Abstract: Disclosed is a corrosion-resistant magnet pump comprising a front casing, a rear casing provided behind the front casing with a partition wall interposed therebetween, a rotary shaft extending from the front casing into the rear casing and supported by a bearing provided at least in the partition wall, an impeller fixed to the rotary shaft within the front casing, a driven magnet drivingly connected to the rotary shaft within the rear casing and a drive magnet provided outside the rear casing and drivingly rotatable by a motor, the portions of the pump to be exposed to a liquid being made of a corrosion-resistant material, the impeller being fitted around the front end of the rotary shaft and fastened to the rotary shaft by an impeller nut screwed on the front end, the magnet pump being characterized in that the impeller comprises a ceramic insert in the center of the impeller and the remaining portion of corrosion-resistant synthetic resin around the insert, the insert having a rear end face projecting rearw

Abstract: An inner magnet rotor for a magnet pump includes a yoke, magnets arranged on the yoke, a first holder, affixed to the yoke, for tightly holding the magnets at the front side of the yoke, and a second holder, affixed to the yoke for tightly holding the magnets at the rear side of the yoke. The first and second holders are lower in hardness than the magnets, and the magnets are chamfered at each of their front and rear ends to form a bevel face. Each of the first and second holders are formed with a slanting face opposed to the bevel face, the slanting face of each of the holders being at a smaller angle with respect to the axis of the rotor than the bevel face of each of the magnets before each holder is affixed to the yoke.

Abstract: A magnet pump comprising a front casing, a rear casing provided behind the front casing with a partition wall interposed therebetween, a rotary shaft extending from the front casing into the rear casing and supported by a bearing device provided in the partition wall, an impeller fixed to the rotary shaft within the front casing, a driven magnet drivingly connected to the rotary shaft within the rear casing and a drive magnet provided outside the rear casing and drivingly rotatable by a motor, the magnet pump being characterized in that the bearing device is formed at an intermediate portion thereof with lubricant supply channels, the partition wall having bores opposed to the rear plate of the impeller for guiding the liquid within the front casing into the rear casing therethrough, the rear casing having a supply bore for supplying a lubricant from outside into the rear casing therethrough, guide blades for guiding the liquid from the rear casing into the channels of the bearing device being provided on at

Abstract: The corrosion resistant pump of this invention comprises a drive magnet rotatable by a motor, a driven magnet rotatable by the rotation of the drive magnet, a yoke having the driven magnet attached to its outer peripheral surface and a pump rotary shaft connected by shaft fixing means and shaft drive connecting means to the assembly of the driven magnet and the yoke and rotatable by the assembly when the drive magnet is rotated by the motor. A covering layer of corrosion resistant synthetic resin is formed over the driven magnet-yoke assembly.