EP 4174316 A1 20230503 - VACUUM PUMP PROVIDED WITH A GAS BALLAST ARRANGEMENT
Title (en)
VACUUM PUMP PROVIDED WITH A GAS BALLAST ARRANGEMENT
Title (de)
VAKUUMPUMPE MIT EINER GASBALLASTANORDNUNG
Title (fr)
POMPE À VIDE DOTÉ D'UN AGENCEMENT DE BALLAST DE GAZ
Publication
Application
Priority
EP 21205596 A 20211029
Abstract (en)
The present invention relates to a vacuum pump (1) provided with a gas ballast arrangement. Such gas ballast arrangement includes a gas ballast supply duct (29) opening into the pumping chamber (7) of the vacuum pump, which gas ballast supply duct is open during the compression phase of the vacuum pump working cycle and is closed at least during the exhaust phase of the vacuum pumping working cycle. Thanks to this gas ballast arrangement, condensation of liquids in the pumping chamber can be effectively prevented while avoiding, at the same time, increase in power consumption and in noise generated by the vacuum pump. In a preferred embodiment, the gas ballast supply duct (29) is connected to the exhaust duct (23) of the vacuum pump by a connecting pipe (35) and the gas ballast arrangement includes a valve assembly (37, 39) arranged in said connecting pipe, so that opening / closing of the gas ballast supply pipe can be controlled by the pressure in said exhaust duct (23).
IPC 8 full level
F04C 18/32 (2006.01); F04C 25/02 (2006.01); F04C 29/00 (2006.01)
CPC (source: EP)
F04C 18/322 (2013.01); F04C 25/02 (2013.01); F04C 29/0007 (2013.01); F04C 29/0014 (2013.01); F04C 2220/50 (2013.01)
Citation (applicant)
- EP 0159163 A2 19851023 - UNIV TORONTO [CA]
- US 2014363319 A1 20141211 - CARBONERI ELISABETTA [US], et al
Citation (search report)
- [XAI] GB 847776 A 19600914 - HERAEUS GMBH W C
- [A] US 4268230 A 19810519 - BASSAN BENJAMIN
- [A] US 2779533 A 19570129 - KLAUS ZIOCK
- [A] EP 3483448 A1 20190515 - PFEIFFER VACUUM GMBH [DE]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 21205596 A 20211029