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Патент USA US2405836

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A. 13, 1946.
H. E? LAIBOUR‘
. I
‘ _
2,405,835
SELF-PRIMING PUMP
Filed March_8, 1944
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INVENTOR.
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BY
\ Aug. 13, ‘1946. '
‘H. E. LA BOUR
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2,405,836 .}
SELF-PRIMING PUMP
Filed March 8, 1944
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,Filed Mai‘chB; 1944
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‘INVENTOR.
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BY
Patented Aug. 13, 1946
2,405,836
UNITED STATES PATENT. OFFICE
“
2,405,836
' ’ SELF-PRIMING PUMZP
Harry E. La Bour, Elkhart, Ind.
Application March 8, 1944, Serial No. 525,530
1
7 Claims. (01. 103-413)
2 ,
The present invention relates to self-priming
other words, there must be a continuous supply
pumps. A primary object is to provide a novel
arrangement and relation of throats which at
tains greater e?iciency on liquid pumping, and
which also provides better gas pumping charac
of working medium, that is, a ?ow of liquid to
carry out the air; Since immediately after initial
starting of the impeller there is substantially no
liquid in the impeller chamber, and there is only
a small head of, liquid inthe‘separator available
teristics when the pump is priming.
Another primary object is to provide a novel
structural’ arrangement of the necessary parts
to initiate the return flow, the tendency of the
rapidly'revolving blades is to check the return
?ow. This is due both to the blocking e?ect
of a self-priming pump to secure certain advané
tages in manufacture, in operating characteris
tics and in repairing and servicing, as will be
more fully hereinafter disclosed.
Other objects will be apparent from the fol
10 of the impeller blade, which in the case of curved
blades is very substantial, and also due‘ to. the
centrifugal force of the very light medium in
the impeller chamber choking return ?ow at
lowing speci?cation, drawings and claims.
both throats. Since the force which tends to
A pump exhibiting the preferred embodiment 15 establish the return how of liquid, namely, the
of my present invention is of the type of my
gravity head of liquidinthe separatonis small,
basic expired patent, No. 1,578,236, and employs
the elastic fluid pressure developed by the im
the improved throating of the type disclosed in
peller
upon thethin gaseous medium in the im
my prior patent, No. 2,291,478.
chamber tends merely to block any‘sub
A self-priming pump encounters the con?ict 20 peller
stantial return of priming liquid, at the same
ing requirements of e?iciently pumping gas dur
time failing to expel any substantial amount of
ing priming and e?iciently pumping liquid dur
air. The pump thereupon exhibits at this initial ~
ing liquid pumping. The density of air as com
stage a disinclination to initiate the orderly cir
pared with water is in about the ratio of one to
culation, which is termed “priming stall.”
eight hundred. Hence the same impeller and 25 Opening up the priming throat to overcome
casing applied to air or other gas and to water
this initial priming stall entails the undesirable
or other liquid gives at the same R. P. M. vastly
consequence of too free return of the liquid when
different results. As is known to those skilled
the
pressure difference between the impeller
in the art, the self-priming pump of the hy-‘
chamber and atmosphere becomes relatively
draulic balance type of my prior Patent No. 30 great, as when the pump attains a substantial
1,578,236, removes the air by forming a mixture
vacuum;
of liquid and air in the pum ing chamber, dis~
charging the same into a separator where the air
is disentrained, and returning the liquid freed
of air into the impeller chamber peripherally to 35
be again mixed with air and discharged in a
continuous operation.
The present .pump herein illustrated employs
a main throat and an auxiliary or priming throat
with a suitable expanding passageway for each
_
In the older form of throat, such as was em
ployed prior to Patent No. 2,291,478, the .most
restricted part of the main throat and of the
priming throat was at a substantial distance
away from“ the opening of the passageway into
the impeller chamber.
This provided a pre
throat enlargement or pocket, and apparently in
that form of throat there was a burble or eddy
The same ?uid
between the impeller chamber and the separator
(mostly air) that left the tips of the impeller
chamber of the character disclosed in the afore
eddied and regurgitated in the pre-throat
said patent, No. 2,291,478. In the priming of a
pockets of each passageway, with the result that
pump of this character, the priming charge of
substantial quantity of air was discharged.
liquid is initially thrown out of the impeller 45 no
Hence,»priming stall Was at its worst. .
chamber upon starting rotation of the impeller.
Y I-Ieretofore, in order to overcome the priming
The‘ medium which remains in the impeller
stall in pumps of the peripheral reentry type,
chamber is substantially, only air received from
the priming throat has been made relatively
the suction pipe. Since ‘the air is of so low a
large,
so that there would be greater freedom
density that no- adequate delivery pressure can
50 for the reentry of water to break up the priming
be developed, liquid must be admitted in order
stall. This,however, entailed the disadvantage
to make a dense enough ?uid medium to start
that as the vacuum increased, the amount of
an orderly discharge from the impeller chamber
liquid returned to the pumping channel in
to the separator, and a return of liquid from
the separatorv into the impeller chamber; In
40 in each pre-throat pocket.
creased, and the entrainment and carrying out
of air was ineffective toilet the pump evacuate
2,405,836
3
liquid to carry the operation to a satisfactory
high dry vacuum.
With the slot type of throats of my Patent No.
2,291,478, the maximum restriction of the pas
sageway is substantially at the junction of the
passageway and the impeller chamber. I con
ceived that this form of throating might be em
4
reaching maximum dry Vacuum at least twice
as long.
The form of pump illustrated and described in
this application involves a compact pump which
is arranged for maximum ease in servicing and
replacement of the wearing parts, and for facility
in providing access to the inside of the pump, as
for example, to clean out the strainer.
ployed in a novel ratio of throat sizes as between
While the present pump is shown as a general
main and bypass throats, which would accom
utility pump, the design is suitable for acid serv
10
plish two highly 'desiredipurposes which ihereto
ice by the employment of a metal or material
fore have been antagonistic to each other, that
which is not attacked by the liquids which the
is, shorten the slot length, that is, the cross
pump may be called upon to pump.
sectional area of the priming throat, whereby at
Referring now to the accompanying drawings
high vacuum the amount of liquid returned
in which I have illustrated the preferred em
15
would be controlled, and at the same time
lengthen the slot of the main throatfwhéreby “a ' bodimentpf the present invention:
‘Figure 1 is a vertical, longitudinal section
more rapid initial evacuation ‘of fair "would be
through
a pump embodying the present inven
secured, and thereby the priming stall would be
tion;
reduced or eliminated.
Figure 2 is a vertical cross section taken on
_ The total outlet area for a given velocity of 20
liquid traveled through the throatirig to ‘give a
predetermined delivery by a pump of given di
mensions and speed may readily be determined
by dividing the total-delivery‘flow byth‘e "selected
rate ‘of ?ow through the ¥throating. ‘The novel
arrangement‘of a shorter ‘slot for {the priming
throat and a longer slot-for the main‘throat is
to ~>bemade while maintaining the-total throat
area’ at the predetermined ‘oroptimum value. -'
In-a pump having-amain throat- and-a' priming
throat, where both throats operate upon "maxi
mum’ delivery, the total 'throating area is dis
tributed between the main and the ‘priming
the line 2,2 of Figure l;
Figure 3 ‘is ‘a horizontal section taken on the
line 3, 3, of Figure 1 looking in the direction of
the arrow;
Figure 4 is a fragmentary sectional view of a
clamping ?ange;
Figure 5 is a diagrammatic development vof the
main thro'at'and discharge passageway, with sec
tions showing the crosssectional area at various
stages or locations; and
Figure 6 is a diagram, similar to Figure 5,
showing a like development of the priming
throat and passageway, with the cross sections
at various-‘stages indicated.
I
The pump comprises three main stationary
I discovered that by reducing the length of slot 35 parts, namely, the separator I, ‘the impeller
of'the bypass throats,- and-substantially increas
chamber body 2, and the combined trap and
ing' the longth of‘slo't ofjthe main'throat, it was
front
plate 3, which parts are allibolted‘together,
‘possible 'to simultaneously overcome, or at least
as will be described in detail. Themovingpart
‘greatly ameliorate the difficulties ‘oi-the two con‘
?icting ‘requirements, v"namely, of overcoming 40 is the open impeller 4 with its integral impeller
shaft 5.’
rapidly the ‘priming stall and of preventing --ex
The main impeller chamber member 2 com
ce'ssive return ?ow ‘of priming ~liquid on high
prises a backplate portion 6 which has a periph
vacuums. And this is ‘attainable without sub
eral ?ange 7 interrupted by the mainthroat 8
stantially impairing the "e?icien‘cy of liquid
and
the priming throat'9, as will appear from
45
‘pumping.
,
‘
I
;
"
V
'7
‘Figure 2.
For'best results, I'?nd that the ‘length'of‘slot
The main threat 8 is disposed in the fourth
of 'thepr'imin'g throat ‘should be substantially
quarter of the circumference of the impeller
‘50% oi'th'e length ofthe' main throat. This ratio
‘chamber 10, so that the main discharge passage
throats in the present novel ratio.
may be varied ‘due to differences ‘in ‘length‘a'nd
way I8 extends in substantially a vertical di
con?gurations of the passageways, so that'the 50 rection, substantially tangent at its lower end
length of slot of the priming throat may‘ bemore
‘to-‘the inside wall l2 of the impeller chamber l0,
or less ‘than 50% for the best efficiency, most
and‘ substantially tangent to the circumferen
‘rapid ‘ priming ‘and vhigh “dry ‘vacuum, but the
‘
tial
walls of the separator I. The passageway
mean, I‘?nd ‘byexperimentds‘ where the length
l8, which is the main discharge passageway, eX
‘of priming throat slot 'isapproxim'ately half ‘that
pands in cross section, ‘as will be understood by
‘of ‘the ‘main throat, and 'thetw'o'throats and
reference to Figure 5 from the throat 8 to the
passageways ‘are ot'similar'coniiguration. It is
upper'end of the main pump body 2 which ter
to be ili'lde‘rstood. that wnen'i‘speak (if slotllke
minates in the bolting ?ange 14. The portion
throats, ‘I‘ refer to a width or throat opening
of the main passageway H3 in the separator
axially of the impeller which is at least one 'e'ighth 60 chamber body I is designated as [8b. It lies above
inch, less than the width of the blade 'tip‘co
the clamping ?ange l5, and opens tangentially
operating therewith.
to the inner circumferential wall i3 of the sepa
In tests which I "have run on this type'o'f
throating, I ?nd that thetime of'the priming
stall'may be cut in half, that is, it will take only
.one'half the time'th'at itpreviously did to "start
theorderly circulation and rapid air evacuation.
The e?iciency' has run as highas ‘65% on a200
gallon per minute pump, ‘operating at ‘1750
R, P. M.,and a delivery pressure of 102 feet head,
whereas, in older forms of the same size pump,
‘the head was as much as l?l'feetless, and the
efficiency as much as ten points lower, the prim
ing stall twice as long, and the-over-‘all time of
rator.
I
The priming throat 9 opens into the “passage
way 19, the major part of which we lies-within
the pump body 2, and the minor part of the
same, 191), lies above-the clamping ?ange I 5-in
‘the separator body I. The separator l contains
‘a separator chamber de?ned :by generally .cylin
drical walls, the axis of the cylinder being sub
stantially parallel to theaxis of the impeller
shaft -5-, but the bottom part of the Space vHi has
afflat bottom wall throughout the major partioi
its length. A pocket 420 is formed by continu
2,405,836
5
ation 22 of the cylindrical wall adjacent the up
per end of the passageway 19b, 'so as to form a
sealing body of liquid to seal the return passage
way 19 against the drawing of air therethrough,’
particularly whenthe pump is operating under
high vacuum. The front head or front wall 23
of‘ the separator lies next to the outlet of the
main discharge throat l8, and its upper part ex‘
6
of the trap and front plate member '3. There'is ’
a‘centr'al inlet opening 43 from‘the trap chamber
44 into the recess formed at the central partof
the impeller 4. ‘The main body of the trap is
formed as a vertical ?attened bottlelike body with
a neck with the walls 45 merging laterally with
an inlet connection or neck 46 for the inlet or
suction passageway 41. A vsuitable clamping
?ange .48 terminates the neck 46 to adapt’the
tends diagonally upwardly and toward the plane
of the'passageways l8—l9, with the result that 10 pump to be connected to a suction pipe. A circu
the issuing stream of mixture tends to be crowd
lar opening 49 is formed in the upper end of the
ed endwise of the surface of revolution, that is,
neck of the trap body 3, this opening being closed
along the cylindrical wall, to which the passage
by a round disklike cover plate 55 which seats on
way I 8 is substantially tangent;
a suitable gasketed seat 52 on the body member
This may be understood by reference to Fig 15 3. The opening 49 is large enough to pass the
ure'l, wherein it may be seen that the two pas
cylindrical screen member 53 which rests on the
sageways, I8 and [9, lie substantially in the same
bottom wall 54 of the intake trap member 3. The
vertical plane at right angles to. the impeller
piloting stud 55 is formed integral with the bot
shaft. ‘The issuing stream of mixture is forced
tom wall 54 and opens into a hole in the plate 53
or crowded to the right as viewed in Figure 1 to 20 which closes the lower end of the screen 53. The
describe an arcuate somewhat helical path en
screen 53 is held down by gravity, and held against
gaging in an upwardly arched‘path along the
lateral displacement by the pin 0r stud 55 which
cylindrical wall indicated at 24, and then follow
projects into a hole in the bottom wall of the
ing on down and striking the ?oor H, which
screen. A suitable diaphragm or annular. ?ange
tends to check the rotary or whirling movement.
51v provides an opening which allows the screen
This action of the arching ?at streamof mixture
53 to pass therethrough, and be seated therein.
is highly ef?cient in disentraining air. The de
The closure plate 50 is clamped in place by a yoke
livery passageway 25 from the separator is offset
51 and bolt 58, the ends of the yoke hooking over
with respect to the plane of the discharge throat
lugs formed on’the sides of the'neck of the said
and passageway‘ltl, so that the issuing stream of 30 inlet trap member 3. By reference to Figure 3 it
mixture is not thrown out of the discharge open
will be seen that the cross section of the main
ing 25 while priming occurs. The discharge
body‘ of the trap below the ?ange 51 is oblong so
opening 25 has a suitable neck 26 provided with
as to provide a fairly large volume without in
a clamping ?ange 21, which may be integral, or
creasing the fore and aft dimension of the pump.
which may be a split clamping ?ange indicated
When it is desired to clean out the strainer 53,
at 21 in Figure 4.
the clamp 51, 58 is released; the cover 59 is re
The impeller 4 has open blades. The blades
moved,
and by inserting a hook on the inside of
preferably have curvature particularly in the
the
strainer
basket 53 the same may be withdrawn
larger sizes of impellers. For smaller sizes the
through the opening 49.
blades may be substantially straight. The ef
The intake trap member has a supporting foot
?ciency in the larger sizes is better with an im
peller having some curvature.
The blades are
tapered in the axial direction towards their tips.
59 below the same for carrying a part of the
weight of the pump. A .releasable ‘Cover 60 for a
drain opening 62 permits the liquid to be drained
impeller is employed, although the number of 45 down to the bottom of the intake opening 43.
In operation, the pump is provided with a suit
blades is optional. Where the blades are curved,
able priming charge, which is su?icient to serve
preferablya smaller number is employed. The
as a working medium for theremoval of air by
main impeller casting 2 has a mounting ?ange
entrainment.
The charge of priming liquid may
28 which is adapted to be connected to a suitable
stand
anywhere
from the bottom of the inlet
supporting bell housing 29 for direct mounting 50
opening 41 to approximately the top of the open
on the end of a driving motor, or it may be con
ing'43 in the front plate 35, the amount of charge
nected to a suitable mounting bracket where the
required
depending upon the ability to maintain
pump is not supported on the driving motor. A
a complete sealed circulation during priming. In
gland pocket 30 to receive packing 32 is provid
ed in the gland boss 33 formed on the backplate 65 ordinary operation, sufficient liquid is trapped
after each operation of the pump to perform this
of the impeller body 2. Any suitable form of
function.
‘
seal for the shaft 5 may be provided. In the
In one form of the invention, an eight-bladed
Assume that the inlet connection 41 is con
nected to a suction hose which is sealed by the liq
The front of the impeller casing member 2 60 uid to be pumped. As soon as the power shaft 5
is operated at suitable speed, the liquid will be
provides a cylindrical recess in which the impel
pulled out of the inlet trap and discharged out
ler 4 operates, a suitable front plate member 35
of the impeller chamber into the separator I.
?tting into the said cylindrical recess, and hav
With the present improved arrangement of main
ing a ?ange 35, which is clamped against the
present case, a ?brous packing 32 and a follower
34 serve this function.
-
flange 1.
65
Separable C clamps 31, 31 connected by a
clamping bolt 38 are spaced at suitable intervals
around the periphery of the impeller chamber to
hold the parts together. These clamps engage
over suitable annular ?anges 39, 49 to keep the
clamps from slipping oil the edge of the parts .70
clamped together. It will be noted that the bolt
42 is disposed in an opening through the casting
.2 between the passageways I8 and I9. ‘
\
and priming throats, the pump will promptly
start up an orderly evacuation of air. It appears
that with the relatively light medium, consisting
of air and a small spattering of liquid, whatever
slight amount of mixture is thus formed has its
highest velocity and'tendency to discharge at the
region A, that is, the beginning of v the main
throat. Since the maximum constriction is sub
stantially at the very opening 8, and a slowing
down and expansion can occur immediately there
beyond, there is a tendency for any slight amount
. ~=The front plate 35'is formed as an integral part 75 of mixture which is discharged in the initial part
2,405,836
7
of the opening .A .to rise. and tendctogravitat'e up
in the .throat .18 ‘towards the :separator chamber
‘16. This ‘tends to inducea downward travel of
anramount ofliquid purely .bydisplacement, and
I conceive : that > some liquid . substantially free of
open bladed rotatable impeller and a stationary
pump body, the body comprising an impeller
housing and backplate member having atcircular
recess in which ‘the impeller is disposed for rota
tion concentrically in the recess, said ‘body pro
viding a separator chamber communicating with
air tends to :enterat the region B and'is imme
the inside of the impeller recess through two
diatelymixed with air. Some of itmay be dis
ducts substantially tangent to the inside periph
charged initially :into the throat 9, either with
eral wall of the recess, said ducts opening into
sufficient velocity to .cause a slight upwardcurrent
or perhaps merely sufficient-to blockreentry at 10 the impeller chamber through narrow slotlike
throat openings of less width than the Width of
the throat :9. .At all events, I havefoundthat
the blade tips of the impeller, the main throat
with. a pump constructed with the throat arrange
opening'being in advance of the priming throat
ment herein disclosed, the priming time for that
opening and being of approximately double'the
part which has heretofore been designatedasthe
area of opening of that of the priming throat
"priming stall” has been cut as much as 50%.
opening, said ducts each having an expanding
Compared‘with'the best previousarrangement of
cross section'from the throat to the separator, a
closure plate for the open side of the impeller re
stall has been cut, for example, from 120 seconds
cess having a central inlet opening and aninlet
to 60 seconds, and. even less.
.I am not able to state 'withcertainty that the 20 trap communicating with said latter opening.
2. A pump of the class described comprising a
above flow does ‘actually occur as I ‘have indi
rotatable open impeller and a stationary body,
cated, but it ismybelief that .itdoes. However,
the body comprising an .impeller housing and
I do .not wish to predicate theiinvention upon :a
backplate member having a circular recess in
theory,.but predicate the invention upon the prac
which the impeller is disposed for rotation, said
tical results which flow from this arrangement
member having a neck, a separator chamber at
of throats. The throats, it will be observed, are
the upperend of the neck, there being two pas
always ‘atleast ‘A; inch narrower than the blade
sageways substantially tangentially to the inside
tips which serve them. vAs shown in Figures '5
of said impeller recess extending upwardly
and 6, the main passageway expands from the
through the neck of the separator, said passage
throat 8 through the stages indicated at C, D and
ways opening adjacent each other on one side of
E according to the sections indicated at C’, D’, E’,
the center of said recess into said recess through
oppositethe positions that they occupy relative to
narrow slotlike throat openings of less width than
the length of the passageway. .In likemanner, at
the width of the blade tips of the impeller, the
thestagesRG and H, in the auxiliary passage
way l9,:the cross sections indicated at F’, G’, and 35 main throat opening being in advance of the
priming throat and being of approximately double
H’ illustrate theexpansion which is permitted to
the area of opening of that of the priming throat,
the flow of liquid in ‘the priming passageway.
a front plate closing the impellerrecess and hav
The priming throat and passageway being re
ing a central inlet opening and an inlet trap com
duced to substantially one half ‘of the like dimen
municating with said latter opening. ‘
sions of the main ‘throat, with approximately the
3. In a pump of the class described comprising
same rate of expansion, the efficiency of out?ow
the combination of a main‘body member, a trap
of these ‘.two'throats on liquid pumping isquite
and front plate body member, a separator body
comparable, and increase 'ofidelivery to include
member and a rotatable impeller provided with a
flow through the throat l9 does not'impair the
e?iciency of the pump. However, the relative~ 45 shaft; said main-body member having a circular
recess for receiving the impeller concentrically
ly ‘small .size of the vpriming passageway cuts
thereof and having a stuffing box for receiving the
down the .return‘?ow of: priming liquid on high
shaft of the impeller, said main body member
vacuumto a‘value whichpermits mixture to be
havingan integral neck disposed mainly ‘at one
formed ‘and effectively discharged through the
main throat during those stages of priming 50 side of the body, there being a substantially ver
tical main duct substantially tangential to the
characterized by high dry vacuum. In other
impeller recess at the side thereof, and an inclined
words, the throat 9 and its passageway l9 allows
substantially tangential priming duct at one side
the return of no more liquid than will effec
and near the top of the impeller recess, said ducts
tively'operate to. carry out gas until a high up
per limit ofsuction is reached. Hence,rthe pres 56 opening into the said recess adiacenteach other
and extending through said neck, the necklter
ent arrangement of throat provides rapid over
minating in a hat clamping surface around which
coming of the priming stall, preventslexcessive
there is a clamping flange; the second member
return ?ow on high vacuums whereby the pump
comprising a-circular front plate for closing said
can-evacuate gas rapidly to the'limit of its suc
tion, and the pump ‘shows ‘a remarkably high 60 impeller recessito constitute the same‘an impeller
chamber, said front plate having acentral inlet
pumping e?iciency when operating ‘upon liquid
opening, there being a vertically extending hollow
.alone.
trap body portion of substantiallyoblong cross
The ratio of the length of the priming throat to
~section,~the
upper end of which hollow trap body
‘that of the main throat,rassuming.the same width
has an opening, a cover plate and clamp for clos
of opening of each, gives best results-at .a value
ing said opening, there being a lateral inlet con
where the length of the priming throat is about
nection-at
the upper endof said-trap body por
'50%of that of. the main throat,»butithe relation
tion, an internalcircular ?ange in the trap-‘por
.is capable of attaining the desired results with a
tion below said inlet connection, a ‘ basketlike
reasonable variation, for example 10% on each
strainer embraced by said?ange and ‘being‘ re
side of the mean ratio of 50%.
movable through the upper opening in said trap
I do not intend to be limited to the details spe
body, the third member comprisinga substantial
ci?cally referred to, exceptas'they are made es
throating, the priming time including the ‘priming
sential by theappended claims.
I claim:
.
1. A pump of thei'class described, comprising an
ly cylindrical hollow separator body having a boss
with clamping flanges for cooperating with the
clamping ?anges of said neck, said boss being dis
2,400,830
posed mainly at one side of the said separator
body whereby the separator is substantially di
10
prising a disk-like front plate portion of conical
shape with a peripheral clamping ?ange and a
central inlet opening, a hollow body portion ex
rectly in vertical alinement with but disposed
mainly back of said ?rst body member, said boss
tending vertically from substantially the bottom
having a main duct substantially internally tan
of said inlet opening to a point substantially above
gent to the circular wall of the separator body
the top of the clamping ?ange and having a cir
and matching with the main duct in the ?rst body
cular opening at its top through which to insert
member, and having a priming duct leading from
and remove a cylindrical strainer basket, a lat
substantially the lowest portion of the hollow sep
eral inlet connection neck below said opening, and
arator body and matching with the priming‘ duct 10 a transverse wall at the bottom of said inlet con
in the ?rst body member, said separator body
nection having an aperture in line with and of
having an end wall disposed closely adjacent the
approximately the same size as said ?rst open
plane of said ducts and overhanging the ducts to
ing, and a cylindrical strainer basket disposed in
cause the discharge of mixture from the main
said latter opening and having a substantially
duct during priming to be forced endwise out of 15 closed bottom wall resting by gravity upon the
register with the priming duct in its travel around
bottom wall of the trap, said hollow body portion
the inner wall of the separator, there being a dise
being oblong in cross section with its major di
charge connection at the upper end of the sepa
mension in a direction parallel to the plane of
rator remote from said boss.
said front plate portion.
4. A self-priming pump having a horizontal im 20
6. The inlet trap and front plate member of.
peller shaft with an open impeller, a, body portion
claim 5 having an upwardly extending stud on the
comprising a concentric impeller chamber for said
bottom wall of said hollow body, and said basket
impeller having a central inlet and substantially
having an opening in the bottom ?tting loosely
tangential main and priming ducts disposed in
over said stud for holding the lower end of the
substantially the plane of the impeller, a hollow
basket against lateral displacement.
separator body having its front end disposed
7. For use in a self-priming pump, a hollow sep
above the impeller chamber and its major portion
arator body of substantially cylindrical form with
disposed to the rear of the impeller chamber, the
its axis horizontal and having end walls forming
front wall of the separator intersecting the line
heads, a discharge connection peek at the top of
of ?ow of ?uid from the main discharge duct to 80 the rear end of said body and a boss at the bottom
crowd the same to the rear, and an inlet trap
communicating with the inlet to the impeller
chamber and being disposed in front of said im
peller chamber, said impeller chamber being ?at
tened fore and aft of the direction of the im
peller shaft and having a lateral inlet connection
at its upper end, there being a circular opening in
the top of the trap for insertion and removal of a
strainer basket, a cover for the opening, a yoke
clamp for the cover, a cylindrical strainer basket
disposed in the trap below the inlet connection
and a transverse internal wall at the bottom of
the lateral inlet connection having an opening
through which the strainer basket extends.
5. An inlet trap and front plate member com-
of the front end and at one side of the center, a
substantially vertical main duct tangential to the
inner cylindrical wall of the body, a priming duct
disposed diagonally in said boss and opening into
the bottom of the body at the side of the center
opposite that into which the main duct enters,
said ducts lying in substantially the same plane
normal to the horizontal axis of the body, the bot
tom of said cylindrical Wall being ?attened to the
rear of said ducts for the purpose of damping the
swirling of liquid in the separator, the end wall
at the front being disposed in the path of the dis
charge stream from the main duct to crowd it
toward the rear of the body.
‘5
HARRY E. LA BOUR.
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