The manufacturing process for turbo-expanders is complex, involving multiple stages such as design, material preparation, component machining, assembly, inspection, and trial operation. Production begins by establishing specific technical requirements based on the equipment's operating conditions-including expansion pressure, inlet and outlet temperatures, flow rate, rotational speed, and the working medium-followed by structural design and component selection based on these parameters. Given the high rotational speed of the internal rotor, the design and manufacturing processes demand high standards for dimensional accuracy and dynamic balance, particularly for critical components like the impeller and shaft.
During the component manufacturing phase, materials are prepared according to design drawings and undergo inspection. Components such as the casing and volute typically undergo casting or forging followed by machining, while critical parts like the shaft and impeller require precision machining processes such as turning, milling, and grinding. Impeller machining is particularly critical, as blade geometry directly affects gas flow and expansion efficiency. Once machined, components undergo checks for dimensions, surface quality, and material properties to ensure compliance with design specifications.
After component machining is complete, the process moves to the assembly stage. Assembly involves installing the impeller, shaft, bearings, seals, and other auxiliary components in the prescribed order and adjusting the clearances between mating parts. As turbo-expanders are high-speed rotating machines, the assembled rotor typically undergoes dynamic balancing tests to minimize vibration during high-speed operation. Additionally, the installation of bearings and seals is verified to ensure the rotor rotates smoothly and freely.
