US 11,746,674 B2
Steam turbine and method for internally cooling the same
Minjin Tang, Shanghai (CN); Yifeng Hu, Shanghai (CN); and Kai Cheng, Shanghai (CN)
Assigned to SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO., LTD., Shanghai (CN)
Appl. No. 17/288,387
Filed by Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai (CN)
PCT Filed Apr. 2, 2019, PCT No. PCT/CN2019/081018
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/093649, PCT Pub. Date May 14, 2020.
Claims priority of application No. 201811313083.4 (CN), filed on Nov. 6, 2018.
Prior Publication US 2021/0381394 A1, Dec. 9, 2021
Int. Cl. F01D 25/12 (2006.01); F01D 5/02 (2006.01); F01D 25/14 (2006.01); F01D 25/26 (2006.01); F01D 3/04 (2006.01)
CPC F01D 25/12 (2013.01) [F01D 3/04 (2013.01); F01D 5/02 (2013.01); F01D 25/14 (2013.01); F01D 25/26 (2013.01); F05D 2220/31 (2013.01); F05D 2240/52 (2013.01); F05D 2260/20 (2013.01); F05D 2300/17 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A steam turbine, comprising: an outer casing and an inner casing; a rotor having a balancing piston, the rotor being rotatably mounted inside the inner casing; and a steam flow channel formed between the inner casing and the rotor, wherein a plurality of moving blades fitted with the rotor and a plurality of stationary blades fitted with the inner casing are alternately arranged to form multiple stages of blade groups, an interlayer for steam to circulate is formed between the inner casing and the outer casing, and live steam is sent into an inlet steam chamber inside the inner casing and enters the flow channel from the inlet steam chamber; wherein:
the multiple stages of blade groups include a first set blade staging and a second set blade staging; and the top of the balancing piston is provided with a first chamber and a second chamber; and
a first channel disposed in the inner casing connects the flow passage downstream of the first set blade staging to the first chamber; and a second channel connects the second chamber to the interlayer and connects the interlayer to the flow passage downstream of the second set blade staging;
wherein the second chamber is disposed proximal to the inlet steam chamber, the first chamber is disposed distant from the inlet steam chamber, the second chamber and the first chamber being arranged in a fore-and-aft manner along the axial direction of the rotor.