US1749369A - Centrifugal drier - Google Patents

Description

March 4, 1930.

H. c. BEHR CENTRIFUGAL DRIER Filed Aug. 1928 3 Sheets-Sheet 1 avwwntoz Hans 556/ 351 M Qbtowm March 4, 193D. H. c. BEHR CENTRIFUGAL DRIER F le g- 1928 3 Sheets-Sheet 2 Eiwvemtoz Hans C 56hr Patented Mar. 4, 1930 HANS C. BEHIBI, OF SCARSDALE NEW YORK CENTRIFUGAL DRIER Application filed August 3, 1928. Serial No. 297,234.

- The object of this invention is to provide means for intermittently and automatically.

, supplying to a centrifugal drier a measured quantity ofthe mixture of solids and liquid which it is desired to treat.

To obtain capacity in any given apparatus the measuring chamberjmust be filled and emptiedquickly, and the filling as in my pres; ent device is preferably effected by suction during the operation .of the drier. And its discharge from the measuring chamber to the drier is, for this reason, effected 'by'either compressed air or by steam pressure.

Theidischarge of the dried solids is also preferably performed automatically.

Another object of the inventionis. to assure the unifdrm distributionof the mixture on the screen of the drier so as to keep the rotating system in balance. V

The invention also includes certain novel features of design as applied especially to the 1 self=dischargingtype of drier already in use in a special construction of the baskets, and

parts associated with ituwhic'h include means I for applying fluid pressurelto aid in dislodging the dried solids from the basket, and to thereafter clean its screen surface.

In thedrawings accompanying this application, one practicable embodiment of the invention is shown by way of illustration, in

which drawings- Figure 1 is a central sectional view of the apparatus embodying my invention.

Fig. 2 is a top view of the apparatusshown '5 in Figure 1 Fig. 3 is a detail of a part ofthe inner surface of the basket shown in section in Figure 1. i i

Fig. 1- is a. view partly in elevation and partly in vertical section looking at Figs; 1

i and 2 from the left-hand side.

Fig. -5 is" an enlarged detail of the parts shown in Figure 1 forautomatically timing and controlling the operation of the various parts ofthe apparatus, and a Fig.6 is a detail of a modification of the device for-supplying fluid for. freeing the solid material from the screen.

Thematerial under treatment is fed by mtermittently delivered m'eteu-ed charges to a edges of the ridge members 14.

In the underside offthis annular of the screen rotating basket 10 by means of a continuously rotating-distributor 11 The illustrated form of basket comprises a solid outer wall 12 which is slightly larger at'the top than at the bottom. The inner sur- 5t face of this wall is provided with a series of channels 13 running from the bottom to the top, such channels being located between rows of ridges 14 so located that they are in effect a number of circumferential channels interrupted by thechannels 13. Openings 15 are" provided at the upper portion of the basket member 12. These openings 15 are preferably located out of directline of the travel -of the liquid up the passages 13, they arecfi shown as being located at the upper ends of the rows 14 circumferential ridges.

The screen 16 is disposed inwardly of the basket member 12 and lies against the thin "The bottom of the basket comprises an outer cone 17 to which the basket member 12 is secured, and an'i-nner cone 18, these cones being held together by .a series of connecting ribs 19. The innericon'e 18 is formed integrally with a plate 20having a flatsubstantially horizontal portion-which is bolted to and supported by the head 22 of the driving shaft 23, such shaft having fastenedupon it a pulley 24 driven by means of abelt 25 from some suitable source of power.

An annular cover 26 is secured to an upper flange 27 formed on the basket member 12. coyer 26 a ring 28 is secured fer-holding the upper edge 16.; The. lower edge of the screen being held in place by the upper edge of the outer cone 1? I The shaft 23 is shownmounted in a sleeve or supporting member 29 which is carried by ribs 30 preferablygformed integrally with it and with the framing ring 3]: which is bolted to the floor represented at 32. Ball bearings 33, 34 are mounted at the top and bottom of the sleeve 29, and are mounted upon suitable seats formed onethe shaft 23. A separating or spacing sleeve 35 may be placed around the shaft 23 for engaging the inner races of the. two bearings and for keeping them a proper distance apart. Since the shafting and bearing mountings form no part of this present invention, the details of their 'construction will not be specially enumerated.

Pipes 36 discharge fluid at the appropriate time outwardly of the screen 16 for the purpose of removing the dried material and for cleaning the screen surface. The connection between these pipes 36 and the controller 37,

which is a combined exhaust and compression device, will be described later. 7

The material for treatment is supplied from a mixing chamber 38, the lower portion only being illustrated, in which lower portion a rotary stirrer 39 is illustrated. The blades of this stirrer are free from contact with the bottom walls of the mixing chamber.

.The measuring chamber 40 is alternately subjected to a vacuum'for assuring its rapid filling, and also to pressure for assuring its rapid evacuation by mea-nsof a pipe 41 connecting it with the controller 37. v

The charge of material is preferably drawn ofl from the mixing chamber 38 through an opening 42 communicating with the upper portion of the measuring chamber. This side opening 42 is of some height above .the bottom of the mixing chamber so that any solid,

heavy, foreign matter which may collect at the bottom of the chamber 38 will now. be revented from entering the measuring cham. er. For preventing light, floating material entering, a screen 43 is shown located over the opening 42. The opening 42 is closed seat. i' or the purpose of limiting the range of opening movement of the valve'44, and

1 for keeping it permanently closed if desired,

a set screw 49 is'provided.

The feed tube 50 for the distributor 11 constitutes the lower portion of the measuring chamber. This feed tube is supported by members 51 of the main frame of the machine, and is shown having a flexible or elastic connection 52 with the spout tube of the lower part of the chamber 40. The lower end 53 of the feed tube is shown conical, and is shown closed by means of a downwardly opening conical valve 54 which is reverselyconical. The valve stem 55 is shown guided by -a support 56 and between which and a head 57 on the valve stem is mounted a compression spring 58. Such spring is; of suflicient strength to hold the natural weight of the predetermined charge, but capable of yielding and permitting the valve to open and allow the discharge of the measured charge when the predetermined pressure acts on the surface of the charge.

A float valve 59 is located at the upper portion of the measuring chamber for closing off communication between the' pipe 41 upon the charge reachingthe predetermined height. The valve 60 associated with this float will shut the chamber 40 against suction but will readily yield when pressure is supplied through the'pipe 41.

The feed tube 50'co'nstitutes the mounting or support for the rotary distributor 11-. In the illutsration, the inner race rings of a pair of ball bearings 61 are shown mounted upon the outer port'ion'of the tube 50, these rings being shown spaced by means of a suitable'spaced tube 62. The outerrings of the bearings are mounted in an upwardly extending sleeve 63 formedin the present in-v stance integrally with the body portion of the ditstributor 11. This sleeve 63 is shown carrying a pulley 64 over which runs a belt 65 driven from some suitable source of power.

Upon the application pf pressure either compressed air or steam as the exigencies in carrying out the process may demand, the

material in the measuring chamber .40 ,is caused to press the valve 54, whereupon itis immediately received at the inner edge of the rotating equalizing cone 66, the rotation of which is imparted to the material by frictional contact. The centrifugal force thus imparted to the material, acting against the 'conical surface of cone 66, will cause said material to assume a truly centered surface about the axis of rotation, so that it will be delivered in a sheet of uniform thickness at the outer edge of the likewise truly centered cone 66. The outer flange 67 of cone 66 is bolted against distance pieces 69 on the lower face of the flange 68, which flange is integral with sleeve 63.

The charge as it is driven out centrifugally is equalized, so far as circumferential distribution is concerned,bythe mechanism just described. But-for the purpose of still further distributing this charge equally over the surface of the screen 16 carried by thebasket 12, a double outer cone 70, 700 is provided. These cone members present a V-shaped deflector for the material as it rushes outwardly, and some of the material goes toward the upper part of the basket and some toward the lower part. These cones 7 0, 700 are preferably formed integrally and. are carried by means of an inwardly directed flange 71 which enters slots formed in the distance pieces.

Thatiming of the operating cycle of alternately filling and discharging chamber 40,

.of admitting washwater to the machine and ing through a lateral opening 75 and pipe 76 with a suitable partial vacuum source.

The upper opening 77 of chamber 74 is intermittently closed by the valve 78, which is held to its seat by the pressure of spring 79. When the valve 78 is lifted off its seat vacuum is established in channel 72 and, by its connection 41, in the chamber 40, so that the flap valve 44 is forced open and the mixture to be treated enters to fill chamber 40, as previously explained. 1

'Above the'lower part of the channel 72 invalve chamber 73 is provided the pres- .sure. space 80, and connecting such spaces is the valve port 81, covered by the pressure admission valve '82 held to its seat by the pressure in space 80 and that of the spring 83. When the valve 82 is lifted, pressure is admitted to space 72 and passage 71, onto the top of the mixture inchamber 40, thereby forcing open outlet valve 54 and rapidly discharging the chamber 40. The mixture charge flowing down into the rotating conical basin or rotating equalizing cone 66 has rotation imparted to it by frictional contact, so that it flows outwardly and upwardly. Air or steam pressure is supplied to the space 80 through a pipe 84 from some convenient source.

At the end of the valve chamber 72, adjacent chamber 40, is the water chamber 85 supplied with water under pressure through p1pe86, and communicating through'a port 87 with a chamber 88 beneath, intermittentlv closed off from chamber 85 by a valve 89,

under pressure of water and that of a spring 90. The lifting of't'hevalve 89 admits water to the chamber 88 and out through a pipe 91 and a spray 92 onto the material being treated on the screen 16.

Forming an extension, of the outer end of l the valve chamber 73 and supplied with fluid under pressure through a pipe 93 is another fluid pressure space 94, which in some cases may be simply an extension of the space 80, thus omitting the partition 95. Below the space 94 and communicating with it through a valve port 96 is a space97. The port '96 is intermittently closed a, valve'99 ,under the pressure in the space 94 and that of a spring 98, but the lifting of this valve admits fluid pressure from the space 94 through port 96 and through the pipe line 100,101, 102, 103 and by an expanding chamber 104 forces a the plunger 105 with packing 106 against the lower end of the shaft 23, thereby making a fluid tight connection. Continuing, the pressure fluid'passesthrough the duct system 107, 108, 109, 110 and 36 into the space between basket '19 and screen 16. In

stead of the fluid tight connection through plunger 105 shown in Figure-1, the arrangement shown in Fig. 6 with injection nozzle 111 and conical mouth 112 at the bottom of duct 107 may be used.

The opening of each of the valves 7 8, 82, 89 and 97 is acc mplished through the lifting rods 113, 114,. 1'15- and 116 actuated respectively by cams I17, 118, 119 and 120 fixed on a cam shaft 121 mounted in the bearings 122 and 123, and rotated from some convenient source of power, for instance a pulley 124. These camsare adjusted circu'mferentially to cause lifting of eachv of the valves in proper succession and atthe proper time intervals requiredfor the series of functions of charging, purging, washing and discharging, and such adjustment is made variable to suit conditions, as by the The cams act on the lifting rods generally thrbugh rollers 127 mounted in slots in the blocks 128, the rods being adjustably screwed with their lower ends into the tops of the blocks. The blocks 128 are guided vertically in suitable holes in the'guide bar 129. The upper ends of rods are guided inthe bores of the bonnets'130, 131 and 132 fitted to the lower face of valve chamber 73, which bonnets have stuffing boxes at their lower ends.-

The rod 113 is guided in a stuffing box at the lower end of the vacuum chamber 74.

vWith automatically started and stopped centrifugal driers of the type described the timing of the various operations must necessarily be kept in phase with the speed variations of the driers, and hence the rotation'of the cam shaft 121 must be in fixed relation with the movements of whatever devices are employed for controlling the speed "ariations of the said drier. To accomplish this the rotation of the cam shaft 121 may .be employed to control the movements of such device by electrical, hydraulic or other known methods. 1

A bracket member. 164 is carried by the lower end' of the sleeve housing 29. The lower portion of thismember is chamfered out and closed by means of a plate 165. Mounted in the frame 164 is the loosely fitted centrally bored plunger 105 above described.

The rotation of the mixture distributing system, independently of and at a different rate from that of the intermittent or widely varying rotation of the basket 10 enables equalization and uniform distribltt-ion of theset screws 125 in the hubs 126 of the said cams.

ing period, because then the centrifugal force at the central equalizing basin 66 would not be sufiicient to eftecta satisfactory degree of circumferential equalization of the charge.

With a screen of considerable depth like that of Figure 1 and with.the charge recelved on the screen only at a single narrow zone, or

as in the ordinary centrifugal driers, which,

are generally charged ona closed bottom, high speed during charging would cause so quick an escape of the liquid from the mixture that the latter wouldnot remain sufliciently fluid to distribute itself vertically to any considerable extent.

An advantage of the independently rotate d distributor is that its speed may beadjusted to give the.best results in equalized distribution for various kinds of mixtures.

' Also, with a distributor rotating at a different rate from that of'th'e basket, such differ- "ence, in rotation affords an additional means for correcting any imperfection of circu rn ferential equalization due to possibleincom plete equalization within the distributor.

Rigid with the inner edge of the-base 135 of the curb 136 is the inner cylindrical shell 137, and between this andthe curb 136 is the shell 138, leaving between the latter and the curb the pure liquid basin 139 and between the shells 137 and 138 the dilute liquid basin 140. The upper end of the shell 137 is a little' V below thelevel of the holes 15,. in.the basket 10 and an annular conical deflector 141 in its lowest position rests on the top of the shell 137, and is rigid with a downwardly extending ring 142 fitting loosely inside the top of theshell 138 and ofusuflicient length to remain vsithin'the shell-when the deflector is in its extreme raised position with its'inne'r edge a little above the circle of holes 15 in the basket 1O, asindicated in broken lines. \Vhenthedeflector 141. is in its lowest position the liquid issuing from the holes 15 is projected against the inside of'the curb 136 and flows down into the basin 139, from which it is drawn off through the outlet 143;

i When the deflector 141 is in its highest position, as indicated in broken lines, the liquid rigid with it an opposite arm .153, the end'o f' which is loosel'y pivoted to an arm 155 opposite -to.and rigid with lever 151, so that the ends of levers 150 and 151 must rise and fall together by equal amounts in adjusting the deflector 141. The other levers'148 and 149 will also move in unison with the levers 150 and 151 by the same amount, since they are all rigidly connected .to the same shafts.

Movement is imparted to the system of levers by the rotating cam 156, mounted on the cam shaft 157, acting downwardly on a' roller 158 journalled in an arm 159 opposite to and rigid with lever 148.

The admission of pressure fluid through the system of ducts 160, 36, etc. to the space between the basket 10 and the screen 16 previously described, is effected by a stationary *fluid pressure Iconveying system intermittently and automatically brought into service to inject fluid under moderate pressure into said first named system,

The operation of the apparatus and of the process carried out thereby are as follows: The chamber 40 is filled with a charge of the mixture to be separated during the time occupied by the purging, washingjdrying and discharging periods of the basket '10. The

float, 59 closes the valve .60 and the partial vacuum is compressed to atmosphere by the mixture at the end of the inflow, so that flap valve 46 is closed by the weight 48. Vacuum valve 78 also permitted to close by rotationof its cam 117 Valve 82 is lifted by cam 118 and allows pressure to act through space 72 and pipe bend .41, which pressure,

the surface of the mixture in the chamber 40, forces open the outlet valve 54 and expels the contents of the chamber. The mixture .is thus made to flow down into therotating equalizing basin 66, which, in the manner previously explained, expelsthe mixture in a sheet of uniform thickness into the space between, discs67 and 68, where the ribs 69 further-accelerate itandcause it. to flow out-' wardly and to be split by the flange 71into' two streams, one flowingupwardly over cone 70 and the other downwardly over cone 70, escaping further out ovr the ed es ofrsaid' cones-in two zonal streams, whic thus\,deposit the mixture. circumferentially uniform- 1y onto the screen 16.? During such deposition basket 10 revolves at a very slow rate, just suificient to expel some of the liquid so as to keep the mixtrire'ifrom flowing down b gravity over cone 1?? and. out, but not s5 fast that enough liquid: will be extracted to pre-' lvent' the inixtureflf 'frpm distributing itself ye'rtically to a satisfactory degree over the shrface ofthe screen 16. When charging has ben thus completed, the basket 10 is accelerated up to fullfspeed according to meth- .l torcmg down the float. valve 59 and acting on ods and by devices alreadyin use. The

liquid expelled through screen 16 during the period of purging. flows upwardly through the channels 13and out through the holes 15in the basket 10, shooting out'abov'e the deflector 141 against the inside of the curb 7 8 to be caught in a basin 137 and led away through the outlet 11(1. 1

' suitable degree of purging from pure liquid, a

solid grains is usuallyfurther elimination of liquid adhering to the obtainedby spraying with water. Such a spray is here caused at the proper time by the suitably adjusted cam 120'lifting the valve 89, so that water flowing through the pipe 91 and the spray nozzle 92 is sprayed onto the material left on the screen, diluting and'washingout therefrom the remaining viscous liquid, the dilution like the pure liquid being forced through the screen, then up through channels 13 and out through theholes15 and against the underside of the conical deflector 108, which has been previously raised by the rotation of the cam 126 to the position indicated in broken lines in Figure 1, and which now defleets the solution down into the basin 10? to be drawn off through the outlet 111. The

period of washing having been completed through the closing of valve 89, and a short solids, the basket 10 is sloweddown, preferperiod required forcentrifugal drying of the ably by automatic means, and when a .sufficiently slow speed or entire stoppage has been attained the dried solids are aided in dropping off the screen by pressure fluid admitted behind said screen by the opening of the valve 9.9 as previously described. The measuring chamber 40 havin in the meantime'been again filled, is rea y to deliver a new charge to repeat the cycle of operations as describedin the foregoing.

A number of centrifugal driers, aranged each with means to time and perform auto- -matically the successive tasks constituting the cycle of operations hereinbefore described, may obviously have said means so connected that each of the said tasks, as for example that of charging, wills not occur simultaneously, but in rotation at regulated intervals, thereby equalizing the demand on the power supply for operating the said number of driers.

It is to be understood that the centrifugal machine shown in the drawings, while being the preferred form, is illustrative of my invention and that changesmay'be made within the scope of the claims without departing from the spirit of the invention.

Having described my invention, I claim and desire to secure by Letters Patent:

1. The combination with a centrifugal drier, of means for-intermittently charging such device, and comprising a supply storage reservoir,- a metering chamber communicating with the supply storage reservoir through an inlet, a pressure operated valve controlling such inlet, a valved outlet at the lower portion ofsthe metering chamber, a float controlled valved passage at the top of such chamber affording communication with two alternately and automatically supplied opposite fluid pressure sources, the mechanisin being constructed and adapted to causethe regular alternate filling and discharge'of ber being formed with a tubular downward.

extension, a valved outlet at the lower end of such extension, a float controlled valved passage at the top of such chamber affording communication with two alternately and automatically.supplied opposite fluid pressure sources, the mechanism beingv constructed and adapted to cause the regular alternate filling and discharge of the metering chamber. a

3. In a centrifugal drier for separating liquid from solid material, the combination with a basket adapted to discharge the liquid separated within it at a single zone, of a fixed double concentric receiver for liquid surrounding the basket, a deflecting device, and means for automatically and intermittently raising and lowering such device for directing" separated liquid alternately to the receivers.

4. Ina centrifugal drier for separating liquid from solid material, the combination with a basket adapted to discharge the liq- ,uid separated within it at a single zone, of

liquid -totl1einner of the receivers.

5. In a centrifugal drier for separating liquid from solid material, the combination with a basket adapted to discharge the liquid separated within it at a single zone, means for spraying washing fluid against the material carried by the basket, a fixed double concentric receiver for liquid surrounding the basket, a conical deflecting ring, and means for automatically and intermittently lifting such ring to its upper position for deflecting dilute liquid to the inner one of the concentric receivers, and timed to function in proper relation to. the application of the spray.

6. In a centrifugal drier, the combination with supply means including a downwardly directed spout, a distributor located below such spout and rotating relatively thereto, such distributing means comprising a substantially flat portion at the point of discharge of the spout, an outwardly flared conical chamber leading away from such flat portion, and a pair of outwardly flared cones beyond such flared chamber for separating the discharge into two zones.

7. Ina centrifugal drier, the combination with supply means including a downwardly directed spout, a distributor locatedibelow such spout and rotating relatively thereto, such distributing means. comprising a substantially flat portion at the point of discharge of the spout, an outwardly flared conica'l member rigid with and leading away from such flat portion, and a pair of outw wardly flared cones beyond such flared chamber, for separating the discharge into two zones,

8. In a centrifugal drier, the combination with supply means including, a downwardly directedspout, a distributor located below such spout and rotating relatively thereto, such distributing means comprising a substantially flat portion at the point of dis-.

" charge of the spout, an outwardly flared conical chamber leading away from such flat portion, a pair of outwardly flared cones beyond such flared chamber for separating the discharge into two zones, and a basket adapt ed to rotate at a different speed from the speed of the distributor and located in position for receiving the distributed discharged material;

9. In combination with a centrifugal drier, a metering chamber, a supply-- storage having an inlet into such chamber, such chamber having a spring controlled valve at its discharge capable of yielding upon the combined pressure of the weight of the charge augmented by the pressure fluid upon its surface, there being an opening in the upper part of the chamber, means for alternately exposing the chamber through such opening to reducedpressure and to-inc-reased pressure,'a' valve for closing such opening against suction, and

' a float for closing such valve upon the rise cones beyond such flared chamber for separating the discharge into two zones, and a basket adapted to rotate at a different speed from the speed of the distributor and located in position forreceiving the distributed discharged material.

11. The combination with a storage chamber for'a centrifugal drier, having a curved trough shaped portion at the bottom, of a such metering chamber having a conically formed bottom ext-ending into a tubular formation, the latter having at its bottom a conical valve seat, a conical valve located upon such seat and opening outwardly, and means forclosing such valve, such means being normally strong enough to sustain the weight of" the metered charge, and means for alternately and in timed sequence connecting the port at the upper portion of the metering chamber with low pressure and with high pressure.

12. The combination with a storage chamher for acentrifugal drier, having a curved trough shaped portion at the bottom, of a stirrer in the form of a paddle wheel located in such trough but clearing its walls, a metering chamber having an opening communicating with the storage reservoir above the axis of rotationof the stirring device, there being a screen for covering this opening, a valve for closing the opening constructed and adapted to open upon reduction of pressure within the metering chamber and close upon POSltlVB pressure therein, the chamber having a port in its upper'part, a float valve located in the upper part of the chamber and carrying a valve for pressure against such port, such metering chamber having a conically formed bottom extending into a tubular formation,

the latter having at its bottom a conical valve seat, a conical valve located upon such seat and opening outwardly, and a spring for closing such valve, such spring being normally strong enough to sustain theweight of the metered charge, and means for alternately and in timed sequence connecting the port at the upper portion of the metering chamber with low pressure and with high pressure.

13. The combination with a storage chainber for a" centrifugal drier, of a metering chamber communicating with the storage chamber, means for causing the regular alternate filling-and discharge of the metering chamber, a basket having solid walls except for a row of holes near one end for discharging the liquid in a single zone, the inner surface of the basket being formed with a screen support having channels leading toward the row of discharge holes, means operable in timed sequence with the dischargingof the metering chamber for intermittently rotating the basket, a continuously rotating distributor Within the basket and below the discharge point of the metering chamber, the basket being adapted to rotate at a different speed from the speed ofthe distributor and located in position for receiving the distributed discharged'material, means for spraying'water against the material carried by the basket, a fixed double concentric receiver for liquid surrounding the basket, a conical deflecting concentric rece ring, means for automatically and intermit-' 'tently lifting'snch ring to its'upper position for deflecting liquid to the inner oneof the ivers, and timed to function in proper relation to the applicationof the s ray.'

l. The combination with a storage chamber fora centrifugal drier, of a metering ichamber'communic'ating with the storage face of the basket achamber, abasket for a row of holes ing the liquid in a i rotating the basket, a continuously rotating distributor within the basket and below the discharge point of the metering chamber, the basket being adapted to rotate at a different speed. from the speed of the distributor and located in position for receiving the distributed discharged material, means for spraying water against the material carried by the basket, a fixed double concentric receiver for liquid surrounding the basket, a conical-deing of the metering the discharge point the basket'being adapted to rotate fleeting ring, intermittently position for deflecting dilute liquid to the inner one of the concentric receivers. and time-d to function in proper relation to the application of the spray; i 15. The combination with a storage chamher for a centrifugal drier, of a metering chamber communigting with the storage chambermeans for causing -the regular alternate filling and discharge chamber, a basket having solid walls except for a row of holes near one end for dischargmg the liquid in a single zone, the inner surface of the basket being formed with a screen support having channels-sloping outwardly towardthe'row of discharge holes, means operable 1n timedlsequence with the dischargchamber for intermittently rotating the basket, a continuously rotating distributor, within the basket and below at a different speed from the speed of the distributor and located in position for receiving the distributedf discharged material, means for spraying water against the material carrled means for automatically and lifting such ring to its upper of the metering of the metering chamber,

by the basket, a fixed double concentric receiver for liquid surrounding the basket, a conical deflecting ring, means forautomatically and intermittentlyliftingsuch rrngto its upper position for deflecting dilute liquid to the inner one of the concentric receivers, and timed to function in proper relation to the application of the s ray, and means timed to thereafter admit fluid under pressure between the basket and the screen for freeing the solid material -from the screen.

16. The combination with a storage chamber for acentrifugal drier, of a metering chamber communicating with the storage chamber means for causing the regular alternate filling and discharge of the metering chamber, a basket having solid walls except for arow of holes near one end for discharging the liquid in a single zone, the inner surface of the basket being formed with a screen suppbrt having channels sloping outwardly toward the row of discharge holes, means operable in timed sequence with the discharging of the metering chamber for intermittently rotating the basket, a continuously rotating distributor Within the basket and below the discharge point of the metering chamber, the basket being adapted to rotate at a different speed from the speed of the distributor and located in position for receiving the distributed discharged material, a fixed double concentric receiver for liquid surrounding the basket, a conical deflecting ring, means for automatically and intermittently lifting such ring to its upper position for deflecting liquid to the inner one of the concentric receiver's, and means timed to admit fluid under pressure between the basket and the screen for freeing the solid material from the screen.

, 17. I with a there n a centrifugal drier, the combination basket, a screen carried by the basket, eing passages provided between the screen and basket, and means for intermittently rotating the basket, of means timed for admitting fluid under pressure to such passages upon the cessation of the rotation of the basket.

18. In a centrifugal drier, the combination with a basket, a screen carried by the basket, there being passages provided between the screen and basket,and means for intermittently rotating'the basket at a speed sufliciently high to centrifugally urge the material outwardly against the screen and slowing down the speed to relieve such outward centrifugal urge, of means timed for admitting fluid under pressure to such passages upon the slowing down'of the speed of the rotation of the basket;

19. The combination with a storage chamber for a centrifugal drier, of a basket having solid Walls except for a row of holes near one end for discharging the liquid ina single zone, the inner surface of the basket being formed-gwith a screen support having chanfor deflecting'dilute liquid to the inner one of the concentric receivers, and timed to function in proper relation to the application of the spray' 20. The combination with a storage chamber for a centrifugal drier, of a basket havingv solid walls except for a row of holes near one end for discharging the li uid in a single zone, the innersurface of,.the' basket being formed with a screen support having channels sloping outwardly toward the row of 22. In a centrifugal drier, the combination with a basket, a screen carried by the basket,

there being passages provided between the.

screen and basket, a shaft supporting the basket, and means for intermittently rotating the shaft, ofmeans timed for admitting fluid under pressure to such passages upon the cessation of the rotation of the basketand comprising a fluid conduit leading from a source of supply to such passages, the shaft being formed with a bore constituting a part of the fluid conduit, an expansion chamber open to the pressure of fluid inthe conduit, and a plunger having a bore constituting a part of the fluid conduit, controlled by theexpansion chamber and constructed and adapted to engage the end of the shaft upon rise 'of pres-' sure in the expansion chamber and complete the conduit "and to be freed from the shaft end upon fall of pressure in such chamber. Signed at New York, N. Y., this first day of August, 1928.

a v HANS C. BEHR.

discharge holes, means for intermittently r0 tating the basket, a continuously rotating distributor within the basket, the basket being adapted to rotate at adifferent speed from the speed of the distributor and located'in position for receiving the distributed discharged material, means for spraying water against the materialcarried by the basket,

a fixed double concentric receiver for liquid surrounding the basket, a' conical deflecting I ring, means for automaticallyand intermittently lifting such ring to its upper position for deflecting dilute liquid to the inner one of the concentric receivers, and timed tovfunction in proper relation to the application of the spray, and means timed to thereafter admit fluid under pressure betweenthe basket and the screen for freeing the solid material from the screen.

21. The combination with a storage chamsolid walls except for a row of holes near one endcfor discharging the liquidin a single zone, the inner surface of the basket being formed with a screen support having channels sloping outwardly toward the row of discharge holes, means for intermittently rotating the basket, a continuously rotating disv tributor within the basket, the basket being adapted to rotate at a diflerent speed from the speed of the distributor and located in position for receiving the distributed discharged material, a fixed double concentric receiver for liquid surrounding the basket, a conical deflecting ring, means for automatically and intermittently lifting such .ring to its upper position'for deflecting liquid to the inner one her for a centrifugal drier, of a basket having v of the concentric receivers, and means timed to admit fluid underpressure between the basket and the screen for freeing the solid 65 material from the screen.

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