Means for reducing cavitation-induced erosion of centrifugal pum

Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with...

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415219A, 415219C, 415206, F01D 2524

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active

042394538

ABSTRACT:
Erosion of parts owing to cavitation in the part-load region of operation of a centrifugal pump is reduced or eliminated by equipping the pump with an annular diffuser which is installed upstream of the annular intake of the impeller. The impeller portion immediately downstream of the inlet edge, where the vanes begin, is bounded by a surface which diverges at an angle of 8 to 20 degrees, as considered in the direction of fluid flow in the impeller. The diffuser has a smaller first cross section which is remote from and a larger second cross section which is nearer to the impeller. The area of the smaller cross section is between one-half and nine-tenths of the area of the larger cross section. If the diffuser has a conical internal surface, the angle of divergence of such conical surface (as considered in the direction of fluid flow toward the impeller) is between 5 and 15 degrees. If the diffuser is internally stepped, the ratio of its length to the diameter of the larger cross section is between 0.2 to one and one to one.

REFERENCES:
patent: 2010525 (1935-08-01), McHugh
patent: 2291138 (1942-07-01), Blom
patent: 2671406 (1954-03-01), Waller
patent: 2677327 (1954-05-01), MacNeille et al.
patent: 3307776 (1967-03-01), White
patent: 3976390 (1976-08-01), Silvern et al.
patent: 4029430 (1977-06-01), Fonda-Bonardi

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