US2197911A - Centrifugal separator - Google Patents

Description

Apnl 23, 1940. G. H. ANDERssoN CENTRIFUGAL SEPARATOR Filed Sept. 9, 1937 Patented Apr. 23, 1940 CETRIFUGAL SEPARATOR Gustav Harry Andersson, Appelviken, Sweden, assigner to The De Laval Separator Company, New York, N. Y., a corporation of New Jersey Application September 9, 1937, Serial No. 162,986 In Germany October 17, 1936 1 Claim.

This invention relates to centrifugal separators in which the lighter liquid is discharged by a stationary paring device projecting into the bowl during operation.

In centrifugal separators of this type it has been customary to use an open outlet for the heavier liquid, which outlet is located below the chamber containing the paring device. The outlet in this case is through an opening which can be regulated by a screw or the like.

For certain purposes, however, it is desirable to use an outlet in the form of a level outlet, the radius of the free surface of liquid determined thereby being controlled by an exchangeable so-called regulating disc. It is, of course, possible to arrange such a regulating disc below the parer chamber, i. e., between this chamber and the separating chamber. In such a case, however, either the inner diameter of the disc must be so great that the disc can be put in place over the outer wall of the parer chamber, or the parer chamber must be detachably secured to the centrifugal bowl. And since the radius of the liquid surface is determined by the diameter of the outlet in the regulating disc, the rst alternative results in unnecessarily great power consumption; while the second alternative presents an exceedingly difficult and troublesome problem from the standpoint of manufacture and operation.

In accordance with the invention, these difeulties are avoided by providing a level outlet for the heavier liquid above the parer chamber and thus axially outside the paring discharge device.

The accompanying drawing shows several embodiments of the invention.

Fig. l is a fragmentary section view through a centrifugal separator designed in accordance with this invention; and

Fig. 2 is a detail sectional view showing a modied type of outlet for heavier liquid.

Referring to Fig. 1, the paring device comprises a parer disc I, enclosed by a paring chamber 2 arranged in and rotating with the bowl. The lighter liquid flows into the chamber 2 through a central opening 3, communicating with the inner part of the separating chamber 4 of the bowl. From the outer part of the separating chamber channels 5 extend to the upper edge of the bowl neck above the chamber 2 and are partly closed at the top by an exchangeable annular regulating disc 1 from the rim 8 of which the liquid is thrown into a collecting chamber, not shown, in the hood of the bowl.

The chamber 2 is located in that member which separates the Separating chamber from the channels 5. As shown in the figure, the lower wall I I may be removably secured to the rest of chamber 2. The'paring disc Imay, if desired, be provided with a number of vertical channels I2,`

fixed pipe lines through the hinge of the cover,

in known manner.

Referring to Fig. 2, which shows a modified type of outlet, the lighter liquid flows into the chamber 2 through a plurality of openings 3 in the member y II', which openings are desirably positioneds'ufliciently near the bowl axis to form `a level outlet for the lighter liquid,rso that its free surface in the parer chamber 2 has a greater radius than in the chamber Il. The channels 5f lead from the outer part of the separating chamber I vtoa chamber 6 positioned above the chamber 2 and bounded at the top by an upwardly dished regulating disc l', from the rim 8 of which the heavier liquid is thrown intoa col.I

lecting chamber formed by the hood'9 covering the separator bowl, and a lid I0 provided there'- above.

In the construction shown in Fig. 1, if the lighter liquid' should overflow the chamber 2 it would discharge into the collecting chamber for the heavier liquid and be mixed therewith. This contingency is prevented by thev structure shown in Fig. 2, where the upper wall of the chamber 2 is provided with an upwardly projecting neck I5, over which any overilow from the chamber 2 is discharged into a special collecting chamber,

not shown. v

In the bottom of the bowl 4 drain channels II are provided, the inner orifices of which are ordinarily situated inside the level of the liquid, but which act as overflowl channels when the sludge space of the bowl is filled with solid matter which clogs the normal path of flow through stantially consists of an arm I'I which, in known manner, is axially movable and is provided with a screw I8, which is screwed into a thread I9 in the central part of the bowl, the screw being introduced through the inlet tube 20 which is built integrally with the paring disc I. The arm I'I is provided with a downwardly projecting skirt 2|, which rests on the upper portion of the bowl and guides it in relation to the arm I1.

What I claim and desire to protect by Letters Patent is:

A centrifugal separator comprising a bowl having an upwardly extending neck portion and, extending inwardly therefrom, members forming the upper and lower walls of a lighter liquid parer chamber, a stationary paring device extending into said parer chamber, there being an opening in the lower of said walls communicat- `-vchannel for heavier separated liquid communieating with the outer zone of the bowl and located in said neck portion and extending to an open space above the parer chamber, and an exchangeable regulating disc extending from said neck portion inwardli7 above said space and forming a level outlet for the heavier separated liquid.

GUSTAV HARRY ANDERSSON.

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