US1150250A - Steam prime mover for marine propulsion. - Google Patents

Description

Witnesses .4

Q?. QU

Patented Aug. 17, 1915.

inventors Attneys.

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, STEAM .PRIME MOVERFOR MARINEPROVPULSIO.

Specification of Letters Patent.

Patenten aug. 1t, 1e15..

Application led January 20, 1912.- Serial No. 672,455.

`ToaZZ 'whomt't may concern:

A Be it known that we, CHARLES G.'CUn'r1.'s, a citizen of the United States, .res1ding 1n the borough of Manhattan, city, county, and

VState of New York, and RALPH L. LovELL, a

rtsiding at.

4citizen of the United States, Quincy, in the county of Norfolk and vSta-te of Massachusetts, have invented anew and l useful Improvement-in Steam Prime Movers for Marine Propulsion, of which the follow- 1n is a specification. Y

nhe ob]ect we have,` in view is to provide a steam prime mover for marine propulsion, in which the from steam turbines, which improved prime mover 1.will give a high .effic1ency at low .power and speed.

In carrying' out our invention, we provide each propeller shaft of a twin screw installa-- tion with a steamturbine adapted to utilize thev full expansion of the steam. These steam turbines are preferably of the type having 'initial impulse 'wheel stages, and under full power conditions, the steam passes through the turbines in parallel, and independently of each other. For lower power and speed, under whichv conditions the steam for efficient utilizapower turbines, there is pro- `one of the propeller shafts a flow would be too small tion in the full vided upon highpressure cruising steam prime'mover,

which is preferably a. compound reciprocatingengine adapted to vbe coupled with, the shaft by a suitable clutch, such engine being adapted to operate eiicientlycn the upper part of Athe steam expansion range iowrequired'for cruising conditions. vThe high pressure cruising prime mover, instead ofv being a reciprocating engine; may be a steam turbine connected by a clutch with the shaft, or permanently connected therewith, and having the necessaryizsmall steam portion of the steam expansion range .with thesmall volume of steam required for cruise ing.l A steam connection ismade fromfthe exhaust of the high pressure cruising prime mover to the full power steam turbine on v the other propeller shaftfso that under cruising conditions, the steam How vwill -pass through' the high pressure cruis' g p e mover into the turbine on the other ,shaft,

principal powerA is derived?- same purpose,

with the reduced Y' steam l Y ffinnozzles on one of passageways to eiciently utilize the upper `when the steam flows in which the lower 'part of the steam expanvided for varying the intermediate pressure so as to sec-ure thisresult. The exhaust from the cruising'prime mover,.\before it reaches the turbine on the othershaft, is connected with 'a manifold, from which a series of connections are made to different stages ofthe turbine. by valves, so thatrthe steam may be exhausted from the cruising prime mover 'into the turbine at diii'erent stages. As a further means for securing the proper distribution of pressure, the connection of the manifold to the first stage of the turbine is made with a. series of nozzle sections controlled by valves, so that the Inozzle area may be adjusted. As a still further provision for the a valve controlled by-pass is provided around the second cylinder of the compound steam-engine, or around some of the lower stages of the cruising turbine, thel opening of which will still Y of a twin-screw arrangement.

` ln the accompanying drawing, Figure l is a plan view in outline showing the two propeller shafts with their prime movers connected therewith; plan of a-cruising steam. turbine whichmay -be used in place of the cruising steam eng1ne; and F ig. 3 is a. sectional view showing the means for varying the area of the cruisthe main turbines.

he main turbines 1, 2 are mounted on thepropeller s` afts 3, 4. They' have direct steam. connections 5, 6 from the boiler, and exhaust at 7', 8. These steam turbines" are adapted each to utilize'the full expansion of the steam, under high power conditions,

through them in parallel. Coupled to the shaft 3 by a clutch 9,' is .a compound reciprocating engine 10,

which is a small lpower cruising engine.

These lconnections are controlled Fig. 2 is an ,outline ft arrangement, the two shafts on each/` pressure cylinder of the engine 1l).

service.

turbine 19 (Fig. 2) may may be provided with a valve-controlled by- 60 propulsion,

Boiler steam is supplied to this engine through the pipe 11, and the exhaust therefrom is carried by a. pipe 12 to a manifold 13, from which a number of connections 14 are made with the head of the turbine Zand with the casing of that turbine at different stages. The connections 14 are provided with controlling valves 15. The connection from the manifold 123 to the head of the tui'- bine 2 is iliade with a cruising nozzle 1G (Fig. 3). different sections of which are adapted to be closed oli' from the-steam flow by means of valves li'. valve-controlled by-pass 18 is also provided around the low By these several means, the intermediate pressure or that in the pipe 12 can be varied under the different conditions of power and speed, so as to distribute the energy with substantial equality between the cruising engine and the turbine. Under cruising conditions. the engine will be coupled with the shaft 3. and the steam will flow through the engine to the. turbine 2, the turbine 1 being out of Under high power conditions, the .engine will be uni-,oupled from the shaft, and the steam will be passed through the two main turbines in parallel. Instead of a cruising engine on the shaft 3, a cruising be employed. This pass 20 around some of its lower stages, which bypass will be utilized to control the pressure distribution.

lVhat we claim is:-

1. In a ste-am prime mover for marine propulsion, the combination of two full power steam turbines on separate shafts, a

high pressure cruising steam prime mover anon one shaft,

means for passing steam directly to the full power turbines in parallel for high power and means for passlng the steam in succession through the cruising prime mover on one shaft and the full power Alt-urbino on the other shaft for lower powers,

substantially as set forth.

2. In a steam prime mover for marine propulsion, the combination of two full power turbines on separate shafts, a high iiO pressure cruising reciprocating engine removably connected'with one shaft, means for passing steam directly to the full power turbines in parallel for high power .and

means for passing the steam in succession i .through the reciprocating engine on one shaft and the fulbpower turbine on the other shaft for lower powers, substantially as set forth. l

3. In a steam prime mover for marine the combination of two full power steam turbines on separate shafts, a high pressure cruising steam prime mover on one shaft, means for passing steam di- 'reetly to the full power turbines in parallel for high power, means for passing the steam substantially as set forth.

4. In a steam prime mover for marine propulsion, the combination of two full power steam turbines on separate shafts, a high pressure cruising steam prime mover on one shaft, means for passing steam direetl y to the full power turbines in parallel for high power, means for passing the steam in succession through the cruising prime mover on one shaft and theturbine on the other shaft for lower powers, the exhaust connections from the cruising prime mover to the turbine being made to different stages of the turbine, substantially as'setforth.

5. In a steam primev mover for marine propulsion, the combination of two full power steam turbines on separate shafts, a high pressure cruising steam prime mover on one shaft, means for directly to the full power turbines in parallel for high power, means forpassing the steam in succession through the cruising prime mover on one shaft and the turbine on vthe other shaft for lower powers and an adjustable cruising nozzle on the turbine, substantially as set forth.

V(. In a steam prilne mover for marine propulsion, the combination of two full power steam turbines on separate shafts, a high pressure cruising steam prime mover on one shaft, means for passing the steam directly to the full power turbines in parallel for'high power, means for passing the steam in, succession through the cruising prime mover on one shaft and the turbine on the other shaft for lower powers and a bypass around the low pressure section of the cruising prime mover, substantially as set forth.

7. In a steam prime mover for marine propulsion, the combination with two shafts, of a high pressure steam prime mover on one shaft, and a' steam turbine on the other shaft, a passage connecting the said two motor elements in succession, and controlling mechanism for controlling and varying the whereby an connections passing the steam prime mover to the turbine being made to different stages ofthe turbine, substantially as set forth. 9. In a steam prime mover for marine propulsion, the combination with two shafts. of a high pressure 'steam prime mover 0n one shaft, and l shaft, means for passing the steam in succession through the high pressure steam prime mover kand the turbine, and an adjustable cruising nozzle on the turbine, substantially asset forth.

10. In a steam prime mover for marine propulsion, the combination with two shafts, of a compound high pressure steam prime mover on one shaft, and a steam turbine on the othershaft, means ,for passing the steam.`

by-pass around the l the high pressure steam ystantially as set forth.

a steam turbine on the other in succession through the high pressure steam prime mover and the turbine, and a low pressure section of 20 prime mover,- sub- This specification signed and witnessed this 16th day of anual-v 1912.

-1 CHARLES G. CURTIS.

' RALPH L. LOVELL. [L.s. fitnesses to thesignature of Charles G. Curtis: s

JOHN L. LoTsCH,

Guo. J. HANsoN. lVitnesses to the signature of Ralph L. Lovell:

SAMUEL T. MACQUARRIE, [L.s.] LUCY C. HOLLIS. L. s]

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