A magnetically driven centrifugal pump so designed that a drive power of an electric motor is transmitted from a magnets-embedded drive rotor to a magnets-embedded follower rotor opposed to one another for formation of a magnetic coupling; comprising a pump casing separated internally by a partition into two rooms of which one accommodates the drive rotor and the other accommodates the follower rotor, a rotating shaft holding the follower rotor on an inward portion thereof while holding an impeller on an outward end portion, Chemical pumpsthe rotating shaft being supported with a sleeve-shaped radial bearing of ceramic material of non-rotation which is fitted into a supporting member fixed in the pump casing, a sleeve-shaped supplementary bearing of ceramic material set inside said sleeve-shaped radial bearing in mutual contact and secured on the rotating shaft,Self-priming pumps a thrust bearing of ceramic material being secured to the rotation shaft for integral rotation and juxtaposed in a condition of direct contact with rear ends of said radial bearing of non-rotation and said supplementary bearing so as to receive an axial load of the rotating shaft, said radial bearing of non-rotation being adapted to move only in an axial direction, and a cushioning member being mounted compressedly in an interspace between a front end of the radial bearing and a circular edged projection of the supporting member which are opposed to one another. The present invention relates to a magnetically driven centrifugal pump, particularly of a single suction structure, in which an impeller is rotated by way of a magnetic coupling between a magnets-embedded follower rotor interconnected with the impeller and a magnets-embedded drive rotor interconnected with an electric motor. the present invention provide a magnetically driven centrifugal pump so designed that a drive power of an electric motor is transmitted from a magnets-embedded drive rotor to a magnets-embedded follower rotor opposed to one another for formation of a magnetic coupling; comprising a pump casing separated internally by a partition into two rooms of which one accommodates the drive rotor and the other accommodates the follower rotor, a rotating shaft holding the follower rotor on an inward portion thereof while holding an impeller on an outward end portion, the rotating shaft being supported with a radial bearing of ceramic material of non-rotation which is fitted into a supporting member fixed in the pump casing, a thrust bearing of ceramic material being secured to the rotating shaft for integral rotation and juxtaposed in a condition of contact with said radial bearing of non-rotation so as to receive an axial load of the rotating shaft, and a cushioning member being mounted compressedly in an interspace between a front end of the thrust bearing and a circular edged projection of the supporting member which are opposed to one another.

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2012-01-18

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