Centrifugal blower is a mechanical device that relies on input mechanical energy to increase gas pressure and discharge gas. It is a passive fluid machinery.

Adopting the latest design and complying with the "three modernizations" standards, the two rows of large spacing cupola is a commonly used type of cupola in the domestic casting industry. Its main structural features are having two rows of air vents with a large spacing, and the bottom coke burns to form two independent combustion zones. By elongating the overheated zone, the distance of molten iron overheating and the intense combustion of bottom coke are increased, resulting in stable furnace conditions, high molten iron temperature, and good molten iron quality. According to the supply air temperature, it is divided into two structures: cold air and furnace hot air. Different melting requirements are achieved by supplying air at different temperatures. The hot air type of furnace chamber uses a dense rib furnace chamber heat exchanger to heat the physical heat in the furnace gas into the cold air of the furnace. The hot air temperature is around 180-250 ℃, which has the characteristics of not occupying workshop production area, compact structure, easy operation, and low thermal inertia.

Centrifugal fan is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate gas, then decelerate and change the flow direction, converting kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, gas enters the impeller from the axial direction, changes to the radial direction as it flows through the impeller, and then enters the diffuser. In a diffuser, the gas changes its flow direction causing deceleration, which converts kinetic energy into pressure energy. The increase in pressure mainly occurs in the impeller, followed by the expansion process. In multi-stage centrifugal fans, a reflux device is used to direct the airflow into the next impeller, generating higher pressure.

Centrifugal blowers are widely used in water treatment projects such as urban sewage and industrial wastewater, as well as industries and departments such as metallurgy, chemical industry, aquaculture, pneumatic conveying, and mining flotation, to transport air or other non-toxic and non corrosive gases. It can also be used for ventilation and induced draft in boilers and industrial furnaces, cooling and ventilation in air conditioning equipment and household appliances, drying and selection of grains; Wind tunnel wind source and inflation and propulsion of hovercraft.