摘要
• 摘要: 高水头水泵水轮机进水球阀上下游主密封是影响机组安全稳定运行的重要部件之一，不同厂家对密封副硬度差的设计理念不同。探析了密封副设计理念的渊源，并对国内电站典型的设计方案的运行情况进行了探讨，重点研究了广蓄二期球阀密封副损伤情况与硬度差的关系。结果表明：密封面的损伤与其硬度差密切相关，固定密封环与活动密封环硬度接近时，密封面基本没有损伤或损伤程度很小；固定密封环硬度低于活动密封环硬度且差值比较大时，其密封面损伤的程度也相对较大。因此，合理控制球阀密封副硬度差有利于提高密封副的运行可靠性，建议设计制造厂家将硬度差控制在±35HB内。

   

  Abstract: Inlet valve's main sealingof High-head pump-turbine play important role on its stability during the operation process. Varies design ruleswas conducted to enhancethe characteristics of theHigh-head pump-turbineby considering the influence of inlet valve's main sealinghardness difference on its stability.In this paper, the evolution of design theory for sealing has been studied, and then several typical design methods used in China were investigated, and finally this study play insight into the influence of inlet valve's main sealinghardness difference on itsbehavior of GZ-IIpump-turbinewith the field test data analyzing. Based on the study of the field test data, several conclusions can be drawn as follows: (i)differential hardness has significant effect on the damage of sealing surface and the damage degree increases with the increasing of the differential hardness between fixed and dynamic sealing rings; (ii) the damage degree reach its minimum value when the dynamic and fixed sealing rings have the same hardness. Therefore, the optimized design rule that controlling the differential hardness below ±35HBwas proposed to enhance its behavior ofthe High-head pump-turbine.

   

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