The 4-2X73 series is mainly used for large-scale induced draft and dust removal systems in industries such as metallurgy, power generation, cement, etc. Due to the development of production, boiler capacity and steel-making furnace volumes have increased, and the volume of smoke gas during the smelting process has also grown, leading to serious atmospheric pollution.
The 4-2X73 series is mainly used for large-scale induced draft and dust removal systems in industries such as metallurgy, power generation, cement, etc. Due to the development of production, boiler capacity and steel-making furnace volumes have increased, and the volume of smoke gas during the smelting process has also grown, leading to serious atmospheric pollution. As environmental regulations become stricter, the demand for smoke and dust purification has led to the design of dust removal fans with double inlet, large flow, medium-high pressure, low noise, versatility for hot and cold media, flat performance curves, and wide efficient operation ranges. This design also allows for use in other ventilation systems with similar performance, but the medium temperature must not exceed 250°C. A dust removal device must be installed in front of the induced draft fan to minimize dust content in the smoke gas entering the fan (typically not exceeding 200mg/m³). According to common user requirements, the dust removal efficiency should not be lower than 85%, otherwise, it will shorten the life of the impeller.
Product Features:
①The design of this series of fans is based on aerodynamic sketches determined through fan model tests and employs patented technologies, including a conical intake, long-lasting backward blades, anti-oil-leak bearing housing, self-aligning and differential adjustment doors, and a rotating device (if required by the user).
②The efficient operating range is wide, making it easy to select a high-efficiency operating point.
③The patented conical intake technology eliminates strong vortices in front of the inlet, ensuring stable intake and improving overall fan efficiency.
④The impeller uses backward-curved wing blades, reducing air flow impact, enhancing stability, preventing motor overload, and employing durable wing-shaped wear-resistant tips. Wear-resistant liners are added to high-wear areas, increasing the strength and durability of the impeller and extending its service life.
⑤The anti-oil-leak bearing housing uses a lap-type oil throw ring, which directs the high-speed rotating bearing oil back to the oil pool via the bearing housing wall. The labyrinth seal at the bottom is equipped with an oil return hole to ensure the oil that has not been fully filtered returns to the oil pool. The external skeleton oil seal increases resistance along the axial direction to retain some of the thin oil, improving dust-proof performance. The upper part of the bearing housing has a vent plug to reduce the slight positive pressure inside the housing, and the side of the housing features an oil level indicator for accurate oil level monitoring. A sliding bearing can also be used as per user requirements.
⑥The self-aligning, differential adjustment door features an adjusting bearing at the pivot point of the guide vanes. The link between the two sides of the adjustment doors is self-aligning, and different angle transmission rods are used to allow different opening adjustments during the regulation process, achieving differential adjustment. This results in a smaller torque, no “dead spots” during operation or adjustment, and a flexible, safe, and reliable adjustment mechanism, ensuring the motor of the actuator does not overload.
⑦The fan comes with a complete set of accessories, including a coupling cover, matching flanges for the inlet and outlet, machine foundation bolts, soft connections for the inlet and outlet, temperature measuring instruments (Pt100), vibration measurement devices, and optional slow-running devices, electric actuators, or silencers.
⑧Comprehensive technical data is provided, including the weights of main components, static and dynamic loads, rotor moment of inertia, adjustment door torque, and external dimensions.
⑨Quality Protection Measures:
(1)Designed and manufactured according to national and industry standards.
(2)Fan performance calculated based on model tests.
(3)Impellers and shafts undergo non-destructive testing according to standards.
(4)Reinforced, wear-resistant impellers.
(5)Soft connections are provided at the inlet and outlet to prevent deformation stress interference between the pipeline and fan.
(6)The rotor is equipped with a vibration protection device.
(7)A slow-running device is used to prevent shaft bending when the fan is off (especially in high-temperature conditions).
