什么是正位移泵？ positive displacement pump a positive displacement pump has an expanding cavity on the suction side of the pump and a decreasing cavity on the discharge side. liquid is allowed to flow into the pump as the cavity on the suction side expands and the liquid is forced out of the discharge as the cavity collapses. this principle applies to all types of positive displacement pumps whether the pump is a rotary lobe, gear within a gear, piston, diaphragm, screw, progressing cavity, etc. a positive displacement pump, unlike a centrifugal pump, will produce the same flow at a given rpm no matter what the discharge pressure is. a positive displacement pump cannot be operated against a closed valve on the discharge side of the pump, i.e., it does not have a shut-off head like a centrifugal pump does. if a positive displacement pump is allowed to operate against a closed discharge valve, it will continue to produce flow which will increase the pressure in the discharge line until either the line bursts or the pump is severely damaged or both. types of positive displacement pumps single rotor - vane, piston, flexible member, single screw multiple rotor -gea,r lobe, circumferential piston, multiple screw 意思就不翻译了，但是类型说一说， 正位移泵的类型包括 单转子-叶片式、活塞式、挠性件泵、单螺杆泵 多转子-齿轮、凸轮泵、环活塞泵、多螺杆泵查看更多
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