【作者】 王伟；

【导师】 张军；

【作者基本信息】 安徽理工大学 ， 机械设计及理论， 2015， 硕士

【摘要】 在现代液压设备、液压试验系统等中流量信号做为最主要的参数之一,是工程技术人员和研究人员关心且需要监测的。在各种流量测量仪表中,由于容积式流量计具有测量精度高、环境适应性强等诸多优点而被广泛使用。液压系统中的流量计会对系统产生一定的脉动,这对系统的稳定运转是极为不利的,而且在液压系统中会存在流量耦合的诸多问题,因此研究动态流量耦合问题和降低流量脉动方法显得极为重要。本文基于传统齿轮齿轮流量计研究设计了一种三型行星齿轮流量计。本文首先分析了行星齿轮流量计的结构及特点,总结了行星齿轮流量计相对比于普通齿轮流量计其流量脉动更小,对系统的稳定运转及流量测量更有利等优点。并推导出各参数特别是行星齿轮内啮合和外啮合变位系数的计算方法,以求进一步合理化结构及进一步降低流量脉动。其次搭建了基于液压仿真软件的流量耦合关系系统模型,对耦合频率及耦合幅值进行了一系列的研究,分析了耦合频率的跟随性与不变性,以及影响流量耦合幅值的因素与关系。接着设计了流量计动态性能与标定实验台,总结了各部分的设计参数,重点分析了液压集成阀块的设计,并给出设计图,在此基础上加工制造流量计动态性能测试与标定试验台,为相关实验做准备。最后归纳了流量计标定常用的三种方法,对每种方法及参数计算做了推导。利用加工制造的试验台采用称重法进行了流量计的标定工作,并对流量计进行了耐压实验,推导出流量计的计量精度及流量计的耐压性能。更多还原

【Abstract】 Flow rate signal must be measured and controlled by technicians and researchers as one of the monitor parameters in the modern hydraulic equipment and hydraulic test system.Positive displacement flowmeters are widely used because of many advantages like high measuring accuracy and strong adaptability to the working environment among the many kinds of the flowmeters. However, if the positive displacement flowmeters be set up in the hydraulic system, flow and pressure ripple will be generated after the fluid get through the meter, which is extremely detrimental to the stable operation of the system. There are also many problems in the flow coupling of the hydraulic system. So it is important to research on dynamic flow coupling and reduce the flow pulsation.A new planet-gear flowmeter structure based on the structure of the traditional gear flowmeters has been presented in this paper. The structure and characteristics of the planet-gear flowmeter is introduced in this paper. Compared with the traditional gear flowmeters, the pulsation is smaller, it is more beneficial for stable operation and flow measurement system, In the meantime, there are many calculation methods of parameters especially the modification coefficient of internal meshing and external meshing are presented, in order to rationalize the structure and reduce the flow pulsation.With the use of the hydraulic simulation software, a system model has been built to study the coupling relationship. We did a series research on coupling frequency and coupling frequency, which illustrate the following feature and the static feature of the coupling frequency as well as the influencing factors and correlativity on flow coupling amplitudeThen a test bench of flowmeter dynamic performance and calibration has been designed, design parameters of each part are summarized. The design of hydraulic integrated valve block has been mainly introduced and it’s engineering drawing was given in this paper. Based on this, the test bench is manufactured with the function of testing the dynamic performance of flowmeter and calibration, which is prepared for the related experiment. Finally three kinds of flowmeter calibration method has been introduced, each method and parameter calculation has been explained. The calibration and pressure experiment of flowmeter have been done on the test bench, which obtained the measurement precision of flowmeter and illustrates the pressure resistance of flowmeter.更多还原