极限驾驶工况下的发动机油底壳油面设计要求研究

关于油底壳的油面设计,除了需要保证在正常行驶工况,曲轴不会打到机油液面,还需保证在各种极限驾驶工况下,机油泵都能吸到油,不会出现吸空的现象。本文基于某款发动机的油底壳油面设计过程,分析了油面设计所需要考虑的各种极限驾驶工况以及其所对应的油面倾角的计算过程。

转子式压缩机油量设计方法研究

注油量是转子式压缩机的关键参数,在设计过程中需综合考虑搭载制冷系统的匹数及压缩机本身的压缩腔密封、零部件润滑及冷却的需要。本文研究了一种新的油面设计方法,以某型号产品为例进行了注油量确认,并设计实验验证了该方法的可行性。

Research on the Ultrasonic Extraction Technology of Cottonseed Oil

[ Objective ] To optimize the ultrasonic extraction technology of cottonseed oil by response surface methodology. [ Method ] Based on the single factor experiment, the response surface method with three factors at three levels was adopted according to the principle of central composite design, The optimum extraction conditions of extraction duration, liquid-solid ratio and temperature were determined by regression analysis. [ Re- salt] The best ultrasonic extraction conditions of cottonseed oil were 35 min of extraction duration, 38 ℃ of extraction temperature and 56：6 of liquid-solid ratio. Under these conditions, the extraction rate of cottonseed oil could reach up to 45.81%, with a relative error of 0.13% from the theoreti-cal value of 45.94%. [ Conclusion] The method optimized the extraction technology and laid foundation for the further research of cottonseed oil. Key words Cottonseed oil; Ultrasonic extraction; Response surface method; China