US1695193A - Apparatus for separating solids from liquids - Google Patents

Description

Dec. l1, 1928. Y 1,695,193

' R. F. KRALL APPARATUS FOR SEPARATING SOLIDS FROM LIQUIDS Filed April 24', 1926 ff QM/@ Patented Dec. 11, 1928.

UNITED STATES PATEN'T' GFFICE.

REGINALD FRANK KRALL, OF LONDON, ENGLAND, ASSIGNOR T IVOODlIiL-DUCKHAM (1920) LIMITED, 0F LONDON, ENGLAND, A BRITISH COMPANY.

APPARATUS SEPARATING -SOLIDS FROM LIQUIDS.

Application led April 24, 1926, Serial No. 104,460, and in Great Britain August 28, 1925.

on to a distributing plate mounted on a verf tical shaft which is co-axial with a substantially conical screen, also mounted larger end downwards, on the shaft. The shaft being rotated the material is thrown oft the plate against the screen down which it travels, preferably in steps as described in the said specitication,becoming dried during its progress. At the bottom of the screen it is thrown against the wall of a stationary hopper wherein it collects.

The present invention relates to improvements in apparatus of this kind for the purpose of facilitating its operation and rendering it more eilicient.

In the known construction it was found necessary to provide the` necessaryy clearance between the rotating screen and the collecting hopper by means of a tortuous passage in order to avoid entry of the water spray, which fills the closed casing around the screen, through the clearance into the ho per, where it would re-wet the material. It was found, however, that, since dust would enter the clearance and become caked when the machine was idle, difficulties were encountered when the machine was to be restarted and which required a high expenditure of power.

An object of the present invention is to overcome the disadvantages associated with the known type of apparatus referred to. For this purpose, theclearance between the lower part of the rotating screen and the hopper which receives the dried material is formed between a pair of rings, thin in the radial direction, one of which Vdepends from the screen and the other of which extends upwardly from the hopper, with the lower edge of the depending ring in close proximity to the upper edge of the upstanding ring. The clearance between these two rings may be reduced to such small dimensions that the quantity of caked dust existing in it when indicated. From the screen the material passes into the hopper (Z, the upper part of which is alone shown in the drawing.

In the known construction the casing e is closed to the atmosphere; in the present case the casing has openings f. To act as a water collecting screen there is a non-perforated hood g depending from the top of the casing; the water draining from this hood falls into the trough 7i. l

The joint between the bottom ring c of the screen and the ring CZ which .carries the hopper d is shown in Fig. 8. The ring c carries a depending ring c2 and the ring d an upstanding ring Z2 of the Vsame diameter. The clearance between these rings c2, cl2 may be reduced to such small dimensions that the quantity of caked dust which may exist in it when the machine is to be re-started cannot create any diiiiculty. By setting the ring o2 at some little distance from the periphery of ring c as indicated, the clearance between rings c2 and Z2 is sheltered from water splashing.

In the modification shown in Fig. 2 the upper part of the casing o is eliminated, the frame members z' being provided merely for carrying the usual machinery guards for protecting operatives. The shaft 7c carries on arms Z the conical non-perforatedplate m on the interior surface of which are studs n; to the latter the conical screen c is suitably attached. Thus the plate which collects the water rotates, with the advantage that there is less splashing thanvwhen the screen is stationary.

This last-named advantage may facilitate the construction because the clearance between the screen and the collecting hopper d may be as large as is reasonable. In the case shown on the right hand side of Fig. 2 the lowest ring c of the screen carries a conical ring 0 which extends into the mouth ot the hopper Z with considerable clearance, the latter being protected by a similar conical ring p carried by the casing and extending upwards sutliciently to intercept drops trom the plate m.

The rotary plate fm lends itself to ready washing, and for this purpose a water-pipe g is arranged to discharge aga-inst the upper part ot' the interiorsurtace of the plate. This involves a somewhat heavy discharge ot water and the modification shown on the lett hand side ot Fig. Q is preferable. Here a battle-ring 9' to detlect the water directly into the trough 7L, is carried by the trame members fi. A 'joint is constructed at s similar to that shown in Fig. 3.

Having thus fully described the nature ot the said invention and the best means I know ot carrying the` saine into practical e'fiiect, I claim l. A drying apparatus comprising a substantially conical screen haviiig its axis substantially vertical. and its larger end extending downwardly and adapted to be rotated about its axis, means for projecting particles of material to be dried against the inner surtace ot the screen, means tor feeding material to the said projecting means, a hopper positioned below said screen to receive dried inaterial leavingl the lower end' of the screen, a ring depending from said screen, and a ring coaxial with and ofthe saine diameter as said tiret-named ring and upstanding from the hopper with its upper edge in close proximity to the lower edge oit the first-named ring and cooperating with the latter to term a clearance between the screen and the hopper.

2. An apparatus according to claim l comprising an imperi'iorate plate surrounding and supporting the screen.

3. A drying apparatus comprising a substantially conical screen having its axis substantially vertical and its larger end extending downwardly and adapted to be rotated about its axis, means for projecting particles ol" material to be dried against the inner surface of said screen, means for feeding material to said projecting means, a hopper positioned below said screen and adapted to receive dried material as it leaves the lower end ot the screen, atroughsurrounding the hopper and a conical ring extending upwardly from the mouth of the hopper into proximity to the lower end of the screen to divert splashes of liquid from the clearance between said mouth and the screen into said trough.

' 4. An apparatus according to claim l, comprising a conical plate surrounding and spaced from the screen and means tor discharging water upon the upper part ot the inner surface of said plate. y

5. An apparatus according to claim l, coinprising a conical plate surrounding and spaced from the screen, a trough below the lower end ot' said plate, means t'or discharging water against the inner surface ot said plate anda baille to receive the water as it leaves said plate and direct it into said trough.

6. A drying apparatus comprising a substantially conical screen having its axis substantially vertical and its larger end extending downwardly and' adapted to be rotated about its axis, means tor projecting particles ot material to be dried against the inner surtace ot the screen, means tor feeding material to the said projecting means, a hopper positioned below said screen to receive dried material leaving'the lower end ot the screen, a ring depending from said screen and ot slightly less diameter than the external diameter of the lower end of the screen, and a ring coaxial with and of the saine diameter as said tirst-named ring and upstanding from the hopper with its upper edge in close proximity to the lower edge ot the tirst-named ring and cooperating with the latter to form a clearance between the screen and the hopper.

In testimony whereof I have signed my name to this specification.

' REGINALD FRANK KRALL.

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