EP 0660904 B1 19970305 - CENTRIFUGAL PUMP
Title (en)
CENTRIFUGAL PUMP
Title (de)
KREISELPUMPE
Title (fr)
POMPE CENTRIFUGE
Publication
Application
Priority
- CH 9400129 W 19940624
- CH 216093 A 19930716
Abstract (en)
[origin: WO9502768A1] Proposed is a pump with an impeller (1) which is securely mounted by its boss (3) on a shaft (4) so that it cannot rotate. The rear (driven) edges of the impeller rotate, leaving a narrow clearance (a), over the rear wall (5) of the pump housing. Together with the impeller (1), this wall forms a labyrinth gap (6) which connects the pump chamber (2') with a hollow space (7) in the boss. Connected in this hollow space (7) to the impeller (1) so that it cannot rotate is a coaxial flywheel designed to impart a vigorous rotational motion to the liquid in the hollow space (7) and hence force it out of the space. The space (7) has a peripheral opening (12) to allow the liquid to pass out. The air which collects near the shaft (4) escapes through a gap (10) between the boss-housing wall (20) and the shaft (4). The peripheral opening (12) is located in the boss-housing wall (20) and designed as a propulsion nozzle. It opens out into a space (11) adjacent to the hollow space (7) in the boss and connected to it by the gap (10), the nozzle pointing towards a diffusion tube (13) and forming a jet pump (12, 13) through which the liquid emerging from the hollow space (7) in the boss flows.
IPC 1-7
IPC 8 full level
F04D 7/04 (2006.01); F04D 9/00 (2006.01); F04D 9/04 (2006.01); F04D 9/06 (2006.01)
CPC (source: EP US)
F04D 7/045 (2013.01 - EP US); F04D 9/003 (2013.01 - EP US); F04D 9/06 (2013.01 - EP US)
Designated contracting state (EPC)
DE DK FR GB IT NL SE
DOCDB simple family (publication)
WO 9502768 A1 19950126; CH 689004 A5 19980715; CN 1063529 C 20010321; CN 1112371 A 19951122; DE 59401938 D1 19970410; EP 0660904 A1 19950705; EP 0660904 B1 19970305; JP H08501615 A 19960220; RU 2118712 C1 19980910; RU 95108259 A 19970310; US 5545005 A 19960813
DOCDB simple family (application)
CH 9400129 W 19940624; CH 216093 A 19930716; CN 94190508 A 19940624; DE 59401938 T 19940624; EP 94918260 A 19940624; JP 50426595 A 19940624; RU 95108259 A 19940624; US 39277495 A 19950224