IMPROVEMENTS IN OR RELATING TO APPARATUS FOR SIZE SELECTIVE SEPARATION OF PARTICULATE MATTER IN A GAS STREAM

摘要

1,273,266. Pneumatic separation; separating particles from gas. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. 17 March, 1970 [27 March, 1969], No. 16246/69. Headings BIT and B2H An apparatus for size selective separation of particulate matter contained in a gas, e.g. a lung model simulator, comprises an inlet passage 9 for a particle-laden gas stream, a branch duct 11 through which a fraction of the gas stream is diverted with smaller particles entrained therein, a duct 10 through which the remainder of the gas stream flows and entrains with it particles which include larger particles which due to inertial and centrifugal forces are not diverted in the branch duct 11, and a filter 5 for collecting particles entrained in the gas flowing in one or both of the ducts 10, 11. The apparatus comprises a casing 1 having an outlet duct 2 to which suction is applied to create a gas stream through the apparatus. A plug member 6 is sealingly inserted in the casing and is made up of an outer ring 6a, an inner ring 6b and a central cap 6c connected together in spaced relationship by spider members, the spaces providing the passage 9, the duct 10 and the re-entrant duct 11 communicating with a central chamber 12. The filter 5 of paper-type is placed on a porous disc 4 supported on a ledge 3 and may cover only the outlet of the chamber 12.