Cyclone, a small cyclone is a small cyclone with a high efficiency cyclone dust collector bypass channel outside the cyclone cylinder, dust and gas from the inlet to cut into the small dust, gas gain rotary motion, while the air flow is divided into upper and lower separated to form a double vortex movement, a strong separation of dust in the exhaust at the bottom that is double vortex boundary. Lighter finer dust particles from the upper cyclone vortex airflow taken to the upper part of the small, gray ring is formed under the top cover strong rotation, resulting in accumulation of dust, and is drawn from the separation of the upper chamber of the Ad Hoc bypass hole, After bypassing the separation chamber lower helical grooves, from small cyclones tangentially introduced into the outer wall of the return air filter cartridge lower part of the internal air flow convergence, the dust is separated and fall into the hopper. Another part of the weight of thick dust particles swirling airflow is lower, driven by the dust separator and into the hopper through a similar process on the vortex airflow along the lower segment of small cyclone.