High pressure fan is divided into vortex fan and Roots fan, which refers to the fan with high working pressure.

旋涡风机又叫漩涡气泵，其基本原理是:当叶轮旋转时，因为离心力的功能，风向标气体往前向外运动，进而产生一系列螺旋状的运动。叶轮刀片间的空气呈螺旋状旋转并将泵体以外的气体挤进(由吸气口吸进)侧槽,当它进到侧通道之后，气体被压缩，随后又恢复到叶轮刀片间再度加快旋转。当空气顺着一条螺旋形轨道越过叶轮和侧槽时，每个叶轮片提升了压缩和加快的程度,伴随着旋转的开展，气体的动能提升，促使沿侧通道经过的气体压力更进一步提升。当空气抵达侧槽与排放法兰的连接点(侧通道在出口处变窄)，气体即被挤出叶片并经过出口消声器排出泵体。

Vortex fan is also called vortex air pump. Its basic principle is that when the impeller rotates, due to the function of centrifugal force, the wind vane gas moves forward and outward, resulting in a series of spiral movements. The air between the impeller blades rotates in a spiral shape and squeezes the gas outside the pump body into the side groove (sucked in by the suction port). When it enters the side channel, the gas is compressed, and then returns to the impeller blades to accelerate the rotation again. When the air crosses the impeller and side slot along a spiral track, each impeller blade improves the degree of compression and acceleration. With the development of rotation, the kinetic energy of the gas increases, which further increases the gas pressure passing along the side channel. When the air reaches the connection point between the side slot and the discharge flange (the side channel narrows at the outlet), the gas is squeezed out of the blade and discharged from the pump body through the outlet muffler.

罗茨风机为容积式风机，运输的风量与转速成比例，三叶型叶轮每旋转一次由2个叶轮开展3次吸、排气，与二叶型相比，气体脉动减少，负荷变化小，机械强度高，噪声低，振动也小。在2根平相行的轴上设有2个三叶型叶轮，轮与椭圆形机箱内孔面及各叶轮三者间始终保持微小的间隙，因为叶轮相互之间反方向匀速旋转，使箱体和叶轮所包围着的一定的气体由吸进的一侧输送到排出的一侧。各支叶轮始终由同步齿轮维持正确的相位，并不会发生互相碰触现象，因此能够 高速化，不用内部润滑，并且构造简易，运转稳定，性能稳定，适用各种用途，已应用于广泛的领域。旋涡风机和罗茨风机有很大的区别，结构形式和基本原理及工作特性都不同。

Roots fan is a positive displacement fan. The air volume transported is proportional to the speed. Each time the three blade impeller rotates, two impellers carry out suction and exhaust for three times. Compared with the two blade impeller, the gas pulsation is reduced, the load change is small, the mechanical strength is high, the noise is low and the vibration is small. Two three blade impellers are arranged on the two parallel shafts, and a small gap is always maintained between the wheel and the inner hole surface of the oval box and each impeller, because the impellers rotate at a uniform speed in the opposite direction, so that a certain amount of gas surrounded by the box and the impeller is transmitted from the suction side to the discharge side. The correct phase of each impeller is always maintained by the synchronous gear without touching each other. Therefore, it can be high-speed without internal lubrication, simple structure, stable operation and stable performance. It is suitable for various purposes and has been used in a wide range of fields. There are great differences between vortex fan and Roots fan, with different structural forms, basic principles and working characteristics.

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