Runner for a pump

Fluid reaction surfaces (i.e. – impellers) – Support mounting – carrier or fairing structure

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Details

416213A, 4151701, 415175, 415177, 4152161, F04D 2958

Patent

active

052288366

ABSTRACT:
The runner for pumping hot reactor liquids includes a runner body which is connected with a shaft portion which transmits a driving torque. An annular insert is disposed between a bearing sleeve projecting from the runner body and the drive shaft portion to define an annular flow path in order to guide an auxiliary flow which, in the case of an injection operation, leads cool reactor liquid to the runner in one direction of flow and, in the case of a leakage operation, leads hot reactor liquid for cooling away from the runner in an opposite direction of flow. A closed cavity is formed between the runner body and the drive shaft portion in a transition zone between the two components so as to reduce the cross-sectional area for the transfer of heat between the runner body and the drive shaft portion. The cavity is formed by a blind bore which has a diameter greater than 30% of the outer diameter of the shaft portion. The closed cavity may be evacuated or filled with a material which is a poor conductor of heat. In addition, a protective sleeve may be disposed over the region of transition between the runner body and the shaft portion.

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patent: 4997341 (1991-03-01), Lorett
"Nuclear Fluid-Handling Equipment," Power, May 1974, William O'Keefe, 2 pages.
"Monitoring for Shaft Cracks on Reactor Recirculation Pumps," Sound and Vibration, May 1989, Koval and O'Brien, Jr. p. 12.
Patent Abstracts of Japan, vol. II, No. 352.

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