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Patent Searching and Data


Title:
LIQUID RING PUMP AND METHOD FOR OPERATING A LIQUID RING PUMP
Document Type and Number:
WIPO Patent Application WO/2011/128502
Kind Code:
A3
Abstract:
The invention relates to a liquid ring pump (1) for generating vacuum and for pumping a flow of sewage in a vacuum sewage system. The liquid ring pump comprises in the direction of the flow of sewage a pump inlet (11), an inlet chamber (13), a pump housing (14) provided with a rotor (15) arranged on a drive shaft(16) provided with a mechanical seal (20), an outlet chamber(17), and an pump outlet (19). The mechanical seal (20) is arranged within the outlet chamber (17). The outlet chamber (17) is provided with an integrated extension (18) providing an enlargement of the outlet chamber (17)in order to retain the flow of sewage in the outlet chamber (17) before it is discharged from the pump outlet (19) in order to improve the lubrication of the mechanical seal (20).

Inventors:
LAPPALAINEN, Vesa (Herttuantie 1 B 27, Vantaa, FI-01520, FI)
Application Number:
FI2011/050276
Publication Date:
May 31, 2012
Filing Date:
March 31, 2011
Export Citation:
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Assignee:
EVAC INTERNATIONAL OY (Sinimäentie 14, Espoo, FI-02630, FI)
LAPPALAINEN, Vesa (Herttuantie 1 B 27, Vantaa, FI-01520, FI)
International Classes:
F04D3/02; F04C19/00; F04C27/00; F04D31/00
Domestic Patent References:
WO1990010123A11990-09-07
Foreign References:
EP0494041A11992-07-08
DK9200177U31993-02-26
EP2090783A22009-08-19
EP0766988A11997-04-09
DE3421866A11985-12-19
US3771898A1973-11-13
Attorney, Agent or Firm:
AWEK INDUSTRIAL PATENTS LTD OY (PL 230, Helsinki, FI-00101, FI)
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