US1613868A - Means for controlling the flow of elastic fluid in turbines - Google Patents

Description

Jan. 11 1927. 1,613,868

R. BIRMANN MEANS FOR CONTROLLING THE FLOW OF ELASTIC FLUID IN TURBINES Filed Feb. 15. 1926 Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

RUDOLPH BIB/MANN, OF TREN TON, NEW JERSEY, ASSIGNOR TO THE DE LAVAL STEAM TURBINE COMPANY, OF TRENTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MEANS FOR CONTROLLING THE FLOW OF ELASTIC FLUID IN TURBINES.

Application filed February 13, 1926.

My invention relates to means for con- .trolling the flow of elastic fluid in turbines and more particularly in turbines of the bleeder type.

The object of my invention, is primarily to provide means for controlling the flow of, usually, a large volume of steam in a simpler, more economical and accurate manner.

My invention from the broad standpoint consists in the provision, within the casing of a turbine, of a double or multi-flow valve preferably of the partially or fully balanced type and so positioned that the cent-er line of the valve and the center line of the turbine rotor are substantially coincident.

More particularly my invention consists in providing valve seats on the diaphragm to which the steam flow has to be regulated and in supporting the valve from the diaphragm, the diaphragm being so shaped to admit the steam, which passes through the valve, guide it to the nozzle inlet and discharge it through the nozzles.

Having now indicated in a general way the nature and purpose of my invention, I will now proceed to a detailed description thereof Withreference to the accompanying drawing in which there is illustrated a prei'erred embodiment and in which The Fig. 1 is a sectional view of a portion of a turbine ot' the bleeder type embodying my invention, and Fig. 2 is a detail.

In the drawing a indicates the casing of the turbine and b the rotor shaft. 0 indicates the wheel of the last stage above the steam extraction point and (Z the wheel of the first stage after the steam extraction point, while 6 indicates a diaphragm associated with the wheel d. In the turbine illustrated, the steam is bled from the space The steam from space 7 entering the stage including the. wheel (Z is controlled by a valve g, having double seat faces g adapted to cooperate with valve seats h formed on diaphragm e in which is formed a passage 2' which guides the steam passing through the valve to nozzles y.

The valve 9, which is circular, is mounted on the hub 72 of diaphragm e and is retained thereon, as well as made longitudinally movable for opening and closing, by engagement with a very coarse thread Z cut on the hub.

The opening and closing of the valve is eiiected by its rotation on the thread Z which Serial No. 88,051.

is accomplished through the medium of a lever m operated through a rod 12, it being observed that due to the coarseness of the thread only a fraction of a revolution is rotor, a diaphragm having a pair of valve seats formed thereon, a circular balanced valve adapted to cooperate with said seats and positioned within the casing with its center in substantial coincidence with the axis of rotation of the rotor.

3. In a turbine including a casing, a rotor and a diaphragm, a valve seat carried by the diaphragm, a valve positioned adjacent said diaphragm on an axis substantially coincident with the axis of the rotor and having a movement into open and closed position in a direction longitudinal of its axis.

4:. In a turbine including a casing, a rotor, a diaphragm, a pair of valve seats carried by the diaphragm, a passage formed in the diaphragm between said seats, a circular valve adjacent the diaphragm having faces adapted to cooperate with said valve seats for the control of said passage and means for imparting to said valve a movement in a direction axial of said rotor.

5. In a turbine including a casing, a rotor, a diaphragm, a hub formed on the diaphragm, a helix formed on the hub, a pair of valve seats carried by the diaphragm, a passage formed in the diaphragm between said seats for the distribution of steam, a circular valve supported on said hub, said valve having faces adapted to cooperate with said valve seats for control of the passage of steam into said passages and having a central aperture within which is formed a helical groove for the reception of said helix and means for rotating said valve relative to said helix whereby said valve will be moved axially of said hub.

In testimony of which invention, I have hereunto set my hand, at Trenton, N. J., on this 8th day of February, 1926.

RUDOLPH BIRMANN.

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