EP 0630446 B1 19951213 - OIL-SEALED VACUUM PUMP
Title (en)
OIL-SEALED VACUUM PUMP
Title (de)
ÖLGEDICHTETE VAKUUMPUMPE
Title (fr)
POMPE A VIDE ETANCHE A L'HUILE
Publication
Application
Priority
- DE 4208194 A 19920314
- EP 9300312 W 19930209
Abstract (en)
[origin: DE4208194A1] The invention concerns a method of operating an oil-sealed vacuum pump (1) with an outlet nozzle (8) provided with a flap valve (9), an oil feed duct (11) which has a valve (13) and has its outlet in the suction chamber of the pump, an electric drive motor (14) for the rotor (4) with coils (15 and 20), and a capacitor (16). The valve (13) in the oil feed duct (11) is closed when the pump (1) is switched off or in the event of a power cut. To ensure that a vacuum is maintained even when a mechanical fault occurs, it is proposed that the valve (13) in the oil feed duct (11) should be controlled by the rotational speed of the rotor (4) and drive motor (14) so as to remain open at normal operating speed and to close when speed is reduced; the auxiliary coil (20) of the motor can serve as a sensor.
IPC 1-7
IPC 8 full level
F04C 25/02 (2006.01); F04C 28/28 (2006.01); F04C 29/02 (2006.01)
CPC (source: EP KR)
F04B 37/14 (2013.01 - KR); F04C 25/02 (2013.01 - KR); F04C 28/28 (2013.01 - EP); F04C 29/021 (2013.01 - EP)
Designated contracting state (EPC)
CH DE ES FR GB IT LI
DOCDB simple family (publication)
DE 4208194 A1 19930916; DE 59301174 D1 19960125; EP 0630446 A1 19941228; EP 0630446 B1 19951213; ES 2081705 T3 19960316; JP H07504730 A 19950525; KR 950701041 A 19950220; WO 9319298 A1 19930930
DOCDB simple family (application)
DE 4208194 A 19920314; DE 59301174 T 19930209; EP 9300312 W 19930209; EP 93903938 A 19930209; ES 93903938 T 19930209; JP 51619693 A 19930209; KR 19940703213 A 19940914