共查询到20条相似文献,搜索用时 765 毫秒
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利用丝道直径不同的网络器,在各种工艺条件下,对长丝进行网络加工,分析了加工参数(空气压力、超喂率、加工速度)对网络数和网络牢度的影响。利用最小二乘法求得网络数与网络牢度的回归方程,并阐明了网络数与网络牢度之间的关系随丝道直径和加工参数变化的规律。证明了固定的网络器,在一定的工艺条件下,可以通过网络数来估算网络牢度。 相似文献
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为了加工出性能优良的网络丝,设计了5种不同丝道截面形状的网络器。通过测试网络丝的网络度和网络牢度来评价网络丝以及网络器的性能。结果表明:丝道截面形状为椭圆形或倒三角形的网络器的性能优良。同时,还模拟了网络器丝道内部流体的运动方式来说明导致网络器性能优劣的原因。 相似文献
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网络器气道截面形状与截面积对网络加工的影响 总被引:1,自引:1,他引:0
采用截面形状为椭圆形的丝道与截面形状为圆形和正方形的两种气道搭配,并分别取气道截面积与丝道 截面积比为1/2、1/4和1/6来制作网络器,通过改变加工参数来对网络器的加工性能进行试验,分析了网络器气道 截面形状与截面积对网络加工的影响。 相似文献
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高网络低弹丝网络加工技术探讨 总被引:1,自引:0,他引:1
研究探讨了167dtex/36f高网络低弹丝加工技术。为了保证免浆网络丝的网络度和网络牢度,根据设备、工艺现状和产品要求,从喷嘴的进气孔、丝道的形状和大小以及前后导丝器的距离和位置等各方面的影响,对网络喷嘴的结构进行合理设计,并选择合适的工艺条件。 相似文献
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采用16对光纤传感器测量涤纶长丝在椭圆形网络器丝道截面上的运动情况,研究了加工工艺对长丝在网络器丝道内部运动的影响。结果表明:加工气压过小或过大时,长丝都不能在丝道内自由旋转,长时间停留在丝道的上部或顶端;加工气压为0.3 MPa时,有利于网络结的形成;加工速度对长丝在丝道内部的运动影响不大;长丝在丝道截面上的运动轨迹类似横置的数字8。 相似文献
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全面系统地分析了网络丝生产中压缩空气系统的压力变化规律及系统压力波动对网络丝质量的影响,提出了减缓系统压力波动、稳定网络器进口压力、确保网络丝质量的措施。 相似文献
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用统计方法中的析因分析和相关分析,研究了网络加工的3个工艺参数:压缩空气压强、加工速度和喂入率对网络度和网络牢度影响的显著性以及网络度和网络牢度的相关性。结果表明:喂入率对网络度的影响最大;加工速度对网络牢度的影响最大。为了较全面考察网络丝的质量,应该同时考虑网络度和网络牢度。 相似文献
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Wen Jun Li Dao Tong Chong Jun Jie Yan Wei Xiong Chen Jin Shi Wang 《Korean Journal of Chemical Engineering》2014,31(9):1539-1546
The steam-water injector (SI) is a simple mechanical device that has been widely used in industry. We did an experimental study to find the influence of physical and geometrical parameters on performance of the SI. The physical parameters studied were steam inlet pressure, water inlet pressure and water inlet temperature. Whereas, the geometrical parameters studied were steam nozzle area ratio, area ratio of steam nozzle to water nozzle and the mixing section converging angle. Pump head was introduced to evaluate the lifting-pressure performance of the SI under different operating and geometrical conditions. Optimal values of steam nozzle area ratio and mixing section converging angle were 1.3 and 11.6° respectively, for the present work, and optimal value of area ratio of steam nozzle to water nozzle increased with increasing water inlet pressure. Two head-capacity curves were introduced to highlight the effect of various physical and geometrical parameters on the performance of SI. 相似文献
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采用恒温式热线风速仪测自热转化炉内速度分布,用Realizable κ-ε湍流模型对流场进行模拟,其模拟结果和实验结果比较吻合.轴距小于21d0(喷嘴直径)时,轴线速度的衰减规律不受催化剂床层高度和气速的影响.转化炉内回流量随着轴距的增加,先增大后减小;随着催化剂床层高度的增高,回流比分布曲线变窄,回流量最大值为进口流量的6~7倍;轴距小于20d0,催化剂床层高度对回流比大小的影响不大.在实验条件范围内,改变气速,回流比的大小不变. 相似文献
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本文主要叙述了空气压力、变形速度、超喂率、稳定性伸长率及喷嘴类型等工艺参数及原丝材料、单丝纤度及丝条总纤度等原丝参数对喷气变形丝性能的影响。 相似文献
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The experimental study was carried out to optimize the nozzle shape and dimension for the pulse cleaning of a ceramic filter candle. A bench scale unit of ceramic filter consisting of four commercial filter elements was used to measure the traces of the transient pressure around the nozzle and the overpressure in the filter cavity during the pulse-jet injection of pulse gas. Overpressure in the filter cavity is related to the pulse cleaning force. Nozzle design is concerned to increase the overpressure at the open end of filter element of pulse cleaning inlet, as well as to minimize the consumption of pulse gas. Convergent nozzle induces more secondary flow and generates higher pulse cleaning effect than straight nozzle. Nozzles of different convergent ratio (ratio of outlet to inlet diameter of nozzle) by changing the convergent angle and height were tested. The outlet diameter of convergent nozzle seriously influences the cleaning effect. The optimum convergent ratio increases with the increase of pulse gas pressure The nozzle position (distance of nozzle tip from the open end of filter inlet) is also important to decide the nozzle dimension. Nozzle of large outlet diameter accepts high pressure of pulse gas to provide large overpressure in the filter cavity of top position by applying long distance. 相似文献
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