US902913A - Liner for centrifugal liquid-separators. - Google Patents

Description

J. V. M. RISBERG.

LINER Pon GBNTRIFUGAL LIQUID BEPARATOBS.

APPLICATION FILED IBB. 16. 1906.

Patented Nov. 3, 1908.

2 SHEETS-SHEET 1.

J. V. M. RISBERG.

LINER FOB. UENTRIFUGAL LIQUID SEPARATORS.

APPLIUATION rum] 11:13.16. 1906.

902,91 3. Patented Nov. 3, 190s.

2 SHEETS-SHEET 2.

UNITED STATES GFFICE.

JOHANNES VALDEMAR MRTEN BISBERG, OF SDIGRTELJE, SWEDEN, ASSIGNOR ',i() AKTIEBOLAGET BALTIC-SEPARATOB, 0F STOCKHOLM, SWEDEN.

LINER FOR CENTRIFUGAL LIQUID-SEPARATORS.

Application filed February 16, 1906.

T o all whom it may; concern.'

Be it known that I, JOUANNES VALDEMAR MRTEN RIsBERG, a subject of the King of Sweden,residing at Sdertelje, in the Kingdom of Sweden, have invented new and useful Improvements in Liners for Centrifugal Liquid-Separatore, of which the following is a specification.

Among means used in centrifugal liquid separator drums for increasing the effect the most general one consists 1n funnel like plates, inserted into each other and dividing the contents of the drum (as for instance milk) into layers thin in radial direction in. the well known manner. The skimming operation or the separating of the fatty globules from the milk serum is effected in the said thin milk layers in such manner, that the globules, being lighter than the said serum, are forced inward toward the center of the drum along the upper surface of the plates, while the heavier serum is forced outward toward the peripher of the drum owing to the continual supp y of full milk to the drum. The separation of the fatty globules is effected more speedily the shorter the distance is between the plates, and it is possible, by providing sufficiently thin layers, to extract a great part of theV very smallest fatty globules, difficult to separate owingv to the comparatively great friction,

, to which they are subjected.

As learned from the practice, however, one may not proceed too far on this way, as the distance between the plates cannot be below a certain minimum without the effect being decreased, owing to the fact that the blue milk particles will run outward with such a great force, that they counteract by friction the movement of the fatty globules in the opposite direction. This invention has for its object to reduce the frictiomsurfaces between the two liquid currents by a special construction of the conical plates, so t at the distance between the plates can be reduced below the said minimum Without the stronger liquid-currents, resulting therefrom, counteracting the movement of the fatty globules toward the center ofthe drum. Forces acting upon the fatty globules will move the same toward the center but not directly along the projection of the radius on the upper side of the plate, as one may think, but in a curved line, forming the resultant of two different forces, viz. the centrifugal Specification of Letters Patent.

Patented Nov. 3, 1908.

Serial No. 301,490.

force acting along the radius vector, and the inertia of the fatty globules, acting in such manner, that the fatty globules, when moving inward toward the center, tend to etai n the movement in the linear or peripheral direction, in which they were moving when in the starting-point of the inward motion. As the velocit in the peripheral direction is greater at t e periphery of the drum than at points situated nearer to the center of the same, the fatty globules,`moving toward the center, will have at each point a peripheral velocity, which, owing to their inertia, is greater than the actual peripheral velocity of each point, owing to which fact the globules do not follow the radius vector from the starting point but deviate from the said radius in the rotary direction, the deviation increasing toward the center in such a man- Iier, that the globules are moving in a )ein more or less spiral in shape. In fact, iowever, the fatty globules are not able to perform the said movement in an undisturbed manner in liners consisting of conical plates ofthe construction hitherto used, which fact is substantiall due to the continual supply of the full mil According 'to this invention the conical plates are so constructed, that the cream currents, owing to the said movement of the fatty globules, are directed to certain comartments, which are not disturbed by the ull milk continually running into the liner.

In the accompanying drawings Figure `l is a vertical section of a liner arranged in accordance with this invention (only a few plates are shown). Fig. 2 is a plan view of a plate. Fig. 3 is a vertical section of a modified form of the invention. Fig. 4 is a plan view of one of the plates shown in Fig. 3. Fig. 5 is a section on the line A-B of Fig. 3. Fi rs. 6 and 7 are plan views of two other modi cations.

For the purpose stated above the plates are provided with radial interposed pieces e Figs. 1 and 2, extending from or substantia ly from the central opening of the plate to the eriphery, consequently over the whole skimmin surface. x, Fig. 2, may indieate a fatty g obule, which is on the point of being separated from a milk layer between the lates. The said globule is forced to war force acting upon the milk, but as the said globule acted upon by its -inertia. at the same the center owing to the centrifugal time tends to retain a peripheral velocity, which is reater than that of the neighboring parts of t e plate, as stated above, the globule will move in the direction indicated by the arrow at m, provided that the drum is rotated clockwise. Owing to this fact the globules will gather at the rear side l) of the ieces or ribs a and move along the same inward toward the center.

The blue milk particles, on the other hand, are also subjected to the action of the centrifugal force and the inertia. The centrifugal force forces the same outward toward the periphery, owing to their greater speciiic weight, and owing to'their inertia they tend to retaln their initial peripheral velocity. As the said particles are moving from points with less peripheral velocity toward points with greater velocity, they will, contrary to the fatty globules, slide' backward on the plates and consequently move in a direction opposite to that of the fatty globules i. e. opposite to that indicated by the arrow at Owing to this fact a current of blue milk will move toward the periphery along the iront side d of the ribs a, Consequentl the spaces between the plates are divided y the ribs into compartments, some ones for the cream and other ones for the blue milk. In order to avoid collision between the cream currents and the full milk entering the liner, the latter is led into the spaces between the plates through openings e, provided in the arts of the neutral zone, which are situated Just in front of the ribs a with regard tothe rotary direction. Owing to currents caused by the ribs the neutral zone, which in liners before known consists of a c lindrical layer will have the shape indicate by the dotted lines c. Consequently the full milk is introduced at points of the neutral zone situated nearest to the center. The distance of the neutral zone from the center, however, changes owing to certain variable agents and for that reason the openings e must be made sufficiently great radially and may, advantageously, have the same length as the ribs a. In such case the plates are preferably arranged as shown in Figs. 3 and 4. The plate strips f resulting from the providing of theopenlngs e are folded along the edges, cohermg with the plate cone, outward or inward in such a manner, that the bear against the outer or inner side respectively of the cone and form the ribs or interposed pieces a, as shown in Fig. 5.

The interposed pieces or ribs a, may be rovided in many other ways as for instance by projections formed in the plate by ressing, as readily understood by those skil ed in the art. The ribs may have other directions than the radial one without their action being substantially changed. Thus in Figs. 6 and 7 lates are shown having ribs a, extending 1n an oblique or spiral direction.

Havlng now described my invention, what I claim as new and desire to secure by Letters Patent is:

In liners for centrifugal separators, the combination with conical plates arranged one within the other, of ribs a extending substantially from the central openin s of the plates toward their eripheries an located substantially above t e ribs of the next subjacent plate through the whole set of plates and having a height equal to the distance between the plates, so that the spaces between the plates are divided into separated cells, and inlet o enings e for the said cells, located immeiately in front of the ribs forming the rea'r partition walls of the cells with re ation to the rotary direction.

. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHANNES VALDEMAR MRTEN RISBERG.

Witnesses:

CARL FRIBERG, ROBERT APELGREN.

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