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Publication numberUS2354311 A
Publication typeGrant
Publication dateJul 25, 1944
Filing dateJan 11, 1943
Priority dateMar 18, 1942
Publication numberUS 2354311 A, US 2354311A, US-A-2354311, US2354311 A, US2354311A
InventorsHarlow Walter Fred
Original AssigneeInt Comb Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for grading powdered material
US 2354311 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

y 25, 1944- w. F. HARLOW -APPARATUS FOR GRADING POWDERED MATERIAL Filed Jan. 11,- 1943 Patented July 25, 1944 Walter Fred Harlow, Quarndon, England, assignor to International Combustion Limited. London, England, a British company Application January 11, 1943, Serial No. 472,030

InGreat Britain March 18, 1942 v 1 Claim. (01. 209-444) The present invention relates to apparatus of the cyclone type for grading powdered material,

the apparatus enabling extremely fine material to be collected from a milled product.

which the upper one receives air-borne particles, while air is introduced into the lower one.

According to the present invention, which relates to apparatus of this type, means are provided for regulating the admission of air into the lower cyclone, such means being conveniently in the form of a plurality of air admission ports arranged around the periphery of the lower cyclone, the available area of the ports bein adjusted by means of a sliding sleeve or other suitable means.

One form of construction of the invention is illustrated in the annexed drawing, in which- Fig. l. is a sectional elevation, and

Fig. 2 is a sectional plan view of the lower cyclone.

In the drawing, a is the upper cyclone, of which the lower part has an outlet a, and extends into the lower cyclone b, which isprovided near its upper surface with a plurality of air admission ports 0, of which the efiective area can be regulated by means of a sliding sleeve d.- The coarse separated particles collect in the lower part of the cyclone b, which is provided with an into the lower cyclone b, at the same time whirling round the inside surface of the connecting pipe. The spinning motion of the air in the upper-cyclone is communicated to the air in the lower cyclone as this has been found to acquire a highangular velocity. The .air which is admitted through the ports 0 has, therefore, imparted to it a rotating motion and this has to descend below the end of the connecting pipe, which it afterwards enters. It then rises to the outlet of the upper cyclone and leaves with the air originally introduced with the material. It will be seen that the particles thrown out of suspension in the top cyclone have to fall through a rising and spinning column of air, which effectively disengages the finer particles. the lower cyclone is spinning, a cyclonic or separating action takes place also in this cyclone which prevents large particles being carried up to the outlet. If the amount of admitted air through the ports is small, only the finest particles will be entrained, but the size 01' the particles can obviously be varied by adjusting the outlet e closed by a non-retum valve 1, while the fine particles are carried out of the upper cyclone.

The vortex created in the large cyclone a by I the entry of the stream of air-borne material in a tangential manner throws the solid particles to the periphery, thereby increasing their concentration to such a point that they are no longer air borne and they descend to the bottom and fall for adjusting the open area of said ports, and an annular outlet depending from the upper cyclone into the lower cyclone and terminated at a positlon below said ports.


Since the air in

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2494465 *May 23, 1945Jan 10, 1950Aerotec CorpApparatus for classifying particles
US2624460 *Apr 3, 1946Jan 6, 1953Schutz O Neill CoGas separator for grinding mills
US2638219 *Mar 13, 1950May 12, 1953Farm Production Engineers IncMaterial separating apparatus
US2963230 *Jun 30, 1954Dec 6, 1960Microcyclomat CoDry material pulverizer with integral classifier
US4133749 *Feb 28, 1977Jan 9, 1979Metallgesellschaft AktiengesellschaftProcess of separating solid granular metallurgical products and their precursors and apparatus
US4177952 *Apr 24, 1978Dec 11, 1979National Engineering CompanyImpact scrubber
US4218223 *Nov 25, 1977Aug 19, 1980Donaldson Company, Inc.Pre-cleaner for combustion engines
US4279743 *Nov 15, 1979Jul 21, 1981University Of UtahAir-sparged hydrocyclone and method
US4399027 *Aug 29, 1980Aug 16, 1983University Of Utah Research FoundationFlotation apparatus and method for achieving flotation in a centrifugal field
US4461702 *Mar 15, 1982Jul 24, 1984Kikkoman CorporationClassifier
US4744890 *Mar 21, 1986May 17, 1988University Of UtahFor separating particles from suspension such as coal and mineral ore slurries, centrifugal field
US4838434 *May 17, 1988Jun 13, 1989University Of UtahAir sparged hydrocyclone flotation apparatus and methods for separating particles from a particulate suspension
US4997549 *Sep 19, 1989Mar 5, 1991Advanced Processing Technologies, Inc.Air-sparged hydrocyclone separator
US5156500 *Oct 10, 1990Oct 20, 1992Skyway Development LimitedAppliance for the decantation and recovery of powdery products in pneumatic conveyors
U.S. Classification209/712, 209/154, 209/716
International ClassificationB07B7/08
Cooperative ClassificationB07B7/08
European ClassificationB07B7/08