US1490907A - Steam turbine - Google Patents

Description

April 22, 1924. 1,490,907

' K. BAUMANN STEAM TURBINE Filed Aug. 13. 1920 ATTORNEY Federated Apr. 22, 1924.

omrso STATES PATENT orrlcs.

KARL BAUMANN, OF URMSTON, ENGLAND, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

WESTINGHOUSE ELECTRIC PENNSYLVANIA. i

AND MANUFACTURING COMPANY, A CORPORATION OF STEAM TunBINE.

Application filed August 13, 1920. Serial No. 403,257.

To all whom 1,225 may concern: 7

Be it known that I, KARL BAUMANN, a citizen of the Confederation of Switzerland, and a resident of Urmston, in the county of Lancaster, England, have invented a new and useful Improvement in Steam Turbines, of which the following is a specification.

This invention relates to steam turbines of the axial fiow type and particularly to removable nozzle boxes used with turbines of this type of the kind described in the specifications of Letters Patent Nos. 1,286,201 of December 3, 1918, 1,325,135 of December 16, 1919, 1,873,289 of March 29, 1921, and 1,379,- 258 of May 24, 1921'. The inventionhas for its object to provide an improved form of the nozzle box described in the specifications aforesaid, especially adapted for use with turbines the first stage of which comprises a multiple velocity wheel.

According to this invention the nozzles through which the steam issues are located on the inner circumference or concave surface of the nozzle box, and the box itself is so formed as to support one or more rows of the guide blades which are located intermediate the rows of moving blades on the multiple velocity wheel.

The preferred form of my invention will now be described with reference to the accompanying drawings in which Fig. 1 is a view, partly sectional, of the high pressure end of a steam turbine having the improved nozzle box located therein, the guide blades on the nozzle box being omitted for clearness. Fig. 2 is a section on the line IIIL Fig. 1, with the guide blades shewn in position. Fig. 3 represents a development of the lower face of the nozzle box cover plate or cap shewing the arrangement of nozzles and steam ports. Fig. 4 is a developed view of the face of the nozzle box, on

which the plate or cap is mounted. Figs. 5 and 6 are sections of the nozzle box on the lines II-II and VIVI, respectively, of

Fig. 1. Fig. 7 is a fragmentary and developed sectional view along the line VIL- VII of Fig. 1.

Referring to the drawings, the nozzle box 1 located in the lower half of the turbine cylinder 2 is provided on its inner circumference with a facing 3 on which is bolted or otherwise suitably aiiixed a cover plate or cap 4 having a faced surface 5. the two surfaces thus making a substantially steam tight joint between the box 1 and its cover or cap {1. The nozzle box 1 is further provided with a diaphragm 6 thereby dividing it into two steam chambers 7 and 8 which communicate with ports 9 and 10 respectively situated in the face, 3. These ports 9 and 10 in turn communicate with corresponding ports 11 and 12 in the face 5 of the cover 4 and co-operate with them to admit. steam tothe nozzles 13 and 14. situated on its lower surface. The'nozzles 13' and 14: are formed by the guide blades 15 located when in position between the face 16 of the cap- 1 and the inner circumferential face 3 of the box 1, the guide blades 15 The nozzle box 1 is further provided with a facing 17 having a suitable recess 18 in which a row of intermediate guide blades 19 are mounted in the proper position with reference to the moving blades 20 and 21 on the wheel 22 of the turbine rotor.

I claim as my invention 1. In a turbine, an arcuately-arranged nozzle box having a motive-fluid connection at one end, nozzle passages arranged at the concave side thereof, and an interior passage for establishing communication between the motive-fluid connection and the nozzle passages. I

2. The combination with a turbine rotor having a row of impulse blades, of a nozzle box extending circumferentially of the rotor for supplying motive fluid to the nozzle passages and a row of reversing vanes arranged between said rows of blades and carried by the concave side of said box.

4. A nozzle box for an impulse turbine comprising an outer box portion having a.

motive-fluid supply passage therein and an inner plate portion cooperating with the concave side of said outer box portion to define nozzle passages in communication with said supply passage.

5. A curved nozzle box for an impulse turbine comprising an outer box portion having a motive-fluid supply passage extending lengthwise thereof andadapted to communicate with a motive-fluid supply connection at one end and an inner plate portion cooperating with the concave face of the outer box portion to define nozzle passages communicating with said motive-fluid supply passage.

6. A curved nozzle box for an impulse turbine comprising an outer box portion 7 having a plurality of motive-fiuid supply passages and an inner plate portion coopcrating with the concave face of the outer box portion to define a plurality of groups pulse turbine comprising an outer box member havin an interior concave face and a motive-fluid supply passage extending lengthwise thereof and an inner member having a convex face cooperating with the.

concave face of said outer member to define a plurality of nozzle passages which communicate with said motive-fluid supply passage.

In testimony whereof, I have hereunto subscribed my name this th day of July,

KARL BAUMANN.

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