挤压式偏心回转泵试验研究

Experimental investigations on extrusive eccentric rotary pump

摘要:

针对传统结构原理泵难以同时具备高压和大流量的性能,设计一种挤压式偏心回转泵,其同时具备离心泵大流量和往复泵高压力的特点. 本研究提出挤压式偏心回转泵的原理及设计方法,推导缸体内腔包络线、转子型线的表达式,对进出口的尺寸、位置进行合理性分析,对曲轴、转子密封系统进行材质、受力等分析,并进行试验测试,研究挤压式偏心回转泵的流量、压力的时间曲线,分析其容积效率、机械效率、水力效率及总效率在不同出口直径时随转速的变化规律. 结果表明:输入功率为17.6 kW、电机转速为800 r/min时,测试泵的流量达32.17 m³/h,压力达1.7 MPa；转速800 r/min以内时,其流量不均匀系数小于2.4%,容积效率在85%以上；转速为800 r/min、出口直径为d时机械效率达最大值90.23%；水力效率随转速的升高而升高,当转速达800 r/min时开始减缓升高或降低；测试泵的总效率在转速为800 r/min、出口直径为d时达最大值60.75%. 挤压式偏心回转泵可以同时具备大流量和较高的压力,可在需求高压和大流量的工况下推广应用.

Abstract:

Traditional pumps cannot have both high pressure and high flow performance at the same time. In order to solve this problem, a rotary eccentric extrusive pump was designed which has the characteristics of high flow rate of the centrifugal pump and high pressure of the reciprocating pump. In this study, the principle and design method of the rotary eccentric extrusive pump were put forward. The expressions of the inner envelope line of the cylinder and rotor profile were deduced. The size and position of the inlet and outlet, the material and force of the crankshaft, and the sealing system of the rotor underwent rationality analysis. A test of the rotary eccentric extrusive pump was carried out, and the curve of flow-time and pressure-time, the variation of volumetric efficiency, mechanical efficiency, hydraulic efficiency, and total efficiency with the change of outlet diameters and motor rate were analyzed. The results show that when the input power was 17.6 kW and the motor RPM（Revolutions Per Minute）was 800 r/min, the flow of the test pump reached 32.17 m³/h and the pressure reached 1.7 MPa. The hydraulic efficiency increased with the increase of RPM and reached a inflection point when the RPM reached 800 r/min. When the RPM was within 800 r/min, the non-uniform coefficient of flow was less than 2.4%, the volume efficiency was above 85%, the maximum of mechanical efficiency was 90.23%, and the overall efficiency reached a maximum of 60.75%. The rotary eccentric extrusive pump is characterized by high pressure and high flow performance at the same time, and is worthy of promotion and application.