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石墨除氣轉子廠家

描述


滑環固定在轉軸上,石墨轉子 random組旋轉時與電刷滑動接觸,將勵磁電流傳遞給旋轉的勵磁繞組。一般滑環(和刷握)的絕緣等級多為B級絕緣。集電環的電極通過適當厚度的絕緣隔離,以保持所需的電氣距離和防污爬電距離。

大型水輪發電機的轉子滑環一般由A3鋼或35SiMn制成。與滑環電刷接觸表面的粗糙度應滿足RaO.81.6的要求,相應電刷的電流密度應為58A cm2。一些通過大電流的滑環還加工有螺旋槽,石墨轉子,以滿足大電流的散熱要求。另外,環的摩擦面鍍有鎘等軟金屬,有利于降低摩擦系數。

電化學刷是以炭黑、焦炭、木炭和當地石墨粉、石墨轉子煤焦油或瀝青為粘結劑,經混合、研磨、壓制、固化(或焙燒)和2500℃以上石墨化處理后加工成半成品。所謂電化學石墨,就是將坯體經過1300%的焙燒,在2500%以上的高溫下固化處理,使其成分中的無定形碳轉化為人造石墨。

另外還有金屬石墨轉子刷子。石墨電刷是由金屬粉末(如銅、銀、錫、鉛等)制成的。)和石墨粉為基本原料,經混合、研磨、壓制、固化(或焙燒)而成。

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