Canister heater with ptc wafer

Details Canister heater with ptc wafer Canister heater with ptc wafer

F - Mech Eng,Light,Heat,Weapons

24

H

309/48

F24H 3/04 (2006.01) F02M 31/00 (2006.01) F02M 33/02 (2006.01)

Patent

CA 1271797

CANISTER HEATER WITH PTC WAFER Abstract An electric heater assemblage for attachment to the air intake opening of a fuel vapor recovery canister of the type containing material adapted to alternately ad- sorb and store, or release fuel vapor. The assemblage includes a wafer of electric resistance heating materi- al, and electrical connections for effecting energiza- tion of the wafer. The wafer has opposite expansive surfaces, and there is a first wall located at one side of the wafer and having an expansive surface coextensive with one wafer surface, and a second wall located at the opposite side of the wafer and having an expansive sur- face coextensive with the other wafer surface. The first wall and wafer thus define a first chamber, and the sec- ond wall and wafer define a second chamber in communica- tion with the first chamber at the periphery of the wa- fer. A housing that carries the wafers and walls directs air from the exterior of the canister into the first chamber, past one side of the wafer and its periphery and into the second chamber, past the opposite side of the wafer and thereafter to the interior of the canis- ter, for imparting heat to the adsorbent material con- tained therein. The advantage of the present construc- tion over the devices of the prior art is that improved efficiency is obtainable, while maintaining low overall cost.

549012

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