Currently,the domestic usage of waterproof connection,such as the trapezoid wreath hoop connection,the built-in cuneiform wreath hoop connection and screw connection of small thread pitch are all with some shortages such as high cost,low connecting efficiency and more screwed circles in some extents.
目前,国内通常使用的水密联结接口如：梯形状环箍联结接口、嵌入式楔形环箍联结接口及小螺距螺纹联结接口等都不同程度的存在制造成本高、对接效率低及旋合圈数多等不足。
