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Nov. 19, 1946.
F. M. PATTERSON
2,411,457
LOW WATER ALARM
Filed May 17,- 1944
'24
4/
)W70/MEMS.
Patented Nov. 19, 1946
l2,411,457
UNITED STATES PATENT OFFICE
2,411,457
Low WATER ALARM
Frank M. Patterson, Pitman, N.` J.
Application May 1v, 1944, serial No. 535,964
6 Claims.
(c1. 11s-_109)`
'i
The present invention relates to steam pres~
sure equipment and more particularly to a low
water alarm for steam boilers and the like.
Some of the objects of the present invention
are: to provide an improved apparatus for re
sponding to low water levels of a boiler as an
indication thereof, or as a means for assuring
prompt regulation of such level; to` provide a
simple and sure means of protecting a boiler
from low water conditions; to provide a device
wherein an axially movable shaft is arranged to
be shifted under a low water level to operate an
alarm; to provide means including a rotating
propeller within the boiler or water column for
causing an alarm to sound When'the boiler level
drops to a predetermined low; and t0 provide other
improvements asv will hereinafter appear.
In the accompanying drawing, Fig. 1 repre
Z
limits provided by the annular box 28 encircling,
the section 2'! and providing the necessary end
clearances.
.
For housing the turbine 24, a closure cap` 30
iits about the turbine and has threaded connec
tion with the. body I8. This cap 30 also forms
a bearing 3l for the end of the shaft and is made
pressure tight by a gland 32.. Steam is led to one
side of the turbine 24 by a port 33 leading from' ’
the interior of the column II', while an exhaust
port 34 is provided at the opposite side of the
turbine chamber.
`
»
For sounding an alarm when the boiler level
reaches low water, a bell 35 is mounted upon the
cap 30 to be in the path of the clappers 25 when
- the latter are in alarm, position, asV will beA ex
plained.
1
For bringing the` bellclappers 25 into striking
sents a longitudinal section of a low‘water alarm
relation to` the bell 35, a plunger 36 having a cone
embodying one form of the present invention; 20' shaped end is pressed against the end of the
Fig. 2 represents a` sectional detail on line 2-2
shaft I8 by a coil spring 3l bearing at. one end
of Fig. 1; Fig. 3 represents asection on line 3--3
against a. collar on the plunger‘and atV the other
of' Fig. 1; and Fig. 4 represents a side elevation
endA against` a» follower' 38 formed` as. a` part of a
of the device as installed on the water column of
feed screw 4B' threaded through a supporting arm
a boiler.
4‘I and operated by a knurled. head 42.
Referring to the drawing, one form of the
In operation of theA device. the steamA pressureA
present invention is shownl illustratively as used
maintains: theV turbine 24: rotating and as >long as.
as a low water alarm for boilers, though the
the propeller 23 is operating in the water in the
invention is not limited to the specific use since
boiler it will shift and hold the shaft I8 (to the
it is applicable to feed water regulators, high and 30 right as seen in Fig. 1) in a position overcoming
low water alarms, steam traps, drainers and other
the pressure of the spring 3l so that the clappers
pressure equipment. As shown, the device com
25 are removed from the path of the bell 35.
prises a body I 0 arranged to be attached in leak
When the level of the water falls below the proper
proof relation to the side of a water column
low point the propeller is then operating in a
II of a boiler I2, at a point in alinement with 35 steam area and its thrust becomes ineffective to
the low water level. Bolts I3 secure the body I8
overcome the spring pressure, and the latter then
to the column II and a gasket I4 is interposed
shifts the shaft I8 (to the left as seen in Fig. 1)
between the parts to make the joint pressure
and the clappers I8 now strike the bell 35 and
tight. The body IU has an extension I5 projecting
sound the alarm.
through an opening I6 provided in the column I I, 40 It will now be apparent that a complete unitary
and through which a bore Il extends axially
low water indicator has been devised wherein
through the body I0. This bore I 1 forms a journal
a positive and certain indication of a water level
for a shaft I8 passing therethrough and projecting
is obtained at all times and under all conditions.
at both ends thereof. This shaft I8 is lubricated
It should be noted that the propeller operates
and maintained pressure tight by a gland 20 of
to maintain the device ineffective as long as the
suitable packing material arranged to be forced
level is above the danger point but when the
into place by a supply duct 2| and feed screw 22.
level falls below such point the propeller being in
The end of the shaft I8, which enters the column
a steam area can no longer overcome the pres
Il, has a screw propeller 23 keyed thereon while
sure of the thrust spring whereupon the latter
the opposite end mounts a turbine 24 and a pair 50 actuates suitable alarm or other mechanism to
of bell clappers 25, the latter being carried by
result in the dangerous condition being corrected.
spring arms 26. The turbine 24 is mounted upon
While the turbine is here shown as driven by
a square section 2'I of the shaft I8 to transmit
steam it can, as an alternative, be driven by a
motion to the shaft I8 but the arrangement is
small electric motor or other means, as will be
such that the shaft I8 can slide axially within 55 understood.
2,411,457 ,
'
_, l.;
4
It will be understood that the device of the
tion when said level falls to bring said propeller
invention can be applied to any tank or vessel
having two mediums therein of different densi
ties which produce different reactions upon the
rotatable member of the device. Furthermore,
the shaft of the rotatable member can be ar
ranged vertically‘in the tank or vessel to be ver
into the steam space of the boiler, and means
operated Joy said shaft in alarm position to oper
ate said indicator.
4. In a low Water alarm for boilers, a screw
propeller in a vessel subject to boiler pressure, a
body attached exteriorly to said vessel, a shaft
rotatably and slidably mounted on said body
tically adjustablefor determining the level of
for mounting said propeller, said shaft being
the medium of greater density. In this form
a paddlecan ¿be used instead of a propeller and l0 moved by the propeller-in one direction when
immersedA in water, a spring for >moving said
the differenceV in resistance between rotation in’
shaft in the opposite direction when the pro
the two mediums taken as a measure of the liquid
peller is in the steam space, means for continu
level. By using an electrical' circuit an amme
ously rotating said shaft by fluid pressure Within
ter could indicate the variation in load when 15 the boiler regardless of level fluctuations, and
passing from one medium to another.>
_
means `operated by the shaft for indicating a low
Having thus described my invention, I claim:
Water condition.
l. In a low water alarm for boilers,.an indica- »
5. In a low water Ialarm for boilers, a screw
tor, an axially movable shaft entering the boiler I "
, propeller in a vessel subject to boiler pressure,
at a selected low water level, means for con
tinuously rotating said shaft by fluid pressure 20 a body attached eXteriorly to said vessel, a shaft
rotatably and slidably mounted on said body for
within the boiler'regardless of level fluctuations,
mounting said propeller, said' shaft being axially f
means operated by said shaft when the level
moved by the propeller »in one direction when>
falls below lsaid selected low water level for actu
immersed in water, a spring for moving said
ating said indicator, and means reacting to» the
water in the boiler to normally render said indi 25 shaft in the opposite axial‘direction when the>
propeller is in the steam space, means for con
cator operating means ineffective at levels above
tinuously rotating said shaft by fluid pressure
said low Water level.
'
within the boiler regardless of leve-l fluctuations,
2. In a low water alarm for boilers, an indi
" cator, an axially movable shaft entering the boiler
means operated lby the shaft for indicating a
at a selected low water level, means for continu 30 low Water condition, and means forming pressure
tight joints for said shaft and housing. ,
_
ously rotating said shaft by ñuid pressure Within >
the boiler regardless of level fluctuations, means
operated by said shaft when the level falls below
said selected low water level for actuating said
indicator, and means comprising a screw propel
ler on the shaft in the boiler to normally render
said indicator operating means ineffective at lev
els Iabove said low water level.
3. In a low water alarm for boilers,` an indica
6. In a low water alarm for boilers, an indi
cator, an axially movable shaft entering the boiler
at a selected low level, a' turbine keyed on said
shaft, means actuated by boiler pressure for con
tinuously operating said turbine to rotate said
shaft, a screw propeller on said shaft and Within
the boiler to react against the Water in the boiler
to maintain said shaftV in a position,correspond
tor, an axially movable shaft entering the boiler 40 ing to a safe water level, a spring -for movingk
at a selected `lovv level, means fo-r continuously
said shaft to an alarm position when said level
rotating said shaft by fluid pressure within the
falls below said selected low level tor bring said
boiler regardless of level fluctuations, a screw4 pro
propeller into the steam space. of the boiler, and
peller on the shaft within the boiler reacting
means operated by said shaft in alarm position
against the water to maintain said shaft in a 45 to operate said indicator.
n
‘
position corresponding to a safe water level, a
spring for moving said shaft to an alarm posi
FRANK M. PATTERSON. .
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