US3494544A - Centrifugal separator - Google Patents

Centrifugal separator Download PDF

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Publication number
US3494544A
US3494544A US725446A US3494544DA US3494544A US 3494544 A US3494544 A US 3494544A US 725446 A US725446 A US 725446A US 3494544D A US3494544D A US 3494544DA US 3494544 A US3494544 A US 3494544A
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United States
Prior art keywords
disc
paring
opening
sludge
closing
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Expired - Lifetime
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US725446A
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English (en)
Inventor
Henric Wilhelm Thylefors
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.)
Alfa Laval AB
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Alfa Laval AB
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 Alfa Laval AB filed Critical 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
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl

Definitions

  • the present invention relates to a centrifugal separator of the type having channels extending radially inward from the sludge space of the rotor to a receiving chamber provided with an outlet for separated sludge.
  • a separator of this type is shown in Swedish patent specification No. 173,711.
  • This separator which can be used, for example, to separate a yeast concentrate from a yeast suspension, has a paring means displaceable in a radial direction in the receiving chamber.
  • the paring edge of the paring means When the paring edge of the paring means is displaced radially inward, the strength of the pared yeast concentrate is increased. This increase, of course, results in an increase of the viscosity of the yeast concentrate.
  • the pressure drop which forces the yeast concentrate into the paring chamber is decreased due to the radially inward displacement of the paring edge, despite the fact that the increased viscosity requires an increased pressure drop so as to counteract the increased flow resistance. This situation entails the risk of clogging the channels and consequently involves difficulties in obtaining a yeast concentrate of uniform and high strength.
  • the present invention eliminates this difiiculty by providing means for closing and opening the channel openings into the receiving chamber, such means being actuated to uncover these openings only after the sludge con centrate in the sludge space has reached the desired strength.
  • the pressure drop which forces the sludge concentrate inwardly to the outlet of the receiving chamber can be kept large as well as constant, since it is not necessary to displace the outlet opening in order to control the concentration.
  • the closing and opening means may be in the form of pistons driven hydraulically and movable in a radial direction.
  • the invention includes such means in a form which is not loaded in the closing or opening. direction.
  • the closing and opening means can be a disc of which the edge forms the closing surfaces, and which is movable in the axial direction.
  • communications are provided between both sides of the disc.
  • These communications may, of course, be constituted by grooves at the inside of the paring chamber. However, they are preferably constituted by one or more openings provided in the radially outer parts of the disc.
  • the disc can be designed as a rim with spokes.
  • the desired strength of the sludge concentrate is kept constant by controlling the opening frequency of the closing and opening means, and the duration of the opening period is kept at a predetermined constant value, for example, one or more seconds.
  • Frequency controllers filling these requirements are generally known and of different types.
  • the means actuating the closing and opening means can be driven hydraulically, pneumatically or electromagnetically.
  • Automatic control of the strength of the sludge concentrate can be obtained by inserting in the outlet from the receiving chamber a meter sensitive to changes in the concentration of the sludge, for example, a viscosity meter, and arranging for this meter to actuate the closing means, preferably via a frequency controlling means. Consequently, in the latter case the meter does not directly determine the point .of time for the next opening but determines the frequency with which the closing and opening means are operated.
  • the outlet from the receiving chamber is formed by a paring means.
  • a centrifugal rotor 1 has a cover 2 secured to the rotor by a locking ring 3.
  • the rotor is mounted on and driven by a hollow spindle 5 and has a separating chamber containing a conical disc set 6, the rotor also having a distributor 7 with radial vanes 8.
  • the stationary pipe for supplying the liquid to be separated is shown at 9.
  • the outlet for separated liquid is formed by a paring chamber 10 containing a stationary paring disc 11 with a paring channel 12.
  • a paring chamber 13 having a stationary paring tube 14 inserted therein.
  • bent pipes one of which is shown at 15, extending from the sludge space 16 radially inward to the paring chamber 13.
  • a disc 17 having a peripheral edge which, in the position shown in the drawing, closes the openings of the pipes 15 into the chamber 13.
  • the disc 17 is provided along its periphery with openngs 18 located between the openngs of the pipes 15 and which allow communication between the spaces above and below the disc 17.
  • a spring 19 presses the disc 17 upward against abutments formed by the heads of three bolts, one of which is shown at 20, screwed to the rotor bottom.
  • a spindle 21 secured to the disc 17 is provided at its lower end with a magnet core 22 which, when attracted by energization of a magnet coil 23, pulls the spindle and consequently the disc 17 downward until the latter strikes against the top of the spindle 5.
  • the paring tube 14 is connected to an outlet pipe-line 24 for the sludge concentrate.
  • a yeast suspension is to be separated.
  • the latter which can have any arbitrary yeast concentration, is supplied through the pipe-line 9 and flows through the distributor 7 outward into the separating chamber outside the disc set 6. Clean separated liquid flows from the inner edges of the disc set into the paring chamber 10 and is discharged from the latter by means of the paring disc 11. Separated yeast is collected in the sludge space 16. The concentration of the yeast in the sludge space increases as the period of time between the sludge discharges increases, but decreases as the opening (discharge) periods of time increase. Thus, the yeast concentration can be controlled by means of these two factors of time.
  • the operation is usually such that the opening period of time is kept constant and the period of time between the openings is controlled.
  • a viscosity meter 26 is inserted in the pipe-line 24.
  • This meter has an operative connection 27 to a controller 28 for regulating the frequency with which current is supplied to the magnet coil 23 through conductors 29. Consequently, under constant conditions of operation the disc 17 will uncover the openings of the pipes 15 With a certain frequency, and the yeast concentrate discharged by the paring tube 14 will have a strength corresponding to this frequency.
  • the meter 26 senses an increased viscosity of the yeast concentrate, the meter adjusts the frequency controller 28 to provide an increased frequency, whereby the yeast discharges take place more often and the strength of the yeast concentrate is lowered, until the desired concentration is reached. If the sensed viscosity is decreased, this control takes place in the opposite manner.
  • the disc 17 constitutes means for closing and opening the openings of pipes 15 into the receiving chamber 13; and the parts 21, 22, 23 and 26 through 29 constitute means for actuating the disc 17 with an opening frequency determined by the viscosity of the concentrate discharging through pipeline 24.
  • the chamber 13 can have a number of outlets in the form of holes 25 in the rotor bottom.
  • One of the holes is shown with dotted lines so as to indicate that it is an alternative of the paring means 14.
  • a centrifugal separator having a separating chamber provided with a peripheral sludge space and also having an inlet 1 to said chamber the rotor also having a receiving cham her and channels extending radially inward from the sludge space to the receiving chamber, said channels having openings into the receiving chamber, said receiving chamber having an outlet, and means for closing and opening said channel openings into the receiving chamber.
  • closing and opening means include a disc having an edge which forms closing surfaces coacting with said channel openings.

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  • Centrifugal Separators (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
US725446A 1967-05-10 1968-04-30 Centrifugal separator Expired - Lifetime US3494544A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE651767 1967-05-10

Publications (1)

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US3494544A true US3494544A (en) 1970-02-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
US725446A Expired - Lifetime US3494544A (en) 1967-05-10 1968-04-30 Centrifugal separator

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US (1) US3494544A (de)
DE (1) DE1657270A1 (de)
FR (1) FR1554226A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761014A (en) * 1971-05-12 1973-09-25 Mse Holdings Ltd Centrifuging apparatus
US3797736A (en) * 1972-04-07 1974-03-19 Westfalia Separator Ag Method and apparatus for controlling the concentration factor of a discharge
US4347971A (en) * 1977-03-03 1982-09-07 Joy Manufacturing Company Centrifuge apparatus
US4392846A (en) * 1981-05-18 1983-07-12 Joy Manufacturing Company Centrifuge apparatus
US4432748A (en) * 1976-09-03 1984-02-21 Joy Manufacturing Company Centrifuge apparatus and method of operating a centrifuge
DE3152411C2 (de) * 1980-10-03 1986-08-21 United States Surgical Corp., Norwalk, Conn. Chirurgisches Instrument zum Abbinden und Durchtrennen eines Körpergewebes
US5024648A (en) * 1987-10-08 1991-06-18 Alfa-Laval Separation Ab Centrifugal separator with a discharge device
US20140057772A1 (en) * 2010-10-14 2014-02-27 Gea Mechanical Equipment Gmbh Phase-separation method for a product, using a centrifuge
US11511214B2 (en) 2016-09-06 2022-11-29 Alfa Laval Corporate Ab Method for cleaning fuel oil for a diesel engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2842967C2 (de) * 1978-10-02 1984-08-16 Westfalia Separator Ag, 4740 Oelde Kontinuierlich arbeitende Schleudertrommel zum Konzentrieren suspendierter Feststoffe
SE449951B (sv) * 1983-03-16 1987-06-01 Alfa Laval Ab Centrifugalseparator med central slamutmatning

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955754A (en) * 1958-07-11 1960-10-11 Nyrop Aage Centrifugal separator
US3167509A (en) * 1961-06-13 1965-01-26 Westfalia Separator Ag Centrifugal separator
US3272430A (en) * 1962-11-06 1966-09-13 Separator Ab Sluidge centrifuge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955754A (en) * 1958-07-11 1960-10-11 Nyrop Aage Centrifugal separator
US3167509A (en) * 1961-06-13 1965-01-26 Westfalia Separator Ag Centrifugal separator
US3272430A (en) * 1962-11-06 1966-09-13 Separator Ab Sluidge centrifuge

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761014A (en) * 1971-05-12 1973-09-25 Mse Holdings Ltd Centrifuging apparatus
US3797736A (en) * 1972-04-07 1974-03-19 Westfalia Separator Ag Method and apparatus for controlling the concentration factor of a discharge
US4432748A (en) * 1976-09-03 1984-02-21 Joy Manufacturing Company Centrifuge apparatus and method of operating a centrifuge
US4347971A (en) * 1977-03-03 1982-09-07 Joy Manufacturing Company Centrifuge apparatus
DE3152411C2 (de) * 1980-10-03 1986-08-21 United States Surgical Corp., Norwalk, Conn. Chirurgisches Instrument zum Abbinden und Durchtrennen eines Körpergewebes
US4392846A (en) * 1981-05-18 1983-07-12 Joy Manufacturing Company Centrifuge apparatus
US5024648A (en) * 1987-10-08 1991-06-18 Alfa-Laval Separation Ab Centrifugal separator with a discharge device
US20140057772A1 (en) * 2010-10-14 2014-02-27 Gea Mechanical Equipment Gmbh Phase-separation method for a product, using a centrifuge
US9561513B2 (en) * 2010-10-14 2017-02-07 Gea Mechanical Equipment Gmbh Method for discharging a heavier liquid phase by adjusting a discharge radius based on a viscosity of the heavier liquid phase
US11511214B2 (en) 2016-09-06 2022-11-29 Alfa Laval Corporate Ab Method for cleaning fuel oil for a diesel engine

Also Published As

Publication number Publication date
DE1657270A1 (de) 1971-02-11
FR1554226A (de) 1969-01-17

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