Siren

Details Siren Siren

G - Physics

10

K

84/46

G10K 7/00 (2006.01) G10K 7/06 (2006.01)

Patent

CA 1221257

Improved Siren Abstract A siren comprises a compressed air supply which is deflected by stationary deflectors to exit radially through stator ports. A rotor with spaced ports rotates between the stator and deflector thereby opening and closing the stator ports. Stationary vanes are disposed at circumferentially spaced locations, and constitute together with the deflector plate and stator and rotor housing, plenums. There are fewer rotor ports than stator ports, which generates an out-of-phase acoustical pattern which creates an acoustic combination from the stator ports of an acoustic output at a distance from the siren which is more uniform spatially. The thermoplastic seal between the stator and the rotor has minimal clear- ance under operating conditions having been run-in and plastically deformed at a temperature higher than for normal operation.

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