Abstract: To ensure the safety work of the bearings, the radiators were generally installed on the shafts between the circulating cooling water pump chambers and the bearings, which might reduce the working temperatures of the bearings. A heat calculation model of the shaft-radiator-bearing system was established using connected heat equilibrium calculation method herein. The heat equilibrium calculation on the shaft-bearing-radiator system was proceeded by home-made calculating program with VC language, and the temperature distribution along the axis was obtained. The influences of the radiator construction on the bearing's operating temperature were analyzed. The calculating results show that, the heat transfer of the shaft-bearing-radiator system is affected greatly as the radiator setting on the shaft, and the reduction of bearing temperatures is only slightly. Other cooling methods should be adopted such as forced-air cooling mode to increase the heat transfer ability of the bearing bracket and further reduce the temperature at the bearing and increase the reliability of the pump.

Key words: pump, shaft-radiator-bearing system, heat equilibrium model, temperature distribution

摘要： 为保证核泵轴承安全可靠地工作，泵转子与轴承之间的转轴上设置有散热器，以降低轴承的工作温度。采用局部热平衡计算方法，建立了核泵轴-散热器-轴承系统的热计算模型。采用VC语言编制了计算程序，对轴-散热器-轴承系统进行了热平衡计算，获得了温度沿转轴的分布，分析了散热器结构对轴承工作温度的影响。计算结果表明，在轴-散热器-轴承系统中，散热器对轴向传热量影响较大，但设置轴上的散热器对轴承工作区温度下降不显著。为更大程度地降低轴承工作温度、提高可靠性，还需要强化电机支架的换热能力，通过强制风冷来实现降温。

关键词: 泵, 轴-散热器-轴承系统, 热平衡模型, 温度分布