Leak-Preventing Device for a Pump

Abstract

A pump includes a shell, an air-pumping device, a cover, a valve and a buoyant. The air-pumping device is used for pumping air out of the shell and therefore pumping liquid into the shell. The cover includes an opening and channel defined therein. The cover is attached to the shell and the air-pumping device. The shell is in communication with the exterior thereof via the opening. The shell is in communication with the air-pumping device via the channel. The valve is movable between a first position for releasing the channel and a second position for blocking the channel. The valve is in the second position as the pump is in an inverted position. The buoyant is used for moving the valve to the second position as the pump is almost full of liquid in an upright position.

1 . A pump including:
 a shell;   an air-pumping device for pumping air out of the shell, thus pumping liquid into the shell;   a cover including an opening and channel defined therein, wherein the shell is in communication with the exterior thereof via the opening and in communication with the air-pumping device via the channel as the cover is attached to the shell and the air-pumping device;   a valve movable in the shell between a first position for releasing the channel and a second position for blocking the channel, wherein the valve is in the second position as the pump is in an inverted position; and   a buoyant for moving the valve to the second position as the pump is almost full of liquid in an upright position.   
     
     
         2 . The pump in accordance with  claim 1 , further including a long tube connected to the cover and formed with a tunnel in communication with the tunnel defined in the cover, wherein the valve is movably located in the long tube. 
     
     
         3 . The pump in accordance with  claim 2 , wherein the buoyant is movably located in the long tube. 
     
     
         4 . The pump in accordance with  claim 2 , wherein the buoyant is movably located outside the long tube. 
     
     
         5 . The pump in accordance with  claim 4 , wherein the valve includes a first end movably located in the long tube and a second end movably located outside the long tube. 
     
     
         6 . The pump in accordance with  claim 2 , further including a short tube extending from the cover and including a tunnel in communication with the channel defined in the cover, wherein the long tube is connected to the short tube. 
     
     
         7 . The pump in accordance with  claim 6 , wherein the short tube includes a thread extending on an external side thereof, wherein the long tube includes a thread extending on an internal side thereof for engagement with the thread of the short tube. 
     
     
         8 . The pump in accordance with  claim 1 , furthering including a ring fit in the long tube and used for contact with the valve. 
     
     
         9 . The pump in accordance with  claim 6 , wherein the ring includes a frusto-conical aperture defined therein, wherein the valve is a ball for firm contact with an internal side of the ring. 
     
     
         10 . The pump in accordance with  claim 1 , wherein the valve is a ball. 
     
     
         11 . The pump in accordance with  claim 1 , wherein the valve is formed with a boss for blocking the tunnel defined in the cover. 
     
     
         12 . The pump in accordance with  claim 1 , further including a ball in contact with the valve. 
     
     
         13 . The pump in accordance with  claim 12 , wherein the ball is solid. 
     
     
         14 . The pump in accordance with  claim 12 , wherein the ball is hollow. 
     
     
         15 . The pump in accordance with  claim 12 , wherein the valve includes a recess defined therein for receiving the ball. 
     
     
         16 . The pump in accordance with  claim 1 , wherein the air-pumping device includes a cylinder located in and connected to the shell, a flexible piston movable in the cylinder, a rod connected to the flexible piston, a handle connected to the rod, and a check valve attached to an end of the cylinder. 
     
     
         17 . A pump including:
 a shell;   an air-pumping device for pumping air out of the shell and therefore pumping liquid into the shell;   a cover including an opening and a channel defined therein, wherein the shell is in communication with the exterior thereof via the opening and in communication with the air-pumping device via the channel as the cover is attached to the shell and the air-pumping device;   a first valve movable in the shell between a first position for releasing the channel and a second position for blocking the channel;   a buoyant for floating on liquid pumped into the pump and moving the first valve to the second position as the pump is almost full of the liquid in an upright position; and   a second valve A movable in the shell between a first position for releasing the channel as the pump is in the upright position and a second position for blocking the channel as the pump is in an inverted position.   
     
     
         18 . The pump in accordance with  claim 17 , wherein the cover includes a pocket B that intersects the channel, wherein the second valve A is movably located in the pocket B.