pump speed 指往复式泵位移元件(柱塞、活塞等)每分钟的往复运动次数，单位：min-1。 对机动泵(由曲柄连杆或凸轮等机构传动)，泵速在数值上等于其驱动主轴的转速(r/min)。
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设计原理是减慢泵速、缩短冲程或改用小泵来降低排量，保持适当的沉没深度。
The design principle is to decrease the pump velocity, reduce stroke or to use a small pump to reduce the pump displacement and keep proper submersible depth.
利用这一特性，把两个万向节机构和圆柱齿轮机构组合形成了叶片差速泵的驱动系统。
By using the characteristics, the combination of two Hooke's joints with cylindrical gear mechanisms forms the driving system of a differential velocity vane pump.
本文着重讨论了制冷机负载特性的变化对现代低温泵的抽速、极限压强、抽气容量等抽气特性的影响。
This paper emphatically discussed about the effects of change of the refrigerator load on pumping speed, limiting pressure, pumping capability etc.
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