Surface cleaning apparatus

A surface cleaning apparatus comprising an air treatment chamber, the air treatment chamber comprising an air inlet, an air outlet, first and second opposed ends, a treatment chamber axis extending between the first and second opposed ends and an air treatment chamber sidewall extending between the first and second ends,

• wherein the air inlet has a downstream end that is located in the air treatment chamber, the downstream end comprises an inlet air flow path comprising an inlet sidewall, an inlet end wall and an outlet port, the inlet end wall forming an axial inward end of the outlet port, the inlet sidewall and the inlet end wall having inner surfaces along which air flows as the air travels to and through the outlet port, and an inlet axis extends in a common direction with the treatment chamber axis centrally through an empty volume defined by the inner surface of the inlet sidewall,
• wherein the inner surface of the inlet sidewall is curved at a location at which the inlet sidewall meets the inlet end wall and the inlet end wall also has an inner surface that is curved, wherein the outlet port faces towards a portion of the air treatment chamber sidewall whereby the downstream end of the air inlet redirects air traveling through an upstream portion of the air inlet from a generally axial flow to flow through the outlet port,
• wherein the inlet end wall has an outer side that is axially opposed to the inner surface of the end wall, the outer side is spaced axially inwardly into the air treatment chamber from the inner surface of the end wall such that the inlet axis intersects the inner surface and the outer side of the inlet end wall whereby a volume is provided between the air treatment chamber sidewall, the inner surface of the end wall, and the outer side, and the volume is closed from fluid communication with the air treatment chamber, and
• wherein air exits the air outlet of the air treatment chamber in a flow direction, the flow direction extending in a common direction with the axis.

A surface cleaning apparatus comprising an air treatment chamber, the air treatment chamber comprising an air inlet, an air outlet, first and second opposed ends, an air treatment chamber sidewall extending between the first and second ends and a treatment chamber axis that intersects the first and second opposed ends, the air inlet has a downstream end that is located in the air treatment chamber, the downstream end comprises an inlet air flow path comprising an inlet sidewall, an inlet end wall, which is located at an axially inner end of the inlet sidewall, and an outlet port that faces towards a portion of the air treatment chamber sidewall, the inlet end wall forming an axial inward end of the outlet port, the inlet sidewall and the inlet end wall having inner surfaces along which air flows as the air travels to and through the outlet port, the downstream end having an inlet axis extending centrally through an empty volume defined by the inner surface of the inlet sidewall in a common direction with the treatment chamber axis, the inner surfaces comprising a curved portion that is located at the outlet port of the air flow path,

• wherein the inlet axis intersects the inlet end wall, the inlet end wall has an outer side that is axially opposed to the inner surface of the end wall, the outer side is spaced axially inwardly into the air treatment chamber from the inner surface of the end wall in the common direction whereby a volume is provided between the air treatment chamber sidewall, the inner surface of the end wall and the outer side, and the volume is closed and separate from the air treatment chamber, and
• wherein air exits the air outlet of the air treatment chamber in a flow direction, the flow direction extending in the common direction.