Title:
OIL-INJECTED VACUUM PUMP ELEMENT
Document Type and Number:
WIPO Patent Application WO/2016/112439
Kind Code:
A8
Abstract:
Oil-injected vacuum pump element, whereby two cooperating helical rotors (3) are rotatably provided in a housing (2), whereby this housing (2) comprises an inlet port (8) and an outlet end face (6) with an outlet port (9), whereby compression chambers (11a, lib) are formed between the helical rotors (3) and the housing (2), characterised in that the vacuum pump element (1) is provided with a connection that extends from a first compression chamber (11a) to a second smaller compression chamber (lib) at the outlet end face (6), whereby this first compression chamber (11a) is at a lower pressure than the second compression chamber (lib) and whereby this second compression chamber (lib) can make connection with the outlet port (9) upon rotation of the helical rotors (3), whereby the connection is such that a flow from the second compression chamber (lib) to the first compression chamber (11a) is possible, whereby the connection is not directly connected to the outlet port (9).
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Inventors:
BOECKX JENS (BE)
SEGERS JOZEF MARIA (BE)
SEGERS JOZEF MARIA (BE)
Application Number:
PCT/BE2016/000002
Publication Date:
September 09, 2016
Filing Date:
January 07, 2016
Export Citation:
Assignee:
ATLAS COPCO AIRPOWER NV (BE)
International Classes:
F04C28/26; F04C18/14; F04C28/06
Attorney, Agent or Firm:
VAN VARENBERG, Patrick (Arenbergstraat 13, 2000 Antwerpen, BE)
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