At present, roots blowers, submerged blowers, centrifugal blowers, magnetic levitation blowers are commonly used in sewage treatment plants. As a new type of blowers, magnetic levitation blowers are the new trend of future development.
Maglev centrifugal blower is a kind of single-stage high-speed centrifugal blower, which generally adopts the integrated structure of high-speed motor, frequency converter and magnetic bearing. The motor omits the intermediate mechanical speed increasing device such as gear and coupling, the output shaft is directly connected with the impeller, and the output parameters such as air volume and air pressure are automatically adjusted. There is no mechanical contact in the middle, and no oil lubrication system is required. The standard configuration includes high-speed motor, frequency converter, oil-free magnetic bearing, vent valve, local control, safety monitoring system and acoustic enclosure. All its components are integrated and installed on the common base without special fixed foundation, so the equipment is small in size, light in weight, easy to install and operate, and low in noise and vibration free control noise is less than 80dB during operation.
Magnetic bearing and permanent magnet synchronous motor are the core technologies of magnetic suspension single-stage centrifugal blower. The magnetic bearing applies the principle of constant magnetic induction, realizes the high-speed and stable non friction operation of the rotor shaft with electromagnetic suction. At the same time, it uses position sensor, power amplifier and PI arithmetic to detect the real-time state, diagnose the fault and adjust the motor rotor shaft. Its active control ability can effectively restrain the unbalanced vibration of the rotor shaft, and it also has complete and strict power-off protection Measures. Permanent magnet synchronous motor has the advantages of simple structure, small size, light weight, high efficiency and energy saving. It is gradually replacing the small and medium power DC motor, asynchronous motor frequency conversion speed control system magnetic suspension single-stage centrifugal blower in China, which has been used well and does not reduce efficiency with the passage of time. Although the cost of equipment is high, there is almost no maintenance cost, and long-term operation can save a considerable amount of electricity.
At present, the rated air volume of the largest type of single-stage magnetic suspension centrifugal blower is about 205m3 / min, the pressure rise is 75kpa, the general air volume can reach 170m3 / min, the air pressure is 35-120kpa, and the exhaust volume of the blower can be adjusted at 50% - 100% through frequency conversion and speed regulation, and the magnetic suspension blower can basically meet the use of the sewage plant.
Application scope of magnetic suspension centrifugal blower:
Maglev centrifugal blower has the advantages of high efficiency, energy saving, low noise, no vibration, etc., and high one-time investment cost. However, saving power consumption and maintenance cost in the long-term operation process is the main development direction of sewage treatment industry in the future.