Simple maintenance of cast aluminum electric heaters after moisture and leakage

During maintenance, some of the original sealing sealant can be removed first, leaving a space for repairing the sealing. Then, power on the cast aluminum heater for more than 10 minutes to allow the moisture inside the cast aluminum heater to fully evaporate. After Free cooling, check with a megger. The insulation resistance between the shell and the lead out rod of the heating wire is not less than 1, indicating that the insulation is good. If it is less than 1, you can turn on the power for a while longer to let the moisture inside the tube evaporate.
When the insulation of the cast aluminum heater is measured to be good, the tube can be sealed with silicone rubber. Note that the electric heating wire lead out rod should be kept in the center position of the tube. After 24 hours of curing of silicone rubber, it can be reused.
For the cast aluminum electric heater, the test is divided into two stages. Taking the sodium cast aluminum heater as an example: 1. Start and preliminary operation of the cast aluminum heater
The purpose of this experiment is to observe whether the cast aluminum heater can operate normally. At the beginning of the experiment, one end of the heat pipe is heated in a tubular resistance furnace. The initial heating rate of the cast aluminum heater during start-up is slow, causing the sodium in the capillary structure to melt and reflux to supplement, avoiding the evaporation section from drying out. After about half an hour of startup, the cast aluminum heater enters normal operation, and then gradually heats up to about 700C. At this time, the part of the cast aluminum heater outside the furnace turns red due to a large amount of heat being exported. 2. After the normal operation of the cast aluminum heater, the measurement of the axial wall temperature distribution and the measurement of the transmitted power of the cast aluminum heater.
During the experiment, the cast aluminum heater was directly exposed to the air outside the high-frequency coil, and the axial wall temperature distribution was tested under different power levels through high-temperature radiation and natural convection heat dissipation of the air.
Adjust the ratio of helium to air in the air gap to increase or decrease the amount of helium. Measure the maximum transmitted power of the cast aluminum heater at different operating temperatures by adjusting the input power every time.