Patent ID: 7033146
Filing Date: 2006-04-25
Classification: F04D

Abstract:
1. A magnetic drive sealless pump comprising: a casing having a fluid suction opening and a fluid discharge opening; a shell combined to a rear part of the casing, an exterior of the shell is provided with a bracket disposed with a motor for driving and rotating a drive magnet; a center of the shell is provided with a shaft enveloped with a bearing, the bearing having an outer periphery configured with a plurality of chord-wise planar ramps, and an interior of the bearing is provided with a spiral fluid passage; a capsule positioned between the bearing and the shell, an interior of the capsule houses a driven magnet situated between the bearing and the drive magnet, the capsule is extended into the casing, and a front part of the capsule is provided with an impeller; the impeller, the capsule and the bearing are integrated together to form a rotating member of the pump, and at front and rear parts of the rotating member are each provided with a thrust ring for preventing axial movements of the rotating member; and a plurality of channels are formed between the bearing and the capsule by said chord-wise planar ramps, the channels along with the spiral fluid passage forming a convective cooling passage, whereby a convective cooling effect is provided at both the interior and an exterior of the bearing to prevent overheating due to dry running.