초록 ▼

A disposable concentrate pump where the small pump body is part of a liquid collapsible bag reservoir, and the actuating solenoid is mounted in the dispenser. When a new bag is loaded, the attached pump body is inserted into a solenoid. When the bag is empty the in-bag part of the pump will be dispo

A disposable concentrate pump where the small pump body is part of a liquid collapsible bag reservoir, and the actuating solenoid is mounted in the dispenser. When a new bag is loaded, the attached pump body is inserted into a solenoid. When the bag is empty the in-bag part of the pump will be disposed of, along with the empty bag.

대표청구항 ▼

What is claimed is: 1. A disposable pump for integration with a collapsible reservoir, comprising: a) a hollow pump body having a first end connecting to the reservoir and a second end for dispensing liquid; b) a seal-base inside the pump body dividing the pump body into a plunger chamber and a noz

What is claimed is: 1. A disposable pump for integration with a collapsible reservoir, comprising: a) a hollow pump body having a first end connecting to the reservoir and a second end for dispensing liquid; b) a seal-base inside the pump body dividing the pump body into a plunger chamber and a nozzle chamber, having a seal-base opening; c) a nozzle opening into air at the second end of the pump body, comprising an output hole small enough that liquid remains in the nozzle chamber and acts as a barrier to gas inflow; d) a plunger located in the plunger chamber in the pump body made of magnetic material, having a seal-head extending through the opening in the seal-base, reciprocally movable within the pump body from a first position nearer the first end of the pump body to a second position nearer the second end of the pump body; and e) a compression spring between the seal-base and the plunger, biasing the plunger into the first position; such that when the plunger is biased by the compression spring to the first position, the seal-head seals the seal-base opening by sealing against a side of the seal-base in the nozzle chamber, blocking flow of liquid. 2. The pump of claim 1 in which the pump body, nozzle and seal-head are made of molded plastic. 3. The pump of claim 1, in which the compression spring is made of non-magnetic metal. 4. The pump of claim 1, in which the plunger is made of a ferromagnetic metal. 5. The pump of claim 1, further comprising a solenoid coil surrounding the pump body, such that when the solenoid coil is actuated, the plunger is drawn magnetically to the second position. 6. The pump of claim 5, in which the pump further comprises a first pole piece inside the solenoid coil and surrounding the pump body adjacent the second end of the pump body. 7. The pump of claim 6, in which the pump further comprises a magnetic flux focusing ring inside the solenoid coil and surrounding the pump body adjacent the first end of the pump body, the focusing ring being separated from the pole piece by a gap. 8. The pump of claim 1, further comprising a collapsible reservoir having an output coupled to the first end of the pump body. 9. The pump of claim 8, in which the collapsible reservoir is a bag-in-box. 10. The pump of claim 1, in which the seal-head of the plunger is cone shaped. 11. The pump of claim 5, in which the solenoid coil is actuated by a pulse-width modulated current. 12. The pump of claim 11, in which the pulse-width modulated current is modulated such that: if a width of a current pulse provided to the solenoid is shorter than a time it takes to bring plunger velocity to zero, the plunger will be pushed back to the first position by the compression spring, and if a width of a current pulse provided to the solenoid is longer than the time it takes to bring plunger velocity to zero, the plunger will move toward the second position until the compression spring is completely compressed will be held during the duration of the pulse by the solenoid, such that the fully compressed spring and the plunger pressing on it will prevent liquid from flowing out of the nozzle. 13. The pump of claim 1, in which the plungers is of a size such that there is a gap between the plunger and inside wall of the pump body for fluid to flow around the plunger as the plunger moves from the second position to the first position. 14. The pump of claim 1, in which the pump further comprises a cup-shaped pole piece inside the pump body, having an open first end for contacting the plunger when the plunger is in the second position, and a second end forming the seal-base, and wherein the compression spring is located inside the pole piece. 15. The pump of claim 1, in which the plunger has a small diameter hole for passage of fluid through the plunger.