US3076552A - Removing liquid containing capillary layer from material being centrifuged - Google Patents

Removing liquid containing capillary layer from material being centrifuged Download PDF

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Publication number
US3076552A
US3076552A US5177A US517760A US3076552A US 3076552 A US3076552 A US 3076552A US 5177 A US5177 A US 5177A US 517760 A US517760 A US 517760A US 3076552 A US3076552 A US 3076552A
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Prior art keywords
drum
slider
openings
centrifuged
discharge end
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Expired - Lifetime
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US5177A
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English (en)
Inventor
Ruegg Ernst
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Sulzer Escher Wyss AG
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Escher Wyss AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges

Definitions

  • This invention relates to a device by which separation of liquid from the material being centrifuged in the centrifugal drum of a centrifuge, more particularly a continuously operating push-type centrifuge, is improved.
  • the material being centrifuged is gradually conveyed over the strainer surface of the centrifugal drum by means of a pusher member from the supply end toward the discharge end of the drum and then falls into a collector.
  • the strainer device 7 is shown in FIG. 2 on a larger scale. It comprises a strainer cylinder 9 situated in the drum 3 and provided with holes 10 which open into spaces 11 with discharge openings 12 of the drum 3. The inner surface of the cylinder 9- is smooth.
  • chambers 15 arranged so as to co-operate with the perfoliquid is continuously removed from the material, until at the discharge end of the drum, there is immediately on the strainer a capillary layer containing liquid which can no longer be removed by centrifuging, and above this layer is centrifugally dry solid material with uniformly distributed moisture.
  • the capillary layer entering the collector along with the centrifugally dry solid material and still containing liquid promotes the formation'of drifts in the collector and impairs the degree of dryness, since its liquid content can substantially increase the mean moisture content of the solid material discharged into the collector.
  • a continuously operating centrifuge which comprises at least one rotatable sieve drum having a supply end and a discharge end, means for feed ing material to be centrifuged to said supply end, and conveying means arranged within said sieve drum by which a layerof the material fed'to the supply end is conveyed toward said discharge end while being centrifuged
  • the sieve drum is provided for this purpose, according to the invention, with means for separately discharging a fraction of material immediately adjacent the drum.
  • FIG. 1 shows an axial vertical section through a pushtype centrifuge.
  • FIG. 2 shows the discharge end of the sieve drum shown in FIG. 1, on a larger scale.
  • FIG. 3 shows an axial vertical part section through the sieve drums of a two-stage push-type centrifuge.
  • FIGS. 4 to 6 show part sections through sieve drums with an annular funnel at the drum end
  • FIG. 7 shows a device with re-centrifuging drum.
  • the continuously operating push-type centrifuge shown in FIG. 1 has a housing 1 with a collector 2, a rotatable sieve drum 3 having a supply end and a discharge end, a pusher member 4 arranged within the sieve drum 3 at the supply end thereof so as to be axially reciprocatable in relation to the drum 3, and an inlet hopper 5 for feeding material to be centrifuged arriving from an inlet pipe 6 to the supply end of the drum 3.
  • the drum 3 is provided with a strainer device 7, on which a layer 8 of material being centrifuged is advanced gradually in the axial direction from the supply end toward the discharge end of the drum 3 by means of rations 14 of the drum section.
  • the material being centrigued is conveyed over the strainer cylinder 7 and travels over the perforations 14, which are so arranged or formed that they comprise all generatrices of the strainer cylinder.
  • the capillary layer then passes into chambers 15 of the sluicing slider 16 (when the slider is in the position shown in FIG. 2).
  • the capillary layer portions fall from the chambers 15 through openings 17 of the centrifugal drum into a collector 18.
  • the liquid film forming on the strainer cylinder 7 is also sluiced out by these measures.
  • the slider 16 is moved by means of rods 19. The latter are connected with the pusher member 4 as indicated in FIG. 1.
  • a sluicing slider 22 of the drum 21 is connected by rods 23 to the adjacent drum 20 which acts as a pusher member for the material being centrifuged within the drum 21.
  • the device for discharging the capillary layer comprises an annular funnel 25 fixed to the discharge end of the drum 24 filled with material being centrifuged, a layer 27 of the said material moving forward on the drum.
  • the inlet opening 26 of said funnel is flush with the interior surface of the sieve drurn, so that the material travels over said opening.
  • a capillary layer is then formed again. If the opening 28 is suitably dimensioned, this'latter layer discharges of its own accord into a collector 29, and a corresponding quantity of material enters through the opening 26.
  • a sluicing slider 31 is provided for intermittent sluicing of the capillary layer.
  • the mode of operation of the sluice 30, 31 corresponds to that of the sluice 13 according to FIGS. 1 and 2.
  • the device according to FIG. 6 also has an annular funnel, namely the funnel 33, arranged at the drum end 32. At its discharge end, the funnel 33 extends into an annular channel of U-shaped cross-section containing a solvent liquid flushing bath 34.
  • the solvent liquid is fed to the bath via conduit 35.
  • the capillary layer and possibly also other portions of the centrifuged material are dissolved by the solvent and are discharged through perforations 36 in a side wall of the bath channel into a collector 37.
  • the inlet opening of the funnel 33 may be covered entirely or partly by a strainer or strainer bars on which slides the layer of centrifuged material pushed over the opening.
  • the strainer device may have over a large portion of the drum length or over the entire drum, sluicing devices for the capillary layer or its liquid.
  • a further sieve drum 38 re-centrifuging the capillary layer, follows an annular funnel 39, arranged at the discharge end of a sieve drum.
  • the funnel 39 forms the supply funnel for said re-centrifuging drum 38.
  • the supply end of the latter encircles the funnel 39 in close proximity to the discharge opening thereof.
  • the drum 38 is axially shiftable in relation to the funnel 39 and the sieve drum connected therewith in the same way as the sluicing slider 16 or 22 of the constructional forms shown in FIGS. 1 to 3.
  • the funnel 39 is so shaped as to act as a pusher member for the material to be conveyed within the re-centrifuging drum 38.
  • the capillary layer arriving wet on the drum 38 will not at first be very capable of being pushed and will pile up. After a suitable quantity of liquid has been removed by centrifuging, however, it will form a layer which can be pushed. It is true that a capillary layer will again be formed in the latter, but it will hardly be of any significance quantitatively, compared with the total quantity of discharged centrifuged material.
  • a centrifugally dry layer 41 advancing over the inlet opening of the funnel 39 passes over an annular guide plate 42 into a collector 43, while the layer 40 issuing from the re'centrifuging drum 38 falls into a collector 44. Both layers (48, 41), however, may be led into a common collector.
  • a continuously operating centrifuge including at least one rotatable sieve drum having a supply end and a discharge end, means for feeding material to be centrifuged to said supply end, and conveying means for conveying the material during centrifugation toward said discharge end, the improvement which comprises:
  • a sluicing device for separately discharging at least a portion of the material lying immediately adjacent the inner peripheral surface of the drum, said sluicing device comprising:
  • a sluicing slider carried by the drum and interposed between the drum and said member, the slider containing a chamber and being movable relatively to the drum between first and second positions in which, respectively, the chamber registers with the opening and the passage, the slider being so arranged that as it moves from the first to the second position the chamber is disconnected from said opening and then connected with said passage, and as it moves from the second to the first position the chamber is disconnected from said passage and then connected with said opening.
  • a continuously operating push-type centrifuge including at least one rotatable sieve drum having a supply end and a discharge end, means for feeding material to be centrifuged to said supply end, and a longitudinally reciprocable pusher located in the drum and arranged to convey the material during centrifugation toward said discharge end, the improvement which comprises:
  • a sleeve connected with and spaced radially from the outer periphery of the drum, the sleeve being imperforate in the region of the openings but containing a circumferential series of through radial passages spaced longitudinally from said openings;
  • annular sluicing slider interposed between the drum and the sleeve and containing a plurality of through chambers, the slider being reciprocable in the longitudinal direction of the drum between a first position in which the chambers register with said openings and a second position in which the chambers register with said through radial passages;
  • a. means connecting the slider with the pusher so that the former is reciprocated by the latter.

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  • Centrifugal Separators (AREA)
US5177A 1959-03-02 1960-01-28 Removing liquid containing capillary layer from material being centrifuged Expired - Lifetime US3076552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH7023459A CH368425A (de) 1959-03-02 1959-03-02 Siebeinrichtung an der Schleudertrommel einer Zentrifuge

Publications (1)

Publication Number Publication Date
US3076552A true US3076552A (en) 1963-02-05

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US5177A Expired - Lifetime US3076552A (en) 1959-03-02 1960-01-28 Removing liquid containing capillary layer from material being centrifuged

Country Status (6)

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US (1) US3076552A (de)
BE (1) BE587786A (de)
CH (1) CH368425A (de)
DE (1) DE1091944B (de)
FR (1) FR1245936A (de)
GB (1) GB942396A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH624858A5 (de) * 1977-11-25 1981-08-31 Escher Wyss Ag

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686595A (en) * 1950-08-11 1954-08-17 Baker Perkins Inc Centrifugal separator
GB720919A (en) * 1952-05-19 1954-12-29 Escher Wyss Ag Push-type centrifugal machine
US2755934A (en) * 1953-02-10 1956-07-24 Escher Wyss Ag Multi-stage centrifugal machine
AT201513B (de) * 1957-07-06 1959-01-10 Escher Wyss Ag Mehrstufige Schubzentrifuge
US2899065A (en) * 1953-05-25 1959-08-11 irving
US2982411A (en) * 1955-07-22 1961-05-02 Stamicarbon Moisture separation from granular materials
US2991887A (en) * 1956-12-19 1961-07-11 Wirth Thomas Vibratory centrifuge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686595A (en) * 1950-08-11 1954-08-17 Baker Perkins Inc Centrifugal separator
GB720919A (en) * 1952-05-19 1954-12-29 Escher Wyss Ag Push-type centrifugal machine
US2755934A (en) * 1953-02-10 1956-07-24 Escher Wyss Ag Multi-stage centrifugal machine
US2899065A (en) * 1953-05-25 1959-08-11 irving
US2982411A (en) * 1955-07-22 1961-05-02 Stamicarbon Moisture separation from granular materials
US2991887A (en) * 1956-12-19 1961-07-11 Wirth Thomas Vibratory centrifuge
AT201513B (de) * 1957-07-06 1959-01-10 Escher Wyss Ag Mehrstufige Schubzentrifuge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator
US11833458B2 (en) * 2019-11-18 2023-12-05 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Also Published As

Publication number Publication date
CH368425A (de) 1963-03-31
BE587786A (fr) 1960-06-16
DE1091944B (de) 1960-10-27
GB942396A (en) 1963-11-20
FR1245936A (fr) 1960-11-10

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