问题 问答题

试述Sh型离心泵拆卸的一般程序

答案

参考答案:

(1)管路拆卸:

1)检查水泵检修的安全措施已齐全,关闭进出口阀门

2)拆下有关表计,分解与系统有连接的管路,分解后各管头应用白布包上或用木塞堵住,防止杂物落入

(2)联轴器分解:

1)拆除联轴器的保护罩

2)测量对轮的轴向间隙和径向间隙,测出旋转体的轴向窜动量

3)拆下联轴器的销钉,使水泵与电动机分离

(3)拆吊泵盖:

1)拆下固定在泵盖与泵体上的整体零件,如填料压盖等

2)拧下泵盖法兰连接螺栓的螺母,取出定位销钉,用顶丝将泵盖与泵体顶离,然后吊起泵盖并放在附近的方木上,起吊时应保持泵盖的水平并防止窜动,以防止蹩坏密封环和撞伤叶轮

(4)轴承拆卸:

拆卸轴承盖或端盖、上盖等,取出上轴瓦,把油环拨向下轴瓦的两边,保证吊起转动部分不致于把下轴瓦带出

(5)叶轮的检测:

1)检查叶轮与泵轴的配合是否松动

2)测量叶轮的晃度

3)测量密封环的径向间隙和轴向间隙

(6)转动部分起吊:

用钢丝绳穿在转动部分的两端,吊出后放在木方或支架上,注意应使泵轴的所有零件均悬空,以便进一步拆卸

阅读理解

阅读理解

     The International Space Station allows astronauts to live in space for extended amounts of time,

enabling them to explore the outside universe and conduct many experiments. However, nothing like that

exists for our oceans, and thanks to the high water pressure, ocean researchers are able to explore what

lies undersea for very short periods of time.

     They are therefore never able to fully explore the deep inside areas of our oceans. However, if French architect Jacques Rougerie has his way, that will change soon. 

     Jacqucs has designed a ship that will allow researchers to spend a long period of time observing the sea life and conducting experiments. The huge 167ft ship, named 'Sea Orbiter', consists of two areas-one

above the water where the scientists and crew will live, and a lower pressurized deck (甲板), where

scientists will be able to spend as much time as they wish. Since it is powered by sea currents and wind, he expects it to drift (漂流) along the oceans slowly, taking about two years to circumvent the globe.

     Jacques will make their life as comfortable as possible in the ship. Besides being equipped with the

latest sailing tools and communication equipment, the ship will also have a gym, a television and a DVD

player. And these guys will not be eating freeze-dried food like astronauts. Instead, Jacques, an

accomplished chef, plans on cooking them delicious meals every day.

     The biggest problem to this giant ship is the cost, which is expected to be over $500 million-per ship!

However, Jacques, who strongly believes that the secrets of our oceans may be the key to solving global

warming and a vital supply for food and medicine in the future, is confident he will be able to convince

governments all over the world to help out, and expects to start construction on not one, but four or five of these amazing ships soon!

1. Why can't ocean researchers explore the deep oceans for a long time?      

A. Because they can't stand the high water pressure.                        

B. Because it's too cold in deep ocean.                                      

C. Because time for experiments is too limited.                              

D. Because it's dangerous to observe the sea life.                          

2. The underlined word "circumvent" probably means_____.              

A. fly away                                                                  

B. get around                                                                

C. travel through                                                            

D. move into                                                                  

3. From the fourth paragraph we can learn that_____.                     

A. Jacques intends to design the ship mainly for sightseeing and traveling    

B. living a comfortable life helps to do the ocean research quickly          

C. it's much more expensive to eat freeze-dried food                        

D. researchers on Jacque's ship will live more comfortably than astronauts  

4. Which of the following would be the best title for the text?              

A. Sea Orbiterthe ship of the future                                        

B. A new way to explore the deep oceans                                      

C. A great architectJacques Rougerie                                        

D. Travel around the globe in Sea Orbiter                                    

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