Tunnel Fan

1. Industrial Background

Tunnel fan is a special axial flow fan, which is mainly used in the longitudinal ventilation system of highways, railways and subways. When the tunnel fan is running, part of the air in the tunnel is sucked from one end of the fan, and after being accelerated by the impeller, it is ejected at high speed from the other end of the fan. This part of the high-speed airflow with high kinetic energy transmits energy to other gases in the tunnel, resulting in a pressure rise that overcomes the resistance of the tunnel, thus pushing the air in the tunnel to flow in the direction of the jet airflow of the winder.

However, because tunnel fans mostly adopt soft starter, the starting current of the motor is 5-7 times of the rated value, which not only causes large losses, but also has great impact on the power grid, such as mechanical wear and vibration. Moreover, using soft starter has the following disadvantages:

• The power frequency cannot be adjusted, so it is impossible to start clicking from zero voltage and zero frequency, and it is impossible to achieve zero impact start.
• Soft start cannot regulate the speed.
• Soft start exits the system after starting the motor and loses the protection function.

Compared with soft starter, the inverter has greater advantages. After starting with inverter, the tunnel fan has the characteristics of soft start, soft stop and optimized motor starting mode. Minimize the impact on the electrical components, mechanical components and connecting mechanisms of the fan during the start-up process, enhance the reliability and stability of the entire air supply system, reduce the maintenance cost of the fan, prolonging the service life of the fan. The fan adopts frequency conversion control, which has accurate air volume and air pressure control capabilities, and realizes continuously variable speed. The motor speed department adjusts the speed, torque and output power according to the construction environment, thereby greatly improving the working performance of the fan. Reduce the mechanical noise and electromagnetic noise generated when the fan is working, and improve the working environment of users. After using the inverter, in addition to various control functions, protection functions, etc., the most important thing is the super power saving effect.

Inverter is a mature high-tech product, which has high economic and social benefits. It has the characteristics of flexible start, real-time speed regulation, smooth operation, stable performance, convenient operation, and significant energy-saving effect. In the era when the country vigorously promotes low-carbon and environmental protection, this product is an ideal upgrade for ventilation of highways, railways, hydraulic tunnels and underground projects environmentally friendly products.

2.Parameter Settings

3.Photos at Site