EP0136686A2 - Dispositif de suspension pour rotor de centrifuge - Google Patents

Dispositif de suspension pour rotor de centrifuge Download PDF

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Publication number
EP0136686A2
EP0136686A2 EP84111692A EP84111692A EP0136686A2 EP 0136686 A2 EP0136686 A2 EP 0136686A2 EP 84111692 A EP84111692 A EP 84111692A EP 84111692 A EP84111692 A EP 84111692A EP 0136686 A2 EP0136686 A2 EP 0136686A2
Authority
EP
European Patent Office
Prior art keywords
rotor
suspension system
connection point
flexible
collar
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.)
Withdrawn
Application number
EP84111692A
Other languages
German (de)
English (en)
Other versions
EP0136686A3 (fr
Inventor
William Andrew Romanauskas
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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
Priority claimed from US06/539,364 external-priority patent/US4511350A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0136686A2 publication Critical patent/EP0136686A2/fr
Publication of EP0136686A3 publication Critical patent/EP0136686A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/12—Suspending rotary bowls ; Bearings; Packings for bearings

Definitions

  • This invention relates to a centrifuge rotor and, in particular, to a suspension system for a centrifuge rotor.
  • a rotating body such as a centrifuge rotor.
  • two events must occur simultaneously.
  • the rotor's principle axis, the axis through the rotor's center of gravity. must lie parallel to the rotor's spin axis, the axis passing through the geometric center of the rotor.
  • the rotor's center of gravity must lie on the spin axis. If these two events were enabled to occur more quickly after rotor start-up, then the rotor would pass through its critical speed at an earlier time (i.e., at a lower speed) thus reducing the vibration caused by a given amount of rotor unbalance.
  • a suspension system for a centrifuge rotor having a weight W which makes satisfaction of each of the two conditions for the attainment of critical speed independent of each other. As a result, the critical speed of the rotor is lowered.
  • the rotor suspension system embodying the teachings of this invention comprises a coupling member having a first and a second collar each flexibly connected to a rigid shaft.
  • the rigid shaft has a dimension L.
  • the first collar is flexibly connected at a first connection point "r" to the centrifuge rotor while the second collar is flexibly connected to the rotor drive member at a second connection point "d".
  • One of the flexible joints is thus disposed a predetermined distance A from the center of gravity of the rotor.
  • the flexible connections of the coupling exhibit predetermined torsional stiffness K d and K at their respective points of connection to the drive or the rotor.
  • the distance A is defined by the relationship:
  • FIG. 1 Shown in Figure 1 is a side elevational view entirely in section of a centrifuge rotor 10 in having a suspension system generally indicated by reference character 12 embodying the teachings of this invention. Since the suspension system 12 may be used with any well-known rotor configuration, the rotor 10 is illustrated only fragmentally. The center of gravity of the rotor is diagrammatically indicated by the character CG.
  • the rotor 10 has a central bore 14 with a suitable top cap 16 secured thereover as by threaded bolts 18. The central projection of the top cap 16 is sized to receive a central aperture of a rotor cover knob 20.
  • a generally disc-like rotor cover 22 is secured about the lower periphery of the knob 20 and held in position at that point by any suitable lock ring 24 as well understood by those skilled in the art.
  • the rotor 10 may be further provided with a windshield 26.
  • the windshield 26 is fragmentally indicated in the drawings and is conveniently secured to the rotor 10 in a manner to be discussed herein.
  • Motive force for the rotor is derived from a rotor drive arrangement 30 which includes a drive spindle 32 projecting upwardly into the central bore 14.
  • the upper end of the drive spindle 32 is provided with a threaded recess 34 for a purpose described herein.
  • the suspension system 12 in accordance with the present invention includes a substantially annular coupling member generally indicated by the reference character 40.
  • the coupling member includes first and second collar portions 42A and 42B, respectively.
  • the collars are flexibly connected through suitable flexible links 44A and 44B to each end of a substantially rigid shaft portion 46.
  • the shaft 46 has a length L while the center of gravity CG of the rotor 10 lies a distance A from one of the flexible links 44.
  • the flexible links 44A and 44B have torsional stiffnesses K r and K d respectively associated therewith.
  • the collars, flexible links, and rigid shaft are fabricated as a unitary member such as that provided by Heli-cal TM rotating shaft flexible couplings such as those sold by Heli-cal Products Company, Inc. Although such flexible couplings are preferred, any other flexible shaft coupling may be utilized.
  • the collar 42B is secured to a drive adapter 48 by a threaded bolt 50.
  • the drive adapter 48 is itself secured at the upper end of the drive spindle 32 by a capped bolt 52 which is received within the threaded recess 34 of the spindle 32.
  • the collar 42A is connected to a ring 56 by a threaded bolt 58.
  • the ring 56 is itself secured to the rotor by a threaded bolt 60.
  • the bolt 60 extends through the outward portion of the ring 56 and serves to secure not only the ring 56 but also the central portion of the windshield 26 to the under surface of the rotor 10.
  • connection point "r” is that flexible connection point adjacent the connection of the coupling 40 to the rotor 10 as defined by the flexible link 44A between the rigid shaft 46 and the collar 42A.
  • connection point "d” is defined at the flexible connection point adjacent to the connection of the coupling 40 to the drive spindle 32 defined by the flexible link 44B which extends between the rigid shaft 46 and the collar 42B.
  • the rotor's critical speed is that rotational speed at which two events simultaneously occur. These events are, firstly, the parallel alignment of the principal axis of the rotor (an axis extending through the rotor center of gravity CG) and the spin axis of the rotor (that is, an axis through the geometric center of the rotor). Secondly, the rotor's center of gravity CG must lie on the spin axis.
  • the suspension system 12 in accordance with the present invention isolates and makes independent the satisfaction of the above two conditions imposed on a rotor enabling it to reach its critical speed.
  • the suspension system 12 acts generally as a kinematic equivalent of an infinite pendulum. As seen in the force diagram of Figure 2, in order that the above two conditions be independently achieved, the angle d must at all times be made to equal the angle r .
  • the distance A is defined by the following relationship:

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  • Centrifugal Separators (AREA)
EP84111692A 1983-10-05 1984-09-29 Dispositif de suspension pour rotor de centrifuge Withdrawn EP0136686A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US53903683A 1983-10-05 1983-10-05
US06/539,364 US4511350A (en) 1983-10-06 1983-10-06 Suspension system for a centrifuge rotor
US539036 1995-10-04
US539364 2000-03-31

Publications (2)

Publication Number Publication Date
EP0136686A2 true EP0136686A2 (fr) 1985-04-10
EP0136686A3 EP0136686A3 (fr) 1986-12-10

Family

ID=27066000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111692A Withdrawn EP0136686A3 (fr) 1983-10-05 1984-09-29 Dispositif de suspension pour rotor de centrifuge

Country Status (3)

Country Link
EP (1) EP0136686A3 (fr)
DK (1) DK476784A (fr)
GR (1) GR80543B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7487760B2 (en) 2006-07-04 2009-02-10 Honda Motor Co., Ltd. Fuel supply apparatus for internal combustion engine
US7659228B2 (en) 1995-12-27 2010-02-09 Bayer Aktiengesellschaft Synergistic insecticide mixtures

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE183971C (fr) *
DE583250C (de) * 1929-05-15 1933-08-30 Aeg Befestigung von Spinntoepfen, Zentrifugentrommeln oder aehnlichen schnellaufenden Maschinenteilen
DE1106256B (de) * 1955-09-26 1961-05-04 Clemens A Voigt Zentrifuge mit vertikaler Trommelwelle
US4096711A (en) * 1976-12-13 1978-06-27 Caterpillar Tractor Co. Dual flex plate drive
US4203305A (en) * 1974-03-25 1980-05-20 Williams Richard H Flexible coupling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE183971C (fr) *
DE583250C (de) * 1929-05-15 1933-08-30 Aeg Befestigung von Spinntoepfen, Zentrifugentrommeln oder aehnlichen schnellaufenden Maschinenteilen
DE1106256B (de) * 1955-09-26 1961-05-04 Clemens A Voigt Zentrifuge mit vertikaler Trommelwelle
US4203305A (en) * 1974-03-25 1980-05-20 Williams Richard H Flexible coupling
US4096711A (en) * 1976-12-13 1978-06-27 Caterpillar Tractor Co. Dual flex plate drive

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7659228B2 (en) 1995-12-27 2010-02-09 Bayer Aktiengesellschaft Synergistic insecticide mixtures
US7487760B2 (en) 2006-07-04 2009-02-10 Honda Motor Co., Ltd. Fuel supply apparatus for internal combustion engine

Also Published As

Publication number Publication date
DK476784D0 (da) 1984-10-04
EP0136686A3 (fr) 1986-12-10
GR80543B (en) 1985-02-05
DK476784A (da) 1985-04-06

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Inventor name: ROMANAUSKAS, WILLIAM ANDREW