Screw Compressors 11kW - page 1

An 11 kW screw compressor works by reducing the volume between rotating screw rotors, which draws in, compresses and expels air. Key components include the drive motor, two intermeshing screw rotors, housing, oil separator (in oil-injected models), cooler and filters. Continuous, pulsation-free compression enables stable operation, and the 11 kW motor provides high capacity and pressure stability, making it an efficient solution for industry.

Construction of a screw compressor:

• Screw mechanism: the heart of the compressor, consisting of two interlocking rotors (screws) rotating in opposite directions within a casing.
• Screw rotors: have a spiral shape and interlock with each other, creating chambers of variable volume.
• Electric motor: drives the rotors, providing energy for the compression process.
• Oil separator: separates oil from the compressed air after passing through the screw stage.
• Refrigerant dryer: removes moisture from the compressed air, protecting tools and installations from corrosion.
• Filters: pre-filter and final filter air and oil, ensuring their purity.

Operating principle of the screw compressor:

1. Suction: air from the surroundings is drawn into the compressor through a valve secured with an air filter.
2. Compression: the rotating screw rotors draw in air and trap it in chambers between their teeth.
3. Volume reduction: as the rotors turn, the volume of these chambers decreases, leading to an increase in air pressure.
4. Discharge: compressed air is expelled through an outlet opening outside the compressor block.
5. Cooling and separation: hot, compressed air containing oil vapors flows through the oil separation system and cooler, where it is cooled and purified.
6. Treatment: the purified and cooled air is then directed to the installation, often through final filters and a dryer.

How to choose a screw compressor for your needs?

To choose an 11 kW screw compressor, you need to define the required pressure and air flow demand (e.g., in m³/min or L/min) for specific applications in your facility. Then, select an 11 kW compressor model that provides the required performance at the target pressure and ensures stable operation.

Steps to choose a screw compressor:

1. Determine the required pressure: establish what pressure (in bars) is needed for all tools and processes in your company, as different applications require different pressure values.
2. Determine the required air flow: identify your demand for compressed air, measured in liters per minute (L/min) or cubic meters per minute (m³/min).
3. Choose the appropriate power and model: select an 11 kW screw compressor that will provide the required performance at the appropriate working pressure.
4. Pay attention to the type of compressor:
   1. Constant speed: Suitable for applications with a constant air demand.
   2. Variable speed drive (VSD): A better choice when air demand is variable, as it adjusts its speed to current needs.

Consider additional factors:

• Quality of compressed air: Depending on the industry, it may be necessary to use a dryer and filters to ensure the appropriate air quality.
• Noise level: Some models generate more noise than others, which can be significant for the workplace.

What tank is usually suitable for an 11 kW compressor:

For an 11 kW compressor, a tank with a capacity of 500 liters is often sufficient and provides stable, continuous operation. The tank capacity allows for the accumulation of compressed air and smooths out uneven demand.