Roots blower and screw blower are common fan equipment in the fields of small and medium-sized sewage treatment, desulfurization and oxidation and textile texturing. There are great differences between the two kinds of blowers in operation principle, advantages and disadvantages and price. How should we understand the two kinds of blowers? Next, Qingyue energy conservation will explain it to you

除能耗上的差异外，螺杆鼓风机与罗茨鼓风机相比，同等条件下出口温升、压力脉冲、流量大小以及设备稳定性上，均占据一定优势。

In addition to the difference in energy consumption, compared with roots blower, screw blower has certain advantages in outlet temperature rise, pressure pulse, flow and equipment stability under the same conditions.

螺杆鼓风机与罗茨鼓风机相比，同样风量的产品，在初次采购成本上要高于后者；但在能耗及维护成本上，螺杆鼓风机要低于罗茨鼓风机。且这种优势会随着设备压力、以及使用的时间的增加，变得更加显著。

Compared with roots blower, the initial purchase cost of products with the same air volume is higher than that of Roots blower; However, in terms of energy consumption and maintenance cost, screw blower is lower than roots blower. And this advantage will become more significant with the increase of equipment pressure and use time.

罗茨风机和螺杆鼓风机都是属于容积式风机，如果两者要进行比较的话，可以简单归结为压缩原理的不同，螺杆鼓风机的节能、稳定、低噪优势更为突出。

Roots blower and screw blower are positive displacement fans. If the two are to be compared, it can be simply attributed to the different compression principles. The advantages of screw blower in energy saving, stability and low noise are more prominent.

罗茨风机在运转和输送空气的过程中，转子间的腔体不发生容积变化，压力来自于把大量的空气强制送入一个体积比较小的外部腔体中，如：管道或储气罐中，外部腔体中空气的密度不断提高，从而产生压力，通常称之为“外压缩”。罗茨鼓风机结构简单，强制送风（送风量不受排气压力影响），自身不产生压力。

During the operation and air delivery of Roots blower, the volume of the cavity between rotors does not change. The pressure comes from forcing a large amount of air into an external cavity with relatively small volume, such as pipeline or air storage tank. The density of air in the external cavity continues to increase, resulting in pressure, which is usually called "external compression". Roots blower has simple structure, forced air supply (air supply is not affected by exhaust pressure) and does not generate pressure itself.

而螺杆鼓风机的工作原理就跟罗茨鼓风机有些区别了，空气同样是吸进来，再排出去，吸气时，螺杆和螺杆之间的空腔是大的，随着螺杆转子的转动，腔体体积会逐渐变小，当气体排出去后，腔体容积会变得很小很小。也就是说，在旋转过程中，就相当于把2m?的气压缩成1m?的气，压力随之就提高，也就是说这个压力的提升不是来自于外围的管网，而是来自于主机腔体内部容腔的变化，也就是所谓的内压缩。

The working principle of the screw blower is somewhat different from that of the roots blower. The air is also sucked in and then discharged. When inhaled, the cavity between the screw and the screw is large. With the rotation of the screw rotor, the cavity volume will gradually decrease. When the gas is discharged, the cavity volume will become very small. In other words, in the process of rotation, it is equivalent to 2m? The air pressure is reduced to 1m? In other words, the pressure rise does not come from the peripheral pipe network, but from the change of the internal cavity of the main engine cavity, that is, the so-called internal compression.