Venturi tube assembly and manual/pneumatic pump including the venturi tube assembly

A manual/pneumatic pump comprising:

• a Venturi tube assembly comprising:
• a Venturi tube having a body section, an inlet end being positioned on one side of the body section, while an outlet end being positioned on the other side of the body section, an internal flow passage being formed in the body section between the inlet end and the outlet end, a pneumatic sucking passage outward extending from a low static pressure section of the internal flow passage to an outer circumference of the body section;
• and
• a blocking member having an exhaustion space for communicating the outlet end with the atmosphere and a blocking body movable between an unblocking position and a blocking position, when positioned in the unblocking position, the outlet end communicating with the atmosphere via the exhaustion space, when positioned in the blocking position, the outlet end being blocked out of communication with the atmosphere, said Venturi tube assembly being characterized in that the blocking member further includes a micro-section movable between a full open position and a micro-position, when positioned in the full open position, the exhaustion space fully communicating the outlet end with the atmosphere, whereby a full amount of airflow is exhausted from the outlet end to the atmosphere, when positioned in the micro-position, a micro-amount of airflow smaller than the full amount being exhausted from the outlet end to the atmosphere;
• a collection barrel having a hollow barrel body with a top open end and a top cover disposed at the top open end of the barrel body to block the top open end, an interior space of the barrel body communicating with the pneumatic sucking passage of the Venturi tube assembly;
• and
• a manual pumping member having a pumping tube, two ends of the pumping tube being closed, a piston set being slidably disposed in the pumping tube, a manual sucking passage communicating with the interior space of the barrel body and the interior space of the pumping tube, whereby gas in the interior of the barrel body can be sucked into the pumping tube via the manual sucking passage and exhausted to the atmosphere by means of operating the piston set, the manual pumping member further including a blocking section movable between an unblocking position and a blocking position, when positioned in the unblocking position, the manual sucking passage being freed to communicate with the interior space of the pumping tube and the interior space of the barrel body, when positioned in the blocking position, the manual sucking passage being blocked to discommunicate the interior space of the pumping tube from the interior space of the barrel body.