Foam dispensing systems with multiple liquid supplies, and related refill units

A refill unit for a foam dispensing system, the refill unit comprising:

• a first container holding a first liquid;
• a first outlet tube extending away from the first container;
• a second container holding a second liquid;
• a second outlet tube extending away from the second container;
• the first liquid and the second liquid chemically react when combined with one another;
• a space between the first liquid tube and the second liquid tube for receiving a plate therebetween;
• a mixing tube, wherein each of the first outlet tube and the second outlet tube are fluidically connected to the mixing tube, such that a mixing chamber is formed within the mixing tube at a point where the first liquid mixes with the second liquid;
• and
• a sealing member to seal the first outlet tube and second outlet tube when the refill unit is not installed in a dispenser;
• wherein the first outlet tube and the second outlet tube have a flexible portion which is disposed within a pinching region of the foam dispensing system, such that at least one pinching element of the dispensing system successively engages and disengages the flexible portion of the first outlet tube and the second outlet tube, to thereby cause the first liquid and the second liquid to enter the mixing chamber and form a mixture that expands to become a foam.

A foam dispensing system comprising:

• a first container holding a first liquid;
• a first outlet tube extending away from the first container;
• a second container holding a second liquid;
• a second outlet tube extending away from the second container;
• a mixing tube, wherein each of the first outlet tube and the second outlet tube are fluidically connected to the mixing tube, such that a mixing chamber is formed within the mixing tube at a point where the first liquid mixes with the second liquid;
• a first dispensing wheel mounted on a shaft defining an axis of rotation for the first dispensing wheel, the first dispensing wheel comprising at least one pinching element disposed on an interior side of the first dispensing wheel which is adjacent to at least one of the first outlet tube, the second outlet tube, and the mixing tube;
• a second dispensing wheel mounted on a shaft defining an axis of rotation for the second dispensing wheel, the second dispensing wheel comprising at least one pinching element disposed on an interior side of the second dispensing wheel which is adjacent to at least one of the first outlet tube, the second outlet tube, and the mixing tube
• an actuator for rotating the first and second dispensing wheels around the axis of rotation such that, as the first and second dispensing wheel rotate, the pinching elements successively engages and disengages at least one of the first outlet tube, the second outlet tube, and the mixing tube, to thereby cause the first liquid and the second liquid to enter the mixing chamber and form a mixture that expands to become a foam.