Working principle of magnetic pump

Magnetic pump (magnetic drive pump) is mainly composed of several parts such as pump head, magnetic actuator (magnetic cylinder), electric motor, and connecting base plate. The magnetic drive of the magnetic pump consists of an outer magnetic rotor, an inner magnetic rotor, and a non-magnetic isolation sleeve. When the motor drives the outer magnetic rotor to rotate, the magnetic field can penetrate the air gap and non-magnetic substances, driving the inner magnetic rotor connected to the impeller to rotate synchronously, achieving non-contact synchronous transmission of power and transforming the easily leaking dynamic sealing structure into a zero leakage static sealing structure. Due to the pump shaft and inner magnetic rotor being completely enclosed by the pump body and isolation sleeve, the problem of "running, emitting, dripping, and leaking" has been completely solved.The main magnetic pump product names of China magnetic pump Network include:CQ type engineering plastic magnetic-driving pump，CQ type magnetic-driving pump，CQB - G type high temperature magnetic-driving centrifugal pump，CQB type magnetic-driving centrifugal pump，CQB type S.S explosion-proof centrifugal pump

The magnet and impeller of the brushless DC magnetic drive pump are injection molded into one to form the rotor of the motor. There is a directly injection molded shaft sleeve in the middle of the rotor, which is fixed in the housing through a high-performance ceramic shaft. The stator and circuit board of the motor are sealed in the pump body with epoxy resin adhesive. There is a thin wall isolation between the stator and rotor, which does not require traditional mechanical shaft seals and is completely sealed. The torque of the motor is generated by energizing the coils on the silicon steel sheet (stator) to generate a magnetic field that drives the permanent magnet (rotor) to operate. Magnetize the magnet in n (n is an even number) stages to form a fully coupled magnetic system between the parts of the magnet. When the magnetic pole generated by the stator coil is opposite to the magnetic pole of the magnet, that is, the displacement angle between the two magnetic poles is Φ=0, the magnetic energy of the magnetic system is at its lowest; When the magnetic poles rotate to opposite poles, i.e. the displacement angle between the two poles is Φ=2 π/n, the magnetic energy of the magnetic system is maximized. After removing the external force, due to the mutual repulsion of the magnetic poles in the magnetic system, the magnetic force will restore the magnet to its lowest magnetic energy state. So the magnet generates motion, driving the magnetic rotor to rotate. The brushless DC water pump uses electronic commutation without the need for carbon brushes. Both the magnet rotor and stator silicon steel plates have multi-stage magnetic fields. When the magnet rotor rotates at an angle relative to the stator, it automatically changes the direction of the magnetic poles, keeping the rotor always at the same level of repulsion, thus enabling the brushless DC magnetic isolation pump to have high speed and efficiency.

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2024-11-01

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