| 摘要 |
A foam dispenser includes a foam pump (10) communicating with the contents of a container (20) holding a foamable liquid. The foam pump includes a pump body (12) , a passage (14) extending through the pump body from an inlet (16) to an outlet (18), an inlet valve (22a) including an inlet flow regulator (26a), and an outlet valve (22b) including an outlet flow regulator (26a). The inlet receives foamable liquid from the container. The inlet valve (22a) and outlet valve (22b) are positioned in the passage (14) to define (a) an inlet stage (40), (b) an outlet stage (46), and (c) a transition stage (44). A liquid port (52) extends through the pump body (12) and communicates with the transition stage (44), and an air port (62) extends through the pump body (12) and communicates with the outlet stage (46). A liquid bellows (50) surrounds the liquid port (52) and an air bellows (60) surrounds the air port (62). The liquid bellows (50) contains the foamable liquid and is movable between an expanded volume and a contracted volume, and expels at least a portion of the foamable liquid to the passage (14) through the liquid port (52) when moved from its expanded volume to its contracted volume. The air bellows (60) contains air and is movable between an expanded volume and a contracted volume, and expels at least a portion of the air to the passage (14) through the air port (62) when moved from its expanded volume to its contracted volume. |
