Static two stage air classifier
First Claim
1. A device for separating and classifying particles of a homogeneous granular mixture comprising:
- a feed duct having a feed inlet, a particle discharge outlet, a side particle opening and a side gas inlet opening, both of which are positioned between the feed inlet and the particle discharge outlet, said gas inlet opening designed to allow gas to flow into said feed duct and to direct a portion of said homogeneous granular mixture through said side particle opening as said homogeneous granular mixture moves from said feed inlet toward said particle discharge outlet;
a separator box having a top section with a dust collector outlet, a bottom section with a classifier outlet and an intermediate section therebetween, said bottom section including a particle inlet fluidly connected to said particle opening of said feed duct;
a classifying louver plate positioned between said particle inlet of said separator box and said particle opening of said feed duct, said classifying louver plate including a plurality of fins defining classifying channels between adjacently positioned fins; and
, a fan designed to cause a flow of gas from said particle inlet, into said separator box and upwardly to said dust collector outlet.
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Accused Products
Abstract
A two-stage static air classifier has a feed duct through which particles of a granular mixture fall. A classifying louver plate having fins forming upwardly inclined classifying channels is fitted into a side opening in the feed duct. Particles of a set size are drawn by air suction through the classifying channels in the first stage. A separator box having an inlet connected to the outlet of the classifying channels collects the separated particles in a second stage as the entrained particles fall by gravity to the bottom of the separator box while the air streams drawing the particles through the classifying channels pass out the top end of the box. Adjustable baffle plates transversely extending through the box permit control of the quantity of fines collected with the particles at the separator box bottom. Size of the collected particles is determined by the speed of a fan at the top outlet of the separator box.
45 Citations
76 Claims
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1. A device for separating and classifying particles of a homogeneous granular mixture comprising:
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a feed duct having a feed inlet, a particle discharge outlet, a side particle opening and a side gas inlet opening, both of which are positioned between the feed inlet and the particle discharge outlet, said gas inlet opening designed to allow gas to flow into said feed duct and to direct a portion of said homogeneous granular mixture through said side particle opening as said homogeneous granular mixture moves from said feed inlet toward said particle discharge outlet;
a separator box having a top section with a dust collector outlet, a bottom section with a classifier outlet and an intermediate section therebetween, said bottom section including a particle inlet fluidly connected to said particle opening of said feed duct;
a classifying louver plate positioned between said particle inlet of said separator box and said particle opening of said feed duct, said classifying louver plate including a plurality of fins defining classifying channels between adjacently positioned fins; and
,a fan designed to cause a flow of gas from said particle inlet, into said separator box and upwardly to said dust collector outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A device for separating and classifying particles of a homogeneous granular mixture comprising:
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a feed duct having a feed inlet, a particle discharge outlet, a side particle opening and a side gas inlet opening both of which are positioned between the feed inlet and the particle discharge outlet, said gas inlet opening designed to allow gas to flow into said feed duct and to direct a portion of said homogeneous granular mixture through said side particle opening as said homogeneous granular mixture moves from said feed inlet toward said particle discharge outlet;
a separator box having a top section with a dust collector outlet, a bottom section with a classifier outlet and an intermediate section therebetween, said bottom section including a particle inlet fluidly connected to said particle opening of said feed duct, said intermediate section including a plurality of spaced baffle plates transversely extending across said intermediate section; and
,a fan designed to cause a flow of gas from said particle inlet, into said separator box and upwardly to said dust collector outlet. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method for classifying particles of a granular medium by size comprising the steps of:
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providing a feed duct having a feed inlet, a particle discharge outlet, a side particle opening and a side gas inlet opening both of which are positioned between the feed inlet and the particle discharge outlet;
providing a louver classifying plate that is fluidly connected to said side particle opening of said feed duct, said classifying louver including a plurality of fins defining classifying channels between adjacently positioned fins;
providing a separator box fluidly connected to said louver classifying plate, said separator box including a top section with a dust collector outlet, a bottom section with a classifier outlet and an intermediate section therebetween;
feeding the granular medium into a feed duct;
directing gas to a side gas inlet opening to cause a portion of said granular medium being fed though said feed duct to become entrained in said gas and be directed through said louver classifying plate and into said separator box thereby causing a separation of particles in said feed duct; and
,directing at least a portion of said granular medium that is fed into said separator box upwardly in said separator box to contact a plurality of spaced baffle plates positioned above said louver classifying plate to further separate said granular medium. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76)
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Specification