Air conditioning copper tube leakage belongs to the fatal defect of air conditioning refrigeration copper tube, once the leakage phenomenon occurs, the refrigerant will all overflow from the refrigeration copper tube, and the operation of the air conditioning system will be stopped due to the lack of propagation medium.
1, air conditioning copper tube leakage causes from two aspects:
① manufacturing factors;
② user use factors.
③ end-customer factors
2, air-conditioning copper pipe manufacturing reasons
① Eddy current flaw leakage.
GB specifies that the copper tube must be 100% eddy current flaw detection, and specifies the diameter of artificial defects (through holes) on the sample tube used to calibrate the flaw detector in order to ensure the sensitivity of eddy current flaw detection, to prevent the leakage of defects exceeding the standard.
This requirement, in the regular large air-conditioning copper tube suppliers are able to fully guarantee, because the flaw detection is online, this online eddy current flaw detection to ensure that all lengths of the tube are eddy current detection, is 100% of the flaw detection.
Some copper tube factories are not so, or do not undergo eddy current testing, or use a low standard eddy current detector sampling. So that there are excessive defects in the copper pipe leakage or non-detection, resulting in users using the air conditioning leakage.
② Eddy current flaw detection defects, but the surface of the copper tube is not marked or marked inaccurate and unclear.
In the production process of copper pipe, eddy current flaw detection of defects required to be covered with ink on the defects exceeding the standard, so that in the process of using the user can be defective copper pipe removed.
However, due to the manufacturer in the production process to choose the ink adhesion is not enough, inkjet gun adjustment is not appropriate, drying is not complete, the composition of the ink meets the high temperature discoloration and other reasons, resulting in the use of users in the process of eddy current flaw detection defects can not be singled out, once defective air-conditioning copper tubing in the air-conditioning unit will inevitably lead to leakage.
3, air-conditioning copper tube users use the reasons
Users use copper pipe to make two ware process: cutting - bending - expansion - cleaning - welding - test pressure.
① Misuse of eddy current flaw detection of defects in the pipe.
In the normal production of copper pipe conditions, copper pipe eddy current flaw detection not only marked the number of injuries on each coil, and will be coated with black marks on the injury site, so that users can identify the use of this "black pipe".
Air-conditioning and refrigeration enterprises should be clear to the operators, especially the new workers, in order to prevent this kind of tube with injuries installed on the air-conditioning and refrigeration units.
②Processing problems.
Air conditioning in the process of forming two devices in the process of bending, expanding, flaring, welding and so on.
In the process of bending due to the bending part to go through a local force, resulting in local overstretching, the formation of cracks, dark cracks and other issues, once the refrigerant charge, often refrigerant leakage occurs here.
Air conditioning copper tube through the fins, to expand the tube in the expansion machine, expansion machine is divided into vertical and horizontal two kinds of vertical expansion machine is mainly up the length of the two relatively small, high efficiency; horizontal expansion machine is mainly expanding the length of the two longer, lower efficiency.
In the process of expanding the tube, due to the core is through the copper tube with the inner diameter of the copper tube interference to the size of the copper tube, so that the outer diameter of the copper tube and aluminum foil heat sink full contact. Expansion of the process is very easy to rise head scratches the copper tube, the formation of penetrating injuries caused by the leakage of copper tubes; sometimes due to the aluminum foil bore burrs are too large, in the expansion of the burrs penetrate the copper tube caused by leakage.
Leakage caused by poor welding.
Copper tube in the wear into the aluminum foil with holes, the tube and the tube to be linked up, you need to use a small elbow connection, in order to link up firmly, in the production process, with the solder will be a small elbow with the copper pipe welded together;
Welding method is divided into manual and automatic two kinds of welding, welding due to the quality of solder, copper pipe flaring, welding surface with foreign objects and other reasons, resulting in welding is not solid, the formation of false welding, resulting in refrigerant leakage.
3、The reasons for the use of end-customers
End-customer air-conditioning use environment, resulting in the copper tube in the high temperature and high humidity or acidic environment for a long time, resulting in gradual corrosion of the surface of the copper tube, the appearance of similar ants on the body of the copper tube like multi-branch leakage cellular leakage points, known as "anthill corrosion". Severe corrosion of the copper pipe in the state of extrusion by external forces in the form of lumps or particles.
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