The centrifugal fan uses centrifugal force to pump the gas into the body and then throw it out, so as to achieve the purpose of ventilation. However, in the actual situation, after many companies install the centrifugal fan, the wind will be too large when the fan is running, and the direct performance is noise. Larger, higher power, etc., what should I do if the centrifugal fan is too windy?
1. Causes of too much wind force of centrifugal fan
1. System design margin: In general, in order to avoid the subsequent serious fan load caused by the increase in production intensity, enterprises will leave enough margin in the design, which may cause centrifugal fans The wind is too strong during actual operation.
2. Poor design of piping system: The piping system of the centrifugal fan is an important part of controlling the wind pressure and wind speed. Generally, in order to control the air volume of the fan, a deflector is set inside the pipe, and the size of the air outlet is set at the position of the air outlet. The device, without it, the fluid would pass directly through the inside of the fan, increasing the speed of the impeller and causing too much wind.
3. Power supply voltage fluctuation: If the power supply voltage of the centrifugal fan fluctuates, it will directly cause the speed of the fan to change, and then the wind force will change, resulting in too much wind, and the centrifugal fan without frequency converter will be more obvious.
2. The method of reducing the wind power of centrifugal fan
1. Properly adjust the rotational speed: The rotational speed of the centrifugal fan is one of the main conditions for determining the wind power. The rotational speed of the fan can be controlled by increasing the frequency converter or using a variable frequency motor. When the wind is too strong, the rotational speed can be reduced Can effectively reduce wind.
2. Increase the resistance of the pipe network: Reducing the size of the fan outlet can increase the resistance of the pipe network system, thereby reducing the wind power of the fan. In addition, adding a deflector in the pipe can reduce the airflow in the pipe The pressure and speed of the centrifugal fan can also be reduced.
3. Replacement of small fans: If all the wind limiting measures have been used, but there is still excessive wind, then it is necessary to consider replacing a smaller centrifugal fan, because the power of the large fan It consumes more electricity and consumes more electricity. If it is not fully utilized, it is better to replace it with a smaller one.
3. The method of adjusting the wind power of centrifugal fan
1. During the test run of the centrifugal fan, you should read the product manual carefully, check whether the wiring method is consistent with the wiring diagram, carefully check whether the working voltage of the power supply to the fan meets the requirements, whether the power supply is out of phase or in the same phase, and the capacity of the electrical components to be distributed. does it reach the requirement.
2. Start at low speed first to check whether the rotation direction is correct; when starting at high speed, wait for the centrifugal fan to stop before starting it, so as to avoid high-speed reverse rotation, which may cause the switch to trip and the motor to be damaged.
3. When the centrifugal fan reaches the normal speed, it should be measured whether the input current of the fan is normal, and the running current should not be greater than its rated current. If the running current is greater than its rated current, check whether the supplied voltage is normal.
4. When the air inlet of the centrifugal fan is fully opened, the power required is relatively large. If the air inlet is fully opened for operation, not only the wind force is easy to be too large, but also the motor is at risk of damage.
5. The valve on the inlet or outlet pipe should be closed as far as possible before the centrifugal fan is put into operation. After the operation, the valve should be gradually opened until the required wind power is reached, and the operating current should be paid attention to whether it is greater than the rated current.
