Because the adjustment pin (50) rotates in the shaft receiving hole (44), the adjustment pin (50) and the control pin (48) are maintained to be in surface contact with each other independent of the magnitude of the relative angle ϑ.
The present invention suppresses hemolysis stemming from the shear stress accompanying impeller rotation, while securing the effect of increasing flow speed in the vicinity of the lower bearing by means of the sealing member.
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