Some photos of centrifugal high-speed fans
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Built-in oil pump; the high-speed shaft is also the output shaft, the medium-speed shaft is the input shaft, which is also the low-speed shaft; radial tilting pad bearings and axial thrust bearings
Eliminate zero responses; also, I’d like to ask the original poster whether this compressor is a Sundyne high-speed compressor Ours also has this gearbox structure