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The difference between centrifugal fan and negative pressure fan

Source: Time:2018-01-26 09:49:41 views:

The centrifugal fan is a machine which depends on the input mechanical energy to increase the gas pressure and send the gas side by side. It is a kind of driven fluid machinery.

The centrifugal fan is a machine which depends on the input mechanical energy to increase the gas pressure and send the gas side by side. It is a kind of driven fluid machinery. 

The negative pressure fan is a machine that uses the cooling principle of air convection and negative pressure ventilation, which naturally inhales fresh air from the opposite side of the installation site-the door or window, and quickly forces the indoor sultry gas out of the outdoors, and the poor ventilation problems can be improved. The effect of cooling and ventilation can reach 90% 97%. 

In terms of principle and product characteristics: 

According to the principle of converting kinetic energy into potential energy, centrifugal fan uses a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that the kinetic energy is converted into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when the gas flows through the impeller, and then enters the diffuser. In a diffuser, the gas changes the direction of flow and causes deceleration, which converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, followed by the pressure expansion process. In a multi-stage centrifugal fan, a return current is used to make the air flow into the next impeller, resulting in a higher pressure. 

The negative pressure fan adopts CAD/CAM design, which has the characteristics of low investment cost, large air volume, low noise, low energy consumption, smooth operation, long life, high efficiency and so on. The shutters are automatically raised and closed to achieve dustproof, waterproof, beautiful and generous; both blowing and ventilation can be done, which is a better choice for cooling and ventilation in modern workshops. The negative pressure fan with environmental protection and energy saving will become the mainstream of ventilation and cooling equipment market.

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