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Pub. No.:    WO/1980/002304    International Application No.:    PCT/US1980/000465
Publication Date: 30.10.1980 International Filing Date: 17.04.1980
F01N 1/00 (2006.01), F01N 1/02 (2006.01), F02M 35/12 (2006.01), F16L 55/027 (2006.01), F16L 9/21 (2006.01), F24F 13/24 (2006.01)
Priority Data:
30925 17.04.1979 US
Abstract: front page image
(EN)The present invention relates to the acoustical gas flow silencer field, e.g. heating, ventilating and air conditioning systems, engine intakes and exhausts, process blowers and compressors, etc. In the prior art, silencers were constructed using an absorbtive material, which was both expensive and inefficient. The device described herein is a packless silencer, and accomplishes the desired end of dampening undesired noise in a manner both more economical and efficient than heretofore known. The invention described is a resistive sheet type of duct liner or duct silencer, i.e., a liner or silencer in which acoustical flow resistance is concentrated in a thin face sheet (14a) separating the flow passage and acoustical cavity (16) the invention disclosed is a means for applying inexpensive perforated facings (14) and (14a) similar to those in a conventional packed silencer, to provide resistive sheets which are effective in terms of noise dissipation and in terms of self-noise (noise generated by flow through the flow passages).
(FR)Domaine des silencieux d"ecoulement acoustique des gaz par exemple systemes de chauffage, ventilation et air conditionne, admissions et echappements de moteurs, soufflantes et compresseurs, etc. Dans l"art anterieur, les silencieux etaient construits en employant un materiau absorbant, qui etait a la fois couteux et inefficace. Le present dispositif est un silencieux sans bourrage, et accomplit le but recherche d"amortir les bruits indesirables d"une maniere a la fois plus economique et efficace que les dispositifs connus jusqu"a present. Le dispositif en question est une conduite de fourreau ou de silencieux du type a feuille resistante, c"est-a-dire un fourreau ou silencieux dans lequel la resistance de l"ecoulement acoustique est concentree dans une feuille fine de facade (14a) separant le passage d"ecoulement et la cavite acoustique (16); l"invention decrit des moyens d"application de placages perfores peu couteux (14 et 14a) semblables a ceux utilises dans un silencieux a rembourrage conventionnel, de maniere a obtenir des feuilles resistantes qui sont efficaces en matiere de dissipation du bruit et en matiere d"auto-bruit (bruit produit par l"ecoulement au travers des passages d"ecoulement).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)