Leakage and Volumetric Efficiency Analysis and Seal Improvement of Internal Gear Pump with Multi Output

多输出内啮合齿轮泵泄漏与容积效率分析及密封改进

College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China

Received: 8 October 2018

Abstract

Based on the analysis of the structural characteristics of the internal meshing gear pump with multi-output, the main leakage ways in the gear pump are summarized. By establishing the mathematical formula of leakage, the general formula of the total leakage of the gear pump under three working modes is obtained, and the volume efficiency of the pump is calculated. It is concluded that the volume efficiency of the internal meshing gear pump with multi output is the highest when the internal pump is used alone, and the volume efficiency of the external pump alone is the lowest. The structure of internal gear pump with multi output is improved to reduce the leakage and is verified via experiments. The experimental results show that the volumetric efficiency of the pump is consistent with the analysis results, that is, the volume efficiency decreases with the increasing of load pressure of pump.

摘要

基于多输出内啮合齿轮泵结构特性的分析，总结出齿轮泵的主要泄漏途径。通过建立泄漏的数学计算公式，得出3种工作方式下齿轮泵总泄漏量的一般公式，并对泵的容积效率进行了理论计算，得出多输出内啮合齿轮泵采用内泵单独工作时的容积效率最高，外泵单独工作容积效率最低。改进多输出内啮合齿轮泵的结构来减少泄漏，并进行实验验证。实验表明，泵的容积效率总体变化规律与理论分析一致，即随着泵负载压力的升高，容积效率降低。