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Патент USA US2370103

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Fèb. 20, 1945.
N. F. ZAPF
2,370,103 v
INDICATING MEANS FOR PUMPS
Filed July 15, 194s
[email protected]
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2,370,103!
Patented Feb. 20, 1945 `
UNITED STATES PATENT OFFICE
INDICATING MEANS FOR PUMPS
Norman .F. Zapf, Milton, Mass., assigner to
Manning, Maxwell & Moore, Incorporated, New
York, N. Y., a corporation of New Jersey
Application July 15, 1943, Serial No. 494,797
12 Claims. . (Cl, 10S-1)
indicating means of the present invention is here
illustrated las housed within a casing 5 compris
ing a hollow body portion 6 (which `may be a
This invention ,pertains to indicating means
and relates more particularly to means for indi
cating whether or not a fluid driven pump is
casting) having a removable bottom plate 6a, and
effectively operating. While of more general
utility the device is herein illustrated by way of
example 'in its application to the feed ‘water sys
a removable top plate or cover 'l secured in place
by bolts 8. As illustrated, this cover 1 is pro-_
vided at its center with a screw-threaded open
ing 9 which receives one end of a pipe I0 lead
ing from the feed water delivery pipe 3 at a point
between the oriñce 4 and `the boiler.
tem of a locomotive boiler.
Heretofore there has been no effective appa
ratus available for >informing the locomotive en
gineer or fireman whether, at any given instant,
the boiler feed apparatus (pump or injector) is
The lower part of the side wall of casing mem- n
ber 6 is providedwith an internally screw-thread
ed opening I'I which receives one end of a pipe I2
leading lfrom the water delivery _pipe 3 at a point
purpose. However, it is desirable and in fact
necessary that the operator be informed at once 15 between the pump and Athe oriñce 4. The hollow
casing 5 deiines a large `chamber I3 in which is
after he has performed the proper manipulations
arranged a "pressure-responsive movable dia
for starting the pump, whether, in response
phragm device, here shown as a metallic bellows
thereto, the pump is actually delivering >water in
I4, one end of which is -`iixed leak-tight to ‘the
suflicient volume.
cover 'I 4so 'that the interior of this bellows is in
The principal object of the present'l invention
actually delivering water Íto the boiler, the usual
water level gauge being wholly unreliable for this
is to provide indicating apparatus operative 'to
communication with -the `pipe I0. TheÍ opposite
indicate `whether or not water at effective pres
sure is being delivered by such a pump. A fur
end-,of ’the ‘bellows is closed by `a rigid head I4a
from the center of which projects a >bracket I5
carrying a pivot pin I6 which engages one end of
a lever Il. This lever is fulcrumed at its oppo
site end lon a pin I8 carried by a bracket I9 fixed
to the wall of the casing member B; i
-The casing member 6 is provided with an ex
ther object is `to provide indicating means oper
ative to show -whether vsteam is being supplied ‘to
the pump. A further object `is to provide indi
cating means of simple, reliable, and accurate
type useful, wherever a fluid delivery pump is
driven by pressure fluid, to indicate to the oper
ator whether or not the pump is in effective oper
ation. Other and further objects andradvan
tages of the invention will be pointed out herein
after in the following more detailed description
and rby Areference to the accompanying ydrawing
wherein
Fig. 1 is a fragmentary, diagrammatic view
illustrating portions of a boiler .feed system hav
ing the indicating means of the present inven
tion embodied therein;
Fig. 2 is a side elevation of a casing .forming
a part of the indicating means of the present in
vention; rand
,
Fig. 3 is a `section substantially on the line 3--3
of Fig. 2.
Referring to the drawing, the numeral I desig
nates a steam supply Apipe leading from a boiler
(not shown) to the boiler feed pump 2. This
feed pump vmay be of rany .acceptable `type and is
not here shown in detail. From this pump a
water delivery pipe 3 extends to the boiler. At
a point between the pump `and boiler this »pipe `is
provided with an oriñce 4 so designed as to cause
a substantial difference in pressure at 4its loppo
ternal
,
boss
21D
having
a
screw-’threaded
socket 2| which receives one end of a vpipe 22
leading from the steam supply pipe I. The
threaded bore 2| in the boss 2U communicates
wit-h a chamber 23 within the thickness of the
Wall vof the casing member 5, the lower part of
this chamber 23 having mounted therein a re
movable valve seat bushing 24 ‘having an axial
passage Whose lower end is defined by an annular
valve seat with which- cooperates a conical valve
member »25, here shown as integral with the up
per end of a vertically slidable valve stem 21 sur
rounded by packing 28 held under lcompression
by a gland 29. The -lower end of the valve stem
2l is pivotally »connected to the lever Il so that
as the lever moves up and `clown the vvalve '.26 is
moved 4.toward lor from its seat. The axial pas
sage through the valve bushing 24 communicates
(when the valve is unseated) with a chamber 29
below the bushing, said chamber communicating
with a, screw-threaded bore 3B, in the boss 20,
which receives one end of a pipe 3| leading to the
locomotive cab lor other convenient point of ob
servation where it terminates in a telltale pipe 32
(preferably downwardly directed) open to the
atmosphere.
site sides when water is flowing through the pipe.
It will be noted that as thus constructed, the
The controlling mechanism included in the 55
2
2,370,103
apparatus provides for exposure of the interior
of the bellows I4 to the delivery pressure of the
water in the pipe 3 at a point between the orifice
4 and the boiler, while at the same time the outer
surface of the head member I Ila of the bellows
is exposed to the delivery pressure of the water in
the pipe 3 at a point between the pump and the
pressure indicator responsive to compressed air
and which would show visually or otherwise
whenever air was being admitted to the gauge or
its equivalent through the pipe 3l from the source
of supply.
While one desirable embodiment of the inven
tion has been illustrated by way of example, it is
to be understood that the invention is not nec
oriñce, the latter pressure being somewhat high
er, when the water is iiowing in full volume, than
essarily limited to this precise embodiment, but is
10 to be regarded as broadly inclusive of any equiva
the pressure between the orifice and the boiler.
When the feed pump is not in operation the
lent constructions falling within the scope of the
lever I‘I tends to swing downwardly by gravity,
appended claims.
I claim:
1. In combination with a fluid delivering pump
assisted by the resilient tendency of the bellows
I4 to expand, but if the valve 26 is not thereby
unseated the next subsequent admission of steam
into chamber 23 will positively unseat the valve.
'When the feed pump is to be started the operator
opens a valve (not shown) designed to admit.
steam from the boiler to the steam supply pipe
I. Assuming that the valve 26 isunseated at this
time either by gravity or the steam pressure
above it, steam from the steam supply pipe I
immediately flows through the pipe 22 into the
chamber 23, thence through the bore in valve
bushing 24, and past the open valve into the
chamber 29, and thence through the pipe 3l to the
telltale 32 from which it escapes as a visible
plum'e into the atmosphere, thus notifying the
driven by pressure fluid delivered to it by a supply
conduit, indicating means comprising a movable
part whose position is determined by differential
fluid pressures at spaced points in the pump de
livery conduit, and a valve actuated by said
movable part and operative to permit or to cut off
the flow of pressure fluid from said pump supply
conduit to a point of observation.
2. In combination with a steam driven water
pump to which steam is furnished by a supply
pipe, indicating means comprising a movable
part whose position is determined by the pres~
sure of water in the pump delivery pipe, and a
valve actuated by said movable part operative to
operator that boiler steam has been admitted
permit or to cut off the delivery of steam from
to the supply pipe E. Until the pump starts and 30 said supply pipe -to a point of observation.
becomes effective to deliver water in volume
3. In combination with a steam driven pump
through the pipe 3 this ñow of steam outwardly
to which steam is supplied by a conduit, indicat
through the telltale continues. However, when
ing means comprising a movable parts whose po
the pump actually builds up effective delivery
sition is determined by differential fluid pressures
flow in the pipe 3 there results, by reason of the
at spaced points in the pump delivery conduit,
orifice 4, a differential pressure in the pipes I0 and
and a valve actuated by said movable part opera
I2, the parts being so designed and arranged
tive to permit or to cut off the delivery of steam
that when such differential pressure has been
from said supply conduit to a point of observa
established, the bellows head Illa will be forced
tion.
upwardly by the excess pressure in the chamber
° 4. In combination with a steam driven water
I3, thus seating the valve 26 and cutting off
pump to which steam is furnished by a supply
communication between the pipes 22 and 3|.
pipe, indicating means comprising an indicator
The escape of steam through the telltale thus
pipe open to the atmosphere at a point of obser
immediately ceases, thus indicating to the op
, vation, a movable part whose position is deter
erator that the pump is in effective operation.
mined by differential water pressures at spaced
If the pump should stop or if anything should
points in the pump delivery conduit, and a valve
stop the flow of water through the pipe 3, the
actuated by said movable part operative to per
valve 26 is again unseated and the escape of
mit or to cut off the delivery of steam from said
steam through the telltale notiñes the operator
supply pipe to the atmosphere through the in
that something has gone wrong with the feed
dicator pipe.
apparatus.
5. In combination with a steam driven water
When, after a suitable period of operation, the
pump to which steam is furnished by a supply
operator shuts on” steam from the pipe I, the
pipe, indicator means comprising a telltale pipe
pressure in the pipe 3 at opposite sides of the
open to the atmosphere at a point of observation,
oriñce 4 tends to become substantially equal,
a movable diaphragm exposed at opposite sides
since there is no longer an effective volume of
to the pressures subsisting at spaced points re
huid flowing through this pipe, and thus the
spectively in the pump delivery pipe, and a valve
lever Il is permitted to resume its normal posi
actuated by said diaphragm and operative to de
tion in which the valve 2S is unseated in readiness
60 termine the delivery of steam from said supply
for a repetition of the cycle of operations.
pipe into the atmosphere through the telltale
While the device as above described is particu
pipe.
larly useful in connection with the feed water
6. In combination with a steam driven pump
system of a locomotive boiler, it is obvious that
having a steam supply pipe, indicating means
it might equally well be applied to the feed water 65 including a telltale pipe open to the atmosphere
system of any type of steam boiler. Likewise the
at the point of observation, an oriñce in the pump
apparatus may be applied to any system wherein
delivery pipe, a movable diaphragm exposed at
opposite sides respectively to the delivery pipe
a pump driven by a pressure ñuid, is designed to
deliver anothel` fluid through a delivery pipe
pressures at opposite sides of the diaphragm, a
against a back pressure. For example, the pump 70 valve controlling a passage leading from the
might be a water pump for supplying a. reser
steam supply pipe to the telltale pipe, and con
voir and the pressure ñuid for operating the pump
nections for transmitting motion from the dia
might be compressed air, but in the latter event
phragm to the valve, the diaphragm being oper
it is obvious that the telltale device hereinabove
ative so to position the valve as to admit steam
referred to would be replaced by a gauge or other 75 to the telltale pipe from the steam supply pipe
3
2,370,103
whenever the pressure differential at opposite
ting motion from the movable wall of said ex
sides of the diaphragm falls below a predeter
mined value.
4so constructed and arranged that the valve is
pansible chamber to the valve, the parts being
closed whenever a predetermined pressure dilîer
ential is established at opposite sides of the ori
flce.
9. In combination with a fluid driven pump
having a delivery pipe and a pipe for supplying
driving fluid for operating the pump, indicating
posed to the ñuid pressure subsìsting at the de 10 means normally operative to reveal the presence
of pump driving ñuid in the supply pipe, and
livery side of the orifice in the pump ,delivery
means responsive to the presence of iiuid under
pipe and the exterior side oi' the bellows head
pressure in the pump delivery pipe to terminate
being exposed to the fluid pressure subsisting at
the operation of the indicating means.
the other side of the oriñce, a valve which con
10. A fluid actuated liquid pump having a de
trols a passage leading from the steam supply
livery pipe, a pipe for supplying driving'fluid to
pipe to the telltale pipe, and connections for
the pump, indicating means normally operative
transmitting motion from the bellows head to the
to reveal the presence of iiuid in said supply pipe,
valve, the parts being so constructed and ar->
and means including a movable part Whose posi
ranged that whenever steam is supplied to the
pump it is admitted to the telltale pipe, but only 20 tion is determined by differential pressure at
’7. In combination with a steam driven pump
having a steam supply pipe, indicating means in
cluding a telltale pipe open to the atmosphere at
the point of observation, an oriñce in the pump
delivery pipe, a metallic bellows having a mov
able head, the interior of the bellows being ex
spaced points in the pump delivery pipe to pre
until a predetermined pressure differential has
vent operation of the indicating means while liq
been built up between opposite sides of the ori
uid is being delivered under pressure by the
fice in the pump delivery pipe.
pump.
,v
8. Indicating means for use in a system where
11. In combination with a steam driven boiler
in fluid is delivered by a pump against a back 25
feed pump, a pipe for supplying steam to the
pressure through a conduit and wherein the
pump for driving the latter, a conduit leading
pump is driven by pressure fluid supplied to it
from the steam supply pipe to indicating means
through a pipe from a pressure source, said in
constructed and arranged to show the presence of
dicating means including an oriñce in said con
duit operative to establish a differential pressure 30 steam in said conduit, and means operative in re
sponse to delivery of Water under pressure by the
at its opposite sides, when ñuid is flowing in the
pump to stop the admission of steam to said con
conduit, a casing having therein a cavity which
always communicates with the conduit at one side
duit.
'
12. In combination with a steam driven boiler
of the oriñce, the casing having therein an ex
pansible chamber provided with a movable wall 35 feed pump, a pipe for supplying steam to the
pump for driving the latter, a conduit leading
which is externally exposed to the pressure in
said chamber and whose interior is exposed to
from the steam supply pipe and opening to the
the pressure which subsists in the conduit at the
opposite side of the orifice, means providing a
passage leading from the pressure fluid supply
pipe to a point of observation, a valve control
ling said passage, and connections for transmit
atmosphere at a point of observation, and means
operative in response to the pressure of water
delivered by the pump to stop the flow of steam
through said conduit.
NORMAN F. ZAPF.
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