Mixed-flow Explosion-proof Exhaust Fan

In the exhaust systems of chemical plant process areas, the solvent-laden air extraction of coating production lines, and the flammable gas discharge of petroleum storage areas, operating conditions often require both explosion-proof safety and certain pressure to overcome duct and purification equipment resistance, while also needing relatively large airflow to ensure timely discharge of flammable gases. Pure axial explosion-proof fans lack sufficient pressure; pure centrifugal explosion-proof fans are too bulky and have high noise. Our factory's Mixed-flow explosion-proof exhaust fan combines the high airflow of axial fans with the moderate pressure of centrifugal fans, while incorporating comprehensive explosion-proof design, optimized for medium-pressure, high-airflow exhaust in flammable and explosive environments - the ideal choice for such "dual-requirement + safety" conditions.

The Mixed-flow explosion-proof exhaust fan adopts mixed-flow impellers with complex three-dimensional blade shapes, mostly precision-cast from aluminum alloy or welded from stainless steel to ensure both anti-spark performance and profile accuracy. Within the impeller, gas moves along the mixed-flow direction, receiving both axial thrust and centrifugal pressurization, delivering higher pressure than axial fans while maintaining high airflow and low noise. The motor is a dedicated explosion-proof motor with Ex d (flameproof) or Ex e (increased safety) type, certified to national explosion-proof standards. For higher temperature or more corrosive flammable media, external long-shaft drive type is available, with the explosion-proof motor located outside the airflow and driving the impeller via a long shaft, avoiding motor contact with the medium. The casing is manufactured from thickened steel plate or stainless steel, with robust structure and tight joints; for higher requirements, the casing inner surface can be treated with anti-static coating. All electrical components are explosion-proof type, with reliable grounding terminals. Our factory's Mixed-flow explosion-proof exhaust fan strictly follows national explosion-proof standards (GB 3836) in design and manufacturing, with each unit undergoing explosion-proof performance inspection, dynamic balancing, and no-load running testing before shipping, ensuring safe and reliable operation in flammable and explosive environments. In the solvent exhaust system of a large automotive coating production line, air contains high concentrations of organic solvent vapors (toluene, xylene, etc.), classified as Zone 1 hazardous location, and needs to be sent through ducts to an activated carbon adsorption system for purification. A Mixed-flow explosion-proof exhaust fan with Ex d IIB T4 rating is installed to provide conveying power. Its mixed-flow structure delivers sufficient pressure to overcome duct and adsorption bed resistance while maintaining large airflow; its explosion-proof motor and aluminum alloy impeller ensure safe operation in high-concentration solvent vapor environments; its low-noise characteristic meets workshop environmental requirements - ensuring both production safety and environmental compliance - this is the core value of Mixed-flow explosion-proof exhaust fans in medium-pressure high-airflow hazardous location exhaust.

• Process area exhaust in chemical plants and petrochemical plants
• Solvent-laden air extraction in coating production lines and painting workshops
• Flammable gas discharge in petroleum storage areas and oil depots
• Exhaust in pharmaceutical factories' solvent workshops and chemical reagent warehouses
• Flammable dust extraction in wood processing plants and grain processing plants
• Exhaust in printing plants' ink workshops and dry cleaning shops

Our factory has 25 years focused on industrial fan manufacturing, with mixed-flow explosion-proof exhaust fans as a specialized safety product line. The factory covers over 10,000 square meters with over 100 employees, possessing professional explosion-proof fan manufacturing capabilities and quality management systems, equipped with dynamic balancing machines, CNC laser cutting machines, and explosion-proof electrical testing equipment, with monthly production capacity of 5 million RMB. Our explosion-proof fans strictly follow national explosion-proof standards in design and manufacturing, with products widely applied in chemical, petroleum, coating, pharmaceutical, and other industries, recognized by customers for safety and reliability.

Mixed-flow explosion-proof exhaust fans can be customized based on customer hazardous location classification and exhaust parameters. Explosion-proof rating selectable as Ex d IIB T4 or Ex e IIB T4 based on gas type and zone. Motor arrangement selectable as flameproof compartment (internal) or long shaft external based on medium temperature and corrosivity. Impeller material selectable as aluminum alloy or stainless steel; anti-static coating available. Casing material selectable as carbon steel or stainless steel. Inlet/outlet flange dimensions machined to customer ducts. Variable-frequency speed control with explosion-proof VFD available. MOQ is one unit; customization lead time is 10–15 working days.

Mixed-flow explosion-proof exhaust fans are safety products, with strict quality control. Explosion-proof motors are verified against explosion-proof certificates and nameplate parameters before warehousing. Impellers are inspected for material (aluminum alloy or stainless steel) and anti-static treatment. Welding is performed by certified welders, with casing welds undergoing kerosene leakage testing. Each impeller is dynamically balanced after assembly with accuracy no lower than Grade G6.3. Electrical connections are inspected for explosion-proof sealing and grounding reliability. After assembly, no-load running verifies current, vibration, noise, and motor surface temperature. Every product undergoes 100% inspection, accompanied by explosion-proof certificate copies and inspection records.

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