Fluid flowmeter

Details Fluid flowmeter Fluid flowmeter

G - Physics

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73/125

G01L 1/20 (2006.01) G01F 1/32 (2006.01) G01F 1/34 (2006.01)

Patent

CA 1119428

77-RES-101 APPLICATION OF: HERMANN KAISER, RICHARD A. NELLUMS, AND JERRY A. OLSON FOR: FLUID FLOWMETER A B S T R A C T A low pressure drop air flowmeter for an automotive engine is disclosed. The meter includes a main air flow passage, a relatively small venturi tube receiving a portion of the air flow, a pressure port for sensing stagnation pressure in the main passage, a pressure port for sensing static pressure in the throat of the venturi, and a set of stationary swirl vanes dis- posed adjacent the outlet of the venturi and operative to impart a swirl to the remainder of the air in the main passage, thereby creating a reduced pressure at the venturi outlet for amplifying the pressure difference between the stagnation and static pressures without appreciably increasing the pressure drop across the flowmeter. Also disclosed is a solenoid valve having a single valving member operative in one position to communicate the stagnation pressure to an absolute pressure transducer and operative in another position to communicate the static pressure to the transducer.

313770

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