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Патент USA US2411728

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Nov. 26; 1946.
'
-
I w. L. ‘HUNTER
2,411,728
FEED WATER REGULATING APPARATUS FOR BOILERS
‘Filed Aug. 29, i944
I
2 Sheets-Sheet vl ‘
INVENTOR.
WILL/AN L. HUN TER
“W, 11 my
—
"
‘
ATTORNEY
Nov. 26, 1946.
w. |_. HUNTER
_
2,411,723
FEED WATER REGULATING APPARATUS FOR BOILERS
Filed ‘Aug. 29, 1944
2 Sheets-Sheet 2‘
/O7
.
106
IN VEN TOR.
WILL/HM L‘ HUN TER
BY i0.?TTOR/VEY
Patented Nov. 26, 1946
_
2,411,728
6
UNITED STATE 5
PATENT" OFFICE , '
2,411,728
FEED WATER REGULATING APPARATUSv
'
FOR BOILERS
William L. Hunter, Erie, Pa., assignor to North
ern Equipment Company, Erie, Pa., a corpora
tion of Pennsylvania
Application August a, 1944, Serial No. 551,694
9 Claims. (01. 122-4512.)
2
1.
This invention relates to feed water regulating
apparatus for boilers, and more particularly to
apparatus of this type which has distinct advan
tages When employed on marine boilers although 7
not limited to such use.
.
The present application is a, continuation in
part of the subject matter of United States Let
ters Patent 2,365,081, issued to me December 12,
1944.
'
As is well understood,v it is desirable to auto
matically regulate the feed water supply to boil
ers and maintain the boiler water level Within
pre-determined limits.’ This has commonly been
effected in stationary boilers by having a tube
or the like in communication with the steam and
water space of the boiler whereby the water level
in the tube will correspond to the water level in
the boiler and regulate the feed water Valve in
accordance with tube water level. "However, such
apparatus isnot satisfactory for marineboilers
since the tube water level is materially disturbed
by the roll of the. ship resulting in rapid and
highly undesirable ?uctuations in the amount of
feed Water being‘ fed to the boiler. ~
' '
I am aware that ‘it has previously been pro-, ~
posed to compensate for ship roll by‘ employing
type wherein the feed water valve is actuated re
sponsive to boiler water level variations 'or' is
actuated both in response to water level varia
tions andsteam ?ow variations in the .system.
Another objectof my invention is to provide
improved feed water regulating apparatus for
boilers which can be easily installed on a ‘con
ventional boiler and which is readily adjustable.
‘Other objects of the invention will be increas
ingly apparent from a. consideration of the fol
lowing description and drawings,
According to the invention, a generally V
' shaped tubeis mounted externally of the drum .
head of a boiler with the apex of the tube being
disposed substantially in alignment with the ver
tical center line of the drum head and the tube
arms extending at substantially equal angles at
each side of the center line. The apex of the tube
and the arm ends are connected to the water and
steam spaces of the boiler whereby in a stationary
boiler the water level in the'tu-be arms will cor
respond to boiler'water level. Each tube arm is
encased by a tube' sealed atthe top and-bottom
with the arm'for-ming chambers surrounding the
arms within which a volatile fluid is disposed. vA
connection extends from the encasing tubes to '
a‘ ?uid pressure motor actuating-"the feed water
two tubes cr-the like ?xed to each side of the
valve. The ?uid will volatilize in accordance with
boiler and laterally outward thereof whereby as
the relative amount'of steam and water in the
the boiler is tilted due to ship roll ‘a drop in water
level in one tube will be accompanied by a cor 30 tube arms or boiler water level and correspond
ingly operate the ?uid pressure motor and‘ feed
responding rise in the other tube. Both tubesare
adapted to in?uence the feed water supply so '
that a compensating effect is achieved with‘ a
relatively small angular ship roll. However, since
each tube is necessarily disposed a substantial
distance from the vertical center line of the boiler
water valve.
'
_
‘
When-the above described apparatus is em
ployed on a marine boiler the water level in one
arm‘ will drop and will rise in the other arm as
the boiler is tilted but the composite level will
considerable ?uctuation in-tube water level re
not materially change or effectlthe position of
sults and with considerable angular roll the tubes
the feed water valve. Due to the normal water
may be emptied or completely ?lled.
Practical
'levelin each ‘arm being only a short distance ‘lat
considerations limit the height orpextent ‘of the 40 ierally from‘ the vertical‘ center line of the drum
tubes and it is apparent that if the water level
head the ‘water level only fluctuates through rela
extended beyond the tubelimits that thecontrol tively small distances despite considerable an- I
of the feed Water willlbeerratic.
'gular .roll of the ship and well within the tube
-It is a primary object of my invention to pro- '
limits sothat an accurate control ofthe feed
vide improved feed water regulating apparatus 45
’ ‘J water is maintained.
for boilers.
V _
,
Another object of my invention is to provide
feed water regulating apparatus for boilers and
,
'
In a modi?ed form of the] apparatus a. second
‘i fluid pressure motor is provided which is re
which is particularly adapted to marine ‘boilers ‘:sponsive to {steam ?ow variations in the “system
whereby ‘an-accurate control of the‘ feed water'i =60‘ and the feed water valve’ is‘ controlled under. the
joint in?uence ‘of boiler water ‘level variations and
will be maintained responsive to the steam de
.
mands despite considerable angular roll 'ofv‘the ‘ ' steam ?ow variations, .
ship-
.
,
Another object of_ my invention is‘ to provide
.feed "water "regulating ‘apparatus "of‘the above
Infthe following description and drawings: i
‘Fig. -"1 is 1 an end elevational view of a boiler
‘5 drum‘ and "my improved regulating ‘apparatus
2,411,728
3
4
wherein a single pressure motor controls actua
tion of the feed water valve.
Fig. 2 is an end elevational view, largely dia
grammatic, of a modi?cation of my invention
wherein two pressure motors jointly control op
eration of the feed water valve.
Fig. 3 is a view generally similar to Fig. 2 show
ing a further modi?cation of my invention, and
Fig. 4 is a vertical section through the up
standing pressure motor of Fig. 3.
Referring now to the drawings, and particular
in generator ?uid pressure and causing the valve
to open more.
In a similar manner the valve
will be moved towards closing position as the
boiler water level rises.
When the boiler is tilted due to ship roll the
water level in one arm of tube l2 will be lowered
causing an increase in ?uid pressure in its asso
ciated generator tube 20 and the water level in
the other arm will rise causing a decrease in ?uid
pressure in its associated tube and the net result
is no appreciable change in ?uid pressure or no
ly Fig. 1, I have indicated at IU one end portion
appreciable change in valve position. It will be
or drum head of a conventional boiler. The nor
noted that at normal water level as indicated by
line H the level in each tube arm is only a rela
mal boiler water level is indicated by the line H.
A generally V shaped tube 12 is disposed with its
apex substantially in longitudinal alignment with
the vertical center line of the drum head and its
arms extending at substantially equal angles on
each side of the vertical center line. A pipe 13
connects the tube apex with a three way ?tting I4,
the ?tting communicating with the water space
of the boiler through a pipe (not shown) and
with a similar upper ?tting l5 through a level
indicator tube It. The arm ends are connected
by pipes l1 and It with the ?tting l5 which com- ‘
municates with steam space of the boiler through
a pipe (not shown). It will now be understood
that the tube [2 is in communication at the apex
and arm ends with the water and steam spaces
tively small distance laterally from the vertical
center line of the drum head and that the arms
' will not be completely ?lled or emptied despite
considerable angular roll of the ship thereby
maintaining an accurate control of the feed
water valve.
Although the apparatus may be supported in
any convenient manner I preferably support it
from the boiler by the pipes extending from ?t
tings l4 and [5 resulting in a simple installation
on a conventional boiler. Also, the position of
the valve piston for a given ?uid pressure may
be easily altered by adjusting nuts 33.
Referring now to Fig. 2, I have shown a modi
iication of my invention wherein two generator
of the boiler. Valves l9 control the ?ow of steam 30 type units are employed.
and Water to the tube and in a stationary boiler
A pair of ?uid pressure motors jointly operate
the water level in each arm of the tube will be
the feed water valve and each motor is inde
. the same and correspond to boiler water level,
pendently operated by one of the generator units.
‘Each arm of tube I2 is surrounded by a spaced
The V shaped generator unit 48 is similar to that
generator tube 28 preferably provided with fins
described in connection with Fig. 1 and varying
2|, the tubes being sealed at the top and bottom
?uid pressure is transmitted through a line 41
with the arms thereby providing an encasing
to a ?uid pressure motor $2 in accordance with
chamber 22 for each arm. Disposed within'the
boiler water level variations. Motor t2 may com
chambers 22 is a suitable volatile ?uid which
prise a pressure chamber 43 including a dia
being in heat exchange relation with each tube 40 phragm forming the base of the chamber and
arm will volatilize and create pressure in accord"
having its underside exposed to atmosphere. The
ance with the relative amount of steam and water
diaphragm is connected to a rod 44 and is ad
in each arm. The ?uid pressure is transmitted to
J'ustably loaded by a spring 46 encircling the rod
a ?uid pressure motor generally indicated at 253
having its lowermost convolution abutting the
through a pipe 24 communicating with each ~' base of a frame member 41 and its upper convolu
chamber 22 through a ‘Y connection 2% at the
tion abutting a plate 48 movable along the rod by
lower end of the chambers. The fluid pressure
nut 49 threaded to the rod.
motor actuates a valve controlling ?ow of feed
Frame member 41 preferably is formed with a
water through a supply line 21 for ‘the boiler.
circular base 5!, perforated to have rod 44 pro
The particular typerof ?uid pressure responsive ; jected therethrough, and an annular top ?ange
valve employed constitutes no essential part of
52 inter-connected by oppositely disposed arms
my invention but it may comprise a ?uid pressure
The diaphragm is sealedbetween ?ange 52
chamber formed by a dome shaped member 28
and the ?ange of a dome-shaped member 54-.
and a diaphragm 29 sealed between peripheral
The pressure motor is supported by a plate 56
?anges provided on member 28 and a lower mem
extending from the housing of the feed water
ber 3|. The diaphragm is connected to a valve
valve 57. Rod 44 is pivotally connected to a lever
stem 32 which operates the valve piston (not
58 which in turn is pivoted as indicated at 53
shown). The diaphragm has its underside ex
to an arm 61 extending from frame member ill.
posed to atmosphere and is balanced by a com
Lever 58 operates an arm 62 which is adjustably
pression spring 33 adapted to be adjusted by a 60 pivoted thereto.
plate 34 movable along guide rods 36 by manipu
A second ?uid pressure motor 63 is supported
lation of nuts 31. The valve stem is encircled
by plate 56 and is similar in construction to motor
by a stu?ing box 38 Which prevents water in the
42 but disposed opposite hand. Linkage similar
supply line from acting on the underside of the
to that provided for motor 42 operatively con
diaphragm.
v
‘
65 nects arm 64 with motor $3. A line 6% extends
It will now be understood that pressure exerted
from the chamber of motor 63 to a manometer
on the liquid in generator tubes 23 will be trans
unit generally indicated at 57 and controlling
mitted to the diaphragm whereby the valve will be
?uid pressure in line 56 responsive to steam ?ow
operated in correspondence with ?uid pressure.
variations‘in the system.
Under normal operating conditions or when the 70
The steam line 68 is provided with an ori?ce
boiler is stationary the liquid level in the arms
69 and a generally U shaped tube ‘ll including a
of tube I 2 will be substantially the same and
reservoir 12 is connected to the steam line across
correspond with boiler water level and as‘ the
the orifice. It is understood that the ori?ce is
level fails a greater amount of steam will be con
merely illustrative of any means causing pres
I tained in the tube arms resulting‘ in an increase.
sure dl?ferential during ?ow in the steam line.
2,411,728
cated at 98. Rotatably mounted in the lower
chamber is a shaft 99 which has "the near end
extended through the chamber wall and ?xed to
an arm I’OI disposed externally of the casing (Fig.
3). 'Also ?xed to shaft 99 and disposed within
the lower chamber is an arm I02 having its other
end .pivotally connected to a headed stem I83 en
gaging the under side of, the diaphragm. The
upper chamber .93 communicates by a pipe I04
Atube 13 encases a portion of tube ‘H and is
sealed thereto whereby a volatile liquid in vtube
13 will create ?uid pressure therein in accord
ance with the relative amount of steam and’ water
in the portion of tube 11 in heat exchange rela
tion with the ?uid in tube ‘I3. At no ?ow the
water level in both legs of U tube ‘H is the same
and corresponds to the elevation of the reservoir '
over?ow line. As steam flows through the ori?ce
a pressure differential is created ‘in the right hand 10 with the downstream or low pressure side of an
ori?ce L86 in the steam line I81. ‘The lower
'or'upstream leg of U tube TH and steam entering
chamber '94 communicates with the upstream or
this leg causes evaporation of a portion of the
‘high pressure side of the ori?ce through a pipe
?uid in tube 13 resulting in increased pressure
I98. The shaft 99 is suitably sealed with the cas
transmitted to the diaphragm of motor 63.
ing wall.
~
Reservoir ‘I2 acts primarily as a capacity tank
A second shaft I09 is rotatably mounted in the
whereby at maximum ‘load the liquid level in ‘the
lower part the motor casing with its new end
right leg of tube ‘II approaches the bottom of the
extended through the casing wall and ?xed to
leg and if the load is suddenly reduced the reser
an arm Ill disposed externally ofthe casing.
voir has sul’?cient capacity to fill the right leg of
the manometer with but small lossof level in the 20 An arm I I2 within the casing is?xed to shaft I99
and is pivotally ?xed to the stem I I3 of the valve
left leg. If the capacity tank were not provided
whereby as the shaft is rotated the valve piston
or the system had a uniform cross-sectional area
will be raised or lowered to control the flow of feed
upon a sudden ‘decrease in load the liquid level
water to the :boiler through the supply line I I4.
would even up in each leg but liquid would not
?ll the right leg and bring the regulator to the no
‘Rod 86
lever H6
by a link
‘links are
load position.
Arms 62 and 64 are adjustably and pivotally
connected to a lever ‘I'll which in turn is pivotally
connected to the valve stem ‘16. Movement of
the valve stem in a generally vertical direction
.armsby pins and are adjustable by disposing the
pins indifferent holes spaced along the lever and
will increase or decrease the flow of feed water
‘
' 32 forces rod 86 to- the right thereby forcing lever
I I6 in ‘a counterclockwise direction about the piv
described will force valve stem 16 downwardly to '
cause the feed water valve to open more. In a
oted connection with link I I1. Lever I I6 through
link III; will rotate arm 'I II and, shaft I99 in a
counterclock-wise direction. The rotation of
similar manner motor 53 will be operated upon
an increase in steam flow to move the valve in
Thus, the boiler water level
as r:
and steam ?ow control systems for the feed water
valve act independently and each produces the
proper working pressure without reacting in any
way upon ‘the other.’
Upon a rise in boiler water level the action will
water valve through link means but pressure dif- '
ferential in the steam line is transmitted directly
~
'
‘
i
_
Generator l8 transmits pressure through line
19 to fluid pressure motor iii in accordance with
boiler water level variations as described in ‘con
nection with Fig. 2.
7
‘Upon an increase in steam ?ow through line
Ill-‘I; ithe’pressure on ‘the underside of diaphragm
924s relatively increased and stem 193 moves up
wardly with shaft I99 and arm I02 rotating clock
wise. Link Ill moves lever H6 clock-wise about
the pivoted connection with rod 86 and link H8
rotates ar-m- m- and shaft I89 clock-wise. Shaft
I09 will lift arm I I2 and valve stem I I3 upwardly
‘
Referring now to Fig. 3,1 have shown an ar
a motor.
shaft I89 will rock arm I! 2 .and lift the valve stem
H3 to cause the feed water valve‘ to open more.
be‘ reversed. .
rangement similar to that'illus'trated in Fig. '2
in that two ?uid pressure motor-s operate the feed
to
arms.
The operation of the apparatus Will'be de
scribed. As the boiler water level drops in
creased pressure in line ‘I9 acting on diaphragm
to the boiler through the feed waterline 11. The
operation of the apparatus illustrated in Fig. 2
will now be described. Upon a decrease in'lboiler
water level the motor 42 through the link means
opening direction.
of motor BI is pivotally connected to a
which in turn is connected to arm IIlI
Ill and to arm III by a link II8. “ The
pivotally connected to the lever and
to increase the vflow of feed water. Upon a de
crease of steam flow through line I91 the action
This pressure acts'on a dia
will ‘be reversed.
.
‘
It will be noted that a reservoir H9 is inserted
phragm 82, loaded by a spring-89 bearing against
in both lines I89 and I8‘! serving as capacity
and adjustable by a nut 84 threaded to rod 86
tanks ‘whereby the liquid level variation in each
which has a headed rend engaging the diaphragm.
line due'to? movement of diaphragm 92 under
The diaphragm is sealed between a dome-shaped
member a1. and an annular ?ange of a'member
~ ‘pressure change caused by sudden load variation
88 having oppositely spaced arms inter-connect 60 in the steam line is relatively small.
ing the flange and a base through which the rod
~ Thus,.in both the arrangement of Figs. 2 and 3,
86 is projected. For illustration, the member 87‘
the feed vwater valve is jointly controlled by twov
and the ?ange of member 88 have been shown‘in
?uidpressu-re motors, and one motor isindepend
section. The motor is supported in any suit
able manner as by being bolted toa plate extend
ing from the feed water valve housing 89.
ently responsive to steam flow variations and the
65 other is independently ‘responsive to boiler water
level variations.
It will ‘be notedthat ‘the apex of the ‘V tube lies
‘substantially in a vertical plane through the
A second ?uid pressure motor ‘generally indi
cated at 9| is supported by thevalve housing 89.
As best illustrated in ‘Fig. 4, the motor casing is
divided by a diaphragm 92 into an upper sealed
chamber 93 and a lower sealed chamber 94. The
upper chamber is formed by a dome-shaped mem
to
longitudinal center line of the boilerlgdrum with
the tube arms extending at substantially equal
angles ‘at each side of the plane. Further the V
her 96 against which one end convolution of a .
tube is of a size to lie entirely within an area de
compression spring 91 balancing the diaphragm
?ned by the drum circumference, Also, the 'V
abuts. The base of thelowerchamber is indi
75 tube ispreferably mounted so that the arms exy '
2,411,728
‘I?
tend substantially equal distances above and be
8
low the normal water level in the boiler.
prising a generally V shaped tube having its
apex disposed substantially at the vertical center
Although I have shown and described preferred
embodiments of my invention I'contemplate that
stantially equal angles thereto, said tube being
line of the drum and its arms extending at sub
numerous and extensive departures may be made
connected to the water and steam spaces of the
therefrom without departing from the spirit of
my invention and the scope of the appended
drum at the apex and arm ends whereby boiler
water level will be communicated to the tube
arms,'a feed Water‘valve, a ?uid pressure motor,
'The invention is hereby claimed as follows:
a closed ?uid pressure system including a-volatile
1. Feed water regulating apparatus for boilers 10 liquid in heat exchange relation with the tube
comprisingr a boiler drum,’ a generally V-shaped
arms and communicating with the motor where
tube having its apex disposed substantially in
by the motor will be operatedin accordance with
longitudinal alignment with the vertical center
the composite water level in both arms, a second
line of the drum head and its arms inclined at
?uid pressure motor adapted to be independently
substantially equal angles thereto, connections
operated in response to steam ?ow variations, and
extending from the tube apex and arm ends to
link means operatively connecting both motors
the steam and water spaces of the boiler whereby
and the feed water valve.
the water level in each arm will be the same
6. The regulating apparatus as described in
with the boiler in normal position, a feed water
claim 5 and wherein the link means comprises a
claims.
'
valve, a ?uid pressure motor for operating the
valve, and a closed ?uid pressure system com
municating with the motor including a volatile
liquid in heat exchange relation with each arm
whereby the fluid pressure will be determined by
the composite water level in both arms and will
pair of arms each pivotally mounted on a different
motor and operable by its associated motor, a
pair of links each pivotally connected to a
different arm, a lever pivotally connected to both
said links, and the lever being pivotally connected
to the stem of the feed water valve whereby the
be relatively unaffected by tilting of the boiler.
2. Feed water regulating apparatus for boilers
lever may pivot about either link connection to
operate the valve.
7. The regulating apparatus as described in
comprising a boiler drum, a generally V shaped
tube having its apex disposed substantially in
claim 5 and wherein the steam line is provided
longitudinal alignment with the vertical center 30 with means creating pressure differential during
line of the drum head and its arms extending at
flow, a connection across said means comprising
substantially equal angles thereto, connections
a generally U form tube and a reservoir, a gener
extending from the tube apex and arm ends to
ator tube forming a chamber encasing the up
the steam and water spaces; of the boiler where
stream leg of the U tube and containing a volatile
liquid adapted to create varying pressure in ac
by the water level in each arm will be the same
with the boiler in normal position, a feed water
cordance with the relative amount of steam and
water in said upstream leg, and communicating
valve, a ?uid pressure motor for operating the
valve, a ?uid pressure generator comprising a
means extending from said generator tube to one
pair of tubes each sealed with an arm of the
of the pressure motors.
V tube and forming chambers containing a 4.0
8. The regulating apparatus as described in
volatile ?uid, and communicating means extend
claim 5 and wherein the second ?uid pressure
ing from the chambers to the motor.
motor comprises a pair of scaled chambers divided
3. The regulating apparatus as described in
by a diaphragm, means in the steam line creating
claim 1 and wherein the tube arms are disposed
pressure differential during flow, a conduit con
to extend substantially equally above and below
necting one of said chambers with the steam line
the normal boiler water level, and the arms are
upstream of said means, a second conduit con
inclined at an angle to have the normal water
necting the other chamber with the steam line
level therein a relatively small distance laterally
downstream of said means, and the diaphragm
of the tube apex whereby the water level will re
being operatively connected to the link means.
main within the limits of each arm despite con
9. Feed water regulating apparatus for boilers
siderable angular movement of the boiler.
comprising a boiler drum, a pair of upwardly
‘i. Feed water regulating apparatus for boilers
extending arms mounted on one drum head of
comprising a boiler drum, a generally V shaped
the boiler and lying within a periphery de?ned
tube mounted on a drum head of the boiler with
by the drum head, the upper ends of the arms
its apex disposed substantially in a vertical longi
being substantially equally spaced at opposite
tudinal plane through the center of the drum
head and its arms extending at substantially
sides of a vertical plane bi-secting the drum and
connected to the steam space of the boiler, the
equal angles on each side of said plane, con
lower ends of the arms being substantially equally
nections extending from the tube apex and arm,
spaced at opposite sides of said vertical plane bi
ends to the steam and water spaces of the boiler 60 secting the drum and connected to the water
whereby the water level in each arm will be‘the
space of the boiler, a feed water valve, a ?uid
same with the boiler in normal position, a gener
ally V shaped generator unit comprising closed
pressure motor for operating the valve, a closed
?uid pressure system communicating with the
motor including a volatile liquid in heat exchange
relation with each arm whereby the ?uid pressure
will be determined by the composite water level
in both arms and will be relatively unaffected by
tilting of the boiler, a second ?uid pressure motor
adapted to be independently operated in response
the chambers to the motor.
to
steam ?ow variations, and link means opera
70
5. The combination with a boiler drum, a steam
tively connecting both motors and the feed water
line extending from the boiler drum, a feed water
valve.v
'
supply line, and a feed water valve in the supply
WILLIAM L. HUNTER.
chambers encasing each arm and a volatile liquid
in the chambers adapted to volatilize and create
pressure in accordance with the relative amount
of steam and water in each arm, a feed water
valve, a ?uid pressure motor for operating the
valve, and communicating means extending from
line, of feed water regulating apparatus com
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