Oil free centrifugal compressor

DECHUAN manufacturer's Oil free centrifugal compressor series is designed for industrial scenarios requiring large-flow clean air, such as electronics, food, pharmaceutical, and chemical industries. The product uses a high-speed rotating impeller to do work on air, utilizing centrifugal force for oil-free compression, fundamentally preventing lubricating oil from entering the compressed air. The compact structure occupies a small footprint. Energy cost accounts for 80% of the total life cycle cost, so we pay special attention to energy efficiency optimization. In the large flow range above 7,000 m³/h, this series can achieve specific power as low as 5.5 kW/(m³/min), continuously saving electricity costs for users.

Core Technical Advantages

Oil free centrifugal compressor achieves 100% oil-free compression in principle, providing reliable protection for industries with stringent air quality requirements.

• Double seal structure, Class 0 oil-free certification: A double barrier composed of oil seals and air seals ensures that lubricating oil never enters the compression chamber. The compressed air is completely oil-free and has passed Class 0 zero-oil certification, meeting the highest standards of pharmaceutical, food, electronics and other industries.
• Backward curved impeller, high efficiency under all operating conditions: The impeller adopts backward curved blade design for high aerodynamic efficiency. Different power and pressure specifications can optimize performance according to operating conditions, maintaining efficient operation.
• Adjustable inlet guide vanes (IGV), precise energy saving: Servo motor-driven IGV can efficiently regulate flow according to actual air demand, saving up to 9% energy compared to traditional valve regulation.

High-Efficiency Drive and Cooling System

Focusing on maximizing energy efficiency throughout the life cycle, the drive and cooling system have been strengthened in multiple aspects.

• IE4 ultra-premium efficiency motor: Low-voltage models (up to 560kW) come standard with star-delta starters, offering both air-cooled and water-cooled options. The IE4 motor significantly reduces specific energy consumption per unit of air delivery.
• Compact aftercooler: Combines low approach temperature and minimal pressure loss to maximize overall energy efficiency. The independently oversized oil cooler and aftercooler ensure low rotor outlet temperature and extend lubricating oil life.

Application Scenarios

Oil free centrifugal compressor is suitable for various industrial scenarios requiring continuous large-flow, oil-free clean compressed air.

• Chemical and petrochemical industry: Air separation units, instrument air, gas conveying, etc., require large amounts of clean air; the high reliability and oil-free characteristics of the centrifugal compressor perfectly match this demand.
• Automotive manufacturing: Supplies pneumatic tools, painting equipment, and process air for electric vehicle battery production lines.
• Electronics and semiconductor industry: Oil-free air ensures precision components are not contaminated by oil, improving product yield.
• Food and beverage industry: Compressed air directly or indirectly contacts food; Class 0 certification provides solid assurance for food safety.
• Pharmaceutical industry: GMP-compliant environments have extremely high requirements for compressed air purity; oil-free centrifugal compressors are an ideal choice.
• Textile, paper, and chemical fiber industries: Air-jet looms and pneumatic conveying require continuous stable low-pressure high-flow air sources.
• Power and renewable energy: Reliable air source for gas turbine intake cooling, flue gas desulfurization, and other processes.
• Wastewater treatment: Biological aeration systems require large-flow low-pressure air; the equipment is stable, low-noise, and suitable for long-term continuous operation.

The oil-free characteristics and continuous operation capability of this series provide solid guarantees for production line stability and product quality in the above industries.

Customer Value

Oil free centrifugal compressor focuses on the long-term benefits that users care about most, comprehensively solving pain points from design to service.

• Ultra-long reliability: No reciprocating parts, very few wearing parts, design life of 15-20 years, suitable for continuous production running more than 8,000 hours per year. Non-contact compression has a theoretical life exceeding 100,000 hours.
• Extremely low maintenance cost: Daily maintenance only requires regular replacement of filters, lubricating oil, and seals, without complicated disassembly and inspection. Maintenance workload is much less than that of piston or multi-stage screw compressors of the same flow capacity.
• Ultra-high energy efficiency: In large-flow (≥7,000 m³/h), medium-to-low pressure scenarios, the life cycle energy efficiency advantage is significant. Specific power in the high-efficiency range can be as low as 5.5 kW/(m³/min). The electricity saved by first-class energy efficiency models can pay back within a few years.
• Stable and pure output: 100% oil-free compression ensures absolute stability of air quality, suitable for precision manufacturing and direct contact processes.
• Quiet operation: Excellent balance of high-speed rotating parts results in smooth operation and low vibration. Models with soundproof enclosures have even lower noise and can be placed directly next to production lines.
• Compact and easy maintenance: Integrated structural design, some series require no external casing. The touchscreen controller displays pressure, temperature, current, and running hours in real time, with maintenance reminders for proactive alerts.

Technical Specifications

Parameter	Description / Value
Compression Type	Centrifugal, 100% oil-free
Oil-Free Certification	Class 0
Recommended Flow Range	≥ 7,000 m³/h
Single-Stage Pressure Range	≤ 2 bar(g)
Multi-Stage Pressure Range	Up to higher pressures
Motor Efficiency Class	IE4 Ultra-Premium Efficiency
Starting Method	Star-delta (low voltage models ≤560kW)
Cooling Method	Air-cooled or water-cooled optional
Flow Regulation Method	Adjustable Inlet Guide Vanes (IGV)
Energy Saving Effect of Regulation	Up to 9% energy saving
Impeller Design	Backward curved high-efficiency aerodynamic design
Applicable Industries	Chemical, Automotive, Electronics, Food, Pharmaceutical, Textile, Power, etc.

Note: The above are general reference ranges; please refer to the selection proposal for specific model parameters.

Maintenance Guidelines

Correct installation and standardized maintenance are key to ensuring long-term stable operation.

• Installation environment: Well-ventilated, dry, non-corrosive gas location with a flat floor. Reserve at least 1.5 meters of maintenance space around. Keep the air intake away from dust and pollutant emission sources.
• Cooling configuration: For air-cooled models, ensure unobstructed air intake and exhaust; for water-cooled models, ensure cooling water quality, flow rate, and temperature meet requirements. Regularly clean dust from the radiator surface.
• Regular inspection: Check the air filter element every 500 operating hours and clean or replace as needed. Check lubricating oil quality every 2,000 hours and replace according to recommended intervals. Check bearings every 1-2 years, focusing on temperature (should not exceed 85°C) and vibration. Impeller normal service life is 30,000-50,000 operating hours; check immediately if abnormal noise, increased vibration, or decreased discharge pressure occurs. It is recommended to forcibly replace seals every 12-18 months to prevent micro-leakage energy loss (average annual loss 5-8%).
• Operation monitoring: It is recommended to install online vibration monitoring and oil quality analysis devices, which can provide early warning for 75% of lubrication failures. The intelligent touchscreen control system actively warns of potential problems.

Quality and Certification

• Class 0 oil-free certification: Guarantees absolutely oil-free compressed air, meeting the strictest industry standards.
• ISO international standard testing: All products are performance tested according to ISO1217 and relevant standards before leaving the factory, ensuring true and reliable parameters.
• Whole life cycle design: Energy cost accounts for 80%; every detail is optimized to reduce energy consumption.

Why Choose DECHUAN

Oil free centrifugal compressor, with its 100% oil-free compression technology, backward curved high-efficiency impeller, and IE4 ultra-premium efficiency motor, demonstrates excellent energy efficiency and reliability in large-flow continuous production scenarios such as chemical, automotive, electronics, food, and pharmaceutical industries. Class 0 certification guarantees absolutely clean air; adjustable inlet guide vanes save up to 9% energy; the compact structure is easy to install and maintain; the whole life cycle design saves users considerable electricity and operation costs. DECHUAN has years of experience in industrial air system services and a professional technical team, providing full-process support from selection, commissioning to regular maintenance, helping you improve production line stability and reduce operational risks. For a custom selection proposal, please contact the DECHUAN sales engineering team.

FAQ

Q: What is the maintenance interval for the product?

A: Daily maintenance includes checking the air filter element every 500 hours; checking lubricating oil every 2,000 hours and replacing according to recommended intervals; checking bearings every 1-2 years; replacing seals every 12-18 months; impeller normal service life is 30,000-50,000 hours. The touchscreen controller can set maintenance reminders and will automatically alert you when service is due.

Q: Does this equipment achieve true 100% oil-free compression?

A: Yes. The double seal structure composed of oil seals and air seals ensures that lubricating oil never enters the compression chamber. The compressed air is completely oil-free and has passed Class 0 zero-oil certification, making it particularly suitable for pharmaceutical, food, electronics and other industries sensitive to oil contamination.

Q: What are the advantages compared to an oil-free screw air compressor?

A: In large-flow (≥7,000 m³/h) continuous operation conditions, the centrifugal compressor has significantly higher energy efficiency, a smaller footprint, less maintenance work, and also achieves 100% oil-free. For small-to-medium flow and variable operating conditions, oil-free screw compressors are recommended. The two can also be used together to cover a wider range of air demands.

Q: How energy efficient is the equipment?

A: For an Oil free centrifugal compressor, energy cost accounts for 80% of total life cycle cost. Its backward curved impeller and adjustable inlet guide vanes save up to 9% energy, with specific power as low as 5.5 kW/(m³/min), enabling payback within a few years.

Q: Why does it support flow customization?

A: DECHUAN provides customized selection solutions based on the customer's flow (must reach 7,000 m³/h or above), pressure requirements, and operating conditions. By flexibly configuring impeller type, drive power, and control system, the equipment always operates in its best efficiency zone under the customer's specific conditions, maximizing return on investment.

Q: What is the noise level of the equipment? Is it suitable for installation inside a workshop?

A: The high-speed rotating parts have excellent balance, resulting in smooth operation, low vibration, and relatively low noise. Models with soundproof enclosures have even lower noise and can be installed directly inside the production workshop without needing a separate soundproof room.