Dynamic balancing of fans
We focus on non-disassembly balancing of fan rotors. We balance transport fans and exhaust radial fans. We specialize in balancing fans in filtration systems directly at clients, in a non-disassembled manner.
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What is a fan rotor imbalance?
An imbalance occurs in fan rotors, where the axis of the center of gravity is not the same as the axis of rotation of the fan rotor. The centrifugal force of the unbalance is transmitted via the bearings of the rotor or motor shaft to the fan housing and the whole assembly thus vibrates. The vibrations not only cause an increased load on the bearings, motor and fan housing, where they can be damaged, but also increase the noise of the fan during operation.
Why does a balanced fan suddenly start to vibrate?
A sudden increase in fan vibration is an indication of damage to the fan rotor, such as mechanical damage to the fan blade, cracking of the blade weld, or damage to the fluid being conveyed. It is the damage to the transported medium that often occurs in transport fans, where both air and particles of the extracted material are transported by the fan. Material stickers may form on the fan rotor, which can cause the fan to vibrate.
What is the advantage of non-dismantling fan balancing?
The advantage of non-disassembly balancing of fan rotors is dynamic balancing of the whole rotating system motor + shaft + fan rotor. The second indisputable advantage of non-disassembly balancing is the saving of time and work and the associated saving of investment costs for machine repair.
How does balancing work in practice?
The service technician will first secure the fan against starting to ensure its safety. Performs a physical inspection of the fan rotor and removes stuck dust on the rotor blades. He glues a reflective tape to the rotating part, which serves to sense the rotor speed and at the same time determines the angle to which the imbalance will be calculated. The technician will also place the speed sensing sensor and the vibration sensor on the proximal bearing of the fan rotor. The first time the fan is spun at operating speed, the balancer reads data about the size and angle of the imbalance to the reflective tape. Before the second measurement, a weighing weight of exact weight is installed at a defined angle. Thanks to this intentionally installed unbalance, the vibration is affected and the balancing program automatically calculates the exact angle and size of the weights that need to be drilled, riveted or welded to the fan rotor. Subsequently, the third rotation of the system, the so-called control measurement. When it comes to balancing according to the plan, it is enough to turn the fan three times for good balancing of the rotor.
The result of balancing the fans
From the balance, a protocol is written that accurately describes the input values of the imbalance, the weights used and the residual level of the imbalance.
Prevention against high vibrations
We recommend performing regular service vibration diagnostics of each fan at least once a year. We will be glad if you contact us.