Gaseous fluid aspirator or pump especially for smoke detection systems
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United States of America Patent
Stats
-
Dec 13, 1994
Grant Date -
N/A
app pub date -
Dec 9, 1992
filing date -
Jun 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gaseous fluid aspirator/pump apparatus including a rotary impeller (10) with radially extending blades, the impeller being mounted in a housing having a gaseous fluid inlet and outlet wherein gaseous fluid moving from the inlet (15) to the outlet (14) is turned from axial flow into the impeller to radial flow from the impeller, said impeller and an associated portion of the housing (16) being shaped to prevent flow separation and turbulence in the gaseous fluid stream while under the influence of the impeller. The impeller inlet (15) includes an inlet configuration of curvate conical from matching the configuration of the housing (16) in the area of the inlet opening. This configuration acting to prevent flow separation while turning the fluid flow through a large angle of approximately 90.degree. and acceleration and deceleration of the fluid flow is substantially prevented.
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