Magnetic drive pump (hereinafter referred to as magnetic pump, the same below) and belong to the same non-shielded pump structure of the same pump, the structure is only static seal without moving seal, used to transport liquid can guarantee a drop of leak. First, the working principle of the magnetic pump Magnetic drive on the centrifugal pump and all magnetic drive principle, is the use of magnets to attract ferromagnetic material and magnetic or magnetic field between the magnetic properties of the role; and non-ferromagnetic material does not affect or Rarely affect the size of the magnetic force, it can be non-contact through the non-magnetic conductor (isolation sleeve) for power transmission, this device is called a magnetic coupling. Motor through the coupling and the outer magnet together, the impeller and the inner magnet together. Between the outer magnet and the inner magnet with a fully sealed isolation sleeve, the inner and outer magnet completely separated so that the inner magnet in the medium, the motor shaft through the magnet pole between the suction force directly impeller synchronization Turn. Second, the structure of the magnetic pump Magnetic pump by the pump, the impeller, the magnet, the outer magnet, isolation sets, the pump shaft, pump shaft, sliding bearings, rolling bearings, couplings, motors, bases and other components Of the magnetic pump, the outer magnet and the motor shaft directly linked together, eliminating the pump shaft, rolling bearings and couplings and other components). 1, pump body, impeller and seal pump similar. 2, Magnetic coupling Magnetic coupling consists of inner magnet (including guide ring and sleeve), outer magnet (including guide ring) and isolation sleeve, which is the core part of magnetic pump. Magnetic coupling structure, magnetic circuit design, and its various parts of the material related to the reliability of magnetic pumps, magnetic drive efficiency and life expectancy. (1) Magnet inside the magnet and guide ring with adhesive coupling. To separate the magnet from the medium, the inner magnet must be covered with a sheath. There are two kinds of metal and plastic package, welding metal package, plastic package with injection molding. (2) the outer magnetic steel and guide ring with adhesive coupling. (3) isolation sleeve isolation sleeve, also known as sealing sleeve, located between the inner and outer magnets, the inner and outer magnets completely separated, the medium enclosed in the isolation sleeve. Isolation sleeve thickness and working pressure and the use of temperature, too thick to increase the gap size of the inner and outer magnets, thus affecting the magnetic drive efficiency; too thin will affect the strength. Isolation sleeve with two kinds of metal and non-metallic, metal sleeve with a loss of eddy current, non-metallic sleeve without eddy loss. 3, sliding bearing magnetic pump pump shaft supported by the sliding bearings. Since the plain bearing is lubricated by poorly lubricated conveying medium, the plain bearing should be made of a material having good abrasion resistance and self-lubricating property. Commonly used bearing materials are silicon carbide ceramics, graphite, filled with PTFE and so on. 4, Coupling Couplings and sealed pumps, the use of flexible coupling. 5, the motor has a sealed motor pump, the use of standard motor, such as the domestic Y series three-phase asynchronous motor, YB series explosion-proof motor.
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