Engineers who have just entered the industry must have encountered such crazy moments - the display screen is as hot as teppanyaki after half an hour of running. When they opened the box, they saw that the axial flow fan was installed in the sealed chamber and blowing hard towards the circuit board. Today, let’s talk about this seemingly simple but hidden mystery of installation knowledge, which will ensure that you can avoid detours for three years.

​​Position determines life and death​

Axial flow fan is not just about finding a space to stuff it in. Last year, a shopping mall frequently crashed in large screens. When the disassembly, it was found that the fan was installed directly above the power module, and the hot air was circulating and heating on the capacitor. Remember these three golden points:

1. ​​The air inlet is against the heat sink​​: It’s like applying an ice pack to a person with fever, so the cold air can hit the hot major
2. ​​The air outlet avoids structural parts​: The hot air discharge path cannot be blocked by cross beams, and it is best to be angled outward at a 45-degree angle.
3. ​Stay away from the signal line​: Electromagnetic interference can cause the fan speed to fluctuate by 15%. The most outstanding installation I have ever seen is to frame the fan on an aluminum alloy guide rail, which not only absorbs shock and isolates interference.

👉 Key points: Every time the internal temperature of the box drops by 1℃, the life of the LED lamp beads can be extended by 200 hours. Installing the fan in the right position is equivalent to buying a pension insurance for the display screen.

​Direction is more important than effort​

Don't laugh! There are really cases where someone installs a blower against it. The screen at a concert was smoking. When I opened it and found that the fan impeller turned inward, pumping external hot air into the box. Here is a shorthand mantra: "Eat the wind on the convex side, and exhale the wind on the concave side". The most intuitive thing to try with a lighter - ignite the flame and place it in the air inlet. When the flame is sucked in, it means the direction is correct.

​​Installation three methods​：

• The back of the hand is attached to the air outlet, and the heat flow is continuous
• Use A4 paper to get close to the air inlet, so the paper can be absorbed
• Listen to the sound to identify the position, and the normal operation is uniform and the noise means that it is wrong.

There is a cold knowledge: the layout of the dual fan should be installed diagonally to form an intersecting air duct. Just like two highways do not compete for each other, the heat dissipation efficiency can be improved by 40%.

​​The more quantity, the better​

The most outrageous case I have ever seen - a 1 square meter rental screen with 6 fans, and the noise was as high as 75 decibels, which was noisy than dehydration of the washing machine. Actually, there is a calculation formula:
​​Number of fans = screen power (W)/150​​
For example: 5-6 800W display screen is enough. But be careful not to buy miscellaneous fans at a cheap price. The counterfeit goods used by a certain engineering team have a nominal speed of 3,000 rpm, and the actual cooling effect is less than 2,000 rpm.

​Selection comparison table​

​Maintenance is more important than installation​

Last year, I helped the customer to inspect a stage screen that had not been cleaned for three years. The air inlet of the fan was so dusty that only the thickness of chopsticks remained. It is recommended to do in-depth maintenance every quarter:

1. Remove the protective net and clean it with ultrasonic wave
2. Add high temperature resistant grease to bearings
3. Use a brush to clean the ash accumulation of fan blades
4. Test speed attenuation rate (if you exceed 15%, you have to replace it with new ones)

There is a trick: apply dustproof cotton at the air inlet, and replace it once a month to save trouble than quarterly cleaning. But be careful not to use too dense filters. A certain KTV screen will have insufficient air inlet due to excessive dense filters, and the fan will be exhausted.

​​Self-question time​

Q: What should I do if the space is narrow and I can’t install the fan?
A: Try the turbocharger solution - open a honeycomb hole on the side of the box and form negative pressure heat dissipation with a centrifugal fan. This is how the curved screen of a certain automobile 4S store is done, and the heat dissipation efficiency is actually increased by 20%.

Q: How to prevent rust in humid environments?
A: Three tricks: choose anodization for the fan shell, use 316 stainless steel for screws, and apply waterproof glue for connectors. The experience of the beach project is to spray WD-40 once a month, which is more effective than any anti-rust paint.

Q: How to reduce noise?
A: Rubber shock absorber pad + silence cotton are used in both directions. A theater project also added a maze-type sound insulation structure to the air duct, which successfully pressed the noise from 60 decibels to 45 decibels, comparable to the library's silent level.

​Personal opinion​
Installing an axial flow fan is like fitting glasses to the display screen - the degree is clear and bright, and the wrong one is dizzy. You might as well spend half an hour to figure out the direction of the air duct before installing the next time, and this time will be absolutely worth it. Remember, good heat dissipation does not depend on stacking hardware, but on allowing every wisp of wind to walk on the right path.

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