Patent ID: 7409946
Filing Date: 2008-08-12
Classification: B01D,F02M

Abstract:
1. A fuel vapor recovery canister comprising an elongated housing formed to include an inlet end, an exit end, and an interior region extending therebetween, and a hydrocarbon filter bed located in the interior region, wherein the elongated housing includes a tube that contains a first portion of the hydrocarbon filter bed and has a first cross-sectional area and a funnel including a high-speed flow pipe having an opened end exposed to the atmosphere and a second cross-sectional area that is relatively smaller than the first cross-sectional area and a horn-shaped transition pipe arranged to interconnect the high-speed flow pipe and tube, and wherein the horn-shaped transition pipe contains a second portion of the hydrocarbon filter bed and converges in a direction extending toward the high-speed flow pipe to cause a stream of fuel vapor flowing in the interior region of the elongated housing through the high-speed flow pipe, horn-shaped transition pipe, and tube toward the inlet end in response to a vacuum applied to the interior region of the elongated housing at the inlet end to flow at a first velocity in the tube and at a faster second velocity in the high-speed flow pipe included in the funnel to hasten release of hydrocarbon material adsorbed on a third portion of the hydrocarbon filter bed located in the high-speed flow pipe into the stream of fuel vapor flowing in the tube toward the inlet end.