问题 问答题 简答题

活塞空压机排气温度过高是何原因,如何处理?

答案

参考答案:

原因:

⑴一级吸气温度高。

⑵中间冷却器效率低,二级进气温度高。

⑶气阀门有漏气现象,排出的高温气体漏进气缸,再压缩原排气温度就高。

⑷在装配气阀组件时,没将气缸体上阀口处残留硬化的旧石棉填料清除干净,而在重新装配气阀组件时,使不能与气缸上的阀制口严密配合,留有小缝隙,致使高压气体串回气缸而引起排气温度过高。

⑸活塞环磨损或质量不好,吸排气互相串气。⑹气缸水套及冷却水管上有沉淀物和浮沫层,影响冷却效果。

处理:

⑴降低一级吸气温度。

⑵检修中间冷却器,使冷却器超到冷却作用。

⑶检修研磨气阀阀座与阀片,使之接触严密或平抑新的阀片、阀座、防止串气。

⑷将气缸上阀口处原残留石棉填料清除干净,在装配气缸组件充填石棉绳等填料时,也要垫平,防止阀组件倾斜而产生漏气。

⑸或更换活塞环。

⑹清洗气缸水泵及冷却管上的污物。

多项选择题
阅读理解

Top lists are lecturing people on everything from “100 books to read”. Aren’t you just tired of being told what to do with your time?

Now you have a list to end all lists!

Take a look at the following two examples from the list of “101 things not to do”:

Swim with Dolphins(海豚)?

Swimming with dolphins is one of the world’s most profitable tourist activities. However, every dolphin will welcome having their busy, tiring day interrupted by tourists screaming pushing around them in the water. Worse yet, when dolphins get too near to the boats loaded tourists, they could get caught up in ropes and killed by propellers(螺旋桨).

Here’s a little secret. Dolphins look like smiling at you, but actually they’re just opening mouths.

Go to See the Mona Lisa?

There must be something about the mysterious(神秘的) smile. The 6 million people who the lady in the Louvre every year can’t all be wrong after all. But they can be quite annoying standing in front of you, holding up their cameras to prevent you from seeing anything. In fact it is hard for you to see the painting clearly because you have to stay away from it for security read. After queuing for hours, many tourists can remain in front of the painting only for 15 seconds most.

If the mysterious lady in the picture knew her fate, she wouldn’t just be smiling, she laughing.

So, still long to see the Mona Lisa? If you want to find out more about the list, read 101 Things NOT to Do Before You Die. Visit www.not2dobeforeidie.co.uk and buy the book at a 20% discount.

小题1:According to the passage, swimming with dolphins              .

A.is the world’s most popular tourist activity

B.gives fun to both tourists and dolphins

C.will make tourists busy and tired

D.can cause danger to dolphins小题2:What does the author think about going to see the Mona Lisa?

A.It is wrong to go and see the mysterious smile.

B.It is not as satisfying as expected.

C.Fifteen seconds in front of the painting is enough.

D.Queuing for hours is worthwhile.小题3:The list of “101 things not to do” is made most probably because its author              .

A.thinks it boring to do the things suggested by other lists

B.believes other lists are not humorous enough

C.intends to persuade people to read more lists

D.wants to provide a list different from other lists小题4:What is the main purpose of the passage?

A.To advertise a book

B.To introduce a website

C.To comment on popular lists

D.To recommend tourist activities