热水这种介质不同于冷水,密封难度很大,热水汽化会造成密封面液膜损伤甚至密封失效。以往的做法是用换热的方式降低密封液体的温度,因而增加了辅助设备和运行费用。本文介绍了“防护槽”机械密封的工作原理和在装置中一凝水泵(P-401)上的的应用,并与传统的机械密封做了对比。此类改造自身结构的密封将会得到广泛的应用。 This medium is different from cold water hot water, sealing a very difficult, hot water vaporization can cause seal surface liquid film damage or seal failure. In the past, heat transfer was used to lower the temperature of the sealed liquid, thereby increasing auxiliary equipment and running costs. This article describes the working principle of the “guard tank” mechanical seal and its application to a condensate pump (P-401) in the installation and compares it with a conventional mechanical seal. Such a modification of the structure of the seal will be widely used.