Why does a vacuum drying oven need to be vacuumed first and then heated up?

Why does a vacuum drying oven need to be vacuumed first and then heated up?

1. For example, if you follow the procedure of heating the box first and then vacuuming it, the heated air will be pumped out by the vacuum pump, and the heat will inevitably pass through the vacuum pump,

As a result, the temperature rise of the vacuum pump may be too high, which may lead to a decrease in the efficiency of the vacuum pump or damage to its components.

2. The heated gas is directed to 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

Generate indication error on the vacuum pressure gauge.

3. The correct way to use it is to first vacuum and then heat it up. After reaching the rated temperature, if it is found that the vacuum degree has decreased, it should be added appropriately. Doing so is beneficial for

Extending the lifespan of equipment is beneficial.

4. The material is placed in a vacuum box to evacuate the gas components that can be extracted from the workpiece material. If the workpiece is heated first, the gas will expand when it encounters heat. Due to vacuum

The sealing of the box is very good, and the enormous pressure generated by the expanding gas may cause the tempered glass of the observation window to burst. This is a potential danger. Press to vacuum first and then raise again

The program operation of warm heating can avoid this danger and avoid using vacuum before heating. We can install a thermal expansion protection system on the equipment, which can be achieved by

The vacuum gauge detects the pressure inside the box, and excess pressure can be discharged through an electromagnetic valve.

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