| 摘要 |
A high pressure, tandem positive displacement piston pump (10) for pumping a corrosive fluid is disclosed. The pump includes two axially opposed pump bodies each having an inlet (26A, 26A') and outlet (28A, 28A') as well as a plurality of pistons (54, 54') arranged in axially opposed cylinders (51, 51'). A two sided cam device (62) moves each pair of opposed pistons (54, 54') reciprocally and has two opposed first camming surfaces (131, 131') which cyclically rotate. At the end of each piston (54, 54'), a second camming surface is provided which engages the first camming surface. A dynamic bearing system (75, 77, 81) supports the cam device axially and overcomes any imbalance between the opposed pistons. A shaft (66), with suitable journaling device (79, 79'), is preferably used for rotating the two sided cam device. A cooling and lubricating system is also provided for cooling the camming surfaces, the dynamic bearing system, and the journaling device. The coolant liquid can be the corrosive liquid being pumped.
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