Pumps – Motor driven – Electric or magnetic motor
Patent
1985-07-05
1986-05-13
Croyle, Carlton R.
Pumps
Motor driven
Electric or magnetic motor
414 90, 277 3, 384478, 417366, F04B 1700, F01D 136, F16J 1540
Patent
active
045883610
ABSTRACT:
A high vacuum rotary pump comprising a rotor (3) mounted in a stator (1) having a suction end (5) and an exhaust end, the exhaust end being pierced by an exhaust orifice (6) intended for connection to the suction end of a primary pump, said rotor being drivable coupled to a motor (8, 10) housed in a sleeve (11), said sleeve extending the exhaust end of said stator and having the same internal pressure as the exhaust end of the stator, the rotating members of said motor and rotor being supported by bearings (12, 13), and the far end of the sleeve from its end adjacent to the stator being closed by an end plate (14), the pump including the improvement whereby an orifice (16) for rapidly returning the stator to atmospheric pressure is provided in said sleeve in such a manner as to avoid oil vapor being introduced into the stator from the primary pump when the pump is stopped, said orifice being provided with a valve which is closed during operation of the pump and which is open only when the pump is stopped.
REFERENCES:
patent: 2670898 (1954-03-01), Pickels
patent: 3327938 (1967-06-01), Stallmann
patent: 3347604 (1967-10-01), Lavelle et al.
patent: 3399827 (1968-09-01), Schwartzman
patent: 3832084 (1974-08-01), Maurice
patent: 4180370 (1979-12-01), Klalt et al.
patent: 4332522 (1982-06-01), Saulgeot
patent: 4512725 (1985-04-01), Saulgeot
Compagnie Industrielle des Telecommunications Cit-Alcatel
Croyle Carlton R.
Olds Theodore W.
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