US 12,435,727 B2
Rotor structure and methodology for assembly or disassembly of such rotor structure
Kevin Miny, Essen (DE)
Assigned to SIEMENS ENERGY GLOBAL GMBH & CO. KG, Munich (DE)
Appl. No. 18/840,953
Filed by Siemens Energy Global GmbH & Co. KG
PCT Filed Apr. 15, 2022, PCT No. PCT/US2022/025020
§ 371(c)(1), (2) Date Aug. 23, 2024,
PCT Pub. No. WO2023/200454, PCT Pub. Date Oct. 19, 2023.
Prior Publication US 2025/0163927 A1, May 22, 2025
Int. Cl. F04D 29/054 (2006.01); F04D 17/10 (2006.01); F04D 29/62 (2006.01)
CPC F04D 29/054 (2013.01) [F04D 17/10 (2013.01); F04D 29/624 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for assembling and disassembling a rotor structure in a turbomachine, the method comprising:
supporting a plurality of impeller bodies on a tie bolt;
threadingly connecting a first coupling nut with the tie bolt to axially press the plurality of impeller bodies to define a compression section of the turbomachine, wherein the threadingly connecting of the first coupling nut is arranged to apply a first coupling force within the compression section to hold the compression section of the turbomachine attached during rotating operation of the turbomachine;
positioning a rotor shaft portion adjacent the compression section;
threadingly connecting a second coupling nut with the tie bolt to axially press the rotor shaft portion onto the compression section, wherein the threadingly connecting of the second coupling nut on the tie rod is arranged to apply a second coupling force to the rotor shaft portion to hold the rotor shaft portion affixed onto the compression section during a non-rotating condition of the turbomachine;
after threadingly connecting the second coupling nut on the tie bolt, assembling at least one component of the turbomachine about the rotor shaft portion, wherein the assembling is carried out without unloading the first coupling force within the compression section; and
disposing an O-ring in a circumferentially-extending groove in a rotor shaft end, the O-ring positioned to circumferentially abut against a head of the second coupling nut.
 
14. A turbomachine comprising:
a tie bolt;
a plurality of impeller bodies stacked adjacent one another on the tie bolt;
a first coupling nut threadingly connected with the tie bolt to axially press the plurality of impeller bodies to define a compression section of the turbomachine, wherein the first coupling nut is arranged to apply a first coupling force within the compression section to hold the compression section of the turbomachine affixed during rotating operation of the turbomachine;
a rotor shaft portion adjacent the compression section;
a second coupling nut threadingly connected with the tie bolt to axially press the rotor shaft portion onto the compression section, wherein the second coupling nut is arranged to apply a second coupling force to the rotor shaft portion, wherein the second coupling force is smaller than the first coupling force to hold the rotor shaft portion affixed onto the compression section during a non-rotating condition of the turbomachine; and
a dowel pin positioned to engage the second coupling nut and hold the second coupling nut in place.