Basic knowledge water pump ( Working principle of the magnetic pump by the pump, magnetic transmission device, motor)

by pump, magnetic pump magnetic transmission device, motor of three parts. Key components magnetic actuator by the outer magnetic rotor and inner magnetic rotor and not of permeability of sleeve. When the motor drives the outer magnetic rotor rotating magnetic field can penetrate air gap and the magnetic materials, magnetic drive is connected with the impeller in the rotor synchronous rotation, realize the power out of contact, the dynamic seal into static seal. Because of the water pump body, pump shaft, the magnetic rotor of sleeve completely closed, so as to thoroughly solve the 'run, run, drip, leak problem', in addition to the elimination refining &chemical industry flammable, explosive, toxic and harmful medium through the pump seal leakage security hidden danger, effectively guarantee the staff's physical and mental health and security production.

a and working principle of the magnetic pump will n on the magnet ( N is even) Regularly arrange assembly on the magnetic actuator on the internal and external magnetic rotor, make each other of part of the magnets complete coupling magnetic system. When inside and outside the two poles are relative, heteropolar displacement Angle between the two poles Φ = 0, the magnetic system of magnetic energy is relatively low; When the magnetic rotation to homopolar relative, that is, between the two poles of displacement Angle Φ = 2 PI/n, the magnetic system of the magnetic energy is larger. Get rid of external force, due to the magnetic poles repel each other, system low magnetic will restore the magnet to the magnetic energy state. Produce and magnet, magnetic rotor rotates.

second, the structural characteristics of

1, the permanent magnets

made of rare earth permanent magnet materials of the permanent magnet operating temperature range ( - 45－400℃) , high coercive force, magnetic field direction has the very good anisotropy, also won't happen in homopolar connect close demagnetization phenomenon, is a good source of magnetic field.

2, isolation sets

when using metal separation sleeve, isolation sets in a sinusoidal alternating magnetic field, in the direction perpendicular to the lines of magnetic force on the cross section of induced eddy current is converted into heat. Eddy current expression is: the Pe - eddy current; K— Constant; n— The rated speed of the pump; T - magnetic drive torque; F - the pressure inside the casing; D - casing diameter; The resistivity of a material; — The tensile strength of materials. After the pump design, n, T is the working condition of the given, to reduce the eddy current can only be taken into consideration from F, D, etc. Choose high resistivity, high strength of non-metallic materials of sleeve, in terms of reduce the eddy current effect is very obvious.

3, the control of cooling lubricant flow

magnetic pump operation, must use a small amount of liquid ring between internal magnetic rotor and isolation sets gap area and sliding bearing friction pair is to wash cold. But cold fluid flow are usually designed for pump flow of 2% 3%, clearance between magnetic rotor and isolation sets of area due to the eddy current and high quantity of heat generation. When cold is lubricant or flushing hole not free enough, jams, will lead to the medium temperature is higher than the work of the permanent magnet temperature, make the inner magnetic rotor gradually lose magnetism, the magnetic actuator failure. When the medium is water or aqueous solution, can make the maintained at 3 - the rise of temperature of the annular region 5℃； When the medium for hydrocarbon or oil, can make the temperature rise at 5 - ring gap area 8℃。

4, sliding bearing

magnetic pump sliding bearing materials impregnated graphite, filled ptfe, engineering ceramics, etc. Because the engineering ceramics has very good heat resistance, corrosion resistance, friction resistance, so the sliding bearing magnetic pump use engineering ceramics production more. Because engineering ceramics is very brittle and expansion coefficient is small, so the bearing clearance may not be too small, so as to avoid holding shaft accidents.

due to the magnetic pump sliding bearing lubrication to the transmission medium, so should be used according to different medium and conditions, choose different materials produced bearings.

5, protection

when the slave unit of magnetic transmission under the condition of overload operation or rotor card died, magnetic transmission device of the master and the slave unit will automatically slippage, protect the pump. Permanent magnet on magnetic actuator in active rotor under the action of alternating magnetic field, will produce eddy loss and magnetic loss, caused the rising of the temperature of the permanent magnet, magnetic actuator slippage failure.

3, the advantages of magnetic pump

with the use of mechanical seals or packing seal the centrifugal pump, magnetic pump has the following advantages.

1, the pump shaft by dynamic seal into a closed static sealed and completely avoid the media leak.

2, no independent lubrication and cooling water, reducing the energy consumption.

3, by coupling transmission into a synchronous drive, there is no contact and friction. Low consumption, high efficiency, and reducing vibration and damping, reduce the motor vibration on the influence of the magnetic pump and pump cavitation vibration effects on motor.

4, overload, inside and outside magnetic rotor relative detachment, have protective effect on motor and pump.

In an age when submersible pump is increasingly important, the researchers believe manufacturers should pay close attention to their results.
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