The invention relates to the technical field of portable dust collectors, in particular to a portable
dust collector with an inner air duct and an outer air duct. The handy
dust collector with the inner air duct and the outer air duct is of a cylinder structure and comprises a dust collection cup and a cylinder body which are detachably connected. A dust suction port is formed in the end, away from the cylinder body, of the dust collection cup, a filtering
assembly is detachably arranged in the dust collection cup, a motor and a battery
assembly are detachably arranged in the cylinder body inthe
airflow flowing direction in sequence, and an air outlet is formed in the end, away from the dust collection cup, of the cylinder body. The battery
assembly comprises a battery support with a triangular cross section and a
battery pack, and the outer air duct is formed between the battery support and the inner wall of the cylinder body. The
battery pack comprises three batteries which are arranged at three vertex angles of the triangular structure of the battery support respectively, and the inner air duct is formed in the internal space of the
battery pack. Due to the arrangement of the inner air outlet channel and the outer air outlet channel, the air outlet area is enlarged, the air outlet amount and the air outlet efficiency are increased, the
suction force and the dust collectionefficiency of the portable
dust collector are improved, the heat dissipation of the motor and the batteries is facilitated, and the service life of the device is prolonged.