EP 1199476 A2 20020424 - Vacuum pump
Title (en)
Vacuum pump
Title (de)
Vakuumpumpe
Title (fr)
Pompe à vide
Publication
Application
Priority
JP 2000314966 A 20001016
Abstract (en)
Passage structure for a vacuum pump has a rotary shaft, a gas transferring assembly and a backflow preventing means. The gas transferring assembly is driven based on rotation of the rotary shaft. Vacuum action is generated by transferring gas due to motion of the gas transferring assembly. The backflow preventing means is constituted of a guide pipe, a valve hole forming portion, a valve body and a return spring, and is interposed in a gas passage. The guide pipe accommodates the valve body and the return spring, and forms a tapered valve hole. The valve body is constituted of a shutter closing the valve hole, a cylindrical circumferential wall, a plurality of slide contact portions disposed on an outer circumferential surface of the circumferential wall so as to be distributed around the inner circumferential surface of the guide pipe, and a seal ring fitted to a periphery of the shutter. The valve body opens and closes the valve hole. The return spring urges the valve body in a direction to close the valve hole. A plurality of the slide contact portions keeps in slide contact with one of the guide pipe and the valve body, and is interposed between an inner circumferential surface of the guide pipe and the valve body. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 29/12 (2006.01); F04B 37/16 (2006.01); F04C 23/00 (2006.01); F04C 25/02 (2006.01); F04C 29/06 (2006.01); F16K 1/38 (2006.01); F16K 15/06 (2006.01); F16K 15/10 (2006.01); F04C 18/12 (2006.01)
CPC (source: EP)
F04C 29/065 (2013.01); F04C 29/12 (2013.01); F04C 18/126 (2013.01)
Citation (applicant)
- JP H02157490 A 19900618 - CIT ALCATEL
- JP H0814172 A 19960116 - ANLET KK
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1199476 A2 20020424; EP 1199476 A3 20030305; JP 2002122088 A 20020426
DOCDB simple family (application)
EP 01124519 A 20011012; JP 2000314966 A 20001016