A hand vacuum cleaner has an openable air treatment stage. The air treatment stage has a lower openable portion that is moveably mounted to a forward portion of the pre-motor filter housing.

A vortex finder, for a cyclonic separator, includes a plurality of stationary vanes having a round convex front end around which incoming air is guided into the vortex finder, wherein, where air separates from the plurality of stationary vanes inside of the vortex finder, a cross-section of the plurality of stationary vanes has only one sharp edge. Preferably, a mean line of the cross-section of the plurality of stationary vanes does not cross a chord line in an upstream half of the cross-section. Preferably, a side of the plurality of stationary vanes facing the incoming air is provided with a protrusion at a stagnation point. The protrusion may be shaped so as to guide the incoming air into the vortex finder, and may have a concave side following a shape of a neighboring vane, and a rounded top.

A docking station for a robotic surface cleaning apparatus is provide. The docking station has a plurality of cyclones comprising an upper cyclone and a lower cyclone. The cyclones are arranged such that the dirt outlet of the upper cyclone is not obstructed by the dirt outlet of the lower cyclone.

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. A momentum separator air inlet is provided in an inlet portion of the sidewall. The momentum separator air inlet faces an opposed portion of the sidewall that is opposed to the inlet portion of the sidewall and the inlet portion of the sidewall comprises a side screen.

A surface cleaning apparatus comprising an upstream air treatment stage and a downstream air treatment stage, which is positioned rearward of the upstream air treatment member. The upstream air treatment stage comprises an openable portion which is moveable between a closed position and an open position by a mount that is provided on the downstream air treatment stage.

Monolithic dust separation devices are disclosed to enable separating and collecting dust particles. The devices include a vacuum port and a cyclone chamber that are connected by a tube between the vacuum port and an upper end of the cyclone chamber. On the cyclone chamber there is an input port for connecting to a flexible hose for ingesting the dust particles. The devices also include a dust receptacle having a top upper surface and a port cover on a port formed in the upper surface for emptying the receptacle of collected dust particles and a lower portion of the dust receptacle that is integrally formed into the upper surface of the dust receptacle. The top upper surface slants downward from the cyclone chamber to the port cover.

A surface cleaning apparatus includes a cyclone having a plurality of tangential air inlets. Each tangential air inlet is formed of a sidewall and an end wall. The tangential air inlet has an inlet port which is positioned to face a wall of the cyclone chamber. The tangential air inlets have a flow straightener provided on a radial inner or outer side.

Dust separation devices are disclosed to enable separating and collecting dust particles. The devices include a vacuum port and a cyclone chamber that are connected by a tube between the vacuum port and an upper end of the cyclone chamber. On the cyclone chamber there is an input port for connecting to a hose for ingesting the dust particles. The devices also include a dust receptacle having a top upper surface and a port cover on a port formed in the upper surface for emptying the receptacle of collected dust particles and a lower portion of the dust receptacle that is integrally formed into the upper surface of the dust receptacle.

A surface cleaning apparatus includes a cyclone having a plurality of tangential air inlets. Each tangential air inlet is formed of a sidewall and an end wall. The tangential air inlet has an inlet port which is positioned to face a wall of the cyclone chamber. The tangential air inlets have a flow straightener provided on a radial inner or outer side.

A hand vacuum cleaner has an upstream air treatment stage having an upstream air treatment member and a longitudinal axis extending between the front and rear ends of the downstream air treatment stage, and a downstream air treatment stage a downstream air treatment member and a downstream dirt collection chamber that is exterior to the downstream air treatment member. The downstream air treatment member is positioned rearward of the upstream air treatment member. The downstream dirt collection chamber extends forward of the downstream air treatment member to a location that is forward of the rear end of the upstream air treatment stage.