Bag Air Filters Used For Intermediate Filtration In Air Conditioning Systems

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The bag air filter is a filtration device with novel structure, easy operation, high efficiency, and strong applicability, featuring a diverse range of types and extensive functions. Below is a detailed elaboration on the types and functions of bag air filters:

I. Types

Based on different classification criteria, bag air filters can be categorized into several types, primarily including:

Classified by Filtration Efficiency:

• Preliminary Filter: Primarily used to filter large particles, serving as the first line of defense in the air filtration system, capturing dust particles larger than 5μm.
• Medium Efficiency Filter (Grades F5, F6, F7, F8, F9): With filtration efficiency between that of preliminary and high-efficiency filters, they are designed to further remove medium-sized particles (**5μm) from the air, commonly used in intermediate filtration in air conditioning systems or as a prefilter for high-efficiency air filters.
• High-Efficiency Filter: Capable of filtering out tiny particles with diameters of 0.3 microns or less, including dust, bacteria, viruses, etc., exhibiting extremely high filtration efficiency and commonly used in settings with stringent air quality requirements.

Classified by Structural Form:

• Single-Bag Filter: Composed of a single filter bag, suitable for applications with low flow rates or specific spaces.
• Multi-Bag Filter: Assembled from multiple filter bags, suitable for high flow rates or high-demand filtration scenarios, significantly increasing filtration area and efficiency.
• Swing-Arm Bag Filter: Facilitates quick filter bag replacement through a swing-arm mechanism, easy to operate, and suitable for situations requiring frequent bag replacements.
• High-Precision Bag Filter: Employs high-precision filter bags, offering even higher filtration accuracy, suitable for scenarios with extremely high demands on filtration quality.

The functions of bag air filters are primarily manifested in the following aspects:

• Efficient Filtration: By utilizing the filtering action of the filter bags, they effectively intercept solid particles in the air, including dust, pollen, bacteria, viruses, etc., achieving air purification.
• Protection of Downstream Equipment: In ventilation and air conditioning systems, bag filters often serve as prefilters, removing most dust particles to reduce the burden on downstream high-efficiency filters, thereby extending their service life.
• Improvement of Air Quality: By eliminating suspended particles and harmful substances in the air, they significantly improve indoor air quality, safeguarding people's health and living environment.
• Energy Conservation and Environmental Protection: With compact structures and high filtration efficiency, coupled with reusable and washable filter bags, bag filters reduce operational costs and energy consumption.
• Versatile Applications: Bag filters offer diverse installation methods and can be customized to suit different scenarios and requirements, widely applied in industrial purification processes such as central air conditioning ventilation systems, pharmaceuticals, hospitals, electronics, and food industries.
• Strong Pressure Resistance: Capable of withstanding high filtration pressures and water hammer-like pressure impacts, ensuring stable operation in harsh working environments.