一种改进的泵送无铅钎料的液态金属电磁泵

Improved liquid metal electromagnetic pump for pumping leadless brazing filler metal

Abstract

The utility model provides a liquid metal electromagnetic pump for pumping the leadfree solder in a braze welding apparatus of a printed circuit board, which is composed of a solder slot, a pump channel, and an electromagnet, wherein the upper part of the solder slot presents a square shape, and the height of a rectangular section of the pump channel is gradually increased along the opening direction. A flow splitting plug is arranged in the middle of the outlet part of a left nozzle, and the outlet part of a right nozzle inclines towards the right side. A vibration preventing column is welded in the active region center of the magnetic field of the pump channel, and an energizing coil is embedded on an iron core column below an open iron core. The defects of weak oxidation resistance, poor wettability of the leadfree solde, etc. are compensated. The reliability and qualified rate of the braze welding products are improved. Under the condition of ensuring the large electromagnetic force and suppressing electromagnetic noise, the utility model has the advantages of simple structure and easy fabrication and simultaneously improves heat dissipation conditions of the energizing coil.
本实用新型提供了一种在印刷电路板钎接设备中,用来泵送无铅钎料的液态金属电磁泵。它主要由钎料槽、泵沟以及电磁铁组成,钎料槽上部呈口字形,泵沟矩形截面高度沿开口方向是逐渐增大的,分流塞装在左喷嘴出口部中心,右喷嘴出口部向右倾斜,防振柱焊接在泵沟磁场作用区中心,励磁线圈镶套在开口铁芯下边铁芯柱上。它们补偿了无铅钎料抗氧化能力弱和润湿性差等缺陷,提高了钎焊产品的可靠性和合格率,在确保较大的电磁压力和抑制电磁噪音的情况下,其结构简单,便于制造,同时改善了励磁线圈的散热条件。

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