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Q

Sealant shrinkage occurs in low temperature of potting adhesive

a
Peer products, potting glue, after a period of time in the use of potting glue in the low temperature -40 ℃, the phenomenon of glue shrinkage, cracking and leakage. Low temperature appear sealant shrinkage, cracking cause analysis. It means that the adhesion of potting adhesive at low temperature -40 is not strong, and the phenomenon of adhesive shrinkage, cracking and leakage. Due to the formula design, product structure design, potting process and other factors, in the curing process will produce a large internal stress, in the role of internal stress, potting glue in different degrees of defects and fine crack expansion caused by cracking, so the existence of internal stress is the root cause of potting material cracking. Improvement measures. In response to this phenomenon, our company adopts self-developed PU30X-3 polyurethane potting adhesive, which has high insulation strength, hot and cold resistance, oil resistance, strong adhesion ability, etc. The same type of oil pump is loaded and operated for more than 1000 units, and there is no cracking of the potting adhesive.
Q

Bearing noise

a
Oil pump after a long period of operation, the noise value becomes large or heterodyne, after disassembly, the bearing raceway was found to have "electric corrosion" pattern. Analysis of the reasons for the appearance of oil pump bearing heterodyne. Because the electromagnetic coil is not corona electromagnetic wire, after long operation of the oil pump, capacitive discharge, thus causing corrosion and damage to the surface of the coil and the bearing sound (bearing raceway has "electric corrosion" pattern). Improvement measures. Ltd. Q(ZX/XY)BP-3/200PW 0.75mm anti-corona enameled wire for frequency conversion motor, which has the advantages of corona resistance, oil resistance, insulation resistance, frequency fluctuation resistance, etc. The temperature resistance level can reach 200℃, which can ensure the normal operation of the oil pump.
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