High temperature fans are mainly composed of impellers, casings, air inlets, motors, connectors, cooling fan blades, etc. The material of the high temperature fan has strong resistance to high temperature and high pressure. Widely used in chemical industry, petroleum, metallurgy, forging, electric power, nuclear power plant, environmental protection and other fields. The following introduces the working principle of the high temperature fan:
Working principle of high temperature fan:
The high-temperature fan works according to the principle of converting kinetic energy into potential energy. The high-speed rotating impeller accelerates the gas, then decelerates, changes the flow direction, and converts kinetic energy into potential energy (pressure). The impeller adopts multi-blade single-entry centrifugal impeller, which is made of high-quality galvanized sheet or cold-rolled steel sheet, and the blades are designed according to the principle of aerodynamics. The impeller consists of 10 backward inclined airfoil blades, a curved front disc and a flat rear disc. The material is made of high-quality steel plate with high strength and good durability, and has undergone strict dynamic and static balance correction. The air performance is good, the efficiency is high, and the operation is stable.
In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when passing through the impeller, and then enters the diffuser. In a diffuser, the gas changes direction of flow causing a deceleration, which converts kinetic energy into pressure energy. The increase in pressure occurs mainly in the impeller and secondarily in the diffusion process. In a multi-stage centrifugal fan, a reflux device is used to direct the airflow to the next impeller, creating higher pressure.
The air inlet adopts the convergent and streamlined vortex reduction form, the air flow loss is small, and the high-temperature fan has high working efficiency. The high-temperature fan casing and the motor are installed and connected by metal castings. The motor shaft head is equipped with cooling fan blades. The outer wall of the metal casting is provided with inlet and outlet pipe connections to cool the metal castings and the shaft head to ensure normal operation of the motor at high temperatures.
The common medium pressure fan is a centrifugal fan, the impeller is covered with a mechanical casing, and the center of the impeller is the air inlet. When the medium-pressure fan is working, the power equipment runs to drive the impeller to rotate, and the air is sucked in from the air inlet. During the rotation of the blades of the centrifugal fan, power is applied to the gas to increase the pressure and speed of the gas, and the gas is discharged from the exhaust port along the blade path under the action of centrifugal force.
During the working process of the medium-pressure fan, although the rotation of the impeller increases the pressure and speed of the gas, the various changes of the gas are small. Therefore, in the design and use of the centrifugal fan, the gas is usually regarded as incompressible. fluid to handle. The gas treatment process of medium pressure fans is completed in the same radial plane, so medium pressure fans are also called radial flow centrifugal fans.
Selection conditions of medium-pressure blowers for burners: Among the performance parameters of medium-pressure blowers, the more important ones are gas flow, pressure, delivered power, efficiency and impeller speed, etc., which must be paid attention to during the selection process. The gas flow parameter of the medium-pressure fan represents the volume of gas that the fan can handle per unit time, while the pressure of the medium-pressure fan refers to the internal gas pressure value during the working process of the medium-pressure fan.
The efficiency of the medium pressure fan refers to the ratio between the shaft power of the medium pressure fan and the effective power of the actual processed gas. The total pressure efficiency of centrifugal fans is about 90%, and in the future development of centrifugal fans, the efficiency value will be one of the further goals pursued by researchers.
High-temperature fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induction of boilers and industrial furnaces; cooling and cooling of air-conditioning equipment and household appliances Ventilation; drying and selection of grain; wind tunnel wind source and inflation and propulsion of hovercraft, etc.
