US1169550A - Regulating device for motor-driven compressors. - Google Patents

Description

nemen FREDERICK L. LUCKER, QF BRQKLYN, AND .[Lnll 0. CARPENTER, OF CGRNING, NEW YORK, SSIGNQRS TG INGERSOLlD-LND CGMFNY, OF JERSEY CETY, NEW JERSEY,

Application iie ecere'aer 27, 29512.

vices for compressors and more parifioularly to regulating devices of she ype w .ei-ein the mot-or is cut out at e predetermined maximum receiver pressure and out in again when the receiver pressure falls to a predetermined minimum and wherein the compresser is unloaded so that the motor can start without difliculty.

In regulators of this type the motor circuit has heretofore been provided with resistance coils which are progressively cui; out asthe motor speeds up, by purely electrical means. This has necessitated complicated and delicate systems of contacts and wiring which have heen at the same time fragile and expensive.

The chief object or" the. presentnvenl'ion is to eliminate far as possible ele control of the starting oi the motor an stitute mechanism operated inid sure, preferably from the receiver ehe compressor.

Si further object is to provide practical and comparatively simple ineens i trolling the unloading ot' the compres? bv the saine valve mechanism that operates the motor control, and also at the saine. time to control the'-,oooiing wafer circulation 'of the compressor. A l

lilith these objects in 'view we have devised a regulating system a practical einhodirnent of which is shown in the accompanying drawings in which- Figure l shows diagrammatic view of the whole system and Fig. 2 shows a detail ViewY of one of the resistance ccnrolling switches.

The system as shown in Fig. l comprises a compressor l driven by a motor 2 charging into a receiver w j is supplied to the motor through lead wires #l and Lead wire 5 connects with a series Specceticn of Letters e'teniz.

latented elan. 255, i916.

no. resem.

of switches 5, 7, 8 and 9. here shown as iour in number. These switches areV arranged to make Contact respectively with Contact. plaies lll. il, 12 cessive points in a resistance coil or series of coils'lf., swiech 6 in contact with plate l0 ehe 'lull resistance ci thecoil i4 in the niotor circuit. switches l and 8 successively less resistance. and switch 9 giving direct connection with the motor. These switches may be constructed as shown in Fig. 2 and comprise a hell crank lever having longer arm l5. which is the Contact arm, ed a shorter arin 16, which is the operating arm, the whole being pivotally mounted on a pin 17, secured in a supporting;- nog i8. These switches are ooeratedby fluid actuated motors i9, 2G, *2l and 22 each of which comprises a cylinder 23 in which slides a piston 2li provided with a connecting rod 95 which is nivotallv connected bv a pin 26 to the switch operating arm 16. A. spring 27 in the cylinder 23 normally keeps the piston 24 end holds the switch in open position. To the motors il), 20.21 and 22 fluid supply ducts 28, 29. 3G and 3l lead from ports 32, 3B. and in a valve chest which is in the iorni oi' a cylinder'having portions of la rger and smaller diameters. Sliding the valve chest is a valve 3l which consists of two portions, one sliding in the larger diameter part. of the valve chest and the other in the snialler diameter part. The larger diameter port-ion oi the valve 37 is in the forni oi a spool with two heads 38 and 39. The head is provided with a peripheral pori -lfO which is connectedby a transverse passage Lil and longitudinal passage l2 with the valve chest at the farther end ofthe spool.

From the intermediate part of the larger portion of the valve chest 35 a passage 42 leads to the atmosphere and is in constant communication with the. annular chamber ormed hy the shank of the valve 3?. From the larger end of the valve chest a passage 43 leads to a second valve chest 44. vValve chest se also has cylindrical bore of two diameters in whichsiirles a valve 4:5 having a smaller dialnet-er head LlG- and a larger diameter head e?. From the smaller diameer portion of the valve. chest a fluid duct #i8 leads to the receiver. From the and 13 connecting with sncf.

eol

' r presser here central part of the valve chest 44 a passage 49 'leadsto the atmosphere the size of its outlet being controlled by a needle valve 50 adjustably threaded into the valve chest. From the larger diameter end ofthe valve chest 44 a ipe 5l leads to an auxiliary controlling va vve 52. This valve 52 is connected to the receiver by pipes 53 and 5 4 and its construction forms no part of the present invention being 'fully described in the c0- pending application of W. `f`.V Treiber and E. L. Bullrley, No. 703,644, liled June 14th,

'- 1912. It is suicient to say-here that its construction is such that' at u predetermined maximum pressure 1n the leceiver 1t oper-' lates to permit fluid at receiver pressure to enter the pipe 51 and when the receiver pressure falls to a predetermined minimum it opens the'pipe 51 to atmosphere through the exhaust opening 55.

Referring again to the valve 37 its smaller diameter pori lon consists of a rod 56 secured to the head 39.; rod 56 having on its outer end a head 57 fitting the smaller diameter portionof the valve chest. From the inner end of the smaller diameter portion a port 58 leads to the atmosphere while from the outer end a pipe 59 leads to' a valve 60 'which controls the speed of movement of the valve 37. This valve G0 comprises a valve chest 6l from the lower end oi which a pipe 62 leads to the receiver. Surrounding the opening around the pine 62 is abeveled valve :seat` 63 against which seat-s a check valve 64 which is held toits seat hy a spring 65, the air oe ing thus afforded freefpassage in one direction, that is,` from the receiver to the mpc .39

leading into the valve chest A restricted kpassage ttor the air in the' other ldirection is provided by a needle valve 66 which seats in' a beveled openingl GY in the valve. 64 and is adjustably threaded in the valve. From a point in the smaller diameter 'portion of the valve chest `36 intermediate between the ab mospheric port 5S and the inlet pipe 59 a pipe 68 lcadsto an unloader for the com shown diagrannnatically-as a vaive 69 actuated by a piston 70 to open the discharge line 7l ofthe compressor toatmosplierevwhen pressure is admitted to the .Acv check valve 7-1 prevent-s the escape of fluid from the 'receiver-'3,

The cylinder of the compressor rounded by a water Ajacket here shown as a coil 72 into which Water is introduced through an inlet valve 73. This inlet valve is controlled by a piston i-4 sliding in a cylinder 75 the piston being moved in one direction tofopen the valve by a spring 76 and in the other direction by fluid pressure' conveyed through the pipe 77. from the anic iliary valve y Referring again to the motor control, one or more of the switches 6, 7, 8 and 9 (here shown only asY switch 9) is provided with a' "nectcd from the receiver pressure incasso magnetic latch for 4holding it in closed poid tion. This is shown in Fig. 2 and consists of a latch 78 on the arm l5 "which is adapted to be engaged by the hoek of a latch liar pivoted near its center on a pin SG. i spring 8l secured to the other end of the latch bar'tends to disengage the latch har from the switch while .a magnet 82 is prf vided to hold it in engagement with the switchwhile current is passing through the magnet coil. @ne terminal cf the magnet coil is connected. to the lead wire el while the other is connected to the lead wire through 'a luirl operated switch 83, Tliris switch consists of a cylinder 84 in which slides a. 'piston 85 provided with a rod 86 the ngi-per end ot" which is secured to the switch l 'il which is adapted to connect tif/'c conta. s and 32 connected respectively with the andwith the lead aire ihrongh the megnet 32. The piston is held 'ncrreally in its lowermost positicn spring conne-c tion thus being mada between 'the e and S9 and current oassed throngh net S2, holding the switch 'in classe posi tion. From the lower end o?? the 84 a pipe @l leads to the auxiliary more and is adapted'to convey ii'zid under pres 'In operation, when the in the re ceu/'er reaches a pressure which is deterlnmcd bythe adgustmen', el the a: l

receiver pressure to the pipe 5l. This pipe is connected with .the larger diameter igortion of the valve chest il Whilethe other end of the faire chest 44 lilies-isc in communication' with the receiver through the pipe 48. As the .heed .47 of the valse 45 is Alarger than the l; more upwardly, is the port 43 the valve chest 3i;

s -ne disconin pipe 48 and connectedto the atnnisphere 'ongle the port 49. is there is' constant receiver pressure in the arther end of the valve chest. ori-thc smaller diameter head 57 the v'alvel? will move to the left. This Will allow receiver pressure'to intothe pipe GS andV open the discharge line valve ill of the compressor to atmosgiherethrough the vaction of the receiver pressure .catho piston 70. By theoperationdf auxiliary valve 52 fluid under pressire isA also admitted under the piston 8-5 moving it upwardly and breaking-the contact connection between the contacts 88 and 89' and hence. (lecher-rising the magnet S2. This allows the springu 8l to release they latch bar I9 from its' engage will he ele'- yes.

Wire e .cel-er A laryvvalve 52 this valve will operate ad nttingj l A' 'i Valve will' nient with the switch 9 and allows the' serves in Conway jessm'e :n dose the Swich 1s open 'i h ,mwa Aga S.. mrougn L e pm L ml navmg startled to mmv acti-1m 0f the aux als@ a ,o CVV fallen te a Wmmuand the coong regulations nke :y ausl?.

T'vheu by Ta the csmpl-essoy justmen# of m 511km' he switch. 87 again to make Connection with she conacis 3Q mii s 1 to 'Sow thyough h@ c tem. The pressme the lower pari;- o

the head 46 of he mh' 48 valve mil moife c receiver valve cheg U6, ini at ik@ extrme t (ai ns it Inf/ves is mth the pmt 3' 'Hu-lf?, Wifi ne admitted hx'uugh ik@ passge $2, L Li() into the pipe lending to 'he mfr-tor 9. This will move Cw 'pistou :'24v of this motor upehe e mona Wudly forcing 'the sich commi 1G und :mance-img; i. with im full lessanse ,of its @i NICE ihk' port sh wing' and description discloses @Bly alla specsd modicaion of he invention and @they and mn'catons ae ndude 4in the Sp' Q @she invention as on? a uomprassfo, its re y {rsvq th@ compresso? 01" @ne @param ated Switch com-EOL l, a ud actuated jeg and auxiliary valve which said fluid ducts ychest for serially admitting fluid to said ceiver, a motor for I mechanism for yerating arcas,

from the smaller surface to vary era-ting said switch sistance, i operating said switches, a fluid operated uniluid actuated loader for the compressor, a

valve having one portion serving to admit fluid pressure progressively to said switch motors and another portion serving to control said unloader and means to admit iluid pressure to actuate said valve at prede-` termined receiver pressures.

1i. In combination, a compressor, its redriving the compressor, the motor circuit, switch cutting in the motor and `said resistance, fluid actuated motor mechanism for actuating said switch mechanism, a fluid operated unloader, for the compressor, a vfluid actuated controlling valve having one portion serving to supply iluid progressively .to said motormechanism, and another' portion serving to operate said unloader, a iluid operated switch for cutting out said motor and auxiliary valve mechanism for actuating said controlling valve resistance in and said iluid actuated switch at prede termined receiver pressures.

5. In combination, ceiver, a motor for resista-nce in the motor circuit, a series of switches for cutting in the motor and decreasing said resistance, fluid actuated motors torV operating said'switches, fluid ducts to said motors, a valve chest from lead, a valve in said a compressor, its remotors, said valve having diierentialA opmeans to admit receiver pressure constantly. to the smaller operating surface, means Ioperating 'at predetermined receiver pressures to'expose the other surface to receiver pressure to' operate the valve, and .to the atmosphere'to restore it to position, and means to vary the exhaust lthe speed of. valve movement.

6. In combination, a compressor, its receiver, a motor for driving said compresser, resistance in the motor circuit, a for cutting out said motor, an unloader for said compressor, means for opand unloader at a. pren determined maximum receiver pressure' switchA mechanism for progressivelyv cutting in said motor circuit, iuid actuated motor mechanism for actuating said switch mechanism, said motor mechanism oeing adapted mechanism und 'throwing on at a predetermined minimum receiver pres* sure. y I y 7. lnv combination, a compressor, its redriving the compressor,

- motors for closing said switch mechanism from no' ceiver, a 'motor ordriving the compressor, resistance in the motor circuit, a series o switches for cutting in the motor and pro-y gressively cutting out said resistance, ilui` actuated motors for actuating said switches, a fluid actuated sliding valve for successively admitting pressure to said, switch motors, means for admitting fluid pressure 4to actuate said valve at a' predetermined minimum receiver pressure, and means to vary the speed of said valve;

S. In combination, a compressor, its re ceiver, a 4motor for driving'said compressor, resistance in the motor circuit, switch mechanism for progressively varying' said resistance,. luidl actuated motor mechanism for actuating said switch mechanism, sai motor mechanism 'being adapted to operate said switch mechanism from no load to full load at constan iluid pres'silrlt, and means for admitting fluid to said switch. motor mechanism vat a predetermined pressure' in said receiver.

9. In combination, a. ompressor, a receiver, a motor for' driving said compressor, resistance in the' motor circuit, a ,series of .switches for progressively varying ysaid reinfr motor., resistance in mot-or circuit, a

series of switches for varying said resistance, fluid operated motorsL 'for actuating said switches, means for serially introducing motive iluid into,` and exhausting said motors,

a magnetically controlled latch for locking 'A one of said switches in closed position, an

means orreleasing said latch at a predetermined fluid pressure.

il. In a fluid ope mechanism, a motor circuit, resistance in suid'circuit, a, series of sivitchesor progressively cutting out said resistance, iluid motors for closing said switches, pressure operated valve mechanism for serially com -nesting said motors with ay source or" duid pressure, and auxiliary valve mechanism .to

iadmit luid pressure to operate said motor valve mechanism. 'f 1Q. In a fluid operated motor starting mechanism, a motor circuit, resistance in said circuit, a. series of switches for progressively cutting out said resistance, fluid said switches, pressure operated valve mechanism for serially. con-- necting said motors with 'a source of fluid pressure, auxiliary valve mechanism to admit fluid pressure y valve mechanism, and the speed of said motor valve meclfianivi3. In a duid operated motor ster ated motor starting Lio to oper'ate'said motor. f ,means for 'regula i g;

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