초록 ▼

The pump has a pumping chamber with a deflectable diaphragm member and fluid inlet and outlet passages. A deflectable valve flap is disposed across the fluid inlet passage and another flexible valve flap is disposed across the fluid outlet passage. Movement of the flexible valve flaps is responsive

The pump has a pumping chamber with a deflectable diaphragm member and fluid inlet and outlet passages. A deflectable valve flap is disposed across the fluid inlet passage and another flexible valve flap is disposed across the fluid outlet passage. Movement of the flexible valve flaps is responsive to movement of the flexible diaphragm member, reciprocation of which establishes alternate sequential suction and discharge conditions. An air chamber provided in the pump receives outside air through an air vent opening and also communicates with the pump discharge passage through a bleed hole when the outlet passage is closed by the outlet valve flap. The outlet valve flap is also deflectable to a position where it closes the bleed hole. Under this arrangement, continuous siphoning of fluid through the pump after the pump has been shut down is obviated. In the event that an obstruction occurs at the discharge section of the pump the outlet valve flap will move to a position intermediate the outlet passage and the bleed hole thereby permitting discharged fluid to bypass the discharge section of the pump and return to an inlet supply portion of the pump.

대표청구항 ▼

1. A pump for use with a fluid reservoir container, said pump comprising, a pumping chamber, fluid intake means for directing fluid into said pumping chamber, fluid discharge means for directing fluid out of said pumping chamber, flexible diaphragm means at said pumping chamber deflectable in a firs

1. A pump for use with a fluid reservoir container, said pump comprising, a pumping chamber, fluid intake means for directing fluid into said pumping chamber, fluid discharge means for directing fluid out of said pumping chamber, flexible diaphragm means at said pumping chamber deflectable in a first direction to draw fluid through said fluid intake means into said pumping chamber and deflectable in a second direction to expel fluid from said pumping chamber through said fluid discharge means, reciprocating means communicable with said diaphragm means for moving said diaphragm means in said first and second directions, an inlet valve disposed across said fluid intake means and an outlet valve disposed across said fluid discharge means, an air chamber in said pump in communication with the fluid in said container and having vent means for venting said air chamber at the atmosphere, a bleed hole for permitting communication between said fluid discharge means and said air chamber, said inlet and outlet valves being deflectable such that movement of said flexible diaphragm means in said first direction causes movement of said inlet valve to a fully open position to permit drawing of fluid into said pumping chamber and movement of said outlet valve to a fully closed position to prevent reverse flow from said fluid discharge means to said pumping chamber, and movement of said flexible diaphragm means in said second direction causes movement of said inlet valve to a fully closed position to prevent reverse flow of said fluid from said pumping chamber back to said fluid intake means and, during normal operation of the pump with the fluid discharge means in an unblocked condition, causes movement of said outlet valve to a fully open position to permit discharge of fluid from said pumping chamber to said fluid discharge means, said outlet valve in said fully open position closing said bleed hole and interrupting communication between said fluid discharge means and said air chamber. 2. The pump as claimed in claim 1, wherein upon blockage of fluid flow downstream of said fluid discharge means, said outlet valve is moveable to a position intermediate the fully open and fully closed positions of said outlet valve to permit communication between said fluid discharge means and said air chamber while said fluid discharge means communicates with said pumping chamber whereby fluid pumped from said pumping chamber into said fluid discharge means is permitted to flow through said bleed hole into said air chamber. 3. The pump as claimed in claim 1, wherein said reciprocating means include a crankshaft connected to said diaphragm means. 4. The pump as claimed in claim 3, wherein said reciprocating means further include drive means and means for eccentrically joining said drive means to said crankshaft. 5. The pump as claimed in claim 1, wherein an elastomeric sheet is placed across said fluid intake means and said fluid discharge means and said inlet and outlet valves are formed as deflectable flaps in said elastomeric sheet. 6. The pump as claimed in claim 5, wherein said fluid inlet means includes a fluid inlet port, said inlet valve being disposed upon said fluid inlet port when said inlet valve is in said fully closed position and said fluid outlet valve being disposed against said outlet port when said outlet valve is in said fully closed position. 7. The pump as claimed in claim 6, wherein said inlet valve deflects in a first direction when it opens and said outlet valve deflects in a second direction opposite said first direction when said outlet valve opens. 8. A pump for use with a fluid reservoir container, said pump comprising, a pumping chamber, fluid intake means for directing fluid from said container into said pumping chamber, fluid discharge means for directing fluid out of said pumping chamber, flexible diaphragm means at said pumping chamber deflectable in a first direction and in a second direction opposite said first direction such that deflection of said diaphragm means in said first direction draws fluid through said fluid intake means into said pumping chamber and deflection of said diaphragm means in said second direction expels fluid from said pumping chamber through said fluid discharge means, reciprocating means communicable with said diaphragm means for moving said diaphragm means in said first and second directions, and valve means comprising a substantially planar flexible sheet disposed across said fluid intake means and said fluid discharge means, said valve means including a deflectable flexible inlet valve comprising a first movable flap integral with said sheet and disposed across said fluid intake means, said flap having an open position for permitting flow of fluid from said fluid intake means to said pumping chamber and a closed position for preventing reverse flow of fluid from said pumping chamber to said fluid intake means, said valve means further including an outlet valve comprising a second movable flap integral with said sheet and disposed across said fluid discharge means, said flap having an open position for permitting flow of fluid from said pumping chamber to said fluid discharge means and a closed position for preventing reverse flow of fluid from said fluid discharge means to said pumping chamber, said inlet valve and said outlet valve being arranged such that movement of said diaphragm means in said first direction causes said inlet valve flap to deflect toward said open position and said outlet valve flap to move toward said closed position, and movement of said diaphragm means in said second direction causes said inlet valve flap to deflect toward said closed position and said outlet valve flap to move toward said open position, said pump further including an air chamber therein in communication with the fluid in said container and having vent means for venting said air chamber to atmosphere, and including a bleed hole for permitting communication between said fluid discharge means and said air chamber when said outlet valve flap is in said closed position, said outlet valve flap having a fully open position wherein it covers said bleed hole and blocks communication between said fluid discharge means and said air chamber. 9. The pump as claimed in claim 8, wherein said fluid intake means and said fluid discharge means comprise respective passageways defined in a common structural member. 10. The pump as claimed in claim 8, wherein said diaphragm means is disposed at said pumping chamber such that deflection of said diaphragm means in said first direction increases the volume of said pumping chamber and deflection of said diaphragm means in said second direction decreases the volume of said pumping chamber. 11. The pump as claimed in claim 8, wherein said outlet valve flap is movable to a position intermediate the open and closed positions of said outlet valve flap to permit communication between said fluid discharge means and said air chamber while said fluid discharge means communicates with said pumping chamber, whereby fluid pumped from said pumping chamber into said fluid discharge means is permitted to flow through said bleed hole into said air chamber. 12. The pump as claimed in claim 8, wherein said reciprocating means include a crankshaft connected to said diaphragm means. 13. The pump as claimed in claim 12, wherein said reciprocating means further include drive means and means for eccentrically joining said drive means to said crankshaft. 14. A pump for use with a fluid reservoir container, said pump comprising a frame, a chamber member secured to said frame, said chamber member having a recess, a diaphragm disposed across said recess intermediate said frame and said chamber member to define a pumping chamber therebetween, a fluid passage member secured to said frame adjacent said chamber member and defining a fluid inlet passage and a fluid outlet passage therein, said inlet and outlet passages being communicable with said pumping chamber, an inlet valve provided between said fluid inlet passage and said pumping chamber, an outlet valve provided between said fluid outlet passage and said pumping chamber, an elastomeric sheet disposed between said chamber member and said fluid passage member, said inlet valve and said outlet valve comprising respective deflectable flaps integral with said elastomeric sheet, said fluid passage member including an air chamber therein in communication with the fluid in said container and venting means for venting said air chamber to atmosphere, said fluid passage member including a bleed hole for permitting communication between said fluid outlet passage and said air chamber, said outlet valve flap, when deflected to its fully open position, closing said bleed hole and interrupting communication between said fluid outlet passage and said air chamber.