Hydrometric vane
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Feb 25, 1992
filing date -
Feb 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydrometric vane has a housing, an upstream casing and a downstream casing provided in the housing, an impeller rotatably supported in the housing and axially movable between the casings. The impeller has a hub which forms an annular chamber and extends into the downstream casing to form a gap therebetween so that when a fluid flows through the gap an underpressure loading the hub is caused and compensates a hydrodynamic pressure acting on the impeller. The hub has a central part and a cylindrical casing between which the annular chamber is formed. The downstream casing has at least one opening communicating with the annular chamber so that the liquid which leaves the annular chamber can flow through the at least one opening. A closure member is arranged on the central part and movable to a closing position in which it interrupts a communication between the annular chamber and the downstream casing. A ring is located in the region of the gap and extending into the annular chamber, and a counter ring is provided at an outlet end of the ring gap.
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