The work characteristics and research of improving axis flow
Due to the particularity of the internal structure of the bearing fan, it is necessary to conduct research based on its internal structure in order to better improve and upgrade and develop better bearing fans!The axial flow fan is the main ventilation equipment of the mine.Almost all the axis flowers have a hump area, and the pressure decreases and increases as the air volume decreases.The existence of the hump district reduces the scope of the fan by more than 35%, causing serious waste of equipment resources and serious safety hazards of the fan itself.Especially as the main fan of coal mines, with the mining of coal mines, the ventilation resistance of coal mines has increased, and the operating conditions are easy to fall into the hump area.The formation of this typical feature can be explained by the flow of airflow in the ventilator under four different working conditions.
1. The structure of the gas separation device
When running in the hump area, the wind pressure and air volume changes instantly, and the size of the size is mutated. Entering the unstable working area, it is manifested as the noise of the axis fans, and the vibration is violent.In severe cases, the leaves break and the fan is damaged.The main reason is that when the axis fans are running in the hump district, the air flow of the fan is distorted before entering the blade channel, generating vortex and reverse flow.With the expansion of the vortex and inverse current area, the axial flow fan cannot work properly.Therefore, in order to ensure the stable operation of a shaft fan in the hump district, one of the effective methods is to transform the traditional fan structure and add a device (called a gas separator or stabilizer) in front of the fan blade.It consists of a separator shell, a splitter and a diversion ring.
2. The working principle of the gas separation device
EssenceAfter the edge of the vortex is rectified, leave the leaves to form a constant cycle, and then enter the main airflow of the fan.On the one hand, the air volume of the fan is increased; on the other hand, the twisted airflow isolates the airflow, weakening the energy of the vortex, so that the twisting air flow entering the blades will not produce vortex and inverse flow, eliminate the vortex and inverse flow area, or weaken, thereby improving the characteristics of the fan characteristicsThe unstable area of ??the curve achieves the purpose of the fan characteristic curve "no camel".