Different-diameter pipe connection device and method for connecting different-diameter pipes

Abstract

A different-diameter pipeline connecting device comprises a pulp pipe and flange connecting pieces different from the pulp pipe in inner diameter. The different-diameter pipeline connecting device ischaracterized by further comprising a conical edge overturning pipe with one end provided with an overturned edge, loose flanges and connecting bolts, wherein the loose flanges and flanges of the flange connecting pieces are the same in standard; the end, without the overturned edge, of the conical edge overturning pipe is equal to the pulp pipe in inner diameter and is coaxially fixed to the pulppipe, and the end with the overturned edge is equal to the flange connecting pieces in inner diameter; and the loose flanges sleeve the conical edge overturning pipe and are matched with the overturned edge of the conical edge overturning pipe in an abutting manner, and the loose flanges and the flange connecting pieces are connected through the connecting bolts. According to the different-diameter pipeline connecting device, different-diameter pipelines are in smooth transition, the phenomenon of pulp hanging is avoided, the pulp pipe and the flange connecting pieces are detachably connected, and connecting and dismounting are quite convenient; and the axial alignment metric of the different-diameter pipeline connecting position is improved, the pulp flowing efficiency is prevented frombeing influenced by the phenomenon of misalignment, and pulp circulation stability at the different-diameter pipeline connecting position and the different-diameter pipeline connecting reliability areimproved. The invention further provides a different-diameter pipeline connecting method.

Description

technical field [0001] The invention relates to a connection device for pipes with different diameters, which is used for detachable connection between pipes with different diameters, and also relates to a connection method for pipes with different diameters. Background technique [0002] The connection between special paper pulping pipes and equipment, instruments or valves with different diameters can adopt mechanical joints that connect flanges with bolts, or use two grooved standard clamps with different diameters and one end larger than the other. Small grooved reducers to achieve variable diameter connections. [0003] Related prior art detected: [0004] 1. CN 101932866 A, loose-fitting flange-type trumpet pipe joint, which has: trumpet-shaped parts formed at the ends of two steel pipes and loose-fitting flanges respectively contacting the horn parts, and the end faces of the trumpet-shaped parts are opposite to each other. The angle θ with respect to the central ax...

AI Technical Summary

Problems solved by technology

[0008] 1. The two different-diameter pipes are not radially positioned, resulting in axial misalignment and misalignment. A step is generated at the joint of the different-diameter pipes, which affects the circulation efficiency of the slurry at the joint, and it is easy to form slurry, so that the slurry stranded

[0009] 2. The transition of the joint of the reducer is not smooth, which affects the slurry passing efficiency and appearance quality

[0010] 3. The flange is directly welded to the reducer and cannot be disassembled. It is difficult to install and repair the connection of the reducer

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