Patent ID: 7225799
Filing Date: 2007-06-05
Classification: F02M

Abstract:
1. A device combining a two-way valve and a carbon canister in a hollow can, being installed between a fuel tank and a fuel gas inlet of an engine for returning evaporated fuel gas in the fuel tank to the engine, the hollow can comprising a first chamber for installing the two-way valve and a second chamber to form the carbon canister; the two-way valve including: a top hole and a bottom hole respectively formed in the top wall and the bottom wall of the first chamber, an interior of the bottom wall being installed with a gas tube to connect the bottom hole to an evaporation chamber in the fuel tank; a gas channel formed in the top wall to connect the top hole to the second chamber; a movable element installed within the first chamber to be located between the top and the bottom walls; at least one valve hole and one trench formed in the movable element; a top spring installed between the movable element and the top wall of the first chamber so as to push the movable element downward; a bottom spring installed between the movable element and the bottom wall of the first chamber so as to push the movable element upward; and a dish-shaped valve element installed between the valve hole and the bottom spring so as to close the valve hole; and the carbon canister including: a plurality of non-woven clothes and active carbons installed within the second chamber; and at least one gas return tube connected between the second chamber and the fuel gas inlet, thereby when the engine does not start but in expansion pressure is formed in the evaporation chamber or the engine is operated to form a negative pressure, the movable element is lifted upward by the evaporated fuel gas accumulated in the evaporation chamber to open a gas gate so that the evaporated fuel gas in the fuel tank flows through the gas tube, bottom hole, gas gate, trench and gas channel to the second chamber and then flows from the hollow chamber through the gas return tube and the fuel gas inlet to the engine.