Perforated disc type turbine flowmeter

Claim 1

A FLOWMETER COMPRISING: A FLUID CONDUIT; A MEASURING ROTOR IN THE FORM OF A DISC SUPPORTED WITHIN SAID CONDUIT FOR ROTATION ABOUT THE LONGITUDINAL AXIS OF SAID CONDUIT; SAID ROTOR HAVING AN UPSTREAM FACE AND A DOWNSTREAM FACE; PASSAGEWAY MEANS EXTENDING THROUGH SAID ROTOR AND THROUGH WHICH FLUID FLOWS FROM SAID UPSTREAM FACE TO SAID DOWNSTREAM FACE; SAID PASSAGEWAY MEANS BEING OF UNIFORM SIZE ALONG THE LENGTH THEREOF AND BEING ANGULARLY POSITIONED WITHIN SAID ROTOR IN SUCH A MANNER THAT FLUID FLOWING THERETHROUGH IMPARTS A ROTATIONAL TORQUE TO SAID ROTOR WHICH ROTATES SAID ROTOR AT A SPEED PROPORTIONAL TO THE RATE OF FLUID FLOW; AND MEANS FOR MEASURING THE ROTATIONAL SPEED OF SAID ROTOR TO OBTAIN A MEASURE OF FLUID FLOW RATE THROUGH SAID CONDUIT; SAID PASSAGEWAY MEANS COMPRISING A PLURALITY OF SEPARATE PASSAGEWAYS EXTENDING THROUGH SAID ROTOR AT DIFFERENT DISTANCES FROM THE AXIS FO SAID ROTOR; THE GREATER THE ANGLE OF ATTACH OF THE PASSAGE WITH THE GREATER THE ANGLE OF ATTACK OF THE PASSAGE WITH THE AXIAL DIRECTION OF FLUID FLOW THEREBY PROVIDING MINIMUM DISTURBANCE OF THE FLUID.