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1. (WO2018088231) MUFFLER

Pub. No.:    WO/2018/088231    International Application No.:    PCT/JP2017/038801
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Fri Oct 27 01:59:59 CEST 2017
IPC: F04B 39/10
F01N 1/02
F04B 39/00
F16K 1/34
F16K 15/02
Inventors: KIKUCHI, Masahiro
菊池 政寛
The muffler 1 comprises: an expansion part 20 having a discharge port 22 and defining an expansion chamber 21 therein; an acoustic element having a finite-length guide tube 10 defining a guide chamber 11 therein; a connection part 30 provided with a communication hole 32 for providing communication between the expansion chamber 21 and the guide chamber 11; and a check valve 5 for preventing back-flow of compressed air flowing from the guide chamber 11 into the expansion chamber 21 through the communication hole 32. The check valve 5 comprises: a valve seat 33 disposed on the connection part 30; a valve body 25 for closing the communication hole 32 by coming into contact with the valve seat 33; and a spring 26 for biasing the valve body 25 toward the valve seat 33. The valve body 25 comprises: tapered part 25a disposed on the peripheral part of the valve body as the portion that will abut the valve seat 33, having a shape tapering toward the valve seat 33; a flat part 25b disposed on the inner side of the tapered part 25a; and a recessed part 25c disposed on the opposite side of the valve body from the side facing the valve seat 33.