主动减震系统摆线泵卸荷槽的流场特性

Flow field characteristics of unloading groove of gerotor pump of active vibration damping system

针对传统摆线泵转速恒定且转速低,应用于主动减震液压悬架系统宽转速运行工况时,存在压力脉动大、容积效率低的问题,从摆线泵配流副结构参数的角度,研究宽转速工况下配流副齿形圆卸荷槽对其流场特性的影响.通过建立不同结构形式的齿形圆卸荷槽配流副三维模型,研究不同齿形圆卸荷槽在变负载及变转速工况条件下的压力脉动及容积效率.研究结果表明:负载条件一致时,高转速工况下齿形圆卸荷槽可提高摆线泵容积效率、降低输出压力脉动,同时增大摆线泵入口压力能够有效提高其容积效率;当转速为5000 r/min时,无卸荷槽的容积效率为91.8%,全齿形圆卸荷槽摆线泵的容积效率为92.3%;全齿形圆卸荷槽摆线泵输出压力脉动小于无齿形圆卸荷槽摆线泵压力脉动,2种结构对应的摆线泵在宽转速范围内的压力脉动最大差值为0.71%;恒转速时,负载压力越大,摆线泵容积效率越小,压力脉动值越小.

The traditional gerotor pump has a constant and low speed,and also the problems of large pressure pulsation and low volumetric efficiency when it is applied to the wide speed operating conditions of the active shock absorption hydraulic suspension system.Therefore,the article from the perspective of the structural parameters of the distribution pair of the gerotor pump,the influence of the tooth-shaped circular unloading groove of the distribution pair on the flow field characteristics under the condition of wide rotational speed were studied.By establishing three-dimensional models of the tooth-shaped circular unloading groove distribution pair with different structural forms,the pressure pulsation and volumetric efficiency of the tooth-shaped circular unloading grooves of different distribution pairs under variable load and speed conditions were studied.The results show that the tooth-shaped circular unloading groove can improve the volumetric efficiency of the gerotor pump and reduce the output pressure pulsation under the condition of high speed when the load conditions are consistent.At the same time,increasing the inlet pressure of gerotor pump can effectively improve volumetric efficiency.When the speed is 5000 r/min,the volumetric efficiency of the pump without unloading groove is 91.8%,and the volumetric efficiency of the gerotor pump with the unloading groove structure is 92.3%.The output pressure pulsation of gerotor pump with full tooth-shaped circular unloading groove is less than that of gerotor pump without tooth-shaped circular unloading groove.The maximum difference of the pressure pulsation of the gerotor pump corresponding to the toothed circular unloading groove of the two structures is 0.71%in a wide speed range.At constant speed,the larger the load pressure,the smaller the volumetric efficiency of the gerotor pump,and the smaller the pressure pulsation value.