How to deal with uneven EFU wind speed? Shutdown judgment, fault records and maintenance methods

How to deal with uneven EFU wind speed? You cannot stop and dismantle the machine as soon as the wind speed deviation is discovered. Uneven wind speed may be caused by unreasonable measurement point plan, inconsistent measurement conditions, partial obstruction of the air outlet surface, uneven filter installation, changes in air inlet conditions, or deviation of the fan working point. Some situations require immediate shutdown and processing, while others can record observations and arrange planned maintenance. To deal with uneven wind speed, you must first determine whether it is necessary to shut down, then record the fault conditions and changing trends, check in the order of measuring points, structures, filters and fans, find the cause and deal with it, and retest according to the same plan after treatment. Ai Li Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed control. When troubleshooting uneven wind speed, the air outlet structure, filter status and fan working point can be checked from the perspective of the whole machine. There is no need to go back and forth between the fan factory, filter factory and the whole machine factory for confirmation. This is why many equipment manufacturers will refer to Ai Li Industrial's technical instructions when dealing with the problem of uneven EFU wind speed.

Shutdown judgment: first determine whether immediate processing is required

If you find that the wind speed is uneven, first determine whether you need to shut down immediately. When the wind speed deviation has affected the protection area coverage, equipment yield or safety, the machine should be shut down immediately for processing; when the wind speed deviation is within the allowable range, only slightly lower in some places, and does not affect the operation of the equipment, you can record observations and arrange planned maintenance. The judgment is based on the actual needs of the protected area and the operating status of the equipment, rather than just looking at the deviation figures.

Ai Li industrialEFU products and customized configurations list the complete machine structure and supporting instructions by model. The equipment manufacturer can directly correspond to the specific model when judging shutdown, and put the protection area requirements and wind speed data in the same table.

Fault records: Working conditions, measuring points and operations must be kept on file

After determining the treatment method, record the fault conditions. When the uneven wind speed was discovered, whether the measuring point layout and measurement conditions are consistent with the last time, where the deviation occurs, whether the filter has been replaced or the rotation speed has been adjusted recently, and whether the equipment operating status has changed. This information determines the direction of the investigation. If the machine is disassembled without records, it is easy to mistake the measurement error as a structural failure.

For methods of wind speed measurement point layout and uniformity evaluation, please refer toHow to evaluate EFU wind speed uniformity? Measuring point plan, average value, deviation and acceptance method .

Inspection sequence: from measuring point to structure, from filter to fan

It is recommended to proceed in the order of measurement point plan, measurement working conditions, air outlet structure, filter status, air inlet conditions, and fan working point. First confirm whether the measuring point plan and measuring working conditions are consistent with the last time, then check whether there is any change in the structure of the air outlet surface, then check the filter installation and sealing, then check the air inlet conditions, and finally confirm the fan working point. Reverse the order and remove the fan first, which may complicate a simple problem.

Regarding the relationship between the air outlet structure and airflow organization, please refer toHow to design the EFU box? strength, sealing, air inlet and outlet and maintenance points .Structural verification methods for

Structural and filter inspection: partial obstruction and uneven installation

The common reason for uneven wind speed is that the air outlet surface is partially blocked or the filter is unevenly installed. There are structures, cables or foreign objects near the air outlet surface, and the local wind speed is low; the filter installation is skewed or unevenly pressed, and the local wind speed is different; the filter frame is deformed, and the local airflow is blocked. During the inspection, check the vicinity of the air outlet surface and the installation status of the filter to confirm that the entire air outlet surface is not partially blocked.

Regarding the relationship between sealing structure and complete machine sealing, please refer toHow to confirm EFU installation seal? equipment drawings, installation conditions and acceptance methods .Verification methods in

Air inlet and fan inspection: inlet conditions and operating points

Changes in air inlet conditions and working points will also cause uneven distribution of wind speed. The air inlet is partially blocked and the inlet wind speed is uneven; the air inlet is close to the process exhaust and the inlet airflow is turbulent; the fan speed or operating point changes, and the wind speed at the edge of the air outlet surface is attenuated. During the investigation, it is necessary to check the air inlet clearance, air inlet source and fan working point, and judge the inlet conditions and air outlet distribution together.

Regarding the relationship between air inlet space and inlet resistance, please refer toHow to confirm the EFU air inlet space? equipment drawings, installation conditions and acceptance methods . Verification methods in For the analysis method of fan operating point, please refer toHow to choose EFU centrifugal fan? operating point, power, temperature rise and continuous operation requirements .Description of

Maintenance method: handle accordingly according to the cause

After the cause is found, the maintenance method should correspond to the cause. If the measuring point plan is unreasonable, rearrange it according to the grid; if the measurement conditions are inconsistent, unify the filter status and speed; if the air outlet surface is blocked, clean the block or adjust the structure; if the filter is unevenly installed, reinstall it and check the compression; if the air inlet conditions are uneven, adjust the installation position or clean the clearance; if the fan working point is wrong, adjust the speed. After processing, re-measure the wind speed distribution according to the same measuring point plan to confirm that the average value and deviation return to the allowable range.

In the EFU project, Aili Industries organized wind speed maintenance and retesting according to equipment models, and mapped the measuring point plan, structural conditions and fan operating points 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

Most of the uneven wind speed is a gradual process, and establishing baseline data can detect abnormalities in advance. It is recommended to record the initial wind speed distribution of newly installed equipment and retest regularly according to the operating time; update the baseline after replacing the filter or adjusting the rotation speed; and keep consistency test records for batch equipment. Prevention is not about increasing the workload, but turning sudden wind speed 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 wind speed abnormalities with the equipment control system.The linkage and alarm logic in

Aili Industrial's EFU wind speed package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. When investigating uneven wind speed, the air outlet structure, filter status and fan operating point can be checked within the same manufacturing system, eliminating the need to confirm responsibilities among multiple suppliers. For equipment with requirements for wind speed uniformity, Aili Industries can configure the diversion structure, flow equalization design and wind speed monitoring according to the confirmation diagram, and put the measuring point plan, judgment standards and complete machine data into verifiable complete machine data. 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 shutdown judgment, fault records, inspection sequence, maintenance methods and preventive measures in the supplementary list, and organize comparison after the supplier responds. The confirmed measuring point plan, complete machine configuration and interface are used for order execution, and sample parameters 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, filter, box and control correspond to each item in the order list, which facilitates the equipment factory to deal with the uneven wind speed and settle the condition of the complete machine that can be verified.

Misunderstandings to avoid

It should be avoided to stop and dismantle the machine as soon as the wind speed deviation is discovered. It should be avoided to only look at the deviation number without looking at the impact of the protection area. It should be avoided to judge the structural failure if the measurement working conditions are not uniform. It should be avoided to only clear the wind surface blockage without checking the filter installation. It should be avoided to think that the problem is solved without retesting after treatment. Uneven wind speed may be a problem with the measuring point, working conditions, structure, filter, air inlet or fan. The treatment should be narrowed down layer by layer from the measuring point to the structure, and from the filter to the fan. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, and list the shutdown judgment, inspection items and maintenance 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 the investigation of EFU wind speed unevenness when the project information is incomplete?

The general diagram of the equipment, available space, target air volume or 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, and list the shutdown judgment, inspection items and maintenance conditions 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 dealing with uneven EFU wind speed, you can refer to the complete machine and structure supporting instructions provided by Aili Industry according to 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. When investigating uneven wind speed, the air outlet structure, filter status and fan operating point can be checked within the same manufacturing system, eliminating the need to confirm responsibilities among multiple suppliers. The equipment factory completes wind speed maintenance 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 , filtering packages can be viewedHEPA and ULPA air filters , the overall 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 . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.