1. TECHNOLOGICAL ROLE
Fans are designed to increase the static pressure of a volumetric fluid flow per second Vs by a required value Δp, and eventually accelerate it at high speeds.
2. TRANSPORTED FLUID
Plastic fans can transport various types of air and gases: clean, dust-laden, corrosive, toxic, etc.
Fluid temperature must typically be lower 70 °C, but can even reach temperatures of 120 °C under suitable circumstances.
3. OPERATING RANGE
Plastic fans can generate flows of up to 140,000 m3/h at pressures of up to 5,000 Pa.
4. EQUIPMENT AND PROCESS DESCRIPTION
Each fan consists of a casing and an interior turbine driven by an electric motor.
Plastic fans are classified according to several features:
– according to construction material: standard housing and rotor are PPH, but on request can be constructed out of PVC, PEDH, PPS, PPS-el, or PVDF.
– according to propeller orientation relative to liquid flow direction: radial (centrifugal), axial, and diagonal.
– according to maximum achievable air pressure: low (below 100 mmH2O), medium (between100 and 300 mmH2O), and high and very high pressure (over 300 mmH2O);
– according to designated use: general and special use (in explosive, toxic, abrasive, corrosive, pneumatic and other special types of environment).
– according to construction model: single or double aspirator; with rotor mounted directly on motor shaft, connected to it via elastic coupling, or connected by means of a reducer (usually belt drives); single and multi-level.
– according to level of noise generated: silent and non-silent.