US2483342A - Cone disk type centrifugal separator bowl - Google Patents

Description

F. J. J. .1. HENRARD CONE DISK TYPE CENTRIFUGAL'SEPARATQR BOWL Filed Sept. 25, 1946 Sept. 27, 1949.

2 Sheets-Sheet l \yw EMT on. Funcmd jemn' osgph Uqhem Hen YMd Patented Sept. 27, 1949 GONE- DISK TYPE CEN-TR'IFUGKL SEPAR'MIOR, BOWL Fernand J can .J osepliJ ulien :Henrand, Remioonrt; Belgium, assi'gnor to Ecremeus'es Melotte,',.Sl!- ciete Anonyme, Remicourt; Belgium, a Belgian c ompany Application-September 25, 1946; Serial=-Nml69.9,-2*12;-. In Belgium October: 5,-,.1.945.:

ZCIai'ms. 1..

My present invention relates to a centrifugal. clarification or separation bowl in which the sediment and purified liquid are evacuated in continuousprocess.

Although. the centrifugal clarification of certain liquids containingv solid or semi-solid particles is possible withthe .known means,.the same thing ol'oesv not apply to the continuous evacuationof' these solid particles. separated. from the. liquidby the centrifugalaction.

Following their separation with the aid of the. known means. suchas ior example a stack of. conical plates, these solidparticles find their way towards the periphery of the centrifugal bowl. wherethey encounter an obstacle to their natural displacement and. on which they accumulate.

This solid or semi-solid sediment cannot therefore reach. the evacuation orifices generallylocated' towards the centre of the bowl and. byimpi'nging against the inner wall of the bowl they accumulate in a mass which, gradually reaches the separating elements, that is to say the conical plates, thus rendering. the latter ineffective. The inner elements of thev bowl thus become. choked, the separation no longer takes place and the clarifier. has. to be. stopped and the bowl cleaned out;

The frequency of. this cleaning operation in.- creases, with the quantityof solid particles con= tained in the liquid to be clarified which. con.- stitute a serious drawback because. the efliciency of the clarifi'er is thus considerably reduced.

Mypresent. invention has for its object. to, remedy this drawback and is. characterised essentially by the fact thatthe internal wall of the bowl is formed of angular faces which con.- verge. towards the. evacuation orifices. in the external wall of the bowl and by the fact. that the inside of the bowl is so designed that it exhibits no surface which through lack of inclination islikely to hold back the heavy particles during their displacement towards the periphery of the bowl.

In carrying the. invention into. practical effect the angular surfaces combine: with the shape of the bowl which consists of an upper and lowerv conefcontacting. at. their bases to form funnels which continuously drain off the separated sub-- stancesitowards. theevacuation orifices provided in the outer wall ofhthebowl.

The. evacuation orifices are formed by very shortgrooves arranged-tangentially in one Of'ther" two contact surfaces of the two halves. of'the: bowl or in both the said contact surfaces.

Breferably the twofhasli-bowls are centred one on the. other meansiof'a flange-provided on the only parts which donotform a-tight joint are' those corresponding to the evacuation orifices.

The accompanying drawings. illustrate how the invention candle carriedinto practical effect.

Fig. 1 shows, in. itsileftl'iand half a sectional view of the howl" and" in. its righthand half an elevation. showing; the. outsideot thev bowl.

Fig 2' is a, view fr0m-above,,.the l'efthand' half being a section andZthe. rightliand. half an external-view.

Fig, 3 is a view showing. a. detailjin vertical section of the methodTofassembling, the upper halfbowl andithe lower. halt-b owli Figs. 4" and'5 are .detailed;views ofa plate form.- ing, part of the stack, the-said plate: being of course illustrated"purely b way of example.

Fig. 6 is. a sectional. view of amodified. embodiment of'abowl.

Fig; '7 isa. sectioniofTajBWel-holder. whichmay advantageously be utilisedas a device for. evacue atingthe muddy liquid.

In the accompanying. drawings, l is. the. tube. through which theliquid'to. be treated is. fed in (followingtlie arrow EST to. the. distributionchainber zformin'g an integrafpartofthe tube, i this chamberis closed at. thatop by contact. with the upper half of the bowl. 3'.- whichis, fitted in the usual manner with... a. suspension ring- 41 the distribution chamber2 are provideddirecting. vanes 5 intendedlto iinpartltb the liquid the same angular rotary motiornas thatv of. thebowl.

Shperiinposed'aroundi tube; 5. is. alarger or smaller number. ofl'conical' plates, 6 (for. example 50) forming. in=known..manner..a stack of plates. In the embodimentillustrated. on- Figur 1, these. conical-v plates.. are, each:- periorated with three'holes T (Figs. 4 and 5) of circular shape which by superposing. the platessformdelivery conduitsv ill-(Fig.1) for: the liquidtim the space enclosed betweenrthaplates The base ot-each com-- in the. chamber Liaguidediihto: the conduits thy shortends ottune lath;

The: plates; 6-= are: centnedi by stacking; them .aroundthertuba t whicmim turn is guidedz. and

Inside 3 centred by its base in the lower half ll of the bowl and at the top by a ring l2 which is secured to the vanes and fits into the cylindrical part I3 integral within the upper half of the bowl.

Below the stack of plates 6 and between the stack and the base ll of the bowl is located a false bottom It provided on the back with a plurality of ribs or projections which converge towards the centre and form conduits l5 closed by two adjacent ribs, the base H of the bowl and the back of the false bottom Ml.

The liquid distributed between the plates is subjected to their separating action, the clarified part of the liquid being the lighteris evacuated through the conduits I5 and reaches the outlet orifices 56 formed in the lower part of the bowl and surrounding and guiding the delivery tube I. A small portion of the light liquid is also evacuated through the conduits formed by the superimposing of recesses ll (Fig. 5) provided on the lower edge of the plates 6 and this portion is delivered to the orifices I6 through an aperture I8 in the false bottom 14.

At 19 is shown the receptacle for the clarified liquid.

On leaving the stack of plates 6, a part of the liquid surcharged with the heavy particles is forced by the centrifugal action towards the periphery of the bowl and towards the outlet orifices 23 for the sludge.

In accordance with the invention the arrangement is such that the liquid charged with heavy particles finds no support during its evacuation against which the solid particles could accumulate until the bowl becomes completely choked.

For that purpose the following arrangement has been devised which permits of evacuating the heavy particles in continuous process.

The lower part or base ll of the bowl is of conical shape as is also the upper part 3 these two cones being joined at'their bases. In this way the heavy particles can reach the periphery of the bowl which is the line of contact between the two cones.

As this separating line is circular the particles would however find a support thereon, even if this part of the bowl were provided with evacuation orifices.

In that case only the heavy particles would find their way during operation in front of these evacuation orifices which must of necessity be small (in the order of magnitude of some 1 6 of a millimetre) To eliminate this defect the lower part H of the bowl is so arranged that the spaces between the outlet orifices 29 are formed by angular portions 2| which with the upper cones 3 and the lower cone ll of the bowl form funnels 22 the outlets of which coincide with grooves 20 of very short length provided tangentially in one of the faces of contact of the two halves of the bowl or inrboth these contact faces. These grooves afford the advantage as compared with holes of small dimensions, of being easy to make and easy to clean.

The angular portions 2! are joined together at il in such a manner as to form an arris taking part in the centring of the stack plates.

The two halves of the bowl are centred one on the other by a flange 23 (Fig. 3) provided on the upper part of the bowl and engaging around the upper peripheral rim of the lower part II of the said bowl. This fiange 23 is recessed (as shown at 24, Fig. 3) opposite to the outlet orifices formed by the recesses 29 which reduces to a minimum the length of the evacuation grooves and permits 4 of minimising the resistance to the flow of the evacuated sludge.

The two halves of the bowl are joined together by bolts 25 which pass through the angular portions 2!. These latter may be integral with the member H or the member 3 or they may consist of separate elements held in position by bolts 25 or again they may be cut on a horizontal plane such as for example at 29 and each of the parts would in that case be integral with the parts 3 and H.

The grooves 20 and 24 are completely unobstructed owing to the absence of a joint consisting of a ring of rubber or analogous material generally provided between the upper half and the lower half of the known bowls. In the embodiment according to the invention, the only places which do not form a tight joint are those corresponding to the evacuation orifices.

The heavy substances accumulate in the casing 25 from which they are evacuated towards the outside at 21.

As will be readily understood the angular portions 2i also determine the angle of downward how or slope of the heavy substances and it is possible to impart to the conical walls 3 or II an angle which is equal to or exceeds the said angle of flow. That is to say, the angular portions 2| have an inclination which corresponds to the angle of fiow or slope of the heavy substances and the conical portions 3 and H are inclined so as to form an angle which is equal or which exceeds th angle of slope of the said substances.

For a given machine, it is only sufficient to modify the inclination of the conical portions 3 or H and that of the angular portions 2| (which can be interchangeable) in order to obtain a continuous evacuation with various materials having different angles of slopes. However the angle which will be chosen will be one suitable for the greatest series of materials.

Thanks to the construction described, the heavy particles separated from the liquid to be clarified can circulate freely in the bowl towards the evacuation orifices without encountering any obstacle.

In the construction described above the outlets for the muddy liquid consist of very short grooves provided tangentially in one of the contact surfaces of the two halves of the bowl or in both the said faces.

The utilisation of these grooves as a means of evacuation may not in practice yield advantageous results in view of the fact that these grooves may be expected to become worn by abrasion and in this way the quantity of muddy liquid evacuated will be increased by dilution.

With a view to maintaining the rate of flow through these orifices constant, the evacuation of the muddy liquid may be effected by means of jewels (rubies, diamonds, etc.) pierced centrally with an accurately gauged hole and which are arranged in orifices provided in the bowl at the apex of the delivery funnels for the muddy liquid.

These jewels may be set directly in the bowl or can be previously set in a circular ring (jewelholder) which is inserted or screwed into the orifice drilled in the upper half or in the lower half of the bowl.

In addition, means may be provided whereby it is possible to replace a jewel-holder set with a jewel of predetermined bore by another jewelholder in which is set a stone having a different central hole.

In Fig. 6 is shown, as in the case of Fig. 1, the tube I through which the liquid to be treated is fed in, 2 the distribution chamber integral with the tube l, 3 the upper half of the bowl, 6 the conical plates forming a stack and H the lower half of the bowl.

According to this modified embodiment of the invention, the outlet of the muddy liquid is effected through jewels 28 (ruby, diamonds, etc.) pierced centrally with a hole 29 of accurately gauged dimensions (Fig. 7).

In the example illustrated, these jewels are set in a jewel-holder 30 having the shape of a circular ring, for example of brass, stainless steel; etc., which is inserted into an orifice 3i drilled in the lower half ll of the bowl opposite to the apex of the delivery funnels for the sludge. This lower half is provided with a flange 32 engaged around the lower peripheral rim of the upper part 3 of the bowl.

The jewel-holder 30 is held in position by a grub screw 33 having notches 34 used for tightening the screw (Fi 7).

To place the jewel-holder in position, it is sufficient to insert it in the orifice 3| and fit the screw 33 in position which is tightened and locked, at the same time ensuring the locking of the jewel-holder 30.

It will be obvious that the jewel-holder may likewise be placed in an orifice provided in the upper part of the bowl opposite to the apex of the funnels delivering the sludge.

As the quantity of muddy liquid passing through the central orifice of the jewels is a function of the diameter of the said central orifice it is sufficient, in order to vary the quantity of muddy liquid expelled from the bowl; to vary the diameter of the bore in the jewels.

As the same are obtainable with different sizes of bore for one and the same external diameter, it will therefore be suflicient to replace the jewelholder 30 fitted with a jewel of given bore by another jewel-holder in which is set a stone having a different central hole.

In other words if the bowl is fitted for example with jewels having a diameter of 0.3 mm. it is possible, in order to increase the quantity of muddy water to be expelled, to fit the same bowl with jewels having a central hole of 0.4, 0.5, 1 mm., 1.5 mm., etc.

The jewels may likewise be set directly in the bowl and in such case it is sufiicient to drill the evacuation orifices provided in the bowl to the exact diameter of the stone and to set the latter permanently therein. This arrangement, however, precludes the possibility of varying the quantity of muddy liquid to be expelled which may, however, differ with the nature of the liquids to be clarified.

In consequence it is of interest to arrange matters in such a manner that the same bowl can be used for liquids of difierent natures or containing different quantities of sludge, by altering the bore of the jewels or by making the jewel-holders interchangeable with the aid of the means described above and illustrated in the drawings.

Irrespective of the arrangement adopted, the jewels retain in use a strictly constant diameter since any wear due to abrasion is practically impossible and the outlet of the evacuation orifices is thus maintained strictl constant.

Another modified embodiment of the bowl shown in the drawings consists in the fact that the assembling bolts 35 for the top 3 and of the bowl (Fig. 6) and the bottom half II are housed into these main parts whereas in the embodiment previously described these bolts emerge at the top of the bowl. This improvement permits of reducing the power absorbed by the bowl in motion.

What I claim is:

1. A centrifugal separating bowl for continuous separation of liquids comprising a casing formed of upper and lower halves of conical shape and being joined along their meeting edges, a feed conduit disposed centrally within said bowl and having a flared extension forming a distribution chamber supported in the upper portion of said bowl, vanes vertically arranged and radially disposed in said distribution chamber to impart rotary motion to the liquid received therein, a pack of frusto-conical discs disposed in said bowl below said distribution chamber and around said feed conduit, said discs being spaced in superposed relationship to one another, ports arranged in said flared extension between said vanes, leading to said discs, each disc of the pack having openings formed therein which constitute substantially vertical conduits when said openings are vertically aligned, said conduits being in communication with said ports and with a discharge opening at the lower end of said bowl; jet discharge openings for heavy bodied material arranged in the periphery of the meeting edges of said casing, angular members having material depositing surfaces arranged within the casing around said discs and adjacent the said discharge openings, the vertical walls of said members cooperating with the casing walls to form funnels converging towards said jet openings, the inwardly extending arris of each of said angular members contacting the outer peripheral edges of said discs, and means passing through said casing halves and said angular members to secure them in assembled relation, said angular members being fixed and immovable with respect to said jet openings.

2. A device according to claim 1 in which the lower half of the casing. slopes uninterruptedly towards a discharge opening surrounding the feed conduit, the angular members being supported and secured on said sloping surface, the securing means comprising bolts.

FERNAND JEAN JOSEPH JULIEN I-lENRARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 499,346 Peck June 13, 1893 1,781,676 Adams Nov. 18, 1930 2,060,239 Peltzer Nov. 10, 1936 2,087,727 Bath July 20, 1937 2,173,580 Fawcett Sept. 19, 1939 2,185,279 Strezynski Jan. 2, 1940 2,209,043 Strezynski July 23, 1940 2,410,313 Strezynski Oct. 29, 19 6 FOREIGN PATENTS Number Country Date 126,603 Australia Feb. 10, 1932 387,298 Great Britain Feb. 2, 1933

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