EP3338897B1 - Zentrifugalabscheider - Google Patents

Zentrifugalabscheider Download PDF

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Publication number
EP3338897B1
EP3338897B1 EP16205429.0A EP16205429A EP3338897B1 EP 3338897 B1 EP3338897 B1 EP 3338897B1 EP 16205429 A EP16205429 A EP 16205429A EP 3338897 B1 EP3338897 B1 EP 3338897B1
Authority
EP
European Patent Office
Prior art keywords
ring
elastic support
frame member
support member
centrifugal separator
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.)
Active
Application number
EP16205429.0A
Other languages
English (en)
French (fr)
Other versions
EP3338897A1 (de
Inventor
Per Karlsson
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 Corporate AB
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Alfa Laval Corporate 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 Corporate AB filed Critical Alfa Laval Corporate AB
Priority to EP16205429.0A priority Critical patent/EP3338897B1/de
Priority to CN201780078726.9A priority patent/CN110062661B/zh
Priority to PCT/EP2017/083363 priority patent/WO2018114833A1/en
Publication of EP3338897A1 publication Critical patent/EP3338897A1/de
Application granted granted Critical
Publication of EP3338897B1 publication Critical patent/EP3338897B1/de
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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

  • the present invention refers to a centrifugal separator comprising, a centrifugal rotor, a rotatable spindle, rotatable around an axis, to which said centrifugal rotor is fixedly attached, a stationary frame member, at least one bearing journaling said spindle in said stationary frame member, a support device which comprises a bearing holder, directly supporting said bearing.
  • Conventional spindle support devices for centrifugal separators are mainly of two different kinds, namely support devices, in which helical springs apply a force to oscillation-dampening friction buffers, and support devices, which are constructed by resilient rubber elements producing a dampening effect by inner friction.
  • Such known support devices comprise many components, which make them complicated and expensive.
  • the dampening properties of the friction buffers as well as of the rubber elements are difficult to calculate.
  • coatings (coke) are formed, which change the dampening properties and result in a great risk for jamming.
  • wearing particles are formed, which reduce the lifetime of the support device.
  • the conduct of heat is insufficient in these known support devices, since rubber has a low heat conductivity and the friction surfaces of the friction buffers deteriorate the conduct of heat.
  • WO8001248 discloses an example of such support device for centrifugal separator.
  • WO89/10794 discloses an example of such a known support device for a centrifugal separator having a centrifuge rotor which is rotatable in a frame member by means of a bearing member.
  • the support device comprises a number of support members extending radially outwardly from the bearing member and which each encloses a helical spring element. Consequently, these support members are arranged to permit relative radial movements between the centrifuge rotor and the frame member by being compressed in a respective space of the frame member.
  • the helical spring elements thereby act on a piston movable in the space and abutting the outer wall of a bearing housing.
  • the spring constant of the helical spring elements By means of the spring constant of the helical spring elements, a certain stiffness of the known support device is obtained, which together with the resiliency of, for instance, the rotor spindle, determines the critical number of revolutions of the centrifuge rotor.
  • the helical springs of this type In centrifugal separators, the helical springs of this type have to be dimensioned to the frequently very high stresses and fatigue risks to which they are subjected.
  • WO99/46052 discloses a known support device similar to the one described in WO89/10794 .
  • the helical spring elements are embedded in resilient rubber in several different embodiments.
  • the dampening of the radial movements is obtained by means of the friction which arises between the piston and its contact surfaces, in particular the outer wall of the bearing housing.
  • the friction which arises results in addition to the dampening of the relative movements, also in the generation of heat.
  • Such a heat generation is not desirable and forces the bearing to operate at a relatively high temperature, which reduces the lifetime of the bearing.
  • Another problem is that the arrangement of moving pistons is rather space requiring. Such a space may be difficult to provide for the support device in a centrifugal separator, in particular outside the so-called neck bearing.
  • these known support devices have a rather complicated construction, which of course makes the manufacture and the mounting labour demanding and expensive. In addition, it is difficult to conduct heat away from the bearing member.
  • the object of the present invention is to provide a centrifugal separator including a support device, which from a construction point of view is less complicated than the support devices known up to now and by which the problems mentioned above may be remedied. Further aspects of the invention are apparent from the dependent claims and the description.
  • a support device designed in this manner is space saving. Furthermore the elastic characteristics is evenly distributed around the circumference of the spindle
  • Said elastic support member may have a ring-formed central part which ring-formed surface is free from contact with said bearing holder and said stationary frame member.
  • Said inner ring-formed part of said elastic support member may be fitted in a ring-formed radially inner space in said bearing holder, and said outer ring-formed part of said elastic support member is fitted in a ring-formed outer space in said stationary frame member.
  • the inner ring-formed part of said elastic support member is fitted with a ring-formed inner plate on an axially upper and a lower ring-formed surface respectively of said inner ring-formed part
  • the outer ring-formed part of said elastic support member is fitted with a ring-formed plate on an axially upper and a lower ring-formed surface respectively of the outer part of said elastic support member.
  • Said ring-formed inner plates and said ring-formed outer plates may be made of a metallic material.
  • Said ring-formed inner plates and said ring-formed outer plates may be vulcanized onto said elastic support member.
  • Said ring-formed inner plates and said ring-formed outer plates may be glued onto said elastic support member.
  • Said elastic support member may be made of rubber.
  • Said stationary frame member may comprise a ring-formed outer cover attached by screws to said frame member, said ring-formed outer cover together with said frame member defining said ring-formed outer space.
  • Said bearing holder may comprise a ring-formed inner cover attached by screws to said bearing holder, said ring-formed inner cover partly defining said ring-formed inner space.
  • Fig 1 discloses schematically parts of a centrifugal separator having a vertical spindle 1, which is journalled in a lower bearing 2 and an upper bearing 3.
  • the lower bearing 2 is most often arranged to absorb essentially radial forces acting on the spindle 1
  • the upper bearing 3 is most often arranged to absorb essentially radial and axial forces acting on the spindle 1.
  • the spindle 1 carries at its upper end above the upper bearing 3 a centrifuge rotor 4.
  • the spindle 1 and the centrifuge rotor 4 are rotatable about an axis x of rotation and driven in the example disclosed by a motor (not shown) via a screw gear 5, but may of course instead be belt driven or direct driven by a motor acting directly on the spindle.
  • the upper bearing 3 is supported by means of a support device 6 which comprises a bearing holder 9 directly supporting the outer bearing ring 3a and a substantially stationary frame member 7.
  • the bearing holder 9 is connected to the stationary frame member 7 by a ring-formed elastic support member 8.
  • the ring-formed elastic support member 8 has an inner ring-formed part 8a connected to said bearing holder 9 and an outer ring-formed part 8b connected to said stationary frame member 7 thereby forming an elastic connection between said bearing holder 9 and said frame member.
  • the elastic support member 8 may be made of rubber or any elastic material with suitable characteristics.
  • the stationary frame member 7 comprises a ring-formed outer cover 7a which may be a separate component attached by screws to the frame member 7, or may be a part of said frame member 7. Together they define a ring-formed radially outer space 7b open radially inwardly.
  • the bearing holder 9 comprises a ring-formed inner cover 9a which may be a separate component attached by screws to the bearing holder 9, or may be a part of said bearing holder 9. Together they define a ring-formed radially inner space 9b open radially outwardly.
  • the inner ring-formed part 8a of the elastic support member 8 is fitted in said ring-formed inner space 9b in the bearing holder 9 and the outer ring-formed part 8b of said elastic support member 8 is fitted in said outer space 7b in the frame member 7.
  • a ring-formed center part 8c of said elastic support member 8 is positioned radially between said inner space 9b and said outer space 7b forming a zone of the elastic support member 8, which ring-formed surface is free from contact with said bearing holder 9 and said stationary frame member 7.
  • the bearing holder 9 and the frame member 7 thus do not have any metallic contact with each other.
  • the support device 6 is thereby arranged to permit a limited pivoting movement of the spindle 1, and details connected thereto, such as the centrifuge rotor 4, and the upper bearing 3 in relation to the frame member 7.
  • the elastic support member 8 is, as is shown in fig.
  • the inner and outer plates 10, 11 are preferably of metal and vulcanized or glued onto the elastic support member 8 to form a complete elastic buffer.
  • the elastic support member 8 would wear a lot because of a lot of relative movement between the elastic support member 8 and the frame member 7 when the centrifuge rotor 4 creates dynamic forces to the elastic support member 8.

Landscapes

  • Centrifugal Separators (AREA)
  • Support Of The Bearing (AREA)

Claims (9)

  1. Zentrifugalabscheider, der Folgendes umfasst: einen Zentrifugalrotor (4), eine drehbare Welle (1), die um eine Achse drehbar ist, an welcher der Zentrifugalrotor (4) fest angebracht ist, ein unbewegliches Rahmenelement (7), wenigstens ein Lager (3), das die Welle (1) in dem unbeweglichen Rahmenelement (7) dreht, eine Stützeinrichtung (6), die eine Lagerhalterung (9) umfasst, die das Lager (3) unmittelbar trägt, wobei die Lagerhalterung (9) durch ein ringförmiges elastisches Stützelement (8), das einen inneren ringförmigen Teil (8a), der mit der Lagerhalterung (9) verbunden ist, und einen äußeren ringförmigen Teil (8b), der mit dem unbeweglichen Rahmenelement (7) verbunden ist, aufweist, mit dem unbeweglichen Rahmenelement (7) verbunden ist, wodurch eine elastische Verbindung zwischen der Lagerhalterung (9) und dem Rahmenelement (7) gebildet wird, dadurch gekennzeichnet, dass der innere ringförmige Teil (8a) des elastischen Stützelements (8) jeweils auf einer in Axialrichtung oberen beziehungsweise unteren ringförmigen Fläche des inneren ringförmigen Teils (8a) mit einer ringförmigen inneren Platte (10) ausgerüstet ist und der äußere ringförmige Teil (8b) des elastischen Stützelements (8) jeweils auf einer in Axialrichtung oberen beziehungsweise unteren ringförmigen Fläche des äußeren ringförmigen Teils (8b) des elastischen Stützelements (8) mit einer ringförmigen Platte (11) ausgerüstet ist.
  2. Zentrifugalabscheider nach Anspruch 1, wobei das elastische Stützelement (8) einen ringförmigen mittigen Teil (8c) aufweist, wobei die ringförmige Fläche frei von einer Berührung mit der Lagerhalterung (9) und dem unbeweglichen Rahmenelement (7) ist.
  3. Zentrifugalabscheider nach Anspruch 1 oder 2, wobei der innere ringförmige Teil (8a) des elastischen Stützelements (8) in einem ringförmigen in Radialrichtung inneren Raum (9b) in der Lagerhalterung (9) eingepasst ist und der äußere ringförmige Teil (8b) des elastischen Stützelements (8) in einem ringförmigen in Radialrichtung äußeren Raum (7b) in dem unbeweglichen Rahmenelement (7) eingepasst ist.
  4. Zentrifugalabscheider nach einem der Ansprüche 1 bis 3, wobei die ringförmigen inneren Platten (10) und die ringförmigen äußeren Platten (11) aus einem metallischen Werkstoff hergestellt sind.
  5. Zentrifugalabscheider nach einem der vorhergehenden Ansprüche, wobei die ringförmigen inneren Platten (10) und die ringförmigen äußeren Platten (11) auf das elastische Stützelement (8) vulkanisiert sind.
  6. Zentrifugalabscheider nach einem der Ansprüche 1 bis 4, wobei die ringförmigen inneren Platten (10) und die ringförmigen äußeren Platten (11) auf das elastische Stützelement (8) geklebt sind.
  7. Zentrifugalabscheider nach einem der vorhergehenden Ansprüche, wobei das elastische Stützelement (8) aus Gummi hergestellt ist.
  8. Zentrifugalabscheider nach einem der vorhergehenden Ansprüche, wobei das unbewegliche Rahmenelement (7) eine ringförmige äußere Abdeckung (7a) umfasst, die durch Schrauben an dem Rahmenelement (7) befestigt ist, wobei die ringförmige äußere Abdeckung (7a) zusammen mit dem Rahmenelement den ringförmigen äußeren Raum (7b) definiert.
  9. Zentrifugalabscheider nach einem der Ansprüche 1 bis 7, wobei die Lagerhalterung (9) eine ringförmige innere Abdeckung (9a) umfasst, die durch Schrauben an der Lagerhalterung (9) befestigt ist, wobei die ringförmige innere Abdeckung (9a) zusammen mit der Lagerhalterung (9) den ringförmigen inneren Raum (9b) definiert.
EP16205429.0A 2016-12-20 2016-12-20 Zentrifugalabscheider Active EP3338897B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP16205429.0A EP3338897B1 (de) 2016-12-20 2016-12-20 Zentrifugalabscheider
CN201780078726.9A CN110062661B (zh) 2016-12-20 2017-12-18 离心分离器
PCT/EP2017/083363 WO2018114833A1 (en) 2016-12-20 2017-12-18 Centrifugal separator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16205429.0A EP3338897B1 (de) 2016-12-20 2016-12-20 Zentrifugalabscheider

Publications (2)

Publication Number Publication Date
EP3338897A1 EP3338897A1 (de) 2018-06-27
EP3338897B1 true EP3338897B1 (de) 2019-07-24

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ID=57590354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16205429.0A Active EP3338897B1 (de) 2016-12-20 2016-12-20 Zentrifugalabscheider

Country Status (3)

Country Link
EP (1) EP3338897B1 (de)
CN (1) CN110062661B (de)
WO (1) WO2018114833A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB806821A (en) * 1956-10-29 1958-12-31 Broadbent & Sons Ltd Thomas Improvements relating to centrifugal machines
US4224165A (en) * 1978-12-14 1980-09-23 The Western States Machine Company Cyclical centrifugal machine
SE460458B (sv) 1988-05-13 1989-10-16 Alfa Laval Separation Ab Centrifugalseparator med smord daempningsanordning
SE512770C2 (sv) * 1998-02-19 2000-05-08 Alfa Laval Ab Stödanordning
SE513766C2 (sv) 1998-03-13 2000-10-30 Alfa Laval Ab Stödanordning för en king en rotationsaxel roterbar spindel som uppbär en centrifugrotor
EP2735352A1 (de) * 2012-11-23 2014-05-28 Alfa Laval Corporate AB Zentrifugalabscheider

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN110062661A (zh) 2019-07-26
EP3338897A1 (de) 2018-06-27
CN110062661B (zh) 2021-04-20
WO2018114833A1 (en) 2018-06-28

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