Fans, pumps, electrical energy-saving control cabinet 

 Fans, pumps and motors are the largest traffic demand of the design requirements to design, the adjustment method used tailgate, valves, backflow, control the machine from the power failure, can not form a closed loop control, but also more power does not consider the concept of . Electrical control direct or Y-△ starter, not a soft start function, mechanical impact of large, life is short drive, vibration and noise greater need of power capacity, power factor and low points of their main problem 

 We know, centrifugal pump and fan flow pressure and shaft power relationship between the following: 

 Flow and speed is proportional to a square. 

 Pressure (head) and is proportional to the square of speed. 

 Shaft power and speed proportional to the cube. 

 When the lower speed when the fan pump, the flow rate decreased with the ratio, but the power was decreased rapidly to the cube of speed, the relationship between them as follows: 

 Frequency Hz 50 45 40 35 30 25 20 15 

 Speed% 100 90807060504030 

 Pressure% 1,008,164,493,625,169 

 Head% 1,008,164,493,625,169 

 Flow% 100 90807060504030 

 51.2% 100 72.9 Power 12.5 6.4 2.7 34.3 21.6 

 Saving rate of 78.4% 0 27.1 48.8 87.5 93.6 97.3 65.7 

 Move 



 Cases of head m 150 121.5 96 73.5 54 37.5 24 13.5 

 Flow m3 2000 1800 1600 1400 1200 1000 800 600 

 Power kw 110 80.19 56.32 37.73 23.76 13.75 7.04 2.97 

 According to the above rules, we can draw for fans, pumps for saving transformation can make the system run under the state of the economy to achieve a reasonable energy-saving purposes. 

 2) energy conservation principle: 

 A. Contact