US1794747A - Regulating mechanism for steam or gas turbines - Google Patents

Description

March 3,1931.

0. A. WIBERG 1,794,747

REGULA'IING MECHANISM FOR STEAM OR GAS TURBINES Filed Sept. 18, 1925 2 Sheets-Sheet l March-3, 1931. o. A. WIBERG 1,794,747

REGULATING MECHANISM FOR STEAM 0R GAS TURBINES 2 sheets-sheet 2 7 Filed Sept. 18, 1925 kin/m2 it Fatented 'Mar. 3, 193T UNITED; STATES T N QFFICEQs OSCAR ANTON wrnnne, or rrnsr'oive, SWEDEN REGULATING MECHANISM FOR STEAM on GAs remnantsv Application filed September 1a, 1925, SeriaLNo. 57,255, and in Sweden September 18, 1924. it i The present invention relates to regulat ing mechanism for elastic fluid turbines, as

Vided with a regulating mechanism accordin to this invention.

Fig. 2 1s a cross SQClilOlLOIl the line AA of Fig. 1 and elevation of the governor mechanism associated therewith. 7

With reference to the drawing it is to be noted that Fig. 1 shows a quarter of the turbine only. For the sake of the description it should be kept in mind that the turbine is symmetrical with respect to the vertical and horizontal dotted lines shown in this figure.

With reference to Fig. 1, the numerals 9, 8, 7 denote successive sections of the rotary blade system of a radial fiow turbine, having oppositely rotatingrotors, and 15 is one of the turbine shafts. 11 indicates the stationary turbine casing, and 12, 13 are the members of a labyrinth packing disposed between the blade system and the stationary casing. Said members are also for the purpose of balancing the axial thrust due to the pressure of the driving medium upon the rotary system.

, Situated at the outer side of the packing member 13 at each side of the turbine is an annular regulating slide valve 2 which is con tained in the supply chamber for the driving medium 1. Said slide valve is rotatable relatively to the axis of the turbine. Formed in the slide valve 2 are a number of concentric 5 sets of apertures 3, 4 by means of which the supply of driving fluid to passages 5, 6'lead ing through the packing members 12, 13 to various points of the blade system may be controlled.

In Fig. 2, I have shown the annular valve 2 'dium only through passages 5 and at lO connectedto the governor of the turbine to secureran automatic operation of the valve in ,responseto the load' 'The. rotary valve 2 is connected by the link 20 to oneend of a lever 21 pivoted at 22 and the opposite end of which is connected by the link, 23 tothestern 24.01

the centrifugal go'vernor25.

The operation'is as follows' c Between the chamber land the inlet point 10 of the blade system there is an always open connection throughwhich the driving- The driving medium (as over load steam) expands through the blade system sections 7 8 and 7-, whe'reas the driving medium enter- 2 ing at 10 expands through all sections 9, 8,

and *7. -When connection is made between chamber 1 and the passages 6 driving medium will enter through 6 to expand in the section 7 only.

When the load. decreases the entrance through 6 is first cut ofi? so that driving me- 0 enters. "Upon further, reduction of the load also the entrance through passages 5 will be cut off so that driving medium enters at the point 10 only. f CF At normal load andv normal speed the posi tion of the valve is as shown in Fig.2. As the speed of the turbine decreases the governor weights 25 are drawn together by their springs. The bell crank levers are thus correspondingly moved so that the rod 2.4and the link 23 will be moved upwardly, turning the lever 21 on the pivot 22 and moving the rod 20 downwards. The valve is thus turned in the direction of the arrow so that the openv ings 3 are allowed to pass driving medium to the passages 5. If more driving medium is required the movement will continue until the openings 4: will coincide with the passages 6.-

At reduced load the operations take place in the reversed order.

The apertures 3, 4: of the regulating slide 7 valve 2 are so arranged relatively to the passages 5, 6 that in the movement of the slide valve, from its normal position, in which the passages 5 and 6 are covered, in the direction of the arrow, Fig. 2 the passages 5 Will first be uncovered and then the passages 6.

It is to be noted that more than two series ot'r'supply passagesanay be provided. Accordingly, the slide valve 2 must be formed with a corresponding number of sets: of apertures.

I claim V :1. In an elastic fiuid turbine the combination with a radial flow blade system, a stationary casing and a labyrinth packing between said blade system and said casing,of single fluid admission chamber located axially ,outside said packing, concentric series of fluid inlet passages leading from said chamber to J intermediate stages of the blade system through said packing, an annular disk rotatably mounted in said chamber in engagement with said packing, said disk ll: aving an always open connection atits inner circumference to the inlet pointof the blade system, and concentric series of apertures formed in the disk to cooperate with said passages to control the successive admission of additional steam directly to saidintermediate stages of the blade system. f

2. In an elastic fluid turbine the combination With a radial flow blade system, a stationary casing and a: labyrinth packing between said blade system and said casing, of a single annular fluid admission chamber located axially outside said packing,concen-- tric series of fluid inlet passages leading from said chamber to intermediate stages of the blade system through said packing, an annular disk rot-atably mounted in said chamber in engagement with said packing, said disk leaving an always open connection at its inner circumference to the inlet point of the blade system, concentric series of apertures formed in the disk to cooperate with said passages, a governor, and connections between said governor and said annular disk to rotate the latter in order thereby to control the successive admission of additional steam directly to said intermediate stages of the blade system.

In testimony whereof I have signed my name. .7

OSCAR ANTON VVIBERG.

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