A surface cleaning apparatus has a cyclone chamber having a longitudinal cyclone axis of rotation wherein the dirt outlet is defined by a gap between the sidewall of the cyclone and a plate positioned at the dirt outlet end of the cyclone.

A hand vacuum cleaner has a first air treatment stage comprising a first stage air treatment chamber and a first stage longitudinal axis extending between the front and rear ends of the first air treatment stage and a second air treatment stage downstream from the first stage air treatment chamber, the second air treatment stage a second stage air treatment chamber and a second stage dirt collection chamber that is exterior to the second stage air treatment chamber. The second stage dirt collection chamber extends forward of the second stage air treatment chamber. A plane that is transverse to the first stage longitudinal axis extends through the first stage air treatment chamber and the second stage dirt collection chamber, and the first stage air treatment chamber and the second stage dirt collection chamber are concurrently openable.

A hand vacuum cleaner has a first air treatment stage comprising a first stage air treatment chamber and a first stage longitudinal axis extending between the front and rear ends of the first air treatment stage and a second air treatment stage downstream from the first stage air treatment chamber, the second air treatment stage a second stage air treatment chamber and a second stage dirt collection chamber that is exterior to the second stage air treatment chamber. The second stage dirt collection chamber extends forward of the second stage air treatment chamber. A plane that is transverse to the first stage longitudinal axis extends through the first stage air treatment chamber and the second stage dirt collection chamber, and the first stage air treatment chamber and the second stage dirt collection chamber are concurrently openable.

A surface cleaning apparatus or a docking station for a surface cleaning apparatus comprises a housing body has air flow path extending from an air inlet of the housing body to an air outlet of the housing body and, a non-cyclonic momentum separator positioned in the housing body wherein a portion of the momentum separator is spaced from the housing body wherein a chamber is provided exterior to the momentum separator and within the housing body. An air flow conduit extends from the air inlet of the housing body to an air inlet of the momentum separator, and the air flow conduit extends through the chamber. A portion of the momentum separator that is spaced from the housing body comprises at least two sides of the momentum separator, and the at least two sides of the momentum separator are porous and comprise an air outlet of the momentum separator.

A surface cleaning apparatus or a docking station for a surface cleaning apparatus comprises a housing body has air flow path extending from an air inlet of the housing body to an air outlet of the housing body and, a non-cyclonic momentum separator positioned in the housing body wherein a portion of the momentum separator is spaced from the housing body wherein a chamber is provided exterior to the momentum separator and within the housing body. An air flow conduit extends from the air inlet of the housing body to an air inlet of the momentum separator, and the air flow conduit extends through the chamber. A portion of the momentum separator that is spaced from the housing body comprises at least two sides of the momentum separator, and the at least two sides of the momentum separator are porous and comprise an air outlet of the momentum separator.

A bioreactor system for culturing cells, comprising: —at least one bioreactor (3); and —at least one hydrocyclone (5a; 5b; 5c; 5d, 5d′; 5e) comprising: —a cell culture inlet (7) which is connected to a cell culture outlet (9) of the bioreactor (3) via a pump (11), whereby a cell culture from the bioreactor can be transferred to the hydrocyclone (5a: 5b; 5c; 5d, 5d′; 5e) when a cell culture is provided in the bioreactor, —a hydrocyclone separation part (13) into which cell culture can be introduced from the cell culture inlet (7), —a top outlet (15) through which a part of the cell culture with decreased cell concentration can be transferred after separation in the hydrocyclone separation pan (13); and —a bottom outlet (17) through which a pan of the cell culture with increased cell concentration can be transferred after separation in the hydrocyclone separation part (13), wherein said bottom outlet (17) of the hydrocyclone (5a; 5b; 5c; 5d, 5d′; 5e) is provided in a position such that when the bioreactor system is used for culturing cells the bottom outlet (17) is in connection with a headspace (21) of the bioreactor (3) and wherein said bottom outlet (17) is provided such that the bottom outlet (17) has a free space around it such that a cell culture transferred out form the bottom outlet (17) is allowed to freely discharge around the bottom outlet.

A bioreactor system for culturing cells, comprising: —at least one bioreactor (3); and —at least one hydrocyclone (5a; 5b; 5c; 5d, 5d′; 5e) comprising: —a cell culture inlet (7) which is connected to a cell culture outlet (9) of the bioreactor (3) via a pump (11), whereby a cell culture from the bioreactor can be transferred to the hydrocyclone (5a: 5b; 5c; 5d, 5d′; 5e) when a cell culture is provided in the bioreactor, —a hydrocyclone separation part (13) into which cell culture can be introduced from the cell culture inlet (7), —a top outlet (15) through which a part of the cell culture with decreased cell concentration can be transferred after separation in the hydrocyclone separation pan (13); and —a bottom outlet (17) through which a pan of the cell culture with increased cell concentration can be transferred after separation in the hydrocyclone separation part (13), wherein said bottom outlet (17) of the hydrocyclone (5a; 5b; 5c; 5d, 5d′; 5e) is provided in a position such that when the bioreactor system is used for culturing cells the bottom outlet (17) is in connection with a headspace (21) of the bioreactor (3) and wherein said bottom outlet (17) is provided such that the bottom outlet (17) has a free space around it such that a cell culture transferred out form the bottom outlet (17) is allowed to freely discharge around the bottom outlet.

A vacuum cleaner includes a suctioning unit, a main body including a cyclone unit for separating dust from the air suctioned through the suctioning unit, a body forming a dust container for storing the dust separated by the cyclone unit, and a body cover for opening and closing the lower side of the body. A filter unit is arranged in the body for filtering air. An actuating unit is configured to move in the body along a space between the outside of the filter unit and the inner circumferential surface of the body.

A vacuum cleaner includes a suctioning unit, a main body including a cyclone unit for separating dust from the air suctioned through the suctioning unit, a body forming a dust container for storing the dust separated by the cyclone unit, and a body cover for opening and closing the lower side of the body. A filter unit is arranged in the body for filtering air. An actuating unit is configured to move in the body along a space between the outside of the filter unit and the inner circumferential surface of the body.

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.