Apparatus for selectively sampling dust and like solid particles granulometrically

Claim 1

Apparatus for the selective sampling, in accordance with a granulometric cut, of dust and like solid particles suspended in a gaseous medium, said apparatus comprising: a circular sampling chamber, at least one evacuation orifice communicating with said chamber through the periphery thereof, and an annular suction duct communicating with the chamber centrally thereof; and a rotor mounted in said sampling chamber for rotation at high speeds, said rotor comprising a support plate impermeable to the gaseous medium, and a thick rotary element of a material permeable to the gaseous medium rotationally fixed to the support plate, the rotary element being coaxial with said annular suction duct and defining a central supply duct having a central suction aperture, the internal diameter of said annular suction duct being substantially greater than the diameter of said central suction aperture, said rotor further comprising a circular collection casing coaxial with and at least partly covering the rotary element with the exception of said central suction aperture, the collection casing having, on its side nearer to said annular duct, a circular aperture whose diameter is at least equal to the external diameter of the annular duct.