shows a further embodiment for a row of stator blades
  • Figure 6 is a plan view of a stator half ring with an outer and an inner ring and
  • the friction vacuum pump 1 shown in FIG. 1 comprises a base part 2, a housing 3, a stator 4 and a rotor 5.
  • the axis of the pump is denoted by 6.
  • the pump 1 On the inlet side (inlet 7), the pump 1 is equipped with a turbomolecular pump stage which comprises alternating rotor blade rows 8 to 12 and stator blade rows 14 to 18.
  • the turbomolecular pump stage is followed by a molecular pump stage which consists of a rotating pipe section 21 and a stator-side thread 22 (Holweck pump).
  • Holweck pump Depending on whether the delivery channel of the molecular pump stage on ends of the rotor section 21 or continues on its rear side, the outlet 23 of the pump 1 is arranged differently (arrows 23, 23 ')
  • the rotor blade rows 8 to 12 are components of the one-piece rotor 5. Circumferential ring surfaces each carry the blades of the respective blade rows.
  • the stator blade rows 14 to 18 each have outer rings which are approximately rectangular in cross section and which, together with spacer rings 24, form the stator 4 centered by the housing 3.
  • the scoop of the friction pump 1 is designated 25. Its annular cross section decreases from the inlet 7 to the lower end of the tube section 21.
  • the rotor outer surface and / or the stator inner surface are modified according to the invention. There are various possibilities for this, some of which are shown in FIGS. 1 to 10.
  • the rotor blade rows 8, 11 and 12 are solutions according to the prior art.
  • the ring surfaces of the rotor, which carry the rotor blades, are cylindrical; the outer end faces of the rotor blades are also on a cylinder surface.
  • the outside of the rotor has a conical shape corresponding to the decrease in the cross section of the suction chamber. This shape also has the ring surface of the rotor outside, which is located at the level of the stator blade row 14.
  • Figures 2 to 5 show different variants of stator blade rings, which consist of an outer ring and each of the blade rows carried by it.
  • Figure 2 shows a view of the inner surface of the outer ring (development) from which the blades protrude.
  • Figure 3 shows a solution according to the prior art.
  • the inside of the annular surface 31 of the outer ring 32 is cylindrical. This also applies to the position of the inner end faces 33 of the blades 34.
  • FIGS. 4a and 4b show designs in which the inner surface 35 of the outer ring 36 has a conical shape. This also applies to the end faces 37 of the blades 38, which are adapted to the conical shape of the rotor outside. By means of different angles of inclination it can be achieved that the scoop chamber 25 has a continuously decreasing delivery cross section.
  • the difference between the embodiments according to FIGS. 4a and 4b is that the radius of the conveying cross section increases in the embodiment according to FIG. 4a, while it decreases in the solution according to FIG. 4b.
  • FIG. 5 shows an exemplary embodiment of a stator blade ring with a stator blade row 41 and an outer support ring 42, the radial dimension of which decreases discontinuously in the conveying direction.
  • the decisive factor is the design of the inner surface 43, which has a cylindrical shape on the inlet side and is equipped on the outlet side with a recess 44 corresponding approximately to the shape of a quarter circle.
  • the end faces 45 of the blades of the blade row 41 also lie on a conical surface which is adapted to the outside of the rotor.
  • FIG. 6 shows a stator half ring with an outer ring 51 and an inner ring 52, between which there is a row of blades.
  • the enlarged sectional view according to FIG. 7 shows a solution according to the prior art.
  • the inner surface 53 of the outer ring 51 and the outer surface 54 of the inner ring 52, which carry the row of blades 55, are cylindrical.
  • the solution according to FIG. 8 has an outer ring 56 with a cylindrical inner surface 57 and an inner ring 58 with a conical outer surface 59.
  • the row of blades located between them is designated 60.
  • This design corresponds to the design of the stator show Feiringe 15, 16 and 17 of the friction vacuum pump 1 according to Figure 1.
  • FIGS. 9 and 10 show solutions which, like the embodiments according to FIGS. 4a, 4b and 5, in addition to achieving the desired decrease in the delivery cross section of the scooping chamber 25, also allow a radial deflection of the delivery flow, so that they are particularly useful as filling stages for the molecular pump stage are suitable.
  • Both the inner surface 61 of the outer ring 62 and the outer surface 63 of the inner ring 64, which carry the row of blades 65, are inclined in such a way that the delivery flow is directed radially inwards.
  • the inner surface 6b of the outer ring 67 and the outer surface 68 of the inner ring 69 are inclined in a different direction compared to the embodiment according to FIG. 9, so that the delivery flow is deflected radially outwards.
  • This embodiment corresponds to the design of the blade row 18 in the pump 1 according to FIG. 1.

Landscapes

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

Abstract

L'invention concerne une pompe à vide à friction (1) comportant des éléments actifs de pompage qui forment des saillies vers l'intérieur d'une chambre d'aspiration (25), saillies dont les sections décroissent en direction de l'échappement de la pompe, et qui sont constitués par des séries de palettes de stator et de rotor, les palettes étant fixées sur des surfaces annulaires tournées vers la chambre d'aspiration (25). En vue d'améliorer les propriétés de la pompe, l'invention est caractérisée en ce que la forme d'au moins une partie des surfaces annulaires est adaptée à la diminution de la section transversale de transfert de la chambre d'aspiration (25).
EP00956198A 1999-08-07 2000-07-18 Pompe a vide a friction avec elements actifs de pompage Withdrawn EP1200739A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19937392 1999-08-07
DE1999137392 DE19937392A1 (de) 1999-08-07 1999-08-07 Reibungsvakuumpumpe mit pumpaktiven Elementen
PCT/EP2000/006846 WO2001011240A1 (fr) 1999-08-07 2000-07-18 Pompe a vide a friction avec elements actifs de pompage

Publications (1)

Publication Number Publication Date
EP1200739A1 true EP1200739A1 (fr) 2002-05-02

Family

ID=7917611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956198A Withdrawn EP1200739A1 (fr) 1999-08-07 2000-07-18 Pompe a vide a friction avec elements actifs de pompage

Country Status (4)

Country Link
EP (1) EP1200739A1 (fr)
JP (1) JP2003506630A (fr)
DE (1) DE19937392A1 (fr)
WO (1) WO2001011240A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10142567A1 (de) * 2001-08-30 2003-03-20 Pfeiffer Vacuum Gmbh Turbomolekularpumpe
GB0229355D0 (en) 2002-12-17 2003-01-22 Boc Group Plc Vacuum pumping arrangement
DE102005008643A1 (de) * 2005-02-25 2006-08-31 Leybold Vacuum Gmbh Holweck-Vakuumpumpe
JP5115627B2 (ja) * 2008-06-19 2013-01-09 株式会社島津製作所 ターボ分子ポンプ
JP5767636B2 (ja) * 2010-07-02 2015-08-19 エドワーズ株式会社 真空ポンプ
JP6882624B2 (ja) * 2017-09-25 2021-06-02 株式会社島津製作所 ターボ分子ポンプ
JP2022035881A (ja) * 2020-08-21 2022-03-04 エドワーズ株式会社 真空ポンプ、固定翼、およびスペーサ

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2231654A1 (de) * 1972-06-28 1974-01-17 Leybold Heraeus Gmbh & Co Kg Turbomolekularpumpe
JPS61283794A (ja) * 1985-06-10 1986-12-13 Nippon Soken Inc タ−ボ分子ポンプ
JPS62203995A (ja) * 1986-03-04 1987-09-08 Anelva Corp 真空装置
JPH02502840A (ja) * 1988-01-05 1990-09-06 ショロホフ　ヴァレリイ　ボリソヴィチ 分子真空ポンプ
GB2226603B (en) * 1988-02-26 1992-07-29 Nikolai Mikhailovich Novikov Turbomolecular vacuum pump
US5020969A (en) * 1988-09-28 1991-06-04 Hitachi, Ltd. Turbo vacuum pump
JPH04246288A (ja) * 1991-01-31 1992-09-02 Fujitsu Ltd 真空ドライポンプ
DE4438812A1 (de) * 1994-10-31 1996-05-02 Leybold Ag Reibungsvakuumpumpe mit Kühlung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0111240A1 *

Also Published As

Publication number Publication date
JP2003506630A (ja) 2003-02-18
DE19937392A1 (de) 2001-02-08
WO2001011240A1 (fr) 2001-02-15

Similar Documents

Publication Publication Date Title
EP0614014B1 (fr) Compresseur radial avec un carter stabilisant l'écoulement de fluides
DE69729686T2 (de) Vakuumpumpe
WO1994025760A1 (fr) Pompe a vide rotative a friction comportant des sections de conception differente
EP1252445B1 (fr) Pompe turbo-moléculaire
DE4216237A1 (de) Gasreibungsvakuumpumpe
DE60203214T2 (de) Turbinenschaufel mit Labyrinthschneidendichtung
WO2008046389A1 (fr) Ensemble influençant un écoulement au moyen de géométries qui influencent la couche limite
DE102009035332A1 (de) Vakuumpumpe
EP1017944B1 (fr) Pompe compound
DE102012003680A1 (de) Vakuumpumpe
WO2016110373A1 (fr) Soufflante à canal latéral pour un moteur à combustion interne
EP0363503B1 (fr) Etage de pompage pour une pompe à vide élevé
EP1200739A1 (fr) Pompe a vide a friction avec elements actifs de pompage
DE10008691B4 (de) Gasreibungspumpe
EP2933497A2 (fr) Pompe à vide
EP0825346B1 (fr) Etage d'entrée pour une pompe à gaz à friction à double flux
WO2000020762A1 (fr) Pompe a vide a friction avec stator et rotor
EP1319131B1 (fr) Pompe a vide a friction composee
DE10224604B4 (de) Evakuierungseinrichtung
EP3608545A1 (fr) Pompe à vide
EP3032107A2 (fr) Pompe turbomoleculaire
EP3577346B1 (fr) Turbocompresseur pourvu de canaux d'écoulement intégrés
DE10124339A1 (de) Rotorscheiben mit Schaufeln für eine Turbomolekularpumpe
WO2013060754A2 (fr) Compresseur annulaire de liquides
DE1403833A1 (de) Kreiselpumpe

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20011224

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

17Q First examination report despatched

Effective date: 20021128

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20030609

RBV Designated contracting states (corrected)

Designated state(s): DE FR GB IT