US3734288A - 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
US3734288A
US3734288A US00123280A US3734288DA US3734288A US 3734288 A US3734288 A US 3734288A US 00123280 A US00123280 A US 00123280A US 3734288D A US3734288D A US 3734288DA US 3734288 A US3734288 A US 3734288A
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Prior art keywords
vortex chamber
outlet
outlet port
vortex
chamber
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Expired - Lifetime
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US00123280A
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English (en)
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K Skardal
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Individual
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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
    • B04C5/16—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with variable-size outlets from the underflow ducting
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force

Definitions

  • ABSTRACT A device for discharging the heavy bottom or reject fraction from a vortex type separator.
  • the device comprises a vortex chamber disposed underneath the bottom fraction outlet of the separator with the axis of symmetry of the vortex chamber parallel to the axis of symmetry of the bottom fraction outlet.
  • the vortex chamber is provided with a stationary outlet port for the reject fraction, located in the circumferential wall of the vortex chamber or in the bottom of the vortex chamber close to the circumferential wall thereof.
  • the vortex chamber is displaceable relative to the bottom fraction outlet in a direction perpendicular to the axis of symmetry of the vortex chamber.
  • This invention relates to a device for discharging the heavy bottom or reject fraction from a vortex type separator used for the separation of solid material suspended in a liquid, in particular vortex type separators for cellulose fiber slurries, with rejection of a bottom or reject fraction having a comparatively high density.
  • Vortex type separators of this type are generally provided with a discharge chamber for the reject fraction, which is connected to a bottom outlet for the reject fraction in the conical part of the separator.
  • said discharge chamber 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 adjustable flow deflecting member in the vortex chamber is subjected to a comparatively heavy wear due to cavitation erosion.
  • a wear resistant surface layer e.g., a chromium layer
  • a chromium layer is a comparatively expensive step due to the rather complicated shape of the member.
  • the object of the present invention is therefore to provide an improved device for controlling the volume of the reject fraction being discharged from a vortex type separator, which device is of the type initially described in this specification, comprising a vortex chamber disposed underneath the bottom fraction outlet of the separator chamber and provided with an outlet port in its circumferential wall or in its bottom close to the circumferential wall, but which does not suffer from the above discussed disadvantages of previously used devices of the same type.
  • the vortex chamber has its axis of symmetry parallel to the axis of symmetry of the bottom fraction outlet from the separating chamber of the vortex separator and is displaceable relative to said bottom fraction outlet in a direction perpendicular to said axes of symmetry.
  • the vortex chamber is displaceable in a direction parallel to the diameter in the vortex chamber, at one end of which the outlet port of the vortex chamber is located.
  • the vortex chamber is cylindrical, in which case the maximum flow volume of the reject fraction being discharged through the outlet port of the vortex chamber is obtained with the vortex chamber in such a position that its axis of symmetry substantially coincides with the axis of symmetry of the bottom fraction outlet from the separating chamber.
  • the vortex chamber is conical and has its larger end facing the bottom fraction outlet from the separating chamber of the vortex separator, in which case the minimum flow volume of the reject fraction being discharged through the outlet port of the vortex chamber is obtained with the vortex chamber in such a position that its axis of symmetry substantially coincides with the axis of symmetry of the bottom fraction outlet from the separating chamber.
  • the device is of a very simple construction and very inexpensive to manufacture, as the vortex chamber has a very simple shape and does not include any adjustable or movable members.
  • the problems with cavitation within the vortex chamber are also much smaller and due to the simple form of the vortex chamber the walls of the chamber can be provided with a wear resistant surface layer at a comparatively low cost.
  • FIG. 1 shows schematically and in axial section a first embodiment of the invention having a cylindrical vortex chamber
  • FIG. 1a is a partial showing of a modified embodiment of the invention, similar to that of FIG. 1;
  • FIGS. 2 and 3 show schematically and in axial section an especially preferred embodiment of the invention having a conical vortex chamber, FIG. 2 showing the vortex chamber in a position for minimum flow volume through the outlet port of the vortex chamber, and FIG. 3 showing the vortex chamber in a position for a large flow volume through the outlet port;
  • FIG. 4 is a diagram showing the flow volume through the outlet port of the vortex chamber as a function of the displacement of the vortex chamber, on the one hand in the device illustrated in FIG. 1 and on the other hand in the device illustrated in FIGS. 2 and 3.
  • FIG. 1 shows schematically the lower portion of a vortex type separator I having a conical separating chamber 2, a circular bottom fraction outlet 3 for the reject fraction at the lower end of the separating chamber, and a bottom flange or ring 4.
  • a vortex chamber body 6 with a cylindrical vortex chamber is mounted underneath the bottom fraction outlet 3 from the separating chamber 2 in a manner known per se in the art.
  • the vortex chamber 5 has an outlet port 7 in its circumferential wall.
  • a discharge pipe 8 is connected to said outlet port 7.
  • an outlet port 7a can also be located entirely or partially in the bottom of the vortex chamber 5, in a body 6a, close to the circumferential wall of the chamber, and having a discharge pipe 8a connected to said port.
  • the respective body 6 or 6a of the vortex chamber 5 is, in accordance with the invention, displaceable in the direction indicated by an arrow 9 perpendicularly to its axis of symmetry 10 relative to the bottom fraction outlet 3 of, the separator.
  • the vortex chamber body 6, 6a is mounted on the lower side of the bottom flange 4 of the separator by means of a yoke 11 and a clamping screw 12 passing through a threaded hole in the yoke.
  • a seal ring 13 is provided for the necessary sealing between the vortex chamber body 6, 6a and the bottom flange 4.
  • an adjustment screw 15 is provided, which is screwed into a threaded bore 16 in the vortex chamber body and is rotatably mounted in a bracket arm 17 attached to the yoke 11.
  • the maximum flow volume through the outlet port is obtained when the vortex chamber 5 is positioned exactly underneath the bottom fraction outlet 3 of the separator, i.e., when the axis of symmetry 10 of the vortex chamber 5 substantially coincides with the axis of symmetry 14 of the bottom fraction outlet 3.
  • the curve A in FIG. 5 illustrates the results when testing a device of the type illustrated in FIG. 1, in which the vortex chamber 5 as well as the bottom fraction outlet 3 of the separator had a diameter of 30 mm and in which the suspension to be separated was supplied to the inlet of the separator at the upper end thereof (not shown in the drawing) under a pressure of 26 m H 0 and the useful or top fraction was withdrawn from the upper end of the separator under a pressure of 2 m H O.
  • FIGS. 1 and 1a and described in the foregoing have generally given very good results in operation and do not suffer from any of the disadvantages discussed in the foregoing that are present in the prior art devices. It has turned out, however, that in the invention it is difficult, even with a very large displacement c of the vortex chamber 5, to reach a very small liquid flow through the outlet port 7 or 7a vortex chamber. This fact is also illustrated by the curve A in FIG. 2. In this respect much better results have been obtained with the embodiment of the invention illustrated in FIGS. 2 and 3, wherefore this embodiment is considered as especially advantageous.
  • the device according to the invention illustrated in FIGS. 2 and 3 is in essential parts designed in the same manner as the devices illustrated in FIG. 1, la, wherefore corresponding parts are provided with the same reference numerals in FIGS. 2 and 3 as in FIG. 1.
  • the important difference consists therein that a vortex chamber 19, used in lieu of chamber 5, is not cylindrical but conically tapered with its smaller end facing downwards. This difference causes a very unexpected change in the mode of operation of the device in FIGS. 2 and 3 as compared with the mode of operation of the devices in FIGS. 1, 1a.
  • the curve B in FIG. 4 illustrates the relationship between the flow volume through the outlet port 7 of the vortex chamber 19 and the lateral displacement 0 between the axis of symmetry 10 of the vortex chamber and the axis of symmetry 14 of the bottom fraction outlet 3 for the device illustrated in FIGS. 2 and 3,
  • a device designed in accordance with FIGS. 2 and 3 gives a minimum liquid flow through the outlet port 7 of the vortex chamber 19, when the vortex chamber 19 is positioned directly underneath the bottom fraction outlet 3, whereas an increasing liquid flow through the outlet port 7 is obtained when the lateral displacement c of the vortex chamber 19 is increased.
  • the lateral displacement of the vortex chamber is substantially parallel to the diameter in the vortex chamber, at the one end of which the outlet port of the vortex chamber is located.
  • a lateral displacement of the vortex chamber in another direction gives a similar result, in particular for a conical vortex chamber.
  • a device for discharging a heavy bottom fraction from a vortex type separator comprising a vortex chamber disposed underneath and in flow communication with a bottom fraction outlet from the separator, with the axis of symmetry of said vortex chamber parallel to the axis of symmetry of said outlet, said vortex chamber being provided with an outlet port provided in the area of the circumferential wall of said vortex chamber, and means for displacing said vortex chamber relative to said outlet in a direction substantially perpendicular to said axis of said symmetry of the vortex chamber, whereby the flow volume of the bottom fraction being discharged through said outlet port can be varied by displacing said vortex chamber in said direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cyclones (AREA)
  • Laminated Bodies (AREA)
  • Soy Sauces And Products Related Thereto (AREA)
US00123280A 1970-03-12 1971-03-11 Discharge device for the bottom fraction at a vortex type separator Expired - Lifetime US3734288A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03314/70A SE340085B (fi) 1970-03-12 1970-03-12

Publications (1)

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US3734288A true US3734288A (en) 1973-05-22

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US00123280A Expired - Lifetime US3734288A (en) 1970-03-12 1971-03-11 Discharge device for the bottom fraction at a vortex type separator

Country Status (10)

Country Link
US (1) US3734288A (fi)
JP (1) JPS543254B1 (fi)
CA (1) CA958347A (fi)
DE (1) DE2111760A1 (fi)
FI (1) FI51515C (fi)
FR (1) FR2084353A5 (fi)
GB (1) GB1348506A (fi)
NO (1) NO128054B (fi)
SE (1) SE340085B (fi)
SU (1) SU402236A3 (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629555A (en) * 1981-10-16 1986-12-16 Colman Derek A Cyclone separator
US4859347A (en) * 1988-11-18 1989-08-22 Simon Wayne E Centrifugal separator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB608026A (en) * 1945-07-23 1948-09-08 Maximiliaan Gustaaf Driessen Improvements in and relating to cyclone separators
US3172844A (en) * 1960-10-21 1965-03-09 Escher Wyss Gmbh Cleaning apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB608026A (en) * 1945-07-23 1948-09-08 Maximiliaan Gustaaf Driessen Improvements in and relating to cyclone separators
US3172844A (en) * 1960-10-21 1965-03-09 Escher Wyss Gmbh Cleaning apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629555A (en) * 1981-10-16 1986-12-16 Colman Derek A Cyclone separator
US4859347A (en) * 1988-11-18 1989-08-22 Simon Wayne E Centrifugal separator

Also Published As

Publication number Publication date
FI51515B (fi) 1976-09-30
CA958347A (en) 1974-11-26
SU402236A3 (fi) 1973-10-12
JPS543254B1 (fi) 1979-02-20
FR2084353A5 (fi) 1971-12-17
DE2111760A1 (de) 1971-09-30
FI51515C (fi) 1977-01-10
NO128054B (fi) 1973-09-24
SE340085B (fi) 1971-11-08
GB1348506A (en) 1974-03-20

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