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US3741467A - Centrifugal separator - Google Patents

Centrifugal separator Download PDF

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Publication number
US3741467A
US3741467A US00057056A US3741467DA US3741467A US 3741467 A US3741467 A US 3741467A US 00057056 A US00057056 A US 00057056A US 3741467D A US3741467D A US 3741467DA US 3741467 A US3741467 A US 3741467A
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United States
Prior art keywords
poly
coating
liquid
rotor
discs
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Expired - Lifetime
Application number
US00057056A
Inventor
O Kjellgren
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Alfa Laval AB
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Alfa Laval AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
    • B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/12—Inserts, e.g. armouring plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/12—Inserts, e.g. armouring plates
    • B04B7/14—Inserts, e.g. armouring plates for separating walls of conical shape

Definitions

  • the present invention relates to a centrifugal separator having a source of supply of a liquid to be separated, and it relates more particularly to a novel arrangement for solving the problems incident to deposits in the interior of the centrifugal rotor, especially deposits on the discs which are used for increasing the separation efficiency. Such deposits reduce the throughput rate of the separator if its separation capability is to be maintained unchanged.
  • the rotor body and its inner parts are made of stainless steel, and the surfaces of the rotor parts which contact the liquid are polished so as to prevent as much as possible the accumulation of deposits on these surfaces. In spite of this polishing, deposits are formed which must be removed periodically so that the desired separation capability can be maintained.
  • the surface contacting the liquid can be made of a coating of fluorinated poIy-alkene on a support such as the inside of the rotor or said discs.
  • the invention has'given good results in theseparation of yeast-containing wort, milk used for cheesemaking and also ordinary milk, in which yeast cells and caseine, respectively, have the tendency to form heavy deposits in the interior of the rotor and especially in any disc set which may be provided.
  • yeast cells and caseine respectively
  • the interspaces between the discs in the disc set are easily clogged in a conventional centrifuge.
  • tests have proved that if cheese-making milk is separated in a centrifuge having a disc set in which certain discs are made of stainless steel and other discs are coated with poly-tetrafluoro-ethylene, the latter discs are completely free from deposits after the interruption of the separating operation, although the discs of stainless steel have heavy deposits of caseine.
  • centrifuge types in which the present invention can be used to advantage are those disclosed in the Swedish Pat. specifications Nos. 193,813, 219,547 and 310,866.
  • FIG. 1 is a vertical sectional view of an example of a centrifuge embodying the invention.
  • FIG. 2 is an enlarged fragmentary view, in vertical section, of one of the discs illustrated in FIG. 1 and showing the coating thereon.
  • FIG. 1 The centrifuge illustrated in FIG. 1 is disclosed in U. S. Pat. No. 3,468,475 granted Sept. 23, 1969 (said disclosure being incorporated herein by reference); and it will be understood that the aforesaid coating of a polyalkene at least partly fluorinated is applied to a surface within the rotor 1 which comes into contact with the liquid to be separated, this liquid being fed into the rotor through the stationary inlet pipe 5. More particularly, the coating is applied to the surface of any of the parts 12, 13, l5, l6 and 24 or to the internal surface of the rotor body 1 and its cover 2, and it may be applied to all of these surfaces. This coating is too thin to be capable of illustration in FIG. 1; but in FIG. 2 illustrating an enlarged fragmentary view of one of the discs 15 in FIG. 1, the coating is shown at 32 on each surface of the disc. I
  • a centrifugal separator the combination of a centrifugal rotor, means for delivering into the rotor a liquid to be separated, a set of conical discs in the rotor for increasing the separating efficiency and which forms surfaces coming into contact with said liquid, and a coating of at least a partly fluorinated polyalkene on said disc surfaces for resisting clogging of the disc set.

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  • Centrifugal Separators (AREA)
  • Dairy Products (AREA)

Abstract

In a centrifugal separator having a source of supply of a liquid to be separated, a surface of the separator which contacts the liquid is coated with a poly-alkene which is at least partly fluorinated.

Description

[ 1 June 26, 1973 United States Patent [191 Kjellgren CENTRIFUGAL SEPARATOR 75 Inventor: Ove Allan Valentin Kjellgren,
' Stockholm, Sweden [73] Assignee: Alia-Laval] AB, Tumba, Sweden July 22, 1970 OTHER PUBLICATIONS [22] Filed:
[21] Appl. No.: 57,056
Modern Plastics Encyclopedia, 1967, pages 153-156 1 Foreign Application Priority Data Primary Examiner-George H'. Krizmanich July 24, 1969 Sweden.....;................;...... 10414/69 AtwmeyDavis, Roxie, Faithfull & pg
fr. 00 8 Um D. M Wu me em f mo me m T n C nu A w 3 m m M A mm m WP w mam K0 rt md CU n r 1 ma 0 3, E0D1. 1/ 42 Il ,9 3 ,0 3b 4. l. 24 ,0l 2 1B ,3 4 s w M 3 3 m, 2 2 u 0 "W1 6 mm4 3 NW9 M62 .Mm7 m m mm oo mmm .r "mm mus .n 3 a sm." UIF, 1.1 11 218 555 1.1.1
which contacts the iiquid is coated with a poly-alkene which is at least partly fluorinated.
['56] Refe 'ences Cited STATES PATENTS 6 Claims, 2 Drawing Figures CENTRIFUGAL SEPARATOR The present invention relates to a centrifugal separator having a source of supply of a liquid to be separated, and it relates more particularly to a novel arrangement for solving the problems incident to deposits in the interior of the centrifugal rotor, especially deposits on the discs which are used for increasing the separation efficiency. Such deposits reduce the throughput rate of the separator if its separation capability is to be maintained unchanged.
In modern centrifugal separators, the rotor body and its inner parts are made of stainless steel, and the surfaces of the rotor parts which contact the liquid are polished so as to prevent as much as possible the accumulation of deposits on these surfaces. In spite of this polishing, deposits are formed which must be removed periodically so that the desired separation capability can be maintained.
It has now been found possible to extend very substantially the intervals between the points of time when deposits must be removed if the rotor surfaces coming into contact with the liquid are made of certain other materials than the stainless steel. More exactly, it has been proved through extensive tests that there are materials which have a stronger tendency than polished stainless steel to repel from the surface those deposits which have been centrifugally separated from the liquid. Such materials are completely or partly fluorinated polyalkenes, such as poly-(tetrafluoro-ethylene perfluoropropene), poly-chlorotrifluoro-ethylene, poly-vinylidene-fluoride and poly-vinylfluoride. It has been found that poly-tetrafluoroethylene is especially suitable. Consequently, according to the invention, the surface contacting the liquid can be made of a coating of fluorinated poIy-alkene on a support such as the inside of the rotor or said discs.
The invention has'given good results in theseparation of yeast-containing wort, milk used for cheesemaking and also ordinary milk, in which yeast cells and caseine, respectively, have the tendency to form heavy deposits in the interior of the rotor and especially in any disc set which may be provided. Thus, the interspaces between the discs in the disc set are easily clogged in a conventional centrifuge. However, as an example of the efficacy of the present invention, tests have proved that if cheese-making milk is separated in a centrifuge having a disc set in which certain discs are made of stainless steel and other discs are coated with poly-tetrafluoro-ethylene, the latter discs are completely free from deposits after the interruption of the separating operation, although the discs of stainless steel have heavy deposits of caseine.
Examples of centrifuge types in which the present invention can be used to advantage are those disclosed in the Swedish Pat. specifications Nos. 193,813, 219,547 and 310,866.
For a better understanding of the invention, reference may be had to the accompanying drawing in' which FIG. 1 is a vertical sectional view of an example of a centrifuge embodying the invention; and
FIG. 2 is an enlarged fragmentary view, in vertical section, of one of the discs illustrated in FIG. 1 and showing the coating thereon.
The centrifuge illustrated in FIG. 1 is disclosed in U. S. Pat. No. 3,468,475 granted Sept. 23, 1969 (said disclosure being incorporated herein by reference); and it will be understood that the aforesaid coating of a polyalkene at least partly fluorinated is applied to a surface within the rotor 1 which comes into contact with the liquid to be separated, this liquid being fed into the rotor through the stationary inlet pipe 5. More particularly, the coating is applied to the surface of any of the parts 12, 13, l5, l6 and 24 or to the internal surface of the rotor body 1 and its cover 2, and it may be applied to all of these surfaces. This coating is too thin to be capable of illustration in FIG. 1; but in FIG. 2 illustrating an enlarged fragmentary view of one of the discs 15 in FIG. 1, the coating is shown at 32 on each surface of the disc. I
I I claim:
1. In a centrifugal separator, the combination of a centrifugal rotor, means for delivering into the rotor a liquid to be separated, a set of conical discs in the rotor for increasing the separating efficiency and which forms surfaces coming into contact with said liquid, and a coating of at least a partly fluorinated polyalkene on said disc surfaces for resisting clogging of the disc set.
2. The combination according to claim 1, in which said coating is poly-(tetrafluoro-ethylene-perfluoropropene).
3. The combination according to claim 1, in which said coating is poly-chlorotrifluoro-ethylene.
4. The combination according to claim 1, in which said coating is poIy-vinylidenefluoride.
5. The combination according to claim 1, in which said coating is poly-vinylfluoride.
6. The combination according to claim 1, in which said coating is poly-tetrafluoro-ethylene.

Claims (5)

  1. 2. The combination according to claim 1, in which said coating is poly-(tetrafluoro-ethylene-perfluoro-propene).
  2. 3. The combination according to claim 1, in which said coating is poly-chlorotrifluoro-ethylene.
  3. 4. The combination according to claim 1, in which said coating is poly-vinylidenefluoride.
  4. 5. The combination according to claim 1, in which said coating is poly-vinylfluoride.
  5. 6. The combination according to claim 1, in which said coating is poly-tetrafluoro-ethylene.
US00057056A 1969-07-24 1970-07-22 Centrifugal separator Expired - Lifetime US3741467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1041469 1969-07-24

Publications (1)

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US3741467A true US3741467A (en) 1973-06-26

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US (1) US3741467A (en)
DE (1) DE2033646A1 (en)
ES (1) ES382105A1 (en)
FR (1) FR2053121B1 (en)
GB (1) GB1245390A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002153A1 (en) * 1980-12-23 1982-07-08 Co Inc Donaldson Self-purging centrifuge
US4701158A (en) * 1985-10-30 1987-10-20 Alfa-Laval Separation Ab Centrifugal separator
US6033356A (en) * 1996-04-02 2000-03-07 Westfalia Separator Ag Centrifugal drum with increased flow resistance
US6468198B1 (en) * 1998-08-04 2002-10-22 Westfalia Separator Ag Method and device for adjusting the liquid content of a solid withdrawn from a self-discharging centrifugal drum of a separator
US20070066476A1 (en) * 2003-07-10 2007-03-22 Westfalia Separator Ag Centrifuge comprising a separator disc stack and separator disc
WO2012150125A3 (en) * 2011-05-02 2012-12-27 Gea Mechanical Equipment Gmbh Centrifuge comprising separator disks
WO2013079194A2 (en) 2011-11-28 2013-06-06 Alfa Laval Corporate Ab Centrifugal separator with anti-fouling properties
US10888880B2 (en) 2016-02-22 2021-01-12 Alfa Laval Corporate Ab Conical disk having a check valve, and a centrifuge rotor, a centrifugal separator, and a method of separation using the conical disk

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695246A (en) * 1950-09-02 1954-11-23 Et Oakes Corp Apparatus for foaming rubber and method of coating same
US2883103A (en) * 1953-03-09 1959-04-21 Technicon International Ltd Centrifuge apparatus and method
US3079069A (en) * 1958-05-16 1963-02-26 Separator Ab Self-opening sludge centrifuge
US3104225A (en) * 1960-01-29 1963-09-17 Lourdes Instr Corp Continuous flow centrifuge rotor and liner element
US3519199A (en) * 1969-04-03 1970-07-07 Baker Perkins Inc Solids handling centrifugal extractor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695246A (en) * 1950-09-02 1954-11-23 Et Oakes Corp Apparatus for foaming rubber and method of coating same
US2883103A (en) * 1953-03-09 1959-04-21 Technicon International Ltd Centrifuge apparatus and method
US3079069A (en) * 1958-05-16 1963-02-26 Separator Ab Self-opening sludge centrifuge
US3104225A (en) * 1960-01-29 1963-09-17 Lourdes Instr Corp Continuous flow centrifuge rotor and liner element
US3519199A (en) * 1969-04-03 1970-07-07 Baker Perkins Inc Solids handling centrifugal extractor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Modern Plastics Encyclopedia, 1967, pages 153 156 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002153A1 (en) * 1980-12-23 1982-07-08 Co Inc Donaldson Self-purging centrifuge
US4350282A (en) * 1980-12-23 1982-09-21 Donaldson Company, Inc. Self-purging centrifuge
US4701158A (en) * 1985-10-30 1987-10-20 Alfa-Laval Separation Ab Centrifugal separator
US6033356A (en) * 1996-04-02 2000-03-07 Westfalia Separator Ag Centrifugal drum with increased flow resistance
US6468198B1 (en) * 1998-08-04 2002-10-22 Westfalia Separator Ag Method and device for adjusting the liquid content of a solid withdrawn from a self-discharging centrifugal drum of a separator
JP2009514657A (en) * 2003-07-10 2009-04-09 ウエストファリア セパレーター アーゲー Centrifuge with separation disk stack and separation disk
US20070066476A1 (en) * 2003-07-10 2007-03-22 Westfalia Separator Ag Centrifuge comprising a separator disc stack and separator disc
JP4856540B2 (en) * 2003-07-10 2012-01-18 ウエストファリア セパレーター アーゲー Centrifuge with separation disk laminate and separation disk
EP1644121B2 (en) † 2003-07-10 2015-07-15 GEA Westfalia Separator GmbH Separator disc and centrifuge comprising such separator discs
WO2012150125A3 (en) * 2011-05-02 2012-12-27 Gea Mechanical Equipment Gmbh Centrifuge comprising separator disks
CN103547374A (en) * 2011-05-02 2014-01-29 Gea机械设备有限公司 Centrifuge
CN103547374B (en) * 2011-05-02 2015-07-01 Gea机械设备有限公司 Centrifuge
WO2013079194A2 (en) 2011-11-28 2013-06-06 Alfa Laval Corporate Ab Centrifugal separator with anti-fouling properties
US10888880B2 (en) 2016-02-22 2021-01-12 Alfa Laval Corporate Ab Conical disk having a check valve, and a centrifuge rotor, a centrifugal separator, and a method of separation using the conical disk

Also Published As

Publication number Publication date
FR2053121B1 (en) 1976-03-05
ES382105A1 (en) 1973-04-01
DE2033646A1 (en) 1971-03-11
GB1245390A (en) 1971-09-08
FR2053121A1 (en) 1971-04-16

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