| 摘要 |
<p>An air prefilter is disclosed for use with internal combustion engine air filters of the type having replaceable filter elements. The prefilter has a perforated sleeve connected between the usual intake openings and the filter element of the conventional air filter. This perforated sleeve is enveloped by an open-pore foam filter medium, which is of such porosity that engine intake air primarily passes therethrough rather than through the intake openings of the conventional air filter. The prefilter prevents foreign matter and water vapour from reaching and blocking the conventional filter element, which blocking causes the engine to receive insufficient air for efficient combustion. When the prefilter medium is saturated or blocked with impurities, the conventional air filter operates as usual, until the prefilter medium is cleaned or replaced. An adjustable deflector helps prevent foreign matter from blocking the prefilter medium. Annular plates retain the deflector in position and help prevent foreign matter from entering the conventional filter intake openings.</p> |
