Centrifugal pump

摘要

A seal-less centrifugal pump (1) which does not require a shaft seal mechanism and has no leakage. The seal-less centrifugal pump (1) comprises a casing (10) which forms a pump chamber (12) provided with an inlet (11) and an outlet for liquid, an impeller (30) which is disposed within the pump chamber (12) and is rotatably supported by a pivot bearing (20), and a magnetic coupling device (40) which is configured so as to include driven permanent magnets (41) incorporated in the impeller (30) and also include driving magnets (42) for rotationally driving the driven permanent magnets (41) with a partition wall therebetween. The impeller (30) which is supported in the rotation axis direction relative to the casing (10) is driven by the magnetic coupling device (40), and pressure is applied to liquid, which is introduced through the inlet (11) from the rotation axis direction, to deliver the liquid in the radial direction from the outlet. The magnetic coupling device (40) is disposed on a line tilted to the inlet (11) side from the rotation surface of the impeller toward the rotation axis center.