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Патент USA US2112575

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March 29, 1938'. ~
Filed NOV. 11, 1936
“m '
Patented Mar. 29, 1938
'um'rrn STATES
now srsnmzme pnvrcn
suenir. Richard, manta-1y. N. J.. assignor to
Ingersoli-Rand Company, Jersey (City; N. 1., a
corporation of New Jersey
, ‘Application November 11, 1936, Serial 1:... 110,213'
'2 Claims.
(Cl. 103-97)
This invention relates to pumps, and more
The ?gure in the drawing accompanying this
particularly to a ilow stabilizer for centrifugal s eci?cation is a longitudinal vertical view, part
pumps operating to-maintain a hydraulic pres;
sure in the line or element into which it dis
5 - charges.
ly'broken away, of a pumping system equipped
. with a ?ow stabilizer constructed and arranged
In pumping systems of this character,‘ the
pump-frequently continues to run at-i'ull speed
and during certain periods of its operation only a
suiilcient amount of water is discharged to pre
10_ vent excessive temperature rise of the water
in accordance with thepractice oi’ the invention. 5
' Referring more particularly to the drawing, 20
' designates a centrifugal pump, and 2| and 22 its -
inlet and discharge conduits,respectively. The
pump 2071s shown as‘ being of the. multi-stage
type having an'initial stage’ impeller 23 and a 10
within the pump. Obviously, when operating
' iinal stage impeller 24 which are mounted upon
under these conditions the pressure generatedby a shaft 25 journalled in bearings 28. ' The shaft
the pump impellers is higher than that generated
is suitably connected to the shaft 2‘l‘of a motor
28 whereby the rotary vparts of the pump are
when supplying maximum demand, and if, then
15 the discharge side of the pump is relieved, as by
opening a valve or valves, a severe pressure drop ~- Only fragmentary portions of the inlet and dis 15
may occur'at the inlet end of the pump. This _ charge conduits are shown, for convenience of
I is due to the inability of the water in the inlet illustration, and it is to be understood that the
conduit to accelerate its velocity quickly enough‘ discharge conduit 22 may form a part of a hy
draulic system from which the passage‘of liquid 20
20 to maintain the various pump passages filled.
With the valves closed the waterqin motion
within the pump is already at a velocity in excess
of normal and does not require acceleration
‘while the liquid on the‘ suction side is far below‘
25 its normal velocity and must, therefore, be ac-_
celerated when the discharge valve opens. Oth
erwise, the unbalanced pressures to ‘which‘the
rotativeparts of the pump become subjected will
cause vibration and frequently serious damage to 7
30 the pump rotor‘ and the casing-J;
' A further undesirable and frequently harmful
eifect ?owing from this condition of intermit
tently arrested velocity of the liquid on the inlet
side of the pump and the consequent unbalanced
_.35 pressures resulting when the discharge line is
1 opened is that when the liquid in the, inlet'con
cess of normalnthat upon its entrance into the
regionoi suhnormsl pressure asevere
40‘ impartedtotherotsting parts'andtothepump
‘may "be controlled'by suitable valv , so that,
in eifect, the pump may be said to discharge into
a closedsystem.‘ The discharge conduit 22. is,
however, provided with an oriiice 29 that con- ~
stantly discharges a sumcient amount of liquid to
assure circulation of liquid through the pump at
all times, and thus prevent undue heating of the
liquid within the pump during periods when ‘no
liquid is being discharged for its intended pur
In accordance with the practice of the inven- 30
tion, means are provided for assuring a readilyv
available supply of liquid and its prompt intro
duction‘or delivery to the inlet side of the pump _
whenever-1 the pressures within the passages'in 35
the pump and the impellers tend toward an un
balanced condition. "The means selected for il
lustrative purposes comprises a closed tank It
which is interposed in the inlet conduit 2|. The
tank 32 is arranged closely adjacent'the inlet 40
side ofthepumpsothatonlyaminimumlength‘
'or section of conduit II is required :to a?ord -
vention to prevent the occurrence of subnormal _' communication betweenv theinterior of the tank
pressuresinthevarious pump passages and con-" and the inlet chamber ii of the pump. The sec
' 45 sequently to avoid subiecting'the' pump parts to tions of the conduit II are preferably connected 4!;
undue strains and also to avoid the occurrence vclosely adjacent the lowermost portion 01' the
of a condition within the pump that may induce . tank-2Q and all the. liquid supplied ‘to the pump
' ‘ severe and harmful vibratory movement of the
pump :rotor.
50 . Another object is to assure .an immediately
available supply of liquid sdjacentthe inlet side
, of the pump suihcient to maintain the pump pas
sages constantly ?lled with liquid.
e Other objects will‘ he in, part obvious and in
as part pointed out
passes through the interior 22 of the tank which
- constitutes a storage chamber for liquid.
The tank “is of such capacity as to contain 50
an amount of. liquid sumcient, or in excess of that
required, ‘to maintain the pump
es thor- N
oushly‘?lled upon the occurrence of a sudden‘
demand upon the discharge sideruntil the velocity
.52mer'ste at which it nor-mam‘ ?ows when mans
?uid M‘, from the chamber is
through the port 81 into the upper portion oi’ the
passes from ;the discharge line for it's intended
To the end that the liquid in the storage cham
Ifthenthepressureinthedischarge conduitis
suddenly reduced the liquid in the ‘storage cham
ber s: mayhesuppliedtothepumpundernormal
ber "immediately ?ows into the passages of the
pump under pressure d maintains said passages
pressure, even though the velocity of the liquid
in‘ the conduit “leading to the storage chamber. adequately iilled. By suitably proportioning the
is below normal, the storage chamber is provided storage chamber 82 a sumcient supply or liquid
with! suitable valve mechaniam_ designated. in : may be delivered from the storage chamber to tleig
generaLTby SI, adapted to, admit gaseous ?uid pump through the brie! period of time requi
under pressure into the upper portion of the stor
age reservoir. which is. unvented. and above the
level of the liquid within the storage reservoir.
by the liquid in the portion of the inlet conduit ll
leading from the supply to gain its normal ve
locity., v
The valve mechanism It comprises a-casing as
having a chamber ll into which is introduced
15 pressure fluid by a conduit 30 which may lead
from a suitable source of
I claim:
. i. In a ?ow stabilizing device, the combination
ct a centrifugal pump and an inlet ‘conduit there- -'
, ?uid M11.
ior, a tank in the inlet line adjacent the inlet
Inthewaliodthechamber llisaportl'l which opening of the pump iorming a storage chamber
is controlled by‘ a needle vaive?slidahleinthe
.casing 84. The needle valve SI is actuated to the
open position byua ?oat ll having an arm II
which is pivoted at its iree end to thecasing I‘
a pin 43 carried by
'andhasaslotlltorec vsarm
II is preierahly
the needle valve 38. The
of L-shape and on the depending portion thereoi '
is mounted the ?oat member '0.
tor-"liquid and having an unvented upper portion,
‘and means operating in response to a predeter
mined maximum level of the liquid in the storage
chamber for introducing gaseous ?uid under pres
sure into the. storage chamber to accelerate the
now oi liquid irom the storage chamber into the
2. In a hydraulic system, the combination of
The operation of the pump is as follows: ‘Let it ‘.inletand, discharge conduits and a pump inter
be assumed that all the valves or outlets on the posed between the conduits and operating to
discharge side 0! the pump. other than the orifice maintain liquid under pressure in.the discharge
is‘, are closed. Under this conditionot operation
conduit, means interposed in the inlet conduit
the pressure .within the'discharge conduit II is. oi’ ' adjacent the pump iorming a storage chamber for
course, the same or higher than when the pump liquid, and means in the storage chamber actu
is discharging its full rated capacity and only an ' ated by a
maximum level 0! liquid
amount of liquid such as that which may pass in theistorags Lchamber for introducing gaseous
‘through the cruisers circulates through the pump
storage chamber to
so that the velocity of the water in the: inlet con- '» accelerate the (low oil liquid from the storage -'
duit ii is necessarily low.
- Let it further be assumed that. upon the initial
' > introduction oi liquid to the pump, the liquid rises
p‘ in the storage reservoir "until it reaches the
member». The needle valve v8! is’then opened‘
chamber into the pump upon the occurrence 0! a a
sudden reductio oi pressure in the discharge con
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