AU625808B2 - Dual suction vertical pump with pendant auger - Google Patents

Description

AUSTRALIA

Patents Act cn RP Col 253IICTI08 t (OIGIN4AL) Application Number sts rt Ja Lodgedt Accepted; Pub!lhd AolatfW Arts ANPt4IcAW'S REFE~CKE 1247/W 3900 86dex Lojfl Texa 77027, UNITMf STWS OP NMIPtCAt Addretz fo W-g s "O*P OW EAI,%A C *V.i Conplote pecifiction for thq invorantio4r nt2LdI POF Codoi 43783/71-477 Thea f~lrin S~tn nt iS 4, full dsiptioi of thim iventioIn) 4ncludlor, tile best methid of ParrotoiIfl it kilovi to QppI tit(*)t -1- DUAL SUCTXON VORTICAL PU4P WITf PENDANT AUGER 04*i! ThI, invention relates to vertia11yorieitedf centrifgud, sub~mered, Slurry pumps, Bftefl. Vet c4loly-orionted p n4litr;fugat, slurry pu~mps have been used etfectIvely In slurry tenrips for qN4te some time. Both single suctIon and dual c;t1-l pumps have been utilized. A O4a1 suotion puMP Of a Qonventflonal submerged type is illustrated In VIQ, as a, pror art deoviQq.

These da:I, suction poMps, especially of the type $V11statd in FIG. It are Pub'nerqec pumps havinq gn elonqated veriaal shaft whioh dives a pump impeller by a remiote mnotor loCated above the aSryo In a y&i.a5 CIaIA Ouot~jon -Ubffefed pump, no boain4ngs are exposed or located I$ belOW the slurry level. Thq0 vertical pumips hove boon 04 Used to pump slurries redlti ngfom coal ple runoff 6: 66 floor Washdown, lime mud, fly a-h, Industrial waste tra nsfer, pic~lin/patinq saoutionfl Mill scalo, pulp and ae0 Mpill iqu1 ids, znft a ke. Th eantilever shaft 0 0 0 2 dosign permits bnearnns Nott4s t etQ to bq rotM~t ftro (11Y, R~ecently, Suftord PUMP-' In whtoh the Motbr 1114 the pumnp ore constzruotad ats a compactt, a1bmer ,ad untit haivo doen intcdrocd as slurry ipuo Pumps of this type have 2 Wen used froutey in i In drdging oporationo and ,,ie ilustrated In the following VS.~ paitentst 4,456?424 to Arnaoka, 4,650,342 to Goodin 416040035 to Robortt 4 374 1531 to Chaply gin, at a 3 973& t066: to V augha n :uni itehe patanto general ly late to a ontlrtri.-k pump wit an ciuger locantd below n ingl, dowrdly 4. 4 0 d ctod pum pInlat, TVhei atujr may tunction o±ghtl diffeently in thaG various doeVicoi Por exnmplot in Arao)kf th' ztUqar is Intonded to (rloct liquid Away from the Pum and. aqltate v Xidw much ail oand located in, a yri'Vo bad, Tn dontroot, tho 40vIce ot 0oodwin iz i r L 1

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-2structured to force liquid-containing solids axially towards the pump impeller. The Chap:ygin patent disclose$ a device having a canopy which deflects liquid flow downward to then be suo1ed upwards through the lower Inlet of a single inlet pump, The Vaughan device is one which a chopping bloda is placed underneath a single Inlet pump to prevent large agglomerates from entering the pump csing A disadvantage of auger equipped submersible ,0 pumps having a sinelj Inlet proximate the atUgor is that the agitating action Pf the auger combined with the suction action of, the Irapoller tends, to oroate a somewhat localizedt affect i Vor dredging oerationg In a Very largeo body of water, e a river, in which the Whole purpoze of the activity is to r~oev solids troi tho lbottom, such localized action riot only may be radily talertd, but 4 may a actually desired. flowever, in a ves3se cntaining a slurry it s usually scired hat the slurry particle!3 #00 bo gubgtontial ly uniformly distributed throughout the gG slurry. Thus, miore than moro localized hydro~ulic lo1wn 4re deired in a slurry tanJ 1 For example, if hydraulic 1 flow is localized In a slurry tark, th slury partol may not sfay in wiit~pn4Qsin at pQinto, romotio troni tho sito 6* or th agitation action. k 2 13 in pumps, of tQs nsi snq nle ttyp which Ar I ncwn in the prior art, a further d1iava,1ntagQ reids III tho fact that theso pimps genoraly r.oicuiro %ubm=*rq soa3l and 1bearinga 44 tiG. i. is an 0e1pational view a sir S Sdual 0S uctln, vrtio y -orioentd, vb*Vd Ourry pump having at remto mot or.

VXG

4 2 ual seut~ion Oubmorqed Oontriftigal UMP Yimote motor Arid a d endent aitator Tt (W,9 The present invention provides a veitically orientedel submerged centrifugal slurry pump comprising: a dual inlet pump housing having an upper Inlet and a lower Inlet; a dual suction impeller having a central disk, said central disk having a pair: of opposeI faces and impeller vanes defined on each face of said central disk, $aid impeller being mounted within said dual inlet pump housing; a pump motor pQ5itinedl remote from said pump husng; means to support said pump mt'or an elongated vertical drive shaft connecting said mOor to said dual suction Impeller, said dual suotton Impeller' being attohed to a free end of said drivo shaft; moans to supgpQr said pump houtsing; a stub shaft depending from. and. secued ax'illy to said dual suction Impellr) an aitge q je Mont attahod, to the lower end of kiaW stub shaft; and I aa cylindrical strainer roaqo attachod over the lower Piunop Inlet, said cage having oponingq therein smaller than a* othe Internal clearance of soid dual sution impeller, Vie present invention also provides a ptroifit Agitator kit for retrofitting t, a dual inlet, submvrtQC! 2$ pump having a remot e unSubmergel tnotor, a vertical drive shaft an d a Vunp huS9in having a n upper inlet *4*eicn~eenilabovt said vo tioa3 drive Nhatt do a a **0o I inlet, saidI retrotj W Sgtaur kit cornSt, ',1111 4 vig a pa~r o~ iaa threadPed 0 bote 6 In centraSlly poiltiloned upper and lowor hubs, said too*##e in sad iupper hUb siead to 00CePt a threaded male ond of the vertical drive zhBt, said bore ot the lowor huh threaded and ed, to apU a Lh~hr(ded~ dependent turb a stu- thhaft the~adod on both Onds, one cnd %Izod an4t) threaded to fit in a threaded borm oC the lowor hub of onid impler and tho othor (arid udapted to conrieot seoureoy to an 69itatsor; an itltor having a plauroll'4i of vanto angled, aucih 2959L that upon rotation of said agitator, fluid in contact with said agitator Is directed down~wardly and outwardy; and a Qage-Itie cylindrical strainer having openings therein which are smaller than the space bgetween adjacent vanes$ o said Impollert The present Invention further provides a tankmontedf motor-adiven vorticslly-oriented submerged, centritugal slurry pump conpristngt a dual stuction i e3'1er having a central dts1% said central disk having a pair of opposed facog and impeller vanes mounted on eaoh said Iicp of said central disk dual inlet, earngless gurp housin~ having an upper inlot and a lower inleot said dual inlet boariftngqlss pump housing having said dual tucton impeller mounted therein) a pump motor positioned romote rom ai dual-inlet, borigloss pump housing; mounting means to moun said pump Motor toa onritining tank above a igquiqd level of sai AicIjiuia contoinIng tank; a elonqed, pendant vattical drive shaft connecteO at itti Iwper end to said rump motor and 4t ft:4 tqowr, fr e I I Il end to said dual suctlion Impoller moons to support said pu h o it s n A; A cylindrioal strainer ge tach over tho lower inlt, said cage having openings therein smaller than the Mi$i11mu sace )bstwee adjacent vane~ of said dual suction IMPralra And having an and plate member having a central poning alignoa with said p(ndant vrtical drive ohaCt, siaid end plate. mrnnhor di placed dnwardly troti naid lot4q1 a otub shaft opeonding from auid zeurod sixally at tS uPPEr Ond to MAW dual SuctiOn iMO ll r and exencing 3t NroUgh said end Plato momber; and an &uer eement attached over thelw 10r fren nd ot asid stub zhObt externally to is~id end plate mba or, The fllowing d oiption refers in more detall. to Sth@ vorloum ecaures cf e p~roznt ineantio-tl, XO, 44 59 L 4

IIS

facilitate an understanding of the invention, reference is made in the description to the accompanying drawings where the present invention is illustrated n a preferred embodiment. Tt is to be understood that the present invention is not 1,inmlted to the preferred embodiment a, illlustrated in the draw'ings, FMG., I is an elevatiqnal view of a prior at dual, suction, vertiooa3ly-oQirntedt submeorged slurry pump having a remote motor, FX(, az is a dial Fjtilon submerged contrifgqaJ ump having a remote motor and a dependent agitator axially attached beneath the Impeller, Tn Figure an oelovatdonal, partial soeotina1, view of the doublo. suction submerged centrifugal pump is lutratod A drive haOht 10 is connected io a: remolte Motor (not shown) and is anQcIrd at its upper d n a beating moun'n (not Shown) and attached at its 1QWoZ end an impeller 11, (The motor rnountInq and supprt Vlate for the p ump of flg: Z may be the so simi~ar to that t-0 l u r a t ed i n V I C T h e i mr p e l l r 1 1 i a d u a l a O t i ng Im~ella r with a solid., thin, disk-k1; cente,' 12 with Propulsion vanes 13 And 14 on ths top andc bttgm faces of tEtto the impelee disk, The Lipper portion of the puimp aparatus of tho instant inention li similar to that shown in FIG, 3 with II the :stport plate borinq hotisnsg and motor being *4t to tow 9 14 41~ i

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*49* 9, g 4444* #4 4 '4 4* 4 *~4 4* 4*44 4+ 9 .4O .420 similarly situated, Thus, those items not, Iltustrated in FIG. 2 may generally be viewed on FIG, 1.

The impeller is housed within a centr fuqja pump housing 15 whIch is fixed in place and supported by a pump mounting column 16 which is preferably a large, annular pipe which Is fastened at its Upper end to the motor mounting support (not shown) and at Its lower end to the upper sutface of the centrifugal pump holusing.

inasmuch as the pump is a dual suction pump with an upp%-W inlet 17, the support column 16 has openings through it in the vicinity of the upper Inlet opening 1.7, The oentrifugal pump housing also has a wot opening at location The centrifugjal pump housing is is gonerally' located from about two toot to about six toet below a motor support plate (not shown) A motor support Plate such as that shown ini FXGQ 1. Is a practicable Bcans for supporting the motor ana by elongatedl dopondiniq oboers for supporting the Vp mp housing 20 The dIrive shaft 10 is hOUsed, qdneralY concntricayll, Within the annuolw pump suport column 16# Generally, the diameter of the drive shaft is only about one-half of, the inzide diam6eter of tha suport colun,.

The Inside diametor of the support tobor is usuall.y as 2$ lairgo or sligjhtly ltir than tho damoa4e of the uppor inle t opening of, the pum1p. A flange around the lower on4 of the support column mates with d circular band around the upper inlet opening and the flang~e is boltod to the pump housing. The drive shaft genevally haw a short 30 section near its lower and which has a reduced diaatQer.

For stability purposies, most of the drive shaft 16 fairly thick with a short section which pamsse through the upper inlet of a diamotor which io tabout one-half as thick am the long, upper portion of tha zhaft.

1\lthough not zhown in the inotarit drawin~l, for Very Jarg centrifugal, pump, edpia lWl those having 4

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-6drive shaft of about six feet in length or longqer and a very largqe pump housing, that ist an iipeller havng a.

diameter of about 20 inhes or greAter, addlitional. pump housing support 1qembers may be. run vertically between the motor support plate and the upper surface of the pump housng, A screen 39 onoir1les the 4nnuJlar support column 1 0ncn has el.ongated, narrow Qpeninqo 20 whioh preclude pasoage of any particles or aqqlomert e paatiole~ rr than the width ot the opening' slot 20, This is to prevent ndesirakly large ptartlom or aglomerates fromn enteqrtfg Into the pump ano Interferln y with the impellter, In riqure 2, the Impeller hAs been partcuzar3ly adapted to 4COommfoite the addition of an agitatQr element or AUqplr Wh J mpeller hb 21 has a thre aed uipper bare S by means of which the impeller Is threadted onto the drive shaft 10. A hoe nut 23 may be fastened onto the ond of the drive nhaft to lock the impeller in position. At the lower end1 of the modified hub, a threaded bore 24 exiztz Into which mnay be threaded a otub zhiift 25 whic-h I~ axially aligned with the drive 0haft 10, At the lower terminus ofI tub mhaft 2,5 Im a threaded element 26 onto which an agitator eement or augjer 2 7may be threaded, h cage 2 Ira affxed to the bottom~ ourface of the contrifugal pump housng 1i e uTetpper portion ofI the ~c aeo 29 io n ohallow cylinder havinr openting porto 30 in the vertical sdewalls and ports 31 In the lower andiplate of the cylcider. The rlander of the ane im conotructod or spaced pillars 32t which mnay servo to proteot the agitator whilo It lo operatIng and to protdct the agitatr 0 durinq instzallation ond erviingi Wtos, O eCially since the a gittor Is at the free and oe a rather long drive thaft, Tho coige or strainor dloes not Interfore with the agitator being ftull exposedj to tha %lurry In~ whjih eho in O ration' the submrerd pump Vill draw liquid, L a~ lUrry, from o location In tho vicinity of L~ Csrg X ~l eh$b4Pf~02 ~Al. b -7the upper ~oreen t9 into tho Upper Inl et Opelng 21, GonaJ2Ilyf be6aue of the settling oharateritic of par~tioes suspene din a 1l1quidQ, the QnQflqflt84tQn o soads in the violnity of the iuppeir sol4 0 9 is AAsutAly lower than the ooflonftratio of solids In the vlolnity of the lower inlet 10, tespqcialy since agitatioin auPO by augor 27 tends to -Ptiv 4nd ro-ussppnd particles whioh hacl settled onto the kbttqx ot the tank* Bautus ehis Is A dotible suation qqiltrifugal p ~iop, the V ume of liqud being pumPca l y the Upper Vanes 3is generally approdinTq toly th 44ad t the voumne beng tum~pe by the lowerl vaneo 14, Tbust app nratoly the We volutoe o oltirry per unit of time iz passin ito both inlets 17 anttd 18. Hoever', J~auza of the greater concentration1 or I$ solids In the agitated slurry betweewtiiin the bottom of tbo tank and the pump the effectve density of thu slurry eteing the ~lowr inlt 18 will be groatur than thnt *nt0ting the upper inleht 1, Sice the pump has A cOmm~ n volute ati A common coha~a jing, effluent fromi the pump I, a 2Q" ao 4Xtura of the olurry cocnrtons enter~ing tho, two at~i 4e pn~r Inlets. Thus, the denzi ty of$~r the offluent Is an ave g~$$~rago.

Ifth twO o tn1i ofO slU turry antoring the two inlet O~eing (A grae 00oto cocn~trtion eqae to a greter 4dety for slrre In which tho golid prIcleo 24 have a greater zpaoti± gravity thanater, Which I%~ loo hiormpow i le eurt to pum~p a certain ent.

(volue/Unit tii) ot 4uvvy which hag a donmity which i tho average of thath anterng th two Inleto than If all the uolury woro dr~awn by a minj1~ ou oton OontrIfug~q pump 1 froI th bottom 100t, Rnto a minLne vilned impolg er Docaume thq Auq; v IM at the lower tevminus of a fairly 1onqi dnivo OhAet, tho Auger mMult bo Peocilgely I)Ainced, To ovoid any im bolono In *I the the auqjv or la tho impalpe oe both tho iMPev1Qr and the miljor aro mado of viory hord mtoralo io, 44 o M111MI40 Abva'kon And~ rg jtliil E$3tlh 11 PYt;l'ili ~L~Q Pt~~ I"v1 erosion. A1Xo the damotoe of the auger i-0 Maintained relatively pa~rrw oo long as a narrow daMeter Is conistent with; the Aitating aotion doolred! oeneamllyp the diameter of the auger Will not eopee Moro thatn tWIoe the length of the AUgeur' The greater' the, Oiiamter, the gqeato the vibration evn for a omall a110t~ oZ imnbalance at the periphery of the auger.

enera:ly, the auger ise 1ated aboUt One u1th be lengh w -W t4hA Ihwer portion of the piuip houein 1$0 Ptato anQthevr way the length of the stu)b 0haft ax0lUeive of Its thr ooed ends Is apoxitmatel y the same length as that of the auger. Also, it Is desirable that the upper surface cf the auger 27 Is spaced a suficient ditanie from end tlate 31 to preclude ndue abrazion an the upper auger surface by slurry being "'trapper-III bowee the end plate an the uipper auger sufae In Operation, the d1a Inlet Pump Of thU in~tjnt I ittion has a depenent, Lo., zuzpenceld expo*me4 augjer Which Agitatem olurry In the proximity of the lower pump In letSome e~diet may oirculate alzo In the vicin'ty of tho upper puMp Inlat. Many olurrieU uc o mixtureg of Water and zeliA partile s of high speoific, gravity are d f floult to Mainta-in In a jolkirrlted Condition, Thu sole(I ptlolem tendt to zettlaj aQtc~u~ilting at the bottom of 8 tho mlrry tank Cvnl equippinj a typical slUrry tank with an enopenstet mixer m no A phop llr mixer wmy Minimi zsttling only Ir the vlolnity of th* micer, ThUm, an indopendnt. mdxer with Its shnft Xovated rotey froma tub.rge pump may riot atfeet the Qono otion Oif 3G tolio In th olurr pumd from tho tank.a~~a Tile dual0 Inlet pump of the Inznt Invention quippad with an nxialy axtndeX agitator tendai to eauiv Ino*atld flow (hdrabulle) curnto In the osturiy Contained Within A vessel. The flow of a !14wrY~ -into the 36 upper Inlet tenO4 to CAUsl e ddie and otirnts In the body of islurry above the subimergjd Vvmpa. These eddies hond i+ currents tend to minimize settling of solid$., the avttion action and the flow of Slurry into the lower pump inlet tend to cirouate s:lurry in the body of slurry below the subme1gqd pump, The aitotion action tends to StSt up nolids deposited on the tank flQzoo, An axial fto of fluid is directed downwardly by the agitator, such 4ow is a, flected by the tan% floor to tenl circolate outwardly and upwrdly to then blend into, the flow of slurry into the pump Inlotp, eippoially te l1QWer iBet, This combined action induced ky th er 1ution and lower svhctIon of the pump and the agitation of the agitator pvvides enhanced circuation over that aviablo from, A sjinqle pction pump equipped with a, iagtator or fr~om a double suctrio pump azooiated with a remote mtixer.

l D O8aUG Of the size of the PUMP hOUZI ng and 4tZ WUPPOrit rembe It would be virtually impozzible to looJite a oaparate, Indepndent propeler miXo% for o*mple ,In clorne proximity to the slurry zone immediataly below the To iohiava the deiiied, romlto from tho Intant inVontion the agitator eeit im affxecl aially to, In effect, an exten oln of the Impeller drive mhaft. Thut, the impeller and agitator rotate In the samin diroctioo l at the sramo rotatinal rate (rpm). The vnan on the "qitiAtor t boe inclined Zo am to direct li uid f(low axially ,w y fom~ the ahqtator The capoity of the dual ilutltion puMpv InvolveO In the ~iita inventioll anges fr rom oboUt te gonns po-ie minato (qpm) to about o00 qM althouqh typicailly from abQut P Opm to about 1000 gpm4 The diamotor or tho disolharjq outlet may rrnja firom about ona-haf Incb to 41about twelve Inc he* AtYpical Implle dlomte may L~njo f rom abLouit (ou inCheM in d(111i eter up to about 20 Itchom a romoe, Thi di eote ot th( Impaller, will umually be about thtree to four m tho mium di etoer of the Awqiei A at14b ohaet suitable for Uoe in the Instant invention ~y ronge from Oout three Inohes in lonqth, oxaluvo of threaded ends, up t, abot e~iht inches in lencjtli, Sutt4a,1 nugeA Aiay range in diameuter from aout B three inhes UP to OQUt 12 inches or more diametr at is; Widst d1mqn4qfl Auqor 1eflqths poy vary from abott tWo Inches Up to AB u Leht Inohe~ Qr pore'. TypQally the augQr 10 a tIrItu Q 4 tIono With Its base dimeter lager than its hight. The narrwer portion c aue s I sb po1ti0one more rearwricdiy from the pump haulntq tn The vanes or flightg of the allqor aro toually ?Qti1 4 uWt OAnP-ouzth inch to about QneIh IVrOor r al: In depth.

Althourjh vaio4o wpoci fic QMnfmitients of inventon have boonii described horoin, the Invention Is o intended to be limited t herey trtjt to Itiol~tude the pcope ofp In0 Tvention a% zt forh in thp, Apedd lio 41 L4 oara 4 40 c* 0 04fi 4, 41 4 44g 4444~" 4lr 4440 9 4,1

Claims (1)

1. 7. The pump of claim 1 wherein saitl auger has blades having respective lengths which are between one-eighth tQ one-half the maximum diameter Qf said auger. 8, A retrofit agitator kit for retrofitting to a dual, inlet, submerged pump having a. remote. unsubmorged motor, a vertical drive shaft and a pump housing having an upper inlet circumferential about said vertical drive shaft and a lower inlet, said retrofit agitator kit cOmPrsing- 1 ~v4Iwoo I tivig a pair of axially threaded IQ bores in oentrally pO t4Ooad upper a Qwer hus 0aid bore In $aid Upper hub MiZed t accept a threa4ed Male end of the Vertical drive Pahft said bore o the lower hub threaded and sized to 4 c0apt a threde dependent stub ;shaft I$ a stub shaft threaded oA- both ends, Ono and sized and threaded to fit In a threaded bore of the lower hub oft said Impeller and the other end adopted to qgnnoct sOouraly to an agitator; hf agit~tr havfing a pltirattiy of V4fB q 1 stich Q that, upon rtation of said a or, fluid In contact 'with gaid agitator is direqud downwardly and owa dly; and a cc ko oylindrical st:ranor bkvq opeg tnng 04 "rf therein which are Smaller an the space betoeon adacont SVanes of said 11ooler, 9 A tnk mot oed., Mol-riven vllr en oubmnerged contifugal slurry puttmp co-oprising: a dual Muotion Impler having n etral dinkt zaid central disk having a pstiV of oppo-.eod fiaces and impolrle vones MountEd on each maid fa~c of sad Qsntral disk; R dital inlets baoringleass P)UmP husIng having a n 04 uppor n I e t and a lowe in t I ad dua I Inlet, brdvngloss Pump houszing htlvlng snid dual Nuto-tionl jmrBoller munted thorein; t pni motor pQgtino romote fronfl said dtOinlet, boriue4Pump busning; Mounting menns to Mount Midd pump 110tolr to a1 lIquid- oo~nnn tank Above ti liqutid level of ;said Jiquid coantining ta n K.shr ~ft~s an elonqatedo pendant vertical drive shaft connected, at its upper end to said pump motor and at its lower, free end to said dual suction irpel.er; means to support said pumP housing; a cyl.indrical stztainer oage arttached over~ the lQWer inlet, said cage havinV Openings therin Usmaler than the minimum space between adjacent vanes of said dual suotion Impeller and having an end plate member haviis a central opening aligned with said pendant vertica. drive shaft, said end plate member dtsplaged downwardly from said lower a stub shaft depending from and secured, axially at its upper end to said dual auction imeplier and l xtonding throuh said end plate mem))erl and anr augo element attached over the lowor free end of saiSh to said end plate member. -100 A vtertiial3y oriented submeorged centrifugal slurry pump substantially as hereifbefQr- deosribed with respect to Figure 2 of the aqOcOMpanyinq drawings, 0 DAT~D: 28 April 19z At.brn6tv for; BAq 4 3 0 or 49 94