US3578786A - Discharge device for the bottom fraction at a vortex-type separator - Google Patents

Discharge device for the bottom fraction at a vortex-type separator Download PDF

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Publication number
US3578786A
US3578786A US838891A US3578786DA US3578786A US 3578786 A US3578786 A US 3578786A US 838891 A US838891 A US 838891A US 3578786D A US3578786D A US 3578786DA US 3578786 A US3578786 A US 3578786A
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vortex chamber
vortex
flow
outlet port
chamber
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Expired - Lifetime
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US838891A
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English (en)
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Ake Karl Gustaf Cras
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed

Definitions

  • a device for discharging the heavy bottom or reject fraction from a vortex-type separator and the device comprises a cylindrical vortex chamber which is connected to a bottom fraction outlet of the separator so as to receive the reject fraction therefrom in a manner producing a vortex flow in the vortex chamber.
  • the vortex chamber is provided with an outlet port for the reject fraction and a flowdeflecting member is disposed within the vortex chamber for deflecting the vortex flow away from the circumferential wall of the vortex chamber at the location of the outlet port.
  • the flow-deflecting member has an adjustable position in the vortex chamber so that the degree of deflection of the vortex flow from the location of the outlet port is determined by the position of the flow-deflecting member.
  • the invention relates to a device for discharging the heavy bottom or reject fraction from a vortex type separator used for the separation of a solid material suspended in a liquid, in particular a vortex-type separator for separating a reject fraction with a comparatively high density from a cellulose fibre slurry.
  • Separators of this vortex type are generally provided with a discharge chamber for the heavy reject fraction, which is connected to a bottom outlet opening in a conical part of the separator.
  • the discharge chamber for the reject fraction is generally designed as a vortex or whirl chamber, which is provided with an outlet port for the reject fraction and in which the reject fraction forms a vortex flow with a comparatively high flow velocity.
  • the control of the amount of liquid containing the reject fraction and flowing through the bottom outlet of the separator constitutes a major problem.
  • the amount of liquid containing the reject fraction being discharged through the bottom outlet of the separator must be controlable very accurately within a wide range, as a too-large liquid flow through the bottom outlet of the separator causes loss of useful product, whereas on the other hand a too-small liquid flow through the bottom outlet of the separator causes the reject fraction to partially remain in the separator and be withdrawn therefrom together with the useful product, which will give an unsatisfactory separation.
  • An object of the invention is therefore to provide an improved discharge device for the discharging of a heavy reject fraction from a vortex-type separator, which discharge device makes it possible to control the amount of liquid containing the reject fraction being discharged from the separator accurately within a wide range and down to very small liquid flows without any risk for clogging of the outlet port or the discharge pipe connected thereto with the solid material in the reject fraction.
  • the device according to the invention is of a type including a substantially cylindrical vortex or swirl chamber, which is connected to the separator so as to receive the heavy bottom fraction therefrom in a manner producing a rapid vortex flow in the vortex chamber and which is provided with an outlet port located in or close to the circumferential cylindrical wall of the vortex chamber.
  • This discharge device is characterized by a flow-deflecting member disposed within the cylindrical vortex chamber so as to deflect the vortex flow away from the cylindrical circumferential wall of the vortex chamber at the location of the outlet port, said flow-deflecting member having an adjustable position in the vortex chamber and the extent of the deflection of the vortex flow from the location of the outlet port being determined by the actual position of the flow-deflecting member. The more the vortex flow in the vortex chamber is deflected from the location of the outlet port the smaller the fluid pressure at the outlet port and thus the amount of fluid being discharged therethrough becomes.
  • FIG. 1 isan axial section through a first embodiment of the invention taken along the line 1-1 in FIG. 2;
  • FIG. 2 is a radial section through the vortex chamber shown in FIG. 1 taken along the line ll-ll in FIG. 1;
  • FIG. 3 shows the adjustable vortex deflecting member in the vortex chamber shown in FIGS. 1 and 2 as seen in the direction of the arrow III in FIG. 2;
  • FIG. 4 shows schematically in top view a vortex chamber having a vortex deflecting member of another design
  • FIG. 5 is an axial section through the vortex chamber of FIG. 4 taken along the line V-V in FIG. 4;
  • FIG. 6 shows in the same manner as FIG. 4 a vortex chamber provided with still another type of a vortex deflecting member
  • FIG. 7 is an axial section through the vortex chamber of FIG. 6 taken along the line VII-VII in FIG. 6;
  • FIG. 8 shows in the same way as FIGS. 4 and 6a vortex chamber provided with still another type of an adjustable member for deflecting the vortex flow from the outlet port of the vortex chamber.
  • FIGS. 1 to 3 The embodiment of the invention illustrated in FIGS. 1 to 3 includes a vortex chamber 1 constituted by a cylindrical bore in a vortex chamber body 2, which in the illustrated embodiment of the invention is arranged underneath the bottom outlet of the vortex-type separator 3.
  • the vortex chamber 1 has an outlet port 4 located in the cylindrical circumferential wall of the chamber.
  • a discharge pipe 5 is connected to this outlet port.
  • the bottom fraction containing the reject is discharged through the bottom outlet of the separator to the vortex chamber 1, in which the fluid containing the reject fraction forms a rapid vortex flow in the direction indicated by an arrow 6 in FIG. 2.
  • the fluid containing the reject fraction leaves the vortex chamber 1 through the outlet port 4 and the discharge pipe 5.
  • this adjustable flow-guiding member consists of a body 7 forming a bottom in the active portion of the vortex chamber 1. This body 7 is rotatable in the vortex chamber body 2 by means of a pivot shaft 8 and a handle 9 so that the body 7 can be rotated relative to the vortex chamber 1 about the axis of the chamber.
  • the upper side of the body 7 facing the active portion of the vortex chamber 1 has a first semicircular surface 10 which is perpendicular to the axis of the vortex chamber 1 and a second semicircular surface 11 which is inclined relative to the axis of the chamber 1. These two semicircular surfaces 10 and 11 are joined by a triangular surface 12 which is parallel the axis of the vortex chamber 1 and extends diametrically through the vortex chamber. Normally the rotatable body 7 is given such a position in the vortex chamber 7 that the highest portion of the triangular surface 12 is located upstream of the outlet port 4 as seen in the direction 6 of the vortex flow.
  • the outlet port 4 from the vortex chamber 1 is located in the bottom 14 of the vortex chamber immediately close to the circumferential cylindrical wall of the chamber.
  • the fluid vortex in the chamber 1, having the direction indicated by the arrow 6, can in this embodiment of the invention be more or less deflected from the outlet port 4 by the aid of a body 13.
  • This body 13 extends along the circumferential wall of the vortex chamber 1 for about threefourths of the complete circumference and has a uniform radial breadth over its entire length.
  • the helical upper surface 15 and the cylindrical inner surface 18 of the body 13 will deflect the fluid vortex from the bottom and the cylindrical circumferential wall of the vortex chamber 1 at the location of the outlet port 4. The closer to the outlet port 4 the higher end of the body 13 is located the more pronounced this deflection will be and thus the smaller the amount of fluid being discharged through the outlet port 4.
  • the outlet port 4 could just as well be located in the circumferential wall of the vortex chamber in the same way as in the embodiment of the invention illustrated in FIGS. 1 to 3.
  • the body 13 can be rotated so as to cover the outlet port 4 partially and restrict the effective flow area thereof.
  • FIGS. 6 and 7 The embodiment of the invention illustrated in FIGS. 6 and 7 is distinguished from the embodiment illustrated in FIGS. 4 and 5 primarily in that the body 19 for deflecting the fluid vortex 6 from the outlet port 4 of the vortex chamber is shaped in a different way. ln this embodiment of the invention this flowdeflecting body 19 has a uniform axial height substantially corresponding to the axial height of the vortex chamber 1 but instead a radial breadth which increases continuously as seen in the flow direction 6 of the fluid vortex.
  • the body 19 is attached to a thin disc or plate 20 forming the bottom in the vortex chamber 1. This disc 20 is rotatable in the vortex chamber body by means of a pivot pin 21, so that the body 19 can be rotated relative to the vortex chamber 1 about its axis.
  • the spiral-curved inner surface 22 of the body 19 will deflect the fluid vortex in the vortex chamber 1 from the circumferential cylindrical wall of the chamber at the location of the outlet port 4 and that this deflection will become the more pronounced the closer to the outlet port 4 the broader end of the body 19 is located.
  • the body 19 can also be rotated so far that it covers the outlet port 4 partially.
  • the fluid vortex 6 in the vortex chamber 1 is deflected from the outlet port 4 by means of a plate spring 23 mounted in the vortex chamber 1.
  • This plate spring has a breadth in the axial direction of the vortex chamber substantially corresponding to the axial height of the chamber and has its one end 23 attached to the circumferential wall of the chamber so as to extend from this end in the flow direction 6 of the fluid vortex to a point close to the outlet port 4-.
  • the end 23 of the plate spring 23 closest to the outlet port 4 can be positioned at a variable radial distance from the circumferential wall of the vortex chamber by means of a screw 24 or a similar member threaded through the circumferential wall of the vortex chamber.
  • a device for discharging a heavy bottom fraction from a vortex type separator comprising a substantially cylindrical vortex chamber connected to the separator to receive said heavy bottom fraction therefrom in a manner producing a fluid vortex in the vortex chamber, said vortex chamber having a cylindrical circumferential wall and being provided with a stationary outlet port located at the cylindrical circumferential wall of the vortex chamber, a flow-guiding member disposed in an adjustable position within said vortex chamber, said flow-guiding member having a flow-deflecting surface with an upstream end and a downstream end relative to the vortex flow and extending between said upstream end and said downstream end obliquely relative to the predominating flow direction of the vortex flow, the downstream end of the flowdeflecting surface being located in the vicinity of and upstream of said outlet port such that the flow-deflecting surface will deflect at its upstream end the vortex away from the cylindrical circumferential wall of the vortex chamber at the location of said outlet port, and means for varying the position of said flow-guiding member and thereby the flow
  • said adjustable flow-deflecting member includes a body forming the bottom of said vortex chamber, said body being rotatable about the axis of symmetry of the'vortex chamber and having an upper side facing the vortex chamber including said flow-deflecting surface having a first, substantially semicircular surface perpendicular to the axis of the vortex chamber, a second substantially semicircular surface inclined relative to the axis of the vortex chamber and a triangular surface joining said first tinuously from the bottom of the vortex chamber in the direction of the vortex flow, said body being rotatable relative to the vortex chamber about the axis of'the chamber.
  • said adjustable flow-deflecting member includes a body extending close to the circumferential wall of the vortex chamber for a portion only of the complete circumference and having a substantially constant axial height substantially corresponding to the axial height of the vortex chamber and a radial breadth which increases continuously in the direction of the vortex flow, said body being rotatable relative to the vortex chamber about the axis of the chamber.
  • said adjustable flow-deflecting member includes a plate spring having a breadth substantially corresponding to the axial height of the vortex chamber and a length corresponding to a portion only of the circumferential length of the vortex chamber, said plate spring having one end attached to the circumferential wall of the vortex chamber and extending from said one end in the direction of the vortex flow so as to have an opposite end located upstream of the outlet port of the vortex chamber,
  • said means for varying the position of the flow-deflecting member comprising means for varying the position of said opposite end of said plate spring in a radial direction relative to the circumferential wall of the vortex chamber.

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  • Cyclones (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US838891A 1968-07-09 1969-07-03 Discharge device for the bottom fraction at a vortex-type separator Expired - Lifetime US3578786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9460/68A SE324144B (xx) 1968-07-09 1968-07-09

Publications (1)

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US3578786A true US3578786A (en) 1971-05-18

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US838891A Expired - Lifetime US3578786A (en) 1968-07-09 1969-07-03 Discharge device for the bottom fraction at a vortex-type separator

Country Status (6)

Country Link
US (1) US3578786A (xx)
DE (1) DE1934878A1 (xx)
FI (1) FI44520B (xx)
FR (1) FR2012592A1 (xx)
GB (1) GB1252823A (xx)
SE (1) SE324144B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4537314A (en) * 1982-09-02 1985-08-27 Skardal Karl A Vortex cleaner
WO1996006684A1 (en) * 1994-09-01 1996-03-07 Kvaerner Pulping Ab Separator for removing impurities from a fluid
AU673633B2 (en) * 1994-01-10 1996-11-14 Otis Elevator Company Elevator swing car service of interrise hall calls
EP1413359A1 (de) * 2002-10-22 2004-04-28 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Abscheiden von Schwerteilen aus einer Faserstoffsuspension

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277926A (en) * 1964-08-18 1966-10-11 Celleco Ab Vortex type separator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277926A (en) * 1964-08-18 1966-10-11 Celleco Ab Vortex type separator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4537314A (en) * 1982-09-02 1985-08-27 Skardal Karl A Vortex cleaner
AU673633B2 (en) * 1994-01-10 1996-11-14 Otis Elevator Company Elevator swing car service of interrise hall calls
WO1996006684A1 (en) * 1994-09-01 1996-03-07 Kvaerner Pulping Ab Separator for removing impurities from a fluid
EP1413359A1 (de) * 2002-10-22 2004-04-28 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Abscheiden von Schwerteilen aus einer Faserstoffsuspension

Also Published As

Publication number Publication date
GB1252823A (xx) 1971-11-10
FR2012592A1 (xx) 1970-03-20
SE324144B (xx) 1970-05-25
DE1934878A1 (de) 1970-12-23
FI44520B (xx) 1971-08-02

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