Manufacturing method of coiled pipe heat exchanger core

Abstract

The invention discloses a manufacturing method of a coiled pipe heat exchanger core. The manufacturing method comprises the following steps that coiled pipes, an upper plate, a cover plate, an oil collecting plate and a plurality of partition plates are machined respectively, and lap joints are machined on the upper plate and the cover plate; an assembly tool with a guide cone is inserted into an opening in the upper end of each coiled pipe, a lower plate and the plurality of partition plates penetrate through the guide cones to be assembled on the coiled pipes under the guidance of the assembly tools, and the positions between the lower plate and the partition plates are positioned through positioning tools; the to-be-brazed positions of the coiled pipes and the upper plate are coated with brazing filler metal; the cover plate is assembled on the upper plate, the oil collecting plate and connectors are welded into an oil collecting plate assembly, and the oil collecting plate assembly is assembled on the coiled pipes through the assembly tools; the to-be-brazed positions of the coiled pipes and the oil collecting plate assembly are coated with brazing filler metal; and brazing tools are additionally arranged on the periphery of a heat exchanger core body assembly, and the heat exchanger core body is placed in a vacuum brazing furnace to be subjected to vacuum brazing. According to the manufacturing method, by designing the assembly tools, the positioning tools and the brazing tools, the manufacturing difficulty is overcome, and the machining difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of aerospace precision manufacturing, and relates to a method for manufacturing a serpentine tube heat exchanger core. Background technique [0002] The schematic diagram of the core body of the engine serpentine heat exchanger is as follows: figure 1 , figure 2 and image 3 As shown, the engine serpentine heat exchanger core is composed of a lower plate, a partition, a serpentine tube, an upper plate, a cover plate, a joint, and an oil collecting plate. The material of the engine serpentine heat exchanger core is Austenitic Body stainless steel. Vacuum brazing and argon arc welding are used to form chambers A and B between the parts, and the medium circulates in the chambers A and B to cool the high-temperature gas entering between the partitions. Since there are 2400 serpentine tubes in the core of the heat exchanger, the diameter of the serpentine tubes is 2.2mm, and the fitting gap between the serpe...

AI Technical Summary

Problems solved by technology

Since there are 2400 serpentine tubes in the core of the heat exchanger, the diameter of the serpentine tubes is 2.2mm, and the fitting gap between the serpentine tubes and the upper plate, lower plate, and partition is very small, and the overall assembly is extremely difficult; The thickness is only 1mm, and the partitions are easily deformed when high-temperature gas passes through the channels between the partitions, which undoubtedly increases the difficulty of assembly

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