US841370A - Centrifugal separator. - Google Patents

Description

PATENTED JAN'. 15, 1907.

. s. BOK.

N GENTRITfIGAL SEPARATOR.

APPLICATION FILED JAN. '7, 1905.

"wifne's ses' PATENTED JAN. 15, .1907.

N. s'. BUK. CENTRIPUGAL SEPARATOR.

APPLICATION FILED chum, 19 5.

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N. s. BUK. UENTRIFUGAL SEPARATOR.

APPLICATION FILED JAN- 7, 1905.

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S e S .5 0L n rrnrrnn srarns earner enrich NlLS SVENSSON Bilii, O1 STOUKHOLM. SWEDEN.

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Specification of Letters Patent.

Patented Jan. 15, 1907.

Application filed January 7,1905. Serial No. 240.111.

spaces in which the separation process wholly or partly takes lace. The object the invention is to introduce the full-milk into the said separating-spaces of the liner in such manner that such inportions of the liquid to be, separated wil be distributed to the said spaces as correspond to their separatin power soas to obtain the highest possible e ciency of the separator.

The invention is especially applicable to the so-called alpha Laval separators, the.

distributing means of which-heretofore used are, as trials have proved, unsatisfactory.

The method of introducing the liquid to be separated into the thin spaces between the lat'es of the liner is, accordin to the present invention, that the liquidto he separated is compelled to pass at suitable speed through one or more, principally axially running, channels the liquid containi cross-sections of which are diminishing in t e direction of the flow of liquid, the .side of the said channel or channels facing the edges of the liner being open. The liquid to be separated will thereby be compelled to flowout between edges of the plates of the liner that are placed suiiiciently near to the open side of the said channels and forming inlet-openin set theseparating-spaces. The latter wilv each receive a certain quantity of the liquid to be separated from the part of the channel situated between the two sections of the channel, the

lanes of which run through each oftwo adacent edges of plates. -By determining the average speeds in each of the said sections and thedecrease of the onesectionin relation to the foregoing the quantity of liquid introduced into the corresponding separatingspace may be determined.

'- The energyof translation which the liquid to be separated has while flowing axiall in thesaid distributing channel or channe s is partly transferred into pressure in the parts of theliquid received by the inlet-openings, and the; said pressure or overpressure over the static centrifugal pressure in the said openings will cause the introduction of the liquid into the respective separating-spaces.

in the accompanying drawings 1 have shown a number of devices embodying my invention.

Figure 1 shows a central vertical section of one constructional form of my invention. Fig 2 shows a horizontal section online A B in s ig. l.

Fig. 8 shows a central vertical section of a second constructional form, and Fig. 4 a horizontal section on line C D 1n Fig. 3. Fig. 5 shows a central vertical section of a third constructional form, and Fig. 6a horizcn't'al section on line E F 111 Fig. 5. Fig. '7

showsa central vertical section of a fourth constructional form, and Fig. 8 ahorizontal section on line G H in Fig. 7.

lake reference characters indicate same or corresponding parts throughout all the figures.

Referring to Figs.-'1 and 2, a fluid-leading device 1 is provided in the neck of the bowl A',i the said device 1 having in its lower part outlet-channels 2, opening into corresponding channelsB, provided in the central pipe 10. The said channels 3 are continued by distributing-channels 0 en at the sides facing the circumference or" t e bowl and having their walls facing the axis of the bowl inclined in such manner that the cross-sections of the said channels 4 decrease in the direction of flow, here downward. The edges of the :side Walls 6 of the said channels l bear against the edges 8 of the plates 7, engaging in the usual manner by means of notches the walls 6, While the inner edges 9 of the plates 7 are at such distance from the wall of thecentral pipe 10 as to leave passages for the separated cream. By giving the channels 1, 2, 3, and 4 suitable cross-sections it will be possible to have the full-milk let into the channel or channels 4 at such a speed that the energy of translation of the quantities of full-milk, detached by the edges 8 at a suitable angleu, transferred into pressure will cause the entranceand distribution of the quantities of full-milk simultaneously in all the spaces between the plates 7 of the liner. By this means a compulsory and, on account thereof, reliable distribution of the full-milk in all the separating-spaces will be obtained.

Referring to Figs. 3 and 4, the bowl is provided with a usual central pipe 10', communicating at .the lower end with a usual slime-cup 13. From the latter lead oblique IIO .lists'sustaining the outer edges of the plates of the liner. The full-milk let into the upper end 1 of the central pipe falls down into .theslime-cup '13 and flows therefrom,

' through the channels 2 and the outletmouths ,3, into the distributings'channels 4,

'jithe cross-sections of which decrease in the direction of flow+-.viz., upward. The edges 8 of the plates strike the upward-flowing full-milk at .a suitable angle a, and the fullmilk will also in case be compelled to distribute itself uniformly in all'the separating-spaces between the, plates of the liner. The. flanges'12, projecting from the central pipe 10, serve only to' sustain the inner. edges of the plates 7.

' Figs. 5 and 6 illustrate the application of my invention to a well-known so-called al pha Laval separating-bowl The usual central pipe 10, which at the lower end communicates with a slime-cup 13, is provided with radially-projecting flanges 5, in which my improved distributing-channels 4 are provided, the said channels 4 communicating with the slime-cup 13 by orifices 2 in the upper part of the latter. The inner edges of the plates 7 bearing against the sides of the channels 4 are preferably bent in such manner that the angle a of the edges 8 and!) of the plates 7 in relation to the direction of flow in the said channels 4 are more suitable than the angle fl formed by the generat-rix of the cones with the said direction of flow when the inner edges of the plates are not bent in the said manner. By using a suitable angle a successive tangential spreading of the full-milk within the thin separating-spaces will be obtained, while an unsuitable angle [5 causes an abrupt and violent tangential spreading close to the edges 6 of the sides of the channels 4 in disturbing proximity to the cream between the edges 9 of the plates and the outer surface of the central pipe 10. By

bending the plates of the liner at a suitable distance from the'edges 6 the zone is determined in which the most effective spreading of the full-milk will take lace. The full-milk let into the top end} .0 thecentral pipe 10 will, as usual, fall down into the slime-cup and thereupon rise through the orifices 2 into the distributing-channels 4, from which the full-milk will uniformly enter all the separating-spaces between the plates 7.

In the constructional forms described above the tapering distributing-channels 4 have parallel sides 6, so that the side opening of such a channel facing ,the edges 8 of the plates 7 is of one and the 'same tangential width along thev whole height of the chane nel, and the decrease of the cross-sections is only due to the inclination of the Wall facing the axis of rotation. It is, however, possible, as is shown in Figs. 7 and 8, to make the ra-' dial extension of the said distributing-channels constant if the sides of the latter bearing against the edges of the plates 7 are so arranged that they conver e in the direction of the flow. In such case t e wall 5, facing the Fig. 7) in the high speed of rotation used in centrifugal separators is so great that all the surface elements of the liquid, while the liquid fully partakes in the rotation, are approximately at one and the same. radial distance from the axis of rotation independent of the speeds at which the liquid flows in axial. direction at least within certain limits of the axial speed. The said channels 4-may therefore have the appearance-shown in the lower part .of Fig. 8. With respect to the strength of the central'pipe 10 the said inner wall may preferably, however, only partly be dis ensed'with.

aving now articularly described my invention, what claim as new, and desire to secure by Letters Patent, is

The combination with a separating-bowl having a liner therein'consisting of superposed, conical-plates, of a distributing-channel extending axiall along the edges of the liner-plates and uno structed at its side toward theliner and having itsv cross-section decreased in the direction of its length and too

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