(57) [summary] [purpose] cause around the sky is the bearing and the shaft accumulate air points less likely to be discharged and air accumulated in the space between the partition walls of the bottom and the rotor by the operation of the pump, the sliding contact portion by the suction force of the permanent magnet having the point as well as the rotor temperature rises of, it wants to prevent rotation trouble when impurities are sucked with the magnetism of iron or the like contained in the pump liquid being pumped. [Configuration] Kyandomo - In Taponpu rotor birch the outer circumference of the rotor - is covered by the rotor birch - the outer peripheral surface of the is configured to form a spiral groove extending in the axial direction. In this case, a boss portion of the impeller is fitted to the bearing forms a cylindrical shape, also the axial grooves in the outer periphery of the bearing 1 Pieces or plurality formation, the grooves by is a bearing chamber and the outside, which is closed by a bearing at both ends so as to communicate and rotor birch - it is desirable that the made of resin.
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