| 摘要 |
The pumping device consists of a string of rods 2 given a reciprocating movement inside a water-raising column 3, several pistons 4 being fixed an equal distance from one another right along the string of rods 2. Each piston 4 comprises a cylindrical piston body 4a secured to the string of rods 2 the end of which piston which points towards the bottom of the water-extracting column 3 consists of a cellular structure including an axial orifice intended for the passage of the string of rods 2, a discharge valve 7 being held against the cellular structure by a tubular element 8 extending into the body of the piston and traversed by the string of rods 2 to which it is also secured. Use for the manual pumping of water, oil or the like. <IMAGE>
|
