How to solve freeze dryer low vacuum degree

The vacuum freeze dryer is a low-temperature freeze-drying method. Its principle is to freeze the water-containing substance into a solid state first, and then sublimate the water in it from the solid state into a gaseous state, thereby removing the water and preserving the substance.

Causes for low vacuum degree of freeze dryer:

1. The pump temperature is too high, which may be caused by scratches and wear of the valve plate or inner cavity of the pump, and displacement of the rotor axis causing single-sided wear.

2. There is a problem with the pump oil:

① The oil level is too low and the seal is not tight;

② The oil is contaminated and is milky yellow;

③ The oil level is normal, but the oil circuit is blocked, and the pump cavity does not maintain an appropriate amount of oil.

3. The pump itself leaks: the sealing ring and gas ballast valve gasket are damaged or not tightened, and the exhaust valve plate is damaged, resulting in poor sealing.

4. The air inlet filter is blocked.

Troubleshooting methods for low vacuum degree of freeze drying machine:

1. Reassemble after repair.

2. Add oil; change oil; check the oil inlet of oil circuit and oil valve.

3. Replace the sealing ring or valve plate according to the specific situation.

4. Remove and clean.