Patent ID: 7111761

Claim:
A fluid discharge pump for discharging a fluid stored inside a fluid-storing portion, comprising: an outer cover being adapted to be connected to an upper portion of the fluid-storing portion and having a through-hole in its axis; a nozzle head being provided with a fluid discharge nozzle and being movable inside the cover in the axis; a first valve mechanism for inflow adapted to be connected to an opening of the upper portion of the fluid-storing portion; a second valve mechanism for outflow connected inside the nozzle head; a bellows member being connecting the first valve mechanism and the second valve mechanism and deforming from a stretched position to a folded-up position, thereby changing an amount of fluid in contact with and stored inside the bellows member, wherein when pressure inside the bellows member increases by downward movement of the nozzle head, the first valve mechanism closes and the second valve mechanism opens, and when pressure inside the bellows member decreases by upward movement of the nozzle head, the first valve mechanism opens and the second valve mechanism closes; and a third valve mechanism for anti-leakage disposed between the nozzle and the second valve mechanism inside the nozzle head, wherein when the second valve mechanism opens, the third valve mechanism opens, and when the second valve mechanism closes or is not in use, the third valve mechanism closes, wherein the third valve mechanism comprises: a tubular member connecting the nozzle and the second valve mechanism in the nozzle head and having a flexion flexed inward between the nozzle and the second valve mechanism; and a contact portion being disposed inside the tubular member and having an upper end fixed to the nozzle head and a lower end with an enlarged portion which has a diameter larger than an inner diameter of the flexion and is in contact with the flexion to close the flexion, wherein when the nozzle head descends, the contact portion moves relative to the tubular member to be detached from the flexion to open the flexion.