Centrifugal pump
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Feb 24, 1995
filing date -
Jul 16, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The impeller (1) is seated with its impeller hub (3) fixed for rotation on a shaft (4). The drive-side edges of the impeller (1), turn with slight clearance (a), over a pump-housing rear wall (5). The latter forms a labyrinth slot 6) with the impeller (1). The labyrinth slot (6) connects the pump chamber (2') with a hub chamber (7). Within the hub chamber (7), a coaxial vane wheel is connected, fixed for rotation, with the impeller (1) in order to impart a stronger rotary movement to the liquid in the hub chamber (7) and centrifuge it. The hub chamber (7) is provided with a peripheral opening (12) for the emergence of the liquid. The air collecting in the region of the shaft (4) escapes through a slot (10) which is formed by the hub housing wall (20) and the shaft (4). The peripheral opening (12) is arranged in the hub-housing wall (20) and developed as a drive nozzle; it debouches into a space (11) adjoining the hub chamber (7) and connected with it by the slot (10) and is directed against the diffuser pipe (13) and forms a liquid jet pump (12, 13) through which the liquid coming from the hub chamber (7) flows.
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