The molding technology and performance characteristics of PVC - U pipes with foaming core and spiral inner wall used in the building drainage and sewage systems are introduced.
介绍了具有芯层发泡和内壁螺旋结构的用于建筑排水的硬聚氯乙烯(PVC-U)管材及配件的成型加工技术和性能特点。
Perturbation to the heat transfer problem in a helical tube wall;
螺旋管壁热传导问题的摄动解
In this paper,the forming process of the thin walled helical tubes is analyzed.
分析了薄壁螺旋管的成型过程 ,阐述其自动成型机的原理及结构。
Installation method of spiral water wall for HG-1900/25.4-YM3 type supercritical once-through boiler;
HG-1900/25.4-YM3型超临界直流锅炉螺旋水冷壁安装方法
A new technology is applied for installation of boiler spiral water walls with erection of suspending circle construction platform.
安装锅炉螺旋水冷壁时,采用新工艺,设置了悬吊环形施工平台,采用地面预组、空中分层找正和定位的施工方法,攻克了管圈易整体扭转、管屏经密封焊后极易变形的难题。