Check valve for an engine vacuum pump

摘要

A rotary vane pump includes a housing that encloses an air chamber. An intake aperture extends to the air chamber. A check valve couples with the intake aperture and includes a stop having first and second sides. A helical spring engages the first side and biases the second side against a valve seat. A porous body is disposed between the helical spring and the air chamber for preventing fluid backflow.

主权项

1. A check value of a rotary vane pump, comprising
a stop having first and second sides; a helical spring engaging the first side and biasing the second side of the stop against a valve seat to a closed position; a porous body disposed between the helical spring and an air chamber of the rotary vane pump, wherein the porous body includes a structural frame for rigidly supporting the spring away from the intake aperture, and wherein the structural frame surrounds a piece of metal foam and includes openings to allow air flow to enter the air chamber; and a conduit extending orthogonally from an intake aperture of the rotary vane pump, the conduit defining an L-shape, wherein the porous body and the helical spring extended within the conduit and support the stop away from the intake aperture.