Permanent magnet bearing centrifugal pump is available, domestic independent research and development
Recently, a new type of permanent magnet bearing centrifugal pump was successfully developed in Jiangsu University. Since the rotor has no mechanical contact and friction with the pump body, the vibration and noise of the device are low, and the measured noise in the model test is less than 40 decibels. Researchers have been invited to present the study at the 13th International Conference of Magnetic Bearings Society in the United States in October.
According to Qian Kunxi, a professor at the National Pump and System Engineering Technology Center of the school, this innovative device driven by a common three-phase AC motor through magnetic coupling has broken through the traditional machinery of “no shaft, no shaft, no shaft bearingâ€. Rotating concept and mode, the rotor has no rotating shaft and no tangible bearing. The shape of the impeller is like an alien flying saucer. It is fully suspended and stably rotated under the action of pure permanent magnet force.
Qian Kunxi said that the biggest advantage of permanent magnet bearings is that they can solve the durability problem of mechanical bearings. The permanent magnet bearing centrifugal pump has no mechanical wear, no lubrication and sealing, and has a long service life.
The test with clear water as the medium shows that the proper adjustment of the force of the permanent magnet force is balanced with the fluid force, and the permanent magnet bearing centrifugal pump can achieve a stable balance, which indicates that the permanent magnet suspension technology can achieve stability under dynamic conditions. .
Relevant experts said that the successful application of permanent magnet bearings on centrifugal pumps, permanent magnet bearing centrifugal pump shows the feasibility, reliability and repeatability of permanent magnet suspension technology, and has broad application prospects in the fields of national defense and biomedical engineering.
Do not use ball bearings to turn. The world's first permanent magnet bearing centrifugal pump, which uses permanent magnet suspension technology to make it stable, has been successfully developed at Jiangsu University. This invention challenges the traditional mechanical rotation concept of "no shaft, no shaft, and must have bearings", and proves that the permanent magnet suspension technology that the scientific community considers "unstable" is "stable" under dynamic conditions.
The newly developed permanent magnet bearing centrifugal pump has only a rotor, no rotating shaft and a shaped bearing, and the function of the invisible bearing is achieved by the action of the permanent magnet. Researchers say that the permanent magnet force comes from the force between the two magnets. The inner ring of the bearing is fixed to the impeller, and the outer ring is fixed to the stator. The rotor of the motor does not come into mechanical contact with the stator. The permanent magnet force is repelled by the same pole and the principle of mutual attraction, and the permanent magnet force generated by mutual reciprocation causes the rotor to achieve a suspension effect.
This kind of permanent-magnet bearing centrifugal pump widely used in industry, agriculture, medicine and other industries, the shape of the impeller is like a flying saucer, and it is fully suspended in 5 degrees of freedom under the support of permanent magnet force. A disk is fastened to the shaft end of the motor to attract another disk fixed in the pump body to rotate on the impeller. The rotation of the impeller drives the rotation of the liquid inside, generating centrifugal force. When the fluid reaches the outer circumference of the impeller, the flow rate is high, and the speed is lowered when flowing out of the centrifugal pump. Part of the kinetic energy of the fluid is converted into pressure energy, thereby completing the process of transporting the liquid.
Experiments have confirmed that a permanent magnet bearing centrifugal pump without a rotating shaft and a mechanical bearing can also deliver liquid. It shows that the shaft and bearing in the traditional centrifugal pump are not indispensable. Researchers say that the stable suspension and rotation of the impeller of a permanent magnet bearing centrifugal pump must be achieved when the combined force of all permanent magnet forces and the fluid force are balanced.
According to Qian Kunxi, a professor of the invention and a professor at Jiangsu University, the permanent magnet bearing centrifugal pump has three major advantages. First, there is no mechanical contact between the rotor and the pump body and friction noise is small. Second, there is no mechanical wear inside the permanent magnet bearing centrifugal pump. Lubrication and sealing, no downtime repair and maintenance, can run indefinitely; Third, the application of permanent magnet bearings makes the centrifugal pump smaller, more energy efficient and more versatile.
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