水轮机蜗壳的结构设计问题探究

Exploration of the Structure Design of Hydroturbine Spiral Casing

我国近年来引进的机组其蜗壳焊接后多数要在工地进行蜗壳的水压试验,水压试验尽管可以消除部分残余应力,但量值有限,又因蜗壳的设计应力不大、设计技术比较成熟、焊接和制造工艺稳定,而且有有效的检测手段和经验,所以我国水电站的蜗壳可不要求做工地水压试验。

In recent years, China＇s spiral casing imported machines need to go through the hygro pressure test. Although the hygro pressure test could eliminate partial residual stress, the quantity is limited. And the design stress of spiral casing is not big and the design technology is mature, the welding and manufacture process are stable. And there are effective testing methods and experience, so China＇s hydroturhine spiral casing could be free from site hydro pressure tests.