JPS55146215A - Silencer tube device - Google Patents

Abstract

PURPOSE: To reduce various fluid noises produced by a pump or the like and also noises due to mechanical vibration that is produced during operation of the pump, by dividing an outer sleeve into a plurality of chambers and forming a number of pleats or ruggedness on the inner wall surfaces of said chambers by use of a sound-absorbing material.

CONSTITUTION: Fluid discharged from a hydraulic machine such as pump is at first introduced from inlet port 5 into chamber A located on the left side of partition wall 6. When the fluid is diffused in chamber A, it comes into contact with and reflected off the rugged wall surfaces of chamber A formed by sound-absorbing material 2, so that pulsation of pressure is attenuated through interference or interaction of fluid. Then, fluid flows into connecting pipe 7 fixed in partition wall 6. Here, a hole 8 formed in the connecting pipe 7 at its inlet portion serves to absorb pressure wave in chamber A by the effect of resonance, so that pulsation of pressure is further attenuated. After passing through the connecting pipe 7, fluid enters chamber B and diffused therein, so that pulsation of pressure is attenuated again through interaction. Here, the phase of pressure wave is inverted 180 degrees by the function of another hole 8', and pulsation of pressure is attenuated through interaction of fluid coming into contact with and reflected off the rugged wall surfaces of chamber B formed by sound-absorbing material 2.

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