Composite air/hydrocarbon trap filter assembly
AssigneeAdvanced Flow Engineering, Inc.
InventorsShahriar N. Niakan, Stuart T. Miyagishima, Jeffrey S. Krangnes
Life of this patent
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Abstract
A tamper resistant hydrocarbon trap and air filter assembly includes a cylindrical carbon trap filter extending from a sealed upstream end to a downstream end seated and sealed in a forwardly facing recess of an adaptor. A conventional cylindrical air filter surrounds the carbon trap filter with a sealed upstream end and a downstream end removable secured to an annular flange on the adaptor with the downstream end of the adaptor being arranged to be coupled to a vehicle's air intake.
Claims16
A tamper resistant hydrocarbon trap and air filter assembly for vehicle internal combustion engines comprising:
- a) a tubular filter adaptor having a generally circular downstream end joined to a generally circular upstream end and terminating in an annular flange extending above the upstream end for accommodating the downstream end of an air filter;
- b) a generally cylindrical hydrocarbon trap filter formed with a layer of activated carbon granules sandwiched between two layers of a porous material enclosing an open core and extending from a sealed upstream end to a downstream end secured to the upstream end of the adaptor so that air passing between the two ends of the trap's filter is channeled through the upstream end of the adaptor;
- and
- c) a generally cylindrical air filter surrounding the trap filter and extending from a sealed upstream end forward of the trap filter's upstream end to a downstream end secured to the adaptor annular flange.
A composite air/hydrocarbon trap filter assembly adapted to be connected in series with the air intake of an internal combustion engine in which the air filter is removable for cleaning or replacement comprising:
- a) a tubular adapter having a generally circular downstream end of a first diameter d1 for connection to the engine's air intake, then progressing to a cylindrical section then an outwardly flared transitional section to a generally circular upstream end having a second diameter d2 and terminating in an annular flange extending above and rearwardly of the upstream end for receiving the downstream end of a removable air filter, where d1<d2;
- b) a generally cylindrical hydrocarbon trap filter formed with at least one layer of GAC sandwiched between one or more layers of a porous material surrounding an open core and extending from a sealed upstream end to a downstream end secured to the upstream end of the adaptor so that influent air between the trap filter ends is channeled through the upstream end of the adaptor;
- and
- c) a generally cylindrical air filter formed with an annular shoulder at its downstream end having a curvature complementary with and releasably secured to the adaptor annular flange, the air filter surrounding the trap filter and terminating in a sealed upstream end forward of the trap filter's upstream end so that influent air will pass through the carbon trap filter on its way to the adaptor's upstream end.
A composite air/hydrocarbon trap filter for connection in series with an internal combustion engine's air intake comprising:
- a) a tubular adaptor having a generally circular downstream end joined to a generally circular upstream end through a flared transitional section with a forwardly facing annular recess surrounding the upstream end and an annular flange encircling the recess and extending rearwardly thereof toward the downstream end;
- b) a generally cylindrical hydrocarbon trap filter formed with at least one layer of GAC sandwiched between one or more layers of a porous filter media and extending from a sealed upstream end to a downstream end seated and sealed within the adaptor recess;
- and
- c) a generally cylindrical air filter containing conventional air filtration media surrounding the carbon trap filter with a sealed upstream end and a downstream end secured to the adaptor's annular flange so that influent air will pass through the carbon trap filter on its way to the upstream end of the adaptor.
Dependencies are inferred from the claim text.