1. Overview of the use of water pumps
Most of the loads of production equipment in industrial enterprises are AC asynchronous motors, and the power consumption accounts for about 65% of the total power consumption of the enterprises, especially the efficiency of water pump loads is relatively low. After China joined the WTO in 2002, enterprises must to improve economic efficiency. In order to enhance competitiveness, saving electricity is an important economic link in reducing production costs. For example, in a water supply station, the water supply system is adjusted according to the demand for water consumption, and the flow is adjusted by adjusting the pump outlet valve. Special personnel are required to be on duty to switch the valve under different circumstances. The labor intensity is high. At the same time, due to the forced throttling of the valve, the pump forms a vortex impact, which produces strong vibration and noise, which increases the unfavorable loss of the service life and maintenance of the pump. Furthermore, since the torque of the electric motor is basically constant, the water supply pressure formed by this adjustment method is relatively high, causing serious throttling power loss, reducing the efficiency of the pump, and causing a waste of electric power.
2. The speed regulation performance of water pump frequency converter’s energy saving improvement
When the speed of the water pump is changed, its internal geometry does not change. Therefore, according to the similar principle of the water pump, when the speed changes, the flow rate is proportional to the speed, the lift is proportional to the square of the speed, and the shaft power is proportional to the cube of the speed. It is concluded that when the speed of the same pump changes, the main performance parameters of the pump will change according to the above proportional law, and the efficiency can be kept basically unchanged during the change process. If the speed of the water pump unit is adjustable, we can change the The speed of the water pump is adapted to the change of water demand at that time, so that the overload of the motor caused by the operation of the water pump unit in the low-efficiency area can be avoided. On the other hand, the waste caused by high water supply pressure can also be avoided. At the same time, as the speed of the water pump slows down, the shaft power is greatly reduced, and the input power of the motor is also reduced. This is the energy-saving effect of the speed-regulating water pump in the water supply system.
Post time: May-20-2023