| 摘要 |
PURPOSE:To silence a low frequency component, a medium frequency component and a high frequency component constituting a noise stepwisely and simultaneously to positively discharge a drain water in an exhaust gas, by employing a compact and an inexpensive construction wherein a low frequency noise silencer having an inlet tube for the exhaust gas is provided at an outside thereof with a medium frequency noise silencer or a high frequency noise silencer for forming a dual cylindrical structure, while these two silencers being communicated with each other via a throttle tube. CONSTITUTION:A medium frequency noise silencer 3 is communicated with a low frequency noise silencer 1 via a throttle tube 4 passing through a side wall of the low frequency noise silencer 1, and has its upper end opening 4a defined at a level higher than an opening 2a of an inlet tube 2. Moreover, the low frequency noise silencer 1 has a high frequency noise silencer 5 provided at a lower part thereof and surrounded with the medium frequency noise silencer 3. A basement of the high frequency noise silencer 5 is opened to an outside through an exhaust tube 7, while a side wall adjacent to a basement of the low frequency noise silencer 1 is provided with a drain port 8 constituted by small diameter orifices communicating with the medium frequency noise silencer 3. |
