Subway tunnels are filled with a lot of dust, including metal dust generated by rail friction, particles left over from construction, and dust brought in from the outside. subway tunnel fans must have good dust resistance to ensure stable ventilation and air exchange, maintain air quality in the tunnel, and ensure train operation safety and passenger health.
The structural design of the fan plays a key role in dust resistance. First, the shape and material selection of the impeller are crucial. The streamlined impeller can reduce dust adhesion, while the wear-resistant and corrosion-resistant alloy material can resist dust erosion. Secondly, the air inlet of the fan should be equipped with effective protective devices, such as fine metal filters or special air filter elements, which can prevent larger particles of dust from entering the fan and reduce the dust accumulation pressure of subsequent components. In addition, the air duct design inside the fan should try to avoid dead corners and narrow passages to prevent dust accumulation.
In actual operation, the speed, air volume and other parameters of the subway tunnel fan will affect its dust resistance. A higher speed may intensify the collision between dust and fan components and accelerate wear, but a reasonable air volume can discharge dust in time. Therefore, it is necessary to optimize the operating parameters of the fan according to the actual situation of the tunnel, and reduce the damage of dust to the fan under the premise of ensuring the ventilation effect. For example, through the intelligent control system, the fan speed can be dynamically adjusted according to the air quality and passenger flow in the tunnel.
Although the fan has a certain dust resistance, regular cleaning is still essential. The accumulation of dust inside the fan will gradually reduce the efficiency of the fan, increase energy consumption, and even affect the balance and stability of the fan, causing problems such as vibration and noise. Regular cleaning can remove dust in time, restore the performance of the fan, and extend the service life.
Physical cleaning is one of the common methods. For the protective net of the fan housing and the air inlet, a high-pressure water gun or compressed air can be used to blow to remove dust and debris on the surface. For the impeller and internal air duct, after stopping the machine, brushes, vacuum cleaners and other tools can be used to clean the attached dust. However, this method has limited cleaning effect on some hard-to-reach corners and gaps.
Chemical cleaning can be used for some stubborn dirt and oil stains. Choose a suitable cleaning agent, dilute it in a certain proportion, spray or soak the fan parts, and then rinse them with clean water. However, when using chemical cleaning agents, pay attention to their corrosiveness to the fan material to ensure that the fan structure will not be damaged. For example, for oil stains on metal impellers, weak alkaline cleaning agents can be used for treatment.
Determining a reasonable cleaning cycle requires comprehensive consideration of factors such as the dust content of the tunnel, the operating time and working conditions of the fan. Generally, the cleaning needs of the fan can be evaluated through regular performance testing and dust monitoring. At the same time, a complete fan cleaning management system should be established, including the training of cleaning personnel and the preservation of cleaning records, to ensure that the cleaning work is carried out in a standardized and efficient manner and to ensure that the subway tunnel fan is always in good operating condition.
