Back to results
US 4,900,222 AGranted
Rotary pump inlet velocity profile control device
AssigneeRockwell International Corporation
InventorsSen Y. Meng, Raymond B. Furst
Life of this patent
Estimating the term…
Abstract
A rotary pump with an inlet flow duct having a convergent section upstream the tips of the rotor blades. The convergent section decreases the cross-sectional flow area of the inlet flow duct prior to the flow being introduced into the rotor, thereby creating a substantially uniform velocity profile in the flow just upstream the rotor blades.
Claims2
A rotary pump, comprising:
- a housing;
- a rotor rotatably attached to said housing having an upstream end with a hub surface of revolution thereon;
- a plurality of rotor blades extending radially from said hub surface, each rotor blade having a leading edge, each leading edge intersecting said hub surface at substantially the same axial position, said intersections defining a first circle with a radius being the leading edge hub radius, R.sub.HUB, each rotor blade terminating in a tip, said tips defining a second circle having a radius, R.sub.TIP ;
- and
- a flow duct attached to said housing for introducing flow into said rotor, said flow duct having a first section upstream said rotor with a substantially constant radius, R.sub.o, a convergent second section downstream said first section but upstream said tips, and a third section downstream said second section having a radius R.sub.T being approximately equal to R.sub.TIP, said flow duct having a geometry defined by the relationship, ##EQU7## n=2 where Re.ltoreq.2300, n=2+0.00432 (Re-2300) where 2300<Re<3200, and
- n=3Re.sup.1/12 where Re>3200;
- .sigma.=R.sub.HUB /R.sub.T ;
- and,
- 0. 8.ltoreq.K.ltoreq.1.
6 more elements
A rotary pump, comprising:
- a housing;
- a rotor rotatably attached to said housing having an upstream end with a hub surface of revolution thereon;
- a plurality of rotor blades extending radially from said hub surface, each rotor blade having a leading edge and each terminating in a tip, each leading edge intersects said hub surface at substantially the same axial position, said intersection defining a first circle with a radius being the leading edge hub radius, R.sub.HUB, said tips defining a second circle having a radius, R.sub.TIP ;
- and
- inlet flow duct means attached to said housing for introducing flow into said rotor, said inlet flow duct means having a convergence section upstream said tips with a substantially constant radius, R.sub.O, a convergence section downstream said first section but upstream said tips, and a third section downstream said second section having a radius, R.sub.t being approximately equal to R.sub.TIP, said flow duct having a geometry defined by the relationship, ##EQU8## n=2 where Re.ltoreq.2300, n=2+0.00432 (Re-2300) where 2300<Re<3200, and
- n+3Re.sup.1/12 where Re>3200;
- .sigma.=R.sub.HUB /R.sub.T ;
- and,
- 0. 8.ltoreq.K.ltoreq.1.
6 more elements
Dependencies are inferred from the claim text.