US2014956A - Power set - Google Patents

Description

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H. TREITEL '2,914,956

POWER SET Filed April 9, 1934 Inventor: Hirwr-ih Treibel,

E. 9M M bij jf/Itto Patented Sept. 17, 1935 UNITED STATES POWER SET Heinrich Treitel, Berlin, Germany, assignor to General Electric Company, a corporation of New York Application April 9, 1934, Serial No. 719,805 In Germany April 13, 1933 2 Claims.

The present invention relates to power sets such as turbo-generators and has for its object an improved construction and arrangement of such sets.

For a consideration of what I believe to be novel and my invention, attention is directed to the following specification and the claims appended thereto in connection with the accompanying drawing which forms a part of my specication. Y

In the single gure of the drawing I have shown a turbo-generator set such as may be used for lighting purposes in trains and the like.

The set comprises an electric generator I8 which may be of the direct current type having a shaft II supported by anti-friction bearings I2 and I3. The generator is driven by an elastic fluid turbine i4 having a casing I5 with an inlet It for elastic fluid and an exhaust chamber I'I. The turbine has a single stage comprising a nozzle member I8 suitably bolted or otherwise fastened on the casing and a bucket wheel I8 secured to an overhung portion 20 of the generator shaft II. The elastic fluid is conducted from the inlet I6 through a valve chamber 2I and a channel 22 forming a part of the casing to the nozzle or nozzles 23 of the member I8, whence the elastic fluid is guided in proper direction towards the blades of the bucket wheel. Member I8 may have only a single nozzle 23, or there may be two or more. The elastic iiuid discharged from the bucket wheel flows into a chamber 24 which communicates with and forms a part of the exhaust chamber I'I having an outlet IIa. The bucket wheel has a hub 25 secured to the overhung shaft portion 28. A packing 26 is provided between the hub 25 and an end plate 21 of the turbine to reduce leakage of elastic fluid. The generator VI0 is provided With a plate 28 adjacent the turbine to prevent leakage uid from entering the interior of the generator. The flow of elastic uid to the turbine is controlled by a speed governing mechanism and a `va1ve in response to speed changes of the set. The speed governing mechanism includes a speed governor 29 located in the exhaust chamber I'I of the turbine. The speed governor has two iiyweights 38 and 3I pivotally connected to brackets 32 and 33 respectively. The pivotal connections between the fly-weights and the brackets are formed by knife-edged members 34 and 35 respectively. The brackets 32 and 33 are rigidly secured to or form a part of the bucket wheel I9. Each fly-weight has an arm 36 and 31 respectively. The ends of the arms are connected to a hub of a disk 38 by means of a pivot 39. The iiy-weights are biased inwardly by means including a tension spring 4I) connected to knife-edged members 4I and 42 on the fly- 35 and 3l together with the pivot 39 moves to l0 the right. This movement is transmitted to a valve mechanism to effect decreased flow of fluid to the turbine. The Vvalve mechanism includes a movable valve member 43 secured to a shaft 44 in alinement with the shaft II of the set. The l5 shaft projects through a sleeve member 45 fastened to the turbine casing. The member 45 has an opening registering with the aforementioned inlet I8 and defines the inlet chamber 2I and seat 45 for the valve 43.

member 45 the stem 44 is provided with packings 41 and 48. The right-hand end portion of the sleeve member 45 is recessed to accommo- To reduce leak- 20 age of steam along the inner surface of the sleeve y date a sleeve 49, which latter forms a part of 25 a recessed disk 58, and is rigidly secured to the valve stem 44. Movement of the speed governor is transmitted to the disk 50 by the rotatable plate 38 through the intermediary of a non-rotatable disk 5I made of hard carbon and 30 held in the recess of the disk 50.

As the hard carbon disk 5I as well as the rotary disk 38 are located in the exhaust end of the turbine where they are subjected to the eroding and corroding effects of wet steam,

provide the surface of at least one of the disks with a material which is not affected by wet steam, or make the rotary disk 38 entirely of such material. This is an important feature of my invention. shown the disk 38 as comprising two halves, a right-hand half 52 adjacent the governor made of steel, and a left-hand half 53, contacting the carbon disk, made of non-corroding and noneroding material. any suitable means, for instance, soldering or brazing. A suitable material for the contacting plate 53 I have found to be a sintered mixture of copper and Wolfram. The valve stem In the present instance I have 40 The two halves are united by 45 44 is biased towards the right by a compression 50 spring 54 located in a cylindrical body 55, which latter is secured to the turbine casing. The biasing spring 54 tends to move the Valve member 43 towards its seat. A channel 56 establishes communication between the interior of the cylin- 55 drical body 55 and the exhaust chamber l1 to eliminate or compensate end thrust on the governing mechanism.

The operation of the turbo-generator set is as follows: On increase in speed of the generator, due to a decrease in load, eifects, as pointed out above, movement of the pivot connection 39 of the flyweight arms towards the right. The rotary disk 38 thereby is moved away from the carbon disk 5I, permitting the biasing spring 54 to move the valve member 43 towards its seat, resulting in a decreased flow of elastic iiuid to the turbine and accordingly a decrease in speed.

If the speed of the turbine decreases, due to an increase in load, the flyweights are moved together by the action of the governor spring 40, causing movement of the rotary disk 38 towards the left, that is against the carbon disk, thereby effecting opening movement of the valve member 43 against the action of the biasing spring 54. The flow of fluid to the turbine thereby decreases, resulting in increased speed of the generator and accordingly increased load output. Thus, movement of the valve during increasing load is directly accomplished by the speed governor, Whereas movement of the valve during decreasing load is indirectly accomplished by the speed governor and directly by the spring 54. In the latter case the plate 38 merely moves away from the carbon disk 5I to permit movement of the valve member 43 towards its seat by the compression spring 54.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In a turbo-generator set, an elastic fluid turbine having a bucket wheel and an inlet valve for controlling the flow of fluid to the turbine, said valve having a stem in alinement with the turbine shaft, a speed governing mechanism located in the exhaust chamber of the turbine and including a speed governor having flyweights driven by the shaft, a rotary disk secured to the flyweights, and means for transmitting movement from the rotary disk to the valve comprising an axially movable carbon plate fastened to the valve stem and a spring biasing the plate against the face of the rotary disk, the rotary disk being made at least partly of a sintered mixture of copper and Wolfram to reduce wear between the rotary disk and the axially movable carbon plate.

2. In a turbo-generator set, an elastic fluid turbine having a bucket wheel and an inlet valve for controlling the flow of fluid to the turbine, said valve having a stem in alinement with the turbine shaft, a speed governing mechanism located in the exhaust chamber of the turbine and including a speed governor having fiyweights driven by the shaft, a rotary disk secured to the flyweights, means for transmitting movement from the rotary disk to the valve, said means comprising a carbon plate secured to one end of the valve stem and a spring engaging the other end of the valve stem to bias the carbon plate against the rotary disk and means for compensating axial thrust on the carbon plate by the exhaust fluid.

HEINRICH 'IREITEL

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