| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump structure capable of efficiently dissipating a frictional heat generated due to a back thrust caused during abnormal operation in a magnet pump where a shaft forming the rotating center of a driven rotating body is supported on both sides thereof. SOLUTION: A shaft 9 inserted into a cylindrical bearing 13 installed on the axis of a driven rotating body 6 including an impeller 5 is supported on both sides by a rear casing 2 and a front casing 8, a stepped shoulder 9a is formed on the shaft, and a back thrust bearing 12 is disposed on the rear surface of the impeller so as to oppose to the shoulder 9a so that the back thrust bearing is slid on the shoulder of the shaft when the impeller lowers to the rear casing side while rotating during abnormal operation. In addition, a liquid flow path is formed in the sliding surface of or inside the back thrust bearing 12.
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