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US 4,375,938 AGranted
Roto-dynamic pump with a diffusion back flow recirculator
AssigneeIngersoll-Rand Company
InventorJules L. Dussourd
Life of this patent
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Abstract
A roto-dynamic pump having recirculating means for preventing pump cavitation surging at low flow rates and at moderate to low values of net positive suction head.
Claims16
A roto-dynamic pump comprising:
- (a) a housing having a pump chamber, a leading edge region upstream of the pump chamber, an inlet region upstream of the leading edge region permitting fluid to enter the pump and an outlet region downstream to the pump chamber permitting fluid to discharge from the pump;
- (b) a roto-dynamic means in the pump chamber for pumping fluid wherein the roto-dynamic means has a leading edge and wherein swirling fluid backflows upstream;
- (c) a catching means at the leading edge region for collecting sufficient swirling backflowing fluid to prevent cavitation surging of the pump;
- (d) a diffusing means for converting the kinetic energy of the collected swirling fluid into pressure;
- (e) a straightening means for removing the swirl from the diffused fluid;
- and
- (f) a delivery means for returning the straightened fluid to the inlet region.
4 more elements
Dependencies are inferred from the claim text.