Cyclone separation device and electric vacuum cleaner

Abstract

A dust collection unit includes a swirl chamber, dust collection chambers, a discharge pipe, an inlet pipe, a bypass inlet, and a bypass inlet airflow passage. The swirl chamber swirls, along a side wall, dust-containing air having entered from a primary inlet and a secondary inlet having a smaller opening area than the primary inlet, and separates dust from the dust-containing air. The dust separated by the swirl chamber is collected by the dust collection chambers. A discharge pipe has a discharge opening. The inlet pipe allows the dust-containing air to flow from the primary inlet into the swirl chamber. A bypass inlet is formed in the inlet pipe. The bypass inlet airflow passage allows the dust-containing air in the inlet pipe having entered from the bypass inlet to flow from the secondary inlet into the swirl chamber.

Dependencies are inferred from the claim text.