Pipe orifice connecting structure

The utility model discloses a pipe orifice connecting structure and belongs to the technical field of pipe connecting fasteners. The first technical scheme includes that the pipe orifice connecting structure comprises a flanged pipe fitting, a bush, a cone mouth pipe body and a tightening flange. The outer diameter of one end of the bush is provided with a conical surface. The structure of the tightening flange includes that a flange is connected with a cone matched with the conical surface of the bush, the fastening flange is arranged outside a cone mouth of the cone mouth pipe body in a sleeve mode, and the cone mouth of the cone mouth pipe body is located between the bush and the fastening flange and connected with the bush and the fastening flange in a seal mode. The other end face of the bush is connected with a flange end face of the flanged pipe fitting in a seal mode. The tightening flange is connected with the flange of the flanged pipe fitting in a fastened mode. The differences of the second technical scheme includes the outer diameters of the two ends of the bushes are provided with conical surfaces, the bushes are located inside cone mouths of two opposite cone mouth pipe bodies, the number of the fastening flange is two and the fastening flanges are oppositely arranged outside the cone mouths of the two cone mouth pipe bodies in a sleeve mode, and the two fastening flanges are connected with each other in a fastened mode. The pipe is firm in connection, good in seal performance, convenient to mount and dismount, and easy to popularize.