| 摘要 |
A mechanical bladder pump (10) is provided for collecting fluid samples from a well (12). The pump (10) includes an outer tubular member (13) having a longitudinal bore, and an inner tubular member (14) arranged within the bore of the outer tubular member. The inner and outer tubular members (13, 14) ar e connected at their lower ends to a compressible bladder (11), and are arrang ed for oscillating movement relative to each other to expand and compress the bladder. The lower end of the bladder (11) is open to an inlet passage (28), and the upper end of the bladder is open to an outlet passage (29). First an d second check valves (30, 31) are provided to control the flow of fluid throu gh the bladder (11) during operation of the pump. A return spring (41) is used to store energy during a tension stroke of the inner tubular member (14) and to release energy during a compression stroke thereof. The pump provides highly representative samples of groundwater.
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