一种手术负压管路脚踏负压控制开关的研制

目的:研制一种脚踏式负压控制开关,可对手术负压吸引管路进行开关控制,解决手术高峰经常出现负压吸引系统吸力不够、手术间噪音大及频繁更换真空泵的难题。方法:脚踏负压控制开关由踏板、底板、管夹、硅胶管、负压管接头及复位弹簧组成等部件构成,硅胶管放置在管夹中,硅胶管的两端分别通过负压管接头与负压管路相连接,当需要负压吸引时只需踩下踏板,负压吸引就能顺利进行。结果:采用研制的脚踏负压控制开关能够保持手术过程中的负压吸引管路的负压压力,降低手术室噪音,使用时只需将此开关串入负压吸引系统吸引管路即可。结论:研制的脚踏式负压控制开关具有无需消毒、寿命长、价格便宜及更换方便等优势,可使负压泵的运转时间减少70%左右,并可降低能源消耗与设备维修频次及其费用,适用于各级医院手术室及重症监护病房(ICU)等科室。

巧改油开关根治化油器溢油

如果化油器浮子室油面过高,燃油便会从溢流管往外泄漏.若不是调整不当,浮子破裂,就一定是针阀和阀座已磨损.前两种原因可以改变和修复,后者却很难修复,只能更换针阀、阀座,但有时很难买到配件,即使买得到,价格也很高,如建设·雅马哈JYM150型的一套针阀、阀座组件需要150元.

幸福XF250也能分离润滑

国产250型摩托车大都采用混合润滑的方式润滑钢套活塞.此方式存在许多弊病,如对比不均或临时无机油加等,导致发动机功率下降,使用寿命缩短.

Performance improvement of complementary feeders using static transfer switch system

The performance of complementary feeders, running in parallel, can be significantly improved by installing static transfer switches （STSs） at critical locations. We develop the STS control logic, which transfers the critical load from the preferred feeder to the alternate feeder when a voltage sag or a fault occurs on the preferred feeder. A forced commutation technique is proposed and implemented to turn off the preferred feeders＇ thyristor, thus avoiding cross current to flow and minimizing the transfer time. Simulation results show that the forced commutation technique is more effective as compared to the recently proposed time delay technique for STS operation. Two different feeders, namely New Exchange, the preferred feeder, and Sector 1-10/2, the alternate feeder of Islamabad Electric Supply COmpany （IESCO）, Pakistan, have been selected for case studies. The software PSCAD/EMTDC professional package has been used for simulation.