Magnetically driven cyntrifical pump

Claim 1

A magnetically driven 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 by way 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 the inward end portion thereof while holding an impeller on the outward end, the rotating shaft being supported with an interposing bearing of ceramic material of non-rotation which is fitted into an secured to a supporting member fixed in the pump casing, a thrust bearing of ceramic bearing being secured to the rotating shaft for integral rotation and juxtaposed in contact with said interposing bearing of non rotation so as to receive an axial load of the rotating shaft, a flange, for determining outward the position of the follower rotor, which is provided integrally on the rotating shaft at a predetermined position separated inwards from the thrust bearing, and a cushioning member being mounted on the rotating shaft in the position between the thrust bearing and said flange so as to positively push the thrust bearing continuously outwards from the rear against the interposing bearing of non-rotation, directly, whereby the rotational side thrust bearing can continue in contact with the interposing bearing of non-rotation without loosening.