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
  • <sup id="cpttk"><center id="cpttk"><input id="cpttk"></input></center></sup>

  • <mark id="cpttk"><center id="cpttk"><dl id="cpttk"></dl></center></mark><s id="cpttk"></s>
  • <s id="cpttk"><i id="cpttk"><form id="cpttk"></form></i></s>

      1. 真空接觸器組成

        2013/12/16 8:26:27      點擊:

        真空接觸器主要由真空滅弧室和操作機構(gòu)組成。真空滅弧室具有通過正常工作電流和頻繁切斷工作電流時可靠滅弧兩個作用。但不能切斷過負荷電流和短路電流。操作機構(gòu)是由帶鐵芯的吸持線圈和銜鐵構(gòu)成。線圈通電,吸引銜鐵,接觸器閉合;線圈失電,接觸器斷開。吸持線圈一般有直流和交流兩種形式。
        真空滅弧室的外殼用玻璃或陶瓷絕緣材料制成,內(nèi)部的真空度通常在0.01Pa以上。由于殼內(nèi)的空氣少,觸頭開距可以做得很小,電弧也較容易被熄滅。觸頭材料一般用銅、銻、鋨等合金制成。滅弧室內(nèi)屏蔽罩的作用是,當(dāng)分斷電流時,凝結(jié)觸頭間隙中擴散出來的金屬蒸汽,有助于熄弧,還可以防止金屬蒸汽濺落到絕緣外殼上降低其絕緣強度。動觸頭與外殼下端用波紋管連接,動觸頭可以上下運動又不會漏氣。

        真空接觸器http://www.mauscontracting.com/Product/diyayuanqijian/zhenkongjiechuqi/

        国产无码在线一区二区观看,人妻av乱片aV出轨中文字幕,18禁在线永久免费观看网站,色综合无码av网站 国产性色在线视频 日韩中文字幕在线
      2. <sup id="cpttk"><center id="cpttk"><input id="cpttk"></input></center></sup>

      3. <mark id="cpttk"><center id="cpttk"><dl id="cpttk"></dl></center></mark><s id="cpttk"></s>
      4. <s id="cpttk"><i id="cpttk"><form id="cpttk"></form></i></s>