Sound generator

Details Sound generator Sound generator

1998-03-09

1999-06-08

Dang, Khanh

Acoustics

Sound-modifying means

181177, G10K 1100

Patent

active

059106484

ABSTRACT:
In a sound generator of the type having a motor powered piston (7-9) limiting a chamber (18) connected to a resonance tube (16) and which is adapted to generate sound waves for cleaning heat exchange surfaces, the piston (7-9) is according the invention provided with two axially spaced piston membranes (8, 9) and a device (19) for establishing a vacuum between the two membranes (8, 9) and thus ensuring only tensile stresses in membranes (8, 9) thereby increasing their life time.

REFERENCES:
patent: 4763358 (1988-08-01), Danley
patent: 4805732 (1989-02-01), Moritz

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