US1064763A - Regulator for tapped turbines. - Google Patents

Description

W. PAPE.

REGULATOR FOR TAPPED TURBINES.

APPLIGATION FILED JAN.21, 1913 1,964,763. Patented June 17, 1913.

2 SHEETS-SHEET 1.

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W. PAPE.

REGULATOR FOR TAPPED TUBBINES.

APPLIOATION FILED mum, 191s l,06,?63, Patented June 17, 1913 2 SHEETS-SHEET 2.

Witnesses: lnventcrg I I Wilhelm apa, ZZZ W I TINTTED %TATE% hair-nua" env ron.

WILHELM PAPE. OF GHARLOTTENBURG, GERMANY, ASSIGNOR, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEVI' YORK.

REGULATOR FOR TAPPED TURBINES.

memos.

Specification of Letters Patent.

Patented June 1'7, 1 913.

Application filed. January 21, 1913. Serial No. 743,336.

To all whom it may concern:

Be it. known that I, VVILHELM. Pare, a subject of the King of Prussia, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Regulators for Tapped Turbines, of which the following is a specification.

This invention relates to elastic-fluid turbines, and especially to those in which provision made for extracting a portion of the-steam for industrial purposes, after it has passed through the higher stages of the machine. In such turbines, the high pressure inletvalve is usually controlled by a speed governor, while the overflow valve, which admits the surplus steam from the extraction chamber to the low pressure stages of the machine, is controlled by a pressure responsive device, exposed to the pressure in said chamber. In the practical operation of such a system, certain detects become apparent. If the load varies, the number of revolutions per minute will vary inversely with the load. An increase of load will cause a wider opening of the admission valve by the speed governor, and the pressure in the extraction chamli er, or tapped stage, rises in accordance with the greater quantity of steam delivered thereto. The rise of pressure causes the pressureres ')onsive device to open the overflow valve. This brings into play the low pressure bucket wheels to'carry the increased load, so that the speed comes up againfand. the speed governor reduces the opening of the admission valve. This again causes another tum tioning of the pressure device controlling the ovcl'llow-vulve, tending to close said valve more or less. Thus it appears that the two regulating devices can swing into a state oi' rest only gradually, producing a species of hunting as the speed rises and falls. Thev etlect is quite similar in case the steam con sumption varies in the industrial system supplied by the eXtraction pipe. it more steam is consumed, then the prcssm'e-responsive device closes the overflow valve by a corresponding amount. This tends to lessen the work done by the turbine. so that the spew-l. governor mustopen the high pres ure admission valve enough to rcestanusl'i the former amount of work-poi'jtiormance and enable the turbine to carry its load. Each of the two regulating devices thus influences the other, but not instantly, so that between the operations of the two quite a long oscillation easily occurs, before a condition of equilibrium is finally attained.

The present invention is designed to obviate this ditliculty. The speed governor is arranged to act upon both'valves in such a manner that the pressure in the extraction chamber remains constant. If therefore the load varies, the speed governor regulates the steam supplv without in any way affecting the pressure in the tapped stage. The pressure-responsive device is so arranged that itopens or closes the overflow valve or the high pressure admission valve according to the steam consumption, while at the same time it influences the speed governor rods in such a manner that the load on the machine and thus also the number of revolutions per minute of the turbine will remain constant.

in the accompanying drawings, Figure 1 is adiagram of mechanism embodying my invention, the movements of the two regulators being communicated directly tothe two valves; Fig. 2 represents a system in which indirect oil transmission is employed; and Fig. 2-3 shows a tapped turbine controlled by valve mechanism of the previous figures.

Referring first to Fig. 1, the high pressure admission valve 1. is connected to a lever 2 tu'lcrumed at 3 and articulated by a pivoted block 4 to one end of a lever 5, fulcrumed at 6 and connected by a link 7 to a floating lever 8, to which is connected the stem oi? the overflow valve 9. The lever S is also pivoted to the rod 10 of a piston 11 working in a cylinder 12, and biased in one direction by a spring 13 which acts in oppo sition to the fluid pressure of the steam in the extraction (.llflllllJPI. of the turbine, couvcyed to said cylinder by the pipe 14:. This device forms the pressure regulator for controlling the overflow valve 9. The speed governor 15 has a movable collar 16 which is pivoted to a second floating lever 17, connected at; an intermediate point to a link 13 which is pivoted to the block 4-. The other end of the lever 17 is pivotally connected to a lever 15) which is l'ulcrumed to a support 20 capable of longitudinal adjustment along said lever. Al 21 the lever 19 is pivoted to The opthe rod it) of the overflow valve. oration of these parts is as follows: If the load on the machine increases, the speed governor collar 16 drops and pulls down on the link 18, which operatesthelevers 2 and pressure-responsive device,

5. and opens both the valves 1 and 9; the adjacent ends of the levers 8 and 17 being held stationary by their connections to the rod 10 of the pressure-responsive device, The surplus steam admitted by the valve 1 is therefore passed on to the low pressure stages of the turbine to assist in carr ing the increased load, without changing t e pressure in the tapped stage, or extraction chamber. As the same eflect is produced with a falling load, it appears that suitable regulation by the speed governor will be accomplished without in any way affecting the It, now, the consumption of steam in the industrial system varies, assume, for example, that it increases, with a corresponding drop in the pressure in the extraction chamber. In accordance with this decrease in pressure, the piston 11 is forced down by the spring 13 and actuates the'fioating lever 8 to close the overflow valve, said lever tending to fulcrum on thestationary link 7 But at the same time, the levers 19,17, 5 and 2 are chan ed in their positions, and insuch manner t at the two valves are opened. The object 'of this simultaneous opening is to increase the fiowcf steam through both thehigh and the low pressure; stages of the turbine without aflect/ing the pressure in the extraction chamber, in order to make up for the decrease in the work performed in the low pressure part of the turbine by the closing of the overflow valve, and thus to maintain constant the total amount of work performed by the turbine notwithstanding the greater consumption of steam in theindustrial system; It thus appears that with varying steam consumption in the industrial system, the pressure-responsive device maintains constant the sum of the production of energy in the high and low pressure por tions of the turbine, irrespective of the speed governor, and at the same time keeps a constant pressure in the tapped stage. Under the most unfavorable conditions, the speed governor has only to equalize small inaccuracies of operation. By shifting the adjustable fulcrum 2-0 the ratio ofthe leverages acted upon by the pressure-responsive device may be varied, so that the influence upon the work performed, exerted by the shifting of the valve stems may be exactly adapted to the variation in work caused by the movement of the overflow-valve.

' In Fig. 2, the movements of the two valves are effected by means of'hydraulicmotors 22, controlled by pilot valves 23 which are acted on by the two regulating devices -in a manner which will be readily understood by a comparison with Fig. 1.

In accordance with the proyisions of the patent statutes, I have dese tied the prin ciple of operation of my in ntion, together with the apparatus which-.Ijiiow consider to represent the best embddiment thereof but I desire to have it understood that, the apparatus shown is only illustrative, and that the inventioncan be carriedout by other means.

What I claim as new and desire, to secure load on the turbine may remain constant, and with a varying load thesteam supplled from the tapped stage remains practically constant.

'2. In a tapped turbine, the combination with a high pressure admission valve and an overflow valve between the tapped stage and the low pressure portion of the turbine,

of two articulated levers, one of which is connected to the high pressure admissionvalve, a floating lever connected to the overflow valve and linked to the other of the articulated levers, a pressure-responsive device connected to said floating lever, an adjustable lever pivoted to the rod of the pressure-responsive device, a speed governor, a second floating lever actuated by. the speed governor and pivoted to said adjustable lever, and connections between said second floating lever and the joint between the articulated levers.

In witness whereof, I have hereunto set my hand this thirty-first day of December, 1912.

WILHELM PAPE.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

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