Water pumping device by using pressure differential

Abstract

A water pumping device includes a water storage tank, a water tower, a pressure differential pump, and two pumping pipes. The pressure differential pump includes two opposite cylinders, two pistons, a connecting rod, two equivalent-diameter retractable air pipes, and two air control valves. Thus, the air pipes are expanded by the compressed air from the air control valves, and the two pistons are movable reciprocally in the cylinders by driving of the air pipes to introduce the water in the water storage tank through the pumping pipes into the water tower in an alternating manner so as to pump and supply the water into the water tower successively.

1 . A water pumping device, comprising:
 a water storage tank;   a water tower located at a height greater than that of the water storage tank;   a pressure differential pump mounted between the water storage tank and the water tower to deliver water contained in the water storage tank into the water tower;   two pumping pipes each connected between the water tower and the pressure differential pump;   wherein the pressure differential pump includes:   two opposite cylinders separated from each other;   two pistons each mounted in a respective cylinder to define the respective cylinder into an air pressure chamber and a water storage chamber and each movable in the respective cylinder reciprocally to introduce the water in the water storage tank into the water storage chamber of the respective cylinder and to compress the water in the water storage chamber of the respective cylinder through a respective pumping pipe into the water tower;   a connecting rod mounted between the pistons to move with the pistons so that the pistons are movable simultaneously;   two equivalent-diameter retractable air pipes each expandably mounted in the air pressure chamber of a respective cylinder and each having a first end mounted on the respective cylinder and a second end mounted on the respective piston;   two air control valves each mounted on a respective cylinder and each connected to an expandable air compartment of a respective air pipe to introduce an ambient air into the air compartment of the respective air pipe to produce a pressurizing mode to expand the respective air pipe to push the respective piston toward the water storage chamber of the respective cylinder.   
   
   
       2 . The water pumping device in accordance with  claim 1 , wherein the cylinders of the pressure differential pump are mounted in the water storage tank. 
   
   
       3 . The water pumping device in accordance with  claim 1 , wherein each of the cylinders of the pressure differential pump has an open end portion closed by a cover. 
   
   
       4 . The water pumping device in accordance with  claim 1 , wherein the water storage chamber of each of the cylinders is separated from the air pressure chamber by the respective piston. 
   
   
       5 . The water pumping device in accordance with  claim 1 , wherein the water storage chamber of each of the cylinders is connected between the water storage tank and the respective pumping pipe. 
   
   
       6 . The water pumping device in accordance with  claim 1 , wherein each of the air control valves of the pressure differential pump is provided with an air inlet tube to introduce the ambient air into the air compartment of the respective air pipe and an air outlet tube to introduce the air in the air compartment of the respective air pipe outwardly. 
   
   
       7 . The water pumping device in accordance with  claim 1 , wherein the pressure differential pump further includes:
 two water inlet non-return valves each mounted on a respective cylinder and each connected between the water storage tank and the water storage chamber of the respective cylinder;   two water outlet non-return valves each mounted on a respective cylinder and each connected between the respective pumping pipe and the water storage chamber of the respective cylinder.   
   
   
       8 . The water pumping device in accordance with  claim 1 , wherein the pressure differential pump further includes:
 an air filling valve mounted on one of the cylinders and connected to the air pressure chamber of the respective cylinder to fill a determined amount of compressed air into the respective air pressure chamber.   
   
   
       9 . The water pumping device in accordance with  claim 1 , wherein the pressure differential pump further includes:
 a connecting pipe connected between the air pressure chambers of the cylinders so that the air pressure chambers of the cylinders are disposed at an equilibrium pressure balance state.   
   
   
       10 . The water pumping device in accordance with  claim 1 , wherein the pressure differential pump further includes:
 two bushings each mounted in the water storage chamber of a respective cylinder and each mounted on the connecting rod to facilitate movement of the connecting rod.   
   
   
       11 . The water pumping device in accordance with  claim 1 , wherein:
 the water tower is provided with a water outlet pipe connected to a hydraulic generator and a water outlet valve connected between the water outlet pipe and the water tower;   the hydraulic generator is located at a height smaller than that of the water tower.   
   
   
       12 . The water pumping device in accordance with  claim 1 , wherein the water tower is provided with a plurality of water pipe connectors; 
   
   
       13 . The water pumping device in accordance with  claim 12 , wherein at least one of the water pipe connectors is connected to a water supply tube. 
   
   
       14 . The water pumping device in accordance with  claim 1 , wherein the cylinders of the pressure differential pump are spaced from the water storage tank. 
   
   
       15 . The water pumping device in accordance with  claim 14 , wherein the water storage chamber of each of the cylinders is connected to the water storage tank by a water outlet pipe. 
   
   
       16 . The water pumping device in accordance with  claim 1 , wherein the water storage tank is provided with a water inlet pipe to introduce water into the water storage tank. 
   
   
       17 . The water pumping device in accordance with  claim 6 , further comprising:
 a boost pressure controller connected to the air inlet tube and the air outlet tube of each of the air control valves of the pressure differential pump to provide air inlet and air outlet functions;   a pressure compressor connected to the boost pressure controller to supply the compressed air to the boost pressure controller.   
   
   
       18 . The water pumping device in accordance with  claim 1 , wherein the two pistons are movable reciprocally in the cylinders by driving of the equivalent-diameter retractable air pipes to introduce the water in the water storage tank through the pumping pipes into the water tower in an alternating manner so as to pump the water into the water tower successively.