Technological method for assembly and welding of diffuser tube in marine diesel engine

Abstract

The invention discloses a technological method for assembly and welding of a diffuser tube in a marine diesel engine. According to the technological method, the adaptation to the relative position between a top flange and a bottom flange can be achieved by replacing a tapered tube in the diffuser tube with a plurality of positioning ribs; on the one hand, the problem that the tapered tube is slowly delivered during the pre-assembly process can be solved and the normal assembly of a main machine can be guaranteed; on the other hand, the onsite assembly and welding of the diffuser tube can be changed into welding in a steel structure workshop through the use of the positioning ribs, the restrictions to the operation space and the operation position during the welding of the diffuser tube canbe changed, and the problem about large assembly and welding deformation can be solved; meanwhile, the process of flatness detection after welding is added in the technological method and the millingprocessing is achieved, so that the problem about assembly flatness errors can be solved; and an expansion joint is arranged on a turbocharger as well as the expansion and contraction quantity of theexpansion joint reaches 3 mm, so that the proper milling operation can be prevented from influencing the assembly.

Description

technical field [0001] The invention relates to the technical field of marine diesel engines, in particular to a process method for assembly welding of diffuser tubes in marine diesel engines. Background technique [0002] The diffuser pipe in the marine diesel engine is used to connect the scavenging box and the turbocharger. The diffuser pipe is mainly composed of three workpieces: top flange 01, cone pipe 02 and bottom flange 03. Its structure is as follows Figure 1-2 shown. Due to the cumulative error of the welding, processing and assembly of the scavenging box, etc., the diffuser tube needs to be welded on site when assembling, that is, the on-site welding step of the diffuser tube is in the pre-assembly process of the assembly, and the diffuser tube arrives Finally, after positioning each workpiece of the diffuser tube in the pre-installation process, the top flange 01, taper tube 02, and bottom flange 03 are welded on site in the pre-assembly process. [0003] Due ...

AI Technical Summary

Problems solved by technology

[0003] Due to the welding of the diffuser tube, the inner and outer sides of the two flanges need to be welded, and the welding site is limited by the working space and working position. After welding, the top flange and the bottom flange are easily deformed, so that the marine diesel engine When the whole machine is running, it is very easy to have an air leakage fault at the connection between the top flange 01 and the conical pipe 02 and the connection between the bottom flange 03 and the conical pipe 02. Air leakage will cause dust to be sucked into the turbocharger, thereby damaging the turbocharger. device

At the same time, because the conical tube 02 of the diffuser needs to be outsourced, it often occurs that the delivery is slow, which affects the assembly of the equipment

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