Vacuum system for particulate materials and an improved ejector device therefor

This invention relates to a vacuum system for recovering particulate materials and more particularly to such a system having an improved ejector device as a component thereof. An ejector mountable on a planar wall of a housing for gathering and conveying particulate material to within such housing generally consisting of a flat base plate segment mountable on such planar wall member, a first set of flat plates joined together and with the base plate segment defining a converging fluid passageway, a second set of flat plate segments joined together and with the first set of plate segments and the base plate segment defining a restricted fluid passageway communicating with the converging fluid passageway and a third set of flat plate segments joined together and with the second set of plate segments and the base plate segment defining a diverging fluid passageway communicating with the restricted fluid passageway, one of the plate segments having a first inlet opening through which a stream of pressurized fluid may be injected into the converging and restricted fluid passageways, one of the plate segments having a second inlet opening through which fluid may be suctioned by a negative pressure created by a stream of pressurized air injected into the converging and restricted fluid passageways and one of the plate segments having an outlet opening communicable with the diverging fluid passageway.