The magnetic coupling is the most important element in the fluoroplastic magnetic pump. Today we will recognize the magnet above the magnetic coupling.
Magnets are divided into weak magnets and strong magnets.
Fluoroplastic magnetic pump is commonly used in two kinds, weak magnet also known as ferrite magnet, strong magnet called NdFeB magnet.
Ferrite magnet is a common black iron-absorbing stone, which is widely used in headphones, horns, permanent magnet motors and other fields, and of course, we fluoroplastic magnetic pump. The surface magnetic energy product (the value of magnetic height) of ferrite magnets can reach 12 000-16 000 Gs after saturated magnetization. The theoretical temperature resistance is 250 C. The magnetism will be demagnetized by curve at high temperature. When the temperature drops, the magnetism can be restored completely. Compared with other magnetic materials, the price has a great advantage, but because of the limitation of surface magnetic energy product, it can not be used in a wider range of industries. Therefore, the fluoroplastic magnetic pump or stainless steel magnetic pump made of ferrite magnet has a great advantage in price compared with the stainless steel magnetic pump with strong magnetism, but it is not competent for conveying high density medium. Because of the curve demagnetization characteristic of the magnet steel, the magnetic loss is more serious after the temperature is over 100, and the phenomenon of internal and external magnetic slippage is easy to occur. So the field of high temperature is also limited.
NdFeB magnets are nicknamed "magnets". Why do they say so? Because the surface magnetic energy product can reach 35,000-45,000 Gs after saturated magnetization. By improving the formula of NdFeB magnets, the magnetic energy product can be further improved. The Nd-Fe-B magnet of 38SH is introduced here. It is also the most used magnet in stainless steel magnetic pump. Its maximum usage temperature is 150 degrees centigrade. With the improvement of the formula, the maximum temperature can reach 200 c. When the operating temperature reaches the limit, the demagnetization curve of Nd-Fe-B shows a collapse type, and it will fade to 0 at a temperature point instantly. It can be said that Nd-Fe-B is very sensitive to temperature. The price of Nd-Fe-B is much higher than that of ferrite, but the magnetism it can provide is beyond the reach of ferrite. Therefore, Nd-Fe-B magnetic materials will have a broader application space and market in the future.
It can be seen that choosing different fluoroplastic magnetic pumps according to different working conditions is a problem you need to consider.