Accession Number : ADD017362

Title :   Gear Pump With Reduced Fluid-Borne Noise.

Descriptive Note : Patent Filed 30 Sep 93, patented 1 Nov 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Henry, John W ; Flickinger, William F ; Dolinar, Joseph F , Jr ; Rodriguez, Francisco A ; Smith, James W

Report Date : 01 Nov 1994

Pagination or Media Count : 9

Abstract : A crescent internal gear pump achieves greatly improved sealing against counter flow of fluid and greatly reduced noise hy increase of the number of teeth of each of the ring and pinion gears which form discrete volumes of pumped fluid against a crescent-shaped member or insert. Reduction of the size of the teeth ring and pinion gears allows an increase in the angular extent of the crescent-shaped insert in order to increase the number of discrete volumes to be increased to a minimum of nineteen for each of the ring and pinion gears. The reduction in noise is accompanied by an increase in the fundamental frequency of the remaining noise, which can be more readily attenuated by acoustic filtering and isolation. Perfecting features of the invention include shaping of the crescent shaped member to equalize the number of discrete volumes formed by each of the ring and pinion gears and shaping the teeth of the pinion gear to equalize the volumes of the discrete volumes formed by each gear. (AN)

Descriptors :   *PUMPS, *GEARS, *PATENTS, PRESSURE GRADIENTS, VOLUME, COMPARISON, LEAKAGE(FLUID), EFFICIENCY, MASS FLOW, ACOUSTIC ATTENUATION, NOISE REDUCTION, ACOUSTIC FILTERS, FLOW NOISE, RINGS, ROTATION, AXIAL FLOW, PUMPING, GEAR TEETH, RADIAL FLOW, GEAR NOISE

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Machinery and Tools
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE