A beverage dispenser provides numerous inventive features in its refrigeration system, diluent delivery system, concentrate delivery system, mixing and dispensing system, and control system. The refrigeration system employs a plate heat exchanger to provide on demand refrigeration of an intermittent water flow. The diluent delivery system includes a flowmeter/solenoid/check-valve assembly. The concentrate delivery system employs a positive displacement pump. The mixing and dispensing system includes a mixing nozzle that has a locking feature such that an elevated blocking surface directly faces the inlet of pressurized diluent to create turbulence. The control system receives package-specific information from a scanner and diluent flow rate information from the flowmeter, and then determines the pump speed in order to set a desired mix ratio.
1. A method for mixing and dispensing a plurality of liquids, the method comprising the steps of:
(a) providing a nozzle body generally extending longitudinally along a rotational axis and defining a liquid passageway through the nozzle body;
(b) providing a housing and inserting the nozzle body into the housing and forming a mixing chamber therebetween;
(c) providing a blocking surface situated asymmetric about the rotational axis of the nozzle body;
(d) directing a first liquid stream into the mixing chamber toward the blocking surface;
(e) directing a second liquid stream into the mixing chamber in a generally downward direction toward the passageway in the nozzle body; and
(f) redirecting the first liquid stream off the blocking surface in an upward direction and into the path of the second liquid stream so as to meet the second liquid stream at an obtuse angle.
2. The method of claim 1 , further comprising the step of:
(g) locking the blocking structure in a predetermined orientation substantially facing the first fluid stream coming into the mixing chamber during use.
3. The method of claim 2 wherein step (g) is performed through a locking structure that is asymmetric about the rotational axis of the nozzle body.
4. The method of claim 3 wherein the locking structure comprises a D-shaped collar around the nozzle body.
5. A method for mixing and dispensing a plurality of liquids, the method comprising the steps of:
(a) providing a nozzle body comprising an inlet section and an outlet section, the nozzle body defining a liquid passageway from the inlet section to the outlet section;
(b) providing a housing and inserting the nozzle body into the housing and forming a mixing chamber therebetween;
(c) providing a substantially concave or convex blocking surface near the inlet section of the nozzle body;
(d) directing a first liquid stream into the mixing chamber toward the blocking surface;
(e) directing a second liquid stream into the mixing chamber in a generally downward direction toward the passageway in the nozzle body; and
(f) redirecting the first liquid stream off the blocking surface in an upward direction and into the path of the second liquid stream so as to meet the second liquid stream at an obtuse angle.
6. The method of claim 5 wherein the first liquid stream comprises a pressurized stream of diluent and the second liquid stream comprises a concentrate of greater viscosity.
7. The method according to claim 1 , wherein the obtuse angle is greater than 120 degrees.
8. The method according to claim 7 , wherein the obtuse angle is approximately 180 degrees.
9. The method according to claim 5 , wherein the obtuse angle is greater than 120 degrees.
10. The method according to claim 9 , wherein the obtuse angle is approximately 180 degrees.