(57) [summary] [purpose] circumferential direction of the impeller with respect to the rotation axis without using a separate component, along with the obtained a fixed force in the axial direction, it will provide an excellent impeller sealing performance between the axis of rotation. [Configuration] The outer tube 4 having wings 10 and a cylinder 5 among which is arranged in the outer cylinder 4 by connecting an annular connecting portion 6, The shaft fixing holes 7 annularly formed between the inner cylinder 5 and the outer cylinder 4 and an inner cylinder 5 closes the inlet side of the shaft fixing hole 7 in the bottom 8.
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