Dispensing device
The present invention relates to a dispensing device comprising: —a container ( 2 ) for holding a liquid having an opening, and—a dispensing assembly ( 4 ) mountable on or in said opening, said dispensing assembly comprising: —a pump ( 5 ) having a pump chamber ( 7 ) and a pump inlet ( 6 ) comprising an inlet valve ( 9 ) and a pump outlet ( 8 ) comprising an outlet valve ( 10 ), and—a liquid supply channel ( 16 ), one end of said channel ( 16 ) being in fluid communication with said inlet ( 6 ), the other end being arranged in a bottom portion of said container ( 2 ), wherein a one-way valve ( 20 ) is arranged in said channel ( 16 ), and wherein an air inlet opening ( 17 ) is provided between said inlet valve ( 9 ) and said one-way valve.
1. A dispensing device for dispensing a foam, comprising:
a container for holding a liquid and having an opening, and
a dispensing assembly mountable on or in said opening, said dispensing assembly comprising:
a pump having a pump chamber and a pump inlet comprising an inlet valve and a pump outlet comprising an outlet valve, and
a liquid supply channel, one end of said channel being in fluid communication with said pump inlet, the other end being arranged in a bottom portion of said container,
wherein the dispensing device comprises a separate foam-forming device mounted on or in the pump inlet of the pump, defining at least a part of the liquid supply channel, said foam-forming device further comprising a one-way valve and defining at least partially an air inlet opening to the liquid supply channel, said air inlet opening being provided between said pump inlet and said one-way valve.
2. Dispensing device as claimed in claim 1 , wherein said dispensing assembly comprises a dip tube defining at least a part of said channel.
3. Dispensing device as claimed in claim 1 , wherein said foam-forming device is arranged between said pump inlet and said dip tube.
4. Dispensing device as claimed in claim 1 , wherein said pump inlet comprises a tube shaped end comprising an inlet opening, the foam-forming device having a tube shaped top end to be arranged on or in said tube shaped end of said pump inlet.
5. Dispensing device as claimed in claim 4 , wherein said tube shaped end of said pump inlet and/or said tube shaped top end of said foam-forming device comprises one or more grooves which define said air inlet opening.
6. Dispensing device as claimed in claim 3 , wherein said foam-forming device comprises a tube shaped bottom end, wherein said one end of said dip tube is or is to be arranged on or in said tube shaped bottom end of said foam-forming device.
7. Dispensing device as claimed in claim 1 , wherein said air opening is in fluid communication with a top portion of the interior of said container.
8. Dispensing device as claimed in claim 1 , wherein a sponge or sponge-like material is arranged in said pump chamber.
9. Dispensing device as claimed in claim 1 , wherein said one-way valve is arranged at or above half the height of said channel, preferably at or above 75% of the height of said channel.
10. Dispensing device as claimed in claim 1 , wherein two or more air inlet openings are provided between said inlet valve and said one-way valve.
11. Dispensing device as claimed in claim 1 , wherein two or more air inlet openings are provided in said channel.
12. Method for providing a foam dispensing device, comprising the steps of:
providing a liquid dispensing device having:
a container for holding a foamable liquid having an opening, and
a dispensing assembly mounted or to be mounted on or in said opening, comprising a single liquid pump having a pump chamber and an inlet comprising an inlet valve and an outlet comprising an outlet valve, and
mounting a separate foam-forming device on or in said inlet of said pump, said foam-forming device defining at least a part of a liquid supply channel to the inlet, said foam forming device comprising a one-way valve and defining at least partially an air inlet opening to the liquid supply channel, said air inlet opening being provided between said inlet valve and said one-way valve.
13. The method of claim 12 , wherein the method further comprises
arranging a dip tube in said dispensing device, one end of said dip tube being in fluid communication with said foam-forming device, the other end being arranged in a bottom portion of said container.
14. Foam-forming device mountable on or in an inlet of a liquid pump, defining, when mounted on the liquid pump, at least a part of a liquid supply channel to a pump inlet of the liquid pump, said foam-forming device further comprising a one-way valve and defining at least partially an air inlet opening to the liquid supply channel, said air inlet opening being provided between said inlet and said one-way valve.