Patent ID: 9188127
Filing Date: 2015-11-17
Classification: F04D,H02K

Abstract:
1. A drive unit of a magnetic coupling pump with an impeller, which is rotatable around a rotation axis, and a driven magnet, which is made of a permanent magnet and is fixed to the impeller, the drive unit comprising: a magnetism shielding body formed of a paramagnetic material and having a bottomed tubular shape; a mount part formed from resin, the mount part including an engaging portion formed at an outer peripheral edge thereof and engaging an opening edge of the magnetism shielding body, and blocking an opening of the magnetism shielding body, the mount part being capable of attaching to the magnetic coupling pump, the mount part having a bottomed cylindrical portion, the bottomed cylindrical portion having a drum section, the drum section being a fitting portion into which a pump casing of the magnetic coupling pump fits so that the magnetic coupling pump is capable of being detached from the mount part; a driving magnet formed of a neodymium magnet and positioned at an outside of the driven magnet of the magnetic coupling pump with respect to a rotation axis of the magnetic coupling pump attached to the mount part so as to face the driven magnet with a gap; a magnet retaining ring formed of a ferromagnetic material and including a tube portion having a tubular shape centered on the rotation axis of the magnetic coupling pump attached to the mount part, the magnet retaining ring being provided inside the magnetism shielding body with a gap, the driving magnet being fixed to an inside of the tube portion; a motor disposed inside the magnetism shielding body to rotate the magnet retaining ring around the rotation axis of the magnetic coupling pump attached to the mount part; a plurality of convex shaped cooling fins formed on an outer circumferential surface of the magnetism shielding body, wherein the cooling fins are formed so as to extend in a circumferential direction of the magnetism shielding body at predetermined intervals in an axial direction of the magnetism shielding body; and a channel formed on an outer circumferential surface of the engaging portion of the mount part, wherein a sealing member is accommodated in the channel.