Patent ID: 8196780
Filing Date: 2012-06-12
Classification: A47K,B01F,B05B,F04C

Abstract:
1. A dispenser for dispensing foam comprising: a positive displacement rotary vane mixing pump having: a rotor chamber-forming member having an interior chamber defined by interior chamber walls, and a rotor journalled for rotation about a rotor axis inside the interior chamber; the rotor having a plurality of vanes extending outwardly radially relative the rotor axis for engagement with the chamber walls; the vanes extending from the rotor circumferentially spaced from each other about the rotor axis; a plurality of vane chambers, each vane chamber formed between two respective adjacent vanes and the chamber walls; wherein, in each rotation of the rotor about the rotor axis in the interior chamber, each pair of adjacent vanes passes through a suction sector of the interior chamber and a discharge sector of the interior chamber and wherein in movement of each two adjacent vanes through the suction sector the respective vane chamber increases in volume, and in movement of each two adjacent vanes through the discharge sector the respective vane chamber decreases in volume; an air inlet into the suction sector of the interior chamber, a fluid inlet into the interior chamber upstream of the discharge sector, an outlet from the discharge sector of the interior chamber, a reservoir for a fluid capable of foaming in communication with the fluid inlet of the mixing pump, the outlet in communication with a discharge opening, a foam generator between the outlet of the interior chamber and the discharge outlet in which on air and the fluid passing through the foam generator produces foam, a fluid pump between the reservoir and the fluid inlet to inject fluid through the fluid inlet, the fluid pump includes a positive displacement rotary vane fluid pump having: a rotor chamber-forming member having an interior chamber defined by interior chamber walls, and a rotor journalled for rotation about a rotor axis inside the interior chamber; the rotor having a plurality of vanes extending outwardly radially relative the rotor axis for engagement with the chamber walls; the vanes extending from the rotor circumferentially spaced from each other about the rotor axis; a plurality of vane chambers, each vane chamber formed between two respective adjacent vanes and the chamber walls; wherein, in each rotation of the rotor about the rotor axis in the interior chamber, each pair of adjacent vanes passes through a suction sector of the interior chamber and a discharge sector of the interior chamber and wherein in movement of each two adjacent vanes through the suction sector the respective vane chamber increases in volume, and in movement of each two adjacent vanes through the discharge sector the respective vane chamber decreases in volume; a fluid inlet into the suction sector of the interior chamber of the fluid pump in communication with the reservoir, a fluid outlet from the discharge sector of the interior chamber of the fluid pump in communication with the fluid inlet of the mixing pump, the rotor axis of the mixing pump and the rotor axis of the fluid pump are coaxial, the rotor of the mixing pump and the rotor of the fluid pump are coupled for rotation together, the interior chamber of the mixing pump is adjacent the interior chamber of the fluid pump with an intermediate partition member therebetween defining on a first axially directed side a portion of the interior chamber walls of the interior chamber of the mixing pump and on a second axially directed side a portion of the interior chamber walls of the interior chamber of the fluid pump, an opening extending axially through the partition comprising both the fluid outlet from the discharge sector of the interior chamber of the fluid pump and the fluid inlet into the suction sector of the interior chamber of the mixing pump.