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液压泵的效率试验,通常采用 pQMn 法进行测算;即测出每个工况点的压力 p(MPa)、流量 Q(1/min)、扭矩 M(N·m)、转速 n(r/min),然后按照下列公式进行计算:总效率η≈159⊿p·Q/M·n (1)机械效率η_m≈159⊿p·Q_0/M·n_0(或η_m=η/η_v) (2)容积效率η_v=Q·n_0/Q_0·n (3)式中:⊿P 为泵进出口的压差(MPa);Q_0为空载流量(L/min);n_0为空载转速(r/min)。这种方法测量参数较多,计算公式比较复杂,试验者不易熟练掌握。如果用下述方法进行测试,可使测算过程简化,测试结果更加可靠。现将其原理和测试方法介绍如下:
The efficiency test of the hydraulic pump is usually carried out by the pQMn method. The pressure p (MPa), the flow rate Q (1 / min), the torque M (N · m) and the rotational speed n ), And then calculated according to the following formula: Total efficiency η≈159⊿p · Q / M · n (1) Mechanical efficiency η_m≈159⊿p · Q_0 / M · n_0 (or η_m = η / η_v) Efficiency η_v = Q · n_0 / Q_0 · n (3) Where: P is the pressure difference between the pump inlet and outlet (MPa); Q_0 is the no-load flow rate (L / min); n_0 is the no-load speed (r / min) . This method more measurement parameters, the calculation formula is more complicated, the experimenter is not easy to master. If you use the following test method, the calculation process can be simplified, the test results more reliable. Now the principle and test methods are described below: