US2354311A - Apparatus for grading powdered material - Google Patents

Apparatus for grading powdered material Download PDF

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Publication number
US2354311A
US2354311A US472030A US47203043A US2354311A US 2354311 A US2354311 A US 2354311A US 472030 A US472030 A US 472030A US 47203043 A US47203043 A US 47203043A US 2354311 A US2354311 A US 2354311A
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Prior art keywords
cyclone
air
grading
powdered material
particles
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Expired - Lifetime
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US472030A
Inventor
Harlow Walter Fred
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Rolls Royce Industrial Power India Ltd
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Int Comb Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force

Definitions

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

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  • Cyclones (AREA)

Description

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.
WALTER FRED HARLOW.
Since the air in
US472030A 1942-03-18 1943-01-11 Apparatus for grading powdered material Expired - Lifetime US2354311A (en)

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GB2354311X 1942-03-18

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494465A (en) * 1945-05-23 1950-01-10 Aerotec Corp Apparatus for classifying particles
US2624460A (en) * 1946-04-03 1953-01-06 Schutz O Neill Co Gas separator for grinding mills
US2638219A (en) * 1950-03-13 1953-05-12 Farm Production Engineers Inc Material separating apparatus
US2963230A (en) * 1954-06-30 1960-12-06 Microcyclomat Co Dry material pulverizer with integral classifier
US4133749A (en) * 1976-03-18 1979-01-09 Metallgesellschaft Aktiengesellschaft Process of separating solid granular metallurgical products and their precursors and apparatus
US4177952A (en) * 1978-04-24 1979-12-11 National Engineering Company Impact scrubber
US4218223A (en) * 1977-11-25 1980-08-19 Donaldson Company, Inc. Pre-cleaner for combustion engines
US4279743A (en) * 1979-11-15 1981-07-21 University Of Utah Air-sparged hydrocyclone and method
US4399027A (en) * 1979-11-15 1983-08-16 University Of Utah Research Foundation Flotation apparatus and method for achieving flotation in a centrifugal field
US4461702A (en) * 1981-03-16 1984-07-24 Kikkoman Corporation Classifier
US4744890A (en) * 1979-11-15 1988-05-17 University Of Utah Flotation apparatus and method
US4838434A (en) * 1979-11-15 1989-06-13 University Of Utah Air sparged hydrocyclone flotation apparatus and methods for separating particles from a particulate suspension
US4997549A (en) * 1989-09-19 1991-03-05 Advanced Processing Technologies, Inc. Air-sparged hydrocyclone separator
US5156500A (en) * 1989-10-12 1992-10-20 Skyway Development Limited Appliance for the decantation and recovery of powdery products in pneumatic conveyors

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494465A (en) * 1945-05-23 1950-01-10 Aerotec Corp Apparatus for classifying particles
US2624460A (en) * 1946-04-03 1953-01-06 Schutz O Neill Co Gas separator for grinding mills
US2638219A (en) * 1950-03-13 1953-05-12 Farm Production Engineers Inc Material separating apparatus
US2963230A (en) * 1954-06-30 1960-12-06 Microcyclomat Co Dry material pulverizer with integral classifier
US4133749A (en) * 1976-03-18 1979-01-09 Metallgesellschaft Aktiengesellschaft Process of separating solid granular metallurgical products and their precursors and apparatus
US4218223A (en) * 1977-11-25 1980-08-19 Donaldson Company, Inc. Pre-cleaner for combustion engines
US4177952A (en) * 1978-04-24 1979-12-11 National Engineering Company Impact scrubber
US4279743A (en) * 1979-11-15 1981-07-21 University Of Utah Air-sparged hydrocyclone and method
US4399027A (en) * 1979-11-15 1983-08-16 University Of Utah Research Foundation Flotation apparatus and method for achieving flotation in a centrifugal field
US4744890A (en) * 1979-11-15 1988-05-17 University Of Utah Flotation apparatus and method
US4838434A (en) * 1979-11-15 1989-06-13 University Of Utah Air sparged hydrocyclone flotation apparatus and methods for separating particles from a particulate suspension
US4461702A (en) * 1981-03-16 1984-07-24 Kikkoman Corporation Classifier
US4997549A (en) * 1989-09-19 1991-03-05 Advanced Processing Technologies, Inc. Air-sparged hydrocyclone separator
US5156500A (en) * 1989-10-12 1992-10-20 Skyway Development Limited Appliance for the decantation and recovery of powdery products in pneumatic conveyors

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