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Patent US3878091A successfully refreshed from Google Patents.
US3878091A
Expired / Lapsed
US
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Method for pneumatic classification and a pneumatic classifier
Assignee: Kennedy Van Saun Corp
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Filing: 1972-09-15
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Granted: 1975-04-15
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Expires: 1992-09-15
Abstract
Abstract The pneumatic classifier as disclosed includes a main body, means to produce air circulation in the body, means to feed material to be classified thereto, cylone means to collect the final fine product, hopper means to collect the final coarse product, the classifier including an ejector as primary dispersion means located within the classifier body on a selected reference level, horizontal centrifugal classifier means located above the said reference level, and a secondary dispersion means located below the said reference level, the classifier being arranged to carry out the method steps of: 1. PRIMARY DISPERSION OF THE FEED MATERIAL INTO AN AIR SUSPENSION IN THE PRIMARY DISPERSION MEANS BY APPLYING THE EJECTION PRINCIPLE, 2. SEPARATION OF THE FRACTION RETAINED IN THE CREATED SUSPENSION IN A HORIZONTAL CENTRIFUGAL FIELD ON A HIGHER ELEVATION INTO A FINAL FINE PRODUCT AND A COARSER MIDDLING PRODUCT WHICH IS RETURNED DOWNWARD BACK INTO THE AIR SUSPENSION PRODUCED IN THE SAID PRIMARY DISPERSION MEANS, OR IS REMOVED AS A SEPARATE MIDDLING PRODUCT, AND 3. SECONDARY DISPERSION OF THE FRACTION SETTLING BY GRAVITY FROM THE SAID AIR SUSPENSION IN THE SECONDARY DISPERSION MEANS ON A LOWER ELEVATION BY MEANS OF A DESIRED PART OF THE TOTAL AIR STREAM USED FOR CLASSIFICATION INTO A FINAL COARSE PRODUCT AND A FINER MIDDLING PRODUCT WHICH IS DIRECTED UPWARD WITH THE AIR MEDIUM DIRECTLY INTO THE SAID HORIZONTAL CENTRIFUGAL CLASSIFIER.
Inventors
- 👤 Risto Tapani Hukki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:12
CPC Classifications
B; B07; B07B; B07B9/00; B07B9/02; B07B7/00; B07B7/08; B07B7/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A method of pneumatically classifying finely divided solid materials comprising the steps of: a. delivering the material to be classified into an air stream to form a suspension ejecting the resulting suspension into a primary dispersion space wherein coarse material settles out by gravity, b. passing the air suspension with the finer material into a centrifugal classifying field wherein a final fine product is recovered in the air stream and a coarser middling product is separated therefrom, c. passing the settled coarse material from the primary dispersion space into an air stream to form a suspension, ejecting the resulting suspension into a secondary dispersion space wherein a final coarse product settles out by gravity from the air suspension containing middling material, and d. passing the resulting air suspension into the centrifugal field and mingling it with the air suspension from the primary dispersion space.
Claim 2
Independent Claim
144 words
A method of pneumatically classifying finely divided solid materials comprising the steps of: a. delivering the material to be classified into an air stream to form a suspension ejecting the resulting suspension into a primary dispersion space wherein coarse material settles out by gravity, b. passing the air suspension with the finer material into a centrifugal classifying field wherein a final fine product is recovered in the air stream and a coarser middling product is separated therefrom, c. passing the settled coarse material from the primary dispersion space into an air stream to form a suspension, ejecting the resulting suspension into a secondary dispersion space wherein a final coarse product settles out by gravity from the air suspension containing middling material, and d. passing the resulting air suspension into the centrifugal field and mingling it with the air suspension from the primary dispersion space.
Claim 3
Dependent Claim
192 words
A pneumatic classifier for classifying finely divided material including a housing, means providing separate primary and secondary dispersion spaces in the housing, primary and secondary dispersion means discharging respectively into the dispersion spaces, means for delivering a stream of air to each dispersion means, means for supplying finely divided material to be classified into the stream of air in the primary dispersion-means for delivery into the primary dispersion space, a centrifugal classifier, means for conducting air and material suspended therein from the primary dispersion space as a stream into the centrifugal classifier for the separation of a middling product from the fine material carried by the air stream, means for supplying coarse material settled out in the primary dispersion space into the air stream in the secondary dispersion means for delivery to the secondary dispersion space, means for conducting the air dispersion from which coarse material has settled out in the secondary dispersion space into the centrifugal classifier to mingle with the air suspension delivered thereto from the primary dispersion space, and means providing a discharge outlet structure in the centrifugal classifier for the dispersion of air and fine material circulating therein.
Claim 4
Dependent Claim
192 words
A pneumatic classifier for classifying finely divided material including a housing, means providing separate primary and secondary dispersion spaces in the housing, primary and secondary dispersion means discharging respectively into the dispersion spaces, means for delivering a stream of air to each dispersion means, means for supplying finely divided material to be classified into the stream of air in the primary dispersion-means for delivery into the primary dispersion space, a centrifugal classifier, means for conducting air and material suspended therein from the primary dispersion space as a stream into the centrifugal classifier for the separation of a middling product from the fine material carried by the air stream, means for supplying coarse material settled out in the primary dispersion space into the air stream in the secondary dispersion means for delivery to the secondary dispersion space, means for conducting the air dispersion from which coarse material has settled out in the secondary dispersion space into the centrifugal classifier to mingle with the air suspension delivered thereto from the primary dispersion space, and means providing a discharge outlet structure in the centrifugal classifier for the dispersion of air and fine material circulating therein.
Claim 5
Dependent Claim
26 words
A classifier as claimed in claim 2, including means for conducting the middling product from the centrifugal classifier into the dispersion in the primary dispersion space.
Claim 6
Dependent Claim
29 words
A classifier as claimed in claim 2, including a horizontally rotatable dispersion drum means located in the primary dispersion space adjacent to the outlet of the primary dispersion means.
Claim 7
Dependent Claim
30 words
A classifier as claimed in claim 2, including a rotatable drum like means located in the centrifugal classifier in axial alignment with the discharge outlet and extending around its periphery.
Claim 8
Dependent Claim
27 words
A classifier as claimed in claim 5, wherein the periphery of the drum like means is comprised of spaced ribs parallel to the axis of the drum.
Claim 9
Dependent Claim
40 words
A classifier as claimed in claim 5, wherein the drum-like means comprises spaced ribs parallel to the axis of the drum each rib having an isosceles angular shape in cross section pointing in the direction of rotation of the drum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |