【作者】 李宾；

【导师】 丁凡；

【作者基本信息】 浙江大学 ， 机械电子工程， 2006， 硕士

【摘要】 椭圆齿轮流量计是市场占有份额比较大的一种通用流量计。椭圆齿轮流量计采用容积式计量，具有计量精度高、油温影响和压力损失小、安装简单、性能稳定、量程范围大等特点，被广泛应用。但传统的椭圆流量计仅能应用在低压环境，高压环境下的齿轮容积式流量计大多从国外进口。提高椭圆齿轮流量计的耐高压性能，有助于增加其应用场合，更好地满足日益提高的市场需求。 在综合国内外文献资料的基础上，对流量计的发展历史、现状及发展方向进行了论述，并对几类主要流量计进行了关键参数比较。探讨了椭圆齿轮流量计的发展现状、工作原理以及优、缺点。论文提出了新型耐高压双向椭圆齿轮流量计的结构方案；并对椭圆齿轮副的结构特性进行了理论分析，得到了椭圆齿轮副在恒流量下的脉动啮合曲线。对其主要特性如泄漏特性，压力损失特性等进行了理论分析。根据耐高压双向椭圆齿轮流量计高压计量室的特点提出了磁敏检测的结构方案。对磁敏传感器和永磁磁钢的工作特性进行了研究。通过有限元仿真分析，确定了磁敏检测结构的基本元件和主要结构参数。针对耐高压双向椭圆齿轮流量计的特性研制了液压试验台，试验结果表明，工作压力小于21MPa时，样机的检测流量误差为±0.5％；工作压力大于21MPa至31.5MPa时，误差为±0.5～3％。当流体从不同油口流入样机时，双通道磁敏传感器采集的方波信号相位不同，通过对比两方波信号的相位超前与滞后，可判断流体流动方向。该椭圆齿轮流量计能够承受31.5MPa的高压，并且在背压低于15MPa情况下压力损失较小，最大为0.15MPa。耐高压双向椭圆齿轮流量计具有耐高压，可双向测量流体流量，磁敏传感器非接触方式测量，油温影响和压力损失小的优点，本文所完成的研究工作为进一步的研究和开发打下了基础。 有关各章内容分述如下： 第一章，在综合国内外文献的基础上，对流量计的发展历史和目前流量计市场的现状及发展方向进行了论述，并对几类主要流量计进行了关键参数比较。探讨了椭圆齿轮流量计的发展现状、工作原理以及优、缺点。针对目前椭圆齿轮流量计发展现状，提出本论文的研究意义和研究内容。 第二章，提出了新型耐高压双向椭圆齿轮流量计的结构方案。该流量计主要由下端盖、壳体、上端盖、椭圆齿轮副、齿轮轴、磁钢、磁敏传感器等组成。对椭圆齿轮副的结构特性进行了理论分析，包括其节曲线方程和齿廓参数等。并对椭圆齿轮副的脉动啮合特性进行了理论分析，得到了恒流量下椭圆齿轮副的脉动啮合曲线。 第三章，针对本文提出的新型耐高压双向椭圆齿轮流量计结构，对其主要特更多还原

【Abstract】 As an important style of flowmeter, Elliptical Gear Flowmeter has been widely used in many sections of national economy and social surroundings due to its advantages such as positive displacement, high precision, low fluence of flow temperature and pressure loss, easy fixing, stable performance, and excellent repeatability. But traditional elliptical gear flowmeter can be used only in low pressure. Improving its performance can be beneficial to enhance the application situations, better satisfy the market requirements and push the development of the flowmeters.The thesis deeply analyzed and researched the elliptical gear flowmeter, utilizing theory analysis, finite element numerical computation and experimental study. A new style high pressure bi-directional elliptical gear flowmeter is put forward. The characteristics of gear structure is analyzed and the graph of impulsive engaging in constant flows is received. The leakage and pressure loss of elliptical gear flowmeter is discussed, too. The new plan of magnetic-sensing detection is presented, whose elements and structure parameters are selected with finite element numerical simulation. The test-rig is put up, and the experimental results indicate that the error of flowmeter is ±0.5% when it is in pressure of 21MPa, ±0. 5～3%when it is in pressure of 31.5MPa. Twin-channel magnetic-sensing detection can show the direction of flow. This flowmeter can endure high pressure of 31.5MPa, and its pressure loss is low to 0.15MPa. This high pressure bi-directional elliptical gear flowmeter can endure high pressure of 31.5MPa, measure bi-directional flows, with twin-channel magnetic-sensing detection and low pressure loss. These can be used for the further research.In chapter 1, based on the research information widely overseas, the history of flowmeters is introduced, with their classification and comparison. The development, structure character, working principle, advantage and disadvantage of elliptical gear flowmeter are discussed respectively.In chapter 2, a new style high pressure bi-directional elliptical gear flowmeter is presented, with its structure and principle being introduced. The characteristics of gear structure and its key parameters including pitch curve and tooth profile are analyzed. The graph of impulsive engaging in constant flows is received.In chapter 3, the main characters of elliptical gear flowmeter are discussed,更多还原