问题 问答题 简答题

汽轮机推力轴承的工作过程是怎样的?

答案

参考答案:

安装在主轴上的推力盘两侧工作面和非工作面各有若干块推力瓦块,瓦块背面有一销钉孔,靠此孔将瓦块安置在安装环的销钉上,瓦块可以围绕销钉略为转动。

瓦块上的销钉孔设在偏离中心7.54mm处,因此瓦块的工作面和推力盘之间就构成了楔形间隙。当推力盘转动时油在楔形间隙中受到挤压,压力提高,因而这层油膜具有承受转子轴向推力的能力,安装环安置在球面座上,油经过节流孔送入推力轴承进油室,分为两路经推力轴承球面座上的进油孔进入主轴周围的环形油室,并在瓦块之间径向流过。在瓦块与瓦块之间留有宽敞的空间,便于油在瓦块中循环。

推力轴承球面座上装有回油挡油环,油环围在推力盘外圆形成环形油室。在工作面和非工作面回油挡环的顶部各设两个回油孔,而且还可以用针形阀来调节回油量。

在推力瓦快安装环与推力盘之间也装有挡油环,该挡油环包围住推力瓦快,形成推力轴承的环形进油室。

完形填空
Once upon a time there lived an old man in a nice cottage with a large garden. The old man was seen   41  his flowers all the time. They were so well-tended that every passer-by could not but   42  for a glance.
One day a young man went by the garden. He gazed at the splendid garden, lost in admiration at the beauty of the scenery. Then, suddenly he   43  the old gardener was blind.   44  , the young man asked, “Why are you busy tending these flowers every day which you can’t  45  in fact?” The old man smiled and answered that “ I can tell you 46  reasons. First I was a   47  when I was young, and I really like this job. Second, although I can’t see these flowers, yet I can  48 them. Third,I can smell sweetness of them. As to the last one, that’s   49 .
“Me? But you don’t know me,” responded the young man   50  .
“Yeah, it’s   51  that I don’t know you. But I know everyone knows flowers and would never turn them down. I know the beauty of my garden will get many people into a good mood(心情). In the meantime, it also   52  a chance to me to have a word with you here and to enjoy the happiness these flowers have brought us.”
The old man’s  53  astonished me. The blind man grows flowers and serves them as a link of minds so as to make everybody enjoy the sunshine in spring. Isn’t it one kind of happiness?
I believe every flower has   54  with which they can see the kindness of the man’s heart. The blind man grows flowers in his heart. Though   55 to see the beauty of blossoming, he surely can hear the voice of it, I suppose.
小题1:
A.lovingB.wateringC.tendingD.planting
小题2:
A.stopB.stayC.liveD.run
小题3:
A.realizedB.noticedC.feltD.thought
小题4:
A.ExcitedB.FrightenedC.ShockedD.Satisfied
小题5:
A.feelB.seeC.hearD.eat
小题6:
A.oneB.twoC.threeD.four
小题7:
A.gardenerB.teacherC.farmerD.painter
小题8:
A.tasteB.plantC.touchD.appreciate
小题9:
A.itB.meC.themD.you
小题10:
A.with pleasureB.in surpriseC.with hopeD.in anger
小题11:
A.trueB.possibleC.a pityD.a shame
小题12:
A.introducesB.offersC.standsD.leaves
小题13:
A.wordsB.behaviorC.storyD.attitudes
小题14:
A.earsB.soulC.eyesD.heart
小题15:
A.refusingB.tryingC.pretendingD.failing
单项选择题