Centrix Version 3. Advanced Centrifugal Fan selection software. Version 3 Now with CAD drawings: Centrix is a centrifugal fan selection program that enables a fan manufacturer to select, design, cost and quote fans for applications. This program does in a couple of minutes what an experienced fan engineer would take many hours to design and cost! Over View: Selects fans from a range of designs to suit a volume and pressure.
Plots Performance Curves. Calculates noise levels.
Designs Silencers. Mechanically designs and calculates stresses. Produces detail and arrangement drawings. Automated Drawings generation saved as Autocad dwg files. Produces Autocad cutting profiles for the main components.
Manufacturing industries of fans and blowers seldom followed optimum design solution for individual fan/blower. Mostly their design and fabrication is based. 3.3.1 Design of Impeller. Chapter – 3: Centrifugal Fan Design Methodologies.
Estimates the costs, areas, weights and labour hours. Produces a handing specific General Arrangement drawing. Produces a quotation document. Centrix Does not: Design the aerodynamic proportions. The aerodynamic proportions must be known and entered into the Centrix database. Centrix uses these proportions and designs a range of fans by manipulating the fan laws. Screenshots Description Aerodynamic designs and a nominal range of sizes are entered into the program by H & R Resources.
These designs are usually provided by the purchaser. H & R Resources can provide fan aerodynamic design criteria if required. The aerodynamic design is what gives a particular fan its volume, pressure and power characteristics.
A single aerodynamic design can meet any volume and pressure that you can think of but the size or speed may not be practical due to mechanical limitations (size outside the range or speed outside the range). The mechanical design must consider: a) Impeller stresses - dependent on speed, temperature, thickness and material selection. B) Casing thickness - dependent upon fan diameter, pressure and noise breakout. C) Shaft design - dependent upon impeller weight, belt or coupling load, motor torque, fan arrangement, temperature etc. D) Bearing selection - dependent on shaft size and loads and rpm. C) Pedestal design - dependent on fan diameter, power and rpm. Centrix selects a standard size of aerodynamic design and calculates all the above factors (and more).
For example a particular fan selection may not be suitable for belt drive because the bearings can't take the load and larger bearings can't be used because of rpm limitations. However the same fan could be direct coupled arrangement 8 with no problems due to the much lower load. Also Arrangement 7 shaft and bearings can often be used when an arrangement 8 shaft can't. Shaft critical speed is easily calculated by Centrix. If you have ever been unable to balance a fan in service and it vibrates like crazy then you probably have a shaft critical speed problem. Did you know that in overhung fans (arrangements 1, 2, 8, 9) the shorter the distance between the bearings the higher the critical speed is and the larger the impeller overhang from the inboard bearing the lower the critical speed is.
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