Optimization Design And Research Of Automatic Rotating Device Of Multi Fans In Wood Drying Chamber

Wood drying chamber is the most conventional equipment used for drying wood.80% of timber using conventional drying room to dry in China. So effective improve the drying efficiency of wood drying chamber is environmentally and ways to increase product added value.The uniformity of the hot blast’s temperature field and velocity field is to evaluate the performance of the wood drying chamber and ensure the qualityof wood drying in actual production.In this paper, research and analysis of conventional wood drying chamber within single air results the problem in uneven wood drying on both sides before and after stacking, dry cycle is longer, high energy consumption, then ptimization design of the conventional wood drying chamber.Firstly, design the Linkage mechanism gear combinations and Stepless adjusting mechanism for the turning Angle of the fan automatically to realized several fans automatic rotary synchronous.In order to making the heat air supply uniform at the positive and negative postion and solving the wood drying uneven at the both side in the conventional wood drying chamber.Secondly, set up the arc guide plate at the top of the chamber’s front side and back side, the air flow of fan out from the horizontal direction through the arc guide plate turn to 90 °smoothly, evenly distributed to the chamber of the side or the back of the vertical air duct, to avoid the air flow extrusion, entrainment and eddy current power loss.Third, design the automatic control device to control the fans synchronized rotary every 2~4 hours, then realize the requirement of the forward and reverse airflow supply uniform in the drying room.Fourth,build the 3D model of the chamber by the Pro- E software.With SC/Tetra software complete air circulation uniformity in the numerical simulation under different working conditions. Comparing with the single air flow inside the chamber and the forward andreverse circulation flow in the chamber and verified the forward and reverse circulation flow in the optimized chamber can make the wood drying on both sides of stacking, and shorten the drying period, improve the quality of wood drying.Fifth, through experimental test point arrangement records the scene environment, analysis and comparison between the experimental data and simulation data to verify the results of numerical simulation.In this paper, the results of the research show:Using a combination of linkage gear mechanism can effectively implement chamber in more than one fan synchronous rotation of the consistency and accuracy,improve the precision of the transmission, to ensure more positive and negative rotation fan in place at the same time, improve the uniformity of circulating flow, improve the drying efficiency, shorten the drying period, drying to reduce costs, improve the added value of products, at the same time can save energy consumption.Using the fan automatic stepless adjusting mechanism for the turning angle, the agency by chute lever pull rotate, greatly improve the stress distribution, the agency passed smoothly, flexible, lightweight and work efficiency.By adjusting the position of the hydraulic oil cylinder on the guide rail can be easily installed on the rectangular frame many sets of axial flow fan to spin around 180 °direction to speed and Angle.By comparing the conventional wood drying chamber, set the guide plate of air chamber, fan synchronous rotary airflow optimize the chamber under the same boundary conditions. The simulation result shows that the air velocity uniformity effect of conventional wood drying chamber, the air velocity was the lowest average of 1.22, the mean square deviation was 0.23.Optimize airflow chamber air velocity within the average increase to 1.34, the mean square deviation is 0.18, but the arc guide plate supply air flow in the corner have split into two jet stream, effectively improve the stacking wood from top to bottom the uniformity of air supply velocity.At the same time, the direction of the outlet dramatically improve the degree of turbulence. The mean value of fan synchronous rotary flow optimization chamber air velocity is 1.47, the mean square deviation is 0.14, the entire chamber timber clearance between airflow in the airways greater speed, the uniformity of air flow velocity increased significantly, and there is not obvious mutation between the speed of the monitoring.Using the arc guide plate, the air out from the fan flowing through the chamber at the top of the side of the arc guide plate 90 ° smooth turned into the vertical duct, arcguide plate on the corner will supply air flow split into two jet stream, a jet distribution to the top of the stacking lumber, another jet allocated to the wood below the stacking.By arc diversion slabs fan outlet wind speed distribution and guidance, stacking wood from top to bottom the uniformity of air supply velocity increased significantly, the lumber stacking1-4 layer above the uniformity of air velocity to improve is most obvious.The installation of the arc guide plate effectively solving the same drying room internal cause large difference of wood drying effect caused by the uneven drying, drying period prolonged problems, improve the efficiency of the drying room drying.Field test airflow optimized chamber that fan synchronous rotato.On the premise of meet the requirements of drying technology, 40M3 conventional wood drying chamber generally use three fan the power is 2.2-3kW, synchronous rotary airflow of the fan is optimized chamber we use high efficiency fan that the power is 1.1 kW, each chamber can power saving per month about 2000 degrees of above and can save costs about 20000 yuan a year.This is a very direct economic benefits.At the same time, due to the improvement of the hot air flow uniformity that improved the quality of wood drying, drying time shortened at the same time, this aspect also to have certain economic benefits.