US 3283909 A
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Description (OCR text may contain errors)
Nov. 8, 1966 E. A. DAUBMAN 3,283,909
CENTRIFUGAL SEPARATOR Filed Dec. 20, 1963 INVENTOR. fan Amp Q flm/aM/sm/ United States PatentO 3,283,909 CENTRIFUGAL SEPARATOR Edward A. Daubman, East Moline, Ill., assignor to Ametek, Inc., New York, N.Y., a corporation of Delaware Filed Dec. 20, 1963, Ser. No. 332,161 2 Claims. (Cl. 210380) to be retained, and maximum strength to resist pressure and abrasion are the chief requirements of a lining. To promote drainage, a lining should always be separated from the perforated basket wall by a supporting backing screen. To minimize leakage of solids, sealing inside the basket at the top and bottom circumferences must be provided by folding back the top and bottom edges of the lining around the corresponding edges of the backing screen. Effective sealing is finally accomplished by the installation of expansion rings which, when tightened, force the top and bottom edges of the lining and screen tightly against the basket wall.
The principal object of this invention is to provide a perforated basket of a centrifugal separator with a readily attachable, expansible lining retaining means which will effectively force the top and bottom edges of the lining into sealing relation with a perforated basket.
Another object of the invention is to provide such a lining retaining means which will not interfere with the stationary housing within which the basket rotates.
Still another object of the invention is to provide such a basket and lining retaining means which will not impart any imbalance to the basket to which it is attached.
In one aspect of the invention, a centrifugal separator may comprise a housing that may be suspended from standards at spaced points about the housing so that the housing may be capable of limited oscillatable motion. A perforated basket may be mounted within the housing for rotation about a vertical axis. It may be connected to a vertical spindle that extends downwardly through the bot tom of the housing and to which pulley means may be connected, said pulley means being belted to other pulley means on the output shaft of a driving motor.
In another aspect of the invention, a lining of filter media may be located on the interior surface of the perforated basket and it may be held from engagement with the basket wall by a screen. The top and bottom edges of the lining may be folded over the corresponding edges of the screen, between it and the inner surface of the basket.
In still another aspect of the invention, a perforated protecting plate may be made from relatively thin sheet metal, and when mounted within the basket, its peripheral wall may be placed against the filter media protecting it from damage during the unloading of collected solids.
In a still further aspect of the invention, one or more expansible lining retaining bands may be located within the basket and may be expanded into firm contact with the protecting plate, forcing the lining of filter media into firm sealing relation with the interior wall of the basket.
In still another aspect of the invention, the bands may be made of a single loop construction having turnbuckle means joining the free ends thereof so that the loop can be expanded or contracted by simply turning the turnbuckle means.
In a still further aspect of the invention, the band may be made of semicircular straps provided with diametrically disposed turnbuckle means for facilitating expansion and contraction of the band.
The above, other objects and novel features of the invention will become apparent from the following specification and accompanying drawing which are merely exemplary.
In the drawing:
FIG. 1 is an elevational view of a centrifugal separator to which the principles of the invention have been applied;
FIG. 2 is a plan view of a band used in the basket of the separator of FIG. 1;
FIG. 3 is a modified form of the band of FIG. 2;
FIG. 4 is a sectional view of a turnbuckle means used with the bands of FIGS. 2 and 3.
Referring to the drawing, the principles of the invention are shown as applied to a centrifugal separator 10 including a housing 11 having flanges 12 at three equally spaced points about its periphery that extend into standards 13 on a base 14. Only one of the standards 13 and flanges 12 is shown. The flanges 12 may be connected to a flexible suspension within its corresponding standard 13 so that the housing has the capability of slight oscillatory movement during operation.
The housing 11 may include a vertical spindle 15 therein that extends out through the bottom of the housing and has a pulley 16 fixed to its lower end. Pulley 16 may be connected to.a pulley on the output shaft of a drive motor 17 by belts 18.
A basket 19 may be mounted within the housing 11 and connected to the spindle 15 for rotation therewith. The basket 19 may be open at the top for the reception of material to be centrifuged, and it may be made of perforated sheet material which is relatively thin with respect to basket diameter.
In order to retain fine solids during a centrifugal operation, a lining 20 is located within the prefo-rated basket 19. Lining 20 may include a cylindrical screen 21 having a layer of fabric 22 or other solids collecting media covering the inner surface of the screen 21. The upper and lower ends 23 and 24 0f the layer 22 may be folded over the upper and lower edges of the screen 21 and may lie between the screen and the inner periphery of basket 19. A protective sheet of perforated sheet metal 21A may surround the inner periphery of the filter lining as to prevent damage to the lining during removal of solids from basket 19. In order to hold lining 22, screen 21 and protective sheet 21A in sealing relation with the inner surface of basket 19, band means 25 may be expanded into firm engagement with the inner periphery of the lining at a plurality of points along the depth of the basket 19, and generally at the top and bottom of basket 19.
Referring to FIG. 2, the hoop 25 may comprise a substantially circular-1y formed piece of rod 26 having end portions that are formed as a chord of the circular form. The opposite ends 27, 28 of the rod 26 lie in aligned relation and may be provided with righthand and lefthand threads. Referring to FIG. 4, a turnbuckle 29 may include aligned recesses 30, 31 that are provided with internal threads that mate with the threads on the ends 28 and 27 respectively, of rod 26. The outer surface of the turnbuckle 29 may include surfaces that generally conform to the circular form of the hoop 25 so that lying within the extent of the chord portions, they provide a continuation of the circular hoop 25 through this chord portion.
Referring to FIG. 3, the expansible hoop 25 may be made of two substantially semicircular rods 32 and 33, the ends 34, 35 and 36, 37 of which are bent to lie parallel with each other, and when the semi-circular rods 32 and 33 are arranged as shown in FIG. 3, the ends 35, 37 and 34, 36 lie in aligned relation. Ends 35, 37 and 34,
36 have righthand and lefthand threads, and a turnbuckle 29 connects ends 35, 37 and 34, 36.
From the foregoing it is evident that expansible hoop .means have been provided that can be located at one or more locations within the basket 19 of a centrifugal separator and expanded into firm contact with a lining 20, screen 21 and sheet 21A, forcing the same into intimate contact with the inner wall of the basket 19 to retain fine solids within the slurry being centrifuged.
Although the various features of the combined centrifugal basket and lining retaining means have been shown and described in detail to fully disclose two embodiments of the invention, it will be evident that changes may be made in such details and certain features may be used without others without departing from the principles of the invention.
What is claimed is:
1. In a centrifugal separator, a housing; a spindle mounted in said housing; a basket made from a perforated aligned pair of ends being bent inwardly and extending along their length in a line defined by a plane passing through a chord of said hoop, turnbuckle means adjustably connecting the ends of each aligned pair to one another, said turnbuckle means having an outermost surface extending outwardly to substantially the outermost periphery of said hoop whereby said hoop and said turnbuckle means have coincident outer surfaces which engage the inner surface of said metal sheet; and means for rotating said spindle.
2. In a centrifugal separator according to claim 1, wherein said expansible hoop retaining means are located adjacent each of the ends of said basket, and the substantially semi-circular elements are threaded; and wherein said turnbuckle means connect the threaded ends of one element to the ends of the other.
References Cited by the Examiner UNITED STATES PATENTS 630,365 8/ 1899 Laplace 210380 815,874 3/1902 Stransky 210-480 830,230 9/ 1906 Holfbauer 2l0380 1,364,599 1/1921 Wilder 287 X 1,553,525 9/19-25 Erickson et ai 210380 1,770,854 7/ 1930 Johnson 2-103 2,306,091 12/1942 Thorneloe 210380 2,634,776 4/1953 Kowan et a1 210380 X 2,635,249 4/ 1953 Summers et al 287-60 X 2,639,811 5/1953 Sando et a1 210-237 X REUBEN FRIEDMAN, Primary Examiner. I. DE CESARE, Assistant Examiner.