Application Of Permanent Magnet In Refrigeration And Air Purification

China is a big country of rare earth,broadening the application field of the rare earths is very important for China's economic development.So the development of new permanent magnet applications may have practical significance while the permanent magnets use a lot of rare earth elements.In this paper,we have studied the application of permanent magnet in refrigeration and air purification.Usually in a rotary room temperature magnetic refrigerator,two Halbach magnet arrays are required in order to make a force balance for the whole system.Except for a large volume of magnet array,a coupling gear is needed for the two magnet arrays.It is found that a new magnet array may avoid the above disadvantages.The magnet arrays are divided into inner two-hole Halbach-like magnet array and outer Halbach magnet array.The outer magnet array may rotate around the inner magnet array.The inner Halback-like magnet array contains two rectangular holes parallel to cylindrical axis.The magnetic fields in the holes of inner magnet array are uniform and equal with opposite directions.The field in two holes alternately varies with the rotation of outer magnet array.It is shown that the field may be fairly uniform by calculation.The real two-in-one magnet array is made successfully and the measuring data of magnetic field support the calculation results.In terms of air purification,high-voltage electrostatic precipitator can ionize the gas,making small particles of dust move to the dust board after the charge under the action of electric field.In this article,we present a new idea,we add a magnetic field to the ionization zone of high voltage electrostatic precipitator.Charged particles from gas ionization will do cyclotron motion under the action of electromagnetic field,which will extend its trajectory and let it capture more dust.This method can improve its dust collection efficiency.In this paper,we have calculated,simulated,and experimented with this idea.Finally,the theoretical idea agrees well with the experimental results.