Dual-stage cyclonic air separator

A dual-stage cyclonic separator for separating debris from air in a bagless surface cleaning apparatus, comprising:

• a cyclonic frustum comprising:
• a frustum wall having an outer frustum wall for directing a preliminary centrifugal airflow thereabout and an inner frustum wall for directing a ultimate centrifugal airflow therein, with the frustum wall tapering generally inwardly from a frustum extent disposed adjacent a frustum extent opening toward an opposed frustum extent disposed adjacent a frustum egress;
• a cylindrical wall depending upwardly from an interface with the frustum extent opening and terminating in a cylindrical ingress;
• and
• an airflow turret provided at the cylindrical ingress that facilitates transition of the preliminary centrifugal airflow to the ultimate centrifugal airflow;
• a debris collection cup comprising:
• a cup wall having an outer cup wall that, together with a debris collection device and the outer frustum wall, provides a coarse debris collection area within which debris is deposited by the preliminary centrifugal airflow, and an inner cup wall that provides a fine debris collection area within which debris is deposited by the ultimate centrifugal airflow, with at least a portion of the opposed frustum extent depending inwardly into the debris collection cup such that the ultimate centrifugal airflow deposits debris directly within the fine debris collection area;
• a cyclonic sieve having a sieve wall coextensive with a turret extent for placement adjacent the airflow turret and an opposed debris restriction extent, with the sieve wall having a continuous portion for directing the preliminary centrifugal airflow about the frustum wall and a louvered portion for delivering airflow to the airflow turret, and with the louvered portion including a plurality of apertures;
• and
• an airflow outlet configured to deliver air from the debris collection device after depositing debris in the fine debris collection area.