Screw pump
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United States of America Patent
Stats
-
Sep 27, 1988
Grant Date -
N/A
app pub date -
Jun 23, 1986
filing date -
Jun 24, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A screw pump including a screw assembly in a sleeve, the assembly comprising a drive screw having protruding threaded sides, and multiple driven screws having concave threaded sides which are closely meshed with the drive screw, thus forming a series of sealed chamber. The screw pump further includes one or more channels which are formed in the circumferential direction around the periphery of the driven screws, so that the final sealed chamber adjacent a discharge port of the pump partially communicates with the port through the channels shortly before the chamber completely opens to the port.
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