【作者】 张鹏；

【导师】 上官文斌；

【作者基本信息】 华南理工大学 ， 车辆工程， 2015， 硕士

【摘要】 近些年,世界各国对车辆的节能环保越来越重视,应运而生的直喷发动机、混合动力和电动汽车得到大力的发展,但一些过时技术的淘汰也导致相关零部件的功能被取代,比如原先汽车真空助力制动系统所需的真空来自进气歧管,现如今主要依靠真空泵来提供。本文研究的膜片式电子真空泵是车用真空泵的一种,属于干式真空泵,其高密封性,长耐久性,以及振动小噪声低等特点较为突出,它将在未来的中高档汽车零部件市场占有重要地位。本文以某款膜片式电子真空泵为研究对象,基于真空工程技术和有限元分析理论,研究分析了膜片式真空泵的抽气性能预测、关键零部件的结构优化和产品性能提升等问题。这些研究工作可归纳如下:根据膜片式电子真空泵的结构,分析其工作原理及气体状态参数变化;根据膜片式真空泵的抽排气状态,建立其抽气性能数学模型;利用ABAQUS软件结合Delaunay三角网剖分方法计算抽气性能数学模型中重要输入参数工作容积的变化规律;对膜片式电子真空泵样机进行抽气性能试验研究,将试验结果与抽气性能数学模型的计算结果对比分析,验证该数学模型的合理性;结合有限元分析结果,优化膜片、上泵体和下泵体的形状。抽气性能的预测结果与实测结果的对比分析表明,基于有限元仿真确定膜片式真空泵的工作容积变化规律,并结合抽气性能数学模型的分析方法是合理有效的,计算结果精度满足工程要求。通过本文的研究,可以在膜片式真空泵的设计开发阶段,较精确地预测产品抽气性能,缩短产品开发周期,优化设计膜片和上下泵体的结构,延长产品使用寿命。更多还原

【Abstract】 In recent years, with various countries paying more attention to environmental protection and energy saving, gasoline direct injection engine, hybrid and pure electric vehicle gain more development, and the technology out of fashion leads to failure of some parts function. For example, instead of the engine intake manifold, the vacuum pump plays an main role in the vacuum source of a car vacuum booster brake system. The vacuum pump in this paper is a diaphragm vacuum pumps for automobile, which belongs to dry vacuum pumps and has the advantages of good sealing performance, long durability, small vibration and low noise. Though its manufacturing cost is high, it will play an important role in the future of the medium and high-grade automobile parts market.Based on the vacuum engineering technology and the finite element theory, this paper takes a diaphragm vacuum pump as the object of study, and a series of issues for pumping performance prediction, structure optimization of key parts and performance promotion, are investigated. The major studies can be summarized as follows: based on the structure of diaphragm vacuum pump, its working principle and gas state change are studied; The mathematic model for pumping performance of a diaphragm vacuum pump is presented on the basis of the state of inlet and exhaust; the working volume in the mathematic model for pumping performance is calculated in the way of coombining finite element analysis with constrained delaunay triangulation; the calculation data is compared with the experiment, and the comparison is used to verify the rationality of the mathematic model for pumping performance; the structure of the diaphragm and pump body are optimized in considerating of strain distribution in diaphragm.The vacuum achievement time and the variation of vacuum with pump time are employed to evaluate the pumping performance of the diaphragm vacuum pump. Corresponding performance test is conducted to verify the proposed model and calculation approach. A good agreement between the test results and the calculated results is achieved. It concludes that the presented model is capable of characterizing the pumping performance with reasonable accuracy. The proposed calculation method can facilitate the design of any vacuum pumps in terms of optimization, shortening develop time and saving cost.更多还原