Patent ID: 7695537

Claim:
A dust collector with a function of secondary collection comprising: a bottom base; an air guiding box installed above said bottom base, having an empty interior and provided with a suction hole and a dust collecting hole bored corresponding at its top and its bottom surface respectively; a blower composed of a motor and plural blades, said motor fixed on a top of one of said suction holes and provided with a shaft extended into said air guiding box with said blades set around said shaft; a guiding device installed inside said air guiding box with its upper side positioned around said upper dust collecting hole and provided with a hood shaped as a funnel tapered gradually downward and a positioning portion located on said hood; a filtering bag having its opening fixedly sealed with a top of said positioning portion of said guiding device; a dust bag having its opening fixedly sealed with said lower dust collecting hole of said air guiding box; said positioning portion is formed as an annular frame and provided with an annular groove formed around its intermediate portion; two annular projections respectively formed around an upper and a lower edge of said groove; said upper dust collecting hole provided with an annular projection formed around its upper side for corresponding to said lower annular projection of said positioning portion; and said filtration bag provided with an annular projection formed at its opening in corresponding to said upper annular projection of said positioning portion.