Inner pipe shallow hole welding assembly device of jacket heat exchanger jacketed pipe, jacket heat exchanger and welding method of jacketed pipe

Abstract

The invention discloses an inner pipe shallow hole welding assembly device of a jacket heat exchanger jacketed pipe, a jacket heat exchanger and a welding method of the jacketed pipe. The assembly device is used for seamless assembly between an inner pipe of the jacketed pipe and connecting grooves of end connecting pieces of the jacketed pipe and structurally comprises a claw type locator, a rotating pull rod, a lock nut and a beating handle. One end of the rotating pull rod penetrates the center axis of the claw type locator and is fixedly connected through a bolt and a nut. The beating handle is arranged at the other end of the rotating pull rod and limited through the lock nut. The assembly device is used on the inner pipe of the straight jacketed pipe and the inner sides of the grooves of the connecting pieces, and the problem of the eccentric misalignment of a pipe fitting during assembly of the inner pipe and the grooves is solved through assembly and spot welding of the assembly device. The concentricity of the inner pipe and the grooves is controlled by controlling the linearity deviation of the locator, and the wrong variable of the inner pipe and the grooves is controlled by controlling the outer diameter deviation of the locator. The assembly device is of a detachable structure and is simple and easy to detach. The assembly device can be recycled, and the assembly device is suitable for sleeve type equipment with inner pipes of the same type.

Description

technical field [0001] The invention relates to the combination technology of the inner tubes of various jacketed straight tubes in the petrochemical equipment located at a relatively shallow position inside, in particular to the inner tube shallow hole welded coupler of the jacketed tube of the jacketed heat exchanger, the jacket replacement Welding methods for heaters and jacketed pipes. technical background [0002] Quenching heat exchanger is a key equipment with strong processability in ethylene cracking unit. In terms of technology, cracking gas quenching heat exchangers are mainly divided into primary quenching heat exchangers and secondary quenching heat exchangers, and sometimes three-stage quenching heat exchangers are used for gas raw materials. [0003] The casing type quenching heat exchanger is usually composed of multiple casings composed of inner and outer tubes arranged in a row, and each casing is connected to the upper and lower headers by upper and lower...

AI Technical Summary

Problems solved by technology

[0004] However, the quality of the weld is inseparable from the assembly and welding, especially when the inner U groove is used for inner hole welding, because the manufacturing technical requirements of the weld according to the product design are that after the inner and outer pipes are passed through the pipe, The outer sleeve is welded first, and then the inner sleeve is pair-welded. It belongs to the sleeve closing seam, so the weld seam cannot be seen directly from the outside, and can only be observed through the limited sight distance at the end. The inner tube and the connector are assembled. The concentricity and misalignment directly affect the welding quality, which is a very important part in the manufacturing process of the tube-type quenching heat exchanger.

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