US981021A - Turbine. - Google Patents

Description

'W. E. SNOW;

Patented Jan. 10, 1911.

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Patented Jan. 10,1911

W. E. SNOW. TURBINE.

APPLIGA TION FILED MAY 1,1907.

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nrrnn STATES-PATENT orrion WILLIAM E. SNOW, OF DEDHAlVI, MASSACHUSETTS, ASSIGNOR TO B. F. STURTEVANT COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

TURBINE.

Specification of LettersPatent.

Patented Jan. 10, 1911.

Application filed May'l, 1907. Serial No. 371,210.

To all whom it may concern.

citizen of the United States, residing at Dedham, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Turbines; and I do hereby declare the following'to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

' The object of the present invention is to effect certain improvements in the construction of elastic fluid turbines, particularly with respect to convenience in manufactur ing and assembling such turbines and to the manner in which the various parts are secured together. These means will be pointed out more particularly in connection with the description of the illustrated embodiment of the invention, and the invention consists in the improved elastic fluid turbine hereinafter described, as defined in the cl aims.

In the drawings Figure 1 is a side-elevation of a turbine embodying the present invention, Fig. 2 is a vertical longitudinal section of the turbine, Fig. 3 is a transverse section on the line m00, Fig. 2 looking from right to left, and Fig. 4 is a transverse section on the line y y Fig. 2 looking from left to right.

The illustrated embodiment of the invention is a three stage turbine provided with a high pressure wheel 1, a medium pressure wheel 2 and a low pressure wheel 3, each of which is provided with two sets of periph eral parallehreturn buckets 4. The wheels are mounted upon'a tapered portion 5 of the shaft of the turbine, the wheel 3 being forced against a collar 6 on the shaft by means of a nut 7 acting through the wheels 1 and 2 and intermediate collars 8 and 9. The shaft passes through stuffing boxes 10 in the heads of the turbine casing and is journaled in compensating bearings 11.

The casing of the turbine comprises three sections, which may be designated for convenience the high-pressure section 12, the medium-pressure section 13 and the lowpressure section 14. These sections are secured to each other by flanges and bolts 15 and each section is divided on a horizontal plane passing through the axis of the turbine, as shown in Figs. 1, 3 and 4. In addichamber to another.

tion to the sections above designated the tur- Be it known that I, WILLIAM E. Snow,

bine comprises a head 16 forming an annular high-pressure steam chamber 17 and provided with an inlet 18, and a head 19 inclosing the exhaust chamber 20 in the low-pressure section 14. The exhaust chamber is provided with an outlet 21. 1

Each section carries a set of reversing guides formed in a ring 22 located in position to cooperate with the buckets 4 on the corresponding wheel. Beside each reversing-guide ring 22 is located a nozzle ring 23. The nozzle rings are formed in four parts, as shown in Fig. 4, for convenience in manufacture and assembly, and each part is held in place by radial screws 25 passing through a wall 26 in the casing section and "screwed into the nozzle ring. The nozzle rings are divided vertically into two sections 27 and 28, for convenience in forming the nozzles 29, Fig. 4, which are rectangular in cross section. There are two sets of nozzles in the high-pressure stage, arranged at an angle of 180; four in the medium-pressure stage as shown in Fig. 4; and eight in the low-pressure stage. The nozzles communicate through bowls 30 with the high-pressure chamber 17, the medium-pressure chamber 31 and the low-pressure chamber 32.

The medium-pressure section and the lowpressure section are provided with offset partitions 33 formed with spaces 34, as shown in Fig. 2, which form air cells and decrease the transmission of heat from one To prevent the leakage of motive fluid between the several wheel chambers the collars 8 and 9 are provided with flanges 35 engaging corresponding grooves in packing rings 36 located in the partitions 33 and forming labyrinthine packing joints. In addition to these joints spring packing rings 37 are provided, these rings being seated in grooves in the collars 8 and 9 and springing outward against the edges of the partitions.

To equalize the pressure on each side of the several wheels, the wheels are provided with openings 38 affording free passage for motive fluid.

To separate condensed moisture from the motive fluid, the several wheel chambers are provided with drainage passages. These are formed by recessing the nozzle rings as shown in Figs. 2 and 4, forming spaces 40 communicating through several smaller holes 41 with the adjacent chamber. The

moisture passing through these drainage passages 1s removed through drainage pipes 42, and by these means the moisture is prevented from getting into the buckets of the Wheels and interfering with the operation shaft in addition to the horizontal rows of 1 bolts 43 at their periphery. For this purpose through-bolts 44 are used, passing, as shown in Fig. 3, through the partitions 33 at'points inside of the periphery of the easing and adjacent to the shaft. In assembling the turbine the through-bolts of the low-pressure sect-ion are put in place and tightened, the medium-pressure section is then secured to the low-pressure section and fastened together by through-bolts, and the high-pressure section is then secured in place and fastened together in the same manner.

Having described'the invention, what is claimed is 1. An elastic fluid turbine, having, in combination, a shaft, a plurality of Wheels mounted thereon, a casing inelosing the wheels and having partitions between the Wheels, the casing being divided in a plane passing through the shaft, and through-bolts passing through the partitions inside the periphery of the casing to prevent separation of the central parts of the partitions, sub stantially as described.

2. An elastic fluid turbine, having, in combination, a shaft, a plurality of wheels mounted thereon, a casing inclosing the wheels and having partitions between the wheels, the casing being divided on a plane passing through the shaft, and throughbolts passing through the partitions close to the shaft and securing their halves together, substantially as described.

3. An elastic fluid turbine, having, in combination, a shaft, a series of wheels mounted thereon, and a casing consisting of a series of annular sections each comprising a partition located between two wheels and offset from the rest of the section, each section being divided on a plane passing through the shaft and having its two halves secured together by through-bolts passing through said offset partition, substantially as described.

4. An elastic fluid turbine, having, in combination, a wheel, a casing, a nozzle ring mounted in the casing and divided into segments, and screws passing radially through the casing wall and threaded into the segments to secure them in place.

5. An elastic fluid turbine, having, in combination, a wheel, a casing provided with an annular internal groove, and a nozzle ring mounted in the groove and provided at the bottom with a recess to form a passage between the ring and the casing for the escape of condensed moisture, substantially as described.

6. An elastic fluid turbine, having, in combination, a bucket wheel provided with two sets of peripheral parallel-return buckets located alongside of each other, a casing and removable nozzle rings and removable reversing guides secured in the casing in cooperative relation with the buckets of the wheel.

In testimony whereof I afiix my signature, in presence of two witnesses.

WILLIAM E. SNOV.

Witnesses HORACE VAN EvuREN, ALFRED H. HILDRETI-I.

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