Cyclone separation device

A cyclone separation device comprising:

• a first intake port circumferentially disposed in a side surface on a side of a one end of a case, and configured to allow air to be fed into the case to cause a swirling airflow in the case;
• a second intake port disposed in a side surface on a side of the other end of the case, and located at a lowermost part in a direction of gravity in a state where a central axis of the case is kept in a horizontal position;
• an outflow port having a cylindrical shape, the outflow port being disposed in a one end face on the side of the one end of the case and configured to discharge the air fed into the case through the first intake port from the case;
• a space partition plate partitioning an interior of the case into a first swirl chamber communicating with the first intake port and a second swirl chamber located closer to an outer-circumference side than the first swirl chamber is, the second swirl chamber communicating with the second intake port;
• a through-hole disposed in the space partition plate so as to penetrate through the first swirl chamber and the second swirl chamber;
• and
• a cylindrical member disposed in the first swirl chamber on the side of the other end of the case,
• wherein
• the outlet port and the cylindrical member are arranged such that a central axis of the outlet port and a central axis of the cylindrical member agree with the central axis, and
• an end face of the cylindrical member on the side of the outflow port is located within a range overlapping the through-hole in the direction of the central axis of the through hole when the cylindrical member is seen from side view.