What is the reason for the loud noise when EFU is running? How to reduce EFU noise?
After the EFU is installed inside the device, it needs to run for a long time.
So, in addition to:
Air volume
wind speed
cleanliness
outside,
Noise and vibration
It is also an issue that equipment manufacturers are more concerned about.
Especially in experimental equipment, electronic equipment, semiconductor equipment, and other scenarios that require high equipment operating environment, excessive EFU noise may affect the overall equipment operating experience.
So:
Why does EFU produce noise?
Is the loud noise from the EFU a problem with the fan?
How to reduce EFU operating noise?
In reality, EFU noise is usually not determined by a single component.
3. Where does EFU noise mainly come from?
When an EFU is running, noise may come from:
Motor
fan
airflow
filter
Box structure
as well as:
Installation method
wait.
It can be simply understood as:
motor ↓ fan rotation ↓ generates air flow ↓ air passes through filter ↓ structure generates vibration ↓ ultimately forms the overall noise of the EFU
Therefore, if you want to reduce noise, you need to analyze the entire system.
4. Why does the EFU fan produce noise?
The fan is one of the main power components of the EFU.
When the fan rotates at high speed, it will produce:
mechanical noise
as well as:
Aerodynamic noise.
If the fan working point is inappropriate or the air flow channel design is unreasonable, additional noise may also be generated.
therefore:
Fan noise cannot be solved only by reducing the speed.
The design of the fan itself and the airflow structure also need to be considered.
5. Does the EFU motor also produce noise?
meeting.
The following may occur during motor operation:
electromagnetic noise
mechanical noise
as well as:
vibration.
If the matching between the motor and the fan is unreasonable, it may also affect the operating status of the entire machine.
Therefore, EFU design needs to consider both:
Motor
and:
fan
match between.
6. Why does the greater the EFU air volume, the higher the noise?
Normally, after the fan speed is increased:
Increased air volume
at the same time:
aerodynamic noise
It may also increase.
Therefore, we cannot simply pursue:
Greater air volume.
Instead, reasonable ones should be determined based on the actual needs of the equipment:
Air volume
and:
Wind speed.
If the equipment only requires a certain amount of air supply, there is no need to let the EFU run at an excessively high air volume for a long time.
7. Will the filter affect EFU noise?
It will have a certain impact.
The filter itself produces:
air resistance.
If the filter resistance increases, the working status of the fan may change.
For example:
Filter resistance increases
↓
Increased system resistance
↓
Fan operating point changes
↓
The operating status changes
Therefore, the filter is also a factor that needs to be considered in the overall operating status of the EFU.
8. Will the clogged filter cause the EFU sound to become louder?
It is possible, but it cannot be directly considered:
Louder noise = clogged filter.
Changes in filter status may cause changes in system resistance, thereby affecting the fan operating point.
But EFU noise changes may also be related to:
fan
Motor
control system
structural vibration
as well as:
Installation method
related.
Therefore, comprehensive judgment is required.
9. What is the relationship between EFU vibration and noise?
There is usually a certain relationship between the two.
If the motor or fan produces significant mechanical vibration during operation:
vibration
↓
pass to box
↓
The box resonates
↓
increased noise
Especially when the internal installation space of the equipment is relatively compact, the connection method between structures may also affect vibration transmission.
10. Will the EFU box structure affect noise?
meeting.
If the sheet metal structure:
Insufficient stiffness
or:
Unreasonable structural design
Vibrations may occur when the fan is operating.
Therefore, EFU noise reduction not only requires attention:
Motors and fans
Also need attention:
Box structure.
Reasonable structural design can reduce unnecessary vibration transmission.
11. Will the EFU installation method affect the noise?
meeting.
For example, the EFU is not installed securely:
Equipment vibration
↓
EFU structural vibration
↓
Noise transmitted to equipment
In this case, even if the EFU itself is operating normally, the overall noise of the equipment may increase.
So you need to confirm when installing:
Fixed method
Installation flatness
as well as:
connection structure
12. How to reduce EFU noise?
You can start from several aspects.
1. Reasonable selection of fans
According to actual situation:
Air volume
wind pressure
Speed
Choose the right fan.
2. Match the appropriate motor
The motor needs to match the fan operating point.
Avoid:
Too much power
or:
The work point is unreasonable
situation.
3. Optimize air flow channels
Minimize unnecessary:
airflow impact
turbulent flow
as well as:
local resistance.
4. Optimize the box structure
Improve the necessary parts:
structural stiffness
Reduce vibration transmission.
5. Reasonably control the running speed
If the equipment does not require higher air volume, the EFU operating status can be controlled through speed adjustment.
6. Optimize the installation method
Ensure EFU:
Fixed and reliable
And reduce unnecessary vibration transmission.
13. Why can’t the low-noise EFU just replace a fan?
This is a relatively common misunderstanding.
if:
The fan has been replaced
but:
Motor does not match
or:
Improper air flow channel
Or:
The box is prone to vibration
Eventually the noise may still be noticeable.
So the low noise EFU should start from:
Fan + motor + air flow + structure + control
Comprehensive design from several aspects.
14. Is it more difficult to control noise with ultra-thin EFU?
Ultra-thin EFUs have more limited internal space.
For example, in a structure with a height of about 70mm, it is necessary to arrange:
Motor
fan
filter
as well as:
Air flow channel.
After space compression, for:
Fan structure
airflow path
Motor size
as well as:
Cabinet design
Put forward higher matching requirements.
Therefore, ultra-thin EFU needs to be in:
thickness
Air volume
wind pressure
noise
comprehensive balance between them.
15. Why do semiconductor equipment pay more attention to EFU noise?
Semiconductor equipment usually has complex internal structures, and the EFU needs to be installed within the limited space of the equipment.
In addition to clean air supply, you may also be concerned about:
vibration
noise
as well as:
Wind speed stability.
Therefore, the EFU design needs to be matched according to the actual requirements of the equipment, rather than simply pursuing greater air volume.
16. Do electronic equipment such as placement machines need low-noise EFU?
Some electronic equipment requires EFU to run for a long time.
If the equipment is sensitive to operating noise and vibration, it needs to be considered during the EFU design stage:
fan
Motor
structure
as well as:
Installation method
and other factors.
Specific requirements need to be determined based on the actual situation of the equipment.
17. How does Aili Industrial implement EFU low-noise design?
Aili Industrial's EFU does not just perform final machine assembly.
Production system covers:
Motor
fan
filter
Automatic control system software and hardware
sheet metal
as well as:
Complete machine assembly.
Therefore, when designing the EFU, matching can be started from the core components.
For example:
Motor
↓
fan
↓
filter
↓
airflow structure
↓
Sheet metal structure
↓
control system
Consider together.
18. Why does Aili Industries produce its own fans and motors?
Because the motor and fan are important components of the EFU operating status.
If the core components come from completely different suppliers, product design may need to be done in:
size
performance
control
multiple matches between them.
Aili Industrial has the production capacity of motors and fans, and can carry out simultaneous design according to EFU product requirements.
for:
Ultra-thin EFU
Special air volume
Special wind speed
as well as:
Special installation space
project, this method is more convenient for overall matching.
19. Does the EFU low-noise design mean that the air volume will definitely decrease?
uncertain.
Low-noise design does not mean simply reducing air volume.
A more reasonable idea is:
On the premise of meeting the target air volume and pressure of the equipment, match the fan, motor, airflow structure and operating speed.
Ultimately it needs to be:
Air volume
wind speed
noise
Energy consumption
Find the suitable working point for the equipment.
20. What should we pay attention to when conducting EFU noise testing?
You can focus on:
Machine noise
Fan operating status
Motor running status
vibration
Air volume
as well as:
Running speed
and other parameters.
When testing, you also need to clarify:
Test distance
test environment
as well as:
Operating conditions
Otherwise it is not easy to directly compare different test results.
21. What should I do if the EFU noise suddenly becomes louder?
If the original operation was normal, but then the noise increased significantly, you can check in the following order:
first step
Check whether the fan is running abnormally.
Step 2
Check the motor for abnormal vibration.
Step 3
Check if the filter resistance changes significantly.
Step 4
Check whether the box and installation structure are loose.
Step 5
Check whether the control system operating speed changes.
Step 6
Verify that there are no airflow obstructions inside the device.
By investigating item by item, it is easier to find the cause of the noise change.
22. How to choose a low-noise EFU manufacturer?
Don't just ask:
'How many decibels is your EFU?'
It is more recommended to ask:
What is the structure of the fan?
What type of motor is it?
Do the fan and motor match?
Is there any complete machine testing?
How to deal with vibration?
Is there any customization for the device?
What are the noise test conditions?
This information is more valuable than looking at a noise number alone.
23. Aili Industrial EFU Noise Control Plan
Aili Industries from:
Motor
fan
filter
sheet metal
control system
arrive:
Whole machine assembly
A complete production system has been established.
Therefore, in the EFU project, according to the actual needs of customers, we can:
Fan working point
Motor matching
airflow structure
Box structure
as well as:
Control method
Carry out comprehensive design.
For applications such as semiconductor equipment, electronic equipment, and placement machines that have requirements for the equipment operating environment, the EFU solution can be matched based on actual installation conditions and technical requirements.
24. Frequently Asked Questions
Why is the EFU noisy?
It may be related to the fan, motor, air flow, filter resistance, box structure, vibration and installation method, and needs to be judged based on the actual operating status.
Will the greater the air volume of the EFU, the greater the noise?
There is usually a certain relationship between air volume and noise, but the specific situation is also related to factors such as fan structure, speed, and air flow design.
Do EFU filters affect noise?
Changes in filter resistance will affect the fan operating point, which may affect the operating status.
Will EFU motors and fans produce vibration?
Mechanical vibration may occur during operation of motors and fans, and vibration transmission needs to be controlled through component matching, structural design, and installation methods.
How does ultra-thin EFU reduce noise?
It is necessary to comprehensively consider the motor, fan, filter, air flow channel, box structure and operating speed, rather than reducing the performance of a single component alone.
Can EFU reduce noise through speed regulation?
If the equipment allows it, appropriately adjusting the operating speed can change the operating status of the fan, but it needs to meet the required air volume and wind speed of the equipment at the same time.
Can Aili Industrial customize low-noise EFU?
The solution can be matched based on the actual air volume, wind pressure, installation space, operating speed and noise requirements of the equipment.
