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The classification and working principle of electromagnetic pump
Electromagnetic pump (electromagnetic pump) The use of modern magnetism principle, the use of permanent magnets to achieve non-contact indirect transmission of a chemical process pump. The interaction between the magnetic field and the current in the conductive fluid causes the fluid to exert a pressure gradient by the electromagnetic force and interacts with the movable pump body to drive the pump body to vibrate and push the liquid output. Large electromagnetic pump and structure (Figure 1) The electromagnetic pump is divided into: DC electromagnetic pump and AC electromagnetic pump two categories. DC electromagnetic pumps include conductive electromagnetic pumps (planar and helical) and pyro-electromagnetic pumps; AC electromagnetic pumps include single-phase AC electromagnetic pumps (planar and annular induction) and three-phase AC electromagnetic pumps Spiral induction, circular induction). The principle of DC conduction In general, DC conduction structure is relatively simple, it consists of poles, electrodes, pump ditch and other components. In the directional magnetic field between the NS pole, through the pump ditch on both sides of the electrode to the liquid metal through the DC, DC direction perpendicular to the direction of the magnetic field, according to the left hand rule generates electromagnetic force-driven metal solution flow, change the pole or electrode pole Sex can change the direction of flow. Adjust the magnetic field strength or DC current size can change the drive strength. DC brushless electromagnetic pump (Figure 2) AC conductive electromagnetic pump Working principle AC conductive electromagnetic pump consists of electrodes, iron core, the main and auxiliary coils and pump ditch. When the main coil through the AC power frequency, the air core in the air gap to produce an alternating magnetic field, the alternating magnetic field in the pump ditch on the metal at the same time produce an alternating magnetic field core induction coil on the secondary coil from , While in the secondary coil induced electromotive force, the electrode and the liquid metal circuit composed of AC, at any moment in the direction of the pump ditch magnetic field and the direction of the current through the liquid metal according to the left hand rule to determine the electromagnetic force The direction is certain, the electromagnetic force drives the liquid metal to flow directionally in the pump ditch. AC electromagnetic pump (Figure 3) Electromagnetic metering pump Electromagnetic metering pump is the use of electromagnetic push rod driven diaphragm reciprocating motion within the pump head, causing the pump chamber volume and pressure changes, pressure changes caused by the suction valve and the drain valve Open and close, to achieve the quantitative liquid inhalation and discharge. Electromagnetic metering pump is a kind of metering pump which is driven by electromagnet and designed for transporting low pressure and low pressure liquid. It has the advantages of simple structure, small energy consumption, accurate measurement and convenient adjustment. Electromagnetic metering pump (Figure 4)