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Time：2025-07-10 13:31:18 Reading volume：
The lack of suction in the vacuum pump oil filter may be caused by several reasons, which need to be checked individually from the aspects of system sealing, vacuum pump performance, oil state, filter element blockage, pipeline problems, etc. The following are common reasons and solutions:
1. Aging or contamination of pump oil
- Cause: Deterioration of vacuum pump oil (emulsification, excessive impurities, inconsistent viscosity) will lead to decreased lubrication and sealing performance, affecting the vacuum degree.
- Solution: ｒｅｐｌａｃｅ new pump oil that meets the model and perform regular maintenance (recommended to ｒｅｐｌａｃｅ every 500-1000 hours or as required by the manufacturer).
2. Wear or failure of the vacuum pump
- Cause: Wear of blades, rotors or seals leads to internal leakage and reduced pumping efficiency.
- Solution: Disassemble and inspect the pump body, ｒｅｐｌａｃｅ worn parts (such as vanes, seals), or contact the manufacturer for repair.
3. Improper pump selection
- Cause: The vacuum pump's pumping rate or ultimate vacuum does not match the requirements of the oil filter (such as higher power required when processing high-viscosity oil).
- Solution: Check the working condition requirements and upgrade the vacuum pump model if necessary.
4. Filter element blockage
- Cause: The filter element has not been replaced for a long time, and the accumulation of impurities increases the resistance of the oil and reduces the oil absorption speed.
- Solution: ｒｅｐｌａｃｅ the filter element (pay attention to the matching accuracy level) and check the degree of oil contamination.
5. Leakage or blockage of the oil inlet pipeline
- Cause: The pipeline joint is loose or cracked, or the pipeline is blocked by dirty oil or impurities.
- Solution:
- Check whether there is air leakage at the pipeline connection (apply soapy water to detect bubbles).
- Clean or ｒｅｐｌａｃｅ the blocked pipeline.
6. The oil viscosity is too high
- Cause: Low temperature or excessive oil viscosity (such as unheated gear oil), poor fluidity, resulting in difficulty in oil absorption.
- Solution: Preheat the oil or choose an oil filter with a heating function.
7. The liquid level of the vacuum tank or separator is too high
- Cause: The oil floods the air inlet, affecting the gas suction.
- Solution: Adjust the liquid level to below the safety line to ensure the gas-liquid separation space.
8. Poor exhaust
- Cause: The exhaust valve is not open or the exhaust pipe is blocked, resulting in the inability to discharge the gas from the pump.
- Solution: Check the exhaust valve status and clean the exhaust pipeline.
9. Ambient temperature or altitude influence
- Cause: High temperature environment reduces pump efficiency, the air is thin in high altitude areas, and the upper limit of vacuum degree decreases.
- Solution: Improve ventilation or choose high-temperature/high-altitude resistant equipment.
10. Abnormal vacuum gauge display
- Cause: The vacuum gauge is damaged or calibrated incorrectly, and the suction force is insufficient.
- Solution: Use a standard vacuum gauge for comparison and ｒｅｐｌａｃｅ the faulty instrument.
11. System design defects
- Cause: The pipeline is too long, there are too many elbows, or the volume of the vacuum tank is too small, resulting in excessive resistance.
- Solution: Optimize the pipeline design and reduce elbows and length.
1. Listen to the sound: Is the vacuum pump running abnormally (such as increased noise, internal wear may occur)?
2. Measure the vacuum degree: Close the oil inlet valve and observe whether the vacuum gauge can reach the calibration value (if not, it may be a pump or seal problem).
3. Check the oil: Check the color and viscosity of the pump oil, and whether the oil inlet of the oil filter contains a large amount of impurities or moisture.
4. Check for leaks: Focus on checking flanges, valves, and pipeline connections.
- ｒｅｐｌａｃｅ the pump oil and filter element regularly to avoid overload operation.
- Check the sealing and pipeline status before each use.
- Record the operating parameters (vacuum degree, flow) to facilitate early detection of abnormalities.
If the above methods still cannot solve the problem, it is recommended to contact the equipment manufacturer or professional maintenance personnel for further diagnosis.
