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The air end of a screw compressor (also known as the main unit or compression element) is the core working component of the compressor, responsible for converting ambient air into high-pressure gas through mechanical motion. Essentially, it consists of a system of high-precision meshing rotors, which achieve gas intake, compression, and discharge through the continuous rotation of the male and female rotors.
Product features
1. Yin-Yang Rotors
The main and auxiliary rotors mesh with a 4:6 or 5:6 gear ratio, forming a compression chamber with variable volume (patented profiles such as SRM and GHH).
2. Rotor Housing
The cast steel/aluminum alloy housing with built-in cooling water channels withstands high temperatures and high pressures (pressure resistance ≥ 1.5 times the operating pressure).
3. Bearing System
Angular contact bearings (axial force) + cylindrical roller bearings (radial force) ensure rotor clearance ≤ 0.02mm.
4. Shaft Seal Assembly
A skeleton oil seal or mechanical seal prevents lubricating oil from leaking into the compression chamber (gas seal for oil-free compressors).
Technical Parameters
| Model | Power (kW) | Flow (m³/min) | Working pressure ( bar) | Weight (kg) |
| CE55RW | 15.8 | 1.77 | 13 | 22 |
| CE55G | 27 | 2.64 | 14 | 30 |
| OS70 | 44.6 | 4.61 | 15 | 43 |
| CF75D8 | 61.3 | 6.16 | 15 | 57 |
| CF75G | 73.3 | 6.94 | 15 | 70 |
| CF90G5 | 85.4 | 8.87 | 15 | 120 |
| CF90LG3 | 88.6 | 11.2 | 10 | 129 |
| CF90D3 | 101 | 10 | 15 | 89 |
| CF90LG5 | 105 | 12.6 | 10 | 129 |
| CF128G | 198 | 20.8 | 15 | 280 |
| CF128LG | 222 | 28.8 | 10 | 330 |
| CF180R | 385 | 41.4 | 15 | 725 |
| OS110 | 139 | 14.68 | 15 | 150 |
| OS163 | 295 | 32.65 | 15 | 430 |
| CF180G2 | 385 | 41.4 | 15 | 780 |
| CF246G | 565 | 66.6 | 13.5 | 1600 |
Application
Manufacturing, electronics and semiconductors, mechanical processing, plastics and rubber, textiles, food and beverages, pharmaceuticals and biotechnology, furniture and wood processing, construction and engineering, mining and quarrying, tunnel engineering, energy and chemicals, oil and gas, chemicals and petrochemicals, water treatment plants and other industries.
Q1: How is the air end of an oil-free compressor sealed?
A: Water-lubricated: Pure water replaces lubricating oil (rotor Teflon coating for rust prevention).
Dry-sealed: Synchronous gearbox isolation + labyrinth seal (clearance <0.01mm).
Q2: Why do variable-frequency air compressors provide better air end protection?
A: Slow speed increase from 0 Hz → Avoids instantaneous torque shock to the bearings from a mains-frequency compressor.
Low-speed operation (25% load) → Reduces compression heat → Reduces the risk of rotor thermal deformation.
Q3: Can air end performance be restored after an overhaul?
A: Professional repair (laser cladding + fine grinding): Efficiency restored to ≥95%.
Manual scraping repair: Efficiency restored to only 70%-80%.
Q4: What are the hazards of excessive exhaust temperature to the air end?
A: High temperature → Carbonization of lubricating oil → Bearing lubrication failure → Rotor locking → Damage to the entire unit.
