US3319880A - Centrifugal drum - Google Patents

Centrifugal drum Download PDF

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Publication number
US3319880A
US3319880A US451127A US45112765A US3319880A US 3319880 A US3319880 A US 3319880A US 451127 A US451127 A US 451127A US 45112765 A US45112765 A US 45112765A US 3319880 A US3319880 A US 3319880A
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US
United States
Prior art keywords
casing
portions
drum
end wall
wall means
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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.)
Expired - Lifetime
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US451127A
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English (en)
Inventor
Pause Kurt
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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
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/18—Rotary bowls formed or coated with sieving or filtering elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]

Definitions

  • Centrifugal drums which have a continuous, non-perforated cylindrical casing and end walls in the form of annular discs rigidly connected by welding and preferably also by a shrink fit to opposite ends of the casing.
  • Such centrifugal drums have the advantage that the cylindrical casing can be constructed with a small wall thickness over the main portion of the length thereof, however, during operation of the centrifugal drum and rotation thereof at high speed about its axis there will occur in the planes of the opposite end walls increased bending stresses which will make it necessary to reinforce the end portions of the cylindrical casing of the drum.
  • the drum is to be made with a minimum wall thickness, it is necessary in this case to reduce the wall thickness of the cylindrical casing intermediate its ends, for instance by turning the casing in a lathe, which will obviously considerably increase the manufacturing costs thereof.
  • the shrinkage stress created in the end portions of the cylindrical casing during shrink fitting thereof onto the end walls is substantially cancelled during the welding operation and resulting heating of the welded portions to a high temperature, so that the bending stresses at the annular portions of the cylindrical casing to which the end walls are connected will vary between zero and a maximum value during operation of the centrifugal drum.
  • the centrifugal drum according to the present invention mainly comprises a centrifugal casing having opposite open ends, a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed flange portion extending substantially in direction of the axis of the drum and engaging with the outer surface thereof the inner surface of the casing and being formed with a plurality of axial extending angularly spaced slots therethrough.
  • the outer surface of the annular flange portion of the end wall means is also pre ferred to form the outer surface of the annular flange portion of the end wall means as a frustoconical surface having a small cone angle and its smallest diameter at the end edge of the annular flange portion.
  • the drum construction according to the present invention permits also to provide the necessary openings for discharging the centrifuged liquid without weakening the casing by forming in a peripheral portion of the transverse wall portions of the end wall means slots respectively aligned with the corresponding slots in the flange portions of the end wall means.
  • FIG. 1 is an axial cross section through centrifugal drum according to the present invention
  • FIG. 2 is a top view of the drum shown in FIG. 1;
  • FIG. 3 is a cross section along the line IIIIII of FIG. 2 and drawn to an enlarged scale;
  • FIG. 4 is a cross section along the line IVIV of FIG. 2 and likewise drawn to an enlarged scale.
  • the centrifugal drum according to the present invention comprises a cylindrical, non-perforated casing 4 of substantially uniform wall thickness and a pair of end wall means tightly fitted in opposite ends of the cylindrical casing and each having a transverse annular and disc-shaped wall portion respectively designated 1 and 2 located inwardly of the respective end of the casing 4 and an outwardly directed annular flange portion 3 extending substantially in direction of the axis of the drum and engaging with the outer surface thereof the inner surface of the casing.
  • Each of the annular flange portions 3 is formed with a plurality of slots 5 which are equally spaced from each other and which extend in axial direction from the free edge of the flange portion 3 up to the respective transverse wall portion.
  • the free edge faces of the flange portions 3 are substantially flush with the opposite edge faces of the cylindrical casing 4.
  • the outer surface of each flange portion 3 is preferably formed as frustoconical surfaces having a small cone angle. The small diameter of the frustoconical surface is located at the outer free edge of the flange portion 3.
  • the transverse portions 1 and 2 of the end wall means are manufactured with an outer diameter greater than the inner diameter of the casing 4 at the opposite ends I thereof, and the end wall means are fastened in the oppo- 3 site ends of the casing 4 by shrink fitting.
  • the difference between the outer diameter of the transverse portions 1 and 2 of the end wall means and the inner diameter of the casing 4 at the opposite ends thereof before shrink fitting is preferably chosen in such a manner that after shrink fitting of the casing 4 onto the end wall means, the casing 4 will be expanded in the planes of the transverse portions 1 and 2 of the end wall means to half of the maximum expansion occurring at a central portion of the casing during operation of the centrifugal drum.
  • FIG. 3 illustrates the centrifugal drum not stressed by centrifugal forces. Due to the shrink fitting of the end portions of the casing 4 onto the transverse wall portions 1 and 2 of the end wall means, the end portions of the durm 4 have been expanded and this expansion is greatest, as shown in FIG. 3 in the plane of the transverse wall portions 1 and 2 of the end wall means and due to the conical configuration of the flange portion 3 of the end wall means, smallest at the outer free edge of the casing 4. Since the annular flange portions of the end wall means 1 and 2 are separated by the slots 5 in a plurality of adjacent fingers, these fingers will, during cooling of the end portions of the casing 4, also be bent slightly inwardly as best shown in FIG. 4.
  • the cylindrical casing will be subjected, as known, to an outward expansion as illustrated in FIG. 4 and, as mentioned before, the outer diameter of the wall portions 1 and 2 and the inner diameter of the casing 4 before assembly is chosen in such a way so that the maximum outward expansionoccurring in the casing 4 during operation of the drum is substantially twice the outward deformation which occurs in the end portions of the casing in the planes of the transverse wall portions 1 and 2 after shrink fitting the end portions of the casing onto the end wall means.
  • the flange portions 3 of the end wall means are secured to the end portions of the cylindrical casing 4 by screws 10, one of which is shown in FIG. 4.
  • screws 10 one of which is shown in FIG. 4.
  • spot weld the flange portions 3 to the end portions of the casing 4 and such spot welding is preferably made at or adjacent to edge faces of casing and flange portions 3 as indicated at 11 in FIG. 3.
  • the transverse wall portions 1 and 2 of the end wall means a plurality of slots 6 extending in axial directions through the transverse wall portions and in radial direction a short distance from the outer periphery thereof, and the slots 6 are respectively aligned with the slots 5 in the annular Wall portions 3.
  • the drum includes also, as schematically indicated in FIGS. 3 and 4, inner sieve means 8 arranged about the inner surface of the casing 4 and inwardly of the inner ends of the slots 6 and supported on the inner surface of the casing 4 by spacer sieve means 7 so that the liquid to be centrifuged may pass through the inner sieve means 8 and along the supporting sieve means 7 through the slots 6 in the transverse wall portions 1 and 2 and through the slots 6 in the flange portions to the outside of the drum.
  • inner sieve means 8 arranged about the inner surface of the casing 4 and inwardly of the inner ends of the slots 6 and supported on the inner surface of the casing 4 by spacer sieve means 7 so that the liquid to be centrifuged may pass through the inner sieve means 8 and along the supporting sieve means 7 through the slots 6 in the transverse wall portions 1 and 2 and through the slots 6 in the flange portions to the outside of the drum.
  • a centrifugal drum in combination, a continuous cylindrical casing having opposite open ends; and a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion extending substantially in direction of the axis of said drum and engaging with the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough.
  • a centrifugal drum in combination, a continuous cylindrical casing having opposite open ends; and a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion extending substantially in direction of the axis of said drum and engaging with the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough, each of said flange portions having an outer edge face substantially flush with a corresponding edge face of said cylindrical facing.
  • a continuous cylindrical casing having opposite open ends and a pair of frustoconical end portions of small cone angle each having its smallest diameter at the respective open end of said casing; and a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion tapering substantially at the same angle as the respective frustoconical end portions of said casing so as to engage with the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough, each of said flange portions having an outer edge face substantially flush with a corresponding edge face of said cylindrical facing.
  • a continuous cylindrical casing having opposite open ends; a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion extending substantially in direction of the axis of said drum and engaging with the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough; and means securing said flange portions to said cylindrical casing.
  • a continuous cylindrical casing having opposite open ends and a pair of frustoconical end portions of small cone angle each having its smallest diameter at the respective open end of said casing; a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion tapering substantially at the same angle as the respective frustoconical end portions of said casing so as to engage With the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough; and screw means connecting said flange portions to said casing.
  • a continuous cylindrical casing having opposite open ends and a pair of frustoconical end portions of small cone angle each having its smallest diameter at the respective open end of said casing; a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion tapering substantially at the same angle as the respective frustoconical end portions of said casing so as to engage with the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough; and weld means connecting said flange portions to said casing.
  • a centrifugal drum in combination, a continuous cylindrical casing having opposite open ends; and a pair of end wall means shrink fitted in said open ends and each having a transverse wall portion extending transversely through and inwardly of the respective open end and an outwardly directed annular flange portion extending substantially in direction of the axis of said drum and engaging with the outer surface thereof the inner surface of said casing, said annular flange portion being formed with a plurality of axially extending angularly spaced slots therethrough, each of said transverse wall portions being formed at the outer periphery thereof with a plurality of short slots therethrough respectively axially aligned with slots in said flange portion.
  • a centrifugal drum comprising, in combination, a cylindrical casing having a continuous wall of uniform thickness, a pair of open ends and a pair of frustoconical end portions of small cone angle and each having its smallest diameter at the respective open end of said casing; a pair of end wall means shrink fitted in said open ends of said casing and each having a transverse wall portion extending transversely and inwardly of the re spective open end and an outwardly directed flange portion tapering substantially at the same angle as the respective frustoconical end portion of said casing so as to engage with the outer surface thereof the inner surface of the respective end portion, each of said flange portions having an outer edge face substantially flush with a corresponding edge face of said casing and being formed with a plurality of substantially equally spaced axially extending slots therethrough and said transverse wall portion being formed in an outer peripheral region thereof with a plurality of shallow slots therethrough respectively aligned with corresponding slots through said flange portion; means securing said flange portions
  • a method of manufacturing a centrifugal drum comprising the steps of forming a cylindrical casing having opposite open ends of a given inner diameter; forming a pair of end wall means having each a transverse wall portion of a diameter slightly greater than said given diameter and being formed in an outer peripheral portion thereof with a plurality of axially extending shallow slots therethrough circumferentially spaced from each other, and an annular flange portion extending substantially normal to and from said outer peripheral portion of said transverse wall portion and being formed with a plurality of axially extending slots therethrough respectively axially aligned with said slots in said transverse wall portion; shrink-fitting said pair of end wall means into said open ends of said casing with said transverse wall portions located inwardly of said open ends and said flange portions respectively extending in outward direction and engaging corresponding portions of said casing; and securing said flange portions to said portions of said casing.
  • a method of manufacturing a centrifugal drum comprising the steps of forming a cylindrical casing having opposite open ends of a given inner diameter; forming a pair of end wall means having each a transverse wall portion of a diameter slightly greater than said given diameter and being formed in an outer peripheral portion thereof with a plurality of axially extending shallow slots therethrough circumferentially spaced from each other, and an annular flange portion extending substantially normal to and from said outer peripheral portion of said transverse wall portion and being formed with a plurality of axially extending slots therethrough respectively axially aligned with said slots in said transverse wall portion; shrink-fitting said pair of end wall means into said open ends of said casing with said transverse wall portions located inwardly of said open ends and said flange portions respectively extending in outward direction and engaging corresponding portions of said casing; and securing said flange portions in the region of the edge faces thereof by spot Welding to said casing.

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  • Centrifugal Separators (AREA)
US451127A 1964-05-02 1965-04-27 Centrifugal drum Expired - Lifetime US3319880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP34189A DE1236417B (de) 1964-05-02 1964-05-02 Vollmantel-Schleudertrommel

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US3319880A true US3319880A (en) 1967-05-16

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US (1) US3319880A (cs)
DE (1) DE1236417B (cs)
GB (1) GB1098497A (cs)
NL (2) NL6505587A (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854657A (en) * 1973-04-23 1974-12-17 Buckau Wolf Maschf R Drum for a centrifuge
US4639320A (en) * 1985-04-05 1987-01-27 United Coal Company Method for extracting water from solid fines or the like
US4640770A (en) * 1985-04-03 1987-02-03 United Coal Company Apparatus for extracting water from solid fines or the like
WO1987007533A1 (en) * 1986-06-16 1987-12-17 Ab Kompositprodukter S.K.-F.M. A screw joint

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1916280B1 (de) * 1969-03-29 1970-06-04 Buckau Wolf Maschf R Periodisch arbeitende Zentrifuge zum Abschleudern von Fuellmasse
DE2546661C2 (de) * 1974-10-18 1985-08-14 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Zentrifuge

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2401231A (en) * 1942-05-18 1946-05-28 Smith Corp A O Hot-water tank and method of making the same
US2657803A (en) * 1949-09-01 1953-11-03 Lummus Co Centrifugal filtration
US2683562A (en) * 1953-01-21 1954-07-13 Emil L Ranseen Centrifugal separator
US2872105A (en) * 1946-09-16 1959-02-03 Frank C Rushing Rotor end cap
US3212843A (en) * 1950-12-29 1965-10-19 Gen Electric Co Ltd End closure for rosette-shaped centrifuges
US3282498A (en) * 1963-06-10 1966-11-01 Lloyd B Smith Construction for high gravity centrifuges and the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2401231A (en) * 1942-05-18 1946-05-28 Smith Corp A O Hot-water tank and method of making the same
US2872105A (en) * 1946-09-16 1959-02-03 Frank C Rushing Rotor end cap
US2657803A (en) * 1949-09-01 1953-11-03 Lummus Co Centrifugal filtration
US3212843A (en) * 1950-12-29 1965-10-19 Gen Electric Co Ltd End closure for rosette-shaped centrifuges
US2683562A (en) * 1953-01-21 1954-07-13 Emil L Ranseen Centrifugal separator
US3282498A (en) * 1963-06-10 1966-11-01 Lloyd B Smith Construction for high gravity centrifuges and the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854657A (en) * 1973-04-23 1974-12-17 Buckau Wolf Maschf R Drum for a centrifuge
US4640770A (en) * 1985-04-03 1987-02-03 United Coal Company Apparatus for extracting water from solid fines or the like
US4639320A (en) * 1985-04-05 1987-01-27 United Coal Company Method for extracting water from solid fines or the like
WO1987007533A1 (en) * 1986-06-16 1987-12-17 Ab Kompositprodukter S.K.-F.M. A screw joint
US5000730A (en) * 1986-06-16 1991-03-19 Ab Kompositprodukter S.K.-F.M. Screw joint

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Publication number Publication date
GB1098497A (en) 1968-01-10
NL128842C (cs)
DE1236417B (de) 1967-03-09
NL6505587A (cs) 1965-11-03

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