What should I do if the EFU damping structure fails? Inspection sequence, cause determination and treatment methods

What to do if the EFU damping structure fails? You can't just add a damping pad and be done. If the vibration-absorbing structure is unqualified, it may be caused by incorrect selection of damping parts, offset installation position, incorrect fastening method, insufficient cabinet rigidity, poor dynamic balance of the fan itself, or equipment support conditions and vibration-absorbing design that do not match. Vibration reduction is a system problem, and vibration damping parts are only one part of it. To deal with unqualified vibration damping structures, first record the vibration phenomena and working conditions, and then investigate layer by layer in the order of damping parts status, installation method, box structure, fan status and equipment support. Deal with the cause after finding the cause. After handling, return to the original working conditions and retest the vibration and noise. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The vibration-damping structure, box stiffness and complete machine interfaces can be checked according to equipment drawings in the same manufacturing system. There is no need to go back and forth between the sheet metal factory, fan factory and complete machine factory for confirmation. This is why many equipment manufacturers will refer to the Aili Industrial structure description when dealing with EFU vibration-damping structure issues.

Record the phenomenon first: vibration, noise and working conditions should be kept on file

The first step in troubleshooting is not to add vibration damping pads, but to record the phenomenon. When did the vibration start, whether it is continuous or intermittent, what is the approximate frequency of the vibration, whether there is any noise or abnormal noise, whether the equipment has been maintained or modified recently, and whether the vibration affects the accuracy of the equipment. This information determines the direction of the investigation. Adding vibration damping parts without recording can easily suppress the problem temporarily instead of truly solving it.

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 vibration damping parts to fans, from box to supports

It is recommended to proceed in the order of the status of the vibration damping parts, installation method, box structure, fan status, and equipment support. First check whether the vibration damping parts are aging, falling off or incorrectly selected, then check the installation position and fastening method, then check the box stiffness and resonance, then check the dynamic balance and bearings of the fan itself, and finally check whether the equipment support conditions match the vibration damping design. Reverse the order and replace the fan first, which may complicate a simple problem.

Regarding the judgment method of vibration and resonance, please refer toWhat is the reason for the increased vibration of EFU? how to determine impeller, motor, fixed structure and resonance .Troubleshooting ideas on

Damper inspection: selection, aging and compression

If the damping structure is unqualified, check the damping parts themselves first. The selection of damping parts is incorrect, the frequency does not match, and the damping effect is poor; the damping parts age or fall off, and the vibration isolation fails; the compression amount of the damping parts is too large or too small, and the vibration damping performance decreases. During the inspection, check the model, material, quantity and status of the vibration damping parts to confirm whether they match the weight and vibration frequency of the fan.

Aili Industrial selects damping parts in the EFU structure according to the weight and vibration conditions of the fan. When inspecting the damping parts, the equipment manufacturer can directly refer to the structural description of the specific model and check the parameters of the damping parts together with the configuration of the whole machine.

Installation check: position, tightening and compression

There is nothing wrong with the vibration damper itself, but the installation method must also be checked. The installation position of the vibration damping parts is offset and the force is uneven; the fastening bolts are tightened too much, and the damping parts are crushed and the vibration isolation effect is lost; the contact between the vibration damping parts and the box or supporting surface is uneven, causing local stress. During the inspection, check the installation position, tightening status and contact surface flatness of the damping parts.

For the relationship between installation hole positions and fixation, please refer toHow to confirm the EFU mounting hole position? equipment drawings, tolerances, fixing methods and how to inspect sealing surfaces .Verification methods in

Cabinet Structural Check: Stiffness and Resonance

If the damping structure is unqualified, sometimes the problem is not the damping parts, but the box stiffness. The box board is thin and the reinforcement structure is insufficient. The vibration of the fan is transmitted to the box, forming resonance. The box and the equipment structure are rigidly connected, and the vibration is directly transmitted. The internal structure of the box is asymmetrical, and air flow pulsation causes vibration. During the inspection, check the box plate thickness, stiffeners and connection methods.

Regarding the relationship between box stiffness and load-bearing, please refer toHow to design the EFU box? strength, sealing, air inlet and outlet and maintenance points . Structural verification methods for For checking methods of equipment load-bearing, please refer toWhat should we pay attention to when loading EFU equipment? Structural, Electrical, Commissioning and Rectification Points .Instructions in

Fan status check: dynamic balance and bearings

If the vibration reduction structure is unqualified, the fan itself must be inspected. The fan impeller is dusty or damaged, the dynamic balance fails, and the vibration increases; the bearings are worn, and the operating vibration increases; the fan is not firmly fixed and shakes during operation. During the inspection, check the impeller status, bearing status and fan fixation, and confirm whether the vibration of the fan itself is within the allowable range.

Regarding the relationship between fan vibration and impeller status, please refer toWhat is the reason for the increased vibration of EFU? how to determine impeller, motor, fixed structure and resonance .Troubleshooting ideas on

Equipment support inspection: matching of support stiffness and vibration reduction

If the vibration-absorbing structure is unqualified, it also depends on the equipment support. The support stiffness of the equipment is insufficient and the vibration damping parts cannot function; the support surface is uneven and the vibration damping parts are unevenly stressed; the equipment support and vibration reduction design do not match, and the vibration is transmitted to other parts of the equipment through the supports. During the inspection, check the flatness of the support surface, the support stiffness, and the coordination between the damping parts and the support.

For the relationship between installation location and support conditions, please refer toHow to confirm the EFU installation location? equipment drawings, installation conditions and acceptance methods .Verification methods in

Treatment method: Corresponding rectification according to the cause

After finding the cause, the correction method should correspond to the cause. If the damping parts are selected incorrectly, replace them with matching models; if the damping parts are old, replace them; if the installation is off, adjust the position; if the tightening is too tight, adjust the amount of compression; if the box rigidity is insufficient, add a reinforced structure; if the fan itself vibrates too much, clean the impeller or replace the bearings; if the equipment support is insufficient, strengthen the support. After rectification, the vibration and noise must be re-measured at the same measurement point to confirm that it is back to the allowable range, and the installation record must be updated.

In the EFU project, Aili Industry organized vibration reduction rectification and retesting according to equipment models, and mapped the vibration reduction parts, box structure and support conditions to the complete machine configuration. Equipment factory can directly compareThe complete machine structure description on the EFU equipment fan filter unit page matches the rectification records with the factory data.

Aili Industrial's EFU vibration reduction package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The damping structure, box stiffness and complete machine interface can be checked according to equipment drawings within the same manufacturing system, and damping parts, box processing and complete machine assembly do not need to be transferred between multiple suppliers. For equipment with clear requirements for vibration reduction, Aili Industrial can configure the vibration reduction structure and low-vibration fans according to the confirmation diagram, and transfer the vibration reduction component selection, installation requirements and retest data to the complete machine data that can be verified. Related machines can be referred tothe EFU equipment fan filter unit page, please refer to the non-standard structure.The structure 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. Add the selection of damping parts, installation method, box stiffness, fan status and equipment support to the supplementary list. Comparison will be organized after the supplier responds. The confirmed vibration reduction structure, complete machine configuration and interfaces are used for order execution, 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 vibration damping parts, cabinets and fans correspond one by one according to the order list, which facilitates the equipment factory to deal with the unqualified vibration damping structure and settle it on the verifiable complete machine condition.

Misunderstandings to avoid

It should be avoided to just add damping pads without checking the cause, to avoid crushing the damping parts and losing the vibration isolation effect, to avoid treating the box resonance as a fan problem, to avoid ignoring the dynamic balance of the fan itself, to avoid ignoring the equipment support conditions, and to avoid thinking that the problem is solved without retesting after rectification. Unsatisfactory vibration damping structure may be a problem with the damping parts, installation, box, fan or support. The investigation should be narrowed down layer by layer from the damping parts to the fan, from the box to the support. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the vibration damping parts, structure and support conditions 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 reduction structure 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 drawings, listing the vibration damping parts, structure and support conditions together.

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

Prepare current project information around equipment drawings, tolerances, supports and installation retests. 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 dealing with unqualified EFU vibration reduction structures, you can refer to the structure and vibration reduction supporting instructions provided by Aili Industry by model.

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Key points for selection and acceptance inspection

Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The damping structure, box stiffness and complete machine interface can be checked according to equipment drawings within the same manufacturing system, and damping parts, box processing and complete machine assembly do not need to be transferred between multiple suppliers. The equipment factory completes vibration reduction rectification and complete machine matching within the same system, which is easier to maintain consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , non-standard structure 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.