Pump device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 22, 2002
Grant Date -
Aug 22, 2002
app pub date -
Feb 21, 2001
filing date -
Feb 21, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump device for pumping a fluid having a housing which includes an inner wall to form a cavity. The device further includes an impeller rotatably mounted in the housing and residing in the cavity, wherein the impeller includes a cylindrical portion and first and second helixes that extend above the cylindrical portion. The first helix is adjacent the second helix such that the first and second helixes are interleaved with each other along a length of the impeller. The device also includes at least one inlet port formed in the housing for receiving fluid into the cavity, wherein upon rotation of the impeller, the fluid is caused to move in an axial direction and in a radial direction such that a centrifugal force is generated causing the fluid to move to the inner wall. A reaction force is then generated that causes the fluid to move back toward the impeller to increase friction between the impeller and the fluid to thereby increase the amount of fluid that is moved by the impeller. In addition, the device includes an outlet port for discharging fluid from the cavity.
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