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离心风机风量的受到哪些因素影响?怎么调节

2018-07-28 19:10:09 常州亿创钣金加工厂 阅读

 离心风机容量是按照工艺设备所需最大风量选择的,但实际生产运行时设备所需的风量时大时小。因此,根据运行所需调节离心风机的风量是实现离心风机节能运行的常用方法,通常有以下2种方式:1. 控制输入或输出端的风阀;2. 控制电动机旋转速度。
The centrifugal fan capacity is selected according to the maximum air volume required by the process equipment, but the air volume required for the actual production and operation is large and small. Therefore, adjusting the air volume of the centrifugal fan according to the operation is a common method to realize the energy saving operation of the centrifugal fan. There are usually 2 ways: 1. control the input or output wind valve; 2. control the speed of the motor rotation.

利用调节风阀的开度控制风量:在工业生产中常采用电机恒速运行,用关闭风阀来减轻离心风机负载的起动方式和调节风阀的开度控制风量。在这种调节风量过程中,电机轴功率与风量成正比。
By adjusting the opening of the wind valve, the constant speed of the motor is often used in industrial production, the starting mode of the load of the centrifugal fan is reduced and the open control air volume of the wind valve is adjusted by the closure of the wind valve. In the process of adjusting the air volume, the shaft power of the motor is directly proportional to the air volume.

采用调节风阀来控制风量方法的优点是初期投资少、控制简单,是工业生产中一直沿用的方法。但其缺点是在调节风阀来控制风量时,离心风机设备的运行效率显著降低,功率损耗大,节能效果不明显。
The advantage of adopting the adjusting air valve to control the air volume method is that the initial investment is few and the control is simple. It is a method that has been used in industrial production. But the drawback is that when adjusting the air valve to control the air volume, the running efficiency of the centrifugal fan equipment is significantly reduced, the power loss is large, and the energy saving effect is not obvious.

利用调速控制风量:利用控制离心风机拖动电动机转速来调节风量的节能原理是基于风量、压力、转速、转矩之间的关系,风量与转速成正比,电机轴功率与转速的立方成正比。当通风系统仅需要一半风量时,可将电动机转速降低50%,此时电机输出功率只有12.5%。采用控制转速控制风量,使功率损耗最低,节能效果相当可观。
The principle of energy saving by controlling the speed of the centrifugal fan to adjust the speed of the motor is based on the relationship between the air volume, pressure, speed and torque, and the air volume is proportional to the speed, and the power of the motor shaft is proportional to the cube of the speed. When the ventilation system only needs half of the air volume, the motor speed can be reduced by 50%, when the output power of the motor is only 12.5%. By controlling the speed and controlling the air volume, the power loss is minimized and the energy saving effect is considerable.

采用转速控制风量的节能方法节能效果很理想。电机交流调速方式有多种,例如变极调速、定子电压调速、变频调速等。随着变频技术的发展和普及,变频器产品高性能,采用变频器调速实现离心风机的节能开始逐步取代风阀控制的方案。

The energy saving effect of the speed control air volume is very good. There are many ways of motor AC speed regulation, such as pole changing speed regulation, stator voltage speed regulation, frequency conversion speed regulation and so on. With the development and popularization of frequency conversion technology, the inverter product has high performance, and the energy saving of centrifugal fan is gradually replaced by the frequency converter to realize the control of the wind valve gradually.



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