| As a kind of magnetic separation equipment,magnetic separators are widely used in various industries of the national economy,such as the purification of various metal minerals and non-metallic minerals,the treatment of industrial waste water and so on.With the strengthening of environmental awareness and the scarcity of natural resources,magnetic separators are playing an increasingly important role.The development of higher performance magnetic separators has become a hot topic for many experts and scholars.Magnetic system as the core device of the magnetic separator,the heat dissipation problem can not be ignored..In recent years,although permanent magnetic separators have made great progress,electromagnetic magnetic separators still occupy a dominant position in industrial production with high electromagnetic and large throughput.Therefore,it is still of great significance to study its heat dissipation methods and improve its heat dissipation structure.In this paper,a water-cooled electromagnetic magnetic separator is selected as the research object.Aiming at many shortcomings of the existing cooling methods,such as large energy consumption,easy to plug,wasting water resources,etc.the oil-cooled remolding is carried out to design a forced oil circulating cooling excitation coil with higher reliability and better cooling effect to increase the overall performance of the magnetic separator.The main research work of this article is:(1)Based on the theory of electromagnetic fields,the three-dimensional static magnetic field analysis method is used,the magnetic circuit model is created in ANSYS based on the core parameters of the magnetic separator.The average magnetic flux in the core air gap is obtained by changing the amplitude of the input current.The variation curve of the average magnetic flux with the excitation current results in the conclusion that the air gap flux density reaches saturation when the excitation current exceeds 1000 A.Based on this conclusion and the actual space of the magnetic separator,a forced oil-cooled excitation coil is designed.(2)Based on the theory of fluid heat transfer,using the ANSYS FLOTRAN fluid thermal analysis module,a three-dimensional oil flow coil model is established.The processing method for the three-dimensional mesh of the complex model is studied.The processing method for three-dimensional mesh division of complex model is studied.The temperature field and velocity field distribution of the whole coil are obtained when the inlet velocity is 0.4m/s and no guide structure.The effect of the number and position of the baffle on the temperature rise of the coil is compared under different guiding structures.It was concluded that when the number of baffles is four and the baffle was not provided on the top of the coil,the effect is best to control the temperature rise of the coil.For the problem of non-uniform temperature distribution of the coil,finer modeling and "one in and two out" methods are used to improve the model.Simulation results show that the hot spot temperature of the improved model is reduced.The temperature distribution of the coil is uniform and the heat dissipation effect is obvious.Finally,the influence of different inlet flow rates on the overall temperature rise of the coil is discussed.(3)A small excitation coil is designed and manufactured to set up an experimental device for simulating the heating and cooling of the coil.The temperature of the coil is obtained when different currents are passed under the condition of coil heating and heat dissipation in balance.Then,it is modeled in ANSYS with the same scale,and the temperature field distribution is obtained by simulation.Through comparison,it is found that the error of the two values is within 5?,which verifies the correctness of the simulation results. |
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