发明名称 |
Turbine rotor blade root attachments |
摘要 |
A pinned root fixing arrangement of axial flow steam turbine rotor discs made of a low alloy that is less susceptible to stress corrosion cracking (SCC). Such an arrangement has a first ratio, which is defined as ratio of the axial breadth of the disc fingers and the sum of the axial breath and the axial breadth G of the gap between adjacent disc fingers, in the range of about 0.4 to about 0.6 and further has a second ratio, which is defined as the ratio of the length of the disc fingers and the blade fingers to the diameter, between 4 and 6. |
申请公布号 |
US9429028(B2) |
申请公布日期 |
2016.08.30 |
申请号 |
US201313950337 |
申请日期 |
2013.07.25 |
申请人 |
ALSTOM Technology Ltd |
发明人 |
Buguin Arnaud;Floch Michel;Lemaire Julien |
分类号 |
F01D5/30 |
主分类号 |
F01D5/30 |
代理机构 |
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代理人 |
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主权项 |
1. A pinned root fixing arrangement for an axial flow steam turbine rotor disc, said arrangement comprising:
cylindrical pins running axially through bores of an increased stress-reducing diameter in inter-digitated blade root fingers and disc fingers, wherein a first ratio (b/M), defined as an axial breadth (b) of disc fingers to a sum of the axial breadth (b) and an axial breadth (G) of a gap between adjacent disc fingers (M), is in a range of 0.4 to 0.6 and a second ratio (L/D), defined as a length (L) of the disc fingers and the blade root fingers to the diameter (D), is 5.8. |
地址 |
Baden CH |