The utility model relates to a device for eliminating static electricity of large shaft of steam turbines. The utility model includes a brush arm, a grounding brush, a clamping mechanism, an electrostatic wire, a grounding switch, a grounding grid, a fixed surface of a steam turbine plate, a connection terminal of a clamping mechanism and a large shaft. The clamping mechanism and the large shaft are installed on the fixed surface of the steam turbine plate. The grounding brush is installed at the end of the brush arm, the grounding brush is connected with the large shaft, and the clamping machine is connected. The connection terminal is installed at the other end of the brush arm. The brush arm is tilted on the clamping mechanism. The clamping mechanism is mounted on the side of the connection terminal of the clamping mechanism. One end of the No. 1 electrostatic wire is connected with the connection terminal of the clamping mechanism. The other end of the No. 1 electrostatic wire is connected with one end of the grounding switch and the other end of the grounding switch. It is connected to one end of the two electrostatic conductor, and the other end of the two electrostatic conductor is connected to the grounding grid. By eliminating the electrostatic device of the large shaft of the steam turbine, the static electricity can be introduced into the earth, so as to avoid the electric corrosion of the large shaft of the steam turbine, and damage the bearing bush and the lubricating oil and oil quality.
【技术实现步骤摘要】
一种消除汽轮机大轴静电的装置
本技术涉及一种消除汽轮机大轴静电的装置。
技术介绍
汽轮发电机组的大轴往往是由汽轮机的高压转子、中压转子、低压转子、发电机转子、励磁机转子、副励磁机转子等。这些转子连接成一个轴系,整个轴系通过若干个径向轴(瓦)承和轴向轴承(推力瓦)来支撑,轴上的支撑点称为轴颈,当汽轮发电机在全速运行时,整个大轴是悬浮在所有轴颈与轴瓦之间的油膜之上,因此大轴的电位为悬浮电位。按照电工学基本理论:(1)当电位悬浮状态的金属与其它介质相摩擦时就会积累正或负的静电荷;(2)当电位悬浮状态的金属产生电荷而又难以释放时(因轴瓦的油膜具有较高的绝缘电阻)就可能积累产生高电位。汽轮发电机组的大轴恰好符合以上两个条件。因为汽轮机叶片的高速转动与蒸汽相摩擦、其末1-2级叶片与空气相摩擦、汽轮机的主油泵叶轮与润滑油相摩擦、发电机转子上的风扇与氢气或空气相摩擦等,都会使大轴上积累静电荷,大轴上所积累的静电荷不论是正电荷还是负电荷都集中在汽轮机的叶片尖端,随着汽轮机转子而高速旋转。又根据电工学基本理论,高速旋转的静电荷会在汽轮机的汽缸壁产生涡流。因为汽轮机的汽缸壁是很厚的金属,所以产生的涡流很大。很大的涡流不但会引起能量损耗,而且还会使汽缸的上下结合面和结合面的紧固螺栓烧毛,损坏了设备。另外大轴上积累静电荷所产生的高电压最容易在油膜上发生放电现象,因为油膜的间隙尺寸最小,从而使轴瓦烧毛,也会使润滑油质逐渐劣化。解决上述问题的方法是将大轴接地。接地后的大轴就不再是悬浮电位的金属体了,电荷通过接地点释放到大地,从而使大轴无法积累电荷。大轴接地点一般安装在汽轮机低压缸与发电 ...
【技术保护点】
一种消除汽轮机大轴静电的装置,其特征在于:包括刷臂、接地刷、夹紧机构、静电导线、接地开关、接地网、汽轮机台板固定面、夹紧机构接线端子和大轴,所述夹紧机构和大轴均安装在汽轮机台板固定面上,所述接地刷安装在刷臂的一端,所述接地刷与大轴连接,所述夹紧机构接线端子安装在刷臂的另一端,所述刷臂倾斜安装在夹紧机构上,所述夹紧机构安装在位于夹紧机构接线端子的一侧,所述静电导线包括一号静电导线和二号静电导线,所述一号静电导线的一端与夹紧机构接线端子连接,所述一号静电导线的另一端与接地开关的一端连接,所述接地开关的另一端与二号静电导线的一端连接,所述二号静电导线的另一端与接地网连接。
【技术特征摘要】
1.一种消除汽轮机大轴静电的装置,其特征在于:包括刷臂、接地刷、夹紧机构、静电导线、接地开关、接地网、汽轮机台板固定面、夹紧机构接线端子和大轴,所述夹紧机构和大轴均安装在汽轮机台板固定面上,所述接地刷安装在刷臂的一端,所述接地刷与大轴连接,所述夹紧机构接线端子安装在刷臂的另一端,所述刷臂倾斜安装在夹紧机构上,所述夹紧机构安装在位于夹紧机构接线端子的一侧,所述静电导线包括一号静电导线和二号静电导线,所述一号静...
【专利技术属性】
技术研发人员:邱树良,王学同,王真,宋瑞福,陶蕊,张岩,祝宝营,亓振烨,
申请(专利权)人:华电电力科学研究院,
类型:新型
国别省市:浙江,33
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