What is the difference between a centrifugal fan and a negative pressure fan?

Centrifugal fans are mechanical devices that rely on input mechanical energy to increase gas pressure and deliver gas. It is a driven fluid machine. Yuyao air cooler, Cixi air cooler

The negative pressure fan is the principle of cooling using air convection and negative pressure ventilation. It is a kind of opposite direction of the device---the door or the window naturally inhales fresh air, and the indoor hot gas is forcibly discharged out of the room. Any ventilation is unreasonable. Machines that can be improved, the cooling effect can reach 90%-97%.

In terms of principles and product features:

The centrifugal fan is based on the principle that kinetic energy is converted into potential energy. The high-speed rotating impeller accelerates the gas, then decelerates and changes the flow direction, so that the kinetic energy is converted into potential energy (pressure). In a single-stage centrifugal fan, gas enters the impeller from the axial direction, and the gas is changed to radial direction as it flows through the impeller, and then enters the diffuser. In the diffuser, the gas changes the direction of motion to cause deceleration, which converts kinetic energy into pressure energy. The increase in pressure occurs primarily in the impeller, followed by the expansion process. In a multistage centrifugal fan, a return flow is used to cause the gas flow to enter the next impeller, resulting in higher pressure.

The negative pressure fan adopts CAD/CAM planning for the whole machine. It has the characteristics of low capital cost, large air volume, low noise, low energy consumption, stable operation, long service life and high power. The blinds automatically open and close to reach dustproof, waterproof and beautiful appearance; It can be used for both air blowing and ventilation. It is the best choice for cooling and ventilation in modern workshops. The environmentally-friendly and energy-saving negative pressure fan will become the mainstream of ventilation and cooling equipment stores.