动压机械密封动力槽的优化及换热器面积的确定

针对高温、高压泵的机械密封端面容易出现磨损或烧损的问题，分析了热流体动压机械密封的工作原理；在高温、高压泵上采用了热流体动压机械密封，以及使用API682 32系统作为密封辅助冷却方案．对动压机械密封的端面动力槽作了优化设计；对密封系统的换热器进行了设计计算，使得密封能在较为理想的工作温度下工作．结果表明，在高温热水工况下，冲洗水流量及温度满足设计要求时，端面圆弧槽的密封效果最好，最大使用寿命可达8000h；液膜的承载能力随着密封端面圆弧槽槽数的增加而增加，受槽深的影响比较小；换热面积为0．50m^2的换热器是合理的，并应尽量使用较大换热面积的换热器，使进入密封腔的冲洗水温度低于100℃．

Dynamic groove optimization of hydrodynamic mechanical seals and determination of heat exchanger area

Considering the problem of easy wearing or burnout of mechanical seal end face for pumps operating at high temperature or pressure, the operating principle of hydrodynamic mechanical seal is described, and the scheme of adopting hot fluid hydrodynamic mechanical seals and API682 32 system as control the seal working temperature. The results show that when the flush flow rate and the temperature meet the design requirements, the seal end face with arc groove works best and its service life of the seal is up to 8 000 h ; the carrying capacity of the fluid film increases with increasing groove number. The heat exchanger with 0.50 m^2 heat transfer area is reasonable, and larger heat transfer area is recommended to ensure the temperature of flush water below 100 ℃.