The invention discloses a scroll seal of a steam turbine, which comprises a main body of the seal, a high tooth, a high tooth bevel, a low tooth, an entrance of the chamber, a labyrinth swirl chamber, a guide bevel tooth, a spoiler tooth, a spoiler bevel tooth and a steam end, and is characterized in that the invention adopts a labyrinth swirl chamber to form a swirl vapor flow, and adopts a swirl channel formed by a high tooth and a low tooth arranged in parallel radial direction to make the swirl vapor flow. The high teeth with high teeth and inclined tips are used to further reduce the clearance and effectively prevent the collision and wear damage between the shaft and the high teeth during the start-up of the steam turbine; the steam flow is fully diverted into the labyrinth swirl chamber by the reverse inclination of the guide bevel teeth and the steam flow by 35 degrees; and the turbulent swirl steam flow is fully formed by the small teeth and inclined teeth of the spoiler. Effectively improve the plugging efficiency. Reduce wear and collision between shaft and high teeth. It overcomes the shortcomings of the existing technology.
【技术实现步骤摘要】
一种汽轮机的涡旋汽封
本专利技术涉及一种汽封
,尤其涉及一种汽轮机的涡旋汽封。
技术介绍
汽轮机是高速旋转的大型、精密热功转换动力机械。在汽缸、隔板等静体与主轴、叶片等转体间必须预留一定的轴向和径向间隙,以免机组在工作时动静部件发生碰摩。为了减小汽封间隙的漏汽,必须设置汽封装置,在保证不发生动静摩擦前提下,使汽封间隙处于标准范围内并趋向最小值。这样才能保证多级汽轮机各级和各缸之间减少漏汽损失,提高机组热效率。在汽轮机热功转换的各项损失中,汽封漏汽损失占有很大比重,对汽轮机的热功转换效率有重要影响。汽轮机出现一百多年来,其技术理论已日趋完善,在现有的汽轮机技术理论,制造工艺和应用材料基础上,大幅度提高汽轮机内效率是不现实的,但是通过减小汽轮机汽封与转子动静配合间隙达到减少漏汽的目的,是提高汽轮机运行效率主要途径,同时改造成本远低于通流改造,尤其现代大容量高参数的汽轮机,间隙漏汽对汽轮机效率的影响更大。因此减少汽封间隙漏汽对汽轮机效率的提高至关重要。汽封是汽轮机动静部件之间的过渡部件,极易因汽封体故障而引起汽轮机动静部件之间直接摩擦碰撞,伤及汽轮机大轴,严重时造成大轴永久性弯曲的重大事故。本专利技术采用迷宫涡流腔室形成涡旋汽流;采用径向平行设置的高齿和低齿形成的涡旋流道,使涡旋汽流与轴向进入的汽流成90度碰撞封堵;采用设有高齿斜尖的高齿,进一步减小轴隙,同时有效防止汽轮机启动时轴与高齿的碰撞和磨损损伤;采用导流斜齿与汽流逆向倾斜35度设置,将汽流充分导入迷宫涡流腔室;采用扰流小齿、扰流斜小齿充分形成紊流涡旋汽流,有效提升封堵效率。减轻轴与高齿之间的磨损和 ...
【技术保护点】
1.一种汽轮机的涡旋汽封,包括汽封主体、高齿、高齿斜尖、低齿、腔室入口、迷宫涡流腔室、导流斜齿、扰流小齿、扰流斜小齿、汽端,其特征在于:所述汽封主体轴向断面呈“而”字形,所述汽封主体的汽端径向设有高齿,所述高齿设有高齿斜尖,所述高齿的汽端侧壁靠近齿根部设有扰流小齿,靠近所述高齿径向设有低齿,衔接所述低齿设有腔室入口,所述腔室入口内设有迷宫涡流腔室,所述迷宫涡流腔室设有扰流小齿和扰流斜小齿,衔接所述腔室入口平行设有两个导流斜齿,所述导流斜齿的后面再设有一个所述高齿,且连续设有四个所述迷宫涡流腔室和高齿组,构成所述一种汽轮机的涡旋汽封。
【技术特征摘要】
1.一种汽轮机的涡旋汽封,包括汽封主体、高齿、高齿斜尖、低齿、腔室入口、迷宫涡流腔室、导流斜齿、扰流小齿、扰流斜小齿、汽端,其特征在于:所述汽封主体轴向断面呈“而”字形,所述汽封主体的汽端径向设有高齿,所述高齿设有高齿斜尖,所述高齿的汽端侧壁靠近齿根部设有扰流小齿,靠近所述高齿径向设有低齿,衔接所述低齿设有腔室入口,所述腔室入口内设有迷宫涡流腔室,所述迷宫涡流腔室设有扰流小齿和扰流斜小齿,衔接所述腔室入口平行设有两个导流斜齿,所述导流斜齿的后面再设有一个所述高齿,且连续设有四个所述迷宫涡流腔室和高齿组,构成所述一种汽轮机的涡旋汽封。2.根据权利要求1所述一种汽轮机的涡旋汽封,其特征在于,所述高齿设有高齿斜尖,所述高齿斜尖向所述汽端一侧斜折,与所述...
【专利技术属性】
技术研发人员:梁伟贤,
申请(专利权)人:智伟电力无锡有限公司,
类型:发明
国别省市:江苏,32
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。