US1063550A - Regulating turbines. - Google Patents

Description

Patented June 3, 1913,.

W. KIESER.

REGULATING- TURBINBS- APPLICATION TILED 001a, 1912.

'IIIIIIIII/mV 'll Inventor Walter Kleser', by 1% His Attorney.

UNTTED STATES PATENT OFFICE.

WALTER KIESER, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

REGULATIN G TURBINES.

Specification of Letters Patent.

Application filed October 5, 1912.

To all whom it may concern Be it known that I, WALTER Krnsnn, a citizen of the Swiss Republic, residing at Charlottenburg, Germany, have invented new and useful Improvements in Regulating Turbines, of which the following is a speclfication.

This invention relates to elastic fluid tur-- bines, and especially to those which are driven normally by low pressure or exhaust steam, but are provided with means for supplying live or high pressure steam when the exhaust steam is unable to carry the load.

The object of the invention is to provide a regulating device which depends upon fluctuations in the pressure or quantity of the exhaust steam to maintain a substan tially uniform. speed of the turbine under varying conditions of steam supply.

111 the accompanying drawing, Figure 1 represents diagrammatically a simple embodiment of my invention. Figs. 2 and 3 are diagrammatic illustrations of more elaborate systems involving the same inventive idea, and Fig. 1 is a conventional representation of a mixed pressure turbine.

Taking up first Fig. 1, the high pressure or live steam is controlled by the throttle valve 1, and the low pressure or exhaust steam by the throttle valve 2. The stem of the valve 1 is pivoted to one end of a float-- ing lever 8 fulcrumed at at on one end of a lever 5 whose other end is controlled by a speed-responsive device 6 driven directly or indirectly by the turbine to be regulated. The other end of the lever 3 is pivoted to the stem 7 which terminates in a cylinder 8 containing a piston 9 whose rod 10 is connected to the exhaust valve 2. A spring 11 in the upper part of the cylinder 8 exerts downward pressure on the piston 9, whose underside is exposed to the pressure of the exhaust steam, conveyed to the cylinder through the pipe 12. Connected with the rod 10, preferably by means of the. rigid arm 13, is a spring 14, which is also attached to one end of a lever 15, whose other end is pivotally connected with the stem of the throttle valve 1. The speed governor 6 controls both throttle valves, the live steam valve 1 being normally closed. hen the speed of the turbine increases abnormally, the sleeve 16 of the governor rises and the floating lever 3 is depressed. The valve 1 being closed, the lever pivots at the point 17 Patented June 3, 1913. Serial No. 724,032.

and the composite stem 7, 10 of the low pressure valve is pushed down, stretching the spring 14 and throttling the exhauststeam to check the excessive speed. Conversely, when the speed falls below normal, the floating lever is lifted, opening the low pressure or exhaust throttle valve 2 until it is practically wide open, when the live or high pressure steam valve 1 also begins to open to supplement any lack in the supply of low pressure steam. All this time the pressure of the exhaust steam is assumed to be constant. Now, if the pressure of the exhaust steam falls, then the spring 11 is relieved, and the piston 9 is forced down, thereby increasing the effective length of the valve stem 7, 10 and partly or wholly closing the exhaust throttle 2. By the downward movement of the rod 10, however, the spring 14 is put under a greater tension, and tends to open the live steam throttle 1, whereby, through the oscillation of the lever 3 about the pivotal point 18, the sleeve 16 of the speed governor is depressed. By this means the number of revolutions of the turbine is maintained at normal, in spite of the admission of live steam. In other words this arrangement avoids a change in speed of the turbine in passing from low pressure to mixed pressure operation and vice versa.

In Fig. 2 are shown the same live steam and exhaust steam valves 1, 2, but the former is actuated by a hydraulic motor 19, whose pilot valve 20 is controlled by the speed governor 6 and lever 21, and whose secondary regulator 22 operates also a lever 23 which is connected to the stem 241-, 25 of the valve 2. The exhaust pressure acts in the device 26 to control the oil supply to the space between the two abutments 27, 28 in the cylinder 29 connected respectively to the two portions 21, 25 of the stem. To the lower portion 25 is attached a rod 30 which is pivoted to a lever 31, fulcrumed at 32 and hearing at its other end on a spring 33, which exerts a downward pressure on the lever 21, the pilot valve 20 and the sleeve 16 of the speed governor 6. The spring pressure is thus varied in accordance with the pressure of the exhaust steam and the variation in the effective length of the stem 24, 25, and this variation is communicated to the governing devices, so that here also as in Fig. 1, no variation of the number of revolutions of the turbine will occur in changing from operatingby exhaust steam to operating by live steam. The oil pressure in thecylinder 29 may alsobe utilized-to vary the tension of the compensating spring instead of the rod 30 and lever 31. This is accomplished by running a pipe 3et'from between the abutments 27, 28 to a cylinder 35 in which works a piston connected to said spring 38.

The construct-ion shown in Fig. 8 embodies a further modification of the basic idea above set forth, showingthe devices of iF gs. 1 and 2 combined with mechamsm which forms the subject matter ofmy pendapplication filed February 7, 1912, Se-

rial No. 676,052. In view of the-explanationsgiven in this application .and theaforesaid;pending applicatioinit is not thought necessary to enter into a detailed description of this figure.

In .accordance with the provisions of the patent statutes, Ihave described the principle o'f-operation of my inventiomtoget-her with the apparatus which I now consider to represent the best embodiment thereof, but

I: desire to-have it understood that the apvpensating effect upon the speed governor,

whereby the number of revolutions of the turbine Wlll remain constant.

2. I11 a turbine, the combination with the live steam valvemechanism and the exhaust steam throttle valve, of a speed governor controlling both, a stem tor the exhaust valve composed of separate parts, means whereby fluctuations of the exhaust steam pressure can vary the efi'ective length of said stem, and means whereby said variation can exert a compensating effect. upon the speed governor.

3. .In a turbine, the combination with'the valves for liveand exhaust steam, ot a stem forthe exhaust valve composed of two separable parts, means whereby fluctuations of. the exhaust steam can vary the distance between said parts, a lever connected to that part of said stem which carries the valve, and operative connections whereby said lever can exerta compensating eltect upon the speed governor.

.In witness whereof, I have hereunto set my hand.

VAL ER KIIQSER.

IVitnesses CARL Rrrrnn, .LUDWlG CUBnLio.

vGopiesaoi this patent may be obtained for=five cents wach, by addressing the Commissioner of Patents. .Washington,:]). 0.

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