Briefly describevacuum drying ovenWhy is it necessary to first evacuate and then heat up the explosion, instead of heating up and then evacuating?

1) The purpose of placing the workpiece in a vacuum box for vacuuming is to remove any gas components that can be extracted from the material of the workpiece. If the workpiece is heated first, the gas will expand when exposed to heat. Due to the excellent sealing of the vacuum box, the enormous pressure generated by the expanding gas may cause the tempered glass of the observation window to burst. This is a potential danger. By following the procedure of vacuuming first and then heating up, this danger can be avoided.

2) If the procedure of heating up first and then vacuuming is followed, when the heated air is pumped out by the vacuum pump, the heat will inevitably be carried to the vacuum pump, resulting in a high temperature rise of the vacuum pump and a possible decrease in its efficiency.

3) The heated gas is directed towards the vacuum pressure gauge, which will generate a temperature rise. If the temperature rise exceeds the specified operating temperature range of the vacuum pressure gauge, it may cause indication errors in the vacuum pressure gauge.

The correct usage method should first evacuate and then heat up. When the rated temperature is reached and the vacuum degree is found to have decreased, add some more suction appropriately. This is beneficial for extending the service life of the equipment.