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Патент USA US2137589

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Nov. 22, 1938.
W_ RAYMOND
2,l37,589
FLYWHEEL GOVERNOR FOR STEAM DRIVEN COMPRESSORS
Filed Nov. 4, 1935
2 Sheets-Sheet l
/6
IN VEN TOR.
Nov. 22, 1938.
w, RAYMQND
2,137,589
FLYWHEEL GOVERNOR FOR STEAM DRIVEN COMPRESSORS
Filed Nov. 4, 1935
~23
2 Sheets-Sheet 2
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IN VEN TOR.
WBI'dR: mand
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Patented Nov. 22, 1938
Parent lorries
UNITED STATES
2,137,589
FLYWHEEL GOVERNOR FOR STEAM DRIVEN
.
.
COMPRESSORS
‘
Ward Raymond, .Easton, Pa., assignor to ‘Penn
sylvania Pump and Compressor Company, a
corporation of Pennsylvania
Application November 4, 1935, Serial No. 48,161
(01. 230—4)
3 Claims.
compressor for air or gas.
An object‘of the invention is to provide a gov
ernor of the ?y-wiheel type having a spring
loaded centrifugal member connected ‘to’ and
varying the position of a valve operating member
to regulate the speed of the engine, there being a
supplementary means acting upon the centrifugal
“10 member to reduce the speed of the engine when
the compressor driven by the engine is unloaded.
Another object of the invention is to provide
a pressure actuated plunger acting upon the cen
trifugal member of the governor, pressure being
running substantially unloaded.
With the above and other objects in view, my .35
invention includes the features of construction
and operation .set forth in the following speci
?cation and illustrated in‘ the accompanying
drawings.
In'the accompanying drawings annexed here- .10
to and forming apart of this speci?cation, I have
shown my invention applied to a steam driven
air compressor of the straight line type, but it
will be understood that the invention can be
otherwise embodied and that the drawings are 35
' applied to move this plunger and force the cen
trifugal member toward a speed reducing posi
tion when the ?uid compressed by the compressor
has reached a predetermined pressure.
x.
fluid pressure means, acting upon the centrifugal
element .of a fly-wheel governor to materially re
duce the speed of the engine when the engine is
This invention relates to a speed and load gov
ernor for a steam engine directly connected to a
.
And ?nally it is an important object of the in
20 vention to provide _a speed responsive element
on the governor and a load responsive element
acting upon the speed responsive element, these
members acting to position the valve controlling
member of a steam engine governor such as an
eccentric, so that the speed of the engine may be
maintained substantially constant during normal
loaded operation of the compressor and may be
maintained at a materially reduced speed ‘when
the compressor is running unloaded.
In the operation of steam driven compressors,
.30
it isdesirable to employ a standard form of gov
ernor to'control the speed of the engine as by‘
varying the position of the valve gear of the en
gine by means of which the admission of steam
to the engine cylinder is cut off at different
points in the stroke of the "piston. An excessive
speed is ‘prevented by this type of ‘governor and
the speed will be held substantially constant at
all times. Without some additional means being
40 provided, however, this same maximum and con
stant speed will be maintained during ‘those pe
riods when the compressor may be running ven
tirely unloaded. During such periods the speed
of the engine should advantageously be ‘reduced
materially and when the compressor is again op
erating normally under load the speed should
again :be increased as called for up .to its stand
ard or predetermined speed.
The above objects are accomplished by de—
creasing .the force exerted upon the centrifugal
element of the governor. for the engine by the
speed regulating spring when the compressor is
unloaded and the engine is rotating without ap
preciable load. A particular object of .theinven
tion therefore is to provide means, preferably
not to be construed as de?ning or limiting the
scope of the invention, the claims appended to
this speci?cation being relied upon for that pur—
pose.
.
‘In the drawings:
'
‘
:
v
2.0
Fig. l is ,a longitudinal view of a complete
steam driven compressor shown generally in out
line.
‘
'
'
Fig. 2 is a side elevation ‘partly in section of a
fly-wheel governor having the present invention 25
applied thereto. '
Fig. 3 is a cross sectional view of the parts
shown ‘in Fig. '2 taken through the axis of ‘0s
cillation :of the centrifugal member.
Fig. 4715 a sectional “view of a modi?ed form 39
of one vof the details of the present invention.
'
In the above mentioned drawings, I have shown
but :one [embodiment .of the invention and a slight
variation thereof, which are now ‘deemed prefer
able, but it is to be understood that changes 35
and ‘modi?cations may be made within the scope
of the appended claims without departing from
the spirit of the invention.
Brie?y, and in its preferred aspect, my inven
tion may include the following principal parts: 40
First, a fly-Wheel governor with which a steam
engine drivingly connected to ,a compressor may
be provided; second, an oscillatory centrifugal
member pivotally mounted thereon; third,v an
adjustable spring disposed between a portion of 45
the fly~wheel and the centrifugal element for
controlling the oscillated position of the centrif
ugal element at different speeds of the engine;
fourth, valve gear for the engine operated by
means mounted on the ?y-wheel, the position of 50
which is ‘controlled (by the oscillated positions of
the centrifugal element; ?fth, ‘pressure ‘operated
means applicable to act upon said centrifugal
element in opposition to the speed {controlling
spring; and sixth, connections to apply “?uid :un- 55
2
2,187,589
der pressure to said pressure operated means
from the compressor receiver.
Referring more in detail to the ?gures of the
‘ drawings, I show in Fig. 1 a complete general
View of a steam driven compressor to which the
invention has been applied. The steam cylinder
is shown at H) and the compressor cylinder at l l.
Pistons I2 and I3 respectively within these cylin
ders are on the same piston rod l4, one end of
which is connected to a cross head IS. A con
necting rod l6 drivingly connects the main crank
shaft I ‘l- of the engine with the cross head l5.
On the main crank shaft I1 is one or more ?y
wheels |8, one of which mounts the governor con
15 trolling the admission of steam to the steam cyl
inder Hi. It will be understood that the governor
operates by means of an eccentric, the eccentrici
ty of which is varied and which in turn varies the
movements of the steam admitting valve (not
20 shown).
Referring now to the fly-wheel governor shown
in Figs. 2 and 3, I provide an elongated arm,
which is pivotally mounted on the ?y-wheel I8
and forms a centrifugal element 2|. This ele
25 ment 2| is of the usual form of centrifugal ele
ment as used on speed responsive regulators or
governors generally of the fly-wheel type. The
pivot 22 by means of ‘which the element 2| is sup
ported upon the ?y-wheel may extend through
30 the hub of the ?y-wheel l8, the element 2| being
mounted on the outer side. As shown in Fig, 3,
the element 2| is keyed to the pivot 22, so that
oscillatory movements of the element 2| will os
cillate the pivot or shaft 22.
Closely adjacent
the inner face of the ?y-wheel is an eccentric
plate 23, which may be integral with the pivot
22, and to which may be adjustably secured an
eccentric 24. The peripheral surface of eccentric
24 is engaged by the eccentric strap 25 directly
40 connected to the valve gear (not shown) of the
engine by eccentric rod 26. The above described
a plunger 42 is forced in a direction to compress
a spring 43 and force a plunger 44 outwardly.
This second plunger 44 is attached by means of
a suitable link 45 to the extended portion of the
centrifugal element 2|. In the form of cylinder
32 shown in Fig. 2, there is an intermediate in
wardly extending shoulder 46 which prevents
movement of the plunger 42 beyond a central
position. This shoulder 46 limits the amount to
which the spring 43 may be compressed and 10
therefore limits the force exerted against the
centrifugal element 2| in a direction to oppose
spring 29. I
In Fig. 4, a modi?ed form of cylinder 50 is
shown corresponding to cylinder 32, in which the 15
force of compression exerted against the spring
5| corresponding to spring 43 is unlimited by
any shoulder and the force acting upon thev cen
trifugal element 2| may be Widely variable by
movement of piston 42. To prevent the element 20
2| from oscillating rapidly due to slight change
in pressure within the cylinder 32 or 50, a dash
pct 52 preferably may be provided, attached by
its piston rod 53 to the outer end of the extended
portion of‘the element 2|. Rod 53 is retarded in 25
its movement in and out of the dash pct 52 by
any usual means.
In the connection or pipe 39 between the dis
charge pipe 38 of the compressor and connection
36 to cylinder 32 or 50 there may be interposed 30
a pilot valve 56. This pilot valve 56 may also
control admission of ?uid at receiver pressure
to unloading devices with which the compressor
may be supplied (not shown). Until the prede
termined’ discharge or receiver pressure is 35
reached therefore, no pressure will exist in the
connections 39 and 36. As soon, however, as a.
particular discharge pressure is reached pilot
valve56 opens and admits the ?uid under pres- ,
sure to the cylinder 32 or 5.0 and tends to force 40
struction employed on directly coupled steam
the centrifugal member 2| toward a position
which reduces the eccentricity of the eccentric
24 and thus materially reduces the speed of the
driven compressors and therefore will not re
engine.
members are all of well known and usual con
45 qire further description.
'
The element 2| is limited in its oscillatory
movements by stops 28 provided on the inner
portion of the fly-wheel rim and is forced in one
direction by an adjustable spring 29. It will be
50 understood that by adjustment of the spring 29
movement outward of the element will be resist
ed by greater or less force so that the engine
may be driven at a predetermined speed gov
erned by the tension of spring 29.
I
In addition to the spring 29 acting upon the
element 2| by means of which the speed of the
engine may be controlled, there is a supplemental
means acting upon the element 2| in opposition
to the direction of action of this spring 29. This
60 supplemental means includes a small cylinder 32
mounted directly upon the fly-wheel l8. To one
end of this cylinder 32 ?uid pressure may be
55
admitted as by means of a tube 33 the opposite
end of which enters a rotating part 34. This
65 member or ?tting 34 is mounted in alignment
with the axis of rotation of the fly-wheel l8.
This ?tting 34 is surrounded by a ?xed member
35 to which fluid may be admitted as from a
vertical pipe 36 extending to and supported with
in a stand 31 from the ?oor. This pipe 36 is
supplied with ?uid under pressure from the re
ceiver or discharge pipe 38 of the compressor.
For that purpose a tube or pipe 39 extends from
the pipe 36 and stand 31 directly to discharge 38.
With ?uid admitted to the small cylinder 32
75
With cylinder 32 the force exerted upon the
member 2| by the plunger 44 is limited and with
pilot valve 56 in the connection 39 the pressure
of plunger 44 will be exerted upon the element
2| only when the pressure for which pilot valve
56 is adjusted is exceeded. With cylinder 32 em 50
ployed but without a pilot valve in connection
39 variations of pressure of plunger 44 will be
exerted against the element 2| up to the maxi
mum permitted by the movement of the piston
42 to the intermediate position limited by pro 55
jecting ?ange 46. With cylinder 59 employed to
force plunger 44 toward element 2| and without
a pilot valve 56 in the connections 39, the ele
ment 2| is subjected at all times to a variable
force dependent upon the pressure of the com
pressed ?uid, this force acting to move the ec
centric 24 to a speed reducing position and in
opposition to the force exerted upon the element
2| by the spring 29.
In either case when the compressor is unload
65
ed or operating without substantialload, the
centrifugal element 2| of the governor for the
engine is in effect adjusted for a different and
lower speed than when the engine is operating
with the compressor loaded. This adjustment is 70
accomplished by the variation in load and acts
directly upon the centrifugal element of the ?y
wheel governor.
I claim:—
1. In combination, a compressor, a steam en
75
3
2,137,589
glne for driving said compressor, a governor for
said engine comprising a centriiugally operated
element pivoted on said ?ywheel and connected
to control the speed of said engine, spring means
resisting the action of centrifugal force on said
element, a cylinder on said ?ywheel adjacent said
element and having a fluid operated plunger
therein, means connecting said plunger to said
element, and means to admit ?uid discharged by
10 said compressor to said cylinder to force said
plunger in a direction to reducethe force exerted
by said spring upon said element, whereby the
speed of the engine may be reduced when the
compressor is operating in its unloaded condi
tion.
2. In combination, a compressor, a steam en
gine for driving said compressor, a governor for
said engine comprising a centrifugally operated
element pivoted on said ?ywheel and connected
to control the speed of said engine, spring means
resisting the action of centrifugal force on said
element, a cylinder on said ?ywheel adjacent
said element and having a ?uid operated plunger
therein, means to limit the movement of said
25 plunger within said cylinder, means connecting
said plunger to said element, and means to ad
mit fluid discharged by said compressor to said
cylinder to force said plunger to its limited po
sition toward said element to reduce the force
exerted by said spring upon said element, where
by the speed of the engine may be reduced a pre
determined amount when the compressor is op~
erating in its unloaded condition.
3. In combination, a compressor, a steam en
gine for driving said compressor, a governor for
said engine comprising a centrifugally operated 10
element pivoted on said ?ywheel and connected
to control the speed of said engine, spring means
resisting the action of centrifugal force on said
element, a cylinder on saidnflywheel adjacent
said element and having a ?uid operated plunger 15
therein, means to limit movement of said plunger
Within said cylinder, means connecting said
plunger to said element, means to admit ?uid
pressure to said cylinder to force said plunger
to its limited position toward said element when 20
the compressor discharge reaches a predeter
mined pressure to reduce the force exerted by
said spring upon said element, whereby the speed
of the engine may be reduced when the com
pressor is operating in its unloaded condition.
WARD RAYMOND.
25
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