Electromagnetic pump for pumping liquid brazing filler metal

Abstract

The invention provides an electromagnetic valve for pumping liquid brazing filler metal. The electromagnetic valve is characterized in that the electromagnetic pump is provided with a soldering flux groove for accommodating the liquid brazing filler metal, an iron plate which extends from the upper portion to the bottom of the soldering flux groove is arranged on the soldering flux groove, a gap is reserved between the lower portion of the iron plate and the bottom of the soldering flux groove, the liquid brazing filler metal flows through the gap, and a liquid brazing filler metal flowing channel is formed between the iron plate and the wall of the soldering flux groove, and extends towards to the top of the soldering flux groove to form a liquid brazing filler metal nozzle; and a conveying belt is arranged at a position, which is adjacent to the flowing channel, of the outer portion of the soldering flux groove, a plurality of permanent magnets are placed on the conveying belt at intervals, and the conveying belt is driven by a motor to move upwards, so that an upward moving magnetic field is generated, and upwards thrust is correspondingly generated to push the liquid brazing filler metal to be jetted out from the nozzle. Problems of complexity, large occupied space, high heating and the like caused by an existing three-phase electromagnetic pump are avoided, and the electromagnetic valve is simple, small and light.

Description

technical field [0001] The invention relates to the technical field of soldering of electronic parts on a printed circuit board, in particular to an electromagnetic pump for pumping liquid metal solder. Background technique [0002] The electromagnetic pump is an important device for pumping liquid metal solder in the soldering of electronic parts on printed circuit boards. The commonly used induction electromagnetic pump generates induction electromagnetic force through the moving electromagnetic field, and the electromagnetic force acts on the liquid metal in a non-contact manner to generate thrust, so that the liquid metal flows through the nozzle to the parts to be welded. The moving magnetic field generator of this induction electromagnetic pump generally winds a three-phase excitation coil on an iron core, and generates a three-phase alternating current by means of the three-phase coil to generate a moving magnetic field. [0003] However, since this induction electro...

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Problems solved by technology

[0003] However, since this induction electromagnetic pump needs to use an iron core and corresponding coils to produce a moving magnetic field, the equipment is relatively large and complicated, which is heavy and takes up space.

At the same time, due to the heat conduction from the liquid metal to the coil and the heat generated by the coil through the current itself, it is necessary to equip the coil with a corresponding cooling device, which further makes the device system redundant.

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