PROBLEM TO BE SOLVED: To modify the configuration of electrodes in the fluid channel in an EHD (ElectroHydroDynamic) pump to reduce the channel resistance of the EHD pump and simplify the alignment of the electrodes to reduce a production cost.
SOLUTION: An electrical insulation pipe is inserted into the small diameter side of a metal taper pipe electrode so that the electrical insulation pipe is in contact with the inner circumferential surface of the taper pipe electrode. A metal rod electrode 2 is inserted into the electrical insulation pipe along the central axis of the electrical insulation pipe. The portion of the metal rod electrode extended from inside the metal taper pipe electrode into the electrical insulation pipe is exposed. The other end of the metal rod electrode is covered with insulating coating and is encircled with the metal taper pipe electrode to form a fluid delivery channel. The exposed portion of the metal rod electrode is opposed to the inside surface of the metal taper pipe electrode. The gap between the metal taper pipe electrode and the metal rod electrode is filled with a fluid in which dissociated ions are produced when an electric field is exerted between both the metal electrodes. Direct-current high voltage is applied to between the metal taper pipe electrode and the metal rod electrode.
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