EP 0363503 B1 19931124 - Pump stage for a high vacuum pump.
Title (en)
Pump stage for a high vacuum pump.
Title (de)
Pumpenstufe für eine Hochvakuumpumpe.
Title (fr)
Etage de pompage pour une pompe à vide élevé.
Publication
Application
Priority
EP 88116749 A 19881010
Abstract (en)
[origin: JPH02149798A] PURPOSE: To raise compressibility and increase suction performance when pressure at a suction side is relatively high by decreasing the tilting angle and width of radially extending webs from the suction side to a discharge side. CONSTITUTION: A web 24 has a tilting angle α of about 45 deg.. The width b1 of the web 24 is about 1/3 of a radius (r). In this case, the radius (r) is, for example, 50-60 mm. An annular surface (gas inlet surface) specified by the width b1 of the web 24 in accordance with that dimension ratio is larger than 50% of a rotor end surface. The web 24 at the discharge side has a tilting angle βof about 15 deg., and a width b2 of about 1/10 of the radius (r). Nineteen webs 24, for example, are arranged on the outer periphery of a tapered boss 23 in an equally spaced manner. Each of these webs 24 extends across an angle γrespectively. This angle is preferably 90 deg..
IPC 1-7
IPC 8 full level
F04D 19/04 (2006.01)
CPC (source: EP US)
F04D 19/046 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0363503 A1 19900418; EP 0363503 B1 19931124; DE 3885899 D1 19940105; JP 3048583 B2 20000605; JP H02149798 A 19900608; US 4978276 A 19901218
DOCDB simple family (application)
EP 88116749 A 19881010; DE 3885899 T 19881010; JP 26231189 A 19891009; US 41919489 A 19891010