US903487A - Power-generating system. - Google Patents

Description

-' H. LEMP.

POWER GENERATING SYSTEM.

APPLICATION yum) JULY 15, 1899.

Patented Nov. 10, 1908.

in v 5 w Maggi g Wbn-esses 'nvenbof: Hermann Lemp,

HERMANN LEHP, OF LYNN, MASSAOHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

POWER-GENERATING SYSTEM.

To all whom it may concern:

Be it known that I, HERMAN LnMr, a citi Zen of the United States, residing at liynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Power-Generating Systems, of which the following is aspeciiication.

- My inventionv relates to power generating systems in general but is illustrated in the form particularly used for operating auto-v mobiles, in which service the demand for energy is subject to sudden and wide variations. The energy required to drive an automobile varies principally with the speed, the weight carried and the character of the route traveled.- In order to operate such avehicle with a maximum degree of economy, the supplies olfuel and water to the generat-. ing apparatus should vary with the load on the engine and in substantially the same degree.

of a power generating system of improved construction which will operate with the de-- sired economy under the varying demands made upon it forenergy and will require a minimum of care and attention on the part of the operator.

,In carrying out my invention, a tank or other source of fuel supply is placed under a relatively small initial pressure or head sufitieient to supply the fire chamber or burner of the boiler or other vapor generating apparatus when the fire is banked. A power and imparts the pressure necessary to de sure therein.

water pump is in connection with a regulapump is employed to impart servicepressure to the fuel. A regulator controlled by the vapor pressure on the engine ormotor is pro vided to regulatethe effective delivery of the fuel; pump in substantial accordance with the demand for energy Another pump draws a supply of water from a tank or other source liver it to the boiler against thevapor pres- The delivery conduit of the tor, subject-to the va or pressure in the boiler, which controls tlie effective delivery of the pump in general accordance with the demand for energy.- The pumps are of substantial size, require no careful adjustments, and are capable at all times of furnishing an excess of water and fuel; the regulating devices being arranged to automatically take care of the excess. This arrangement is a very satisfactory one and eliminates objec- Specifieation of Letters Patent.

Application filed July 15, 1809. $eria1No. 723,900.

The ob'ect of the invention is the rovision- "the exhaust pass'es from the engine.

Patented. Nov. 10, 1908.

tionable conditions which would result it the system were designed to supply water and fuel in exact quantities with respect to the demand. J

In the accompanyin g drawing, which represents an'einbodiinent of my invention, Figure 1 is a diagrammatic representation of a system comprising a steam engine, boiler and the necessary pumps, tanks, piping, etc.,

and'Fig. 2 is a sectional view of a regulatingvalve.

The boiler shown consists of a seamless tube A of suitable bore, coiled or bent in any desired manner so as to present a large surface to the burner flame. The boileris preferably divided into. sections and the inner .end of one'section is connected to the outer end of another section, the main steam pipe being co'niiected'to ap roxiniately the middle of theboiler. A )oiler constructed in this manner possesses certain features of advantage which are set forth in another ap plication of mine S. N. 6805, filed Feb. 28, 1900, but the invention is not limited to this particular form of boiler. Other forms or constructions may be used, if desired.

Surrounding the tube or tubes and consti- I tuting a fire chamber is a casing or lining B,

composed of fire brick or other heat resisting material which confines the burner flame and at the same time shields the body of the vehicle or other sup ort from excessive heat.

Surroundingthe re-brick lining is a 'metallic casing C having a suitable bottom and a top provided with an extension C containing'an opening through which the prod-' openings O are rovided in the sides of the casing C throug which the air may enter, as 1Hd10lt6d-by the arrows, to combine with the fuel. The construction and, arrange,

ment of the up and down flues isnot claimed herein, as it forms the subject matter of a separate appjlication, filed by me November 2, 1900 an earing Serial No. 35254:.

- Anysuitable type of-engine maybe' employed in connection with my invention, the one shown being a single acting vertical engine. One end of the cylinder E is connect- I ed with the boiler by pipe F, and the admission of steam thereto 1s regulated by the throttle G. The exhaust from the cylinder passes through pipe H to the chamber D over the boiler, thence'to the external air by the or approximately constant speed either by or .maximum amount 0' water re uire down flue D I For theurlpose of supplying water to the boiler and e independent of the engine,as certain advantages will follow in these cases.

As illustrated-in. the drawing, H represents awater ump and Ian oil pump preferably 0f the displacement type. the cylinder of the water pump H? is connected to the boiler by the ipe H and the other end is connected t o t 'e water tank J by the pipe H. An air chamber or dome H is operatively connected to the pipe H Connected to the water pipe H is a relief valve V, of any suitable construction, which. is designed to take care of the excess of Water supplied by the pum and'is set to ive the by the boiler. Leading from the relie' valve to the Water tank J is a ipe V that conveys the excess of water bac to the tank. v

A small manually actuated pump O is used to give an initial Water pressure at the time of starting. Shunting the cylinder H K through the pipel and connected to the pipe H at a point opposite the dome, isa-pipe H This pipe is provided with a check valve h so thatwater can be forced into the boiler by the manually ac-.

tuated pump; this arrangement being employed when for any reason the pump H is not running.

One end of the cylinder of the oil pumpI is connected to the oil tank by the pipe I and the other end is connected to the oil feed pipe Connecting the pipes 1 and I is a short piece of pipe containing the check valve 1 This check valve is so arranged that it permits the liquid fuel to flow from pipe I to pipe I underthe action of the air pressure in the tank N but prevents its passage in the opposite direction under pressure from the pump. In addition, the

to the burner, two umps are provided which are either driven irectly by One end ofphr Fig. 2, in which L represents the casing or I base, and mounted therein is a diaphragm L Securedto the casing is a cylinder L containing a piston L arranged to press on the diaphragm L and cause the latter to en' gage a seat L and close the Opening l'eading to pipe K.

To prevent leakage around the piston'an'elastic packing -Z is employed,

which completely surrounds the piston and is firmly seated between a nut and a shoulder'on'thecylinder. The ratio of the areas of the diaphragm and; plunger are, roughly, as one to six, but this ratio can, of course, be

made anything else depending u on the rela tive dimensions of the burner and engine, but once this ratio is determined it need not be altered, the throttle valve R being used for final adjustment. Secured to the upper end of the cylinder is a pipe M which isv directly y, connected to the steam pipe between the' throttle valve Gnand the engine, conse- .quently the steam pressure in the pipe M cor- When for responds to that on the engine.

Ppressure in the pipe 'anyfreason the relative M falls below that in t agm rises and permits a certain amount of the liquid fuel to pass from pipe K to pipe e pipe K, the dla-i K and thence throu h the pipes 1 ,1 and 1 thereby forming a. ocal circuit. As soon as the difference in pressure between the pipe K and the pipe 'M'ceases, all of the oil will flow from the tank to the burner.

Oil or other fuel is supplied tothe burner from a tank N, and in order to furnish'an initial pressure at the time of starting the engine a small handpump N is employed this pressure is ordinarily about five pounds,'but it can be varied therefrom if desired. By constantly maintaining the fuel tank N under a small or initial pressure, fuel will be supplied to the burner or firechamber at all times, whether the power fuel pump is working or not.

The construction described is also advantageous because onlyv a relatively. small amount of fuel is under high pressure, hence the danger due to broken pipes, particularly if gasolene is employed, is reduced to aminimum. The system is so arranged that there are two connectionsv from the tank to the burner. One of these connections includes the power ump L-while the other connection inclu es the regulator L. When the diaphragm L of the regulator is raised, fuel passes directly from the tank'to the burner, but when the diaphragm is seated, the fuel passes through the power pump. When the pressure due to the pump and that of the supply tank are somewhat nearly equal, both i the steam inlet pipe F.

' upper end of the rack Q The rack is moved by a'pinion that is connected to a lever or other suitable actuating device. 7 The burner shown forms the subject matter of 'a separate application filed by me January 28, 1901, bearing Serial No. 45,028. Tests made with a vehicle equipped in accordance with my invention show that under various running conditions the steam pres sure on the engine will vary proportionately with 'the work to be performed, it being greatest when running on a level at fast speed or when ascending a steep grade.

The speed of the vehicle can be accurately controlled by the opening and closing of the throttle, providing the boiler pressure is .maintained practically constant.

There exists therefore a definite ratio between'the steam p essure necessary to turn the engine and the pressure necessary on the burner, which ratio is constantithrough a very wide range and covers all practical conditions.

The general operation of my invention is as follows: The burner is first heated by a torch or other auxiliary device, after which the fuel in. the tank N is put under a small air pressure which forcesthe oil through the pipes K K and. K, thence through the vaporizer to the orifice in the part 1. There being n'ii steam pressure in the pipe M at this time, the diaphragm L will rise against the weight of the piston L and ermit the fuel to flow to the burner. l fter t e boiler has been sufiiciently warmed,-water is pumped into the boiler by the manually actuated pump 0, and as soon as. turned into steam is admitted to the engine through the pipe F and,

throttle G. As soon as the engine starts into operation both water and fuel pumpsbefgin to act and force water into the boiler on/one hand and oil into the burner on the other.

As the demand on the boiler for steam in.

creases, due to any cause, the amount of.

water flowing back to the water tank through the relief-valve or regulator V decreases.

The more the throttle is opened the nearer the steam pressure of the engine will be to that of the boiler, and consequently thepressure on the piston L will be increased; In

' other words, the overflow valve of the oil supply will be weighted and a greater pressure VVlll, therefore be exerted on the fuel ser vice and more fuel. will be consumed in the itle the diaphragm is more or less firmly scatburner. Closing the throttle G will cut off I a comparatively high pressure, even after the pump I'has ceased to operate. As soon as the pressure drops to that of the fuel tank the amount of fuel which is forced through the burner will be greatly reduced, but a Sllffk' cient amount, due to the pressure created by the hand pump N will flow to maintain the vaporizer and the boiler tubes at a temperature-for immediate starting. On account of the exhaust passing through the chamber D and'the down flue 'D any increase in the amount of the exhaust will correspondingly increase the draft on the burner. As the amount ofsteam admitted .to the engine is decreased, the draft on the burner is simultaneously and correspondingly decreased. This means that the draft on the burner is automatically varied to meet the conditions of service. Hence there will be no choking of the fire gases within the boiler under any conditions. With this method of control, the operator is entirely free from care as regards the fire and the steam pressure, the fire automatically increasing With the duty-performed by the carriage, and vice versa. 7

When the systemis running, the water pump H furnishes an excess of Water, which excess is taken care of by the adjustable relief} valve V. VVhenthe engine is making a great" demand on the boiler for steam very little Water returns to the tank, but as the demand for steam decreases more and more water will forceits Way through the valve and back i to the tank. YVhile under running conditions it is evident that the pressure on the steam side of the regulating valve L must vary due to momentary changes in steam pressure on the engine, caused by changes in speed. or load, consequently: the amount of oil which flows from the pump to the burner is varied; If the pressure is low the diaphragm will rise and therewill be a local oil circulation, but as soon as more steam is admitted to the engine by opening the throted over the end of pipe K and more oil is forced to the burner.. 1

Those features. of my invention relating to the fuel system alone have been divided out at the requirement of the U. S. Patent Office under the provisions of Rules 41 and 42, and form the subject matter of a divisional application, Serial No. 157,546, filed May 18, 1903.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my-invention, together supplying fuel to the burner which is unde the control of the engine pressure.

2. In combination, a boiler, a burner I I therefor, an engineconnected with the boiler,

a pump for supplying liquid to the boiler, means cooperating with the'pu'm'p for rendering=its efiective delivery dependent upon the boiler pressure, a pump for supplying furl to the burner, and means for rendering the t effective delivery of the fuel pump dependent upon the engine pressure.

.3. In combination, a boiler, a burner,

' pumps-for supplying water and fuel respectively to the oiler and burner, an engine which is connected with thepumpsfor driv-' ing the same, means for controlling the effective delivery of the water pump according to the lpressure in the boiler, and-means for contro 'ng the output of the fuel pump according to the steam pressure of the engine.

l/In combination, a boiler, a burner therefor,jpumps for supplying water to the boiler and fuel to the burner, an engine, driving connections between the engine and,

I pumps which permit the supplies of the pumps to vary as the speed of the englne varies, and means under the control of the steam pres-- sureof the engine which variesthe amount of fuel supplied to the burner independently of variations in the action of the pump.

5. In a power generating system, the com bination of P boiler, a burner therefor, an en-' gine, pumps tending to supply liquid to the boiler and fuel to the burner in definite proportion, means intermediate the'pump' and I boiler for varying the supply of liquidto the latter, and means independent of the first means and dependent upon the engine pres sure for varying the supply of fuel to the burner. M v

6. In a system of power generation, the' combination of a boiler, a burner therefor, an

engine, um tendin to sn 1 li uid to the boildi an d fuel to %he burllgr in definite proportion, and means operating inde ends ent y forvarying the supplies. of liqui and fuel; one of said means being-dependent upon the engine pressure. I 7. In a system of power generation, the combination of a boiler, aburner therefor, an

liquid to the boiler and fuel to the burner in 8. In combination, an engine, a boiler controlled by- I from opposite sides of the which requires that water shallbe continu'-" ously pumped into it, a Water pump which is driven by the engine and works against thepressure on the water-endof the boiler, a res lief valve for the pump, a burner, a fuel pum which is also driven by the engine, a

regu ator therefor, whichis controlled by the 'steampressure on the engine side of the throttle, and a throttle-valve which admits steam to the engine and regulator and also controls the pressure on the Water end of the boiler.

9. In apower generating system, the combination of a boiler, means including a regulating device for supplyin' water to the boiler, and means for supp liquid fuel to the boiler including a regu ating valve having an inlet. and an outlet, a-diaphragm for controllingfthe 'connectionbetween theinlet and outlet and a pressure actuated device for moving the. diaphragm.

10. In av power generating system, the combination of aboiler, means including. a regulating-device. for supplying water to the boiler, means'including conduits for. su plying'liqui'd fuel to; the boiler, and a regu ator for the fuel supply located in one of the conduits comprising a diaphragm which under the influence of the fuel pressure tends to keep the conduit open and a piston actuated by the engine pressure which tends to-move the diaphragm against the fuel pressure to close the conduit.

H. In a ower generating system, the combination of'a boiler, a pump supplying water to the boiler, and means for su ply-ing fuel to the boiler including a regulating valve comprising fadiaphrag'm, a seat, and means for moving the diaphragm relative to the seat; to control the flow through the valve.

12. In a power generating system, the combination of an engine, 'a boiler which furnishes steam to the engine, a pump supplying water to' the boiler, and means for supplying fuel to the boiler including a .reguating device comprising a base having a chamber With inlet and outlet openings'and an annular seat surrounding one of the openings, a diaphragm mounted in the base above the seat, a cylinder secured to the base-above the diaphragm, a piston in the cylinder having its lower end in engagement with the diaphragm, and a connection for admitting eng ne pressure to the cylinder tocause the piston to remove the diaphragm relative to the seat to regulate the flow through the chamber. engine, a throttle, pumps tending to supply a fuel tank maintained under an initial pres- 13. In a power system, the combination of automatic regulator controlled by the de-' sure, a fire chamber to which fuel flows under the pressure in the tank, a generator heated by thefire chamber, an engine receiving vapor from the generator, means for supplying fuel to the fire chamber at a pressure greater than that on the source, and an automatic controlling valve working underthe engine pressure for regulating the supply of fuel at .the'different pressures to the fire chamber! 14. In a power system, the combination of a fuel tank adapted tobe maintained under an initial pressure, means for placing the fuel tank under pressure, a burner, a boiler heated thereby, a casing which receives the fire gases from the burner and is provided with a down-draft flue, an engine receiving steam from the boiler and exhausting into said line, a pump driven by the engine for increasing the pressure of the fuel in the system and delivering it to the burner, and an mand for steam which decreases the supply of fuel to the burner coincident with the decrease in the amount of exhaust from the engine.

15. In a power system, thecombination of a fuel tank, a burner, means located between the tank and burner for increasing the pressure of the fuel in the system, a boiler heated by the burner, a casing for the boiler having a down-draft flue, an engine receiving steam from the boiler and exhausting into the flue, and means for increasing or decreasing the supply of fuel to the burner according to the quantity of steam supplied to and exhausted from the engine.

16. In a power system, the combinationjof a fuel tank maintained under an initial presan initial pressure, a pump for placing the fuel tank under pressure, a burner, a boiler heated thereby, an engine, a throttle-valve controlhng the supply of steam to the engine,

a second pump driven by the engine which delivers fuel to the burner from the fuel tank at an increased pressure, and an automatic regulator working under the steam pressure on the engine side of the throttle for regulating the supply of fuel to the burner.

1 18. In combination, an engine, a boiler having a burner and supplying motive fluid to the engine, a source of fuel, a ump receiving fuel from the source and de ivermg it to the burner under high pressure, means utili zin the engine exhaust for creating a forced draft on the burner, a valve-control ed draft.

tor heated by the burner, a vapor-consum tion device, a throttle controlling the supp y of vapor thereto, and a means for actuating said valve which is controlled by vapor pressure on the delivery side of the throttle.

20. In a power system, the combination of a source of fuel supply, a boiler having a fire chamber, a pump receiving fuel from the source and discharging it to the fire chamber, a conduit between the highressure side of the pump and the fire cham er, a motor receiving motive fluid from the boiler to drive the pump, anda regulator responsive to the initial fluid ressure on the motor for suddenly reducing the pressure of the fuel trapped between the pump and the fire chamber when the pump. is shut down.

21.. In 'a'power system, the combination of a-boiler,an engine for receiving motive fluid therefrom, means for utilizing the exhaust from the engine to produce a forced draft, a

burner for heating the boiler, separate supply pipes connected to the burner, means for sup lying fuel through one pipe at a relative y low pressure, means for supplying fuel through the other pipe at a relatively high pressure, and a device depending upon the supply of motive fluid to the engine for cutting the high ressure fuel supply into service simultaneous y with the supply of motive fluid to the engine and the opening of the forced draft and for cutting the low pressure sup 1y into service simultaneously with the closing of the su p'ly of motive fluid to the engine andthe shutting down of the forced 22. In a power system for self-propelled vehicles, the combination of a boiler, an engine for driving the vehicle which receives motive fiuid from the boiler, a throttle, a source of fuel supply, a pum arranged to operate during movement of t e vehicle which is connected with the'tank and the burner, a by-pass around the pump, and a valve in the by-pass controlled by the'pressure of the motive fluid delivered to the engine to open when the throttle closes. or vice versa.

' 23. In a power system for self-propelled" vehicles, the combination of a boiler, an ena gine for driving the vehicle which receives steam from the boiler, a throttle for controlling the supply of steamto the engine, a

, initial pressure, a

source of fuel supply maintained under an ump driven by the enme and connected with-the tank and the urner for supplying fuel to the latter at a high pressure, a by-pass around-the pump a valve therein through which fuel passes to the burner under the pressure of the source,

, and means sensitive to the pressure of steam supplied to 'thefl engine for opening the bypass when thethrottle closes or vice versa,

24. Ina power system for self-propelled vehicles, the combination of a boiler, an engine for driving the vehicle'which receives steam' from the boiler, a throttlefor control- Pressure, a pump driven by the engine and ling the supply-of steam to the engine, a source of fuel maintained under'an initlal connec-tedwith the tank and the burner for supplying fuel thereto at a high ressure, a 2 0 ,1- a'va ve therein byass around the um d den y reduce the preswhich operates to su I sure on the burner by establishing communi-- cation b'etweenthe latter and the source, and

means sensitive to the pressure of the steam -25 supplied to the engine to open the valve when the throttle closes or vice versa;

25. In a power system for self-propelled vehicles, the combination of a boiler,an en 'gine receiving. steam therefrom-which drives the vehicle, a burner for heating the boiler, a source of liquid fuel supply maintained under an initial ressure, a pump driven by the engine whic receivesfuel from the source andsupplies ittothe b'urner at a high pressure, a connection arrangedin shunt relation to the pump, I a regulator therein which is. adapted -to permit the pressure-on the burner to be "quicklyirelieved ,orreestablished during operation of the. ump and also to permit fuel to feed to the urner at the pressure of the source when the pump is idle, a forced draft device which is adapted to operate. atthe same time that fuel at high pressure is sup plied to the burner, and a throttlewhich controls the o 'eration of the engine and pum andalso t e regulatorandthe. forced dra t device.

26. In a power-system forselfpropelled vehicles, the combination of a'boiler, anrengine receiving steam therefrom which drives the vehicle, aburner for heating the boiler, a

source of liquidfi'fuel maintained under an initial pressure, .a-pump' driven by the engine to permit .t e

which receives'fu from. thesource and sup.- plies' it to theburner at a high pressure,"a connectionarranged in shunt relation to the pump, a 're ulator therein which is adapted quickly relieve eration of the to feed to the urn'er at the pressure of the source when the pump is'idle, a; forced draft er reestablished during opdevice which is adapted tofloperate atthe" same time that fuel-atjhigh pressure is sup-, plied to the' burner, a natural draft device gine pressure falls and to reduce pressure on the burner to be pump andalso to permit fuel.

which is adapted to operate at the same time that fuel at low pressure is supplied to'the burner, and a throttle which controls'the operation of the engine and pump and also the regulator and the forced draft device.

27. The combination of'a boiler, a burner therefor, an engine, a conduit between the boiler and the engine, a throttling device in the conduit, a fuel pump for supplying fuel to the burner, a regulatingdevice controlled by the live steam pressure on the engine side 4 of the throttle for increasing-the amount of fuelsupplied bythe pump when: the steam pressure on the engine increases and for decreasing it when the pressure falls, and a conduit extending from a point in the firstmentioned conduit between the throttling device and the engine for communicating said pressure-to the regulating device. I

28. In combination, an engine, a boiler which supplies motive fluid to'the engine, a

steam to the engine, a burner therefor, a

or close'said pump for sup lying fuel in excess, means for conveying fue to the burner, means for conveying the excess of fuel away from the burner, an -automatic regulator which advmits more fuel \to the last mentionedmeans.

as the activeorinitial steam pressure on the tween t e engine and regulator which permits .s'aid steam pressure to actuate the regulator.

30. In combination, an engine, a'throttlevalve therefor, a boilersupplying steam'to engine falls and decreases the excess of fuel deivered to sald conveying meansas' said *engme ressure uses, and a connection be the engine-and having a burner for heating it, a fuel pump driven by; the engine and .supplyingfuel to the burner, a source of fuel supplydor the pump and burner, areg'ulator controlling the effective delivery of the pump, arid a steam-carrying connection eX-' tend ng from a point between the engine and throttle-valve to the regulator for the regulator. l 1

3-1. The combination Jof-a boiler having a fire chamber and a burner purpose .of controlling ,the action of said device in' one ofsaid conduits controlled the active or imtial engine pressure WlllCll mthe fire cham ber, an engine receiving motive fluid from the boiler means which tends to supply. an excess of liquid fuel' to .th burner, conduitsbetween said means and} he burner, and-Y a automatically regulates the amount of fuel chamber therefor, an engine receiving steam to the engine.

from theboiler, a throttle valve for controlling the admission of steam to the engine, means for supplying liquid fuel to'the fire chamber under pressure, a regulator for automatically regulating the amount of fuel supplied to the fire chamber, and means for actuating the regulator by live steam received from the engine side of the throttle.

33. In a system of control, the combina' tion'of an-engine, a source of fuel supply, a boiler having a fire chamber, conduits between the source and the chamber, and a means in said conduits for regulating they supply of fuel to the chamber, which means isunder the controlofthe active or initial engine pressure and increases the supply as said pressure rises and decreases it as it falls.

34. In a system'jof controlfor a steamactuated apparatus, the combination of an engine, a boiler supplying steam to the'en gine, an oil pump driven by the engine, auxiliary means for giving an initial oil. pressure, a regulator for the pump, and a con nection eXtendin from a point between the main'throttle vave and the engineto the regulator for the purpose of controlling its action by-the pressure of the steam supplied 35. Thecombination ofan engine, a boiler having a burner for supplying steamto the engine, a fuelcircuit, a fuel pump actuated by the engine and capable of'supplying an excess of fuel for the burner, a valve situated in the fuel circuit and arranged to vary the amount of fuel delivered by'th'e pump to theburner, and means acted upon by the initial steam pressure of the en me for regulating the opening and closing 0 the valve.

- -36. In a system of control, the-combination of an engine,'a throttle for controlling the supply of steam to the en ine, a'pump actuated by the engine, a regu ator for controlling the effective delivery of the pump which is acted upon by the livesteam pressure on the engine side of the throttle, and a connection extending from a point between the throttle and the engine to the regulator. for communicating said pressure to the latter.

37. The combination of asteam generator, an engine, a throttle-controlling thesupply of steam thereto,'a burner in cooperativerelation to the generator, and separate means which operate one at a time for suppoying different quantities of fuel to the burner; according to the operative or inoperative position of the throttle. f

38. The combination of a steam generator, an engine receiving steamfrom the'generator, a throttle for controlling the supply of generator, means for delivering fuel to the burner for supplying a main flame during open position of the throttle, and a. means which is automatically made operative when the other means is made inoperative or vice versa for delivering fuel to the burner to supply a pilot flame during closed position of the throttle.

39. The combination of a steam generator,

crvoir, a pump connected with the reservoir and delivering fuel to the burner, means for operating the pump from the motor, 'a' throttling device controlling the supply of motive fluid to the motor, and means sensitive to the pressure on the motor side of said device for controlling the supply of fuel to the burner independently of thespeed of the motor.

41. Ina powersystem, the combination of a single source of liquid fuel supply under an initial pressure, a burner, a controllable means for creating a forced drafton the same, means for supplying fuel from said source to the burner at a definite pressure, and means dependent upon the means for crca'ting'a forced draft for permitting fuel to return from .the burner'to the'source when .the latter means ceases operating. 42. In combination, a burner, a casing therefor, a natural draft flue and a forced draft flue communicating with the casing, means for inducing a forced draft, means for supplying fuel to the burner, and a means dependent upon the means for creating a" forced draft which increases the ressure. on 'the burner at the time the forced draft begins to operate, and relieves the pressure on the burner when the forced'draft ceases and the natural draft begins to operate. w 43. In a power system for self-propelle vehicles, the, combination of a burner, a source'of liquid fuel supply maintained under an initial pressure, a pump and connections between thesource and the burnerfor supplying fuel to the latter ata high pressure, a connection arranged to convey fuel from ,the tank to the burner when-the pump is idle or from the burner to the tank when the too pressure on the latter is above that on the steam to the engine, a burner for heating the :said connection and themeans forcreatmg a forced draft so as to permit fuel to flow from the burner to the'tanksimultaneou'sly with the cessation of the'forced draft. v

44. In a power system for self-propelled vehicles, the combination of a burner, a' source of liquid fuelsupply maintained under an initial alr pressure,.a pump and connec tions between the source and the burner for supplying fuel .to the latter at a high pressure forsu porting a main flamegmeansforf creating a forced draft on the 'mam flame, a connectlon extendmg 1n shunt relation to the pump to form a by-pass around the latter, a valve therein which when open permits fuel to pass to the burner at the pressure on the source to maintain the flame in banked condition and when closed prevents the fuel delivered by the pump IIOIIl by-passin and means for providing a natural draft or the flame when in banked condition.

\ 45. In combination,. a' burner, a conduit connected therewith throughwhich fuel is supplied to the burner at a suitable pressure,

a device employing fluid under pressure for creating a forced draft on the burner, a source of fluid pressure connected with said device, and a manually-controlled means for quickly relieving the pressure onthe. fuel in said-conduit while simultaneously cutting off the supply of fluid to said forced draft device.

46. In combination, a burner, separate means. which operate reciprocally to supply fuel to the ,burner at different pressures,

means for creatinga forced draft on the* burner, and means which simultaneously interrupts-the fuel su ply of higher and stops the force draft an .at t e same time opens the fuel supply. of lower pressure..

47 In combination, aburner,-- separate means which operate reciprocally to supply.

fuel to the burner at.different 'ressures,

means for creating a forced dra t on the burner, and meanswhich operates 'to stop the forced. draft: and to-simultaneously in. terrupt one fuel supply. and open the other thereby permitting the pressure on. the

burnerto be relieved at the time the forced draft ceases operating. 5 v

48. In combmatlon, a burner, a casln therefor, a natural draft flue and a force draft flue communicating with'the interior of the casing,.means for inducing a forced draft,

means for supplying fuel to the burner, and a manually controlled means whichfsimultaneouslyregulates the forced draft and'the fuel su ply. 1 49. n combination, a burner,-- a .casin therefor, a natural draft flue and aforce draft flue'communicating with the interior of .the casing, means for inducing'a forced draft, means for supplying fuel to the burner at high pressure, means for supplying fuel at a lower pressure, and means comprising coop.-

1 v erati ng devices which simultaneously renders operative" the means f0 inducing a'forced draft and the means for u lying fuel to the burner at high ressure Wlill e rendering the;

means for supp ying fuel at lower pressure "inoperative, or vice versa.

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