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一、前言离心式风机是一种广泛应用的通用机械产品。由于用户的使用条件千差万异,对风机的性能要求也就极不相同,显然,我国现有的风机系列已不能满足用户的要求,因而普遍出现大马拉小车的浪费能源的现象。例如某35吨/小时沸腾锅炉引风机,根据用户对压力和风量的要求,其轴功率大约为90千瓦,选用电机功率最多为135千瓦即可。实际上按现有风机系列选用的是Y_4-73 № 18风机,其轴功率122千瓦(用380伏190千瓦电机。实际现场电压为6000伏而选用310千瓦电机)。它表明,尽管4—73是一种效率为90％左右的高效风机,但由于
First, the preface Centrifugal fan is a widely used general machinery products. As users of the use of different conditions, the performance requirements of the fan is also very different, obviously, our existing series of fans can no longer meet the user’s requirements, which generally appear in a large horse-drawn car wasted energy phenomenon. For example, a 35 t / h boiling boiler fan, according to the user pressure and air volume requirements, the shaft power of about 90 kW, the choice of motor power up to 135 kilowatts can be. In fact, the current fan series is selected Y_4-73 № 18 fan, the shaft power of 122 kilowatts (with 380 volts 190 kilowatts motor. The actual site voltage is 6000 volts and the choice of 310 kilowatts motor). It shows that although 4-73 is an efficient fan with an efficiency of around 90%, it is due to