前弯叶片离心风机运行速度相对较低，通常适用于大风量、低静压的工况。典型的流量范围为30%-80% WOCMS(全敞口流量),最高的静压效率为60%-68%，通常发生于静压最大值的稍右侧。功率曲线具有增加的倾向，是“易过载型”风机。前弯叶片离心风机的优点是造价低、转速低，可选用较细的轴和较小的轴承，且具有较宽的操作范围。缺点是性能曲线形状可能与管网阻力曲线平行，且系统静压降低可能导致电机过载。另外，叶片结构强度较低，不能运行于较高的转速。
The centrifugal fan with forward curved blades operates at a relatively low speed and is usually suitable for high air volume and low static pressure. Typical flow range is 30% - 80% WOCMS (full open flow). The highest hydrostatic efficiency is 60% - 68%, which usually occurs on the slightly right side of the maximum hydrostatic pressure. The power curve has a tendency to increase, and it is an "easy overload" fan. The advantages of forward-bending blade centrifugal fan are low cost, low rotating speed, the choice of finer shaft and smaller bearings, and a wide operating range. The disadvantage is that the shape of the performance curve may be parallel to the resistance curve of the pipeline network, and the reduction of the static pressure of the system may lead to overload of the motor. In addition, the blade structure strength is low and can not run at a higher speed. 1、下降部件之间抵触
1. Conflict between falling parts
轴承间和齿面间之间做着互相运动，在外表参与润滑油的作用，就是将抵触面离隔，来下降部件之间的抵触力，前进机械设备的成效。
Between bearings and tooth surfaces, there is mutual movement, which participates in the role of lubricating oil on the surface, that is, separating the contact surface to reduce the resistance between components and advance the effectiveness of mechanical equipment.
2、减少磨损
2. Reduce wear and tear
在轴承或齿面间的润滑油能下降抵触载荷，然后减少设备的磨损。
Lubricating oil between bearings or tooth surfaces can reduce the resistance load, and then reduce the wear of equipment.
3、冷却
3, cooling
由于轴流风机的作用，设备处于长时间的作业，外表温度必定高热，添加润滑油就是能减低设备的抵触发热。
Because of the role of the axial flow fan, the equipment is in a long period of operation, the external temperature is bound to be high heat, adding lubricant is able to reduce the device's anti-trigger heat.
4、防腐
4, anticorrosion
处于室外，长时间会导致设备的外表出现锈蚀，添加润滑油能够隔绝空气、腐蚀气体等现象。
Being outdoors for a long time will lead to rust on the surface of the equipment. Adding lubricating oil can isolate air and corrosive gas.
