【作者】 刘毅；

【导师】 王传礼；

【作者基本信息】 安徽理工大学 ， 机械设计及理论， 2009， 硕士

【摘要】 纯水液压具有环保、安全和清洁等优点,在食品、造纸、冶金等工业领域具有广泛的应用前景。随着材料科学和现代加工技术的发展,使纯水液压元件的研制成为可能,同时随着人们对节约能源和环保的日益重视,纯水液压技术已成为国内外液压界的研究热点。本文首次将纯水液压研究定位在煤矿液压支架安全阀上。本文以煤矿液压支架纯水安全阀为研究对象,采用理论分析、计算机仿真等方法,对其进行系统、深入的分析和研究。在充分考虑水介质特殊的理化性能的基础上,分析了纯水阀存在的关键技术问题,并从材料、密封形式、新型结构等方面入手,提出了相应的解决措施。提出了煤矿液压支架纯水安全阀的具体结构,在不同结构参数条件下进行了流场仿真,并通过安全阀的流量和阀芯受力方程,分析了安全阀的动态性能。本文介绍了纯水液压和安全阀的研究现状,阐述了和分析了纯水安全阀设计的关键技术问题,提出了解决措施。对纯水安全阀的工作原理和结构作了分析,采用滑阀式结构,阀体采用奥氏体不锈钢,阀芯和阀座采用耐蚀合金材料,抗气蚀性能最好,并对其主要尺寸进行了设计。使用FLUENT软件研究纯水安全阀阀芯内部流动,仿真结果表明都在阀芯孔出口处左边边缘出现了最低负压,并且负压都集中在这一块。单从气蚀方面考虑,6孔结构的阀芯产生负压最小,发生气蚀的可能性最小,为优先选择的结构。分析纯水安全阀的结构性能,建立安全阀的数学模型,利用所建立的数学模型对纯水安全阀动态特性作仿真研究分析,得出了影响阀的工作稳定性的主要因素。仿真结果表明纯水安全阀动态特性良好,满足实用要求。最后对全文做了总结,对今后该课题的进一步开展作了一些展望。更多还原

【Abstract】 Water hydraulic will be widely used in some industrial areas,such as food,paper and metallurgy for its advantage of fine condition,safety and cleanness. With the development of material science and modern processing technology, developing water hydraulic component become possible.And human devoting much attention to saving energy and protecting environment,water hydraulic techonolgy become research focus at home and abroad. The thesis firstly analyses the water hydraulic on the safety valve of coal mine hydralic supporter.In the thesis,water safety valve is systematically and deeply researched by combining theory analysis and computer simulation together. Considered the physical and chemical characteristics of water sufficiently, the key technical problems existing in the water valve were analyzed and solved from the aspects of material, seal form, new structures.Concrete structure of Water safety valve used in coal mine hydraulic supporter are presented for the first time. Computational fluid dynamics methods were applied to simulate in the water safety valve spool internal with different structure parameters.Through flow equations of safety valve and force equations of valve core, dynamic performance of safety valve was analyzed.In the thesis, present status of water hydraulic and safety valve is introduced.Key technologies of water safety valve are expounded and solutions are proposed.The structure and working principle of safety valve are analysed,which takes the slide-valve structure,with the valve being made of austenitic stainless steel, valve core and seat made of corrosion resistant materials having the best anti-cavitation performance and its main sizes are designed. FLUENT is used to simulate the flow in water safety valve,the simulation results show that the negative pressure appears in the left edge of the valve hole, which ,moreover,is focused on one point.From the aspect of cavitation,the valve core with 6 holes has a minimum negative pressure and is less likely to get cavitation,.thus being the best choice. the structural preformance of water safety valve is built and its dynamic performance studied.Dynamic performance of water safety valve is simulated using mathematical model.Then the main factors which affects the stability of valve work are obtained. The simulation results indicate that the water relief valve has good performance and can be adopted in practical application.Finally a brief summary on research work of this thesis is provided. Also some researches that need to do by next step are pointed out.更多还原