| 摘要 |
This invention relates to an improvement in an apparatus attached to an air cleaner such as of an internal combustion engine as in connection with a farm tractor wherein the contaminants drawn into the air cleaner are evacuated to the atmosphere therefrom by said apparatus wherein the improvement consists in having the apparatus continuously operative, providing a positive evacuation of contaminants and comprising a relatively small sized motor driving an impeller which receives contaminants from the air cleaner and evacuates or expells the same and embodies the use of a plurality of vanes whereby the engine associated with the air cleaner is prevented from drawing a reverse flow of air through the exhaust passage of the apparatus and the vanes serve as closure means whereby there is no open passage through the apparatus to the cleaner and thus only a low powered impeller is required to expel the comtaminants received. The air cleaner may be otherwise used than in connection with an internal combustion engine.
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