Direct-connected fans and belt-type fans are two different fan transmission methods, and there are the following differences between them:
1. Transmission method: Direct-connected fans are directly connected to the impeller through the motor, without the use of belts or transmission devices. Belt-type fans connect the motor to the impeller through a belt.
2. Simple structure: Direct-connected fans have a relatively simple structure because they have no transmission device, and the impeller is directly driven by the motor. Belt-type fans require additional transmission devices, such as pulleys and belts, making the structure relatively complex.
3. Efficiency: Direct-connected fans are more efficient because they do not have energy conversion in the transmission device, and can provide higher air volume and pressure. Belt-type fans have slightly lower efficiency than direct-connected fans due to the energy loss of the transmission device.
4. Maintenance and adjustment: The maintenance and adjustment of direct-connected fans are relatively simple because there is no transmission device that needs maintenance and adjustment. Belt-type fans require regular inspection and replacement of belts, and maintenance work such as belt tension adjustment.
5. Noise: Direct-connected fans generally have lower noise because there is no friction noise generated by belt transmission. Belt-type fans have friction and vibration between the belt and the wheel, which may generate certain noise.
6. Adaptability: Due to the existence of the transmission device, belt-type fans have greater flexibility and adaptability, and can adapt to different combinations of motors and impellers. Due to the direct connection, direct-connected fans have relatively poor adaptability.
According to the specific application requirements and environmental conditions, the choice of direct-connected fans or belt-type fans needs to consider the above factors comprehensively to ensure that the fan can operate normally and meet the requirements.