Parallel flow aluminum tubes (also known as "aluminum
alloy porous aluminum micro
channel tubes") is a kind of thin-walled porous flat
tube material, which is mainly used to make parallel flow heat exchanger (also
known as "microchannel heat exchanger" or "parallel flow
microchannel heat exchanger") in various new environmental protection
refrigerant air conditioning systems, It is a new type of environmental
protection refrigerant bearing pipe material used in air conditioning system.
Firstly, it has mandatory use requirements in automobile air conditioning
system. At present, it also has certain application in the field of household
and commercial air conditioning.
According to various data, the parallel flow aluminum flat
tubes has high technical content and great production difficulties,
which are mainly reflected in the following aspects
1. Super large extrusion ratio: parallel flow aluminum flat
tube is one of the aluminum alloy tubes with the smallest
cross-section at present, with a cross-section area of about 0.16cm2. It must be
extruded once by hot extrusion, and the extrusion ratio should be more than 400
times. This brings about the technical problems of extrusion ratio, and has very
high technical requirements for process control, heating temperature difference,
mold feed port, material path, welding cavity, sizing belt design and working
process cooling. ? 2. Ultra high dimensional accuracy: the dimensional accuracy
of parallel flow aluminum flat tube is much higher than that of
conventional hot extrusion products. It is difficult for ordinary aluminum alloy
profile factories to meet this standard. ?
3. Air tightness: the parallel flow aluminum flat tube product
produced by a casting rod has a length of nearly 500 meters. In the process of
extrusion, it must be guaranteed that the production process is absolutely
stable and reliable. A small deviation in a good link will lead to defects in
the product.
4. Requirements for high quality casting bar: the wall thickness of the
parallel flow aluminum flat tube is only 0.16-0.35mm. If the
purity and hydrogen content of the casting bar fail to meet the requirements, as
long as there are tiny pores or impurities, the thin wall of the parallel flow
aluminum flat tube will leak.
5. Surface treatment requirements: due to the very precise requirements of
parallel flow aluminum flat tubes business trip, the
requirements for the bonding interface of zinc spraying layer on the surface are
very high, resulting in only a few companies' zinc spraying equipment can be
used for the zinc spraying operation of flat tube.
6 product quality requirements: due to the production difficulty, high technical
requirements and strict precision requirements, the flat tube production line
inevitably has a few defects and flaws. In order to ensure the quality of the
product, online inspection has become an important factor in controlling the
product quality. How to find the defects in the production line and detect the
defective products in time plays a key role in the normal operation of the
production process of parallel flow aluminum flat tubes.
Application :
Parallel flow aluminum tube is mainly used in automobile air
conditioning heat exchanger system
