TEST STAND FOR MINE FANS Russian patent published in 1994 - IPC

FIELD: mechanical engineering; test facilities. SUBSTANCE: test stand has wind tunnel, two pressure gauges and restrictor. Pressure gauges communicate with tunnel space through pressure pickups. Stand has compressed air source with pipeline and controlled valve. Restrictor is made in form of cylindrical chamber arranged coaxially inside tunnel. Diameter of cylindrical chamber is equal to diameter of fan impeller bushing. Chamber has flexible envelope forming a space together with chamber outer surface. Ends of envelope are secured on outer surface of chamber. End of envelope pointed to fan is arranged from fan at a distance equal to diameter of tunnel. Compressed air source is arranged inside chamber and is connected to space through pipeline. One of pressure pickups is arranged at place of maximum widening of envelope. Other pickup is installed opposite to end of envelope pointed to fan. EFFECT: enhanced quality of testing. 1 dwg