US2868381A - Supply control for a push-type centrifuge - Google Patents

Supply control for a push-type centrifuge Download PDF

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Publication number
US2868381A
US2868381A US595425A US59542556A US2868381A US 2868381 A US2868381 A US 2868381A US 595425 A US595425 A US 595425A US 59542556 A US59542556 A US 59542556A US 2868381 A US2868381 A US 2868381A
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United States
Prior art keywords
centrifuge
motor
push
supply
supply control
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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
US595425A
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English (en)
Inventor
Siegrist Rudolf
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.)
Sulzer Escher Wyss AG
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Escher Wyss AG
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 Escher Wyss AG filed Critical Escher Wyss AG
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Publication of US2868381A publication Critical patent/US2868381A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor

Definitions

  • the push-type centrifuge is a continuously operating machine.
  • the material to be centrifuged flows uninterruptedly to the uniformly rotating machine.
  • the liquid is continuously hurled through the strainers.
  • the solid material is continuously passed through the drum and thrust into the receiver.
  • the material to be centrifuged which is always a mixture of liquids and solids, is usually led into the centrifuge from a container.
  • a throttle element is provided the size of the opening in which can be varied from the outside. If the pressure head in the container, the concentration of the mixture, the structure ofthe solids or the viscosity of the liquids changes, the throttle element must be adjusted accordingly. Variations of the kind indicated always occur. Apart from the fact that the influence on the quantity by the variations which occur in the material can not be readily observed, manual adjustment always permits certain irregularities in the feed for the centrifuge.
  • the invention aims to provide an automatic feed for the centrifuge, in which the influence of the said variations in the material on the quantity is practically negligible, this being of particular advantage to centrifuges used in the sugar industry.
  • the method according to the invention for operating the centrifuge is characterized in that the supply of material to the centrifuge is influenced in the sense of constantly maintaining a predetermined value of the power input to the centrifuge.
  • the method is based on the fact that the power input to the centrifuge forms a basis for measuring the supply quantity of the material because a part of the power is used for accelerating the supplied material to the peripheral velocity of the drum. If for any reason the supply quantity increases then that creates a corresponding increase in the power input to the centrifuge and, by reason of this increase in power input and in accordance with the method of the invention, the supply quantity is reduced, i. e. the change in the supply quantity which caused the increased power input is counteracted.
  • the drawing shows an example of an arrangement for implementing the method according to the invention.
  • the method will also be described by way of example with reference to this arrangement.
  • a straining drum 2 rotates in a housing 1, the material being distributed over the drum by a rotating funnel 3.
  • An axially reciprocating pusher member 4 serves to convey the material on the drum axially towards the outlet.
  • the drum is driven by an electric driving motor 6 through a belt drive 5.
  • the motor is supplied with electric energy through conductors 7.
  • the material is led from a container 8 having a stirrer a 2,888,881 Patented Jan. 13, 1959 9 through a pipe 10into the funnel 3 of the centrifuge.
  • the supply is controlled by a throttle element 11 built into the container 8 at'the connection for the pipe 10. It is connected'to a rod 12 pivoted to a lever 14 which can tilt about a pivot 13.
  • a reversible auxiliary motor 15 driving a screw 16 serves to adjust the throttle element.
  • the screw engages a nut 17. on the, free end of the lever 14.
  • the throttle element 11. is opened or closed depending on the sense of rotation of the auxiliary motor 15.
  • the auxiliary motor 15 is fed from mains 18.
  • -A lead 19 to the motor 15 is taken from one of the conductors ofthese mains.
  • One circuit is closed for each of two positions of a contact arm Nico-operating with contacts 21 and 22; one circuit being the conductor 15 the auxiliary motor 15, a conductor 23 connected there to, the contact 21, the contact arm 20 and a conductor 24 to the second conductor of the mains 18; the other circuit is the conducto'r l9, the auxiliary motor 15, a conductor 25 connected thereto, the contact 22, the contact arm 20 and the conductor 24 to the second conductor of the mains.
  • the circuit 19, 23, 20, 24 drives themotor 15 in a sense to close the throttle element 11 whilst the.circuit ⁇ 19,2'5, 2l), 24 drives the motor 15 in the reverse sense. i
  • the arm 20 is connected to a balance beam 26 which is influenced by two electromagnets 27 and 28.
  • the electromagnet 27 islfed from a current transformer 22 by one of the conductors [7fleading to the motor 6 for the centrifuge. It'infiuences one side of the beam 26. The other side is infiuenced .by the magnet 28 the current for which is derived from the mains. 18 Via a rheostat 30.
  • the arrangement operates as follows: When operating normally, the rheostat 30 is set so that the magnets 27 and 28 balance the beam 26 which is in its mid-position. The arm 20 is thus between the contacts 21 and 22 connected to the conductors 23 and 25. No current is therefore supplied to the motor 15.
  • a decrease in material supplied to the centrifuge reacts oppositely to lower the power input to the motor 6.
  • the current to the electromagnet 27 decreases and the magnet 28 is the more powerful.
  • the beam 26 turns counterclockwise and the arm 20 closes the circuit 19, 25, 24 by striking the contact 22. This causes the motor 15 to rotate in a sense. to open the element 11. This stage opened when the power input decreases and closed when it increases.
  • the element responding to changes in power input can co-operate with a different type of arrangement for controlling the "supply of material, for example a slide, a dispensing mechanism, a piston pump, a centrifugal pump or the like.
  • the quantity per unit time is determined by the setting of the rheostat 30. Since changes in the consistency of the mixture and the quantity of the mixture setup changes in the quantity of solids separated out in the centrifuge, it may be advantageous to accompany adjustment of the quantity controlling throttle element 11 by changes in the number of strokes per minute of the thrust mechanism and, if necessary, changes in the quantity of washing media.
  • a centrifuge of the type including a rotary drive motor, a rotary foraminous drum driven by the motor for separating the solid and liquid components of the material being centrifuged, a pusher member encircled by the drum and shiftable therein in the direction of the drum axis, means forming a rotary drive connection between the pusher member and the drive motor, a flaring distributor member connected with the pusher member and defining therewith a distribution chamber, an inlet to said chamber located on the axis of rotation of the distributor, and an outlet from said chamber adjacent the drum; means for feeding material to be centrifuged to the inlet; a flow control element shiftable in opposite directions from a mid position to increase and decrease the rate of feed of said material; and actuating means responsive to the power drawn by the drive motor for shifting the flow control element in the flow rate increasing direction when the power decreases below a predetermined value and in the flow rate decreasing direction when the power increases above that value.
  • the means for feeding material to the inlet includes a supply passage connected with the inlet; and in which the flow control element is a throttle valve located in the supply passage.
  • the drive motor is an electric motor and the actuating means comprises a reversible auxiliary electric motor for shifting the throttle valve; first and second circuits for supplying electrical energy to the auxiliary motor to drive it in flow rate increasing and decreasing directions, respec tively; a source of electrical energy; switch means for selectively connecting the first and second circuits with the source of electrical energy; and means responsive to the electrical input to the drive motor for causing the switch means to connect the first circuit with the source when the input decreases below a predetermined value and to rconnect the second circuit with the source when the input increases above that value.

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  • Centrifugal Separators (AREA)
US595425A 1955-07-12 1956-07-02 Supply control for a push-type centrifuge Expired - Lifetime US2868381A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH826034X 1955-07-12

Publications (1)

Publication Number Publication Date
US2868381A true US2868381A (en) 1959-01-13

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ID=4539936

Family Applications (1)

Application Number Title Priority Date Filing Date
US595425A Expired - Lifetime US2868381A (en) 1955-07-12 1956-07-02 Supply control for a push-type centrifuge

Country Status (5)

Country Link
US (1) US2868381A (de)
CH (1) CH330940A (de)
DE (1) DE1031223B (de)
FR (1) FR1151906A (de)
GB (1) GB826034A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497385A (en) * 1961-10-09 1970-02-24 Cf & I Engineers Control of solution input to continuous centrifugal
US3497386A (en) * 1965-09-29 1970-02-24 American Factors Ass Ltd Automatic control system for load-carrying rotors
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2633477C2 (de) * 1976-07-26 1985-01-31 Paul 6702 Bad Dürkheim Schlöffel Verfahren und Vorrichtungen zum Entwässern von Feststoffsuspensionen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US911652A (en) * 1906-03-23 1909-02-09 Separator Ab Centrifugal machine.
US1783036A (en) * 1928-03-22 1930-11-25 Gen Electric Control mechanism for centrifugal compressors and method of operating the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US911652A (en) * 1906-03-23 1909-02-09 Separator Ab Centrifugal machine.
US1783036A (en) * 1928-03-22 1930-11-25 Gen Electric Control mechanism for centrifugal compressors and method of operating the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497385A (en) * 1961-10-09 1970-02-24 Cf & I Engineers Control of solution input to continuous centrifugal
US3497386A (en) * 1965-09-29 1970-02-24 American Factors Ass Ltd Automatic control system for load-carrying rotors
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator
US11833458B2 (en) * 2019-11-18 2023-12-05 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Also Published As

Publication number Publication date
CH330940A (de) 1958-06-30
GB826034A (en) 1959-12-23
FR1151906A (fr) 1958-02-07
DE1031223B (de) 1958-05-29

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