Axial Fans - Components for Screw Compressor Systems
In the case of air-cooled screw compressor systems, the cooling air is pressed through the cooler fins by the fan. Axial-designed fans are used for this more often than radial-designed fans. The fan impellers, which are mounted on the driving shaft by means of a suitable hub, are an important component of the system.
Depending on the cooler design, the fans can be used to draw air in or push air out. Each fan only achieves optimum operational performance at specific speed and application ranges.
The selected cooling concept is one of the essential factors when designing the screw compressor system. The maximum permissible operatinal temperatures, in most cases 100 °C/212°F at ambient temperatures of up to 40 °C/104°F, must not be exceeded.
The flow of heated cooling air through air ducts results in an increased resistance which must be overcome by the fans. The selected air duct cross-section should not be smaller than the entire cooler surface. If a long air duct with several bends is used an additional fan must be installed.
The less clearance there is between the fan blade edge and the inner diameter of the guide ring, the better the air output will be. All of the characteristic curves specified by us assume a clearance and a penetration depth of max. 1%.