离心风机是依靠输入的机械能,提高气体压力并排送气体的机械,它是一种从动的流体机械。

Centrifugal fan is a kind of driven fluid machinery, which depends on the input mechanical energy to increase the gas pressure and discharge the gas.

而负压风机是利用空气对流、负压换气的降温原理,是一种由安装地点的对向---大门或窗户自然吸入新鲜空气,将室内闷热气体迅速强制排出室外,任何通风不良问题均可改善的机器,降温换气效果可达90%-97%。

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

在原理及产品特点上：

In terms of principle and product features:

离心风机是根据动能转换为势能的原理,利用高速旋转的叶轮将气体加速,然后减速、改变流向,使动能转换成势能（压力）。在单级离心风机中,气体从轴向进入叶轮,气体流经叶轮时改变成径向,然后进入扩压器。在扩压器中,气体改变了流动方向造成减速,这种减速作用将动能转换成压力能。压力增高主要发生在叶轮中,其次发生在扩压过程。在多级离心风机中,用回流器使气流进入下一叶轮,产生更高压力。

According to the principle of converting kinetic energy into potential energy, the centrifugal fan uses the high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction to convert kinetic energy 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 flowing through the impeller, and then enters the diffuser. In the diffuser, the gas changes the flow direction to cause deceleration, which converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, followed by the diffusion process. In the multistage centrifugal fan, the reflux device is used to make the air flow enter the next impeller to produce higher pressure.

负压风机则整机采用CAD/CAM设计,具有投资成本低,风量大,噪音低,耗能小,运行平稳,寿命长,效率高等特点,百叶窗自动起闭达到防尘,防水,美观大方；既可吹风,也可抽风,是现代化车间降温通风的******选择。环保、节能的负压风机将成通风降温设备市场主流。

The negative pressure fan adopts CAD / CAM design, which has the characteristics of low investment cost, large air volume, low noise, low energy consumption, stable operation, long service life and high efficiency. The shutter can be opened and closed automatically to prevent dust, waterproof and beautiful; It can be blown or pumped. It is a * * * * * * choice for cooling and ventilation in modern workshops. Environmental protection and energy-saving negative pressure fan will become the mainstream of ventilation and cooling equipment market.

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