Fan Pump Water Saving Reform

Fans and pumps are the most widely used equipment in the industrial field, and the motor power is large. In China, the largest user of electrical energy is a motor, which accounts for about 50% of the total consumption. Among them, fans and water pumps consume 30% of all electric energy. The adjustment of air flow and water flow of traditional fan pumps is based on dampers and valves. When the demand for air volume and water volume increases, the dampers and valve opening increase. The adjustment method is simple and easy, but it is to increase the loss of the pipe network, and consume a lot of energy at the expense of dampers and valves. In the usual design, the design capacity of the motor with which the user is equipped must be much higher than the actual design. That is, the phenomenon of large horse-drawn cars, resulting in a great waste of energy. In recent years, with the development of electric power and electronic technology, the frequency conversion technology has become more and more sophisticated, and the frequency conversion of fans and pumps has been recognized by the majority of customers.

First, the high-speed energy-saving principle of fans and pumps can be known from the fluid mechanics: the air volume Q is proportional to the primary speed of the speed, the pressure H is proportional to the square of the speed, and the power P is proportional to the cube of the speed.

That is: Q=K1n H=K2n2 P=K3n3

It can be known from the above formula that if the efficiency of the fan is certain, the speed can be decreased in proportion to the decrease in the amount of water that is required to be adjusted. At this time, the output power of the shaft of the fan is decreased by the established relationship.

According to the characteristic curve of the pump and the water resistance characteristic curve, the energy saving effect of the fan and the water pump can also be clearly seen. The figure above shows the speed and energy saving principle of the fan and water pump. The figure shows the H/F (Q) curve. It intersects with the wind resistance characteristic curve R1 at point A. The corresponding air flow is Q1. At this time, the output power of the shaft is proportional to the area SAH2OQ1. To reduce the air volume from Q1 to Q2, the first method is the traditional method using baffles or valves. The new wind resistance water resistance curve intersects at point B. At this time, the output power of the shaft is proportional to the area SBH1OQ2. , Reduce the speed of the pump or fan, and the corresponding H/Q curve intersects with R1 at point C. At this time, the output power of the shaft is proportional to the area SCH3OQ2. If the required air volume is reduced by 20%, the corresponding motor speed is reduced by 20%. The actual speed is 80%, then (0.8) 3≈51%, and the energy saving is up to 50%.

Second, the conclusion uses the exchange frequency conversion governor to carry on the transformation to the air blower water pump, the operation is simple, is convenient. The energy-saving effect is very significant and can be highly automated. For example, the PID temperature control of the air-conditioner fan, the constant-pressure air supply of the air compressor, and the constant-pressure water supply in the intelligent building can achieve better results.