Low Pressure Screw Type Air Compressor


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Product Name: Low-pressure screw air compressor, Oil-free Screw Air Compressors
Gas Type: Air
Working pressure: (single-stage) 2.1-3.0bar, (double-stage)4.0-5.0bar
Efficiency: Standard and Energy saving
Driven method: Direct driven
Configuration: Stationary
Lubrication Style: Lubricated
Drive method: Variable Speed Drive
Weight: 250-4250kg
Warranty: 2 years
Certification: CE/ASME/ISO
Color: Optional&customization
Local Service Location: Philippines, Mexico, Russia


1. Product Description:

The host specially developed for low-pressure conditions optimizes the screw profile and internal pressure to improve the efficiency of the host. Adopt the design idea of “large rotor, large bearing, low speed” to reduce noise and vibration, and increase the life and stability of the host. The tooth surface is processed by a rotor grinder to create a high-precision rotor, which is the first guarantee for the high efficiency and stability of the host. Compared with the atmospheric pressure machine with the same air volume, it can save energy by more than 50%, and the industry application is more energy-efficient. Protect the environment and reduce usage costs.

Low voltage + two-stage design, extremely energy-saving. The unique intermediate coolant jet curtain design reduces the temperature of the air, and the compression process approaches the most energy-saving isothermal compression. In principle, the two-stage compression saves 5%-8% of energy than the single compression.

Two-stage compression, small compression ratio, less leakage, small bearing load, and greatly improved bearing life.


2. Technical Parameters:


3. How the Sollant Low-Pressure Screw Compressor Works:

The oil-free low-pressure screw compressor, also known as the “helical screw” compressor, is a positive displacement machine that uses rotary motion.

It delivers constant flow (volume) and variable pressure. This means that at a given speed (rpm), the RSW compressor always supplies the same amount of air, independent of pressure variation.

The low-pressure screw compressor consists of a pair of helical profile rotors. One male rotor with 3 convex lobes and one female rotor with 5 concave lobes or “flutes”) contained in a casing.

While maintaining precise alignment by means of timing, the rotors turn in opposite directions. The mesh forms a series of working chambers between the rotors and the casing wall.

The gas is sucked from the intake side (suction), trapped between the rotors and the casing (radially) and the cover (axially). It is then transported to the compression side (discharge) where the working chamber shrinks, and the air is compressed.

The internal compression supplies a steady, non-pulsating air flow. This minimizes vibration and maintenance while maximizing the lifetime of the device.

Due to the fact that there is no oil for sealing (oil-free screw), the rotors have very precise and small tolerances. This maintains a very small air gap between the two in order to guarantee optimal performance without touching each other.

The air-cooled RSW low-pressure screw compressor airend can reach a maximum pressure ratio (outlet pressure divided by inlet pressure) of 3,5.