VERTICAL PIPE WITH SPIRAL GUIDE ROUTE

摘要

PROBLEM TO BE SOLVED: To provide a vertical pipe with a spiral guide route having a large damping effect of drainage. SOLUTION: This vertical pipe has an inner surface spiral guide route in a straight vertical pipe main body, and recessed grooves 114 and 133, projection lines or steps are provided along the axial direction, in the sections provided with the spiral guide route on the inner surfaces of vertical main bodies 111 and 131.