Failure and maintenance method of vacuum system of lyophilizer in situ

In situ lyophilizers are used in medicine, pharmaceutical, biological research, chemical and food fields
.
Freeze-dried items are easy to store for a long time, and can be restored to the pre-freeze-dried state after adding water and retain their original biochemical properties
.
It has changed the cumbersome operation of the drying process in the past, prevented the pollution of the material, and realized the automation
of drying and sublimation.
The model has a programmable function, can remember the lyophilization curve, comes with a U disk extraction function, convenient for users to observe the lyophilization process
of materials.
Common faults and solutions of the vacuum system of the in-situ lyophilizer: 1: The performance of the vacuum pump decreases, and the vacuum pump oil is contaminated
.
If the lyophilizer finds that the oil level drops and the oil produces emulsification, the oil volume should be increased immediately or the vacuum pump oil should be replaced, and find the cause of the pollution, if the vacuum pump absorbs a small amount of water, the gas ballast valve can be opened 0.
5-1h, observe whether the appearance of the vacuum pump oil improves, whether the vacuum degree continues to decline, if the vacuum pump oil element is significantly improved many times, the vacuum pump needs to be overhauled
.
2: The air tightness of the system decreases, and there is a leak
.
Find the leak point, and when the leak point is found, fill the leak, replace the seal, or replace the valve
.
The vacuum system is mainly composed
of vacuum pump, front box, rear box, valve on the box, mushroom valve, butterfly valve, vacuum silicon pipe and other parts.
Daily maintenance of the vacuum system of the lyophilizer in situ: 1) Replace the vacuum pump oil regularly to ensure the performance of
the vacuum pump.
2) Before the vacuum pump starts, check whether the oil level is normal lyophilizer (it should be in the position of about 1/2 of the oil mirror
).
3) Before vacuuming the box, we must ensure that the rear box is dry, so as to avoid pumping water vapor into the pump body and affecting the pumping efficiency
of the vacuum pump.