A modular liquid pump operable as a liquid pump when used by itself and as a foam pump when combined with a modular air pump is disclosed herein. In one embodiment, the modular liquid pump includes a housing for forming a least a portion of a liquid pump chamber; an inlet valve for allowing liquid into the liquid pump chamber; an outlet valve for allowing liquid out of the liquid pump chamber; and an attachment mechanism configured to secure the liquid pump housing to a modular air pump. The modular liquid pump operates alone to output a liquid or operates in combination with an air pump to output a foam. One embodiment includes a modular air pump configured to be secured to the modular liquid pump. In such a combination, the modular liquid pump and the air pump operate together to output a foam.
1. A modular liquid pump operable as a liquid pump when used by itself and as a foam pump when combined with a modular air pump, the modular liquid pump comprising:
a liquid pump housing for forming at least a portion of a liquid pump chamber;
an inlet valve for allowing liquid into the liquid pump chamber;
a liquid piston movable within the liquid pump housing;
an outlet valve for allowing liquid out of the liquid pump chamber; and
an attachment mechanism configured to secure the liquid pump housing to a modular air pump;
wherein the modular liquid pump operates alone to output a liquid through a first outlet and selectively operates in combination with the modular air pump to output a foam through a second outlet; and
wherein when the liquid pump housing is secured to the modular air pump, the modular air pump and the liquid piston are coaxial and the liquid piston extends at least partially through the center of the modular air pump.
2. The modular liquid pump of claim 1 further comprising:
a modular air pump configured to be secured to the modular liquid pump,
wherein the combination of the modular liquid pump and the air pump operate together to output a foam.
3. The modular liquid pump of claim 2 wherein the attachment mechanism comprises at least one of a snap-fit connection, a welded connection, an adhesive, a friction fit, a taper lock, a threaded connection or a bayonet connection.
4. The modular liquid pump of claim 2 further comprising a modular foam generator secured to the modular air pump, wherein the second outlet is downstream of the foam generator.
5. The modular liquid pump of claim 1 further comprising a liquid output adjustment mechanism to adjust the output volume of the modular liquid pump.
6. The modular liquid pump of claim 2 further comprising an air output adjustment mechanism to adjust the output volume of the modular air pump.
7. The modular liquid pump of claim 1 wherein the liquid pump is a liquid piston pump.
8. The modular liquid pump of claim 2 wherein the air pump is an air piston pump.
9. A modular air pump for connecting to a modular liquid pump to form a foam pump comprising:
a housing forming at least a portion of an air chamber;
the housing having a securing mechanism for securing the housing to a modular liquid pump to form the foam pump when combined with the modular liquid pump that has a liquid outlet;
wherein when combined with the modular liquid pump, a liquid piston of the modular liquid pump extends through at least a portion of the modular air pump chamber and the modular air pump chamber and the piston are coaxial with respect to one another, and liquid flows out of the liquid outlet and mixes with air flowing out of the modular air pump below the liquid outlet.
10. The modular air pump of claim 9 wherein the securing mechanism comprises at least one of a snap-fit connection, a welded connection, an adhesive, a friction fit, a taper lock, a threaded connection or a bayonet connection.
11. The modular air pump of claim 9 wherein at least a portion of the air chamber is formed by the liquid pump after the modular air pump is secured to the liquid pump.
12. The modular air pump of claim 11 further comprising an air piston moveable at least partially within the housing.
13. The modular air pump of claim 11 further comprising an air inlet opening and an air inlet valve.
14. The modular air pump of claim 11 wherein the securing mechanism is at least part of a snap-fit mechanism.
15. The modular air pump of claim 11 wherein the securing mechanism is a mechanical connection.
16. The modular air pump of claim 11 further comprising an air volume adjustment mechanism to vary the volume output of the modular air pump.
17. A method for assembling a foam pump comprising:
obtaining a modular air pump configured to attach to the modular liquid pump; obtaining a modular liquid pump that has a piston and a liquid outlet that selectively operates as a liquid pump and that has an attachment mechanism for attaching the liquid pump to the modular air pump;
and
connecting the modular air pump to the modular liquid pump to create a foam pump;
wherein when connected together, the liquid piston extends at least partially through the air chamber and wherein the modular air pump and the piston are coaxial oriented; and
wherein liquid flows out of the liquid outlet prior to mixing with air flowing out of the modular air pump.
18. The method of claim 17 further comprising obtaining a modular foam generator and attaching the modular foam generator to the foam pump.
19. The method of claim 17 further comprising adjusting the volume output of the modular liquid pump.
20. The method of claim 17 further comprising adjusting the volume output of the modular air pump.
21. The method of claim 17 wherein obtaining a modular liquid pump comprises obtaining a modular liquid piston pump.
22. The method of claim 17 wherein obtaining a modular air pump comprises obtaining a modular air piston pump.