the female screw 221a formed in the fan body 221 of the axial flow fan 220 a protrusion 272 is formed on the outer circumferential surface of the lower portion of the terminal connection axle 270 so that the terminal connection axis 270 is not detached from the through hole 212 of the pulsator 210 when the axial flow fan 220 rotates the central connection shaft 280 can be made of an elastic steel a stainless steel or a plastic material and the stainless steel is preferable in order to prevent the possibility of corrosion a filtering member 290 is disposed at the upper end of the through hole 212 of the pulsator 210 in order to remove any foreign particles included in the water currents and simultaneously to protect the axial flow fan 220 from any foreign particles and the laundry the operation and effect according to the first embodiment of the present invention will be hereinafter described in detail during a washing process the laundry detergent and washing water are inserted into the spin drying tub 60 the washing shaft 51 and the pulsator 210 are rotated oscillated in the forward and reverse direction and then the pulsator vanes 211 arranged radially on.