ELECTROMAGNETIC PUMP

PROBLEM TO BE SOLVED: To provide a technology effective for extending a life of a diaphragm and miniaturizing a pump, in an electromagnetic pump including the diaphragm connected to an electromagnetically-driven vibrator.SOLUTION: An electromagnetic pump includes a diaphram 142, a first center disc 150 and a second center disc 160, and a vibrator 130. The first center disc 150 includes an annular first disc contact surface 151a which is opposed to an outer surface 144 of the diaphragm 142, and which is also kept into contact with the outer surface 144 when the vibrator 130 is located on a neutral position. The second center disc 160 includes an annular second disc contact face 161a opposed to an inner surface 145 of the diaphragm 142, kept into contact with the inner surface 145 when the vibrator 130 is located on the neutral position, and having an outer diameter D2b determined within a range of 1.05-1.30 times of an outer diameter D1b of the first disc contact face 152a.SELECTED DRAWING: Figure 5 【課題】電磁駆動式の振動子に連結されたダイアフラムを備えた電磁式ポンプにおいて、ダイアフラムの寿命を延ばし且つポンプのコンパクト化を図るのに有効な技術を提供する。【解決手段】本発明に係る電磁式ポンプは、ダイアフラム１４２と第１センターディスク１５０及び第２センターディスク１６０と振動子１３０を備え、第１センターディスク１５０は、ダイアフラム１４２の外表面１４４に対向配置されるとともに、振動子１３０が中立位置にあるときに外表面１４４に当接する円環状の第１ディスク当接面１５１ａを備え、第２センターディスク１６０は、ダイアフラム１４２の内表面１４５に対向配置されるとともに、振動子１３０が中立位置にあるときに内表面１４５に当接し且つ第１ディスク当接面１５２ａの外径Ｄ１ｂの１．０５〜１．３０倍の範囲に設定された外径Ｄ２ｂを有する円環状の第２ディスク当接面１６１ａを備える。【選択図】図５