To improve dust collection performance sufficiently, to keep the improved performance for a long period, and to reduce production costs.
At least in an upstream side end part 5b of the part 5b and the downstream side end part 5c of a discharge part 5, projection parts 20 projecting in the gas flow direction are formed. The projection parts 20 are corrugated with root parts 20b formed in a round recess. The root parts are opened widely as compared with the sawtooth-shaped projection parts of an acute angle opened narrowly and made resistant to the affection of an electric field, a larger corona discharge current is secured to increase the charge of particles, the amount of dust deposited in the root aprts 20b is reduced, the processing of the projection parts 20 is facilitated, and the generation of processing distortion is controlled.
SHIBATA KENJI
HARASAKI TSUTOMU
MURATA EISAKU
KATO NOBUYUKI
EBARA CORP
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