Interaction of magnetic field and current in conductive fluid
The magnetic pump has no mechanical moving parts, has a simple structure, good sealing performance, reliable operation, and does not require a shaft seal. Therefore, it is used in the chemical and printing industries to transport some toxic heavy metals, such as mercury and lead, and is used in nuclear power plants. Liquid metals (sodium or potassium, sodium-potassium alloys) as heat transfer media are also used to convey molten non-ferrous metals in foundry production.
The electromagnetic pump is similar to an ordinary solenoid valve. It uses alternating current as the working power. The current forms an alternating fixed magnetic field through the electromagnetic windings, interacts with the movable pump body, drives the pump body to vibrate, and promotes liquid output.
An electromagnetic pump is a device that uses the interaction of a magnetic field and an electric current in a conductive fluid to cause a fluid to generate a pressure gradient due to electromagnetic forces, thereby promoting fluid movement. In practice, it is mostly used for pumping liquid metal, so it is also called liquid metal electromagnetic pump. Electromagnetic pumps can be divided into AC pumps and DC pumps according to the form of power supply; they can be divided into conductive electromagnetic pumps and inductive electromagnetic pumps according to the current feeding method in liquid metal; they can be divided into planar pumps and cylindrical pumps according to different structures. In a conductive pump, the current is directly transmitted to the liquid metal by an external power source through the electrodes on both sides of the pump trench; in an induction pump, the current is induced by an alternating magnetic field. The electromagnetic pump has no rotating parts, simple structure, good sealing and reliable operation. Therefore, it is used to transport some toxic heavy metals such as mercury and lead in the chemical industry and printing industry; it is particularly active in the chemical industry of atomic power Metals, such as sodium, potassium, sodium-potassium alloys; can be used as a quantitative pump for active metals such as aluminum and magnesium in foundry companies, but now it is mainly used by large enterprises such as military industries. The disadvantage of electromagnetic pump is its low efficiency. The disadvantage of electromagnetic pump is its low efficiency, which has not been widely used in the smelting and foundry industries.