Cyclone separation device and electric vacuum cleaner

摘要

A dust collection unit (13) is provided with a swirl chamber (29), dust collection chambers (30, 31), a discharge pipe (57), an inlet pipe (35), a bypass inlet opening (41), and a bypass inlet air flow passage (28). The swirl chamber (29) swirls dust-containing air along the side wall and separates dust from the dust-containing air, the dust containing air having entered from a primary inlet opening (40) and from a secondary inlet opening (42) which has a smaller opening area than the primary inlet opening (40). The dust separated by the swirl chamber (29) is captured by the dust collection chambers (30, 31). A discharge opening (54) is formed in the discharge pipe (57). The inlet pipe (35) allows the dust-containing air to flow from the primary inlet opening (40) to the swirl chamber (29). The bypass inlet opening (41) is formed in the inlet pipe (35). The bypass inlet air flow passage (28) allows the dust-containing air within the inlet pipe (35), the dust-containing air having flowed from the bypass inlet opening (41), to flow from the secondary inlet opening (42) to the swirl chamber (29).