An air treatment apparatus has a momentum separator positioned in an air flow path. The momentum separator has an upper wall, a lower wall, a sidewall extending between the upper and lower walls and a momentum separator air inlet. The upper wall comprises an upper screen and an upper end wall is spaced from and faces the upper screen wherein an upper air flow chamber is positioned between the upper end wall and the upper screen.

A hand vacuum cleaner has a cyclone assembly positioned in the air flow path, the cyclone assembly comprising a cyclone chamber, the cyclone chamber having a front end, a rear end, a cyclone axis of rotation extending between the front and rear ends, a cyclone air inlet and a cyclone air outlet provided at the rear end of the cyclone chamber, wherein the rear end is rotationally moveable by a rotational mount between a closed position in which the cyclone is closed and an open position wherein a rear portion of the cyclone is open.

A dirt separator for a vacuum cleaner includes a chamber having an inlet through which dirt-laden fluid enters and an outlet through which cleansed fluid exits the chamber. A disc located at the outlet rotates about a rotational axis and comprises holes through which the cleansed fluid passes. The dirt-laden fluid enters the chamber along a flow axis that intersects the disc.

A multi-cyclone dust collecting device according to the present disclosure comprises: a primary cyclone formed to primarily separate contaminants from introduced contaminant-containing air; and a plurality of second cyclones which are installed in the primary cyclone so as to separate fine dust from air discharged from the primary cyclone, and each of which has a plurality of introduction ports and one discharge port, wherein the plurality of introduction ports arranged on each of the plurality of secondary cyclones protrude outward from a body of each of the plurality of secondary cyclones and are formed in tangential directions to the outer circumferential surface of the each of the plurality of secondary cyclones.

A docking station for a robotic surface cleaning apparatus has a momentum separator. The momentum separator has a plurality of walls comprising an upper wall, a lower wall and a first sidewall, wherein the first sidewall extends between the upper and lower walls, and wherein the first sidewall comprises a side screen. A first end wall is spaced from and faces the side screen wherein an up flow chamber is positioned between the first end wall and the side screen.

A surface cleaning apparatus uses an inverted cyclone. An air flow path extends from a dirty air inlet to a clean air outlet. A suction motor is positioned in the air flow path. The inverted cyclone is downstream from the dirty air inlet in a first cyclonic cleaning stage. The cyclone defines a cyclone chamber having a lower air inlet, a lower air outlet and an upper dirt outlet. An openable dirt collection chamber is in communication with the upper dirt outlet.

A dirt separator for a vacuum cleaner includes a chamber having an inlet through which dirt-laden fluid enters and an outlet through which cleansed fluid exits the chamber. A disc located at the outlet rotates about a rotational axis and comprises holes through which the cleansed fluid passes. The dirt-laden fluid enters the chamber along a flow axis that intersects the disc.

A surface cleaning apparatus comprises an air treatment member having an air treatment chamber. A moveable member is positioned in the air treatment chamber. A driving assembly is drivingly connected to the moveable member wherein the driving assembly is operable between a stored position is which the surface cleaning apparatus is operable to clean a surface and a cleaned position in which the moveable member has been translated through at least a portion of the chamber, wherein, in the stored position, a portion of the driving assembly is longitudinally spaced from the first and second axially spaced apart ends of the air treatment chamber.

A cleaner includes a suction unit guiding air and dust, a main body including a first cyclone unit separating the air and the dust, which are suctioned through the suction unit, from each other and a second cyclone unit separating the dust from the air discharged from the first cyclone unit, and a guide unit disposed in the main body to partition a first dust storage part, in which the dust separated in the first cyclone unit is stored, and a second dust storage part, in which the dust separated in the second cyclone unit is stored, from each other. The guide unit is separably coupled to the main body, and when the guide unit is separated from the main body, a dust discharge part of the second cyclone unit is exposed to the outside.

A surface cleaning apparatus includes first and second pre-motor filters that are in parallel.