Dispensing system with in line chemical pump system

A chemical feed system for a foam dispenser, comprising:

• a motor;
• a pump unit;
• a drive transmission system in line between said motor and pump unit, said drive transmission system comprising a magnetic coupling assembly having a first magnetic coupling member and a second magnetic coupling member and an intermediate shroud positioned between said first and second magnetic coupling members and sealing fluid within said pump unit, and wherein said shroud has a chemical reception cavity into which chemical flows,
• wherein said drive transmission system includes a drive transmission shaft, and said pump unit includes an inlet pump manifold and an outlet pump manifold with said shroud fastened to said outlet pump manifold, and said outlet pump manifold includes a manifold reception cavity within which said drive transmission shaft axially extends, and said drive transmission shaft is supported by a first bearing device also received within the manifold reception cavity of said output pump manifold, and wherein said drive transmission system further comprises a second bearing device also received within said manifold reception cavity to provide bearing support to said drive transmission shaft and which second bearing device is axially spaced apart from said first bearing device, and
• wherein said second magnetic coupling member is received within said shroud and is spaced from said shroud as to have a fluid intermediate layer between a peripheral surface of said second magnetic coupling member and an interior surface of said shroud extending about said peripheral surface, and wherein said drive transmission shaft has an enlarged section positioned between two radially smaller sections, and said first and second bearing sections being received within said two radially smaller sections.

A chemical feed system for a foam dispenser, comprising:

• a motor;
• a pump unit;
• a drive transmission system in line between said motor and pump unit, said drive transmission system comprising a magnetic coupling assembly having a first magnetic coupling member and a second magnetic coupling member and an intermediate shroud positioned between said first and second magnetic coupling members and sealing fluid within said pump unit wherein said shroud has a chemical reception cavity;
• and
• an isocyanate feed inlet port that feeds isocyanate to the chemical reception cavity,
• wherein said shroud has a side wall and an upper cover which together define a sealed chemical reception cavity in which one of said first and second magnetic coupling members is received, and
• wherein a reactant foam precursor chemical flows between an interior surface of said shroud and the magnetic coupling member which is positioned in the chemical reception cavity formed within said shroud and is coupled to said pump unit, and the other magnetic coupling member is driven by said motor and drives said second magnetic coupling member,
• wherein said drive transmission system includes a drive transmission shaft, and said pump unit includes an inlet pump manifold, said inlet pump manifold including a base end in which is formed a fluid reception cavity, and said pump unit further comprising an annular base and a filter which is supported by said annular base in suspended fashion and has a fluid contact surface that extends across the fluid reception cavity as to be parallel with a cross-sectional plane extending perpendicular to an axis of elongation of said drive shaft.