Restrictors using venturi effect

Abstract

Restrictors are disclosed that include a body defining a Venturi tube having a throat defining a junction of a converging inlet cone to a diverging outlet cone along a longitudinal axis thereof, and with the converging inlet cone and the diverging outlet cone each defining an inner passageway that transitions as a hyperbolic or parabolic function toward the throat.

Description

[0001] related application [0002] This application claims the benefit of U.S. Provisional Application No. 62 / 211,408, filed August 28, 2015, which is incorporated herein by reference. technical field [0003] The present application relates to restriction devices using the Venturi effect for producing a substantially constant fluid flow therethrough during operating pressure changes, and more particularly to such restriction devices for use in positive crankcase ventilation systems. Background technique [0004] Operational needs require that air and / or gases be removed from the engine crankcase. This ensures that no pressure builds up due to blowby gases passing through the engine's rings and pistons, and that fuel and water do not accumulate in the crankcase. Worldwide, there are regulations requiring crankcase gases to pass through the combustion chamber in order to minimize the release of harmful emissions. One method used to do this is to connect the crankcase to th...

AI Technical Summary

Problems solved by technology

[0005] This flow creates a potential shift in engine calibration as this gas flow can vary due to the pressure drop between the crankcase and intake manifold

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