Auto -variable®, controllable pitch, or variable pitch are words usually used to describe axial fans with blades that change pitch in operation, so that the precise amount of airflow is furnished to meet the requirements for a particular heat exchanger or cooling tower.

A variable pitch fan is similar in concept to that of a variable-pitch propeller and involves progressively reducing the pitch (or blade angle) of the fan on a turbofan as the engine is throttled. Although variable pitch fans are used in some industrial applications, the focus of this article is on their use in turbofan engines .

Variable pitch axial fans combining the highest efficiency levels available today with an exceptionally flexible, customer focused design. The Variax and PF fans are proven across a wide range of applications within mining, power, metals and wind tunnels.

Single stage PFS fans are capable of delivering volumes of 1000m3/s at up to 15 kPa. They incorporate oil-lubricated primary air (PA), induced draught (ID) and.

Axial-flow fans with impeller bla-des adjustable under load have been designed and built for ther-mal power stations for about 30 years.

This paper investigates the mechanical design of an axial fan with automatically controlled variable pitch blades, fo-cusing on kinematic and dynamic synthesis of the fan. In addiction it is presented a case of an axial-flow fan with 16 adjustable blades able to …

The VARIAX® variable pitch axial fan combines one of the highest efficiency levels available today with an exceptionally flexible, customer focused design, manufacturing and aftermarket service. The VARIAX® is designed and engineered by Howden Axial Fans, part of Howden’s Heavy Fans and Heaters Division, and

2023年5月3日 · Specifications of variable pitch & axial fans include up to 81 1/8 in. fan sizes, 15 in. wg static pressure & 150 degrees F operating temperature. Features include rugged industrial strength construction, resettable blade angles & airfoil bladed wheels.

Sickle profile axial fans with low noise signature. F plastic fans are manufactured assembling variable pitch, slightly sickle profile blades with a light aluminum alloy hub. The fans are the best choice to suit a variety of applications which require low noise signature and high efficiency at …

ANT stands for two stage VARIAX® variable pitch axial fans. With its two stages of impeller, the ANT can handle pressure up to 30000 Pa and flow up to 1600 m3/s in the air and flue gas system with an operational temperature range up to 200°C.