Coquettish Rebirth

If you want to find someone to know about propellers and fans, of course you can't find researchers in the general industrial field!A large number of domestic state-owned enterprises are now closing down. This kind of technical strength is obviously not strong. As Jia Hongjian, a well-connected man, he has to find the Military Industry Research Institute to popularize science, right?After all, there are no manufacturers in the market that research cooling fans in the field of y chassis. If you want to find ordinary state-owned enterprises to research fans, you can only find electric fan manufacturers or industrial evaporator cooling manufacturers. But what kind of noise will they make? class test ah?

After all, the noise of the fan is that the faster the fan speed and the smaller the size, the louder the noise, but is the size of this industrial fan and electric fan comparable to the 12cm fan in the case?Can the speed be compared?Comparing this comprehensively, the cheap domestic 2000cm fan Jia Hongjian tried before, when the speed reaches 27 rpm, the sound is really touching!It immediately reminded Jia Hongjian of the legendary helicopter taking off!And what kind of turbo centrifugal graphics card cooling fan, after it is turned on at full speed, it really reminds people of the shock when the su[-] fighter jet took off, and thus thinks of their own motherland, and tears flowed down by patriotic sentiment...

To find a professional military research institute, Jia Hongjian had to ask Ye Jing, who had returned to the capital to visit his relatives, for help.After Ye Jing returned to China, she finally remembered that she hadn't seen her parents for a long time, so she went back to the capital.Now rely on her to ask her father where the fans of domestic airplanes are designed, or where the propellers of submarines are designed, and let him help to say hello.How good it is to take a look in the past!

After Ye Jing's matchmaking, Jia Hongjian soon got a piece of news-the current researcher on the ship in this country is the 712 Institute in Hubei Province.The 712 Institute is the only unit in China that researches electric transmissions. It is said that they researched the drive device on the buttocks of nuclear submarines!

Yo!With such a good opportunity to worship the powerful people, can Jia Hongjian let it go?So after Mr. Ye helped to say hello, Jia Hongjian flew directly to Wuhan City in Hubei Province on a special plane.After arriving in Wuhan City, he didn't have time to rest, so he took a taxi directly to the 712 office. [

These 712 schools are located near the beautiful Wuchang South Lake.After Jia Hongjian got there.After showing his letter of introduction, a gray-haired old man came out to pick him up. "Yo, you're Xiao Jia, right? Hello, my surname is Liang. I'm in charge of researching propeller blades in our institute. I heard from above. You want to develop cooling fans for computers, right? Then I can do it." Let's chat with you. Let's find a place outside? Inside, there are a bunch of big smokers in my office. It's very smoky. It's better to go outside. Let's walk by the lake and talk about it while walking?"

Hey!At that time, Jia Hongjian wondered whether Mr. Liang didn't want him to see something he shouldn't have seen, and then turned around and leaked the secret?We must know that in this institute, the most confidential information is not necessarily put on the table, but the problem is that Jia Hongjian is now an ordinary person, right?If this ordinary person does not have authority, he will not be able to know the things that many internal professionals know-for example, after entering, if there is a poster in the house that says 712 is a xxxx submarine The all-electric project of engineering research has been fully qualified after acceptance.This is not a problem for insiders, it is news in the system, but if Jia Hongjian, an outsider, sees it, then he may know immediately that 712 is researching Quandianjin.Then looking back, Jia Hongjian casually talked about it on the Internet, and then the Yankees collected this information. Isn't that providing information for free?You say to be a spy, at least we collect money, right?This is a free spy for someone, and the news was revealed, but we haven't received the money yet. Isn't this a loss?

This kind of thing seems to be very funny, but as far as Jia Hongjian knows, some confidential cases are so funny - just like a post he saw on the Internet in later generations, in this post, a Erhuo posted a picture of himself taken near the gun drug production line in a military factory.As soon as it was posted, many veterans who knew the secrecy regulations in the military industry advised him to delete it quickly. As a result, the bastard thought it was nothing, so he didn't delete it.Then what?Then the relevant parties noticed it, and the result was an investigation—it turned out that this guy's girlfriend was working in a military factory, but he couldn't stand the plea of ​​this bastard, so he secretly took a camera to take pictures in the factory, and brought them back to the factory. I looked at this product, but it turned out that I was not happy after seeing this product, so I wanted to post it to show off!As a result, I made myself unlucky and exposed my girlfriend's violation of the regulations. Then my girlfriend lost her job and went in because of violation of confidentiality regulations!

Similarly, the performances of various second-hand products on the Internet in later generations are really embarrassing. For example, once someone took a GPS and went to a military airport to measure the detailed coordinates, and then uploaded it to the Internet. Didn't Ma just enrich the map library for Americans?Turning around, someone flew over to bomb the airport, and it was accurate. Maybe it was because of the data uploaded by this guy!You know, the United States can use spy satellites to take photos, but the photos taken may not have completely correct coordinates!To be completely correct, people need to go to the field with equipment to collect it!That's why there are news from time to time in the newspapers that American tourists or Japanese tourists inexplicably ran to the vicinity of the military restricted area to collect coordinates and were arrested!

Of course, Jia Hongjian despised this kind of guy with flawed IQ, who couldn't sell himself for a price.His life is very precious, he will not let himself be sent to prison because he accidentally saw a secret that he should not have seen, his time is very valuable, okay?Besides, Jia Hongjian paid for the country's aircraft carrier. What kind of news did he really want to inquire about?

Here, he was taken by the old man to the lake for a walk. While walking, the old man asked, "Student Jia, tell me, what are the requirements for the fan you want, and what is the environment in which it needs to be used?" It’s kind of like that.” “Well, our fan requires four screw mounting positions that are 12 cm wide and 12 cm long, which is a square frame with a 12 cm diameter duct and a 12 cm diameter duct. The left and right fans. Is the application environment... the cooling of the computer case? Then the wind pressure needs to be higher, the air volume should not be too small, and there should be silence!" Jia Hongjian thought for a while, and tried to answer in a slightly technical way road.

"12 centimeters? Okay..." After hearing this, the old man lowered his head to consider the size, and then asked, "What about the application environment?" "Hmm? The heat dissipation of the computer case..." Jia Hongjian was a little confused The old man is old. Could it be that the old man has bad ears?As a result, who knows, the old man laughed, "Haha, I'm not talking about this environment, what I mean is, how much power is consumed by the entire product? How many watts? How much heat is generated? Only in this way can we determine the corresponding cooling fan design, yes Right? In this way, we can reduce the noise while ensuring the heat dissipation as much as possible, right?"

Whoa!This sounds very professional, right?Jia Hongjian was really convinced! "If the overall heat is generated, the maximum power consumption is about 200 watts... No, it is about 250 watts. What about the heat output? At the highest power consumption, the temperature should be around 70 degrees..." Jia Hongjian said, and by the way, put his pocket The photos inside were taken out.This photo of him is the photo of the hole flow chassis waiting for the fan at home.This photo shows the appearance of the chassis from the front, left, top, and back angles, and even the appearance of the interior after the chassis board is removed.

"For my case, I want to make a multi-air duct design, that is to say, on the one hand, the air enters from the front and the air exits from the rear; There is a horizontal air duct and a vertical air duct, the vertical air duct can take advantage of the rising characteristics of hot air, so that the heat of several pus can be dissipated as much as possible..." While showing the photo to the old man, Jia Hongjian said One side introduced.

"Well... Then, if the cooling fan with a general design is shrunk down, it's really not quiet..." the old man thought about it.That's right, the old man is studying propellers, can't you figure out this fan?Such a 12cm fan, looking at the photo, there are a total of 7 fans installed on the machine!These seven 7cm fans are not covered around, so how can there be noise of 12 or 50 decibels? If the noise is 60 or 50, isn't it the same as playing with a computer on the road?Isn't that noisy?

So the old man thought for a while and said, "Let's see, you might as well replace the two 12cm fans with a total height of 24cm and replace them with a large 20cm or 24cm diameter fan. When the speed is lower than that of a small fan, the speed of the blade tip will be faster, and the noise can be much smaller while sucking in the same amount of air. Similarly, I think your case itself is not small, so you can use less The fan should be used sparingly, it is better to use a big fan..."

Whoops!Interesting, isn't it!When Jia Hongjian heard this, he felt that he had learned a new knowledge!He hurriedly asked, "Grandpa Liang, is the relationship between the noise of this fan and its size and speed? The longer the blade of this fan, the better the performance and the quieter it is?"

"Hehe, that's not true. If you want to blow away as much air as possible, it should be similar to an electric fan, with short and wide blades, which are called bird-wing blades in our profession. Such The design only has a large air volume, but not enough air pressure... But your fan for heat dissipation should have as large an air volume as possible, so that more cold air can enter, and relatively more heat can be taken away..."( To be continued...)