| 摘要 |
PCT No. PCT/IB94/00095 Sec. 371 Date Jan. 5, 1996 Sec. 102(e) Date Jan. 5, 1996 PCT Filed May 5, 1994 PCT Pub. No. WO94/25755 PCT Pub. Date Nov. 10, 1994A hydraulic fluid-driven, multicylinder, modular, reciprocating piston pumping machine of non pulsating flow and independently variable forward and return stroke speeds comprises several pumping modules (A, B . . . E) each having one primary cylinder (A1, B1 . . . E1) and one secondary cylinder (A2, B2 . . . E2) coaxially joined by an angularly and radially oscillating bushing (100) through which slides a piston rod (A3, B3 . . . E3) with an angularly oscillating piston (A4, B4 . . . E4; A5, B5 . . . E5) at each of its ends. Each primary cylinder (A1, B1 . . . E1) has the end opposed to the bushing closed by valve monifolds (A11, B11 . . . E11) interconnected through a pressurized hydraulic fluid distritubor conduit (5) through which pressurized hydraulic fluid is supplied to the primary cylinder of each module by at least one hydraulic pump (1, 2). A hydraulic fluid chamber (A18, B18 . . . E18) formed in each primary cylinder by the piston back, said bushing (100), the rod's surface and the cylinder's interior wall, communicates with all such chambers (A18, B18 . . . E18) of the rest of the modules by a distributor-collector conduit (11 ) provided with at least one hydro-pneumatic accumulator (12) connected to a relatively large, second supplementary gas reservoir (23) constituting a volumetric compensator for all the hydraulic fluid contained in all said chambers (A18, B18 . . . E18), and at the same time providing pressure for the pistons back stroke. One or more further hydro-pneumatic accumulators (8) are provided in a return fluid collector connected (7) to the valve manifolds (A11, B11 . . . E11), and further individual hydro-pneumatic accumulators (A14, B14 . . . E14) are provided for the valve manifolds (A11, B11 . . . E11).
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