The Cleanfix reversible fan changes airflow direction not by reversing rotation, but by rotating each of its nine blades 180 degrees, thus changing the pitch of the blades and reversing airflow.
Reversible fans can reduce maintenance and related downtime—as well as help avoid the potentially costly consequences of overheating—by periodically directing a reverse blast of air through radiators, oil coolers, air-conditioner condensers, and intake screens to purge debris. Most reversible fans accomplish this task by changing direction of rotation.
The Cleanfix reversible fan, however, changes airflow direction not by reversing rotation, but by rotating each of its nine blades 180 degrees, thus changing the pitch of the blades and reversing airflow. According to Cleanfix, changing blade pitch, instead of reversing direction of rotation, ensures that the reverse airflow stream is as powerful as the cooling blast, thus optimizing both cooling and cleaning performance.
Cleanfix fans use a patented pneumatic cylinder, working through eccentric linkage within the fan’s hub, to rotate each blade on its individual axis. A small 12/24-volt air compressor supplies the required actuating air, and the blades return to their cooling position via spring force. Blade pitch can be changed at any engine speed.
An optional electronic control module allows automating the cleaning process, which will then take place at selected intervals. The standard system requires the machine operator to initiate the cleaning process with an in-cab button, but in either instance, the operator can cancel the process with the touch of a button.
The new VP-Series fans add a thermal control feature, which allows the fan blades to rotate through an arc of 18 degrees when in the cooling mode. This feature, says Cleanfix, permits the fan to produce only the airflow required to maintain operating temperatures, thus saving horsepower and fuel when engine/fan speed is high, but cooling requirements are minimal. A small thermal element at each blade’s base contains an elastomer that can compress as fan speed increases, thus adjusting blade pitch.