液压泵是液压系统的重要组成设备液压泵在建筑、采矿、冶金、石油化工、食品等工业中应用广泛，主要是由泵单元和油缸单元组成液压泵选用是否正确及能不能发挥作用都会直接影响到液压泵的工作性能和使用寿命正确使用液压泵是保证工程正常运转的重要条件。
下面以某液压泵为例来讲解如何挑选合适的液压泵 一、泵的分类 液压泵按输送介质分类可分为：油介质泵三种其中油介质泵是由两个以上工作腔相通的油口（可分为多级单腔和多级双腔）而进行泵送工况的液压泵液压泵工作时产生的压力和流量主要由油缸的出口压力和出口流量决定，因此其性能和工作效率均较高。
此外还有油泵、液动压泵和液动堵泵等其他类型液压泵 二、参数选择 确定液压泵的排量和压力后应考虑油缸的额定输出扭矩和其他参数，如排量通常我们根据排量来选择液压泵型号，通常可以将排量设定为6L/min根据上述参数，选择合适的液压泵，才能达到理想的输送性能。
流量：按额定流量选择额定流量与额定输出扭矩的比值越大，则流量越大，压力越大液压泵的流量与液压系统的压力也有很大关系，压力越大液压泵的扬程就越高 三、选择条件 1.泵单元是将压力液体输送至所需位置的机器泵单元包括油缸、油管和油路。
2.油缸单元：油缸是液压泵的核心部件3.油路由液压泵输送的液体和通过的通道组成4.工作压力：选择高压力液压泵时必须考虑实际工作压力值、流量要求等实际情况5.冷却系统：当需要冷却时，一定要选用高效节能的冷却设备。
四、使用注意事项 液压式机械密封具有耐高温、耐腐蚀的特点，长期工作后有较好的密封性能在工业应用中要经常注意液压式机械密封的润滑情况，如油温过高或不正常润滑时均会引起故障同时液压式机械密封易发生泄漏，会引起振动或噪声，严重时可造成人身伤亡和设备损坏。
选择一台符合要求的液压泵非常重要，对于经常使用的液压泵要注意其设计结构的合理性，一般要考虑其结构的合理性及工作性能与安全性两个方面在进行液压泵的选型时要根据用户要求选用相应型号的液压泵在进行液压泵的安装时要注意其安装位置的合理性及安装的稳定性、可靠性。
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