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

大发国际

你的位置:首页 > 新闻动态 > 技术动态

热继电器组成结构

2014/2/19 8:55:55      点击:
热继电器  组成结构:它由发热元件、双金属片、触点及一套传动和调整机构组成。发热元件是一段阻值不大的电阻丝,串接在被保护电动机的主电路中。双金属片由两种不同热膨胀系数的金属片辗压而成。图中所示的双金属片,下层一片的热膨胀系数大,上层的小。当电动机过载时,通过发热元件的电流超过整定电流,双金属片受热向上弯曲脱离扣板,使常闭触点断开。由于常闭触点是接在电动机的控制电路中的,它的断开会使得与其相接的接触器线圈断电,从而接触器主触点断开,电动机的主电路断电,实现了过载保护。
热继电器动作后,双金属片经过一段时间冷却,按下复位按钮即可复位。
大发国际