| 摘要 |
A manual pumping apparatus for the delivery of water from a deep well to the ground surface. The pumping apparatus consists of a surface mounted drive unit, a handpump lever operated handle, a sub-surface pump unit, and a water filled flexible riser pipe connecting the drive and pump units. The pumping operation is commenced by the downward movement of the handpump lever handle which forces a drive unit piston disc downward by means of connecting linkage rod. Water is forced down the flexible riser pipe below the piston disc closing a check valve on the upper end of a hollow pump rod to increase water pressure and hydraulically force the pump rod to slide downward and compress a helical coil spring located at the base of the pump unit. Leather seals on the piston discs and one way check valves at each end of the hollow pump rod prevent water leakage between pump components and maintain the driving force due to the increasing water pressure in the handpump system. As the increased water pressure compresses the helical coil spring and forces the lower piston disc downward, a check valve opens and permits water to enter an expanding volume of space, or storage chamber, between two pump unit reservoir cylinders of different diameters. The upward movement of the handpump lever handle releases the water pressure allowing the compressed helical coil spring to expand which forces the storage chamber water up the riser pipe to the drive unit reservoir cylinder and out the discharge nozzle. The deep well handpump is designed to be simple to operate, inexpensive to manufacture with readily available parts, easy to maintain and repair, and capable of extended periods of reliable operation. The use of a flexible connecting riser pipe between the drive and pump units for energy transfer and water flow is a significant improvement over the common method using of a metal connecting rod which is subject to mechanical breakdown. The deep well handpump will be useful in rural areas of under-developed countries where simplicity and reliability are important, and where maintenance can best be done by local labour with few tools using simple components.
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