Bell mouth structure of ductile cast-iron pipe

TLDR: In this article, a check ring is arranged inside the bell mouth end of a ductile cast-iron pipe and an external circular arc transits in a smooth manner, and the diameter of the pipe body is increased gradually.

Abstract: The utility model relates to a bell mouth structure of a ductile cast-iron pipe with DN1800mm, wherein, the bell mouth structure comprises a bell mouth of the ductile cast-iron pipe and a rubber ring; the external diameter of a pipe body of the ductile cast-iron pipe is DN1800mm, a check ring is arranged inside the bell mouth end of the pipe body, and an external circular arc transits in a smooth manner; a first groove, a second groove and a third groove which are formed towards to the inner part of a wall continuously are formed on an inner wall inside the check ring; the first groove, the second groove and the third groove are in the shape of steps; the diameters of the first groove, the second groove and the third groove are decreased gradually; the rubber ring which is embedded in the first groove and the second groove comprises a hard seat and a soft head; the rubber ring is provided with a horn-shaped inner hole; an outer bulge ring is arranged on the hard seat and embedded in the first groove; and the soft head is provided with an outer cylindrical surface which is embedded in the second groove. The bell mouth structure solves the technical difficult problem that the ductile cast-iron pipe with the caliber greater than DN1600 cannot adopt a T-shaped interface.