Magnetic driven pump is a new type of centrifugal chemical process pump based on centrifugal pump, using magnetic coupling to achieve torque contact-free transmission, no shaft seal, full seal, no leakage, corrosion resistance, no pollution. Magnetic pump is a non-leakage fluid conveying machine without dynamic seal. It is mainly designed for centrifugal pump in vane pump. It is usually composed of pump body, isolation sleeve and connecting parts which can withstand pressure shielding sealing chamber. There is a rotating permanent magnet field outside the sealing cavity, and through the role of magnetic field, drive the magnetic rotor components inside the sealing cavity to rotate synchronously, and the rotor components inside the sealing cavity drive the impeller to achieve work on the fluid. Because there is no dynamic seal in the shielding sealing chamber composed of stator components, and the rotating shaft that drives the impeller to do work does not penetrate the shielding sealing chamber, so as to ensure zero leakage and no pollution of the magnetic pump. 01 The structure principle of magnetic pump 1. Magnetic drive pump (referred to as magnetic pump) is usually composed of motor, strong coupler and centrifugal pump, its main feature is the use of magnetic coupler transfer power, when the motor drives magnetic coupler external magnetic rotor rotation, magnetic force lines through the gap and isolation sleeve, acting on the internal magnetic rotor, the pump rotor and motor synchronous rotation, no mechanical contact to transfer torque, At the power input end of the pump shaft, there is no leakage at all because the liquid is enclosed in a static isolation sleeve and there is no dynamic seal. 2 magnetic drive pump using advanced technology design, hydraulic compliance with the original centrifugal pump high efficiency and reliability. It cancels the traditional mechanical seal device, changes the steel connection between the motor and the pump into a contact-free flexible connection, and fundamentally eliminates the shaft seal leakage. 02 Magnetic pump application range and transport medium Magnetic drive centrifugal chemical process pump, it is widely used in chemical industry, petrochemical industry, metallurgy, pharmaceutical, printing and dyeing, paper making, electroplating and other enterprises production process transport corrosive or does not allow pollution, relative density of 1.84 below, viscosity similar to water, does not contain iron filings impurities and solid particles of liquid, Especially suitable for flammable, explosive, volatile liquid and toxic and valuable media transportation. 03 Magnetic pump transmission characteristics and transmission mode 1. Transmission characteristics The magnetic pump magnetic drive adopts the pull-push intensive cylindrical structure, under the same magnetic volume, the torque it can transmit is about 1.5 times that of the distributed magnetic structure, this structure will maximize the utilization of magnetic energy, while the weight of the inner and outer rotor is also greatly reduced, reducing the weight of the rotor system and the influence of imbalance on the sliding bearing. 2. Transmission form Magnetic drives come in two forms. (1) disc-shaped magnetic coupling A disc-shaped magnetic coupling consists of two circular magnets facing each other and an isolating sleeve between them. There will be a large axial force between the two magnets, so the measures to balance the axial force and thickening the isolation sleeve must be adopted, otherwise the isolation sleeve will be deformed and damaged. (2) cylindrical magnetic coupling Cylindrical magnetic couplings have no axial force. A cylindrical magnetic coupling consists of an inner and outer rotor. The matrix of the inner and outer rotors is made of ordinary steel that can be magnetized. Multiple permanent magnets are arranged in the parallel axis direction of the outer circular surface of the inner rotor and the inner circular surface of the outer rotor, forming a "combined pull-push magnetic circuit". Theory and practice have proved that this cylindrical "combined pull-push magnetic circuit" can obtain larger transmission torque per unit magnetic volume under the same magnetic circuit parameters, about 4 times of the traditional distributed magnetic circuit. The magnetic pump uses this cylindrical "combined pull-push magnetic circuit"
