The impeller axial lock regulates the shaft center traverse on the axis of the impeller. Around the axis it alienates the impeller, from the shaft liner which distribution facilities is done in shaft center direction. The aforementioned impeller axial lock with the aforementioned impeller and the aforementioned shaft liner has the ring component which distribution facilities is done around the aforementioned axis. This ring component has the substance which forms with the 1st engagement tub and the 2nd engagement tub which is engaged in the aforementioned axis and is engaged in the aforementioned shaft liner the 3rd engagement tub which are engaged in the impeller. The aforementioned shaft liner locks, through the aforementioned 3rd engagement tub, in order for this ring component to regulate the shaft center traverse of the impeller in the midst of turning of the impeller and on the aforementioned axis the aforementioned ring component vis-a-vis the aforementioned axis. It engages the aforementioned 2nd engagement tub, in the groove which was formed to the aforementioned axis, it engages the aforementioned 3rd engagement tub in the groove which was formed to the aforementioned shaft liner.
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