Bifurcated Axial Fan

Product Description

Ideal for environments where the air may contain dust or moisture
RHF Fans supply two types of bifurcated fan, the HD bifurcated fan and the LD bifurcated fan. Where high pressures are required, swollen casings are used to allow larger frame sizes to be fitted, 250 - 1500mm diameter.

HD bifurcated fan
With these arrangements, the motor sits in a tunnel which is isolated from the air stream. This tunnel passes all the way through the casing, which allows unrestricted air movement for motor cooling. This is of particular importance for higher-temperature applications. The impellor is mounted onto a precision machined extension shaft, which in turn is mounted onto the motor shaft. Shaft seals are fitted to prevent dust ingress and minimise air leakage into the motor tunnel. These seals are not gas-tight and can be affected by condensation, corrosive chemicals or abrasive materials. Please refer to RHF if special seals are required.

The middle section of the fan casing is enlarged to minimise airflow restriction. Coned ends have been carefully proportioned to give a smooth flow from the impellor barrel right through the casing. The use of one-piece spinning for the cone ends ensures accuracy and smooth aerodynamic transitions. These spun cone ends are made from a minimum of 3mm thick steel and are used on all sizes, regardless of whether the casing construction is in mild steel or stainless steel.

Ancillaries such as spigot flanges, inlet bellmouths, casing feet, and flexible connections are also available. RHF can offer nonstandard arrangements and special fans.
LD bifurcated fan
With these arrangements, the motor sits in a tunnel which is isolated from the air stream. This tunnel passes all the way through the casing, which allows unrestricted air movement for motor cooling. This is of particular importance for higher-temperature applications. The impellor is mounted onto a precision machined extension shaft, which in turn is mounted onto the motor shaft. Shaft seals are fitted to prevent dust ingress and minimise air leakage into the motor tunnel. These seals are not gas-tight and can be affected by condensation, corrosive chemicals or abrasive materials. Please refer to RHF if special seals are required.

This particular fan consists of a cylindrical casing, which is less expensive than the HD type. The flow losses encountered with this design are naturally higher than those experienced with the HD type due to greater restriction of free area. Notwithstanding the restriction, good performance can be achieved with a small penalty on absorbed power.

Ancillaries such as spigot flanges, inlet bellmouths, casing feet, and flexible connections are also available. RHF can offer nonstandard arrangements and special fans.