The reason why the vacuum degree in the vacuum oven cannot reach the set value and the influence of wrong operation on the experiment
Release time:
2020-04-03 15:57
Source:
The reason why the vacuum degree in the vacuum oven cannot reach the set value:
1. Check whether the exhaust safety valve of the low pressure cylinder of the vacuum oven is complete and there is no suction;
2. Check whether the vacuum break door has been closed or leaked;
3. Check whether the steam side water discharge valve of the condenser is closed and does not leak;
4. Check whether the water level gauge of the vacuum system of the vacuum oven is broken or leaked;
5. Check whether there is air leakage at the place where the vacuum extraction pipe and the cylinder are connected. Here, the air leakage decreases when the load decreases, and the vacuum rises slightly after the load increases.
How does the wrong operation of the vacuum oven affect the experiment?
1. If you operate according to the procedure of first heating and then vacuuming, when the heated air is drawn by the vacuum pump, the heat will inevitably be brought to the vacuum pump, which will cause the vacuum pump temperature to rise too high, which may reduce the efficiency of the vacuum pump.
Second, the heated gas is directed to the vacuum pressure gauge, and the vacuum pressure gauge will generate a temperature rise.
If the temperature rise exceeds the operating temperature range specified by the vacuum pressure gauge, it may cause a value error in the vacuum pressure gauge.
3. The workpiece is placed in a vacuum drying oven for evacuation to remove the gas components that can be extracted from the material of the workpiece.
If the heating works first, the gas will expand when heated. Due to the excellent sealing of the vacuum drying oven, the huge pressure generated by the expanding gas may burst the observation window tempered glass. This is a potential danger.
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