Due to the high technical content of Acer micro channel aluminum flat tube, the production is extremely difficult, the minimum variety width is 12mm, the thickness is only 1mm, but there should be 12-16 holes.The difficulties are mainly reflected in the following six aspects:
1. Extra large extrusion ratio
The extrusion ratio refers to the ratio between the sectional area before hot extrusion and the sectional area after extrusion, which is generally 8 ~ 50 times, while the sectional area of the Acer micro channel aluminum flat tube is only about 4px2, and the extrusion ratio should reach more than 400 times, which is more than 8 times of the limit process of aluminum extrusion.
2. Ultra-high dimensional accuracy
The dimensional accuracy of Acer micro channel aluminum flat tube is far higher than the national standard.According to the national standard, the typical variety width 16mm size deviation is ±0.3mm, and the micro channel aluminum tube width size deviation is ±0.03mm, the high requirements even need to improve to ±0.01 ~ ±0.02mm.
3. The air tightness
A set of micro channel heat exchanger has about 50 ~ 150 Acer micro channel aluminum flat tube, as long as one air tightness defects (such as pores, inclusion, etc.), the whole air conditioner will be scrapped, so the quality standard to PPM (1 million) meter, the measurement standard is below 15PPM.
4. High quality bar
The minimum limit wall thickness of the Acer micro channel aluminum flat tube is only 0.13mm. If the purity and hydrogen content of the casting rod material do not meet the requirements, as long as there is a very small porosity or inclusion, the thin wall of the Acer micro channel aluminum flat tube will leak, so the high purity refining rod must be used, the hydrogen content is less than 0.09%.
5. Zinc spray on the surface
Because there is refrigerant medium in the Acer micro channel aluminum flat tube and atmospheric corrosion outside, it is easy to leak due to pitting corrosion. A thin layer of zinc must be sprayed on the outer surface of the micro-channel aluminum tube to protect the wall from corrosion.So far, there is no qualified zinc spraying equipment manufacturer in China, and only a very few manufacturers in the world can provide it.
6. On-line flaw detection and testing technology
Due to the difficulty and difficulty of Acer micro channel aluminum flat tube technology, how to use scientific and effective online flaw detection, surface quality and other detection means in the production process to timely detect (mark) defective products is very critical to the quality control of Acer micro channel aluminum flat tube.
