Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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真空接触器工作原理

2013-12-17 8:21:31      点击:

真空接触器通常由绝缘隔电框架、金属底座、传动拐臂、电磁系统、辅助开关和真空开关管等部件组成。当电磁线圈通过控制电压时,衔铁带动拐臂转动,使真空开关管内主触头接通,电磁线圈断电后,由于分闸弹簧作用,使主触头分断
真空开关管是以上封盖、下封盖、金属波纹管和陶瓷管等组成,该真空开关管,外壳采用95瓷绝缘材料制成波纹式的瓷管,它具有爬电距离大、机械强度高、耐热和耐冲击的特点。真空开关管内封装一对动静触头,触头材料采用耐磨且低截流值的Cu-W-Wc,这样在满足开断性能的条件下,减小开断过程中由于截流引起的过电压,提高了真空开关管的使用电寿命。当金属波纹管轴向运动时带动动触头做分合闸动作。
电磁系统考虑实际吸力特性和反力特性良好配合,以及发挥接触器运行时噪音低、节电的优点,采用滞留双线圈由起动和维持两绕组组成,通过辅助开关切换,为了便于用户进行交流电源操作,接触器带有桥式整流装置。
机械锁扣:当闭合线圈通电时,接触器吸合,机械锁扣锁住:当脱扣线圈通电时,机械锁扣脱扣,接触器释放,脱扣线圈在热态时,其电压在Us85%-110%范围内使接触器可靠释放。

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