US2863560A - Centrifuge - Google Patents

Centrifuge Download PDF

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Publication number
US2863560A
US2863560A US510406A US51040655A US2863560A US 2863560 A US2863560 A US 2863560A US 510406 A US510406 A US 510406A US 51040655 A US51040655 A US 51040655A US 2863560 A US2863560 A US 2863560A
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Prior art keywords
shaft
centrifuge
drive
gear
members
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
US510406A
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English (en)
Inventor
Linke Gerhard
Hulsen Hans-Heinrich
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.)
Siteg Siebtechnik GmbH
Siebtechnik GmbH
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Siteg Siebtechnik GmbH
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Filing date
Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/04—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl

Definitions

  • centrifuges of the kind having a screening drum, a discharge worm, or the like, and a transmission drive connecting the aforesaid two members.
  • centrifuges for continuous operation with a screening drum and a conical or cylindrical discharge member having spiral-shaped conveying and/or scraping means on its outer surface. Both members are usually mounted on horizontal or vertical shafts and rotate at diflferent speeds.
  • This centrifuge is driven from a transmission drive which provides for the difference in speed of the two centrifuge members.
  • This drive may consist of a spur gear drive, an epicyclic drive, an internal gear drive, or a cycloidal gear drive as it is described in a pamphlet on Motor Gears by Cyclo G. m. b. H., Kunststoff, Germany.
  • transmission drives especially the cycloidal gear drives have the advantage ofpermitting an arrangement of transmission wherein one shaft remains stationary while the gear casing and another member rotate. Thereby a differential movement is brought about between the gear casing and the other rotating member of the drive which are connected respectively with the screening drum and the scraper-bearing or worm drum of the centrifuge, in the case of a cycloidal gear drive the other rotating member being an eccentric disk of the drive.
  • the invention attains this object by providing a centrifuge having a transmission drive of the above mentioned type with an overload coupling between the shaft of the drive which remains stationary during normal operations, and the framework of the centrifuge.
  • the maximal torque of this overload coupling is adjustable.
  • the coupling may consist of a multiple disk clutch, a hydraulic clutch, or a cone clutch.
  • the coupling which is attached to the centrifuge frame engages the central shaft of the transmission drive and prevents rotation of the shaft. But, as soon as the differential movement of the centri fuge members is blocked, and the torque thereby exercised on the stationary shaft, exceeds the maximal torque to which the overload coupling has been designed or adjusted by adjusting means such as turnbuckles, screws, and the like, the clutch slips and the stationary shaft of the drive begins to rotate.
  • the heat originated ice by the slipping of the clutch may be eliminated for instance by way of a system of lubrication by oil circulation until the centrifuge stops.
  • Another object of the invention is to avoid an unduly prolonged slipping of the clutch by providing switch means connected with the normally stationary shaft of the drive, which switch means interrupt the operation of the motor driving the centrifuge in case of disturbances.
  • Operation of the motor may be interrupted directly by means of a switch mounted on to the stationary shaft and operating, for instance, as a centrifugal switch when the shaft rotates.
  • the switch means may also be actuated by a protrusion such as a pin fastened to the stationary shaft.
  • the stationary shaft is connected with a small gear-pump.
  • Figure 1 is a cross sectionalview of the centrifuge according to this invention.
  • Figure 2 is a sectional view of the overload clutch shown in Figure 1 including means for adjusting the maximal torque of the clutch.
  • FIG. 3 shows an embodiment of the switch means according to the invention as a centrifugal switch
  • Figure 4 shows another embodiment of the overload coupling as a hydraulic coupling.
  • centrifuge housing which comprises an internal frame 11.
  • a screening drum 12 is mounted in the housing for rotation on a shaft 13.
  • a scraper bearing discharge drum 14 is mounted for rotation on a hollow shaft 15 which co-centrically surrounds shaft 13.
  • Shaft 15 is rigidly connected with the cylindrical gear casing 16 of a cycloidal drive comprising eccentric disk portions 17. These portions engage rollers 18 mounted on a disk 19 flangedly connected to the lower end of shaft 13.
  • the cycloidal drive casing 16 is rigidly connected by means of a hollow shaft 20 to a first bevel gear 21 which engages a second bevel gear 22 mounted on a driving shaft 23 arranged at a right angle to the hollow shaft 20.
  • Shaft 23 is rotated by means of a motor (not shown).
  • the eccentric disk portions 17 of the cycloidal drive rotate around a central disk 24 flangedly connected to the shaft 25 which is mounted co-axially in the hollow shaft 20, and is held stationary under normal operation by means of a multiple disk clutch 26, the inner disks 27 of which are mounted at the lower end on the shaft 25, while the outer disks 28 are displaceably mounted in the clutch housing 29 which is rigidly attached to the inner frame 11 of the centrifuge.
  • Friction between the disks 27 and 28 is created, for instance, by springs 30 and 31; the pressure of these springs on the disk assembly and together therewith the maximal torque of the clutch are adjusted by suitable means such as adjusting screws 32 for altering the tension of the springs.
  • a small gear pump 33 is mounted in the lower part of the clutch housing 29.
  • Gear 34 of the gear pump 33 is mounted on the lower end of shaft 25, while an oil conduit 35 connects the gear pump 33 with a switch 36 which is in turn connected to the motor (not shown), by connecting means 37.
  • these means represent a centrifugal switch 38 which is mounted at the lower end of shaft in replacement of the .gear pump 33.
  • centrifugal switch 38 In its circumference the centrifugal switch 38 possesses a recess 39 wherein there is located a lever 40 pivotally mounted on disk 38 at 41.
  • a restoring spring 42 is provided to retain lever 40 in its initial position in the housing by acting against the. centrifugal forces which try to move the lever into the position indicated by dash-and-dotted lines at 40.
  • lever 40 At its shorter end the lever 40 is provided with a contact plate 43 which contacts the terminal 44 of an electric circuit 45 actuated when lever 40 adopts the position at 40' whereby the circuit 45 is closed.
  • the embodiment of the overload coupling shown in Figure 4 represents a hydraulic coupling which replaces the multiple disk clutch 29.
  • This multiple disk coupling comprises a housing 46 rigidly attached to the inner frame 11 of the centrifuge, which housing is filled with fluid and provided with a fluid discharge outlet 47 at its bottom.
  • a disk 48 is mounted on the lower end of shaft 25 and provided with blades 49, thereby acting as an impeller for the hydraulic clutch when shaft 25 rotates.
  • a centrifuge comprising a screening drum, a discharge member cooperating with said screening drum, and a transmission drive comprising a first and a second shaft connected with said screening 'drum and said discharge member respectively, said transmission drive including an input shaft adapted for being driven to impart rotation at different speeds to said screening drum and said discharge member; a third shaft operatively interconnected with said screening drum and said discharge member and forming a reaction member which remains stationary during rotation of said screening drum and said discharge member at different speeds and rotates if said screening drum and said discharge member rotate at equal speeds; a centrifuge frame; and a brake having a first and a second member normally stationary relative to each other but being relatively movable upon development of a predetermined torque therebetween, said first member being rigidly mounted in said frame, said second member being attached to the free end of said third shaft, and means operable in response to relative movement between said first and second members for interrupting the supply of power to said input shaft.
  • a transmission gear drive comprising a first and second shaft connected with said screening drum and said discharge member respectively, said drive including an input shaft adapted for being driven for imparting rotation at different speeds to said first and second shafts, said transmission drive further comprising a third shaft forming a reaction member for the transmission drive and remaining stationary during rotation of said first and second shafts at different speeds, and adapted to rotate if said first and second shafts rotate at equal speeds;
  • a brake comprising a first and a second member releasably fixed relatively, said first member being attached rigidly to said frame, said second member being drivingly connected with said third shaft, said brake being operable normally to hold said third shaft stationary when said first and second shafts rotate at said different speeds and the said first and second members thereof being relatively movable to permit rotation of said third shaft when said first and second shafts rotate at even speed thereby imparting to said third shaft a torque greater than the minimum required
  • a centrifuge comprising, in combination, a pair of cooperating centrifuging members, a transmission gear drive having an input shaft and comprising first, second, and third shaft means, said first and second shaft means being connected with and imparting different speeds to each member of said pair of cooperating centrifuging members, said third shaft means forming a reaction member and being stationary during rotation of said pair of centrifuging members at predetermined different speeds, said third shaft means being adapted to rotate if said pair of centrifuging members rotate at equal speeds; a brake connected between said third shaft means and a stationary point operable for holding said third shaft means stationary while said pair of centrifuging members rotates at said different speeds, and also operable for permitting rotation of said third shaft means when said pair of centrifuging members rotate at equal speeds, and means operable in response to rotation of said third shaft means adapted for interrupting the driving of said input shaft thereby to halt the centrifuge.
  • said switch means consist of a centrifugal switch adapted for interrupting the operation of said drive and stopping said pair of centrifuging members upon rotation of said third shaft.
  • said switch means comprise a gear pump, a gear in said gear pump being connected to the free end of said third shaft, a switch for controlling an electric current, conduit means between said gear pump and said switch for imparting pressure to said switch upon rotation of said third shaft and said gear in said gear pump connected therewith, said switch causing said electric current to interrupt the operation of said transmission gear drive and stop said pair of centrifuging members upon receiving pressure from said gear pump.
  • a centrifuge as described in claim 5, wherein said multiple disk brake comprises resilient means for urging the disks thereof into friction engagement, and adjusting means for adjusting the force of said resilient means and together therewith the minimum torque at which said brake releases said third shaft means for rotation.

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  • Centrifugal Separators (AREA)
US510406A 1949-09-16 1955-05-23 Centrifuge Expired - Lifetime US2863560A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2863560X 1949-09-16

Publications (1)

Publication Number Publication Date
US2863560A true US2863560A (en) 1958-12-09

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BE (2) BE496879A (en))
FR (2) FR1021717A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332300A (en) * 1964-06-10 1967-07-25 Dorr Oliver Inc Centrifugal equipment
CN109312982A (zh) * 2016-04-29 2019-02-05 埃尔金分离解决方案工业有限责任公司 立式切屑干燥机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176061B (de) * 1962-07-11 1964-08-13 Dieter Pohl Zuckerzentrifuge mit lotrechter Trommelwelle und einer sich nach unten konisch erweiternden Schleudertrommel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US628094A (en) * 1899-03-15 1899-07-04 Daniel H B Hooper Machine for transferring differential motion.
US1571457A (en) * 1921-11-30 1926-02-02 Orr Francis Leonard Transmission gearing
US1749368A (en) * 1927-09-01 1930-03-04 Hans C Behr Continuous separation of liquids and solids
US1921296A (en) * 1932-09-22 1933-08-08 Gen Chemical Corp Filter
US1926995A (en) * 1931-05-04 1933-09-12 Gen Chemical Corp Filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US628094A (en) * 1899-03-15 1899-07-04 Daniel H B Hooper Machine for transferring differential motion.
US1571457A (en) * 1921-11-30 1926-02-02 Orr Francis Leonard Transmission gearing
US1749368A (en) * 1927-09-01 1930-03-04 Hans C Behr Continuous separation of liquids and solids
US1926995A (en) * 1931-05-04 1933-09-12 Gen Chemical Corp Filter
US1921296A (en) * 1932-09-22 1933-08-08 Gen Chemical Corp Filter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332300A (en) * 1964-06-10 1967-07-25 Dorr Oliver Inc Centrifugal equipment
CN109312982A (zh) * 2016-04-29 2019-02-05 埃尔金分离解决方案工业有限责任公司 立式切屑干燥机
EP3449196A4 (en) * 2016-04-29 2019-12-18 Elgin Separation Solutions Industrials, LLC VERTICAL CUTTER DRYER
US10865611B2 (en) 2016-04-29 2020-12-15 Elgin Separation Solutions Industrials, Llc Vertical cuttings dryer
CN109312982B (zh) * 2016-04-29 2021-02-02 埃尔金分离解决方案工业有限责任公司 立式切屑干燥机

Also Published As

Publication number Publication date
BE496879A (en)) 1950-11-03
BE496878A (en)) 1950-11-03
FR1021718A (fr) 1953-02-23
FR1021717A (fr) 1953-02-23

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