Accession Number : ADD016529

Title :   Cascade Orificial Resistive Device.

Descriptive Note : Patent, Filed 16 Jun 92, patented 12 Jul 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bitsakis, Nicholas ; Cassidy, James

Report Date : 12 Jul 1994

Pagination or Media Count : 6

Abstract : A cascade orificial resistive device for throttling fluid flow which minimizes acoustic noise and internal vibrations is described herein. The device has a hollow body defining a fluid passageway, a plurality of perforated plates mounted within the passageway, a fixed end ring adjacent one end of the perforated plates, and a threadable end ring adjacent an opposite end of the perforated plates to place the plates in compression. Each of the perforated plates is a single piece molded plate having an integral outer ring and an integrally formed center keying mechanism as well as a plurality of orifices. The keying mechanism formed on each plate is designed so that adjacent ones of the plates have their orifices misaligned. In this manner, a pressure drop across each plate is created and the fluid flow through the device is throttled. The device of the present invention has utility in a number of onboard marine vessel systems wherein reduced acoustic noise and internal vibrations are particularly desirable.

Descriptors :   *FLUID FLOW, *THROTTLING, *ACOUSTIC ATTENUATION, *PATENTS, ACOUSTICS, COMPRESSION, INVENTIONS, NOISE, NUMBERS, ONBOARD, ORIFICES, PLATES, PRESSURE, RINGS, VIBRATION, ORIFICES, SHIPS, DAMPING, CASCADE STRUCTURES

Subject Categories : Acoustics
      Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE