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What aspects should be understood when selecting a two-leaf fan?
Release time:
2021-04-22
The working principle of the fan is basically the same as that of the turbocompressor, but due to the lower gas flow rate and minimal pressure changes, the variation in gas specific volume generally does not need to be considered, treating the gas as an incompressible fluid.
First, you need to understand the following points:
1. The working principle of the two-blade fan:
The working principle of the fan is basically the same as that of a turbo compressor, but due to the lower gas flow rate and minimal pressure changes, the variation in gas specific volume is generally not considered, treating the gas as an incompressible fluid.
2,Two-blade fanClassification:
(1) The classification of Roots fans can be divided into centrifugal, axial, oblique flow, and cross flow types based on the direction of gas flow.
(2) Fans are classified based on the flow direction of the air entering the impeller into: axial fans, centrifugal fans, and oblique (mixed flow) fans.
(3) Fans are categorized by Applications into pressure-in local fans (hereinafter referred to as pressure-in fans) and explosion-proof motors placed outside the flow path or inside the flow path, with explosion-proof motors placed in explosion-proof sealed chambers of extraction local fans (hereinafter referred to as extraction fans).
3. Fan performance parameters
(1) The performance parameters of Roots fans mainly include flow rate, pressure, power, efficiency, and speed. Additionally, noise and vibration levels are also major design indicators for fans.
(2) Flow rate, also known as air volume, is expressed as the volume of gas passing through the fan in a unit of time;
(3) Pressure, also known as wind pressure, refers to the increase in pressure of the gas within the fan, which can be divided into static pressure, dynamic pressure, and total pressure;
(4) Power refers to the input power of the fan, i.e., shaft power. The ratio of effective power to shaft power is called efficiency. The total pressure efficiency of the fan can reach 90%.
4. The future of fans
The development of Roots fans will further improve the aerodynamic efficiency, device efficiency, and usage efficiency of fans to reduce electricity consumption; replace large centrifugal fans with adjustable blade axial fans; reduce fan noise; enhance the wear resistance of smoke and dust exhaust fan impellers and casings; and achieve variable speed adjustment and automation.
Key words:
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