WO1988002663A1 - Separateur centrifuge - Google Patents

Separateur centrifuge Download PDF

Info

Publication number
WO1988002663A1
WO1988002663A1 PCT/SE1987/000470 SE8700470W WO8802663A1 WO 1988002663 A1 WO1988002663 A1 WO 1988002663A1 SE 8700470 W SE8700470 W SE 8700470W WO 8802663 A1 WO8802663 A1 WO 8802663A1
Authority
WO
WIPO (PCT)
Prior art keywords
driving shaft
rotor
opening
tube
sealing
Prior art date
Application number
PCT/SE1987/000470
Other languages
English (en)
Inventor
Karl Laigar
Original Assignee
Alfa-Laval Separation 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 Separation Ab filed Critical Alfa-Laval Separation Ab
Publication of WO1988002663A1 publication Critical patent/WO1988002663A1/fr

Links

Classifications

    • 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
    • B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
    • B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
    • 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 concerns a centrifugal separator of the kind that has a rotor, forming a separation chamber, and a hollow driving shaft supporting the rotor, said driving shaft enclosing a first channel, which opens into the rotor and is arranged to supply a liquid mixture to be separated in diffe ⁇ rent components in the separation chamber, and a second channel opening into the rotor separately from the opening of the first channel and arranged for the supply of another liquid to the rotor.
  • the following arrangement is used for the supply of the other liquid.
  • a tube extending coaxially therewith, leaving a very narrow gap between itself and the circumferential wall of the shaft.
  • the interior of the central tube communi- cates with an inlet for said liquid mixture, while the inter ⁇ space between the tube and the driving shaft communicates with an inlet for the other liquid.
  • Sealing means coaxial with the tube and the driving shaft are arranged at both of said inlets.
  • the arrangement thus used in practice means that a relatively large part of the available cross sectional area of the driving shaft cavity has to be used for the central tube, since this cannot be made too thin. Further, the arrangement means a complication in connection with assembling of the centrifuge rotor and each time it should be disassembled at service operations, since the central tube then has to be removed from the said sealing means and is not quite easy to get into place again.
  • ⁇ he object of the present invention is to provide an improved solution of the problem discussed above, so that a larger part of the interior of the driving shaft can be used for the supply of liquid mixture to the rotor and so that the complications in connection with service operations are reduced.
  • this object can be achieved in a centrifugal separator of the kind initially defined by means of 1) a tube extending within said first channel and which has a through passage forming said second channel for the other liquid, the tube at its end remote from the rotor being so supported by and sealingly connected to the driving shaft around a through opening in the circumferential wall thereof that the opening communicates with the passage within the tube, 2) a sealing device comprising two sealing members, which are mounted around the driving shaft and arranged to seal against its out ⁇ side axially on both sides of said opening, and a sealing housing, which together with the sealing members forms an annular chamber around the driving shaft in communication with the opening, and 3) means for the supply of said other liquid to the said chamber.
  • a tube having very thin walls can be mounted within the driving shaft, whereby a largest possible part of the driving shaft interior can be used for the supply of liquid mixture to the rotor.
  • the tube is supported by the driving shaft and does not have to be removed upon disassembling of the centrifuge rotor, the tube does not have to be dimensioned to resist ungentle mechanical treatment. Furthermore, all problems concerning mounting of it in connection with repeated service operations are avoided.
  • a fundamental difference between the invention and the previously known technique described above is that the separate tube within the driving shaft is used according to the invention for the supply of said other liquid but, according to previously known technique, is used for the supply of liquid mixture to be separated in components in the separation chamber of the rotor.
  • sealing device comprises two mechanical seals, each of which has a sealing ring connected to the driving shaft and arranged to abut axially against a sealing ring, which is connected to the sealing housing.
  • the sealing between the tube and the driving shaft can be arranged in many different manners.
  • the tube is permanently joined to the driving shaft around the opening in the same, for instance by soldering or by welding.
  • the former preferably abuts the inside of the latter along the main part of its length and is inserted into the opening in the driving shaft with an end portion forming an angle with the driving shaft.
  • a centrifuge rotor 1 in which a separation chamber 2 is confined.
  • a stack of conical separation discs 4 rests on a distributor bottom 3 in the separation chamber 2.
  • the rotor is supported by a hollow driving shaft 5, which has a through-passing central channel 6.
  • the channel 6 is in connection to the separation chamber 2 via passages 7 in the rotor and holes 8 in the distributor bottom 3.
  • the driving shaft is supported by a frame 9 via an upper bearing device 10 and a lower bearing device 11. Between the bearing devices 10 and 11 there is means (not shown) for the driving of the driving shaft 5 and consequently the rotor 1.
  • a small tube 12 extends with a through passage 13.
  • the tube 12 has bent end portions, which extends into two through-passing openings 14, 15, respectively, in the circumferential wall of the driving shaft 5.
  • the end portions of the tube 12 are tightly connected to the driving shaft 5 around said openings 14 and 15 e.g.by welding.
  • the main part of the tube 22 abuts against the inside of the driving shaft 5.
  • the opening 14 and consequently the passage 13 in the tube 12 is in connection with the separation chamber 2 via the channel 16 and the space 17.
  • the frame 9 supports a sealing device 18, which is arranged for separate supply of different liquids to the channel 6 in the driving shaft 5 and the passage 13 in the tube 12, respectively.
  • the sealing device 18 is connected to a pump 20 via a conduit 19 for the supply of a liquid mixture, which is to be divided up into two components in the separation chamber 2, and connected to a second pump 22 via a conduit 21 for the supply of another liquid to the separation chamber via the tube 12.
  • the sealing device 18, which is shown enlarged in fig 2, comprises a housing 23, which surrounds the lower end portion of the driving shaft 5 and is connected to the frame 9. Inside the housing 23 the driving shaft 5 is surrounded axially on each side of the above mentioned opening 15 by two mechanical sealings.
  • the one (upper) mechanical sealing has a rotatable sealing ring 24 connected to the driving shaft and a stationary sealing ring 25 connected to the frame 9.
  • the sealing rings 24 and 25 sealingly abut axially against each other.
  • the other (lower) mechanical sealing has a rotatable sealing ring 26 connected to the driving shaft and a stationary sealing ring 27 connected to the housing 23.
  • the sealing rings 26 and 27 sealingly abut axially against each other.
  • a helically coiled spring 28 is arranged between the two rotatable sealing rings 24, 26 and presses these from each other into abutment against the stationary sealing rings 25 and 27, respectively.
  • the rotatable sealing rings 24 and 26 consequently are axially movable relative to the driving shaft 5 sealingly abutting against the outside of the same.
  • annular chamber 29 which communicates with the previously mentioned opening 15 in the driving shaft 5.
  • the conduit 21 opens in the chamber 29.
  • the housing 23 has a central through-passing bore hole 30, to which the conduit 19 is connected.
  • the bore hole 30 communicates with the channel 6 in the driving shaft 5.
  • the lower mechanical sealing 26, 27 around the driving shaft 5 prevents communication between the annular chamber 29 and the bore hole 30 in the housing 23.
  • the liquid, which is supplied to the chamber 29 via the conduit 21 serves as sealing liquid for the two mechanical sealings in the housing 23.
  • a draining channel 31 is formed in the frame 9 to lead away liquid, which possibly passes the upper mechanical sealing 24, 25.
  • the pump 22 In connection with starting of the centrifugal rotor 1 the pump 22 is activated, so that liquid is supplied to the chamber 29 in the housing 23. Thereby, the functional wetting of the mechanical sealings 24, 25 and 26, 27 is ensured.
  • the pump 20 When the wanted rotational speed has been achieved for the centrifugal rotor, the pump 20 is activated, so that a liquid mixture is supplied to the separation chamber of the rotor via the conduit 19, the bore hole 30, the channel 6, the passages 7 and the holes 8.
  • the separation chamber 2 there is formed an interface at the radial level of the holes 8 between two separated components of the supplied liquid mixture.
  • the other liquid which is supplied to the separation chamber 2, by means of the pump 22 via the conduit 21, the chamber 23, the opening 15, the passage 13, the opening 14, the channel 16 and the chamber 17, will consequently be mixed up with the heavier one of the two separated components in the separation chamber 2. In that way the viscosity of this component can be lowered, which thereby easier than otherwise ca be discharged out of the rotor via an outlet, which is not shown on the drawing.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Un certain type de séparateur centrifuge comprend un rotor (1) pourvu d'un arbre d'entraînement creux (5) permettant d'alimenter le rotor à l'aide d'un mélange liquide dont on désire séparer les composants. Un tube fin (12) pénètre dans la cavité (6) de l'arbre d'entraînement (5) pour permettre d'alimenter le rotor (1) à l'aide d'un autre liquide. Deux bagues d'étanchéité (24, 25; 26, 27) sont disposées autour de l'arbre d'entraînement (5), de chaque côté d'une ouverture radiale (15) pratiquée dans celui-ci. L'ouverture (15) communique avec le passage (13) dans le tube (12).
PCT/SE1987/000470 1986-10-17 1987-10-15 Separateur centrifuge WO1988002663A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8604420-3 1986-10-17
SE8604420A SE454571B (sv) 1986-10-17 1986-10-17 Centrifugalseparator med en andra kanal, for tillforsel av ytterligare vetska, anordnad inuti den ihaliga drivaxeln

Publications (1)

Publication Number Publication Date
WO1988002663A1 true WO1988002663A1 (fr) 1988-04-21

Family

ID=20365966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000470 WO1988002663A1 (fr) 1986-10-17 1987-10-15 Separateur centrifuge

Country Status (2)

Country Link
SE (1) SE454571B (fr)
WO (1) WO1988002663A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526316A1 (fr) * 2003-10-24 2005-04-27 GAT Gesellschaft für Antriebstechnik mbH Passage radial tournant
CN110355003A (zh) * 2019-07-26 2019-10-22 南京中船绿洲机器有限公司 一种碟式分离机转鼓内水封和冲洗水加入装置
CN113996449A (zh) * 2021-10-21 2022-02-01 山东畜牧兽医职业学院 一种孕马血清提纯用离心分离装置
EP4011498A1 (fr) * 2020-12-14 2022-06-15 Alfa Laval Corporate AB Collier de protection et séparateur centrifuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700558A (en) * 1952-09-18 1955-01-25 Johnson Corp Load compensator for sealing rings and the like
GB802000A (en) * 1956-02-08 1958-09-24 Laval Separator Co De Improvements in or relating to centrifugal separators
SE442236B (sv) * 1978-05-08 1985-12-09 Aeroquip Ag Rotationskoppling
EP0203675A1 (fr) * 1985-05-31 1986-12-03 The Johnson Corporation Joint rotatif avec joints d'étanchéité équilibrés

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700558A (en) * 1952-09-18 1955-01-25 Johnson Corp Load compensator for sealing rings and the like
GB802000A (en) * 1956-02-08 1958-09-24 Laval Separator Co De Improvements in or relating to centrifugal separators
SE442236B (sv) * 1978-05-08 1985-12-09 Aeroquip Ag Rotationskoppling
EP0203675A1 (fr) * 1985-05-31 1986-12-03 The Johnson Corporation Joint rotatif avec joints d'étanchéité équilibrés

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526316A1 (fr) * 2003-10-24 2005-04-27 GAT Gesellschaft für Antriebstechnik mbH Passage radial tournant
CN110355003A (zh) * 2019-07-26 2019-10-22 南京中船绿洲机器有限公司 一种碟式分离机转鼓内水封和冲洗水加入装置
EP4011498A1 (fr) * 2020-12-14 2022-06-15 Alfa Laval Corporate AB Collier de protection et séparateur centrifuge
WO2022128348A1 (fr) * 2020-12-14 2022-06-23 Alfa Laval Corporate Ab Collier de protection et séparateur centrifuge
CN113996449A (zh) * 2021-10-21 2022-02-01 山东畜牧兽医职业学院 一种孕马血清提纯用离心分离装置

Also Published As

Publication number Publication date
SE454571B (sv) 1988-05-16
SE8604420D0 (sv) 1986-10-17

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