Patent ID: 10352339

Abstract:
An object is to provide a decompression device including a plurality of stages of orifice plates disposed in a flow passage, which generates less noise in response to sonic feedback phenomenon and gas-column resonance. A decompression device 10A includes: an upstream orifice plate 14 disposed in a duct 12 forming a flow passage for a fluid F; and a downstream orifice plate 16 disposed in the flow passage and downstream of the upstream orifice plate 14. A jet-flow interference part 22A is disposed only partially on an outlet rim portion of an orifice 18 on the upstream orifice plate 14 and configured to interfere with a jet flow discharged from the orifice 18. Positions of Karman vortices e are differentiated in a duct axial direction between regions with and without the jet-flow interference part 22A to reduce generation of noise.