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Патент USA US2411729

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Nov. 26,1946.
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‘
7
.
w_ |__ HUNTER
2,411,729
FEED WATER REGULATING APPARATUS FOR BOILERS
Original‘ Filed April 14, 1942
>
2 Sheets-Sheet 1
47
IN VEN TOR.
W/LL/AM L. HUNTER
Nov. 26, 1946.
2,411,729
w. L. HUNTER
FEED WATER REGULATING APPARATUS FOR BOILERS
Original Filed April 14, 1942
.
2 Sheets-Sheet 2
YINVENTOR.
w/u mm L HU/V 75/?
Byw. x17MM,
HTTOIFNEV
Patented Nov. 26, 1946
S PATENT VOFFICE
uNlTEo
’
2,411,729
~
2,411,729
‘FEED WATER 'REGULATING APPARATUS
.
'
..
~gEORBOyILERS
.
'
William L. Hunter, Erie, Pa., assignor to North
ern Equipment Company, Erie, Pa., a corpora
tion of Pennsylvania
7 Original application April 14, 1942, Serial No. .
438,960, now Patent No. 2,365,081, dated Decem
ber 12, 1944. Divided and this application Sep
tember 20, 1944, Serial No. 554,997
V
.
(Cl. 122-451)
4 Claims.
I’
1
This invention relates to feed water regulat
ing apparatus for boilers, and more particularly
to apparatus of this type which has distinct ad
boilers which can be easily installed on a conven
tional boiler and which is readily adjustable.‘
ther objects of the invention will be increas
ingly apparent from a consideration of the fol
vantages ' when employed on marine boilers
‘ although not limited to such use.
lowing description and, drawings.
The ‘present invention is a division of my co
shaped tube adapted to expand and contract
under thermal change is mounted externally of
14, 1942, ‘which has become United States Patent
2,565,081, and which issued to me December 12,
44.
.
.
the drum head of a boiler with the apex of the
tube being disposed substantially on the vertical
'
As is well understood, it is desirable to auto
,
.According to the invention, a generally V
pending application Serial No. 438,960, ?led April
1
2
v'improved feed water regulating apparatus for
" center line of the boiler and the tube armsex
matically regulate the feed water supply to boil
ers and maintain the boiler water level within
tending at substantially equal angles at each side
of the center line. The apex of the tube is ?xed
and ends of the arms are free to move under ther
effected in stationary boilers by'having a tube
mal change. Each of the arm ends is connected
'01‘ the like in communication with the steam and
to separate rock levers which are pivoted later
water space of the boiler whereby the water level
ally of each'arm. A third'lever is pivoted to one
in the tube will correspond to the water level
of the rock levers and is pivotally connected to
in the boiler and regulate the feed water valve
the other rock lever by link means whereby ex
20
in accordance with tube water level. However,
pansion of one tube arm a given amount and con
such apparatus is not satisfactory for marine
boilers sincev the tube water level is materially ' traction of the other tube arm an equal amount
will e?ect no change in theposition of the third
disturbed by the rollof the‘ship resulting in rapid
lever. The apex of the, tube and the end of each
and highly undesirable ?uctuations in‘ the
25 tube arm are connected to the boiler whereby in
amount of feed water being fed to the boiler.
a stationary boiler the length of each arm will at
I’ am aware that it has previouslybeen pro
all
times be substantially the same, and will be
posed to compensate for ship roll by employing
determined by the boiler water level.
two tubes or the like ?xed to each side of the
When employed on a marine boiler one‘ tube
boiler and laterally outward thereof whereby as
arm
will expand and the other will contract in
the boiler is tilted due to ship roll a drop in water 30
accordance with the amount the boiler is tilted
level inone tube will be accompanied by a corre
froma normal position but the composite action
s'po'nding rise in’ the other tube. Both tubes are
will
not materially effect the position of the third
adapted to in?uence the feed water supply so
that a compensating‘ effect isiachieved with a ’ lever. Due to the normal water level in each tube
from the
relatively small angular ship roll. However; since 35 arm being only a short distance laterally‘
vertical center .lineoi the boiler the water level
each tube is necessarily disposed 'a substantial
only ?uctuates through relatively short distances
distance from the verticalicenter line of the boiler
despite considerable angular roll of the ship and
considerable ?uctuation in tube water level‘ re‘
well within. the tubelimits. In one embodiment
sults and with considerable angular roll the'tubes
‘movement
of the third lever controls the opera
may be emptied or completely ?lled. Practical
tion of the feed water valve jointly with a lever
considerations limit the height or extent‘ of. the
operable .byla ?uid pressuremotor but each said
tubes and it is apparent that if the Water-level
lever can actuate the valve independent of move
is extended'beyond the tube limits that the con;
ment'ofthe other lever; The ?uidpressure mo
vtr‘ol'of the feed water will be erratic.
tor is in communication withv steam pressure in
It‘ is a primary object of my invention to'pro
pr'e-determine'd limits. This has commonly been
vide improved feed .water regulating apparatus '
for
boilers.
-
V
4
.
,
___-Another object of my invention is .to provide
' feed water regulating apparatus for'boilers. and
which is particularly adapted to marine boilers
whereby an accurate control of the feed water
,will be maintained vresponsive to the'steamde
mands despitev considerable angular roll‘ of the
ship;
‘‘
‘
v
,
1
.
I
"
'
the boiler vand super-heater steam pressure at
‘opposite. sides of a diaphragm whereby the motor
. ‘lever will be actuated bypressure differential on
the diaphragm in ‘accordance with’ steam flow
variations in ‘the system.
'
-'
a
V
In a modi?cation of the invention, a pilot valve
is operated responsive to boiler water‘ level varia
tions which controls'a ?uid'pressure, motor autu- '
ating the feed water valve.
Ina new,
odi?catiortza?uisirressui‘e ino
3
2,411,729
tor operatively connected to the feed water valve
is controlled by a pilot valve responsive to the
composite e?ect of steam ?ow variations in the
system and boiler water level variations.
Each of the embodiments disclosed employ the
same general arrangement for actuating a ?rst
lever through a V shaped tube of thermally ex
pansive material, a pair of rock levers operable
by expansion and contraction of the tube arms
4
L form is pivotally connected to the top portion
of rock lever 22 and a link arm 28 is pivotally
connected to this lever, as indicated at 29, and
to the other rock lever l8 at 3|. A series of holes
may be provided along lever 2‘! to provide an
adjustable connection whereby for a given move
ment of either rock lever a greater or lesser
movement of lever 27 will be e?ected.
The operation of the apparatus so far de
and link means, the mechanism being arranged 10 scribed is as follows. Assuming the apparatus
so that the said ?rst lever and resultantly the
feed water valve is substantially unaffected by
tilting of the boiler.
In the following description and drawings:
Fig. 1 is an end elevational view largely dia~ '
grammatic, of a boiler and my improved regu
lating apparatus,
Fig. 2 is an end elevational view, largely dia
grammatic, showing a modi?cation of my inven
tion,
Fig. 3 is a right side view of the apparatus illus- ‘
trated in Fig. 2 with the fluid pressure motor and
?uid line omitted for clearness of illustration,
Fig. 4 is a view, generally similar to Fig. 2,
showing a further modi?cation of the invention, -:
Fig. 5 is a right side view of the apparatus for
Fig. 4,
Fig. 6 is a horizontal section taken along the
line 6—6 of Fig. 4, and
Fig. 7 is a vertical sectional view of a pilot valve
which I may employ.
Referring now to the drawings, and particu
larly Fig. 1, I have shown an embodiment of my
invention, wherein the end portion or head of a
to be used on a stationary boiler or on a marine
boiler disposed parallel to the fore and aft center
line of the ship and that the ship is riding at an
even keel, the water level in both arms of the
thermostatic tube will be the same and will cor
respond with boiler water level. Upon a decrease
in boiler water level there will be a, similar de
crease in both arms and an increase in the
amount of steam in each arm causing both arms
to expand an equal amount whereupon rock lever
l8 will be rotated in a clock-wise direction and
move lever 27 in a clock-wise direction. Rock
lever 22 will move in a counter-clock-wise direc
tion and further move lever 21 in a clock-wise
direction. In a manner to be explained this
movement of lever 2'! will cause the feed water
valve to move in an opening direction. An in
crease in boiler water level will cause a reverse
action but in each instance the action of the rock
levers will be cumulative rather than opposed.
If the apparatus is used on a marine boiler and
the ship is rolling the water level in each tube
arm will alternately rise and fall since frame I4
is fixed to and will move with the boiler.
As the
boiler drum is generally indicated at iii and flow
boiler is tilted in clock-wise direction the left
through the feed water supply line H is con
hand tube arm will be raised and the water level
trolled by a valve I2 which is connected to the
therein will be lowered causing the arm to ex
lower portion of the boiler drum by a line IS.
pand and resultantly lever 27 will tend to move
The regulating apparatus for operating the
in a clock-wise direction. However, the right
feed water valve responsive to boiler water level 40 hand tube arm will be lowered causing the water
and which is relatively unaffected by tilting of a
level therein to increase thereby contracting the
marine boiler will now be brie?y described, this
arm and tending to move lever 21 in a counter
apparatus being more fully described in my afore
clock~wise direction with the net result that lever
said Patent 2,365,031. A generally triangular
2'! is not appreciably effected by ship roll and an
shaped frame I4 preferably formed of iron or a
accurate control of the feed water is maintained
similar material relatively unaffected by thermal
change may comprise a pair of triangular shaped
spaced members of channel cross-section with
suitable cross spacing members therebetween.
However, since the frame is installed in a zone -
of relatively constant temperature it may be
made of any suitable material as its dimensions
remain practically constant. The frame may be
supported from the feed water line or in any suit
able manner.
Disposed between the frame mem- ..
hers is a thermostatic tube of inverted V form,
the apex of the tube communicating with a line '
l 6 extending to the steam space of the boiler and
being locked to the frame by a nut IT. The tube
arms are inclined at substantially equal angles to
the vertical center line of the drum head and are
of substantially equal length. The tube apex is
disposed at the vertical center line with the hori
zontal center line of the arms preferably slightly
below the normal water level of the boiler.
As best illustrated in Fig. 4-, a rock lever I8 is
pivoted between the frame members as indicated
at 19 and is pivotally connected to the free end .
of the left hand tube arm as indicated at 2| . A
second rock lever 22 is connected in a similar
manner to the free end of the right hand tube
arm and is pivoted as indicated at 23. The free
ends of ‘the tube are inter-connected by a pipe 24
which communicates with the water space of the
since the feed water valve is operated in accord
ance with movement of lever 21 as will be now
described.
' A strut 32 including tension relief means 33 is
pivotally and adjustably connected to lever 27
and is operatively connected to a fluid pressure
motor 34 actuating valve [2 by suitable link
means which may comprise a chain 36 reeved
through a pulleyS'l, ad-justably mounted on an
L shaped lever 38, and adjustably connected to
an arm 39. Lever 38 is fixed to and adapted to
actuate a shaft Ill which actuates the valve
plunger. Am 39 is operably responsive to steam
?ow variations in the system in a manner to be
described so that the valve is operated in response
both to boiler water level variations compensated
for ship roll and steam flow variations in the
system. Any suitable valve may be employed but
I preferably use a valve of the type more fully
described and illustrated in U. S. Letters Patent
2,270,094, issued to V. V. Veenschoten January
13, 1942.
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'
Arm 39 is operatively connected to a diaphragm
-(not shown) disposed in the upper portion of the
valve housing and ‘movable by di?erential fluid
pressure. One side of the diaphragm is subject
to steam pressure in the boiler by a line 42 and
the other side to superheater steam pressure by
a line 43 extending from the outlet 44 of the su
boiler through a pipe 26. A lever 27 of inverted 75 perheater 46. I preferably provide a capacity
2,411,729
5
generally similar’to the embodiment of Fig. 1,
tank or reservoir 41 in each line so that the liquid
wherein a servo-motor is employed and a pilot
level variation in each line due to diaphragm
valve responsive to the composite e?ect of steam‘
movement under pressure change will be rela
?ow variations in the system and boiler water
tively small. As is more fully explained in the
,level variations controls a ?uid pressure motor
aforementioned Veenschoten patent arm 39 op
operatively connected to the feed water valve.
erates lever 38 in accordance with the steam ?ow
The rock levers l8 and 22 and link arms '28 are
variations in the system and as previously ex
operated as previously described in response to
plained lever 21 operates lever 38 in accordance
boiler water level variations whereby an L shaped
with boiler water level variations so that the feed 10 lever 16 pivoted at the upper portion of rock
water valve is operated responsive to the com
lever 22 is rocked in a clock-wise direction upon
posite effect of steam ?ow variations and water
a decrease in water level and in reverse direc
level variations. A tension spring 48 having one
tion upon an increase in level. The upper por
end ?xed to the valve housing and its opposite
tion of lever 16 is slotted to receive an adjust
end secured to the depending arm of lever 38
ably mounted pin 11 which abuts the depend
maintains tension in the link means operating
ing arm of a lever 18 and is held thereagainst by
the feed water valve.
a pair of tension springs 8| connecting lever 16
Referring now to Figs. 2 and 3, I have shown a
modi?cation of the invention in which the frame
l4 and associated parts are mounted in ?xed
and an arm 19 extending from the frame l4.
Lever'18 has a horizontally extending arm 82
which is journaled on a pin 83 projecting from
relation to the drum head vof a boiler as ex 20 the depending arm- 84 of a bracket extending
plained in connection with Fig. 1 but in'this em
.from the housing of the ?uid pressure motor 86.
bodiment the lever 21 is replaced by a Z shaped
Arm 82 is perforated to receive a pin 81 which
lever 49.. Lever 49 is pivoted as indicated at 5|
is also projected through a link 88 and a pair of
to the upper end of rock lever 22 whereby asr tension springs 89 secured to the ends of the pin
previously explained a drop in boiler water level
and the pilot valve casing continuously urge pin
will cause lever 49 to be rotated in a clock-wise
81 in an upward direction.
direction and elevate the upper horizontal arm
Link 88 is slotted to receive an adjustably'
52 of lever 49. Tension springs 53 are connected
mounted pin 9| which pivotally connects the link
to the ‘lower horizontal arm 54 of lever 49 and
with an arm 92 ?xed to a shaft 93 rotatably sup
the frame l4. Arm 52 acts against an abutment 30 ported by the housing of ?uid pressure motor 86
56 slidably adjustable along a lever 51 pivotally
and having a portion sealingly projecting’into
mounted as indicated at 58 on a bracket 59.
the housing. An arm 94 within the housing is
Lever 51 is loaded by a pair of tension springs I 4
?xed to shaft 93 and is pivotally connected to
6| connected to the left hand, end of the lever '
a rod 96 secured to a diaphragm 91. The dia
and bracket 59. Abutment 56 preferably com
phragm is loaded on its upper side by a compres
prises a threaded element 62 for regulating‘the
sion spring. It is well knownthat steam ?ow
' spacing between arm 52 and lever 51 and re
variations. from a boiler may be measured by pres
sultantly the tension exerted by springs 53 and 6 I.
sure differential caused by resistance in the steam
Lever 51 bears against and actuates the ad
line such as a superheater, an ori?ce, Pitot tube,
justable stem 64 of a pilot valve generally indi
or friction through a section of the steam line.
cated at 63, the pilot valve being of the type
The diaphragm divides the housing into upper
adapted to produce a ?uid pressure proportional
and lower chambers and the lower chamber is
to stem displacement._ Pilot valves of this type
connected with the upstream or high pressure
are well known and in Fig. '7 a valve of this type
side of the resistance such as the superheater in
is diagrammatically illustrated wherein move
let through a line 98. The upper chamber is
ment of the stem 64 having spaced piston valves
connected to the downstream or low pressure
thereon controls entry of a ?uid under substan
side of the resistance being measured, such as
tially constant pressure from a port 65-to the
the superheater outlet, through a line 99.,
valve casing and also controls the passage of
‘The pilot valve'763 is similar to that described
excess ?uid through a port 66. The fluid may be
in connection with Figs. 2, 3 and 7 and line 68
air, city water or the like which communicates
leads from the pilot valve to the ?uid pressure
through port 61 and line 68 with a remotely dis
posed fluid pressure motor 69 adapted to operate
motor operating the feed watervalve. The motor
_
described in connection with
.may be of the-type
the feed water valve. The ?uid pressure motor
may comprise a chamber 1| having its base
Fig. 2.
The ?ow of feed water to the boiler is
formed by a diaphragm movably responsive to
?uid pressure changes. The diaphragm has its
lower side exposed to atmosphere and downward
controlled by the apparatus described in the fol
movement thereof under increased ?uid pressure
18 ‘in acounter-olock-wise direction about pin
lowing manner. As the boiler water level de
creases lever 16 will be rotatedin a clock-wise
direction and through pin 11 will rotate lever
in the chamber is opposed by a spring 12. The
diaphragm operates a stem 13 pivoted to the arm '
of a rock shaft 14 which projects within the valve
casing and byinternal linkage actuates the valve
piston in a Well known manner.
_
It will now be understood that I have provided
an arrangement wherein a pilot valve is oper
ated responsive to water level variations in the i
boiler, compensated for ship roll in a marine
boiler, the‘ pilot valve controlling transmission
of ?uid from a source under substantially con
stant pressure to a ?uid pressure motor oper
shown a further modi?cation of my invention,
valve to open more. Upon an increase in boiler
water level the action will be reversed and. the
70 stem 64 will be moved upwardly to move the feed
water valve in a closing direction.
ating theboiler feed valve in accordance with
?uid pressure. changes.
Referring low to Figs. 4 to 6 inclusive I have
83. Arm 82 of lever 18 will carry pin 81 down
wardly against the tension of springs 89 and cause
link 88 to rotate about pin 9| and permit pilot
valve stem 64 which it bears against to move
downwardly under the in?uence of the stem
spring. This movement of stem 64 causes a de
crease in ?uid pressure in line 68 whereby the
?uid pressure motor will cause the feed water
Upon an increase in steam ?ow in the system
. the arm 92 will be rotated in a counter-clock-wise
{(5
direction due to a relative increase in pressure
2,411,729
on the underside of diaphragm 91 and this move
ment will carry pin 9! upwardly causing link 88
to rotate clock-wise about pin 87 and permit the
stem 64!- of the pilot valve to move downwardly
which will cause the feed water Valve to open
more as previously described. Upon a decrease in
steam flow in the system the action will be re
versed to move the feed water valve towards a
8
2. Feed water regulating apparatus for boilers
comprising a boiler'drum, a generally V shaped
thermostatic tube having its apex ?xed relative
to the drum and, substantially at the vertical cen
ter line of the drum, the tube arms extendingat
substantially equal angles to said center line and
being freely movable under thermal change, one
end of each arm communicating with the steam
closed position. Thus, the pilot valve and re
space of the drum and the opposite end with the
sultantly the ?uid pressure motor controlled 10 water space thereof whereby the water level in
thereby and actuating the feed water valve is reeach arm will correspond with boiler water level,
sponsive both to boiler water level variations and
a feed water valve, a valve operating lever, a ?uid
steam flow variations in the system.
pressure motor operably responsive to steam flow
It will be noted that in all the embodiments
Variations in the system, a lever movably respon
described a lever (lever 21 of Fig. 1, lever 49 of
sive to the composite thermal change in the tube
Fig. 2, and lever 16 of Fig. 4) is actuated respon
arms, and link means inter-connecting said lever
sive to boiler water level variations but that the
with the motor and valve operating lever whereby
lever is relatively una?ected by tilting of a marine
the feed water valve will be operated under the
boiler in alternate directions about an axis ex
joint in?uence of steam ?ow variations and boiler
tending longitudinally of the boiler. Movement 20 water level variations.
of the lever correspondingly controls or effects
. 3. Feed water regulating apparatus for boilers
operation of the feed water valve in association
comprising a boiler drum, a generally V shaped
with a ?uid pressure motor. In the embodiments
thermostatic tube having its apex ?xed relative
of Figs. 2 and 4 a pilot valve is employed for con
to the drum and substantially at the vertical cen
trolling the operation of a ?uid pressure motor 25
ter line of the drum, thetube arms extending at
actuating the feed water valve and in the em
substantially equal angles to said center line and
bodiments of Figs. 1 and 4 the feed water valve is
being freely movable under thermal change, one
actuated both in response to boiler water level
end of each arm communicating with the steam
variations and steam ?ow variations. In the
space of the drum and the opposite end with the
embodiments of Figs. 1 and 4 it will be noted that
water space thereof whereby the water level in
although the feed water valve is jointly controlled
each arm will correspond with boiler water level,
by the boiler water level and steam ?ow responsive
a feed water valve, a ?uid pressure motor for
means that each means is adapted to indepen
actuating the feed water valve, a pilot valve con
dently actuate the valve. For example. if the
trolling operation of the valve motor, means con
boiler water level responsive lever 21 of Fig. l or
trolling operation of the pilot valve, said pilot
arm 82 of Fig. 4 remains stationary the valve will
valve controlling means comprising a servo-motor
be actuated responsive to the steam demands of
responsive to steam ?ow variations in the system,
the system. Conversely, if the steam ?ow is con
a lever movable in accordance with the composite
stant lever 39 of Fig. 1 or arm 92 of Fig. 4 will
water level in the tube arms, and means oper
remain stationary and the valve will be actuated
atively inter-connecting the servo-motor, pilot
responsive to boiler water level variations.
valve, and lever whereby the feed Water valve will
~ Although I have shown and described preferred
be operated under the joint influence of steam
embodiments of the invention I contemplate that
?ow and water level variations and independently
numerous and extensive departures may be made
of concurrent variation.
.
therefrom without departing from. the spirit of
4. Feed water regulating apparatus for boilers
my invention and the scope of the appended
comprising a boiler drum, a pair ofarms formed
claims.
of thermally expansible material mounted on one
The invention is hereby claimed as follows:
head of the boiler drum and lying within the
1. Feed water regulating apparatus for boilers
head periphery, the arms being of substantially
comprising a boiler drum, a generally V shaped
equal length and each extending above and below
thermostatic tube having its apex ?xed relative
the normal water level in the drum, the arms
to the drum and substantially at the vertical cen
being substantially symmetrically disposed at op
ter line of the drum, the tube arms extending at
posite sides of the vertical center line of the drum,
substantially equal angles to said center line and
the upper end of each arm communicating with
being freely movable under thermal change, one
the steam space and the lower end of each arm
end of each arm communicating with the steam
communicating with the water space of the drum
space of the drum and the opposite end with the
whereby the water level in each arm will corre
Water space thereof whereby the water level in
spond with boiler water level, the same end of
each arm will correspond with boiler water level,
each arm being ?xed and the opposite ends being
a feed water valve, a ?uid pressure motor adapted 60 freely movable under thermal change, a ‘feed
to actuate the valve, means connected to the
water valve, a ?uid pressure motor adapted to
free end or each tube arm and to the motor for
actuate the valve, means responsive to the com
actuating the valve in accordance with the com
posite movement of the free ends of the arms and
posite water level in the tube arms, and means
connected to the motorv for operating the valve,
responsive to steam flow variations in the system
and means responsive to steam ?ow variations
for operating the motor independently of the level
in the system for operating the motor.
responsive means.
WILLIAM L. HUNTER.
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