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Патент USA US2134693

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Nov. 1, ‘1938.
.1. M. BAR-THOLOM-EW
2,134,693
PUMPING MECHANISM
‘Filed July 16, 1936
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Patented Nov. 1-, 1938
2,134,693v
‘Q UNITED ‘STATES PATENT OFFICE,
PUMPING MECHANISM
Jess M. Bartholomew, Michigan City, Ind., as
signor to Sullivan Machinery Company, a cor
poration of Massachusetts
‘Application July 16, 1936, Serial No. 90,946
15 Claims. (01. 230-24)
My invention relates to an improved automatic
concurrently movable contact elements I _l , I v2, and
Ill respectively controlling current ?ow from the
lines L1‘, ii.2 and L3, is arranged to control the
It is desirable in the operation of motor driven _ supply to the motor leads M1, M2 and M3, and
5 compressors, particularly where a fairly constant. overload coils O1 and 0a are arranged in the 5
and high demand for air exists, to operate the motor leads M1 and M3.
_
compressor on the continuous-drive, load-and
A plunger l 4 is arranged in position to be raised
. unload system of output control. ‘It is also de
by a solenoid l5 upon energization of the latter to
sirable to control ‘the compressor during starting close the multi-pole switch 1 and effect motor
system for controlling the starting and operation
_ of a motor driven compressor.
'
10 in such manner that the compressor shall start
unloaded. It-is further desirable to use the
starting.
The overload coils O1 and 03 have re- 10
spectively associated with them plungers 0,11 and
simplest possible controlling equipment to accom
0"‘ arranged so that either or both may actuate
plish the functions mentioned. These same prin
an appropriate overload controlled switch It.
ciples of course apply to pumps handling other
The compressor cylinders I1 and 18 are each.
15 ?uids than air where the conditions‘ are generally , provided with individual inlet - and discharge 15
the same, and it is perhaps even more important valves, and Fig. 2 shows the inlet and discharge
to provide for starting of a hydraulic pump un
valve mechanism and associated unloading mech
loaded than is the case vwith compressors tor anism for one oi‘ the compressor cylinders.‘ A
gaseous ?uids.
. P
passage 20 opens into the outer end of one of
It is an object of my invention to provide an the compressor cylinders. . An inlet valve mech- 80
‘improved compressor controllmgapparatus. .It anism 2| controls the admission of air to the
is another object of my invention to provide an cylinder through the port 20. A discharge valve
improved compressor controlling apparatus ‘op
erating to control the volume of ?uid‘ pumped by
25 loading and unloading, while drive is maintained.
It is 'a. further object of my invention to provide
an improved. pumping system having improved
mechanism 22 controls the discharge of air
through ‘the port 20 and to a space 23 communi
cating with one of the branch discharge lines ‘5. 25
A plunger 24 movable in a cylinder 25, and nor-‘i
mally maintained in its outer position by a spring means for effecting unloading during starting, as - 2'6, actuates a fork-like member 21 whose prongs
well as unloaded operation when a predetermined
28 pass through the port openings 29 in the inlet
30 excess of ?uid is pumped.
Other objects and ad
vantages of the invention will hereinaiter‘more
fully appear.
'
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'
valve mechanism into engagement with the inlet 80
valve proper 30, and'open the latter and hold the
_- latter unseated, that is, in unloading position, '
‘In the accompanying drawing I have shown for ' when air is admitted to the outer end oi’ the cyl
purposes of illustration one embodiment which inder 25. Supply of air to the cylinder 25 is
35 my invention may assume in practice.
controlled by an electrically operated pilot mech- as
In this drawing,
anism 32,, which receives a supply of operating
,Fig. l is a diagrammatic view of a compressor ' pressure through a line 33 leading from the re
out?t‘ having associated therewith an illustrative ceiver 5 and controls the delivery of that oper
embodiment of my improved ‘controlling mech- ’ ating pressure through a line 14 to the cylinders
40
anism.
' '
Fig. 2 is a fragmentary view showing‘ a section
45
25. This pilot mechanism also controls the vent- {0
ing of pressure from theline 34 and cylinders 25
through an electrically controlled pilot mech
anism and through the valve mechanismand
to a point of escape, as at 55.
associated unloading device for a compressor cyl
having ‘a vent chamber 38, a chamber 39 com-1
inder.
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The pilot mechanism comprises a casing 31
muni’cating with the cylinder 25, anda supply 45
Referring ?rst to Fig. 1, it will
noted. that a ‘ chamber 40. ‘Chambers 38 and 38 are connectible,
motor I drives a compressor 2, herein or the ver-‘
through a ‘valve-seatisurrounded port 4| con-‘
tical two-cylinder type. ‘ ‘The compressor dis
trolled by‘a valve .42, and chambers 39 and 4|! ~
charges ?uid through the branch lines 3, 3 to a are connectible through a valve-seat-surrounded
50 discharge line 4. which delivers to a receiver 5, ' port it controllable by a valve 44. Valves 42 5c
from which the pumped ‘fluid may be led away to and M are so related that but one can be seated
a point of use through a connection 6. Current at a time. Springs 45 and 45 normally tend to
for operating the motor i is supplied from lines close each ‘of the valves whenever its closure is
L‘, W and L4. and that motor i ‘is herein of the '
‘5 three-phase type. A multi-pole switch ‘I ‘having
possible. By the provision of arelativel'y heavy
plunger 48 operatively connected‘ with the valves‘ 55
2,134,093
42 and 44, the valve 44 may be maintained open > element 88 of the STOP switch mechanism. The
and the valve 42- closed in the'norm’al position
of the parts, and a suitable relatively powerful
spring 48 may provide avbias oi the plunger 48
in the direction mentioned, thereby reducing the
other stationary contact of the STOP switch
mechanism, designated 8|, is connected by a con
ductor 82 to the pivot end of the interlock switch
8i. From theconductor 18 there branches a con
closed, as shown'inFig. 2, the compressor is' un
ductor 83 which leads to one end of the main
operating coil l5 for the starting switch, and
the other end of said operating magnet coil is
-on the other hand, plunger 48 is raised, valve 44
switch element l6 contacts is connected by a
weight of the plunger necessary.
when the valve'44is open- and the-valve 42
loaded by virtue of the'pass‘age of receiver pres -’ ‘connected by a conductor 84 to a stationary con 10
tact 85 with which switch element l8 'coacts.
10 sure through pipe-88, chamber 48; passage 43, The other‘ stationary contact 86 with which
chamber 8_8_and pipe 84 into cylinder 25. When,
closes port 48 and valve 42 opens port 4|, and
accordingly no more air is supplied to the 'cyl-'
inder 28,'but instead the latter is vented through
conductor 81 to- line L“. A spring 88 normally
maintains the STOP switch element 88 in con
that upon the supply of current to the magnet
tact with stationary contacts 19, 8|. A spring 15
89 normally maintains the switch element 69 in
contact with the contacts 81, 88. A manually
operablev plunger 98 may be moved downward
through means including the dashpot mecha
nism 68 against the pressure of the spring 89 20
winding 58, the same will be energized and effec
tive to lift the plunger 48 -and',cause a reversal
of the position of the valves shown in Fig. 2.
with substantially no retardation, and cause 69
to connect contact elements 16, 11. The dash
pot device 68 provides a slow, retarded, upward
- It will be noted that the pilotmechanism 32
will effect unloading'when the. solenoid or mag
net 88 is de-energized, .and loading when it is
energized, and so that energization and de-en
stantial time delay after pressure is removed from 25
the plunger 98 before contact will be broken
between the element 69 and the contacts 18 and
connection 84, chamber 89, passage 4|, chamber
88 and port 88 to the atmosphere. To raise the
plunger 48 when'desired, a magnetwinding 58
is arranged in proper relation to the plunger so
ergization of the magnet '58 may becaused to
take place in proper dependence upon the receiver
pressure, means is provided including a pressure
responsive switch 82 having herein a pressure
responsive element 58 subjected at one side 'to
receiver pressure through -a connection 84 and
‘having its other side adapted to transmit motion
to a switch element 88 through a suitable mech
anism, herein a bell crank mechanism 56.
Before further describing the circuits of the
illustrative embodiment of the inventionkI may
state that I provide a starting switch mechanism,
generally designated START, and a stopping
switch mechanism, generally designated STOP,
and that with the starting switch mechanism
movement of the switch element 69 with a sub
11. The by-pass 9i permits a_ sharp upward
movement of the switch element ‘68 just as it
approaches the point of leaving contact with the 80
stationary switch elements 18, 11, so that arcing
vis minimized.
I
Now, the mode of operation of this device will
be readily understood, but as a preliminary, it
should be said that the time delay created by
the dashpot device 88 will be made such that
the motor I will have had abundant time to bring
the compressor 2 up to full operating speed be
fore, even following an immediate release of
pressure from the. plunger 98, the switch element
89 will be able to leave contact with the sta
tionary switch elements 16 and 11.
To start the compressor, the operator will de
there is herein associated a time delay device 88 ,
whose purpose and structure will later be de- press the plunger 98 and move the contact ele*
scribed. It may be noted also that at 8| there ment 69 into contact with the elements 18 and 45
is provided an auxiliary switch element of the 11. This will establish a circuit from line L2
so-called interlock type whose purpose will short
ly be apparent, this switch element being moved
to closed positioniconcurrently with the closure ‘
oi the starting switch 1.
- Now it will be noted that a conductor 82 leads
from-the motor lead M? to one end of the magnet
winding 88, and that the other end 01 this mag
net- w'indingis connected by a conductor 88 to
one of the stationary contact elements 64 asso;
ciated with the receiver-pressure-operated
switch element 88. ,The other stationary contact
88, with which the switch element 55 coacts, is
connected by a conductor 88 to a contact 81
forming one of an upper pair (the other num
bercd 88)‘ of contacts of the START switch ap
paratus. A movable contact member 88 in its
through conductor 81, switch 86, I8, 85,conductor
84, magnet winding l5, conductor 83, conductor
18, switch 11, 89, 18, and conductor 15, conductor
12 and conductor 1| to line L1.
This will ener
gize the magnet winding l5, and'the plunger l4
will close the switch 1 and move the interlock
switch element 8| into contact with ‘the sta
tionary contact element 14. Closure of the
switch element 6| will result in a circuit from
line B through conductor 81, switch 88, I8, 85,
conductor 84, magnet" l5, conductor 83, the stop
switch 19, 88, 8!, conductor 82, switch element
8i, stationary switch contact 14, and conductors
18, 12, 1|‘ to line L1, this being in parallel to the
circuit originally established; and accordingly,
even through the spring 89, after a few seconds
upper position is adapted to connect the contacts » of initial supply of motor starting current, moves
81, 88. Contact 88 is connected by a conductor , the contact 89 to break the circuit between con
18 and a conductor H to line L1, and by a-con-> tacts 16, 11,‘ there will be maintained an ener
ductor 12 is connected both to a conductor 18 gizationbi the solenoid l8 and a maintenance
leading to a stationary contact 14’ with which of the switch 1 in closed position. It will be
- the interlock switch element 8i coacts in estab-,' noted that this holding circuit includes the STOP
iishing a circuit later more fully described, and switch mechanism, and that by depressing the
member 88 out of contact with the contacts 18, 10
also by a conductor 18 to a lower stationary con
tact 18 forming one of a pair (the other element 8t, the solenoid l5 can be readily de-energized
is numbered 11) of lower contacts of the START and the‘ motor caused to stop by the opening of
the starting switch 1'.v Itwill be noted, more- .
switch mechanism. Contact element 11 is con
nected by a conductor 18 to an upper contact 19 over, that upon an overload of the motor, the 18
78 engageable in its closed position by the switch excessive ?ow 01' current through either coil 01
3
9,184,698
, or 01, or both. will be effective to cause opening ,a predetermined position to make said unloading
of the switch I‘, and this also will break .the > means inoperative, a driving ' motor for said
circuit through the main motor switch operating " pump, and means for starting said motor con
coil l5, and accordingly result in a stopping of
the motor. As soon as the switch 1 drops open,
nected with said member and moving'the latter
onto! said predetermined position whenaactu
‘ interlock switch element 8| also moves to open
ated to start said motor, and means for maintain‘
position, and so manual closure of the starting
switch mechanism, including the downward
movement of the plunger 98 and the switch eie-‘
10 ment 88, the latter into contact with the con-_
tacts T6 and TI, is necessary to restart the motor.
It will be observed thatlthe depressing o! the
element 69 out of engagement with the contacts
61 and 68 prevents the establishment of a cir-r
cult, which would otherwise have been made on
closure of the switch element ‘ii, ‘if the pressure
was low enough tocause switch 58 to close, from
line L5‘ through‘switch element 12, motor lead
ing said motor in operation when said member
is returned to said predetermined position.
3. In combination, a pump having unloading
means, an electric control for the latter including 10
a pressure responsive switch, a solenoid, and a
further switch, both said pressure responsive
switch and said further switch having to be
closed to effect loading, a pump driving motor
having a starting'switch, and controlling means 15
'for the latter necessitating opening of said sec
ond mentioned switch during starting of the
‘pump'driving motor,
4. In combination, a‘pump having‘ unloading
M", conductor 62, magnet winding 50, conductor
20 88, contact 64, switch element 55. contact 65,‘ means, an electric control for the latter including
a pressure responsive switch, a solenoid, and a
conductor 66, contact 81, switch element 69, con
Accordingly, energization of the winding 58 is
further switch, both said pressure responsive
switch and said‘ further switch having to be
impossible until switch element 68 moves back
a into contact with the contacts 61, 68, and there
having an electrically actuated starting switch,
’ tact 68, conductor 18, conductor ‘H, and line L1.
fore, because of the time delay device, loading
will be impossible until the motor has come up
to speed, the time lapse occasioned by the dash
pot mechanism 68 giving time enough for this‘ to
result. Obviously, the 'dashpot 80 could be omit
ted if it were desired to hold the element 69 man
ually out of contact with the contacts 81,» 68
long enough to permit the motor to come up to
closed to effect loading, apump driving motor
an operating magnet for the latter having ‘a con
trol circuit established by said further switch ,
when the‘latter is moved to open the circuit of
said unload‘ng means control,'and means for
maintaining said magnet energized independent 80
iy of ‘said further switch, whereby reclosing of
said further switch after motor starting is pos
sible.
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speed before establishment of the circuit by the
5. In combination, a pump having unloading
switch 55 is‘openpas will be the case if the re
ceiver pressure is greater than the predetermined
minimum for which the switch. mechanism 82
is set, the compressor will not load, even on the
ing a pressure responsive switch, a solenoid, and '
switch parts 61, 68 and 89.. Of course, if the‘ means, an electric control for the latter includ
upward movement to the position shown in Fig.
l of the contact element 69. '
a further switch, both said pressure responsive
switch and said further switch having to be closed
to e?ect loading, means for automatically mov
ing said further switch from open to closed posi
tion, a pump driving motor having an electrically
It will be appreciated that I have provided
actuated starting switch, an operating magnet
(5 during the time when the latter is coming‘up
to open the circuit of said unloading means con
trol, means operative on closing of said starting
for the latter having a control circuit established
, an exceedingly simple and very effective arrange
ment for maintaining a ‘compressor unloaded ‘ by said ~further switch when the latter is moved
to speed. Moreover, with a minimum of- mech-_
anism, this function is accomplished, and the
compressor system enabled to operate under the
load-and-unload system of output control.
While I have in this application speci?cally
described one embodiment which the invention
may assume in practice, it will be understood
that this embodiment of the same is shown for
purposes of illustration and that the invention
switch due to movement of said further switch
into said magnet circuit to establish a circuit
in parallel with said further switch for main
taining said operating magnet energized, and
'means operable to open said parallel circuit and’ >
deenergize said operating magnet. .
6. In combination, a pump having unloading
means, a driving motor for said pump, a starting '
switch for said motor having an operating mag
may be modi?ed and embodied in various other ' net, controlling means for said unloading means
including an operating solenoid energized to ef
‘forms without. departing ,irom its spirit or the
scope‘ of the appended claims.
,
What I claim as new and desire to secure by
Letters Patent is z‘ '
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I
1. In combination, a pump having unloading
means, pressure responsive controlling means for
said unloading means, a driving motor for said
pump, motor controlling means includinga mem
ber movable from one predetermined position to
fect loading, separate circuits for.said magnet
and solenoid, a switch ‘element operative in dif
ferent positions thereof to establish said separate
circuits, and means operable by said magnet for
maintaining a holding circuit through said mag
net.
.
.
.
‘
.
,
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"'7. In combination, a pump having unloading
means, a driving motor for said pump, .a start
,another to start said motor and out‘ of the, lat‘ ' ing switch for said motor having an operating
magnet, controlling means for said unloading
ter position while said motor continues to oper
ate, and means operative in the second’prede
means including an operating solenoid energized.
termined position of said member but not-in the to effect loading, separate circuits for said mag- ,
position occupied thereby during normal motor net and solenoid respectively, a switch element
70 operation to render said pressure responsive con
operative in different positions, thereof to form 70
an element of said separate circuits, means for
trolling means ineffective to render said unload
ing means inactive.
‘
‘
' '
automatically restoring said switch element, when
.2. In combination, a
having unloading moved'therefrom, to a position to form an ele-,
means,.pressure responsive‘ controlling means for ment, of the ‘solenoid controlling circuit, means
said unloading means, a member having to be in operative on closure of said starting switch due ‘I
4
2,184,698
- to movement of said switch element into said
taining a pump discharge pressure responsive
magnet circuit to create a holding circuit around switch, a switch element operative in different
said switch element for said magnet, and means - positions thereof to establish said separate cir
cuits, means for normally maintaining said
operable to open said holding circuit and deen
switch element in the solenoid circuit and for
ergize said‘ magnet.
‘
_
automatically returning it thereto after move
8. In combination, a pump having unloading
means, a driving motor for said pump, a starting ment to establish the magnet circuit, means oper
ative on energization of said magnet due to move
-switch for said ‘motor having an operating mag
net, controlling means for said unloading means ment of said switch element into said magnet
circuit to shunt said switch element in the mag
10 including an operating solenoid energized to ef
fect loading, separate circuits forsald magnet net circuit, and dashpot means retarding move
and solenoid respectively, the circuit for said
solenoid containing a pump-discharge-pressure
responsive switch, ‘a switch element operative in
10v
ment of said switch element out of the magnet
circuit.
12. In combination, a pump having unloading
means,‘ a driving motor for said pump, motor
15. di?erent positions thereof to form an element of _ starting‘ ‘and stopping means including a member 15
said separate circuits, means for automatically
restoring said switch element, when moved there
'20
from, to a position to form an element of the
solenoid controlling circuit, means operative on
closure of said starting switch due to movement
of said switch element into said magnet circuit to
create a holding circuit around said switch ele
ment for said magnet, and means operablelto
movable to a predetermined position to e?ect
motor starting and thereafter movable out of
said position without stopping said motor, pres
sure responsive controlling means for said un
loading means requiring the positioning of said
member out of said predetermined position there
20'
of to enable loading, and controlling means for
the positioning of said member.
13. In combination, a pump having unloading
9. In combination, a pump having unloading means, pressure responsive controlling means for
said unloading means including an operating sys
means, a driving motor for said- pump, a starting
switch for said motor having an operating mag- ) tem in which the operating medium is controlled
net, controlling means for said unloading means both in response to pump discharge pressure and
through the position of a control element, a driv
including an operating solenoid energized to ef
fect loading, separate circuits for said magnet ing motor for said pump, and controlling means
open said holding circuit and deenergize said
magnet.
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,
and solenoid respectively, a switch element oper- ‘
for said driving motor requiring the positioning
ative in di?erent positions "thereof to form an of said control element in'a position to preclude
pump loading to effect motor starting, but not
element of said separate circuits, means forv auto
matically restoring, after a predetermined time - subsequent thereto for continued motor oper
lapse, said switch element,‘ when moved there ation, and means for controlling the position of
from, to a position to form an element of the said controlling element.
14. In combination, a pump having unloading
solenoid controlling circuit, and means operative '
means, pressure responsive controlling means for
on closure or said starting switch due to move
ment of said switch element into said magnet . said unloading means including an operating sys
circuit to create a holding circuit'around said tem in which the operating medium is controlled
both in response to pump discharge pressure and
switch element for said magnet.
_
10. In combination, a pump having unloading ' through the position of a control element, a driv
ing motor for said pump, and controlling means
means, a driving motor for said pump,‘ a starting
switch for said motor having an operating mag -_ for said driving motor requiring the positioning
45 net, controlling means i'or said unloading means of said control element ina position to preclude
pump loading to effect motor starting, but not
including an operating solenoid energized to ef
fect loading, separate circuits for "said magnet subsequent thereto forcontinued motor opera
tion, and means for controlling the position of
and solenoid respectively, the latter circuit con
taining a pump discharge pressure .responsive said ‘controlling element automatically, normally
switch, a switch element operative in di?’erent maintaining the same in‘a position enabling the
effecting of loading.
positions thereof to establish said separate cir
15. In combination, a pump having unloading
cuits, means for normally maintaining said
switch element in the solenoid circuit and for ‘means, a controlling system for the latter in
cluding a pressure ‘responsive element movable
automatically'returning it‘ thereto after move
ment to establish the magnet circuit, and means ' to control the ?ow of an operating medium and
operative on energization of said magnet due to a second element also movable to control the ?ow
of such operating medium, a pump driving mo
movement of said switch element into said mag
net circuit to shunt said switch element in the tor, and'controlling means for said motor includ
magnet circuit and maintain said magnet circuit ing devices for effecting motor starting rendered
operative on movement of said second element to
closed after said switch element has been re
interrupt operating medium ?ow in said system,
turned‘ to said solenoid circuit.
11. In combination, a pump havingunloading means for maintaining said motor in operation
means, a driving motor for said pump, a starting
switch for said motor having an operating ,mag
‘ net, controlling means for said unloading means
including an operating solenoid energized to ef
iectloading, separate circuits (or. said magnet
and‘ solenoid (respectively, the latter circuit con.
40
46
50
.
60
after starting thereof, independently of the po
sition of said second element, and a further ele
ment‘movable to effect motor stopping.‘
JESS M. BARTHOLOMEW.
65
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