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Патент USA US2404849

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,J. L. KIMBALL
‘
REGULATOR
Filed Nqv.‘l, 1944
2 sheetsfsheet 1
INVENTOR.
yam“ ?W
Iv. L. K m B A L L.
R E G UM T O R
Filed Nov. 1, 1944
2 Shegts-Sheet 2
INVENTOR.
Patented July 30, 1946
' 2,404,849
UNITED STATES PATENT OFFICE
2,404,849
REGULATOR
James L. Kimball, Danvers, Mass., assignor to
Ruggles-Klingemann Mfg. (30., Salem, Mass.
- Application November 1, 1944, Serial No. 561,445
5 Claims.
(01. 121—41)
1
2
My present invention relates to regulators of
the general character described and claimed in
Patent No. 2,378,410 of June 19, 1945.
follow-up members. The quick throw arm being
broken away to show vpivot point of the follow
One of the objects of my present invention is
in simplifying the construction and in making
more effective the step action operation as dis
closed in the above referred to patent. Another
object is in disclosing improved means for con
trolling dampers, valves and other pressure or
up member.
r Fig. 4 illustrates the action of the cam in op
erating the quick throw arm when the servo mo
tor is operating in an upward direction, and Fig. ‘
5 illustrates the action of the cam in operating
the quick throw arm when the servo motor is op_
erating on the downward stroke.
temperature control devices. This improved step 10 My invention is applicable to any type of ?uid
pressure operated regulator and is preferably
action regulator was primarily developed for the
adapted to regulators having what is commonly
operation of drum controllers and the like, used
referred to as a follow-up return method of com
in ‘the operation of variable speed motor control.
pensated control, the principal object of the in
The object being to avoid slow movement of the
servo motor and consequent burning of the con
tact ?ngers.
However, experience has shown
15 vention being accomplished by a novel additional
control preferably associated with the follow-up.
Referring to Fig. 1', D designates a damper; V,
that the invention with certain novel changes as
disclosed in my present invention is equally use
a valve; and R, a rheostat; these constitute main
control members for controlling variations in a
ful in preventing hunting action due principally
to response lag.
20 ?uid system, one or all of which may be operated
from my improved ‘regulator as required.
Due to transportation lag of a ?uid system
4 I will now describe the operation of a regulator
under regulator control, there will result a re
of the type embodied in my invention, ‘having a
sponse lag between the correction of a de?ciency
by the control means, such as a damper valve or
follow-up return motion control,
rheostat and the appreciation of such correction
by the regulator. Such response lags, including
that of the regulator, are the principal cause of
A cable, chain, or other connecting means 2 ex
tends over shives 5 and -5' and is operatively con
nected to levers or other operating means of the
sustained hunting action. As an example, as
suming a case of damper control in boiler oper
damper D, valve V, and rheostat R. A counter
weight W operates these main control members
ation, the time lag between the adjustment of 30 in one direction only. The cable or other con
necting means is secured to a link '6 at the upper
the damper and the result of such adjustment in
end of piston rod 1.
‘
the correction of the steam pressure will ordinar
Piston rod 1 has a piston 8 at its lower end
ily result in an over correction by the damper
which is adapted to reciprocate in cylinder 9 and
controlling means, in other words, the return mo-.
vtion of the conventional follow-up will be too 35. constitutes a ?uid pressure servo-motor having a
reciprocatory motion for the operation of the
slow to center the pilot valve at its neutral posi
main control members. A pilot valve ID has an
tion and the servo motor will move to an over
correcting position. In my present invention the
inlet port II to which is connected a source of ‘
?uid under pressure at H for operating the servo
time period in opening the pilot valve to a wide
position after the ?rst initial opening and in the 40 motor, a delivery port l3 extends to the under
side of piston 8 and delivery port I 4 extends to
closing movement have been reduced to a mini
upper end of cylinder 9 above piston 8 through
mum, the rapid opening movement tending to
minimize transportation lag and the rapid clos
conduit IS.
A sliding piston valve US has spaced cylindrical‘
ing movement tending to minimize regulator over
45 portions 11 and I 8 which control the admission
correction.
and exhaust of ?uid under pressure to and from
In the drawings Fig. 1, shows a side elevation,
opposite ends. of the servo motor cylinder 9.
parts such as the diaphragm chamber, pilot valve
and servo motor piston, being shown in section.
The regulator is shown operatively connected to
a damper, valve and rheostat and may be used
for operating one or all of these control devices.
Fig. 2 shows a plan view of the follow-up re
turn motion with a step action operating member
supported thereon.
Fig. 3 shows an elevation of the step action and
When valve I6 is raised,’?uid is admitted past the
lower edge of cylindrical portion l1 to port l3
and to the under side of piston 8, at the same
time the lower side of cylindrical portion 18 is
moved upward permitting the‘ exhaust of ?uid
from the upper end of cylinder 9 through con
duit l5 and port l4 thence to exhaust connec
55 :tion l9. ‘This operationcausespiston 8 to‘ move
2,404,849
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3
upward. When valve I6 is lowered ?uid is ad
mitted past the upper edge of cylindrical portion
l8 thence through port l4 and conduit I5 to the
the operation thus far given that piston 8 of the I
servo motor could be operated in a slow motion
or a relatively rapid motion depending on the
nature of the impulse in pressure change acting
on diaphragm 29 in chamber 39 and likewise
the stopping of the piston 8, or the point at which
a reversal of operation might take place, could be
at anypposition between the limits of operation of V
top of cylinder 9 and at the same time ?uid is
exhausted from the bottom of cylinder 9 through
port I3 and past the upper edge of cylindrical
portion I‘I thence through passage 20 to exhaust
connection l3. This operation causes piston ‘8 to
move downward. Valve'It is pivotally ‘connected
the servo motor. ‘
:_
.
at 2| with a ?oating lever 22. The right hand 10
My invention resides in ‘part in ‘means associ
end of ?oating lever 22 has pivotally mounted
ated with the follow-up compensating means
connecting rod 23 which connects the ?oating “
adapted to effect an abrupt relatively high speed
lever 22 with weighted beam 28 of a pressureire- ' 7 ‘operation of the servo motor between de?nite
sponsive device. Variations in pressure in cham—
steps of operation in either direction and con
ber ‘39 acting on a diaphragm 29 actuate weighted 15 sists of .an additional control supported wholly
beam 28 through knife edge fulcrum positions 29
and 26 to raise or lower ?oating lever 22 and con
by the follow-up which I will now describe.
My invention includes an additional control for I
sequently valve It to thereby operate the servo“
actuating the left hand end of ?oating lever 22
motor a counter weight 21 is adjustable on beam
to thereby effect an abrupt operation of the pilot
28 in counter-acting the pressure setting of the 20 valve It to cause a relatively high speed opera
regulator; A further description of the invention
tion of piston 9 for a de?nite step of operation re
will be clear. if it is understood that an upward
gardless of the nature ‘of the initial impulse'a'ct-V
movement of valve It through an increase in
ing on diaphragm 28. To accomplish this ob
pressure on diaphragm 29 means an upward
ject I provide an operating member 38 having
movement of piston 8 and likewise a downward 25 a long arm a! equipoised at a neutral position by
movement of valve it through a reduction in
resilient means such as springs 42 and 42’ a gear
pressure on diaphragm 29 means a downward
rack 43 is . attached. to wedge 3i and drives a
movement of piston '8.
i
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gear pinion 413 attached to an operating cam 45.
In order to obtain the maximum effectiveness
This operating cam 45‘ has three notched depres
of the step action principle a relatively Wide lap 30 sions equally spaced ‘positions 46 at its periphery;
ping of the ports I 3 and. I 12 by the cylindrical por
tions I‘! and I8 is desirable.
This not only in—
sures a positive step of operation but provides a
de?nite dwell, or non-responsive action; at each
of the step positions which compensate for time
lag by ‘acting as an equilibrator after each step
of operation before moving to a succeeding step
position.
any number can be used depending on the length i
of step required.
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_
These notches at the periphery of cam 45 are
engaged by a projection 41 at the left hand (and
of long arm Li I. This projection such as a stud or
roll assumes an equilibrium or neutral position
by means of the balancing springs§42 and 42’
attached to said arm when stud 47 engages
notches 45.
I will next describe the'operation from the fol
low-up return motion, a wedge 3| is connected at 40
The operation of the cam 4-5 and its associated
its upper end to link 5 secured to piston rod ‘I
members will be best understood by a'reference to
said wedge having reciprocating motion co1‘re
Fig.4 and Fig. 5. Assuming an upward move
spending to that of piston ii, a bell crank 32 is
ment of piston '8, aswould be the case with an
pivoted to a suitable stationary support at 33 (see
increase in pressure acting on diaphragm 29, then
Fig. 3) has a shoe 34 held in contact with wedge
cam ~45 would be operated counter clockwise and‘
35 by means of spring 35 and is adapted to rock
arm 4| would assume aposition as shown in Fig.
bell crank 32 with the upward and downward
4. This operation would raise pivot point 40 and‘
movement of piston 9 and connecting wedge 3|.
operate ?oating lever 22 to thereby open the pilot
There is pivoted at the right hand end of bell
valve ports an amount‘ in excess of its initial
crank 32 (see Fig. 2) at’p‘oints 36 and 3'! a yoked 50 opening. Likewise on a downward motion of pis
member 32 having a short arm 39 movable with
that of bell crank 32, ?oating lever 22 being con
nected to this arm at pivot point 49.
Assuming an increase in pressure in chamber
39 causing an upward movement of valve l6, pis
ton 8 as on a decrease in pressure on diaphragm
29, cam 45 will be operated in a clock-wise direc
tion and arm M will assumea position as shown
in Fig. 5, further opening the ports of valve I6 for
the downward stroke. This additional control for
effecting step‘by step operation of the servo motor
ton 8 and its connecting wedge 3|, shoe 34 in
following the angle of wedge SI will be forced to
cooperates ' with the follow-up compensating
the right causing the right hand end of hell
means in the following manner.
.
crank 32 to be lowered, which in turn lowers the
Assuming the initial opening of the pilot valve left hand end of ?oating lever 22 thus returning 60 I6 is 3%;4” of an inch, which would be suf?cient to
the valvev It to 'a neutral position. On a reduc
give a slow motion to the servo motor piston 8,
tion of pressure in chamber II the reverse oper
ation takes place valve is is lowered ‘below its
neutral position and the right hand end of ?oat
ing lever 22 is raised to again return the valve It
to neutral position, neutral position as above re
ferred to meaning a mid position between two
effective positions to which the initial operation
and the additional ‘opening effected by the‘ oper
ation of cam 95 isl/wfof an inch eiiecting a more
rapid motion of piston 9, at the ‘same time the
return motion of the follow-up effected by wedge
3|, for the step of operation, will be the same ‘as
’ the initial opening plus the amount of lap be-
tween the neutral ‘position and its effective ‘posi
tion, consequently when projection 47 engages
The operation of this class of regulators having 70 notch ‘46 ‘allowing arm_ M to assume its equilibi
a follow-up compensated control is generally re
rium position, the'pilot valve will have been re
of the motor is effected.
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ferred to as ?oating regulation as distinguished
from “step action” regulators disclosed in my
earlier patents.
'
It will be understood from the description of
turned to its neutral position to await a further
variation in pressure on diaphragm 29 for a fur;
ther operation of the servo motor.
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It is possible that'the'change in pressure act
2,404, 849
5
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ing on diaphragm 29 could be su?icient to oper
ate the pilot valve stem It‘ so far above or below
its neutral position that the return motion of
the follow-up wedge 3! would not be su?icient to
bring the valve l6 back to a neutral position in
a single step of operation. However, when the
stopping point is reached it would be at a step
sure ?uid for operating the motor, a ?oating lever
connected with said valve for imparting move
ment to the valve, an actuator coupled to the
?oating lever at a point at one side of the point
where the connection from the valve to the ?oat
ing member is made, a bell crank pivoted at a
position corresponding at a step position under
normal operation. The invention has by way of
member pivotally connected with one arm of said
bell crank at a location displaced from the ful
?xed point with respect to the motor, a yoke
example been illustrated and described as a pres
crum of the bell crank and having an arm which
sure control regulator, it is to be understood, how
ever, that the invention may be applied to other
regulating combinations, as for example by re
placing the diaphragm with a thermostat element
is pivoted to the ?oating lever at the opposite
side of its connection with the valve from the side
at which the connecting point of the ?oating
it may be used as a temperature control.
In ac
cordance with the provisions of the rules of prac
tice of the Patent Of?ce, I have described the
principle of operation of my invention, together
with the apparatus which I now consider to rep
resent a preferred embodiment thereof; but I 1
desire to have it understood that the apparatus
shown is only illustrative and is capable of var
ious modi?cations and that only such limitations
shall be imposed as are indicated in the appended
claims.
I claim:
1. In a regulator having a ?uid pressure oper
ated motor and a valve adapted, to control the
?ow of working ?uid to said motor, a ?oating
lever coupled with said valve, an actuator mov- -
lever with said actuator is located, a wedge mem
ber connected to be moved by the motor and ar
ranged to bear on another arm of said bell crank
to impart movement thereto, and a cam also con
nected to be driven by the motor engaged with a
part of said yoke to impart movement thereto
about the pivotal connection of the yoke with the
bell crank.
4. In a regulator having a ?uid pressure oper
ated motor and a valve adapted to control the
?ow of working fluid to said motor for operating
the motor in either of two directions, a ?oating
lever coupled with said valve, an actuator mov
able in response to changes in the conditions gov
erned by the regulator, operatively connected
with said ?oating lever to transmit motion
thereto, a second lever pivoted on a stationary
able in response to changes in the conditions gov
fulcrum, means operated by the motor and en
gaged with said second lever for imparting move
said ?oating lever to transmit motion thereto, a
ment thereto, a coupling member carried by the
second lever pivoted on a stationary fulcrum,
second lever in pivotal connection therewith at a
means operated by the motor and engaged with 35 distance from the fulcrum thereof and in motion
said second lever for imparting movement there
imparting connection with the ?oating lever, and
to, a coupling member carried by the second lever
a cam driven by the motor acting on said cou
erned by the regulator, operatively connected with
in pivotal connection therewith at a distance
pling member to move said member in one or the
from the fulcrum thereof and in motion-impart
opposite direction relatively to the second lever.
5. In a regulator having a ?uid pressure oper
ing connection with the ?oating lever, and a cam 40
driven by the motor acting on said coupling mem
ated motor and a valve adapted to control the
ber to move said member relatively to the second
?ow of working ?uid to said motor for operating
lever.
said motor in either of two directions, a ?oating
lever coupled with said valve, an actuator mov
‘ 2. The combination with a ?uid pressure actu
able in response to changes in the conditions gov
ated motor, a valve controlling the supply of
erned by the regulator, operatively connected
working ?uid to the motor, and a plurality of
with said ?oating lever to transmit motion there
motion-imparting elements connected for opera
to, a second lever pivoted on a stationary fulcrum,
tion by the motor, of a movable member mounted
means operated by the motor and engaged with
to receive motion from one of said motion-im
said second lever for imparting movement there
parting elements, a coupling member mounted on
to. A coupling member carried by the second
the before named member with capability of in
dependent movement relatively thereto and oper
lever in pivoted connection therewith at a dis
atively associated with another of said motion
tance from the fulcrum thereof and in motion
imparting elements to be actuated thereby, an ac
imparting connection with the ?oating lever, said
tuator movable in response to changes in condi 55 coupling member beingequipoised relatively to
tions to be governed by said motor, and a ?oating
the second lever by resilient means, and a cam
driven by the motor acting on said coupling mem
lever in connection with said actuator, coupling
member and valve.
ber to move said member in one or the opposite
3. In a regulator, a ?uid pressure operated mo
direction relatively to the second lever.
tor, a valve adapted to control the ?ow of pres
- JAMES L. KHWBALL.
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