spiral casing [机] 蜗壳 ; 蜗形壳 ; 螺形
spiral welded casing 螺旋焊接套管
concrete spiral casing 混凝土蜗壳
nose angle of spiral casing 涡壳的包角
spiral casing embedded forme 蜗壳埋设方式
reinforced concrete spiral casing 钢筋混凝土蜗壳
nose of spiral casing 涡壳尾端 ; 涡壳鼻端
There exists a spiral clearance space in the API round thread casing joint which is effected by the thread tolerance ranges.
API套管圆螺纹自身存在牙间间隙，并形成螺旋状空间间隙带。
This paper summarizes soft development and technology of spreading of elliptical spiral casing based on approximate elliptical spiral casing (major and small circle casing).
主要介绍椭圆蜗壳按近似椭圆蜗壳(即大小圆蜗壳)展开的软件开发与制作工艺过程。
Different geometry of stay vanes applied to reduce loss is discussed in the paper, so as to compensate lack of spiral casing and improve hydraulic efficiency.
本文探讨了通过沿圆周分布不同形状的固定导叶来降低损失，以克服此种蜗壳自身的不足，提高转轮的水力效率。
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