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Time：2025-04-30 11:59:02 Reading volume：
The vacuum oil filter is mainly used to remove moisture, gas and mechanical impurities from hydraulic oil, insulating oil and other oils. Its dehydration principle is based on vacuum distillation and atomization separation technology. The core steps are as follows:
The vacuum oil filter reduces the boiling point of water by reducing the system pressure (vacuum environment), allowing the water to evaporate at a lower temperature. At the same time, it uses atomization and large surface area contact to improve the separation efficiency of water and gas.
(1) Heating stage (optional)
- The oil first passes through a heater (usually controlled at 60-70℃) to reduce viscosity and promote water evaporation (but the temperature should not be too high to avoid oil oxidation).
- Note: Some vacuum oil filters do not require heating and only rely on vacuum dehydration.
(2) Vacuum atomization separation
- The vacuum pump extracts air from the oil filter to form a high vacuum environment (usually absolute pressure ≤0.1kPa, or even lower).
- The oil is sprayed or atomized into tiny oil droplets (increasing the surface area) and enters the vacuum separation chamber.
- Under low pressure, the boiling point of water and light volatiles is greatly reduced, and they evaporate quickly into water vapor.
(3) Gas-liquid separation
- The evaporated water vapor and gas are pumped out by the vacuum pump, cooled by the condenser, and collected or discharged.
- The dried oil droplets re-aggregate in the separation chamber and settle to the bottom.
(4) Precision filtration
- The dehydrated oil passes through a fine filtration system (such as a 1-5μm filter element) to remove residual particles and ensure the cleanliness of the oil.
| Factors | Influence |
|---------------------|----------------------------------------------------------------------|
| Vacuum degree | The higher the vacuum degree (the lower the absolute pressure), the lower the boiling point of water and the faster the dehydration speed. |
| Oil temperature | Appropriate heating (60-70℃) can accelerate the evaporation of water, but too high a temperature will cause oil oxidation. |
| Oil atomization effect | The finer the atomization, the larger the surface area, and the more thorough the evaporation of water. |
| Residence time | The longer the oil stays in the vacuum separation chamber, the more complete the dehydration. |
| Initial water content of the oil | The higher the water content, the longer the dehydration time, and multiple cycles may be required. |
- Efficient dehydration: free water, dissolved water (even ppm-level trace water) can be treated.
- Protect oil quality: a low-temperature vacuum environment to prevent high-temperature oxidation of oil.
- Multi-function: simultaneous removal of gas (such as air) and mechanical impurities.
- Automated control: modern equipment is equipped with moisture detection and automatic drainage functions.
- Oil recovery after water ingress in the hydraulic system.
- Transformer insulating oil (extremely low water content required).
- Regeneration of industrial oils such as turbine oil and lubricating oil.
- Safe operation: Prevent oil foam from overflowing in a vacuum environment.
- Regular maintenance: Clean the vacuum pump oil and ｒｅｐｌａｃｅ filter elements to avoid secondary contamination.
- Oil compatibility: Some synthetic oils may not be suitable for high-temperature vacuum treatment.
The water content of the oil treated by the vacuum oil filter can be reduced to less than 50 ppm (depending on the performance of the equipment), which meets the use requirements of most industrial systems.
