US2254520A - Turbine governor - Google Patents

Description

J. C. GARROTT TURBINE GOVERNOR Filed June 1, 1957 Sept. 2, 1941.

JOf/NG. GARROTT 59mm m 8 W Patented Sept. 2, 1941 oF'FioE 2,254,520 7 TURBINEGOVERNOR John 0. Garrett, Houston, Tex.

Application June 1, 1937, Serial No. 145,704

2 Claims.

The present invention relates to an overspeed governor of a type which may be used in connection with turbine generators to control the rate of speed of the generator. It seems obvious that the device may be applied in other fields, however.

An object of the invention is to provide a governor for a shaft which includes a statically unbalanced element which will normally rotate in a balanced position with the shaft of the device but which assumes an eccentric position when the shaft rotates at greater than a predetermined speed and whereby such element then serves to control the speed of the shaft.

Another object of the invention is to provide an overspeed governor which operates on the principle of centrifugal force to control the speed of a rotating shaft.

Other and further objects of the invention will be readily apparent when the following description is considered in connection with the accompanying drawing, wherein:

Fig. -1 is an elevational view of the shaft gov ernor comprising an element of the invention.

Fig. 2 is an elevational view of the governor, the view being shown at right angles to that of Fig. 1.

Fig. 3 is an end elevation of the shaft governor shown in Figs. 1 and 2.

Fig. 4 is a partial section of the governor showing a structural detail.

Turbines of the impulse or reaction type are used extensively as prime movers to utilize the inherent advantages thereof, as is well known in the art. The present invention is illustrated in Fig. 1 as used in a turbo-generator unit, but it is to be understood that this particular use of the invention and the following particularized description are not in any way limitative of the adaptability of the device of the invention for use with other prime movers and equipment driven thereby.

The governor 50 is shown in elevation in Fig. 1 and certain of the details thereof are shown in Figs. 2, 3, and 4. The main body 90 of the governor is a hollow cylinder, the internal bore of which is reduced. This reduced bore is provided with threads 93 as seen in Fig. 3 whereby the governor unit can be threadably attached to the end of the shaft I5, the speed of which the device is to govern. The body 90 has its walls cut away at 94 to provide an opening to receive angular shaped weights 95 which have a knife edge contact at 96 with hardened steel blocks 91 attached to the flange 98 near one end of the body 90. Positioned within the body is a sleeve H30 having a cup-shaped outer end "H in which is fixed an anti-friction bearing. A thrust member I04 is mounted within this hearing and in this manner is utilized as a thrust bearing to impart thrusts from sleeve I00 to an arm at the end of the governor to which said member I04 may be connected.

One of the features of the present invention resides in the provision of a disc H0, seen in figures of the drawing. This disc is mounted upon a cylindrical extension HI on the face of the flange 93 of the governor unit 50. The face of this disc ll 0 is channeled at H2 to receive a compression spring H3 which surrounds a pin H4 which is threaded into a cylindrical extension HI. An adjusting nut H5 receives the nut of the spring H3 so as to control the tension of the compression thereof. This spring forces the disc H0 into contact with the cylindrical extension Ill.

Diametrically opposite the pin H4 an opening in the disc H0 is elongated as indicated by the dotted line at H6 in Fig. 3.

A pin H1 is screwed into the extension Ill opposite to the pin I I4 and is slidably fitted within a radial opening in the disc III]. This con-' struction permits the disc H0 to be moved axially of the pin H4 and H! by the application of sufficient pressure to overcome the tension of the spring H3. In this manner the disc HI] may move to an unbalanced or off-center position relative to the shaft 15 with which it is rotated.

The elongation of the openings within the disc H0 permit the center of gravity of the disc to be displaced toward the spring H3 so that as the speed of rotation of the shaft increases beyond a predetermined limit, which is controlled by the compression on the spring H3, the disc H0 will move to an off-center position. Such position is indicated by the dotted lines H6 of Fig. 3.

In operation the governor unit 50 will control the rotation of the shaft and prevent an excessive speed thereof due to the fact that the disc H0 will become unbalanced in moving to an eccentric position. This movement of the disc H0 can be utilized in any desired manner to control the source of power which is effectin the rotation of the shaft l5 upon which the device is mounted.

The overspeed governor will automatically reset itself when the speed is reduced within the limit which has previously been predetermined.

What is claimed is:

1. An over-speed responsive governor comprising a body adapted to be fixed to a rotating shaft and having a cylindrical portion, a disc surrounding said cylindrical portion, said disc having an axial oblong opening of which the ends are respectively concentric and eccentric with the peripheral surface of the disc and of a width to slidably fit upon the body, a radial opening in the disc from the concentric surface in the oblong opening, a pin fixed to said bodyand slidably passing through the radial opening, a. spring surrounding said pin and :having its inner end in engagement with the disc, and means for adjustably compressing said spring to apply a force to hold the disc in concentric relation with the body at normal speeds.

2. An over-speed responsive governor ecom- :the body at normal speeds.

shaft and having a cylindrical portion, a disc having an oblong opening through which the cylindrical portion passes, a portion of said opening being concentric with the periphery of the disc, whereby said disc is unbalanced, an annular channel in a radial face of thedisc, a radial opening through the walls of aid channel from the concentric surface of the oblong opening, a pm fixed to said body and slidably passing through said radial opening, a spring within said channel and surrounding said pin and an ad- .justing nut on said pin to adjustably apply a.

'force to hold the disc in concentric relation with JOHN c. .GARROTT.

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