EP 0406873 A3 19911127 - VACUUM PUMP WITH SECURITY AGAINST AERATION OF RECIPIENT AT STOPPAGE
Title (en)
VACUUM PUMP WITH SECURITY AGAINST AERATION OF RECIPIENT AT STOPPAGE
Publication
Application
Priority
DE 3922417 A 19890707
Abstract (en)
[origin: EP0406873A2] The invention relates to an oil-sealed pre-vacuum pump on which the receiver is protected against aeration in the event of the pump being shut down in that in this state its expansion chamber is sealed vacuum tight on the atmosphere side. In order to achieve shutting off of the oil supply by the simplest possible means when the vacuum pump stops and at the same time to be able to precisely meter and shut off the gas supply necessary for silencing, an auxiliary pump 2 on the pump shaft is proposed which draws in oil through separate intake ducts 4 and 5, mixes it and forces it into the expansion chamber of the vacuum pump via a spring-loaded valve 7. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 27/02 (2006.01)
CPC (source: EP)
F04C 27/02 (2013.01)
Citation (search report)
- [A] DE 1703592 A1 19711118 - LEYBOLD HERAEUS GMBH & CO KG
- [A] DE 1190134 B 19650401 - EDWARDS HIGH VACUUM LTD
- [A] DE 3730685 A1 19880714 - MEDIZIN LABORTECHNIK VEB K [DD]
- [A] DE 3518016 A1 19860403 - MEDIZIN LABORTECHNIK VEB K [DD]
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0406873 A2 19910109; EP 0406873 A3 19911127; DE 3922417 A1 19910117; DE 3922417 C2 19910829
DOCDB simple family (application)
EP 90112881 A 19900705; DE 3922417 A 19890707