The micro-channel aluminum flat tube is a new type of environmentally friendly refrigerant carrier pipeline assembly. It was first mandatory for automotive air conditioning systems (European Regulations 1996, Chinese Regulations 2002). Due to the high technical content, the production of this product is extremely difficult. Due to the high technical content of the microchannel aluminum flat tube, the production is extremely difficult. The minimum variety is 12mm in width and 1mm in thickness, but requires 12-16 holes. The difficulties are mainly reflected in the following three aspects:
1. Extra large extrusion ratio
The extrusion ratio refers to the ratio of the cross-sectional area of the material before hot extrusion to the cross-sectional area after extrusion. -Generally it is 8-50 times, and the cross-sectional area of the microchannel aluminum flat tube is only about 4px2. Up to 400 times
Above, it is more than 8 times the limit of aluminum extrusion process.
2. Super high
The dimensional accuracy of the micro-channel aluminum flat tube is much higher than the national standard of "Hot Extruded Tube for Research on Aluminum and Aluminum Alloys". According to national standards, the width dimension deviation of 16mm typical varieties
It is +0.3mm, the width dimension deviation of Acer microchannel aluminum flat tube is +0.03mm, even if the requirement is high, it must be increased to +0.01 ~ +002mm.
3. Air tightness
A set of microchannel heat exchanger has about 50 to 150 microchannel aluminum flat tubes. As long as there is one air tightness defect (such as air holes, inclusions, etc.), the entire air conditioner will be scrapped, so the quality
The standard is PPM (Million Pieces), and the measurement standard is below 15PPM.
