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TECHNOLOGY

Vacuum Oil Purifier Industry Update

This article explores the latest technical developments in vacuum oil purifier technology. As industrial oil cleanliness requirements continue to rise, vacuum oil purifiers have become essential equipment for ensuring reliable operation of transformers, hydraulic systems, and other critical machinery.

Technical Background

1. Vacuum Dehydration Principle

Modern vacuum oil purifiers operate by heating oil to a controlled temperature and exposing it to high vacuum conditions. Water and dissolved gases are removed through evaporation at reduced pressure, achieving moisture levels below 50 ppm.

2. Multi-Stage Filtration Design

High-efficiency filtration systems incorporate multiple filter stages with progressively finer precision, from coarse particulate removal (100 μm) to fine filtration (1 μm), achieving NAS Grade 5 cleanliness output.

3. Intelligent Control Systems

PLC-based automatic control systems enable one-button start/stop operation, real-time monitoring of temperature, pressure, vacuum, and flow rate, with automatic alarms and safety shutdown protection.

Vacuum Oil Purifier Working Principle

A vacuum oil purifier operates on the principle of vacuum dehydration and degassing. The oil is first heated to an optimal temperature (typically 40-80°C), then exposed to high vacuum conditions inside a vacuum chamber. Under reduced pressure, water boils and evaporates at much lower temperatures, and dissolved gases are released. The dehydrated and degassed oil then passes through multi-stage precision filters to remove solid particles. The result is clean oil with significantly improved dielectric strength, viscosity, and chemical stability.

Two-Stage Vacuum Oil Purifier

For applications requiring ultra-high cleanliness (such as EHV/UHV transformer oil, nuclear power, and aerospace), a two-stage vacuum oil purifier uses two vacuum pumps in series — typically a Roots pump followed by a rotary vane pump — to achieve vacuum levels below 5 Pa. This enables moisture reduction to below 5 ppm and gas content below 0.05%, meeting the most stringent cleanliness standards in the industry.

Application Areas

Power Transformer

High-Voltage Insulating Oil

Industrial Lubricating Oil

Hydraulic Oil

Turbine Oil

Steel Mill

Petrochemical

Rail Transit

Wind Power

Conclusion

As industrial oil cleanliness requirements continue to rise, vacuum oil purifiers and two-stage vacuum oil purifiers have become essential equipment across multiple industries. Chongqing Yanneng Oil Filter Machine Co., Ltd. is committed to providing high-quality oil filtration solutions to help industrial customers achieve reliable operation, extend equipment service life, and reduce maintenance costs.

Need Expert Advice on Oil Filtration?

Contact Yanneng for vacuum oil purifiers, two-stage vacuum oil purifiers, and custom oil filtration solutions.
Service Hotline: 400-023-9089 · Email: info@yanneng.com