| 摘要 |
PCT No. PCT/FR89/00099 Sec. 371 Date Sep. 11, 1990 Sec. 102(e) Date Sep. 11, 1990 PCT Filed Mar. 9, 1989 PCT Pub. No. WO89/08771 PCT Pub. Date Sep. 21, 1989.The silencer includes a tubular envelope supported by an end piece for fixture to a gas supply source in which the pressure is to be reduced. A perforated plate and a disk close off the ends of the envelope which is drilled with escape apertures in the region of the disk. According to the invention, the gas flows at sonic speed through the plate to enter the envelope which is completely filled with a packing consisting of a tightly wound roll of wire mesh. The packing absorbs the shock waves developed by the supersonic flow of the gas in the packing. The latter maintains a subsonic flow with a low noise level upstream of the silencer. Application to the treatment of a surface by blasting of a gas flow is also described.
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