Patent ID: 7249939

Claim:
A rear casing arrangement for a magnetic drive pump, said magnetic drive pump comprising: a front casing having an intake port directed in the longitudinal axis direction and a discharge port directed in the radial direction, a rear casing defining an inner pump chamber in cooperation with the front casing, an impeller disposed in the pump chamber, a rotor for being rotated in unison with the impeller and having a driven magnet, rotor support means for rotatably supporting the rotor, and a drive magnet disposed on the outside of the rear casing such as to face the driven magnet on the rotor via the rear casing and magnetically coupled to the driven magnet for causing rotation of the rotor in unison with the impeller, whereby a pump supply fluid such as a chemical fluid or a semiconductor processing fluid is caused to flow into the pump chamber from the intake port and out of the pump chamber from the discharge part for execution of the pump operation, said rear casing including: a flange part mounted on the front casing, a cylindrical barrel part interposed between the rotor and the drive magnet, said barrel part having a front end integral with the flange part and a rear end, and a rear end part integral with the rear end of the barrel part and having a closed rear end, said rear casing having a reinforcing belt-like ring member woundly fitted on the outer periphery of a cylindrical barrel part of the rear casing, said ring member having a width smaller than the length of the cylindrical barrel part of the rear casing.