PM&VSD Oil‑Free Screw Blower

Product Overview

OSG PM&VSD Oil‑Free Screw Blower adopts advanced internal‑compression screw principle to deliver ISO 8573‑1 Class‑0 oil‑free clean air. As a new‑generation high‑efficiency air source equipment, it achieves prominent energy‑saving performance, lower noise and less vibration compared with traditional Roots blowers under identical air flow and pressure. Designed for reliable 24/7 continuous operation, it is widely used in wastewater aeration, dilute‑phase pneumatic conveying, biological fermentation, flue‑gas desulfurization & denitrification and other industrial sectors.

Key Features

1. High‑efficiency Screw Air End Manufactured by world‑leading high‑precision molding production line. Advanced rotor coating technology minimizes rotor working gap to improve volumetric efficiency. Meanwhile, it provides effective protection for rotors to extend service life.
2. World‑class Core Components for High Reliability Equipped with globally famous FAG bearings. Adopts international Grade‑5 precision synchronous gears and driving wheels to guarantee stable heavy‑duty performance and prolong service life.
3. Class‑0 Oil‑free Compressed Air Combined labyrinth seal plus screw seal assembly completely separates lubrication chamber from compression cavity, realizing Class‑0 oil‑free air output. Unique lubricating and oil‑draining channel ensures sufficient lubrication and cooling for bearings and gears, and optimizes main unit efficiency.
4. Superior Energy‑saving Performance Benefiting from internal compression design, it avoids energy waste caused by high‑pressure gas back‑rush which is common for Roots blowers. It can save 20%‑35% power consumption under same working conditions. Higher working pressure brings more remarkable energy‑saving effect. The maximum energy saving rate of oil‑free blower can reach 50%, greatly cutting customers’ electricity operating cost.
5. Low Noise & Low Vibration Traditional Roots blower suffers gas ramming impact during exhaust, resulting in heavy low‑frequency noise and strong vibration. Our screw blower eliminates such gas impact. Its noise level is 15‑30 dB(A) lower than Roots blowers with greatly reduced vibration. Extra sound‑proof room is not required for most installation sites to reduce civil‑engineering investment.

Application Fields

1. Wastewater Treatment Suitable for municipal sewage, textile printing & dyeing, leather, pharmaceutical, chemical, papermaking, breeding and slaughtering industries. The aeration oxygen‑supply system accounts for 50%‑55% of total power consumption of wastewater plants. Choosing this high‑efficiency blower will bring considerable economic benefits.
2. Dilute‑phase Pneumatic Conveying Powder material conveying for cement plants and petrochemical industry. Energy cost takes up over 80% of blower life‑cycle cost. Advanced screw blower technology reduces maintenance downtime.
3. Fermentation Industry Wide adjustable range of flow and pressure, supporting non‑stop 24‑hour operation. Also applicable for non‑woven fabric production, air‑knife and fiber texturing process. On‑site installation without additional noise‑protection measures.
4. Desulfurization & Denitrification Works as oxidation blower for thermal power, steel, glass and chemical factories. It supplies clean process air for boiler flue‑gas treatment to meet environmental protection emission standards.

Technical Specification

OSG‑EGV Series PM&VSD Oil‑Free Screw Blower

Note: Above data is for series reference. Exact parameters shall follow the technical datasheet of specific model.
Packing & Shipment
Unit is wrapped with waterproof stretch film and packed in solid plywood wooden case. It is well fixed for container sea shipment and long‑distance land transportation. Custom overseas voltage and CE documents can be provided for export projects.
FAQ
Q1: What is the major difference between oil‑free screw blower and Roots blower?
A: Screw blower is featured with internal compression while Roots blower has no internal compression. Under same flow and pressure, screw blower saves 20%‑35% energy, and performs much better in noise and vibration. It supplies ISO 8573‑1 Class‑0 oil‑free air. Roots blower has lower purchase cost but higher power consumption, noise and vibration.
Q2: What does Class‑0 oil‑free mean? Is the blower totally oil‑less inside?
A: Class‑0 is the highest air‑purity grade of ISO 8573‑1 standard. Labyrinth and screw sealing prevent lubricant entering compression cavity so that outlet air is oil‑free. Please note that gearbox still needs lubricant for bearings and gears; only the output compressed air is oil‑free.
Q3: Can this blower run 24 hours non‑stop?
A: Yes. Equipped with FAG bearings and Grade‑5 precision synchronous gears, it is engineered for 24/7 heavy‑duty industrial operation. Please strictly follow recommended maintenance schedule for oil replacement.
Q4: Can you supply 60Hz version for American & Latin‑American market?
A: Yes. Custom 3‑phase 230/460V‑60Hz is supported. CE certification documents can be offered for container export.
Q5: What are routine maintenance items and service intervals?
A: Main jobs include gear‑box oil change, air filter inspection & replacement, fastener checking. First oil change after 2000 working hours; subsequent oil change every 8000 working hours. Inspect or replace air filter every 3‑12 months according to site dust condition.
Q6: Is sound‑proof room necessary for installation?
A: Extra sound‑proof room is unnecessary for most indoor applications thanks to low‑noise design. Simple noise‑reduction measures are suggested if installed close to office or residential zones. Only flat concrete foundation is required.
Q7: Can air flow be adjusted? What is the adjustment range?
A: PM‑VSD model adjusts rotating speed via frequency converter. Air flow can be continuously adjusted from 40%‑100% nominal flow with stable pressure, ideal for fluctuating wastewater aeration working conditions.
Q8: What pressure range is suitable for OSG screw blower?
A: Normal working pressure: 0.3‑1.2 bar(g), widely used for aeration, oxidation and dilute‑phase pneumatic conveying. Please consult our technical team for working conditions beyond this scope.