Magnetic pump composition and structure characteristics

Magnetic pump (magnetic drive pump) mainly by the pump head, magnetic actuator (magnetic cylinder), motor, connecting the backplane and other parts of several components. Magnetic pump Magnetic drive by the outer rotor, the inner rotor and the non-magnetic isolation sleeve composition When the motor drives the outer rotor rotation, the magnetic field can penetrate the air gap and non-magnetic material, driven by the impeller with the inner rotor for Synchronous rotation, synchronous power transmission to achieve non-contact, easy to leak of the dynamic seal structure into zero leakage static seal structure. As the pump shaft, the inner rotor is completely closed by the pump body and isolation sleeve, thus completely solving the problems of running, running, dripping and leakage, and eliminating the problems of inflammable, explosive, toxic and harmful media in the refining and chemical industries through the pump seal Leakage of security risks. 1. Permanent magnets Permanent magnet made of rare earth permanent magnet has a wide range of operating temperature (-45-400 ℃), high coercive force and good anisotropy in the direction of magnetic field, and will not demagnetize when the same pole is close Phenomenon, is a good source of magnetic field. 2. Isolator Sleeve When using a metal isolator, the isolator is in a sinusoidal alternating magnetic field that induces eddy currents and converts it into heat in a cross section perpendicular to the line of magnetic force. The eddy current is given by: where Pe-eddy current; K-constant; n-pump rated speed; T-magnetic drive torque; F- pressure inside the spacer; D- spacer inner diameter; resistivity of a material; Tensile strength. When the pump is designed, n, T is given conditions, to reduce the eddy current only from F, D and other considerations. Selection of high resistivity, high strength non-metallic materials made isolation sleeve, the effect of reducing eddy current is very obvious. 3. Cooling fluid flow control Pump operation, you must use a small amount of liquid on the inner rotor and the isolator sleeve between the annular region and the sliding friction bearing pair was washed and cooled. Coolant flow is typically 2% to 3% of the pump design flow, and the annulus area between the inner magnet rotor and the isolation sleeve generates high heat due to eddy currents. When the cooling fluid is not enough or flushing hole poor, blocked, it will lead to the medium temperature is higher than the permanent magnet operating temperature, the magnetic rotor gradually lost magnetism, the magnetic actuator failure. When the medium is water or water-based liquid, the annulus area can be maintained at 3-5 ℃. When the medium is hydrocarbon or oil, the annulus area can be maintained at 5-8 ℃. 4. Slide bearing magnetic pump sliding bearing materials impregnated graphite, filled with PTFE, engineering ceramics. As a result of engineering ceramics has a very good heat, corrosion-resistant magnetic pump, abrasion resistance, so the use of magnetic bearings multi-purpose sliding bearing engineering ceramics. As the engineering ceramics are very brittle and the expansion coefficient is small, so the bearing clearance must not be too small, in order to avoid the occurrence of axial accidents. As the magnetic pump sliding bearings to the lubrication of the media, it should be based on different media and the use of conditions, the use of different materials made of bearings. 5. Protection When the driven parts of the magnetic actuator operate under overload or the rotor is stuck, the main and driven parts of the magnetic actuator will automatically slide off to protect the pump. In this case, the permanent magnet on the magnetic actuator will generate eddy loss and magnetic loss under the action of the alternating magnetic field of the active rotor, causing the temperature of the permanent magnet to rise and the magnetic actuator to slip off.

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