Study On Inhibiting Pulsation Of The New High-pressure Piston-type Fire Pump

The mainly fire pump currently used in fire water supply equipments iscentrifugal pump, whose pressure is low. And now the highest pressuredouble-impeller centrifugal pump (4MPa@25L/s) used in super high-rise buildingwas produced by Darly in USA, which is expensive and can’t meet existing demandfor high-rise building fire water supply. This thesis first developed a new piston-typefire pump based on the concrete ultra-high pressure pumping technology of doublepiston cylinder to solve the fire extinguishing problem on super high-rise building,with high pressure and large flow rate, high efficiency and low cost, and studiedcharacteristics of pulsation. But the phenomenon of shock, vibration and pulsation offlow and pressure are appeared in the commutation process. So theoretical andexperimental research on the pulsation characteristics are studied in this thesis.The piston pump structure of double double–acting cylinders driven by hydraulicsystem with two pump confluence and two cylinders alternately staggered pumpingway, the accumulator used in oil and water, and suitable commutation overlap areproposed to solve the problem of pulsation. The output characteristics of fire pistonpump are analyzed and verified by theory, AMESim simulation and prototypeexperiment. And the results showed that the high-pressure piston-type fire pump canachieve continuous water supply. The flow rate is constant. The pressure pulsation ismainly appeared in the time of pistons’ commutation, and increases with flow,because of the inherent time of inlet and outlet check valves opening and closing andthe compressibility of oil. And the pulsation could be well inhibited by setting suitablecommutation overlap and accumulator parameters to meet operating requirements.