The selection of filter element skeleton needs to comprehensively consider the material, structural parameters and working conditions adaptability to ensure filtration efficiency and equipment stability.
skeleton material
Stainless Steel (e.g., 316L): Highly corrosion-resistant, suitable for chlorine-containing, high-temperature (200-300°C), or high-sulfur environments, with a service life of up to 5 years.
Carbon Steel (Q235): Galvanized for medium-temperature (<80°C) and low-corrosion applications, offering low cost.
Fiberglass: Temperature-resistant up to 120°C, suitable for applications such as hydraulic oil filtration, with a 300% increase in dirt holding capacity.
Structural Parameters
Diameter and Wall Thickness: The frame diameter is 10mm smaller than the filter bag (e.g., a Φ160mm filter bag with a Φ150mm frame). The wire diameter is 3-4mm (4mm for carbon steel, 3mm for stainless steel).
Pitch and Length: The spiral pitch is 20-30mm (a 6-meter-long frame has approximately 200 support points). Support points are placed every 25mm to ensure the filter bag is flat. End Structure: The upper end features a flange or threaded connection, while the lower end is sealed to prevent leaks.
Performance Matching
Filter Accuracy: Servo systems require a βx ≥ 75 filter ratio; 10μm is sufficient for general equipment.
Temperature Range: Stainless steel frame withstands temperatures from -50°C to +300°C; fiberglass ≤ 120°C.
Lifespan Rating: ≥ 10,000 cycles, washable models up to 20,000 cycles, and wind turbine-specific models achieve 10μm accuracy.
Notes: Prefer products certified to ISO 2941 (burst resistance) and ISO 3968 (pressure differential).
Avoid excessive pitch (>40mm) that may cause bag bulging or excessively small pitch that increases airflow resistance.