| 摘要 |
A pump for moving a fluid includes an outer chamber having a first end wall portion containing a fluid entrance port and a second end wall portion containing a fluid exit port, a valve tube slidably contained within the chamber and having a first edge with a cut out section, adjacent the chamber first end wall portion, a first cup member within the valve tube having an outwardly flared side wall with a lip resiliently bearing against the valve tube adjacent the first edge and having a bottom wall smaller than the chamber first end wall portion, spacer connecting and spacing apart the first cup member bottom wall and the chamber first end wall portion, a plunger having a tubular stem portion containing a check valve plug and extending through the chamber exit port, and having a second cup member contained within the valve tube and also having a bottom wall with a hole opening into the stem portion and an outwardly flared side wall bearing against the valve tube and oriented to oppose the first cup member, such that when the stem portion is moved outward through the exit port, the first and second cup members move apart and create a low pressure area between them, while the friction of the second cup member dragging against the valve tube moves the valve tube cut out section to a position beside the side wall lip of the first cup member, permitting liquid to pass through the entrance port and the cut out section and into the valve tube between the first and second cup members.
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