基于FLUENT的陶瓷砖压机阀口与孔道的仿真研究

发布时间：2018-06-04 11:08

本文选题：砖压机 + FLUENT　；参考：《广东工业大学》2015年硕士论文

【摘要】：二通插装阀、充液阀和集成块是陶瓷砖压机液压系统中三种重要基础元件。二通插装阀阀芯在运动过程中的运动特性、充液阀通流能力和集成块内部孔道能量损失直接影响到陶瓷砖压机能耗、快速性和稳定性。基于国家产业结构升级为提高企业核心竞争力,企业需要生产出更节能、更高效、控制更稳定的陶瓷砖压机,因此对压机上插装阀、充液阀、集成块的研究具有重要意义。本文以佛山恒力泰机械有限公司YP3500陶瓷砖压机液压系统作为研究对象,对二通插装阀、充液阀和集成块孔道的流场进行分析,为企业在阀与集成块孔道的结构设计安装方面提供具有实用价值参考依据。1)建立了插装阀稳态液动力的数学模型,并分析了基于多相流陶瓷砖压机充液阀的研究方法。理论计算出插装阀过流面积、稳态液动力和通流量,及充液阀混合相的密度和通流量。并对插装阀稳态液动力、多相流的影响因素进行分析,为仿真模型的验证提供理论基础。2)建立插装阀、充液阀及集成块流道的三维几何模型,运用Gambit进行网格划分,导入Fluent中对流体模型进行参数设置和求解仿真。通过仿真研究得到如下结论：(1)在相同压差下随着插装阀开度的增大,其压力场、速度矢量场在阀芯与阀套的过流面处变得复杂,流速分离严重,流动更加不均匀；工艺容腔处形成漩涡变大。并由仿真得出：插装阀在不同开度及压差下稳态液动力和通流量值。(2)相同压差下气体体积率越大,液压油通过充液阀流量越大,动梁下行速度越快,但是砖压机稳定性越差。改变压差和气体体积率大小对充液阀过流面压力场、速度场及气相分布趋势影响不大;从充液阀入口圆孔下来的流体在阀中间位置产生漩涡,能量损失比较大,因此需要后续结构优化过程中消除漩涡区。(3)分析了集成块孔道拐弯处的流场分布情况,发现：随着压差的增大,拐弯处的流体回流运动更加激烈,主流与内壁面的流速分离严重,流动不均匀形成漩涡更加明显,能量损失大。3)对充液阀和集成块结构优化后的流场进行分析。(1)充液阀结构优化后,明显消除了从圆孔下来的流体在阀中间位置产生的漩涡区,减小了能量损失。对比分析了充液油箱上腔加入气体和没有加入气体这两种情况对砖压机运行快速性和稳定性的影响。(2)增大集成块上的插装阀开度,及减小插装阀进油口与集成块孔道交叉处的距离,有利于减小集成块的压力损失从而有效降低砖压机能耗。
[Abstract]:The two-way cartridge valve, the filling valve and the integrated block are three important basic components in the hydraulic system of ceramic tile press. The movement characteristics of two-way cartridge valve core in the process of movement, the flow capacity of the filling valve and the energy loss of the inner hole of the integrated block directly affect the energy consumption, rapidity and stability of the ceramic tile press. Based on the upgrading of national industrial structure to improve the core competitiveness of enterprises, enterprises need to produce more energy-saving, more efficient, more stable ceramic tile press, so it is of great significance to study the upper cartridge valve, liquid filling valve and integrated block of the press. In this paper, the hydraulic system of YP3500 ceramic tile press of Foshan Henglitai Machinery Co., Ltd is taken as the research object, and the flow field of two-way cartridge valve, liquid-filled valve and mandrel hole is analyzed. The mathematical model of the steady hydraulic power of the cartridge valve is established, and the research method of the filling valve based on the multi-phase flow ceramic tile press is analyzed. The flow area of cartridge valve, the steady state hydraulic power and flux, and the density and flux of the mixed phase of the valve are calculated theoretically. The influence factors of steady hydraulic power and multiphase flow of cartridge valve are analyzed, which provides theoretical basis for verification of simulation model. (2) Three-dimensional geometric model of cartridge valve, liquid-filled valve and manifold flow channel is established, and Gambit is used to mesh the valve. The parameter setting and solution simulation of the fluid model are carried out in Fluent. The simulation results show that under the same pressure difference, the pressure field and velocity vector field become more complex at the flow surface between the valve core and the valve sleeve, the velocity separation is serious, and the flow is more uneven with the increase of the opening of the cartridge valve. The swirl formed at the cavities of the process becomes larger. The simulation results show that the larger the volume ratio of gas under the same pressure difference, the greater the flow rate of the hydraulic oil passing through the filling valve, the faster the downlink speed of the moving beam, but the worse the stability of the brick press. Changing the pressure difference and the volume rate of gas has little effect on the pressure field, velocity field and gas phase distribution trend of the filling valve, and the fluid coming from the round hole at the inlet of the filling valve produces whirlpool in the middle of the valve, and the energy loss is relatively large. Therefore, it is necessary to eliminate the vortex region in the following structural optimization process. (3) the flow field distribution at the corner of the integrated block is analyzed. It is found that with the increase of the pressure difference, the flow back motion at the corner becomes more intense. The separation of the flow velocity between the main stream and the inner wall is serious, and the vortex formed by the non-uniform flow is more obvious. The energy loss is large. 3) the flow field after the optimization of the filling valve and the integrated block structure is analyzed. 1) after the structure optimization of the filling valve, the structure of the valve is optimized. The vortex region produced by the fluid coming from the circular hole in the middle of the valve is eliminated obviously, and the energy loss is reduced. The effect of adding gas on the upper chamber of the tank and not adding the gas to the running speed and stability of the brick press is compared and analyzed, which increases the opening degree of the cartridge valve on the integrated block. Reducing the distance between the inlet of the cartridge valve and the hole of the block is helpful to reduce the pressure loss of the block and reduce the energy consumption of the brick press effectively.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.621

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