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Energy-Saving Oil-Free Screw Blower for Wastewater Treatment Plants

A blower is a type of mechanical device that is mainly used to transport air or other gases. It works by the rotation of impellers or vanes inside, which increases the pressure of the gas and forces it to flow. Blowers are widely applied in various fields such as industrial ventilation, pneumatic conveying systems, and wastewater treatment plants. They come in different types, including centrifugal blowers and positive displacement blowers, each with its own unique features and suitable applications. Compared with some other gas delivery equipment, blowers are often known for their relatively high flow rate and moderate pressure capabilities.
 
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The operation of the oil-free screw blower is based on a highly precise positive displacement compression mechanism. The core of this system consists of a pair of carefully profiled screw rotors (male and female), heavy-duty casings, synchronous timing gears, precision bearings, advanced sealing devices, and other interconnected mechanical components. When the electric motor drives the leading screw rotor to rotate, the driven screw rotor also rotates synchronously in the opposite direction. This synchronized movement is precisely controlled by the timing gears, ensuring that the two rotors maintain a strict microscopic clearance and never physically touch each other during operation.

As the rotors turn, sealed chambers are continuously formed between the rotor profiles and the internal walls of the casing. The ambient air is drawn into these chambers through the inlet port. As the rotation continues, these trapped air pockets gradually move from the suction end toward the exhaust port. During this movement, the internal volume of the chambers progressively decreases, which forces the air molecules closer together and results in the steady compression of the gas. Finally, the compressed air is smoothly discharged through the exhaust port into the piping system. This continuous rotary motion provides a stable, pulsation-free airflow essential for industrial aeration processes.

A critical aspect of this mechanical design is its ability to deliver completely clean air. Thanks to advanced sealing and lubrication technology, no lubricating oil is required within the compression chamber itself. The precise clearance between the rotors eliminates the need for oil to prevent metal-to-metal friction. Furthermore, specialized shaft seals are employed to create a strict physical barrier between the gear and bearing lubrication system and the air compression chamber. This structural isolation guarantees that no oil vapor can contaminate the airflow, ensuring the strict oil-free quality of the compressed air delivered to the wastewater treatment tanks.

  • Structural Composition 

Generally, the entire blower package is engineered for optimal mechanical integration and reliability. It consists primarily of a robust outer cover (acoustic enclosure), a main engine (screw host), a high-efficiency motor, an intake air filter, a discharge muffler, an oil pump tank, and an oil filter. Each physical component plays a specific role in the operation of the machine:

  • Screw Host (Main Engine): This is the core mechanical component where the actual gas compression takes place. It mainly comprises the casing, precisely machined screw rotors, the gearbox housing the timing gears, bearings to support the rotor shafts, and the critical shaft seal assemblies.
  • Electric Motor: The primary power source that drives the main rotor. It is mechanically coupled to the screw host to transmit rotational force efficiently.
  • Air Filter Assembly: Positioned at the intake, it physically removes airborne particulates and dust before the ambient air enters the compression chamber, protecting the internal rotors from abrasion and extending the equipment's lifespan.
  • Silencer / Muffler: Installed at the discharge end, this component is structurally designed with internal baffles to smooth out the airflow and manage the acoustic energy generated during the compression cycle.
  • Lubrication System: While the compression chamber is oil-free, the mechanical gears and bearings require lubrication. The oil pump tank and filter form a closed-loop system that circulates oil exclusively to the mechanical transmission components, kept strictly separated from the air path.

To better understand the internal mechanical movements and the structural layout of the oil-free screw blower, please refer to the operational demonstration video below.


Core Advantages of Luoyou Screw Blowers

Investing in the right aeration equipment is crucial for optimizing operational costs and ensuring process stability in wastewater treatment. The Luoyou energy-saving oil-free screw blower offers a comprehensive range of technical advantages designed to meet the rigorous demands of modern industrial and municipal facilities, helping procurement teams lower long-term operational risks and enhance overall plant efficiency.

  1. High Efficiency and 20%-35% Energy Savings

    When upgrading wastewater treatment plants, energy consumption is a primary concern, as aeration typically accounts for the majority of electricity usage. The Luoyou brand oil-free screw blower is engineered with an advanced screw profile design and an optimized motor drive system. This configuration significantly enhances overall aerodynamic efficiency. Compared to conventional roots blowers, our equipment delivers remarkable energy savings of over 20% to 35% during prolonged operation. Furthermore, the integration of permanent magnet synchronous frequency conversion motors ensures that these energy-saving benefits remain highly stable and reliable, drastically reducing operational electricity costs for large-scale aeration projects.

  2. 100% Oil-Free and "Class 0" Clean Air Delivery

    Maintaining absolute air purity is critical for sensitive biological treatment processes. Our screw blowers operate completely without lubricating oil in the compression chamber, eliminating any risk of oil contamination in the compressed air stream. This guarantees the delivery of pure air that strictly meets the highest "Class 0" oil-free standard. By preventing oil carryover, the cleanliness and safety of downstream gas-using equipment are fully ensured. This not only protects the aeration diffusers from premature clogging but also significantly extends the service life and maintenance intervals of your entire aeration system, minimizing replacement costs.

  3. Exceptional Mechanical Reliability and Low Maintenance

    Industrial wastewater environments demand robust and dependable equipment. The Luoyou screw blower features a highly streamlined and relatively simple structure comprising fewer moving components, which inherently reduces the potential for mechanical failure. The precision-engineered screw rotor demonstrates excellent dynamic balance, resulting in minimal vibration during continuous operation. This high mechanical reliability translates into an extended maintenance cycle, ensuring consistent, uninterrupted performance even in the harshest and most demanding working environments. Plant operators can rely on reduced downtime and lower long-term maintenance expenses.

  4. Ultra-Low Noise Operation Below 60 dB(A)

    Noise pollution is a significant challenge in modern industrial facilities. Our energy-saving screw blowers are specifically designed to address this issue at the source. The aerodynamic noise generated by the precisely machined screw rotor is inherently minimal. To further mitigate sound emissions, the equipment incorporates a specially designed air intake and ventilation diversion system, combined with a highly effective composite anti-integrated exhaust muffler. Consequently, the overall operational noise level of the machine is strictly maintained below 60 dB(A), creating a safer, more comfortable working environment for plant personnel and complying with strict industrial noise regulations.

  5. Intelligent Control for Precise Aeration

    Adapting to fluctuating biological oxygen demands is essential for optimal wastewater treatment efficiency. Our blowers feature an advanced intelligent control system that allows for a wide range of air volume adjustments. Operators can easily modify the motor speed or utilize the inlet control valve to match real-time system requirements. The intelligent control panel continuously monitors operating parameters and can automatically adjust performance based on dissolved oxygen (DO) levels or pressure readings. This capability enables precise aeration control, preventing both energy-wasting over-aeration and process-damaging under-aeration, which significantly improves the overall operational efficiency and process stability of the facility.

The energy-saving oil-free screw blower is engineered to meet the demanding requirements of various industrial applications where clean, reliable, and continuous compressed air is critical. By delivering 100% oil-free air, this blower eliminates the risk of product contamination and system degradation, making it the ideal choice for sectors with stringent environmental, operational, and hygiene standards. Below are the primary application scenarios where our blowers deliver exceptional value and solve specific industry pain points.

  1. Water Treatment Industry: In municipal wastewater treatment plants, the activated sludge process relies heavily on continuous and precise aeration to sustain microbial life. One of the primary pain points in this sector is maintaining optimal oxygen transfer efficiency without introducing contaminants. Even trace amounts of oil in the compressed air can form a film on the water surface, inhibiting oxygen absorption and negatively impacting microbial activity. Our oil-free screw blower provides a highly stable, 100% oil-free air supply, which is crucial for maintaining consistent biological processes and maximizing the overall effectiveness of sewage treatment. Furthermore, the ability to accurately control the air volume ensures that facilities can match fluctuating oxygen demands, thereby optimizing operational stability and avoiding unnecessary energy waste. Beyond wastewater, this blower is equally vital in drinking water treatment facilities, where the aeration process must adhere to the highest purity standards to guarantee the safety, hygiene, and exceptional quality of the public water supply.


  2. Pharmaceutical Industry: The pharmaceutical manufacturing environment demands uncompromising cleanliness, as any contamination can lead to severe safety risks, costly batch rejections, and regulatory compliance failures. During the preparation, mixing, and packaging processes, compressed air frequently comes into direct contact with sensitive drug formulations and active pharmaceutical ingredients (APIs). Therefore, pharmaceutical facilities must employ an aeration solution that guarantees absolute purity. Our oil-free screw blower is rigorously tested and has been certified by the German TÜV, successfully obtaining the stringent ISO 8573-1 Class 0 certification. This internationally recognized standard ensures that the compressed air produced is entirely free of oil aerosols, vapors, and liquids. By utilizing this specialized blower, pharmaceutical manufacturers can confidently safeguard the integrity of their cleanroom environments, prevent the introduction of minute pollutants, and ensure the ultimate quality, efficacy, and safety of their medical products.


  3. Other Industrial Fields: Beyond water treatment and pharmaceuticals, the demand for clean, reliable, and continuous air spans numerous industrial sectors. In processes such as biological fermentation, delivering pure, uncontaminated oxygen is essential for maximizing cell growth and product yield without introducing harmful foreign substances. For pneumatic conveying and material transportation, particularly in the food and chemical industries, oil-free air prevents powders and granular materials from clumping or degrading during transit. In surface treatment applications like electroplating and galvanizing, oil-free aeration ensures that plating solutions remain uncontaminated, preventing surface defects on the finished metal parts. The blower is also widely deployed in aquaculture aeration for breeding, oxidative desulfurization, textile manufacturing, mixing, and printing. Across all these diverse applications, facilities benefit from a reliable air source that supports continuous production cycles, reduces the risk of operational downtime, and meets the rigorous demands of modern industrial processing.


1. Who are we?

We are a professional compressor manufacturer based in Shanghai. With over 10 years of dedicated experience in producing and exporting air compressors, air dryers, and air filters, we provide reliable equipment solutions for global industrial procurement needs.


2. How about your customer service?

We provide 24-hour online customer service to ensure prompt communication. Our dedicated support team is always available to assist with inquiries, order processing, and after-sales support, ensuring a smooth and efficient purchasing experience.


3. Why choose us?

We combine advanced manufacturing technology with rigorous quality control. Backed by a well-known reputation in both domestic and overseas markets, we are highly confident in delivering dependable products and comprehensive services that meet strict industrial standards.


4. What are the payment terms?

To facilitate flexible and secure transactions for our buyers, we accept a variety of payment methods, including T/T, L/C, D/P, Western Union, PayPal, and Credit Cards.


5. Can products be customized?

Yes, we offer professional customization capabilities. We can alter, re-design, and reassemble our products to precisely meet clients' specific technical requirements and project demands upon request.

Oil-Free Screw Blower Technical Parameters
Model Power (kW) Working Pressure (Bar) FAD
(m3/min)
Outlet Pipe Outline Specification (mm) Weight (kg)
LY-11GF 11 0.6 6.5 DN125 2100*1350*1570 1500


0.7 5.9




0.8 5.3




1 4.2




1.2 3.2


LY-15GF 15 0.6 9 DN125 2100*1350*1570 1600


0.7 8




0.8 7.5




1 6




1.2 5


LY-22GF 22 0.6 16 DN125 2200*1400*1600 1800


0.7 13




0.8 11.5




1 10




1.2 8.5




1.5 6


LY-30GF 30 0.6 24 DN125 2200*1400*1600 2000


0.7 18.9




0.8 17




1 14




1.2 11.3




1.5 9


LY-37GF 37 0.6 28 DN200 2650*1300*1830 2200


0.7 25




0.8 22




1 17.5




1.2 14.2




1.5 10.5


LY-45GF 45 0.6 34.4 DN200 2650*1300*1830 2200


0.7 32




0.8 30




1 23




1.2 18




1.5 14


LY-55GF 55 0.6 40.9 DN200 2900*1500*2000 2400


0.7 40




0.8 37




1 29




1.2 25




1.5 17.9


LY-75GF 75 0.6 60 DN200 2900*1500*2000 2400


0.7 54




0.8 50




1 43




1.2 37




1.5 29


LY-90GF 90 0.6 65 DN250 3000*1650*2150 2600


0.7 56




0.8 61




1 52




1.2 45




1.5 36


LY-110GF 110 0.6 83 DN250 3000*1650*2150 2600


0.7 74




0.8 66




1 65




1.2 56




1.5 45


LY-132GE 132 0.7 90 DN300 3200*1800*2200 3000


0.8 83




1 69




1.2 56




1.5 53


LY-160GF 160 1 86 DN300 3200*1800*2200 3000


1.2 75


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