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1. (WO2010074967) CENTRIPETAL PUMPING STAGE AND VACUUM PUMP INCORPORATING SUCH PUMPING STAGE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2010/074967 International Application No.: PCT/US2009/067196
Publication Date: 01.07.2010 International Filing Date: 08.12.2009
IPC:
F04C 18/02 (2006.01) ,F04C 2/02 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
18
Rotary-piston pumps specially adapted for elastic fluids
02
of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
2
Rotary-piston machines or pumps
02
of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
Applicants:
AGILENT TECHNOLOGIES, INC. [US/US]; CPA Global P.O. Box 52050 Minneapolis, MN 55402, US (AllExceptUS)
HELMER, John, C. [US/US]; US (UsOnly)
GIORS, Silvio [IT/IT]; IT (UsOnly)
Inventors:
HELMER, John, C.; US
GIORS, Silvio; IT
Agent:
IMPERATO, John, L.; Agilent Technologies, Inc. CPA Global P.O. Box 52050 Minneapolis, MN 55402, US
Priority Data:
12/343,96124.12.2008US
Title (EN) CENTRIPETAL PUMPING STAGE AND VACUUM PUMP INCORPORATING SUCH PUMPING STAGE
(FR) ÉTAGE DE POMPAGE CENTRIPÈTE ET POMPE À VIDE INTÉGRANT UN TEL ÉTAGE DE POMPAGE
Abstract:
(EN) A molecular spiral-type vacuum pumping stage comprises a rotor disk having smooth surfaces cooperating with a stator. The stator is provided with a plurality of spiral channels at least on the surface facing the rotor disk, wherein the gas to be pumped flows in centripetal direction. The cross-section area (σ) of the channels is reduced from the center towards the outer periphery of the stator. Due to this arrangement, it is possible to avoid the reduction of the internal gas flow velocity along the pumping stage and the related risk of internal compression or re-expansions, this limiting the power losses. The present invention also refers to a vacuum pump comprising at least one pumping stage as described above.
(FR) On décrit un étage de pompe à vide moléculaire de type spiral comportant un disque de rotor présentant des surfaces lisses, coopérant avec un stator. Le stator est muni d'une pluralité de canaux en spirale au moins sur la surface faisant face au disque de rotor, le gaz à pomper s'écoulant dans la direction centripète. L'aire en section droite (σ) des canaux se réduit en allant du centre vers la périphérie extérieure du stator. En raison de cette disposition, il est possible d'éviter la réduction de la vitesse d'écoulement interne du gaz le long de l'étage de pompage et le risque associé de compression ou de détentes réitérées internes, limitant ainsi les pertes de puissance. La présente invention concerne également une pompe à vide comportant au moins un étage de pompage tel que décrit ci-dessus.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
CN102265036DE112009004055