Centripetal turbine power generation device suitable for ultralow flow and high pressure ratio

The utility model discloses a centripetal turbine power generation device suitable for ultralow flow and high pressure ratio, and belongs to the technical field of turbine power generation devices. The power generation device comprises a gear box, a first-stage turbine, a second-stage turbine, a third-stage turbine, a fourth-stage turbine and a generator, the middle output end of the gear box is connected with the generator, the first-stage turbine and the second-stage turbine are arranged at the front input end and the rear input end of the high-pressure side of the gear box respectively, and the third-stage turbine and the fourth-stage turbine are arranged at the front input end and the rear input end of the low-pressure side of the gear box respectively. An inlet of the first-stage turbine is a high-pressure inlet, an outlet of the first-stage turbine is connected with an inlet of the second-stage turbine through a pipeline, an outlet of the second-stage turbine is connected with an inlet of the third-stag