US1408049A - Governing means for marine turbines - Google Patents

Description

c. R. wALLER;

GOVERNING MEANS FOR MARINE TURBINES.

FILED SEPT-4.1919.

APPLICATION Patented Feb. 28, 1922."

2 SHEETS-SHEET l.

C. R. WALLER.

GOVERNING MEANS FOR MARINE TURBINES- APPLICATION FILED SEPT-4, 1919.

1,408,049, Patented Feb. 2g,. 2

2 SHEETS-SHEET 2.

4. [III/III" I I liil! JIM/WE).

UNITED STATES PATENT OFFICE.

CARL R. WALLER, OF TREN'ION, NEW JERSEY,-ASSIGNOR TO DE LAVAL STEAM TURBINE. COMPANY, OF TRENTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

' GOVERNING MEANS FOR MARINE TURBINES. a

Patented Feb. 28, 1 922.

Applicationfiled September 4, 1919. Serial No. 321,721.

To all whom it may concern:

Be it known that I, CARL R. vvALLER, acitizen of the United States, residing at Trenton, county of Mercer and State of New Jersey, have invented a new and useful Improvement in Governing Means for Marine Turbines, of which the following is a full,

important when the vessel .is operating in a high sea, which may'cause the propeller'to eave the water, thus. suddenly changing the 1 load on the drivingjturbine.

Itis also essential that this governing arrangement shall be installed in such "a man her that any steam that is used for driving the'propelling turbine must go through the governor-controlled valve. Vlqiere' compound turbines are used, several auxiliary pipes are provided, inorder' to make it possible to operate one ofthe turbines, should the other onefor some reason fail. In such cases,xit is desirable that any steam used for drivin any one of. the turbinesshall go througi this governor valve, and that in case of any increase of speed of either turbine shaft, the valve shall be actuated.

In connection with geared turbines, it is of the utmost importance that the oiling system should always be in commission, and 1t 1s therefore desirable to have some arrangement that w'ill shut down the turbine in case the oiling system should fail.

My invention has for its object to control in the event of abnormal speed of th'e'turbin'e or upon failure of the oil supply. The vention comprises a steam supply valve arranged to be opened by a predetermined pressure of 0 1l,such pressure being reducible below said predetermined amount by means for restricting theiflow of oil operable bythe overnor in case of excess turbine speed. y thisarrangement, whether the pressure of oil be reduced by its own failure or by a restricted flow due to'excessive speed ftheturbin he upp y, of s m to he the ves turbine will be out off until the abnormal 2 condition is removed.

Fig. 1 is a plan view of a compound turbine, showing the manner of applicationof my invention. Fig. 2 is an elevation of the same. V

I Fig. 3 is a vertical sectional view of a preferred embodiment of my invention combined with a governor of known type.

No details of the invention, except, certain pipe connections, are shown in'Figstl and 2,

which represent a conventional illustration of a compoundturbine. The admission of steam tothe high pressure turbine (land to the low 'pressure turbine b is controlled the main governor-controlled valve 0 in. the

valve casing 0,1the inlet for steam being through the pipe at.

. Both the high pressure turbine andthe low pressure turbine are, of course, normally operated, but if, for any reason, it becomes desirable or necessary to cut out the high pressure. machine, the low pressure machine can be run independently by closing the manoe'uvering, valve e and v openingthe valves '7 and g, which admit steam respectively to the ahead and astern portions of the low pressure machine.

It will belobserved that, whether one or both turbines are in operation, the a dmis sion of steam regulated by the governorc'ontrolled valve'o,

. Both turbine shafts are' equipped with 'governorsh, each 'of which controls an oil admlsslon pllot valve i connected, through an oil pipe j with a piston controlling the main'valve, as hereinafter described.

One of the governors h is. shown in Fig. 3. The turbine shaft is is geared to an upright shaft at having a housing n within which are centrifugally operable weights 0 held in neutral position by springs 39. the governor valve so that it will close either I When the governor revolves at sufiicient speed to throw out the weights, they,

but my invention contemplates the employment of any workable governor.

The main valve casing o'has the steam, 1 inlet 0?, and one or more steam outlets, The

number of outlets willof course depend upon the particular arrangement on board I sel, two "being shown in the present disclosure.

The valve casing c is bolted to a'support- 111gfranre 15.

down through a stufiinq bog; w into a cylinder formed by the lower part of the supporting frame It.

cylinder '0. Threaded on. the valve spindle u is an adjusting nut g bet'ivee'n which and a fixed part of the frame If, and coiled about the spindle; is a spring p The valve '0, unless actuated by sufiicient pressure of oil against? piston 13, as he1'ein-after described, is held'closed, as showirin Fig. 3, by the tension of spring 2. a Y

The governor-actuated sleeve 8 has pins 10, which engage" the forked end of an intermediately fulcriune'd lever 11, Whose other end 'is'attached to the st'em of the' pilot valve 2', liereinbefore ,InentiOne'dQ p Oil from; the main coiling system is admitted to the pilot valve casing at 12; p The oiloutflo'yv's from the pilot valve casing if for any re to overconief the tension of the spring 2. Let it be assuin d tli ffi the normal pressure in the main oiling systemi'smaintained at about ten poundsand' that it" isdesirable to shut 01f steam froin the turbine in case the oil pressure should drp to fivepoints or below. It is clear that to start the turbine the oilings'ysten'i must first be put into service. Specifically, oil is admitted to the I pilot velvet and floiv's theretliroujgh unrestric'tedl'y, passing through pipej into cylinder a It is also necessarvto create a pressure on th e oiling system-lot abm efive pounds beforepiston13 lifts and opens valve 0. Inotlier Words; stearn cannot be adniitted through the valve 0 unless the r ssu e in the oiling systernis above five Shoultljtlie turbine'uiiit 111; Service and I asofi the oiling systenrsliould ila h re F v, up t d p of il iii sure to five pounds, vvould immediately start to close. Q] a a case, diiring service, the turbine speed eii'cieedsnor'rnalg thi governor It will actuate .mdj fj the oil" rssag' as an I v M cause a drop 11,1 oil pressure to fiv peafids,

The steam-admission valve 1; 1s in'oi'lnt'e'd ona spindle a, which efitends On the lower end'otl the x 'alx c' spindle a is apiston 13 within the COPY or less, whereupon the valve 0) will close. As'soonas the turbine speed reduced to normal, the pilot valve will be operated to allow free flow ofoil and ca'us'ethe" oil pressure to Inount above five pounds and thus actuate the piston 13 to open the valve 1;.

Having now fully described my invention, \vhatI claim and desire to protect by Lettars Patent 1. In a governing rneans for stearn turbines, the cornb i nationivith a turbine unit, of a governor o'p erablethereby, a steam admission valve, a lubricatingioil circulating system for the turbine unit,. including a contantly open throttl ing passage causing a predetermined rate of'flow froin onepart of thesysteln to anothjeigmeans controlled by the governor tovary the rate offlow tothe first mentioned, part oi" sai d s y'stenl, thereby varying the pressure of oil] at one side of said throttlingpassage, anda Inovable element connected with and controlling the opening; and closinglf of the I ste'aInI valve and contain nits o e'mti n b 1 said var ation in pressure of oil at one si sari-11 throtfling s a a 1; 2. na governing" means'fo'r ste'zinr turbine's; the combination. withfa turbine unit,

of a governor operable a Steam mission valve, a. lubricatingvoil circulating system for the turbine unit, fa; 61astantly' open throttlingjpa'ssage a predetermined rateoffloiv frorn one art of the'system to mothers-means contr'o l'edbythe governor toiv'a'ry the'rate of flovv to the first 1nentugned partof said system, thereby varying the pressure of" oil atone side? of said throttling "passage; .a cylinder continunic'ating with the part of thes'ystem Which the rate of oil variedias specified, and api teninsaiacyimder connected with and controlling "the operation f fi Steain valve.

3. In a governing'nieans far-"steam turbihe's the combination with a' tlirbine unit,

of a governor operable thereby. a stem; ad-

niission valve, a lubricatingbil circulating for the, turbine unit, including" a constantly openthrottling passage causing a eaterminea rate of new from onepait of.

tli'e sys'teni to another, means controlled by the governor tovary the rate offl'oivto' the first mentioned part of'said systein, thereby varying the pressure of'o'il at one side ofsaid throttling passage, a cylindervoo nnhunicating \vlth the system between the throttl ng passage anduie governor @o'ntmueai means,

and afpisto'nl in saidfcylinder conneaed" to theiste'ani valve for actuatin'gfsaid valve;

41 In'Ka guv'eming mfean's forsteam turtimes, are combination with al' amiss-"aria;

of 1 overns: operable thereby, a steam admission valve; a lubricating? oil circulating 'Y' fi ie the" i l i i i i l l reat-amass raiser aae' psre 6m the system to another, means controlled by the governor to vary the rate of flow to the first mentioned part of said system, thereby varying the pressure of oil at one side of said throttling passage, a cylinder interposed in said system, a piston in said cylinder, said throttling passage connecting the ends of the cylinder on opposite sides of said piston, whereby the piston is subjected to said variable pressure of theoil, and means connecting the piston and steam valve whereby the opening and closing of the latter is controlled by said piston.

5. The combination ofasteam turbine and a pressure lubricating system therefor, a valve for controlling the admission of steam to said turbine, a valve actuating device wholly under the control of the pressure in the lubricatings steni,n1eans for permitting a constant flow 0 oil through the lubricating system at a predetermined rate to build up pressure to actuate said valve, a governor actuated by the turbine, and a valve controlled by the governor for varying the feed of oil to the system to vary the pressure.

0'. In a governing means 101' steam turbines, the combination with a turbine unit, of a steam admission valve, a lubricating oil circulating system for the turbine unit, including a constantly open passage causing a predetermined rate of flow from one part of the system to another, and a movable element connected with and controlling the opening and closing of the steam valve and controlled in its operation by said variation in pressure of oil at one side of the throttling passage, whereby failure to maintain an adequate flow of oil through the system at the last named side of the throttling passage will cause the steam valve to be moved toward its closed position.

In testimony of which invention, I have hereunto set my hand, at Trenton, N. J on this 22nd day of August, 1919.

CARL R. WALLER.

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