vacuum oiling equipment of maintenance method

There are two kinds of resins commonly used on the transformer: epoxy resin and unsaturated resin. Unsaturated resin is cheap, can be cured at room temperature, casting process is simple, but its electrical and mechanical strength is low, heat resistance is poor; In addition, the saturated vapor pressure of unsaturated resin is high, the mixing glue is not suitable for vacuum degassing, and it is also not suitable for vacuum pumping during pouring, there are bubbles in the pouring body; The curing shrinkage of unsaturated resin is large, and it is easy to crack when the mixture is cured. Therefore, unsaturated resin is only suitable for low voltage products. The curing shrinkage of epoxy resin is small, the saturated steam is low, suitable for casting under high temperature, high vacuum, so that the mixed glue has better fluidity, can maximize the degassing, so as to obtain an ideal casting body.

Maintenance should pay attention to several links, disassembly, cleaning, inspection, assembly. It is very important that vacuum equipment, no matter its size, belong to precision mechanical equipment. Disassembly should follow the principle of light handling light handling, can not do, must not use sledgehammer to knock; Cleaning parts should be clean and thorough, in order to find problems and hidden dangers; Vacuum pump products and general mechanical products have a greater difference, general mechanical products more than blanking chamfering, and vacuum pump blanking horn clear, very easy to hurt the hand, should be more careful, remember. Inspection is a meticulous work, every detail do not drop, more can not exist fluke psychology. There is a equipment, the user has stored for 4 years, finished the routine cleaning work to connect the pipeline step by step began to vacuum, how can not meet the factory standard, what has been checked, is a gas supply of vacuum hose did not check, it was thought that the vacuum hose will not leak. Instead, the problem was this vacuum hose. Again, whether with gasoline or other solvents cleaning vacuum pump parts, must wait until the gasoline or solvent completely evaporated before assembly, vacuum pump oil if mixed with other oil or solvent, or water will destroy its performance, affecting the performance of the vacuum pump indicators. Rubber ring to clean, carefully check for any defects, such as cracks. Whether the size is correct or not, pay special attention to the similar size diameter, such as 3.1mm and 3mm; The incorrect size of 5.7 mm and 6 mm will affect the seal. Always has the heating position aprons, each disassembly cleaning must change, such as the oil booster pump each interface. Pump parts also need to be handled gently when assembling; When tightening the screw, the force should be even, and it should be tightened from the opposite Angle.