EP 0368122 B1 19930224 - MULTISTAGE ROOTS VACUUM PUMP
Title (en)
MULTISTAGE ROOTS VACUUM PUMP
Publication
Application
Priority
FR 8814494 A 19881107
Abstract (en)
[origin: EP0368122A1] Multi-stage roots vacuum pump comprising a stator defining a plurality of successive compression chambers (5) separated axially from one another by lateral flanges (1), and a rotor assembly arranged inside the stator and consisting of two parallel shafts (8, 9) supported by bearings (11, 12) in end flanges (2, 3) of the stator, each shaft (8, 9) being equipped in each chamber (5) with a compression lobe (13, 14), each chamber (5) thus containing two paired compression lobes (13, 14), one (8) of the two shafts being driven in rotation by a motor (15) and the other shaft (9) being driven in the opposite direction by means of a gear (17-18) located in a housing (6) fixed to the corresponding end flange (2) of the stator, the two shafts (8, 9) each passing through the said flange (2) via a lip gasket (19, 20), characterised in that a sealing module (24) is interposed between the said end flange (2) located on the same side as the said housing (6) and the compression chamber adjacent to the said housing, the said module (24) forming a partition equipped, round each shaft (8, 9), with the fixed part (25, 26) of a labyrinth gasket, each shaft being provided with the moveable complementary part (27, 28) of the labyrinth gasket, the said moveable parts of the labyrinth gaskets being located in a common cavity (31) of the said module which is connected, by means of a valve (32, 33), to the delivery channel (23) of the said compression chamber adjacent to the said housing, the said valve allowing fluid to pass in the direction of the said cavity (31) towards the said delivery channel. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 18/18 (2006.01); F04C 25/00 (2006.01); F04C 25/02 (2006.01); F04C 27/00 (2006.01)
CPC (source: EP US)
F04C 27/009 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0368122 A1 19900516; EP 0368122 B1 19930224; AT E86011 T1 19930315; DE 68905026 D1 19930401; DE 68905026 T2 19930617; ES 2039804 T3 19931001; FR 2638788 A1 19900511; FR 2638788 B1 19940128; JP H02157490 A 19900618; JP H066950 B2 19940126; RU 1784072 C 19921223; US 4990069 A 19910205
DOCDB simple family (application)
EP 89120179 A 19891031; AT 89120179 T 19891031; DE 68905026 T 19891031; ES 89120179 T 19891031; FR 8814494 A 19881107; JP 28983689 A 19891107; SU 4742466 A 19891104; US 43242889 A 19891106