Abstract: The consistency of the production quality of the parallel flow heat exchanger has a significant impact on the heat exchange performance of the air conditioner. The welding quality of the spacer of the parallel flow heat exchanger directly affects the performance of the heat exchanger, but there is little relevant literature to study it. Through the test and analysis of a set of abnormal cases of the refrigeration performance of the air conditioner, it is confirmed that the poor welding of the spacer of the parallel flow condenser leads to the abnormal refrigeration performance, It is suggested that the deformation caused by the processing and stamping of the collector should be considered when designing the spacer, and propose that the spacer semicircle should be designed with multi segment arcs, which can reduce the gap between the spacer and the collector after assembly, so that the solder can evenly fill the gap during brazing, and in the final inspection stage of heat exchanger production. The inspection judgment parameters need to be compared with the qualified standard parts confirmed by the high-precision plugging inspection machine.

Key words: Parallel flow heat exchanger, Spacer, Collecting pipe, Welding, Performance, Analysis