Foam soap generator

摘要

A foam soap generator is provided for implementation with various types of foam soap delivery systems. The foam soap generator includes converging air and liquid soap passages at a mixing chamber, where a prefoam is generated for ultimate extrusion through a porous passage member. In one embodiment of the invention, the liquid soap is drawn into an entrainment zone by high velocity air passing through the air passageway and into the mixing chamber.

主权项

1. A foam generator for a soap dispenser, comprising:
a housing having an air inlet and a liquid inlet located at a first end of the housing; an air flow line connected to the air inlet, wherein the air flow line separates the housing from a remote air pump; a liquid flow line connected to the liquid inlet, wherein the liquid flow line separates the housing from a remote liquid pump; an entrapment zone located within the housing; a mixing chamber located within the housing downstream of the entrapment zone, wherein the mixing chamber has a larger volume than the entrapment zone and the diameter of the mixing chamber is greater than the diameter of the air inlet and the diameter of the liquid inlet; an air passage extending between said air inlet and said mixing chamber, the air passage extending along an axial path, and wherein at least a portion of the entrapment zone is contained in the air passage; a liquid passage extending between said liquid inlet and said entrapment zone, the liquid passage extending substantially parallel to the air passage for a first distance and extending a second distance that is not parallel to the air passage and the liquid passages converges into the air passage at the entrapment zone and the air and liquid are combined at the entrapment zone and expelled into said mixing chamber and said air passage constricts in cross section in the flow direction prior to the entrapment zone to increase the velocity of the air prior to said convergence with said liquid passage at said entrapment zone; and a porous passage member located downstream of the mixing chamber, wherein the porous passage member causes the mixture of liquid and air to be expelled as a foam.