| 摘要 |
A liquid/gas pump includes a stainless steel strip of uniform width that is encased within a flexible and liquid/gas impermeable plastic tube whose inner diameter is only somewhat less than the width of the metal strip. The tube is thus deformed to a generally elliptical shape, and the longitudinal edges of the metal strip are sealed by physical contact with the inner diameter of the plastic tube. Two elongated passageways are thus formed, one passageway being above the metal strip, and the other passageway being below the metal strip. A linear series of bistable position and somewhat overlapping shallow domes are formed into the metal strip. As one end of the plastic tube and metal strip assembly is reciprocated relative to the other end, the metal domes pop from one side of the metal strip to the other side. As a result, the volume of a first passageway increases as the volume of the other passageway decreases. As a result, liquid/gas is drawn into one end of the first passageway as liquid/gas is dispensed from one end of the other passageway. Each passageway includes a first check valve allowing liquid flow from the respective passageway. Each passageway includes a second check valve that allows liquid flow out of the passageway.
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