When the specifications and dimensions of the filter (i.e. the width and height of the installation frame) are locked, the core idea to increase its rated air volume is to maximize the effective filtering area of the internal filter paper without changing the external volume, and optimize the path of airflow to reduce resistance. It's like using clever interior design to make air flow more smoothly in a limited space of the same size. We can start from the following key technical dimensions:
1. Increasing the effective filtering area of filter paper: This is the most fundamental and effective method. The larger the filtering area, the more "channels" that can accommodate airflow, and the naturally larger the air volume.
Increase the number of filter paper folds: By optimizing the folding process, more layers of filter paper can be placed in the same space. This is equivalent to laying longer filtering paths in a limited space.
Reduce folding spacing: Reducing the distance between each folded filter paper can also increase the total unfolded area of the filter paper.
2. Optimize internal structure design: A good internal structure can make the airflow distribution more uniform, reduce local resistance, and thus improve overall throughput capacity.
Partition optimization: For filters with partitions, using aluminum foil partitions with smoother surfaces instead of traditional paper partitions can reduce airflow friction. At the same time, increasing the spacing between partitions appropriately can broaden the airflow channel, significantly reduce resistance, and thus increase air volume.
No partition design: Adopting a no partition or dense pleated design can eliminate the space occupied by partitions, accommodate more filter paper, and achieve higher rated air volume under the same volume. For example, with a size of approximately 610x610x292mm, the airflow of the non partition design (V-shaped pleated design) can reach 2200-2700 m ³/h, which is much higher than the traditional partition design of 1400-1860 m ³/h.
Streamlined frame: Changing the traditional right angle frame to a curved transition can reduce the vortices generated at the corners when the airflow enters, allowing the airflow to pass through the filter paper more smoothly, thereby increasing the effective air intake.
3. Upgrading filter materials and processes: The performance of the filter material itself directly determines how much air can pass through under the same conditions.
Using low resistance filter materials: Choose new and better breathable filter materials. For example, some high-efficiency filter materials can be designed with multiple layers of gradient density, which can ensure filtration efficiency while making it easier for airflow to pass through.
Improve sealing process: Use flexible sealing gaskets to avoid squeezing the edges of the filter paper due to tight sealing, resulting in a decrease in effective filtering area and an increase in local resistance.
4. Collaborative optimization at the system level: Sometimes, the problem lies not in the filter itself, but in the entire system.
Strengthening pre filtration: Adding more efficient pre filters (such as F8 level) at the front end to intercept most large particulate dust can greatly reduce the burden on high-efficiency filters, allowing them to operate at lower resistance for a long time and maintain a higher rated air volume.
Optimize system matching: Ensure that the selection of fans matches the total resistance of the system, avoiding the inability to reach the rated air volume of the filter due to insufficient fan power.
Key trade-off: Air volume and efficiency
In the pursuit of higher air volume, there is a crucial balance to be struck: increasing air volume usually reduces filtration efficiency. Research shows that as the wind speed (air volume) increases, the penetration rate of filter materials shows an upward trend, especially for particles between 0.1-0.3 μ m. This is because at common wind speeds, capturing small particles mainly relies on diffusion effects, and the higher the wind speed, the shorter the particle's residence time in the filter material, and the lower the chance of being captured.
summary
Therefore, increasing the rated air volume while maintaining fixed specifications is essentially a precise internal space optimization and material upgrade. The most effective combination strategy is to adopt a design without partitions or wide spacing to increase the filter paper area and reduce resistance, while using high-performance low resistance filter materials and optimized frame structures. But before implementation, it is necessary to evaluate whether this change will have an impact on key filtration efficiency indicators.
If you want to delve deeper into specific application scenarios such as purification levels, temperature and humidity requirements, I can provide you with further analysis.