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be obvious that the ratio between the -decreases of the fuel quantities supplied by the pumps can be altered to any desired rate by suitably adjust ing the lengths of the parts-of the linkage actu ating the levers |02 and ||8 or by varying the places of ’the fulcrums ||0 and |26, -or by vary ing the lengths of the connecting rod |22 byV means of the turnbuckle |30. l . Since the reduction of the stroke of the plunger ||4 upon decrease in load is`greater than the reduction of 'the stroke of the plunger 92, the projection ||6.of the plunger ||4 will be lowered at a certain low load to such an extent, thatl the plunger rod |66 will be moved downwards ou: of the path-of the cam 28 so that the pump 14‘will the chamber 56 so that a new combustioncan be started therein immediately upon increase in load. ' of the fuel supply conduits 224, 226, 228, and 230 Control ofthe plant described iseffectedmanu ally by means of a controlling device diagram matically indicated by a control lever 232 which is pivoted at 234 and which acts upon the four fuel-pumps by means of a link 236 engaging four levers238,240,242,and244. Theseleversare linkedtolevers246,y248,250,andy262,respec tively,which areprovidedwithabuttingsurfaces adapted to engage the respective plungers of the fuel pumps in the manner described with refer ence to the pumps shown in Fig. 1. The levers 23a-244 have different leverages such that upon displacement of the link 236 the turning move ment of the lever 252 will be greater than that of >the lever 250 and still greater than that of the 22,201 f 3. beentirelyputoutofoperation. In>thiscase,' fuel is supplied to the high pressure combustion chamber 50 only, and no reheating of the motive fluid takes place in the low pressure combustion chamber56.Acustomarypilotburnernotillus-~ pumpsareillustratedinthediagramshownin trated in the drawings is preferably arranged in Atlow>loadstherod|44is_movedsofartotheY offuelsuppliedbythepumps|88,|90,|92,and right that it engages the valve stem |42 and opens the >valve |36 with the result that a por are supplying their maximum quantity of fuel. |94,respectively. Atfullload,allofthe.pumps tionoftheairdrawninbythelowpressurecom- ' Atapartialloadathefuelquantitieswillbepro pressor will be blown out through the bleeder duced, the reduction being greatest for the pump pipe |34. Thereby the’ amount of compressed 30 |94 which supplies fuel to the combustion cha‘m air will be reduced so as to correspond to the decreasedamountoffuel.`V'I_‘hepositionofthe aperture |32 is preferably such that the air dis charged through the conduit |34 has not been compressedtoaconsiderabledegree. Suchcon trolmeansanditsoperationisdescribedinde |88 is in operation. ' I ' tail in my copending patent application, Serial Th'e low pressure turbine |14 is in operation No. 71,363, filed March 28, 1936. , at high loads only. In order to put this turbine ’ For starting the aggregate, the valve 68,is outofoperation,thereisprovidedaby-passcon ' closed‘and the starting motor 66 is put into 40 duit 262 between the combustion chamber 2|0 operation. When the compressor aggregate is sufficiently speeded up to’produce a certa-in quantity of compressed air, the valve 68 is opened and the turbine 20 will then be started by com ‘pressed air and operatethe fuel pumps so as to supply fuel to the combustion chambers. The embodiment of the _invention illustrated in Fig. 2 comprises four turbines |68, |10, |12, and |14 coupled in series and operating on sepa rateshafts. Thehighpressureturbine|68drives an intermediate pressure compressor |16, a high pressure compressor |18 and four cams |80, |82, |84, and |86 for actuating four fuel pumps |80, 19,0, |92, and |94. The intermediate pressure and the turbine |14. The by-pass conduit has a valve264which at high loads is maintained closed >undertheactionofaspring266. Thevalve264 can be opened by means of a link system 268 which can be actuated 4by the control lever 232. The left-hand end position of the control lever corresponds to full load. .As the lever is-moved towards the right the output of the plant is gradually reduced, and the right-hand end posi tionofthelevercorrespondstonoload. Upon opening of the valve 264 the motive fluid` ex- . hausted from the turbine |12 will be-discharged through the conduit 262 so that the low pressure turbine >|14- will come to a rest. In order to 'turbines|10and|12drive,bymeansofasuit-‘ simultaneouslyputthelcwpressure.compressor able gearing |96, |98, 200, >the propeller 202 of a' vessel. Eachturbineisprovidedwithaheating chamber204,206,208,and2I0,respectively. The low pressure turbine |14 drives a low pressure compressor 2|2. 2|4'indicates a starting motor adapted to start up the compressors |16 and |18. The air compressed in the low pressure com pressor is supplied to the intermediate pressure compressorbymeansofaconduit2|6. 2|8isa 2|2 out of operation, a valve 210, provided in a branch conduit 212 is opened .by a suitable link-- age214actuatedbythecontrollever232sothat air will directly pass from the latmosphere through the conduits 212 and 2|6 to'the inter mediate pressure compressor |16. ._ The gas turbine plant illustrated in Fig. 4 com prises two gas generators, one generator being providedforrthehighpressureturbine216and the other one for the low pressure turbine 218. ‘The gas generator for the high pressure turbine comprises a combustion chamber 280 in which fuelisburntonastoker282. Fuelis’supplied to the Stoker by means of a suppiyiconduit 284 « conduit for supplying air compressed in the inter mediate pressure compressor to the inlet of the highpressurecompressor. Thefinallycompressed airpassesthroughaconduit220tothehighpres sure combustion chamber 204 and thence through theconduit222totheinletofthehighpressure_ providedwitharotatablesluicevalve286oper iturbine |68. The fuel pumps are constructed and operate in the same manner as described with referencetothefuelpumps12and14intheem ated by an electric motor diagrammatically in " dicated at 288. 290 designales an electric motor fordrivingthestoker282. Belowthestoker "bodimentshowninFig.l.>Theyareconnected thereisprovidedanashchute292havinglaro to the respective combustion chambers by means ' tatable sluice valve 294. The lower portion of llever 248, the movement of whichwill be greater than that of the lever 246. » The quantities of fuel supplied by the different Fig. 3, in which the abscissae indicate the load on the plant in percent and the ordinates represent amounts .of fuel supplied by the pumps. >The lines 254, 256, 258, and 260 represent the amounts ber 2|0 operating at the lowest pressure. At a load.indicatedatbthepump |94isentirelyput outofoperation. Uponfurtherdecreaseofthe load down to c also the pump |92 comes toa rest. Between no load and the load d. only the pumpPDF Image | Lsholm Turbine Plant 1942
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