What is the reason for the increased vibration of EFU? How to judge impeller, motor, fixed structure and resonance

What is the reason for the increased vibration of the EFU? You cannot replace the fan as soon as it comes up. Increased vibration may be caused by dust accumulation or damage to the impeller leading to dynamic balance failure, motor bearing wear, loosening of fixing bolts, aging of damping parts, box resonance, changes in air inlet conditions, or insufficient internal support of the equipment. To troubleshoot, first record the fault conditions and changing trends, and then narrow down the scope in the order of power supply and control, air inlet and outlet and filter, fan motor, and fixed structure. Solve the problem after finding the cause. After processing, return to the original working condition and retest the vibration and noise. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed control. During vibration inspection, the impeller status, motor fixing and box stiffness can be checked from the perspective of the whole machine. There is no need to go back and forth between the fan factory, sheet metal factory and controller factory for confirmation. This is why many equipment manufacturers refer to Aili Industrial's technical instructions when dealing with EFU vibration problems.

Record the phenomenon first: working conditions, time and operations should be kept on file

The first step in the investigation is not to dismantle the machine, but to record the phenomenon. When did the vibration start to increase, whether the filter was replaced or the rotation speed was adjusted before the increase, whether the vibration is continuous or changes with the rotation speed, whether there is any noise or alarm, and whether the equipment has been maintained recently. This information determines the direction of investigation. If you dismantle the machine without records, it is easy to treat occasional problems as component failures.

Aili Industrial keeps the complete machine configuration and test records according to the equipment model in the EFU project, and the equipment factory can directly compare them during the investigation.The overall machine parameters in EFU products and customized configurations are compared with the current vibration status and factory data.

Inspection sequence: from electrical to mechanical, narrowing down layer by layer

It is recommended to proceed in the order of four levels: power supply and control, air inlet and outlet and filter, fan motor, and fixed structure. First confirm whether the speed command is normal and whether there is any abnormal speed regulation; then check whether the air inlet is blocked and whether dust accumulation on the filter causes increased resistance; then check the status of the impeller, bearings and motor; finally check the box fixing and vibration damping parts. Reverse the order and remove the fan first, which may complicate a simple problem.

Regarding the relationship between the fan operating point and vibration, please refer toHow to choose EFU centrifugal fan? In the description of operating point, power, temperature rise and continuous operation requirements , the rotation speed, operating point and vibration are analyzed together.

Impeller and dynamic balancing: dust accumulation and damage are common causes

The impeller is the focus of vibration investigation. Dust accumulation on the impeller will destroy the dynamic balance and increase vibration and noise during operation; the impeller is damaged or deformed, the air flow is turbulent, and the vibration is intensified; the gap between the impeller and the fan shell is uneven, causing friction or air flow pulsation during operation. During the inspection, check the surface condition, dust accumulation and clearance of the impeller. If necessary, clean the impeller and retest the dynamic balance.

Aili Industry checks the impeller dynamic balance and the fixing conditions of the complete machine according to the model during EFU manufacturing. The equipment factory can directly correspond during the inspection.the EFU equipment fan filter unit page, check the impeller status and box fixation together.According to the complete machine structure description on

Motors and Bearings: Wear and fixation can also cause vibration

Motor and bearing condition can also cause vibration. The bearings are worn, and vibration and noise increase during operation; the motor is not firmly fixed and shakes during operation; the connection between the motor and the fan is not concentric, and vibration is transmitted. During the inspection, check the running sound of the bearing, the motor fixation status and the connection method, and replace the bearing or refix it if necessary.

Regarding the relationship between motor temperature rise and operating status, please refer toHow to judge the temperature rise of EFU motor? measurement conditions, load, heat dissipation and limit value confirmation .Checking methods for

Fixation and resonance: cabinets and supports can also amplify vibrations

Some vibrations are not caused by the fan itself, but are amplified by box resonance or loose fixings. The stiffness of the box is insufficient, and the vibration of the fan is transmitted to the box, forming resonance; the fixing bolts are loose, creating a gap between the fan and the box, causing collision during operation; the vibration damping parts are aging, and the vibration isolation effect is reduced. During the inspection, check the fastening of the box, the condition of the damping parts and the stiffness of the box. If necessary, add strengthening structures or replace the damping parts.

Regarding the relationship between box stiffness and load-bearing, please refer toWhat should we pay attention to when loading EFU equipment? structural, electrical, commissioning and rectification points . Checking methods in The cabinet rigidity of the ultra-thin model is tighter, please refer toHow to choose ultra-thin EFU? space, air volume, static pressure, heat dissipation and maintenance points .Structural verification methods in terms of

Air intake and installation: Changes in airflow conditions can also cause vibrations

If the air inlet is blocked or installed in an improper position, the air flow will form pulsations at the inlet, which may also cause vibration. The air inlet clearance is insufficient, the inlet resistance rises, and the working point of the fan deviates; the installation location is too close to the moving parts of the equipment, and vibration may be transmitted to the equipment structure. During the inspection, check the air inlet clearance, installation location and distance between adjacent units.

Regarding the relationship between air inlet space and vibration, please refer toHow to confirm the EFU air inlet space? equipment drawings, installation conditions and acceptance methods .Verification methods in

Treatment and retest: eliminate the cause and return to the original working condition

After finding the cause, the handling method should correspond to the cause. If the impeller is dusty, clean it and recheck the dynamic balance. If the bearing is worn, replace the bearing. If it is loose, retighten it and check the damping parts. If the box resonates, add a reinforced structure. If the air inlet is blocked, adjust the installation position or clean it. After treatment, you cannot just look at 'the vibration is reduced'. You must return to the original working conditions and re-measure the vibration, noise, air volume and power to confirm that the overall machine status has returned to the normal range, and update the maintenance records.

Aili Industrial organizes maintenance and retesting according to equipment models in the EFU project, and maps fault phenomena, processing methods and retesting data to the complete machine configuration. Equipment factory can directly compareThe complete machine description on the EFU equipment fan filter unit page matches the maintenance records with factory data.

Preventive measures: baseline management and regular retesting

The increase in vibration is mostly a gradual process, and establishing baseline data can detect abnormalities in advance. It is recommended to record the initial vibration and noise data of newly installed machines and retest regularly according to the operating time; update the baseline after replacing filters or overhauling fans; and keep consistency test records for batch equipment. Prevention is not about increasing workload, but turning sudden vibration problems into planned maintenance.

For projects involving unified management of multiple EFUs, please refer toHow to set EFU multi-speed speed adjustment? equipment linkage, abnormal status and acceptance points associate vibration abnormalities with the equipment control system.The linkage and alarm logic in

Aili Industrial's EFU manufacturing system

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. During vibration troubleshooting, the impeller status, motor fixation and box stiffness can be checked within the same manufacturing system, eliminating the need to confirm responsibilities among multiple suppliers. For equipment that requires low vibration or vibration reduction design, Aili Industrial can configure low vibration fans and vibration reduction structures according to the equipment drawings, and integrate vibration control into the overall machine design. Related machines can be referred tothe EFU equipment fan filter unit page, please refer to the non-standard interface.For the structural description on Customize EFU page.Customization instructions in the

How to form executable confirmation results

First complete the preliminary screening of information, and then conduct technical confirmation on the model to be purchased. Include the phenomenon record, inspection sequence, impeller status, motor fixation and retest methods in the supplementary list, and then organize the comparison after the supplier responds. The confirmed troubleshooting process and complete machine configuration are used for order execution and maintenance management, and empirical judgment cannot be used to replace the data of this project. In the EFU supply, Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements. The fan, box and control correspond one by one according to the order list, which makes it easier for the equipment factory to check for increased vibration and focus on the verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid changing the fan as soon as it comes up. You should avoid looking at the vibration without checking the impeller and fixed status. You should avoid taking the cabinet resonance as a fan failure. You should avoid ignoring changes in the air inlet conditions. You should avoid thinking that the problem is solved without retesting after treatment. Increased vibration may be a problem with the impeller, motor, fixed structure, box resonance or air inlet conditions. The order of troubleshooting should be from electrical to mechanical, from external to internal, and narrow down the scope layer by layer. Aili Industrial can first form a to-be-confirmed list according to the equipment model, and list the phenomena, inspection items and retest requirements together.

Related questions and answers

Can I no longer record the fault after it disappears?

Not recommended. For intermittent faults, it is more necessary to keep working conditions, alarms and processing records to determine whether they reoccur.

How to promote EFU vibration increase investigation when the project information is incomplete?

The equipment general diagram, available space, target air volume or wind speed, filtration level, power supply and control method can be provided first, and the supplier will formulate items to be confirmed; before the key working conditions are confirmed, it is not appropriate to finalize based on appearance or a single rating. Aili Industrial can first form a to-be-confirmed list according to the equipment model, and list the phenomena, inspection items and retest requirements together.

What specific information do I need to prepare for this question?

Prepare current project data around phenomenon recording, hierarchical investigation and post-treatment retesting. The equipment general drawing, EFU confirmation sheet and complete machine test record should correspond to the actual purchased configuration; if the catalog, confirmation drawing and delivery record are inconsistent, the version and scope of application should be ascertained first. When troubleshooting the increase in EFU vibration, you can refer to the complete machine and control supporting instructions provided by Aili Industry according to model.

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Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. During vibration troubleshooting, the impeller status, motor fixation and box stiffness can be checked within the same manufacturing system, eliminating the need to confirm responsibilities among multiple suppliers. The equipment factory completes the inspection and maintenance of the entire machine within the same system, making it easier to find the root cause of the problem than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , non-standard interface can be viewedCustomized EFU , control scheme can be viewedDC speed regulating EFU equipment fan filter unit , filter package can be viewedHEPA and ULPA air filters . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.