US2752043A - Methods for dewatering material in a centrifugal machine - Google Patents

Methods for dewatering material in a centrifugal machine Download PDF

Info

Publication number
US2752043A
US2752043A US391681A US39168153A US2752043A US 2752043 A US2752043 A US 2752043A US 391681 A US391681 A US 391681A US 39168153 A US39168153 A US 39168153A US 2752043 A US2752043 A US 2752043A
Authority
US
United States
Prior art keywords
drum
centrifugal machine
perforated
inner drum
particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US391681A
Inventor
Pieter Van Riel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Machinefabriek Reineveld NV
Original Assignee
Machinefabriek Reineveld NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Machinefabriek Reineveld NV filed Critical Machinefabriek Reineveld NV
Priority to US391681A priority Critical patent/US2752043A/en
Application granted granted Critical
Publication of US2752043A publication Critical patent/US2752043A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/10—Other accessories for centrifuges for forming a filtering layer in the rotary bowl

Definitions

  • This invention relates to a method for dewatering material in a centrifugal machine and a machine for carrying out such method, which may comprise a distributing drum provided with blades or flights, a perforated inner drum concentrically surrounding said distributing drum and having also blades, a perforated outer drum concentrically surrounding said inner drum and said inner drum being adapted to rotate with an angular speed slightly differing from that of the distributing drum and that of the outer drum.
  • the invention has for its object to avoid said loss of fine material.
  • the material to be treated is introduced into the perforated inner drum and coarser particles of the same material are introduced into the outer drum in such a manner that said coarser particles form a displacing filtering layer on the inner side of the outer drum, the dewatered fractions being discharged together.
  • the finer particles passed through the perforated wall of the inner drum are arrested in the coarser layer formed on the inner side of the outer drum, so that said layer serves as a filter for the finer material.
  • an efficient dewatering of the material is secured as the outer drum may be provided with a relatively coarse-mesh screen wall.
  • said method is preferably carried out by means of a centrifugal machine having a conical inner drum and a conical outer drum each widening towards the discharge end.
  • the perforated inner drum 1 is provided with conveying blades 2 at its outer side and secured on a shaft 3.
  • Drum 1 is surrounded by a drum 4 having also a perforated circumferential wall and being connected to the distributing drum 6 by means of spokes 5 and provided with blades 7.
  • the drums 4 and 6 are secured to a hollow shaft 8 enclosing the shaft 3 of drum 1.
  • the shafts 3 and 8 are driven by a shaft through the medium of a pair of gear wheels 16 and 17 respectively and in such a manner that the drums 4 and 6 rotate with an angular speed slightly differing from that of the drum 1.
  • the coarser fraction of the material to be treated is supplied by the hopper 10 mounted on the stationary housing 9 and is caught by vanes 11 rotating together with the drum 1 so that the material is accelerated and enters the space between the drums 1 and 4 in order to be dewatered on the screen wall of the drum 4 and displaced downwards by the blades 2.
  • the finer fraction of the material is supplied by the hopper 12 and caught by the blades 13 arranged on the hub 14, said blades introduce the material into the inner drum 1 so that it is dewatered on the inner side of the screen wall of said drum and discharged downwards by the conveying blades 7 of drum 6.
  • Both the finer frac- 'ice tion and the coarser fraction are discharged together in a common space 18 so that the finer material joins the coarser material.
  • the fine particles escaping through the screen wall of drum 1 are further dried on the coarser layer displacing on the inner side of drum 4, whereby said layer acts as a filter, so that also the finest particles are arrested and a liquid as clean as possible is discharged, whereas still an efiicient rate of dewatering is obtained.
  • the centrifugal machine described above the largest diameter of the outer drum 4 may be 1060 mm. and its speed may be 500 revolutions per minute.
  • the number of revolutions of the inner drum 1 may differ from that of the outer drum by 1 to 5%.
  • a slurry of coal dust consisting of particles smaller than .25 mm. may be introduced in equal quantities by weight.
  • the blades 2 leave a clearance of about 3 mm. with respect to the inner side of the drum 4 and the blades 7 leave a clearance of about .1 mm. with respect to the inner side of drum 1.
  • the screen wall of drum 1 may consist of rustless steel plate having a thickness of .5 mm. and perforations of a diameter of .18 mm.
  • the screen wall of drum 4 may consist of steel plate having a thickness of 2 mm. and perforations of a somewhat larger size.
  • crystallized salt solutions such as ammonium sulfate, borax, potassium chloride, sodium chloride, potassium sulfate, calcium formiate, fine grained sodium carbonate and sodium sulfate may be treated in the centrifugal machine, the particles of different size being then obtained by varying the crystallizing process. Also finely divided substances such as pancreas glands, acetate cellulose and naphthalene may be dried in the centrifugal machine.
  • a method for dewatering material in a centrifugal machine provided with a perforated inner drum and a perforated outer drum concentrically surrounding the inner drum and rotatable with an angular speed slightly difiering from that of the inner drum, which consists in introducing into the inner drum the material to be dewatered, introducing into the outer drum particles of the same material of a larger size, the material forming a layer on the inner walls of both drums, displacing both said layers towards the discharge end of the drums, and discharging both said layers together.
  • a method for dewatering material which consists in introducing the material to be dewatered into an inner receptacle of two concentrically arranged perforate receptacles, which are adapted to be rotated at different speeds and which have a discharge end, introducing into the other receptacle particles of the same material of a larger size, the material forming a layer on the inner walls of both receptacles when the receptacles are rotating, displacing both said layers toward the discharge end of the receptacles, and discharging both said layers together.
  • a centrifugal machine comprising a distributing drum provided with blades, a perforated inner drum concentrically surrounding said distributing drum and having also blades, a perforated outer drum concentrically surrounding said inner drum, said inner drum being adapted to rotate with an angular speed slightly differing from that of said distributing drum and that of said outer drum, said inner drum and said outer drum having a common discharge end and each having a conical shape widening towards said discharge end.

Description

un 6, 9 P. VAN RIEL METHODS FOR DEWATERING MATERIAL IN A CENTRIFUGAL MACHINE Filed Nov. 12, 1953 INVENTOK PIET'EK VAN RIEL United States Patent METHODS FOR DEWATERING MATERIAL IN A CENTRIFUGAL MACHINE Pieter Van Riel, Delft, Netherlands, assignor to Machinefabriek Reineveld N. V., Delft, Netherlands, a company of the Netherlands Application November 12, 1953, Serial No. 391,681 3 Claims. (Cl. 210-69) This invention relates to a method for dewatering material in a centrifugal machine and a machine for carrying out such method, which may comprise a distributing drum provided with blades or flights, a perforated inner drum concentrically surrounding said distributing drum and having also blades, a perforated outer drum concentrically surrounding said inner drum and said inner drum being adapted to rotate with an angular speed slightly differing from that of the distributing drum and that of the outer drum.
When treating in a centrifugal machine material comprising in addition to coarser particles also finer particles, such as fine grained coal and crystallized masses, the drawback arises that together with the liquid also fine material escapes through the screen wall of the drum.
The invention has for its object to avoid said loss of fine material. According to the invention the material to be treated is introduced into the perforated inner drum and coarser particles of the same material are introduced into the outer drum in such a manner that said coarser particles form a displacing filtering layer on the inner side of the outer drum, the dewatered fractions being discharged together. The finer particles passed through the perforated wall of the inner drum are arrested in the coarser layer formed on the inner side of the outer drum, so that said layer serves as a filter for the finer material. Moreover an efficient dewatering of the material is secured as the outer drum may be provided with a relatively coarse-mesh screen wall.
According to the invention said method is preferably carried out by means of a centrifugal machine having a conical inner drum and a conical outer drum each widening towards the discharge end.
The invention will be further described with reference to the accompanying drawing showing half a sectional elevation of a centrifugal machine according to the invention.
The perforated inner drum 1 is provided with conveying blades 2 at its outer side and secured on a shaft 3. Drum 1 is surrounded by a drum 4 having also a perforated circumferential wall and being connected to the distributing drum 6 by means of spokes 5 and provided with blades 7. The drums 4 and 6 are secured to a hollow shaft 8 enclosing the shaft 3 of drum 1. The shafts 3 and 8 are driven by a shaft through the medium of a pair of gear wheels 16 and 17 respectively and in such a manner that the drums 4 and 6 rotate with an angular speed slightly differing from that of the drum 1.
The coarser fraction of the material to be treated is supplied by the hopper 10 mounted on the stationary housing 9 and is caught by vanes 11 rotating together with the drum 1 so that the material is accelerated and enters the space between the drums 1 and 4 in order to be dewatered on the screen wall of the drum 4 and displaced downwards by the blades 2.
The finer fraction of the material is supplied by the hopper 12 and caught by the blades 13 arranged on the hub 14, said blades introduce the material into the inner drum 1 so that it is dewatered on the inner side of the screen wall of said drum and discharged downwards by the conveying blades 7 of drum 6. Both the finer frac- 'ice tion and the coarser fraction are discharged together in a common space 18 so that the finer material joins the coarser material. The fine particles escaping through the screen wall of drum 1 are further dried on the coarser layer displacing on the inner side of drum 4, whereby said layer acts as a filter, so that also the finest particles are arrested and a liquid as clean as possible is discharged, whereas still an efiicient rate of dewatering is obtained.
By way of example it may be stated that the centrifugal machine described above the largest diameter of the outer drum 4 may be 1060 mm. and its speed may be 500 revolutions per minute. The number of revolutions of the inner drum 1 may differ from that of the outer drum by 1 to 5%. Into the outer drum fine grained coal and into the inner drum a slurry of coal dust consisting of particles smaller than .25 mm. may be introduced in equal quantities by weight. The blades 2 leave a clearance of about 3 mm. with respect to the inner side of the drum 4 and the blades 7 leave a clearance of about .1 mm. with respect to the inner side of drum 1. The screen wall of drum 1 may consist of rustless steel plate having a thickness of .5 mm. and perforations of a diameter of .18 mm. The screen wall of drum 4 may consist of steel plate having a thickness of 2 mm. and perforations of a somewhat larger size.
Not only fine grained coal and a slurry of coal dust but also crystallized salt solutions such as ammonium sulfate, borax, potassium chloride, sodium chloride, potassium sulfate, calcium formiate, fine grained sodium carbonate and sodium sulfate may be treated in the centrifugal machine, the particles of different size being then obtained by varying the crystallizing process. Also finely divided substances such as pancreas glands, acetate cellulose and naphthalene may be dried in the centrifugal machine.
What I claim is:
1. A method for dewatering material in a centrifugal machine provided with a perforated inner drum and a perforated outer drum concentrically surrounding the inner drum and rotatable with an angular speed slightly difiering from that of the inner drum, which consists in introducing into the inner drum the material to be dewatered, introducing into the outer drum particles of the same material of a larger size, the material forming a layer on the inner walls of both drums, displacing both said layers towards the discharge end of the drums, and discharging both said layers together.
2. A method for dewatering material which consists in introducing the material to be dewatered into an inner receptacle of two concentrically arranged perforate receptacles, which are adapted to be rotated at different speeds and which have a discharge end, introducing into the other receptacle particles of the same material of a larger size, the material forming a layer on the inner walls of both receptacles when the receptacles are rotating, displacing both said layers toward the discharge end of the receptacles, and discharging both said layers together.
3. A centrifugal machine comprising a distributing drum provided with blades, a perforated inner drum concentrically surrounding said distributing drum and having also blades, a perforated outer drum concentrically surrounding said inner drum, said inner drum being adapted to rotate with an angular speed slightly differing from that of said distributing drum and that of said outer drum, said inner drum and said outer drum having a common discharge end and each having a conical shape widening towards said discharge end.
References Cited in the file of this patent UNITED STATES PATENTS 1,334,023 Elmore Mar. 16, 1920 1,634,868 Elmore July 5, 1927 2,156,253 Clark Apr. 25, 1939

Claims (1)

1. A METHOD FOR DEWATERING MATERIAL IN A CENTRIFUGAL MACHINE PROVIDED WITH A PERFORATED INNER DRUM AND A PERFORATED OUTER DRUM CONCENTRICALLY SURROUNDING THE INNER DRUM AND ROTATABLE WITH AN ANGULAR SPEED SLIGHTLY DIFFERING FROM THAT OF THE INNER DRUM, WHICH CONSISTS IN INTRODUCING INTO THE INNER DRUM THE MATERIAL TO BE DEWATERED INTRODUCING INTO THE OUTER DRUM PARTICLES OF THE SAME MATERIAL OF A LARGER SIZE, THE MATERIAL FORMING A LAYER ON THE INNER WALLS OF BOTH DRUMS, DISPLACING BOTH SAID LAYERS TOWARDS THE DISCHARGE END OF THE DRUMS, AND DISCHARGING BOTH SAID LAYERS TOGETHER
US391681A 1953-11-12 1953-11-12 Methods for dewatering material in a centrifugal machine Expired - Lifetime US2752043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US391681A US2752043A (en) 1953-11-12 1953-11-12 Methods for dewatering material in a centrifugal machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US391681A US2752043A (en) 1953-11-12 1953-11-12 Methods for dewatering material in a centrifugal machine

Publications (1)

Publication Number Publication Date
US2752043A true US2752043A (en) 1956-06-26

Family

ID=23547539

Family Applications (1)

Application Number Title Priority Date Filing Date
US391681A Expired - Lifetime US2752043A (en) 1953-11-12 1953-11-12 Methods for dewatering material in a centrifugal machine

Country Status (1)

Country Link
US (1) US2752043A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042528A (en) * 1959-11-27 1962-07-03 New England Vinegar Works Inc Production of apple juice and vinegar stock
US3283910A (en) * 1964-04-02 1966-11-08 Western States Machine Co Centrifugal basket
US3794177A (en) * 1971-03-23 1974-02-26 Texfluid Snc Di G Cecchi Eb Continuously operating centrifugal hydroextractor provided with a mechanical timer
US3797662A (en) * 1970-11-09 1974-03-19 H Titus Pressure-filtering apparatus and filtering method
US3933649A (en) * 1971-03-01 1976-01-20 Ahlfors S E E Apparatus for purifying and fractionating particle suspensions
US4867878A (en) * 1988-06-09 1989-09-19 Membrex, Inc. Liquid bearing for rotary apparatus
US4876013A (en) * 1983-12-20 1989-10-24 Membrex Incorporated Small volume rotary filter
US4911847A (en) * 1983-12-20 1990-03-27 Membrex, Inc. Process for controlling the permeate composition in a rotary filtration device
US5256289A (en) * 1991-11-04 1993-10-26 Centrifugal & Mechanical Industries, Inc. Centrifugal separator incorporating structure to reduce abrasive wear
US5410795A (en) * 1993-10-12 1995-05-02 Centrifugal & Mechanical Industries, Inc. Method of assembly and apparatus for a screen in a centrifugal separator
US5558770A (en) * 1995-07-03 1996-09-24 Elgin National Industries, Inc. Centrifugal separator having a cone frustum
WO2020194169A1 (en) 2019-03-22 2020-10-01 Flsmidth A/S Centrifugal separator and screen having blades for same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1334023A (en) * 1916-10-07 1920-03-16 Guy H Elmore Centrifugal drier
US1634868A (en) * 1922-02-18 1927-07-05 Guy H Elmore Centrifugal drier
US2156253A (en) * 1930-02-20 1939-04-25 Centrifugal Engineering And Pa Duplex centrifugal separator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1334023A (en) * 1916-10-07 1920-03-16 Guy H Elmore Centrifugal drier
US1634868A (en) * 1922-02-18 1927-07-05 Guy H Elmore Centrifugal drier
US2156253A (en) * 1930-02-20 1939-04-25 Centrifugal Engineering And Pa Duplex centrifugal separator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042528A (en) * 1959-11-27 1962-07-03 New England Vinegar Works Inc Production of apple juice and vinegar stock
US3283910A (en) * 1964-04-02 1966-11-08 Western States Machine Co Centrifugal basket
US3797662A (en) * 1970-11-09 1974-03-19 H Titus Pressure-filtering apparatus and filtering method
US3933649A (en) * 1971-03-01 1976-01-20 Ahlfors S E E Apparatus for purifying and fractionating particle suspensions
US3794177A (en) * 1971-03-23 1974-02-26 Texfluid Snc Di G Cecchi Eb Continuously operating centrifugal hydroextractor provided with a mechanical timer
US4876013A (en) * 1983-12-20 1989-10-24 Membrex Incorporated Small volume rotary filter
US4911847A (en) * 1983-12-20 1990-03-27 Membrex, Inc. Process for controlling the permeate composition in a rotary filtration device
US4867878A (en) * 1988-06-09 1989-09-19 Membrex, Inc. Liquid bearing for rotary apparatus
US5256289A (en) * 1991-11-04 1993-10-26 Centrifugal & Mechanical Industries, Inc. Centrifugal separator incorporating structure to reduce abrasive wear
US5410795A (en) * 1993-10-12 1995-05-02 Centrifugal & Mechanical Industries, Inc. Method of assembly and apparatus for a screen in a centrifugal separator
US5558770A (en) * 1995-07-03 1996-09-24 Elgin National Industries, Inc. Centrifugal separator having a cone frustum
WO2020194169A1 (en) 2019-03-22 2020-10-01 Flsmidth A/S Centrifugal separator and screen having blades for same

Similar Documents

Publication Publication Date Title
US2752043A (en) Methods for dewatering material in a centrifugal machine
US3437209A (en) Continuous centrifugal filter construction
US3329350A (en) Pulverising apparatus
US2425984A (en) Method for cleaning capsules and the like
JP4628694B2 (en) Extrusion centrifuge
US4199459A (en) Continuous filtering-settling centrifuge
US2108502A (en) Blending machine
CN208771524U (en) A kind of raw mineral materials screening plant
US3282497A (en) Processes and apparatus for the separation of solids from a suspension
GB717654A (en) Improvements in or relating to methods of and means for separating solid particles from suspensions by filtration through screens
US3682398A (en) Apparatus for preparing paper pulp or any other product of a similar nature, from bales of cellulose or raw materials for recovery, such as waste paper
US1923455A (en) Mill-starch treatment and method
US4122014A (en) Centrifuge for removing liquid media adhering to chips, turnings, borings or the like
US3062375A (en) Rotary screening apparatus for separating different kinds of materials in mixtures
US2278459A (en) Method of cutting materials
US2204039A (en) Treatment of grain, especially wheat
US3111490A (en) Centrifuge machine
US3372810A (en) Sieve centrifuge
DE2407833A1 (en) Centrifuge for suspensions - having a longitudinally movable plough co-axially mounted inside the drum to remove sepd. solids
US3001338A (en) Plant for washing stone
US3266781A (en) Mixing machine
US3349911A (en) Fractionating apparatus
US2511585A (en) Centrifuge
US2779474A (en) Continuously operating centrifugal machine
US2999649A (en) Apparatus for continuously crushing and selectively discharging solid materials