Screw Air Compressor

A screw air compressor is a type of positive displacement compressor that uses helical screws (rotors) to compress air. It is widely used for its efficiency, reliability, and suitability for continuous operation. Below is a structured breakdown of its components, working principles, types, applications, and considerations.

Working Principle

1. Air Intake: Ambient air enters through an inlet filter.
2. Compression:

Two intermeshing rotors (male and female) rotate in opposite directions within a housing.

As the rotors turn, air is trapped in the decreasing volume between the rotors and the housing, compressing it progressively.

3. Discharge: Compressed air exits through the discharge port into the system.

Feature

• Water cooling engine
• coupling drive
• Huge air intake filters which are easily accessible for maintenance or replacing
• Fuel filter with sigh glass for easy identification.
• LCD control panel
• Twin air outlet
• Ease of servicing with easy access parts
• Lockable panels with pneumatic support
• Battery isolator switch
• Isolating switch at control panel
• Diesel engine will idle when pressure reached.
• Sound proof cabinet
• Low diesel consumption
• Automated fault finding and recording
• Storage battery inlcuded.
• Types of Screw Compressors

1. Oil-Injected:

Uses oil for lubrication, cooling, and sealing.

Common in industrial settings (e.g., manufacturing, automotive).

Requires regular oil changes and filtration.

2. Oil-Free:

Uses timing gears or coatings to prevent rotor contact.

Ideal for sensitive applications (e.g., food, pharmaceuticals).

Higher initial cost but eliminates oil contamination risk.

3. Single-Stage vs. Two-Stage:

Single-Stage: One compression step; suitable for moderate pressures.

Two-Stage: Compresses air in two steps with intercooling for higher efficiency and pressure.

Applications

Industrial: Manufacturing, plastics, textiles.

Construction: Pneumatic tools, sandblasting.

HVAC: Refrigeration systems.

Energy: Gas pipeline compression.

Specialized: Oil-free variants in medical, food, and electronics industries.

Advantages

Continuous Operation: No pulsation, ideal for 24/7 use.

Efficiency: Better part-load performance, especially with VSD.

Durability: Lower vibration, longer lifespan than piston compressors.

Low Maintenance: Fewer moving parts compared to reciprocating models.

Maintenance Considerations

Oil-Injected: Monitor oil quality, replace filters, and check for leaks.

Oil-Free: Inspect rotor coatings and timing gears.

General: Clean/replace air filters, check cooling systems, and drain condensate.

Comparison with Reciprocating Compressors

Screw Compressors: Better for continuous, high-demand use; quieter and more efficient at scale.

Piston Compressors: Lower upfront cost, suitable for intermittent use.

Safety and Efficiency Features

Pressure Relief Valves: Prevent over-pressurization.

Air Dryers: Remove moisture to protect downstream equipment.

Temperature Controls: Avoid overheating.

Notice: There is a chance that SHANDIKE may make changes on above-mentioned information. Product pictures and parameters about models, data, performances and specifications on this website are for reference only.