E-mail seo@sino-purification.com
Time：2025-09-15 13:45:49 Reading volume：
The vacuum pump is one of the most critical components in an oil filter system. Without it, the process of vacuum oil filtration would not be possible. It serves as the heart of the system, ensuring that oil purification is efficient, reliable, and capable of meeting strict industrial standards.
In this article, we’ll explain the functions of the vacuum pump in an oil purifier and why it is essential for maintaining oil quality and protecting equipment.
The main role of the vacuum pump is to create and maintain a high-vacuum environment inside the filtration system. This controlled environment is the foundation for effective dehydration and degassing. Specifically, the vacuum pump contributes in three key ways:
By lowering the pressure in the vacuum tank (typically –0.08 MPa to –0.099 MPa or higher), the vacuum pump reduces the boiling point of water in oil.
At normal atmospheric pressure, water boils at 100°C.
Under a vacuum, water can boil and evaporate rapidly at 50–60°C.
Benefit: This allows efficient moisture removal without exposing the oil to high temperatures that could cause thermal decomposition or oxidation.
During operation, insulating oils or lubricating oils often contain dissolved air (oxygen, nitrogen) and sometimes fault gases (acetylene, methane). These gases can:
Reduce the oil’s dielectric strength.
Accelerate oxidation and acid formation.
Causes equipment failures, such as cavitation or poor lubrication.
The vacuum environment encourages these gases to escape from the oil, similar to how carbon dioxide escapes when opening a soda bottle. The vacuum pump then extracts these gases, ensuring cleaner, more stable oil.
The vacuum pump generates negative pressure inside the tank, creating a pressure differential with the outside atmosphere. This pressure difference:
Draws contaminated oil into the vacuum tank.
Assists in moving purified oil out through the discharge pump.
Ensures continuous oil circulation for uninterrupted filtration.
The performance of the vacuum pump directly determines the effectiveness of oil filter purification. Without it, moisture and gases could not be effectively removed, making oil regeneration incomplete.
Think of an oil filter as an oil washing plant:
The filter elements and screens are like sieves that capture solid impurities.
The vacuum pump acts as the plant’s dehumidification and exhaust system.
Even if impurities are filtered, oil with excessive water or gas will still be substandard and harmful to equipment.
Key Benefits of a High-Performance Vacuum Pump
Ensures Oil Quality
The two most important oil filter performance indicators are moisture content and gas content.
These depend almost entirely on the vacuum level achieved by the pump.
A strong, stable vacuum pump ensures oil meets international standards for dielectric strength and reliability.
Improves Filtration Efficiency
A higher vacuum accelerates water evaporation and gas release.
This shortens treatment time and increases the throughput capacity of the purifier.
Protects Equipment and Extends Oil Life
Removing moisture and oxygen slows down oxidation, extending the oil’s usable life.
Cleaner oil reduces corrosion, rust, and bubble formation, protecting critical machinery such as transformers, turbines, and gearboxes.
Conclusion
The vacuum pump in an oil filter is not just a supporting part—it is the core driver of purification performance. By lowering the boiling point of water, removing harmful gases, and maintaining continuous oil circulation, it ensures both oil quality and system efficiency.
For industries relying on transformer oil, turbine oil, or lubricating oil filtration, selecting an oil purifier equipped with a high-quality vacuum pump is crucial for achieving long-term reliability, minimizing maintenance costs, and extending equipment lifespan.
