US2391110A - Mixing device - Google Patents

Description

Dec. 18,; 1945.

J. L.. WALKER MIXING DEVICE Filedr July 3, 1944 y Fmg;

' INVENTOIL mmol? ATTORNEY.

Patented Dec. 18, 1945i MIXING DEVICE James L. Walker, Baytown, Tex., assignor to Standard Oil Development ration of Delaware Company, a corpo- `Application July 3, 1944, Serial No. 543,306 i'onims. 01. 25a-4) Y The present invention is directed to a device for contactingllluid substances.

More particularly, the prevent invention is directed to a mixing device forV uids which is capable of adjustment forregulating the amount of turbulen-ce produced when the rate of flow of fluid through the device is maintained constant or for maintaining constant the amount of turbulence produced when the rate of now of fluid through the device is variable.

The present invention may be described briefly as a mixing device involving a'shell or body in 4which are arranged anu'mber. of mixing plates with means to alter the position of the plates in the shell and thereby control the number of mixing plates through which theuid being passed through the mixing device is forced to flow. .Y Other objects and advantages of the present invention may be seen from a reading ofthe following description taken with the drawing, in which:

Fig. 1 is an elevation, partly in section, ofone embodiment of the present invention showing the mixing plates all in position to allow bypassing of the plates by lluid owing through the shell, that is, with a minimum pressure drop through the incorporator;

Fig. 2 is aview of the embodiment of Fig. 1 with the position of the plates altered to force the nuid to now through one of the plates;

, Fig. 3 is another view of the same embodiment with the mixing plates'in position to force fluid now through eachV of the plates, that is, in position to cause maximum turbulence;

Fig. 4 is a view of another embodimentof the present invention having a divided flow through the incorporatorto eliminate excess thrust on the shaft carrying the 'mixing plates, and with the mixing plates shown in' position to cause mini# mum turbulencand Y Fig, 5 is another embodiment of the present invention similar to that of Fig. 1, but showing pierced cones substituted for ythe pierced plates for the mixing elements `and with the cones addusted to require flow through all of them; and

Fig. 6 is a fragmentaryhview of another embodiment of mixing elements. v Y v Burning now specically to the drawing, and

rst to Fig. 1, theincorp'orator has a cylindrical shell II, with a plate I2 closing one Vend and a plate-l3 the other end. .An inletline I4 is provided through plate I2 and an outlet line I5 leads from the end of the shell adjacentV plate I3. Within shell YII are arranged spaced bushings I6, I'I,. I8 and I9. These bushings are of proper- 'diameter to have their outer surface contacting snugly with the inner surface of shell VI I. v These bushings are of successively greater width; that is to say, bushing I6 is the narrowest, bushing f I1 is somewhat wider than bushing I6, kbushing kI8 is wider than bushing I'I, and bushing I9 the widest of the group.

Within the incorporator shell is rod 20, coaxial with the shell and maintained in position by guides 2I and 22, which are secured respectively to end plates I2 and I3. End plate I3 is provided with a suitable packing 23 to prevent the leakage of fluidvat this point. The end of the rod extendingfabove end plate I 3 is provided with a screw thread 24 and a keyway 25. Secured to end plate I3 and embracing rod 20 is annulus 26, carrying key 21. A hand Wheel 28 is carried by annulus 26. The arrangementpof the hand wheel, screw thread and key at theend of the incorporato-r allows the rod to bemoved longitudinally respect to the shell II at the option of an operator.

Within shell II and spaced along rod 20 are disks v29, 30, 3l and 32, provided with perforations 9, These disks extend transversely with respect to the incorporator shell and have a diameter slightly less than the inside diameter of bushings I6, Il, I8 and I9. The spacing of the bushings` and the pierced disks is such that as rod 20 is moved, the edges of the disks come in opposition successively with thecorresponding bushings.

In Fig. l, none of the disks is in opposition to 'a bushing, and the fluid passing through the incorporator may ow around each of the mixing disks, so that all the disks may be said to be bypassed by the-fluid, although a relatively small f amount of uid will take a path through the perforations of thev disks. Upon the rotation of hand wheel 28, the disks may be brought into opposition to the bushings, with disk 32` iirst brought into opposition with bushing I'S, then additional disk 3| brought into opposition with I8, then additional disk 30 broughty into oppositionwth bushing I'I, and nally disk 29 brought'into opposition with bushing I6,'to place each diskin the mixingdevice in opposition to its respective bushing. Fig. 2 shows the device adjusted with disk 32 in opposition with bushing I9, while Fig. 3shoWs the device with all` of the disks brought into opposition with their respect/ive bushings. While some turbulence re..

sults when the uids are forced to pass through Y the annular space between the shell and the disks, this turbulence is relatively small compared with through the incorporator. This arrangement rer-V duces or eliminates uid thrust on the rod,v carrying the mixing plates. In this embodiment shelll 4U is provided with an inlet 11|` conducting fluidv into a central portion lof 'the shell, is; provided With outlets 42 and 43 for removing fluid from each end of the shell. The outlets 42 and 43 discharge into conduit 44.

One end of shell 4!) is provided with spaed; bushings corresponding Ito those of Fig. 1 and hence 4given identical numbers, being designated eis-bushings It, I'I, I-8 and I9. The other end of the` mixingshell is provided with bushings spaced awayA from the inlet in the same manner as in the end Apreviously described and hence are designated by numerals I6', Il', I8 and I9. Rod 20' extends longitudinally through the shell and terminates with a threaded end and hand wheel 2 8 to allow theadjusitment of this rod in the same manner that rod 2.9- is adjusted in Fig. 1. Secured 'to rod 29 `are, transversely extending, mixing disks, 29, 3 0, 3| and. 32 arranged to be brought into opposition` respectively with bushings I6, I1., |.8;and I9, and. disks 29.', 33.', 3l and 32 arranged to bev brought in-to opposition with bushings t6',

In the embodiment of Fig. 4 the longitudinal movement of rod 2.0; causes pairs of mixing disks togbe brought. simultaneously into oppositionwith .paire of, bushings. For example, withy theA device adjusted as shown inF-ig. 4, fluidflowing through the incorporator may bypass yall of the mixing disks. Movement of 'the end: of rodl 2D' carryingA screw threadY 2.4. away` from body 40 rstbrings intelongesitionplate.32. witnbushing l- 9 and plate 3525 With; bushing IS".v Continued movement of fred 2.1i brings into Opposition platesA 3.1. and. 3 1" with `buslfiingsu I8 and L8' respectively; then in SiiQGeSSiOri pairs. of mixing plates 30,` and- 30. are bmushi' into.- opnositipn. with bushings, l1. and Il andnlateslfand 29? in Oppositionwith bushings I6 and I6.

Theembodiment ofy Fig. is similar to; that of Fig. lywith-the exception that-the mixing disks have been `replacedby double cones 49, 5U,5 and 52. It willV be understood that this embodiment may befprovidedwith means for moving rod 20 longitudinally including a hand wheel, and screw thread, as are the precedin-gly described embodiments, butin order @to simplify the drawing,rv a showing of such meansl has been omitted from this gure. These cones are yprovided withperforations 5,3, corresponding to perforations 9 of themixing disks previously described. The mixe ing cones of the embodiment of Fig. 5 may be brought intoopposition with corresponding bushingsIB, I1, IB and I9 by movement of the rod 20 in, exactly the. same way as in the embodiments previouslydescribed.

Another arrangement of mixing means is shown in thefragmentary View Fig. 6. In this view-the mixing elements are cones 59., 60,, S-I and` 6,2,vsecuredto rod.2 Il and provided with perforationsS; Thisfassembl'yy of mixing cones maybe arranged inthe.. shell ofanfincorporator in ll exactly the same Way as the pierced plates of the embodiment of Fig. 1 or the pierced double cones of the embodiment of Fig. 5. It will be understood that the number and size of the holes of the elements employed to produce turbulence in mixing may be varied as desired.

It will also be understood that the lastl plate to comein opposition with the bushing in the ad- Lu st mentv of; the, dvicay that plate 29 of the embodiment of Fig. 1, may, if desired, be without perforations When a solid plate of this type is provided, the rate of flow through the incorporaitor may be substantially zero, and in this Way efli- Icient mixing at Very low rates of Huid flow may be obtained. Itv will also lbe evident that While embodiments with bushings I 6, I1, I8 and I9 of differing widths and spacing and plates 29, 3D, 31 and 32- of' equal width and spacing have been shownin :the drawing, an arrangement with bushings IS, I1, I8 and I9 of uniform width and unequal spacingandn with plates 2,9, 39, SI: andv 32 of equal width and` spacingis equivalent thereto. Similarly, the widths-andA spacing ofthe bushings and. .theplates may' be-reversed, and the bushings mayy be uniform in widthand equally spaced, whilethe spaces between the plates are unequal.

It; vvillfbez seen thatA I havel disclosed a. mixing device, which. mayy be positively adjusted by an operator; to give the=desired amount of turbulence to uids being: admixed over a wide range of rate of.. flow; Whilelhayedisclosed specific embodiments ofthe present invention, it Willbealpparent that de tailsof the kdevice maybe altered without departing.- from the scope of. the invention, and itismy intention toA embrace such changes in the hereto appendedclaims.

I claim? l;` A .Contacting device for fluid substancescomprisng, in combination, an elon gatedtubular shell p royidedwithaniinletmeans and,x an outlet means, a plurality of bushings of differing widths spaced in; said shell; between theinlet means. and the Outlet; means, with the outside surfaces of said bnshingsjn CQntact,Wth thee inner surface. of! the shell, arodarnangedingthe shell coaxialztherewith endlpngitudnallymovable from a rst position to a second position, perforated;baies carried. b-y saidgrod, saidbalesbeingequal in number to the bushings int-heg;shell;l and: slidable in. the bushings and; sntedfon thef'rod so; thatwhen therod. is in itsfirstpositionncne; of the-.balilesis adjacent a bushing,but.as therodzismoved: fromits rst to its; secondipositio an4 increasing: numben of the bales is breush 1n; opposition to the bushings.

2.. i-.contacting deviceior iiuids comprisingin Combination. tubular; shell having an. inlet adi a.- centone rend; and.; ana outlet-.adjacent the opposite end,z aL plurralityof bush-ings in; said shell,` said bushings being- Q,f equal inside,v and outside diarnieter and of progressively increasingzwdths. and spaced in; the,` shell;l with thev outside surf aces, in Contact;t with they insidel surface; of: the shell. and with thel distances separating.; adjacent bushings increasing asthe,widthzofjthebushings decreases, a. rod Coaxial withftheshell longitudinally f movable fronra `1i,rstpositioirto;r ag.- second; position, a plurality of perforated; b afliesg, with; a, diameter SlightlyI lessthan the.- insidediameter:off-the bushing ssecured tosaidl rodand, spaced so; thatwhen the.mettais:irlfvherst;positionmo baffle opposesa bushing; butnasth .-rpd. is. m.cvedfromA its nrstrto itsfseondnositionzamincreasing.-numberf"bales iS. @IQg'islvolyfbmughtrin opposition .to the bushlnesi., f Y 3:.:frcmliiautng.davcezfor.lluiclrsubstancescomF prising, in combination,A a tubular shell having the inlet and the first outlet with the distance between adjacent bushings decreasing as the width of the bushings increases from the inlet to the first outlet and with the outer surfaces of the bushings in contact with the inner surface of the shell, a second set of bushings corresponding in number and dimensions to the rst set of bushings spaced in the shell between the inlet and the second outlet with the distance between adjacent bushings decreasing as the width of the bushings increases from the inlet to the second outlet, a rod arranged in the shell coaxial therewith and longitudinally movable from a first to a second position, a iirstand a second set of perforated bailies carried by the rod, said baiiles having a diameter slightly less than the inside diameter of the bushings and slidable therein and spaced along the rod so that when the rod is in its first position none of the baiiles opposes a bushing, but as the rod is moved from its first to its second position the number of the rst set of baffles opposing the rst set of bushings and the number of the second set of baffles opposing the second set of bushings increases progressively and equally.

4. A contacting device comprising, in combina--A tion, an elongated shell defining a longitudinally extending passage including sections of enlarged iiow area and at least two spaced sections of reduced iiow area and an inlet and an outlet separated by said spaced sections of reduced flow area, a rod in the shell parallel with the axis of the passage and movable progressively in a longitudinal direction from an initial pmsition to a second and third position, a first perforated baiile plate mounted on said rod with its periphery defining a boundary tting slidingly within one of said sections of reduced flow Iarea when the rod is in its second and third positions and lying in a section of enlarged flow area when the rod is in its j

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