Double pipe for double pipe heat exchanger for motor vehicle engine, has recesses and projections that are formed in outer pipe wall and inner pipe wall respectively and are radially inserted into annular gap

摘要

The double pipe (1) has an outer pipe (2) with an outer pipe wall (6). An inner pipe (3) is coaxially arranged inside of the outer pipe and provided with inner pipe wall (16). An annular gap (5) with two annular gap ends (30) is formed between the outer pipe and the inner pipe. The recesses (9) and projections are formed in outer pipe wall and inner pipe wall respectively and are radially inserted into the annular gap. An independent claim is included for double pipe heat exchanger.