Abstract 1,055,530. Fluid-pressure servomotor systems; pure fluid amplifiers. BENDIX CORPORATION. Nov.24, 1965 [Nov.27, 1964], No. 49921/64. Headings G3H and G3P. A velocity sensor comprises a housing 10 having a chamber 12 with an inlet 14 and an outlet 16. Fluid from a constant pressure source 18 is fed to the inlet through a restrictor 22. A member 36 is rotatable in the chamber and has a constant fluid pressure supplied through conduit 40 and passages 44, 46, 48, 50 to the annular chamber between the member 36 and housing 10. Fluid leaving the member 36 acts on the fluid passing from the inlet 14 to the outlet 16 to cause a swirl in the fluid and the speed of rotation of the member 26 determines the swirl imposed on the fluid. The swirl determines the flow through the chamber and hence the pressure drop across the restriction 22 which is fed to a senor 54. In a modification, the member 36 is stationary and the housing 10 is rotated, the fluid imposing the swirl being fed to chamber 12 from the inner periphery of the housing 10.
VELOCITY SENSING APPARATUS FOR MEASURING THE VELOCITY OF A ROTATING MEMBER COMPRISING: A SWIRL CHAMBER HAVING A FLUID INLET AND A FLUID OUTLET; A SOURCE OF PRESSURIZED FLUID; A CONDUIT CONNECTED TO SUPPLY PRESSURIZED FLUID FROM SAID SOURCE TO SAID INLET; SAID FLUID OUTLET BEING CONNECTED TO A RELATIVELY LOW PRESSURE FLUID SOURCE; A RESTRICTION IN SAID CONDUIT; ROTATABLE MEANS INCLUDING PASSAGE MEANS CONNECTED TO RECEIVE A PRESSURIZED FLUID AND DISCHARGE THE SAME INTO SAID CHAMBER TO GENERATE A CONTROL FLUID SWIRL THEREIN WHICH VARIES IN ABSOLUTE VELOCITY AS A FUNCTION OF THE SPEED OF SAID ROTATABLE MEANS; SAID ROTATABLE MEANS BEING CONNECTED TO AND DRIVEN BY THE ROTATING MEMBER THE VELOCITY OF WHICH IS TO BE MEASURED; SAID CONTROL FLUID SWIRL BEING IMPOSED UPON THE FLOW OF FLUID PASSING THROUGH SAID CHAMBER FROM SAID INLET TO SAID OUTLET CAUSING THE SAME TO ACQUIRE A CORRESPONDING SWIRLING MOTION IN SAID CHAMBER WITH THE RATE OF FLOW THROUGH SAID RESTRICTTION AND THUS THE FLUID PRESSURE DIFFERENTIAL ACROSS SAID RESTRICTION VARYING ACCORDINGLY; AND MEANS RESPONSIVE TO THE FLUID PRESSURE DIFFERENTIAL ACROSS SAID RESTRICTION.
Claim 2
Dependent Claim
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VELOCITY SENSING APPARATUS FOR MEASURING THE VELOCITY OF A ROTATING MEMBER COMPRISING: A SWIRL CHAMBER HAVING A FLUID INLET AND A FLUID OUTLET; A SOURCE OF PRESSURIZED FLUID; A CONDUIT CONNECTED TO SUPPLY PRESSURIZED FLUID FROM SAID SOURCE TO SAID INLET; SAID FLUID OUTLET BEING CONNECTED TO A RELATIVELY LOW PRESSURE FLUID SOURCE; A RESTRICTION IN SAID CONDUIT; ROTATABLE MEANS INCLUDING PASSAGE MEANS CONNECTED TO RECEIVE A PRESSURIZED FLUID AND DISCHARGE THE SAME INTO SAID CHAMBER TO GENERATE A CONTROL FLUID SWIRL THEREIN WHICH VARIES IN ABSOLUTE VELOCITY AS A FUNCTION OF THE SPEED OF SAID ROTATABLE MEANS; SAID ROTATABLE MEANS BEING CONNECTED TO AND DRIVEN BY THE ROTATING MEMBER THE VELOCITY OF WHICH IS TO BE MEASURED; SAID CONTROL FLUID SWIRL BEING IMPOSED UPON THE FLOW OF FLUID PASSING THROUGH SAID CHAMBER FROM SAID INLET TO SAID OUTLET CAUSING THE SAME TO ACQUIRE A CORRESPONDING SWIRLING MOTION IN SAID CHAMBER WITH THE RATE OF FLOW THROUGH SAID RESTRICTTION AND THUS THE FLUID PRESSURE DIFFERENTIAL ACROSS SAID RESTRICTION VARYING ACCORDINGLY; AND MEANS RESPONSIVE TO THE FLUID PRESSURE DIFFERENTIAL ACROSS SAID RESTRICTION.