屋顶纸盒灌装机灌装室气流模拟及优化

Simulation and optimization of air flow in filling chamber of roof carton filling machine

为研究不同速度气流对无菌灌装环境建立的影响,以屋顶纸盒灌装预洁净和灌装工况为研究对象,设置0.5,1.0,1.5 m/s 3种速度的入口气流作为对比,建立欧拉-拉格朗日模型,运用Fluent软件模拟分析预洁净工况颗粒运动轨迹及清除效率,基于动网格技术分析灌装时250,500,1000 mL规格屋顶纸盒运动对灌装室两侧出口气流压强的影响,通过试验验证模拟分析的有效性。结果表明,预洁净工况下,0.5,1.0,1.5 m/s入口气流对于颗粒的清除效率分别为42%,95%,96%;灌装工况下,两侧出口气流压强随入口气流速度增大而增大,随纸盒规格增大而减小;对于1000 mL屋顶纸盒,入口气流1.5 m/s下两侧出口气流压强仍未满足基本要求。通过添加导流板优化入口气流轨迹,显著提高了两侧出口气流压强;所建分析模型及模拟方法有效。研究为此类无菌灌装室气流优化设计提供支撑。

In order to study the influence of aseptic air flow at different speeds on the establishment of aseptic filling environment,the pre-cleaning and filling conditions of the roof carton were taken as the research objects,and the inlet air flow at three speeds of 0.5,1.0 and 1.5m/s was set up as a comparison.Euler-Lagrange model was established,and Fluent software was used to simulate and analyze the particle movement trajectory and removal efficiency under the pre-cleaning conditions.Based on the dynamic grid technique,the influence of the movement of 250,500 and 1000 mL roof cartons on the air pressure at both sides of the filling chamber was analyzed,and the validity of the simulation analysis was verified by experiments.The results show that,under the pre-cleaning condition,the particle removal efficiency at 0.5 m/s,1.0 and 1.5 m/s inlet airflow is 42%,95%and 96%respectively.Under filling condition,the air pressure at both sides of the outlet increases with the increase of inlet air velocity,and decreases with the increase of carton size.For 1000 mL roof carton,the pressure at both sides of the outlet air flow under the inlet air flow of 1.5 m/s still does not meet the basic requirements.The inlet air flow path was optimized by adding a deflector,which significantly improves the air pressure at both sides of the outlet.The established analysis model and simulation method are effective.The study provides a support for the optimal design of air flow in aseptic filling chamber.