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Патент USA US2408776

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Oct. 8, 1946.
`
l `-R. P. -GREENWOOD- ~
v
2,408,775
l BOOSTER PUMP
~ Filed oct. 14, 1945`
- ¿Häiîii
i' l
Ã1@
Patented Oct. 8, 1946
~ 2,408,775
eATENT ïoFPlc-QE
fI
2,408,775. r
v
Boovscmu PUMP
' l
i l
Robert ‘P4 Greenwood; Youngstown, Ohio, assigner
Tesco l’roductsîuCogfa corporationïof Ohio
v Application october-14, 194s, serial No. 506.165v
‘14 claims. (ci. 10s-113)
2
travelina> ‘horizontal .planethat is at .a right
angle 'to the rotational axis of. the beater and
parallel to the plane. of' the impeller element of
_ ‘The present invention relates to centrifugal
pumps> of the booster type, and more particularly
to the iform. and disposition of parts of the struc
the pump. The S`-shaped curvejof the blades
‘preferably conforms ‘substantially with corre
ture. adapted- to prevent admission of air'bubble's
in: >the 'liquid' beingi pumped `from entering - the
spondingcurved recesses or channels between the
iinpelling` elements'of fthe centrì'fugally acting
. viins or blades of the .impellerymemben . A
impeller..
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.i
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y y. Additional objects, aims.4 and advantagesv of
It is'. the princi-pal object of this invention to
.simplify the 'construction of . a Vbooster vtype »of
centrifugal pumpv .such i as .contemplated herein, . 1.0
andlìto -improve the eñiciency and operation of '
such- pumn»
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.
.
stood v`from ‘theiollowing description, taken. in
.connection vwith the accompanying drawing
.
Thi'sinventi'on hasioran object the provision
of ,a centrifugal. booster pump structure-that is
especially-.designedfior use »with high-volatile 15
liquid fuel such .as favored for aircraft engines
that arerequired to» operate under .the wide. range
4of' barometric’pressures yWhiclsi .are encountered
betwee'nfthe normal.„ground` level. .pressure and
r.theÍpressure of extremely- ïhi-'gh .altitudes as well
,
.
~
l,
y
l is a vertical axial. section, partly in ele.
vatïon. disclosing, the> instrumentali'ties for prac
ticing the 'invention contemplated herein in a
‘i Fig.. `'2.is a horizontalsecti-on taken _on the
20 plane. oiline 2-Í2 on Eig... 1 looking in the Ydirec
.tionof 'the.arrows„portions,o'f the adjacent struc
turev ybeing omitted. for> clearness`
to
`.F-ig.,.3' 'isa top plan view on. .an enlarged scale
vof.' apreferred form. of lthebeater element shown
provide a novel'. beater for ejecting occludedv air
bubbles, the ystructure 'ot' suchbeater being adapt
A»edto reduce the requiredpowermput .and-,there
by decrease the .overall weight aswell. .as con
sumption of electric. current required- toï operate
lthe driving motor.;-`V
wherein:
„preferred embodiment thereof.
rastoiî the diiîerent atmospheric conditions. .' '
i " .'¿Anotherobj'ectof the present invention
the present invention will be apparenti-,o persons
skilledin the art fatter fthe _construction 'and yoper
ation' 'of 'the booster .purnpfand beater 'are under
îî’ì`g„`2A
~
.
,
«Lisa transverse section taken substan
tiallyonline
of Fig..3.
.
Fig. 5 is a plan View offa modified form of the
. .
beater..
«
"
.
f
.'
. » Aiurther . o _ ject gis’to provide. afbeater that :is
' of an S-shape having]unpitchedv blades or arms, feo l.. Fig,..6 isa. transversesectionon line Y'li-¿65 on
v.this-shape tending -.to,.decreasethe«torque load
„on the'motor.. c
,IE‘ig.-»5„„
l.
y
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Fig.. ’7> isa plan viewofanother modified form V
.Ñ
«, .A»_.sti11.further ,Objectis {saprai/ide a .beater
gotbeater.
.
~
,
n
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\ :.Fi'g. 8 isan .enlarged sectional view taken sub
l :thatnoperatesfto cause4 the bubbles v:to cling to i
stantially online 8458. ofA Fig.. 2.
the surfaces of .the blades and gradually.y move
,
rThe. drawing. i'svto be. understood as being more
or. less »f schematic for «the purpose of disclosing
¿outwarda-long .the trailing edge orsurface vto
wardsth'eutips ofthe blades before they are
>typical or preferred forms> of. the improvements
contemplated herein, and ingthedrawing .like
.reference characters >identify the same parts in
ejected." therefrom Iata location that is remote
to the. rótationalaxisand out of the path of
fluid ,discharging from. .the pump :inlet ',gulide.
.Whenîpitched bladesare used, thebubbles tend
V,toïleave the surfaces ¿of the blades a considerable
.differentviewsrw~
Y
Y
v
i
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.
.
` Referring; -to. Eigs.` 1 to 4, there »is shown apre
...distance inwardirom the blade tipsV _and thus
ferred varran'gement of centrifugal »pump vincor
porating
combination my vimproved lvapo-r
, _towards the impeller. Furthermore, when pitched
.blades are employed they create'a'region .of con
beater construction. The liquid fuel tank 5 has
`ïan-open-ingin its bottom lwal-l in which the booster
vming-le directlyin Y.the path _of v the fluid moving
`»piml'phassembly of the. centrifugal typeis installed.
siderable~-turbulence between.> the inlethead 'and ,
andthe inletmouthfrto the impeller increasing
r'I'hepurnp elements are mounted in la housing 6
,the novel .beater strueturefherein disclosed ¿the
„region ofv greatest turbulence is .outside and. be#
'Kyond the- path o_f -.the -iiuid. Ilowi-ng. to the inlet
50 l that converges ¿downwardly from its wide inlet
the. «electric .power consumption; whereasV with
having-.anaxially disposed concave inlet throat
„mouth so that the bubbles are ejected into'a "
zone beyondthe discharge .end of 4the .fluid‘inl'et
structure. Thebubbles in the presentstru'etu're"je
mouthß .toa lowerfdischarge opening 9. ,An
impellerzl'ß rcf the rotary centrifugal type is dis
posed in. close proximity tor-the discharge open
ing 9,.so I.that .the `spírally extending vanes l l and
'the íntermedíate'recesses or channels I2 of the
2,408,775
3
4
impeller are in closely spaced relation to the
adjacent housing wall surface I3. The liquid is
nular screen 25 is interposed across this space 24
and another screen 28 of cup-shape is mounted
on the top of the fluid guide 23.
discharged into a scroll or volute chamber I5 in
y,the housing surrounding the impeller Ill, that
For the purpose of preventing abnormal swirl
ing of the fluid within the inlet throat 1, a, bailling
structure may be introduced into the latter, said
baille structure embodying radially disposed sheet
metal- walls 2.1v that are-»secured-.to the _inner face
has an outlet stub I6 projecting laterally to the
housing and adapted to be connected in any suit
able manner to a fuel feed line leading to the
carburetor or other device where the -fuel is ,to
be used.> The impeller I0 is suitably' connected
of throat
'I'.â.
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to and supported upon the upper portion of a 10
For cooperation with the above arrangement
vertical shaft I'I that is journaled in the housing j v for effectively accomplishing the ejection of vapor
beneath the inlet throat member 'I in axial dis
u bubbles, I have provided a particular beater con
position relative thereto, and its upper end is Y* struction, a preferred embodiment of which is
provided with a tapered terminal supportL I8„that i , indicated` generallyat 39, located in the path of
is disposed axially Within the inlet throat 1. 4The vl5 >the liquid flowing from the guide opening 24 to
lower portion of shaft I1 has operative connection
_ wards the inlet throat 1 and preferably secured to
with and is rotated by a small electric motor (not - ' the' top of- theterininal end I8 of the shaft I1
shown) or other suitable prime mover.
for rotation with the impeller I0. The beater is
The spirally extending vanes Il and the in
positioned in a horizontal plane that is immedi
termediate recesses or channelsA I2 are Preferably 20 ately above the mOuth 8 of the throat and between
integralwith the diskor body of the _impeller l0,
said mouth and the discharge opening 24 of the
guide 23. In~ the more specific aspecty of my in
vention,> this beater 30 has a substantially S
shapeas Will beseen in Figs. 2 and 3,- and the
curved portions thereof are disposed inthe same
general trailing directions as the vanes andvchan
nels of the pump impeller l0 above which the
the channels l2 having a smooth curved contour
in cross-section and are undercut obliquely in the
disk as shown in detail in Fig, 8, so that the open
portions of the channels closely confront the
proximate `face I3 of the housing wall concentric
to the discharge opening 9 of theinlet throat
member 1. The inner` terminal ends I9 of the
vanes ll provide a plurality of sharp blades dis
`beater is shown in superimposed relation in Fig. 2.
The preferred form of beater 30 embodies a flat
.piece of metal having a generally rectangular
posed concentrically around the axis of the im
peller and they are slightly inclined. 'I‘he thick
ness of these blades increases towards the periph
cross-section as shown in Fig. 4, and comprises a
ery of the impeller disk although the transverse
dimensions of the intermediate recesses 'or chan
nels I2 are substantialy uniform in cross-section 35
central .hubv 3l with ,two _opositely disposed flat
blades 3_2 extending radially therefrom. It is par
ticularly important to note that blades 32 are- un
pitched so that the -leadinghand trailing edges
dimensions from their inner to their outer termi
33 and 34 ofeach blade are always in the same
nal
horizontal vplane which results invless agitation
ends.
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A
Viewed in cross-section (Fig. 8) a recess or
of the fluid that is moving towards the impeller
channel I2 is defined by the faces 20 and 2| Aof
I û. Consequently, the cut which the blades make
the adjacent leading and trailing vanes and these 40 in sweeping through the fluid is no Igreater than
faces are connected by Van inner curved surface
the thickness of the flat strip forming the blades.
_22. Thus, when the impeller travels in the di
There` `is_ no axial pumpingÍ tendency, and this
rection of the arrow (Fig. 8) lthe blades I5 of the
eliminates a considerable 'portion of the friction
vanes cut sharply into the body of iiuid adjacent „
the discharge opening 9 of the inlet throat„causing the iiuid, upon entering the channels be
tween the vanes, to turn at a 90° angleto .the
general plane of the impeller.
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l
which blades' of the pitched type create.
It will be noted that ilat beater 30 is positioned
an appreciable axial distance away from the
impeller I0 and the discharge openingß of the
~converging throat for more effectively separating
The `fluid entering the recesses or channels is
the vapor bubbles before `Athe 'liquid is Vadditionally
at low velocity which will result in a release of 50 `acted on'by the converged throat 'L '
any bubbles that may be in the fluid so that these
In operation, ìtarting at or adjacent the inner
bubbles will move upward' into the inlet throat
member. The fluid in the channels is> moved
centrifugally outward to the periphery ofthe im
peller at a constantly increasing velocity, due to
centrifugal action and will be, discharged >into
the volute chamber I5. While centrifugally trav
ersing the channels the fiuid, due to the shape
of the channel chamber, will also be whirled in
_portions ofthe blades, the bubbles will move
close to and across the blade surfaces'and will
collect back ofthe trailing vedges 434 of the blades
where, and due to centrifugal action, these col
lectedv bubbles then travel in a radially outward
'path along the trailing edges 34 until they ap
proach the tips of said blades-and they are then
ejected radially from the'tìps into an annular
a helical manner around an axis extending along 60 zone‘beyond the edge of the ~mouthi24v of the
the axis of each channel, and this rotation of the
fluid flow- guide `23, (passing through the screen
iluidwhile it is being forced centrifugally out
Y25) rising -upwardly on the outside of the guide
ward is adapted to impart additional'energ‘y to
and being _returned tohthe‘fluid in the tank or
the iluid therebyincreasing the lef?ciency of the
reservoir 5. Thespiral curvature of the beater
pump.
.
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Mounted in spaced relation above the iniet
throat 1 there is guide 23 having a tapered lower
portion that terminates in a discharge opening
24 that is axially aligned with the impeller Il)
and serves to direct the fluid into the inlet throat.
It will be seen that this discharge opening 24 is
of less diameter than the mouth 8 ofthe inlet
throat which permits egress of bubbles laterally
through the annular space between these ele- ,
ments as suggested by arrows in Iâ’ig.~ l. .an an
65 arms forming an S-like shape as a whole con
Itributes definitely to _the improved operation.` The
’explanation for this would appear to be similar
to that accounting forfthe improved operation
'of ythe correspondingly shaped' impeller vanes,
" namely, that the terminal areas offer less resist
fance _to vrotation and radialmovement of air
bubbles by virtue of the fact that the same ex
-Atend rearwardly trailing in', the general .direc
tion from which the lsame are moving> in being
75 rotated through 'the liquid.~y While the torque
112,408,775
:of v:the tank „as :Well as lside ¿wall installations.
frleduced‘ztofa
it îis :important l.to’znote
thatgt’he vapor bubble'zeliminating ¿capacity/'of this
,'mxpitched'ïbeater
While thisinwention has vbeen described inde
tail in itslpresent :preferred form or embodiment,
.it lwill be .apparent to personsskilled in :the art,
‘after :understandingthe improvements, athat uvar
.equal to ¿that :of , a :pitched
<_propellerltypezbeater.L
,
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6
v pumpinstallatîons introduced sthroughithe :roof v
for :power :required to `operate v.the ~ :beater is thus
,
: @From comparative tests ‘of a ;'1'0"-’1pitchf»propeller
y r4type beater’and my unpitched ‘S-shapedebeater,
îI .have .realized va Vreduction in lcurrent consumpf
ftfionîof Lthe‘order :of .one ampere ,and viinincreased
ious >'chan-ges 'and `modifications .may :be :made
'therein without departing from the spirit or scope
thereof. ’It is 'intended that the appended :claims
îpressure .boost ofxtheforder `'of two ipoun'ds per 10 cover all such changes and modiiications.
squareïinch. ~`‘This .represents :a realradyantage
el. 1n a ¿centrifugal pump, ahousing having. van
aircraft :installation `«Where output 'per _unit of
YWeight ’is critical.
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impeller chamber; 5a centrifugal impellerirotat
>
able `rin said œhamber., a' >fluid V1inletrthroat y¿confi
A,Thus the ‘inse iof >a flat iunpit‘ched ëbeater iila'de
municat‘m'g :with 'said 'chamber fforwardiy .of :said
uresults
¿an arrangement which :gives `anfin-~
lcreased pressure boost, and a decreased ¿rion
sumption of velectric current.` rîïlliisnrlay be .wattributed Ilargely v:to the :iac't- tha't‘the only pump
in'g'iactionlresulting ¿from tthe operation of ythis
:propeller is Vin- a `radial )direction and only-bub
bles are pumped îby this action. vinasmuch :as
there ‘is -no axial pumping, the motor Vload is less.
iimpel-ler; Yfa :fluid-:guide 'nn' directing ïflÍuid-’itof said
inlet; :and a beater ,interposed between said inlet
throat and said '-.iiuid guide, .said lbeater bîeing
arranged lacoaxïi'ally with isa'ìd ,'-i'mpeller Afor rota
ithe
tionimpellerand
«in ¿a iplane `:normal
»consisting
to the
:of :an
axis
'impitchedimem
lof rotation`
`ber Zhaving `leading :edges 'fandrtrailing edges :con
formed and arranged to operate.` so Vthat.rotation
-vof the-beaterabout ¿said axis vwill" cause ‘bubbles
-.of vapor'rto -be generated vtrono fluid ',directed'ioy
`saidguide tofsaid throat Without directly `Aaccel
erating the .speed ïo'f rthe'ifljui'd in ‘the 'direction :of
the said axis, the trailing edges of said fbeater
-inï some inverse :ratio to the motor .current drawn,
"'theßrnotor »has a' `tendency >'to :speed upfwhile .
-using ‘the ila't 'propeller'.
As 1a result of @this
>speeding-up, the impeller operates at higher
`speed giving even Èhigher:pressure than would ‘be
:the ‘case with the pump> loperating -at 9, flower
‘_beingadapted -to collect 'vapor bubbles along the
same andznove ther-'bubbles .radially ‘5to 'the ltips
rspeediavith an axial pumping propeller. ¿Therea 30 »offy
Athe "beater> to "be ejected-‘therefrom into a
-son forV this increase in l'pressure with the Vhigher
'ZoneV
outside the ¿influence fof the iluíd `guide.
'speed ‘is clearly ’understandable when -it is real
>2. ¿ln ‘a -'centrifugal fpinnpV adapted for âpumping
ized that the impeller fis' liar more `e’iìcient for
pumping than a 10° Ypitch propeller. vThus it -W-ill
.volatile .liquid :containing vapor, :a ‘housing hav
ing `anirnpeller chamber; a centriïfugalîimpeller
.rotatable `said chamber, said iimpell'er fiorr'ned
vvbe .seen thatïI obtain the fsa-me ‘vapor separating l
"action which Íis obtained 'with -alll° pitch k.pro
/peller »Witli‘more efficiency. 'lSi-nceï‘the unpitc'hed
»with -spirally 'cunvedv impelling vanos.; an inlet
throat communicating"withïsaid chamber Labove
»blades »reduce >the torque ïlfoad on the motor per
«said ‘rimpellerj -a Ílnid `guide for ydirecting ñu'id
'tozsafidinlet throat; and la beaterinterposed ’be
tween -said. inlet Ethroat and -said iluid fgui'd-e, >said
mitting it to operate ïfaster, this results inthe
"back elfectrorriotive force being ¿increased @and
therefore >the current l‘consumption through the
«beaterrbefing arranged .oo-axially with said ‘Jim
"series 'ñeld and armature fis decreased.y
"While I vliavendisclosed the preferredï‘îorrn of
impeller to be `used
îco'rnlbination -wiïtli my `un
v'pitched 'beater because of ï'öhe’improvedï'results
obtained, it Will beunfelers'toodfthat'lin the broader
«peller ît‘or 4'rotation linïa ' plane .normal to ith-e Saxis
«oîi' rotation'rot the `impeller and 4consisting of
radially opposite blades :disposed insa-id plane,
4.
„each-blade having `a Yportion curvle'd in the fgen
feral ¿direction of the 'impeller ymemïloers and’said
blades "together fioirinin'g an JS-‘sh'apeg‘ ‘the ïsa'i‘cl
blades 'being conformed and arranged to operate
'so'tha't rotation .of lthe sa’idb'eater'will cause bub
îlo'les 'of Á'Vapor >to 'Ibo-generated -iromfñuid directed
Í aspects of my invention I >also Í contemplatevother
‘available fforrns -o‘f impellers.
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vTn >lieu of 'the -»ñat “blade-beater "above ~-de
vsuch
scribed,
`as the
Villustrated
beater 'in
mayFigs.
`embody
-5 anda- 7.,
wire
»which
'element
>llas .
an‘arcuate or cylindrical contour "morose-'section
¿b‘yfsaid fguide to ¿'saidthroat Without directly =ac`cel'ereîting »the flow »of iñuïid‘in ‘the direction' of the
said axis, :and substantially »fal-l `the blib-bles ‘to
'as s‘hotvn in ‘Fig 6. ïîn -ïthe*structure illustrated
lin Fig. 5, -the wire S5 «is» »preferably of suiiicien't
'îbe lco‘lilected :along lthe A*trailing edges, the said
Ygauge and stiiîness> to be 'formed into a perrnaï- ~
nent VS-slriape and suitably mounted upon kthe
terminal end vI 8 .of theactuator or `s'haîitjlfl.> lIì‘he
wire íiiëV shown` in Fig’. 'l is _oía flexible charac
ter .and isstraight .trom end .toend .When not ¿be
ing rotated. When this latter type vof vbea/ter „is
»rotated throughthe «fluid itxWi-ll bend backwardin
4a'trailing »manner nand assur-ne »an -’St-shape >»as
~-collècted`ïbubbles bei-ng moved A'cent'rifffugaflly along
the' blades .and vejected :from ‘the tips 'thereof into
a zone >radially outward ofthe discharge ‘terminal
' Loi said il'uid guide.
a centrifugal pump adapted ïfor pumping
l volatile liquid containing Lvapor, avhous'in'g having
an impeller chamber; a centri gal "impell'er >ro
’ ‘ita-table ¿in saltiv chamber, s'a‘id Llll‘npellerA formed
-.shown in -dottedïlines onli’ig, 7.. -ln both of-these
v.tîsfpesfof fWireJeea-ter the bubbles Willicollect 'back
«of the trailing surfaces of .the A‘S-*s'hapedï blades
and .they'will be .ejectedjiradially »outward 'from
the tips Vdof said- blades. The results >attained-toy
f these Seshaped wire beaterszare suhstantially‘the
Asame as With'the :use :ofthe :flat unpitehed ¿blades ` 70
.previously explained.
K
.Itisimportantto note that while I have gshown
A`aninstallation in `>the :bottom lofïa -fuel tank by
`way of example, :my invention .isequall-y TYapplica
~¿ble -to yother .arrangements including y.booste-r
with spirally -eur-ved impe-lling vvvaries? `aninlet
throat communicating with said :lcliamber'ifor
Ward'lyV of said impeller'.; a fluid guide for’fdirect
ing rfluid to'said inlet throat; ,and an S-'sihape
`rotatable beat-er interposedfabetween -said inlet
thro-at and said fluid guide, esaid 'beater .consist
ing Yof ¿radially v’opposite ‘flat :unpitehed blades dis
"ilosed‘inïa planezat'a right-angle tofth'e rotational
axis ‘of the beat-er :and 'in spaced >relation zwith
v.said throat, :each .Je-lade .having a :spirally *curved
_portion -¿disposed in the >general :direction of >the
spiral íimpeller. vanes; `the radial zirmer portions
2,408,775
'of the impeller vanes and the leading edges of
the beater blades respectively being conformed
and arranged to operate so as to generate bub
bles of vapor from fluid directed to said throat,
and the trailing edges of the curved flat blades
adapted to collect vapor bubbles back of the same
and to mo-ve the said collected bubbles centrif
ugally to their tips and eject the bubbles radially
into'a zone outside the inñuence of the liquid
being discharged by said guide.
4. A beater for a centrifugal booster pump, con
8
mediately of said inlet throat and said fluid guide
`for rotation in a plane normal to said axis, said
beater consisting of an unpitched member having
leading edges and trailing edges conformed and
arranged to operate so that rotation of said beater
will cause bubbles of vapor to be generated from
ñuid directed by said guide to said throat with
out directly accelerating the speed of the ñuid
in the direction of the said axis and substantially
10 all the bubbles of vapor generated from said ñuid
to be collected along the trailing edges and trans
sisting of a plurality of thin, radially opposite
blades having closely spaced opposite flat sur
lated therealong to the outer extremities of the
beater whence they will be ejected in a generally
faces and arranged for rotation about a central
radial direction in relation to the said axis to a
axis normal to the flat surfaces/said blades hav 15 Zone outside the zone of influence of the fluid
"ing leading edges and trailing edges so conformed
guide.
and arranged that the radially outer vportion of
8. In a centrifugal pump assembly, a housing
each Vblade curves backwardly and the leading
having an impeller chamber, a centrifugal im
edge of one blade and the trailing edge of an
peller arranged in said chamber for rotation
opposite blade form generally an S-curve and 20 about a vertical axis, a fluid inlet throat arranged
that rotation of the beater about said axis in a
in co-axial spaced relation with said impeller and
stream of fluid flowing to the pump and Within
communicating with said chamber above said
a. body of the fluid will cause bubbles of Vapor to
impeller, a fluid guide for directing iluid to said
be generated from the iiuid without directly ac
inlet throat and arranged in co-axial, spaced re
celerating the ñow of ñuid in the direction of the
lation with said throat, and an unpitched beater
axis and substantially all the bubbles to be col
arranged co-axially with said impeller and inter
lected along the trailing edges and translated
mediately of said throat and said fluid guide for
therealong to the outer extremities of the beater
rotation in a plane normal to said axis and in
whence they will be ejected from the stream in a
spaced relation with said throat, said beater con
generally radial direction in relation to the axis. 30 sisting of radially opposite blades disposed in a
5. A beater for generating bubbles of vapor
horizontal plane and with leading edges and
from a stream ~of fluid flowing to a centrifugal
trailing edges arranged and conformed so that
pump and consisting of a thin blade having oppo
the leading edge of one blade and the trailing
side ñat surfaces of generally S-shape arranged
edge of the opposite blade form generally an
Afor rotation about a central axis normal to the
ñat surfaces, said blade having a leading edge, the
radially outer portion of Which curves backwardly,
S-curve and that rotation of said beater in a pre
determined direction will cause bubbles of vapor
to be generated from fluid directed by said guide
and the edges of said blade being so conformed
to said throat without directly accelerating the
and arranged that rotation of the beater in a pre
speed of the fluid in the direction of the said
determined direction about said axis in a stream 40 axis and substantially all the bubbles of vapor
of fluid flowing to the pump and Within a body of
generated from said fluid to be collected along
the fluid will cause bubbles of vapor to be gen
the trailing edges and translated therealong to
erated from the fluid without directly acceler
the outer extremities of the beater whence they
ating the flow of fluid in the direction of the axis
will be ejected in a generally radial direction in
and substantially all the bubbles will be collected
relation to the said axis to a zone outside the zone
along the trailing edges and translated there
of influence of the fluid guide.
along to the outer extremities of the beater
9. In a centrifugal pump assembly, a housing
whence they will be ejected from the stream in a
having an impeller- chamber, a centrifugal impell
generally radial direction in relation to the axis.
er arranged in the chamber for rotation about a
6. A beater for a centrifugal booster pump con 50 vertical axis, the impeller being formed with spir
sisting of a flat strip providing oppositely disposed
blades arranged for rotation about a central axis,
the said blades being generally of S-shape and
having opposite flat surfaces normal to said axis,
the radially outer portion of the leading edge of
each blade being curved backwardly and the lead
ing and trailing edges of each blade being so con
formed and arranged to operate upon rotation in
ally extending impelling vanes arranged in radially
spaced relation with the axis, a iluid inlet throat
arranged in co-axial, spaced relation with the
Yimpeller and communicating with the chamber
above- the impeller, a fluid guide adapted to be
mounted in a body of fluid for directing fluid
from the body to the throat and arranged in co
axial, spaced relation with the throat, the vanes
a predetermined direction of said beater in a body
being arranged whereby upon rotation of the im
of fluid as to generate bubbles of Vapor therein 60 peller in a predetermined direction radially inner
and to cause the bubbles so generated to collect
portions of the vanes will generate bubbles of
.along the trailing edges and to be translated
vapor from fluid directed to the throat and the
-therealo'ng tothe outer extremities of the blades
bubbles will be caused to flow upwardly in the
and thence ejected in a generally radial direction
throat and into the body of fluid, and an un
in relation to said axis.
65 pitched beater arranged co-axially with the im
7. In a centrifugal pump assembly, a housing
having an impeller chamber, a centrifugal im
peller arranged in said chamber for rotation
about a Vertical axis, a fluid inlet throat arranged
in co-axial, spaced relation with said impeller and
communicating with said chamber above said
impeller, a ñuid guide for directing fluid to said
inlet throat and arranged in co-axial, spaced re
lation with said inlet throat, and a beater ar
radially opposite, flat unpitched blades disposed
,ranged co-axially with said impeller and inter
generally an S-curve and that upon rotation of
peller and within the body of fluid intermediately
of the throat and the fluid guide for rotation in a
plane normal to the axis and in spaced re
lation with the throat, the beater consisting of
in a horizontal plane normal to the axis and hav
ing leading edges and trailing edges arranged and
conformed so thatthe leading edge of one blade
and the trailing edge of the opposite blade form
»
10
Y
thereof „ a centrifugal pump secured to the outside
0f the tankadiaoont Saîd'outletand compriSîne a
*housing having 'an-impeller chamber, a 'spirally
the beater‘in a predeterlnï „eddirection bubbles ,of
vaporwill regenerate f
ñ- 'd direetedhy
the guide. to the throa
' »
ating the .speed> of the ilu
axisy and substantially a.
eenerated'iromîth
.
Mitteler
y varied impeller. arranged insaid chamber for rota
tion abouta vertical axis, an inlet throat arranged
in .co-axial,y spaced relation , with _said impeller
direction. ,0f »the
"thembulobles .OIiNaPOr
,de will yto colleotedtalong
the trailing edge aridftwnslatedtherealong to
the outer extremities ofthe heater: whence-»they
will be ejected in; atelier-ally. radialfdirectioe .11.1
vrelation .to the .axis tov
Outsidethe .Zoneofinfl
_
., ,.
,_
,
10. In a cent ifuga1_¿. pump, assembly including
andà communicatingv 'witlil _said outlet „and said
¿chamber above said impeller, and aguide mounted
intheY tank and arranged »in ctn-axial, spaced rela- Y
w`_ith„saidY inlet jthroa"r,`forf directing fuel to
A19 >.tion
Said-throat, a beaterarranged in open communi
»cation witha body of fuel inthe tank and co
' .axiallyvwith said .impeller andintfermediatelyof
a housing having an impeller chamber, a cen--
trifugal; impeller, arranged,
said throat'and `said guide for rotation ina plane
said chamber for
.normal to said axis, said beater consisting ofan
rotation about a vertical axis, a fluid inlet throat
arranged in co-axial, spaced relation with said
impeller and communicating with said chamber
above said impeller, and a fluid guide for direct
ing fluid to said throat and arranged in co-axial,
spaced relation with said throat, a beater ar
ranged co-axially with said impeller and inter
mediately of said throat and said fluid guide for
unpitched memberhaving thin, radially opposed
blades with closely spaced opposite flat surfaces
disposed in parallel relation to the plane of rota
tion and so conformed and arranged to operate
that the leading edge of one blade and the trailing
20 edge of the opposite blade form generally an
S-curve and that rotation of said beater in a
predetermined direction will cause bubbles vof
vapor to be generated from fuel directed by said
beater having thin, radially opposite blades with
closely spaced opposite flat surfaces disposed in 25 guide to said throat Without directly accelerating
the flow of the fuel in the direction of the said
parallel relation to the plane of rotation and lead
axis andV substantially all the bubbles'will be col
ing edges and trailing edges so arranged and con
lected along the trailing edges and translated
formed that the leading edge of one blade and the
therealong to the outer extremities of the blades
trailing edge of the opposite blade form gener
whence
they will be ejected in a generally radial
ally an S-curve and that rotation of said beatervv
direction
in relation'to the said axis to a zone
in a predetermined direction will cause bubbles of
of said body of fuel beyond the Zone of influence
vapor to be generated from fluid directed by
of the guide.
'
said guide to said throat without directly acceler
1‘3. In a centrifugal pump assembly, a housing
ating the speed of the fluid in the direction of the
having an impeller chamber, a centrifugal im
said axis and substantially all the bubbles of vapor
peller arranged in the chamber for rotation about
generated from said fluid to be collected along
a vertical axis, the impeller being formed with
the trailing edges and'translated therealong to
spirally extending impelling vanes arranged in
the outer extremities of the beater whence they
radially spaced relation with the axis, a fluid inlet
will be ejected in a generally radial direction in
rotation in a plane normal to said axis, said ,
relation to the said axis to a zone outside the zonel
of influence of the fluid guide.v
1l. In a liquid fuel system, a liquid fuel tank
having an outlet in the bottom thereof, a cen
trifugal pump secured to the outside of the tank
adjacent said outlet and comprising a housing
having,- an impeller chamber, a spirally-vaned
impeller arranged in said chamber .for rotationr
throat'arranged in co-axial, spacedl relation with
'the impeller and communicating with the cham- ,
ber above the impeller, a fluid guide adapted to
be mounted in a body of fluid for directing fluid
from the body to the throat and arranged in
co-axial, spaced relation with the throat, the
vanes being arranged whereby upon rotation of
the impeller in a predetermined direction radially
inner portions of the vanes will` generate bubbles
of vapor from fluid directed to the throat and the
in co-axial, spaced relation with said impeller
and communicating with said outlet and said 50 bubbles will be'caused to flow upwardly in the l
throat and into the body of iluid, a baille arranged
chamber above said impeller, _a guide mounted
transversely of the throatto equalize the flow of
in the tank and arranged in?co-axial, spaced
fluid therein in the direction of the axis whereby
relation with said inlet throat for directing fuel
to‘ enable substantially uniform generation of
to said throat, and rotatable beater means dis
bubbles by the impeller vanes and to direct the
posed intermediately of and in spaced relation
upward flow of bubbles generated by the impeller
with the guide and the throat and in open com
vanes to the zone ofloperation of the beater, and
munication with a body of fuel in said tank, said
an unpitched beater arranged co-axially rwith the
beater consisting of a thin blade having opposite
impeller
and Within the body of fluid inter
flat surfaces of generally S-shape arranged for
mediately of the throat and the fluid guide for
rotation about a central axis normal to the ñat 60
rotation in a plane normal to the axis and in
surfaces and >co-extensive with the said vertical
spaced relation with the throat, the beater con
axis, the blade having edges conformed and
sisting of radially opposite, flat unpitched blades
arranged to operate so that rotation of said beater
disposed in a horizontal plane normal to the axis
inv a predetermined direction will cause bubbles
and having leading edges and trailing edges ar
of vapor to be generated from fuel directed by
ranged and conformed so that the leading edge
said guide to said throat without directly acceler
` of one blade and the trailing edge of the opposite
ating the flow of the fuel in the direction of the
blade form generally an S-curve and that upon
said axis and substantially all the bubbles to be ’ rotation 'of the beater‘in a predetermined direc
collected along the trailing edges and translated
tion bubbles of vapor will be generated from fluid
therealong to theV outer extremities of the beater 70 directed by the guide to the throat without directly
whence they will be ejected from the fuel directed
accelerating the speed of the fluid in the direc
to the throat in a generally radial direction in
tion of the axis and substantially all the bubbles of
relation to the axis;
vapor generated from the fluid will be collected
12. In a liquid fuel system including a liquid
along the trailing edges and translated there
75
fuel tank having an outlet in the lower portion
about a vertical axis, an inlet throat arranged
"2,468,775
l1
,
along to the outer extremities of the beater whence
they will be ejected in a generally radial direction
in relation to the axis to a zone of the body’ of
fluid outside the zone of influence of the fluid
guide.
,
-
14. In a centrifugal pump, a housing having an
impeller chamber, a centrifugal impeller rotatable
in‘said chamber, a fluid inlet throat communicat
ing with said chamber forwardly of said impeller,
a guide for directing fluid to said throat, and a
beater consisting of a member having opposite,
unpitched surfaces, interposed between said
throat and said guide, said beater being arranged
coaxially with said impeller for rotation in a
1-2
vplane normalto the axis-of rotation-of thein’il
peller and having leading edges and trailing edges
conformed and arranged to operate so that rota
tion of the beaterY about said :axis will cause
bubbles of vapor to be generatedfrom fluiddi
rected by >said guide to said throat Without‘di
rectly' accelerating the speed> of the fluid in the
direction of the said axis, thetrailing edges of
said beater beingadapted to collect vapor bubbles
along the same and'move the bubbles to the tips
of- the beater to be ejected therefrom into a zone
outside the inñuence of the irìuid guide.
`
ROBERT P. GREENWOOD. ~
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