| 摘要 |
A rotatably driven positive displacement pump including a tubular conduit with a barrel communicating therewith, the barrel having a plurality of pairs of spaced apart fluid inlet and fluid outlet ports, each port being controlled by a unidirectional valve, a piston reciprocally supported within the barrel between each pair of inlet and outlet ports, each piston being tubular and having a continuous substantially sinusoidal wave-shaped groove in the interior surface and a groove in the exterior surface in a plane of the piston cylindrical axis, a pin extending from the side wall for each piston and into the exterior groove to permit axial displacement, but limiting the rotation of the piston, a drive shaft rotatably received within the barrel and within each piston opening and a crank member affixed to the drive shaft for each piston and extending within the wave-shaped groove in the internal surface of the piston so that as the crank shaft is rotated, the pistons are axially displaced within the barrel and are displaced in a sequence wherein adjacent pistons alternately move towards and away from each other whereby fluid is pumped into the inlet ports between pairs of pistons as the pistons move away from each other and out the outlet ports between pairs of pistons as the pistons move towards each other.
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