close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2113943

код для вставки
April 12, 1938.
J. |_. KIMBALL
2,113,943
CONTROL SYSTEM
Filed Feb. 18, 1936
III
MVVENTORL I
2,113,943
Patented Apr. 12, ‘19-38
1 UNITED STATES."
PATENT- OFFICE
2.113.943
coN'mor. SYSTEM
James Lewis Kimball, Danvera, Mass., assignor
to Ruggles-Klingemann Mtg. 00., Salem, Mass: .
Application Februari 1a, 1936, Serial No. 04,539
5 Claims. (01. 50-10) '
This invention relates to regulators for general 4 controls a source of pressure for operating valve
i. The pilot'valve has admission valve 5 and ex—
use in fluid systems such as the control of pres
haust valve '8. A rocker arm ‘I is actuated by
sure, temperature; or other like physical condi
lever 8 adapted to actuate either valve 5 or 5.
tions to maintain the same within de?nite prede
5
termined limits.
-
‘
'
The principal object of my invention is to pro
vide a periodic actuation of the regulating means,
the degree of said actuation varying with varia
tions from normal in the condition of the sys
10 vtem with a variable time delay between each pc
Springs 8 and I0 normally hold these valvesina 5
closed‘ position. The raising of lever 8 opens
valve 5 admitting pressure to diaphragm chamber
II and closing valve- l. Likewise a downward
movement‘ of lever "8 will?rst close valve '5 and
then- open valve 6 exhausting‘ pressure "from 10'
chamber H and allowing spring 8 to open valve
may be compensated for and a condition of - i. vii. pressure sensitive device i2 has ?exible
over-correction and consequent hunting action diaphragm‘ I3 and pressure chamber‘ H which
chamber is connected to the pressure system
To accomplish the objects of my invention I which it is required to‘ control. The ‘pressure on 15
provide a vcontinuous operatingwr driven'cam diaphragm i3 is counteracted by the‘ spring i5.
cooperating with a device which is sensitive to This ?exible diaphragm l3 has a pressure plate
"and rod I ‘l which connects-the diaphragm II
variations in the condition of the system; the ar
rangement being such that the degree of opera-v with a link l8 so as to operate the'same. Link i8
tion is a variable conforming to the._.degree of ‘de “supports two horizontal ?oating levers l8 and 28
{which are pivoted on link lit at points 2i and
parture from a mean average value‘ of the con
22. A continuous operating motor 23 of the clock .
dition of the system and adapted to e?ect varia
ble periods of rest to allow the time lag of the type having gear reduction to _1 R. P. M. is ‘usual
system tovbe taken up before proceeding to a ly. found suitable for the purposes of this inven
tion, altho with excessive time ‘lag. a greater
5 Vfurther degree of operation.v
In regulators of the class disclosed. which do speed reduction is often required. This motor 28
not embody the novel features of my invention operates cam 24~to alternately rock ?oating le
riod of operation whereby time-lag of the'system
avoided.
‘
-
_
and where there is a time lag in the response of ‘ vers l9 and 20 about pivot points 2| and 22. Abut
the system to actuations by the control mechar
' 30 nism, the condition of the system will ?uctuate to
a greater or less degree depending on the extent
of the time lag because the control mechanism
1 .will over correct and operate with a continuous
gas
hunting action.
.
ments 25 and 28 are connected to levers l9. and
20 and are held in contact with cam 24 by spring
.In operation. motor‘leads 2'8 and 28 are con"
nected to a suitable source of electric energy and
cam 24 starts turning.
Now assuming that the '
pressure of the system is at a mean average value.=
In the operation of regulators of this class, ' then the tappet screws 30' and 8| will be ad 3.5
which include the novel features of my invention,
the time delay between each period of actuation
will be such as ,to allow the time lag of the sys
tem‘ to be taken up before proceeding to a further
40 actuation and therefore the time lag of the sys
tem is compensated tor and an unstable opera- v
tion of the control mechanism is avoided.
My invention will be best understood by refer
ence to the accompanying drawing in which Fig.
45 1 is a diagrammatic illustration of the essential
elements which go to make up a complete con
'trol system of the relay type.
Fig. 2 shows a
' ‘thermostatic element which may be substituted
for the pressure sensitive element‘ when the
5g mechanism is to be employed for temperature
control instead of pressure.
Referring to Fig. 1 a pressure control valve I
having ?exible diaphragm 2 and diaphragm pres
sure counteracting spring 3 is suitable for carry
55 ing out the objects of my invention. A pilot valve
'iusted to barely clear arm 8 when the projecting
part 24—A oi’ the cam 24 passes over abutment ,
25 or
28.‘
-
-
-
__
I
Now assuming there was an increase in the 40
pressure in the system whichv ‘would cause‘ dia
phragm 18 to be forced upward against the ten
sion at spring it which would raise pivot points,
2i and 22. then as cam projection 24-A passed '
over abutment 25 tappet screw 88 would con-.
tact with lever 8 momentarily opening valve 8
and admitting pressure to chamber l I and slight
ly closing valve l.
-
0n the other hand, should‘ there be a‘ ‘slight
drop in pressure then as cam‘ passed over abut 50
ment 28 lever 20 would in like manner be rocked
on pivot point 2| and tappet screw it would
contact with the upper side of lever 8' to open
exhaust valve 6 and discharge a slight amount
of pressure ,from chamber ll which ‘would allow
2
,
2,113,943
spring 3 to slightly open‘valve l and supply the
de?ciency in pressure. It will be understood that
if there is a larger variation from normal in the
system, then either valve 5 or 6, depending on
whether the variation is above or below normal,
will be opened wider and for a longer period 01.’
time thus correcting the larger variations from
normal, and furthermore if there is an extreme
variation from normal then either abutment 25
10 or 26 as the case may be will be ,forced away
and electric operated means including a cam in
engagement with and adapted to rock said ?oat
ing member to cause a periodic actuation of
either one or the other of said valves depending
on the value of the pressure on the pressure
sensitive device and having a uniform non
responsive period between each period of opera
tion.
3. In a pressure system, a valve for controlling
the pressure in the system, ?uidpressure means 10
from contact with cam 24 against the tension
for actuating the valve, a pilot valve for control
of' spring 21 and one of‘ the valves 5 or 6 will ling the ?uid pressure means, a ?oating member
(n be held open continuously until normal pressure for operating the pilot valve, a pressure sensi
'is restored‘.
'
tive device for actuating the ?oating member
15 > While I have described my invention in relap ‘and electric operated means includinga cam in 15
tion to the control of steam pressure, it should engagement with said ?oating member co-acting
be'understood that it is of equal advantage in with the pressure sensitive device adapted to
the control of temperature and the only change rock said ?oating member to cause aperiodic
required would be to substitute the thermostatic actuating of said pilot valve when the pressure
20 element of Fig. 2 in place of diaphragm II: The acting on the pressure sensitive device varies 20
application to liquid level control through ?oat from its normal value.
operation or any control means of compensat
4. In a control system for the regulation of a
ing‘ for time lag and thereby preventing over condition to maintain the same within prede
correction is within the scope oi my invention.v termined limits, comprising means for control
25 I, therefore, wish to have it understood that I ling said condition, ?uid pressure ‘motive means 25
do not desire to be restricted to the exact details for actuating the controlling means, a control
of construction -and arrangement of the parts valve for controlling a source of pressure to oper
shown and described, but that only such limita
ate the ?uid pressure motive means, a floating
tions shall'be imposed as are indicated vby the member for operating the control valve, a device
30 appended claims‘.
sensitive to the condition to be controlled, piv 30
I claim:—
oted to and adapted to position the ?oating mem
1. In a control system for the regulation of a . ber, and a continuous operating cam adapted to
condition to maintain the same within a prede
termined value, comprising means for controlling
35 said condition, ?uid pressure means for'actuat
rock said-?oating member on said pivot to cause
actuation of said control valve when said condi
tion departs from said predetermined limits.
' ing the controlling means, a valve for controlling
the ?uid pressure means, an element sensitive to
5. In a controhsystemdfonhed?g'u’lation of a
condition to maintain the same within predeter
variation from normal in said condition, a ?oat
ing member adapted to be operated by the vari
mined limits, comprising means for controlling
35
‘said condition, ?uid pressure motive means for
40 ation in said sensitive element, and electric Opel?‘
actuating the controlling means, a control valve 40
ated means including a cam in engagement with for controlling a source of pressure to operate
and adapted to rock said ?oating member to the ?uid pressure motive means, a ?oating mem
cause a periodic actuation of said valve when said ber for operating the control valve, a device sen
condition acting on the sensitive element varies‘ sitive to variations in the condition to be con
45 from its normal value and a uniform period of trolled, pivoted to and adapted to position the 45
rest between each period of operation.
?oating member and a continuous operating cam
2. In acontrol valve comprising a valve casing adapted to rock said ?oating member about said
having admission and exhaust valves, said valves pivot and thereby actuate said valve with cycling
having a neutral position in which both valves ‘periods of operation varying in time and extent
50 are closed, means for alternately opening either in accordance with variations in the positioning
one-or the other of said valves, .a ?oating mem
ofsaid member.
ber for operating said means, a pressure sensi
JAMES LEWIS KIMBALL.
tive. device for actuating the? ?oating member,
Документ
Категория
Без категории
Просмотров
0
Размер файла
321 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа