Reasons for low vacuum degree of oil filter

Low vacuum degree of the oil filter will affect its dehydration and degassing efficiency. Common reasons can be divided into four aspects: mechanical, operational, oil and environment. The following is a detailed analysis and solution:

1. Mechanical system problems

(1) Vacuum pump failure

- Causes:

- Vacuum pump oil pollution or insufficient

- Pump wear (such as vane damage)

- Exhaust valve blockage or poor sealing

- Solution:

- Check and ｒｅｐｌａｃｅ vacuum pump oil

- Repair or ｒｅｐｌａｃｅ worn parts

- Clean the exhaust valve to ensure sealing

(2) Vacuum pipeline leakage

- Causes:

- Loose, aged or damaged pipe joints

- Failure of sealing rings/gaskets

- Solution:

- Use soapy water or helium mass spectrometer leak detector to find the leak

- ｒｅｐｌａｃｅ seals and tighten joints

(3) Vacuum gauge or sensor failure

- Causes:

- Instrument calibration failure or damage

- Sensor signal drift

- Solution:

- Compare and calibrate with a standard vacuum gauge

- ｒｅｐｌａｃｅ the faulty instrument

2. Oil problems

(1) The water content in the oil is too high

- Cause:

- The oil is saturated with water, exceeding the processing capacity of the oil filter

- Solution:

- Extend the dehydration time or pre-treat the oil (such as sedimentation separation)

(2) The oil viscosity is too high

- Cause:

- Low temperature or oil quality deterioration leads to poor fluidity

- Solution:

- Heat the oil to a suitable temperature (usually 40~60℃)

- ｒｅｐｌａｃｅ with low-viscosity oil or add viscosity reducer

(3) The oil is seriously contaminated

- Cause:

- Solid particles block the filter element or vacuum system

- Solution:

- Perform coarse filtration first (such as centrifugal separation)

- ｒｅｐｌａｃｅ with a high-precision filter element

3. Operational problems

(1) The oil intake is too large

- Cause:

- Exceeding the processing capacity of the equipment, and the gas cannot be pumped out in time

- Solution:

- Adjust the oil inlet valve to control the flow rate to the rated range

(2) The vacuum tank level is too high

- Cause:

- The oil floods the exhaust port, hindering the gas discharge

- Solution:

- Adjust the level sensor or manually control the oil level

(3) Poor exhaust

- Cause:

- The exhaust pipe is blocked or condensate accumulates

- Solution:

- Clean the exhaust pipe and install a condensate collector

4. Environmental factors

(1) Influence of altitude or temperature

- Cause:

- The atmospheric pressure is low in high-altitude areas, and the upper limit of vacuum is reduced

- Low temperature causes poor fluidity of the oil

- Solution:

- ｓｅｌｅｃｔ a high-power vacuum pump (high altitude equipment)

- Increase the ambient temperature or heat the oil

(2) Cooling system failure

- Cause:

- The efficiency of the condenser decreases (such as insufficient cooling water, dirty heat sink)

- Solution:

- Check cooling water circulation and clean condenser

Troubleshooting process recommendations

1. Preliminary inspection: confirm whether the vacuum gauge is normal, check the oil level and oil temperature.

2. Leak test: close the oil inlet valve and observe whether the vacuum degree can be stabilized (if it continues to ｄｒｏｐ, there is a leak).

3. Segmented inspection: check the vacuum pump, pipeline, condenser, and oil status in turn.