Fluid pump

A fluid pump, comprising:

• a press head portion having a discharge channel and a discharge vent;
• a first unidirectional valve disposed in the press head portion and adapted to allow a fluid to flow from a second end of the first unidirectional valve to a first end of the first unidirectional valve, wherein the first end of the first unidirectional valve is in communication with the discharge channel;
• an extensible sleeve pipe comprising an outer pipe, an inner pipe and a rebound element, wherein the inner pipe has a first end being in communication with the first unidirectional valve and a second end fitted to the first end of the outer pipe, wherein the inner pipe and the outer pipe form a capacity-variable storage chamber and connect to the rebound element;
• and
• a second unidirectional valve whereby a fluid flows from a second end thereof to a first end thereof, the first end being in communication with the second end of the outer pipe,
• wherein, upon contraction displacement of the inner pipe, the storage chamber has a greater pressure than the first unidirectional valve, thereby allowing the fluid to exit the storage chamber and enter the discharge passage via the first unidirectional valve,
• wherein, upon expansion displacement of the inner pipe, a pressure between the outside and the storage chamber is greater than a pressure of the second unidirectional valve, thereby allowing the fluid to flow into the storage chamber via the second unidirectional valve.