Patent ID: 6273772
Filing Date: 2001-08-14
Classification: B63H,F01N,Y02T

Abstract:
A waterlift silencer for reducing the acoustic energy of a fluid mixture of a liquid coolant and of exhaust gas from an engine comprising:a holding chamber that holds the fluid mixture:a first mixture-expelling conduit for dynamically lifting the fluid mixture above the silencer, the first mixture-expelling conduit having a bottom portion disposed within the holding chamber;a second mixture-expelling conduit for dynamically lifting the fluid mixture above the silencer, the second mixture-expelling conduit having a bottom portion disposed within the holding chamber;means for sequentially operating the first and second mixture-expelling conduits; andthe means for sequentially operating is constructed and arranged so that the first mixture-expelling conduit is dynamically operative when the engine is operated within a first range of operating speeds, and the second mixture-expelling conduit is dynamically operative when the engine is operated within a second range of operating speeds having a threshold speed below which the second mixture-expelling conduit is not dynamically operative.