Roto-dynamic pump with a backflow recirculator
First Claim
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1. 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 of the pump chamber permitting fluid to discharge from the pump;
(b) a roto-dynamic means in the pump chamber for pumping fluid entering the structure wherein the roto-dynamic means has a leading edge;
(c) a first annular slot substantially parallel to the flow of fluid in the leading edge region for collecting sufficient swirling backflow fluid caused by the roto-dynamic means to prevent cavitation surging of the pump;
(d) an annulus for removing the swirl from the collected fluid wherein the annulus comprises straightening vanes and wherein the length of the annulus is at least about three-fourths the diameter of the leading edge region; and
(e) a second annular slot for returning the straightened fluid into the inlet region at a direction substantially perpendicular to that of the incoming fluid in the inlet region.
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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.
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Citations
7 Claims
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1. A roto-dynamic pump comprising:
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(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 of the pump chamber permitting fluid to discharge from the pump; (b) a roto-dynamic means in the pump chamber for pumping fluid entering the structure wherein the roto-dynamic means has a leading edge; (c) a first annular slot substantially parallel to the flow of fluid in the leading edge region for collecting sufficient swirling backflow fluid caused by the roto-dynamic means to prevent cavitation surging of the pump; (d) an annulus for removing the swirl from the collected fluid wherein the annulus comprises straightening vanes and wherein the length of the annulus is at least about three-fourths the diameter of the leading edge region; and (e) a second annular slot for returning the straightened fluid into the inlet region at a direction substantially perpendicular to that of the incoming fluid in the inlet region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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Current AssigneeFlowserve Management Company (Flowserve Corporation)
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Original AssigneeIngersoll-Rand Company (Trane Technologies plc)
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InventorsCooper, Paul
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Primary Examiner(s)Coe, Philip R.
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Application NumberUS06/229,295Time in Patent Office769 DaysField of Search415/11, 415/53 R, 415/74, 415/59, 415/143, 415/DIG. 1US Class Current415/58.5CPC Class CodesF04D 15/00 Control, e.g. regulation, o...F04D 29/2277 for increasing NPSH or deal...F04D 29/688 especially adapted for liqu...Y10S 415/914 Device to control boundary ...
