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

除能耗上的差異外，螺桿鼓風(fēng)機與羅茨鼓風(fēng)機相比，同等條件下出口溫升、壓力脈沖、流量大小以及設備穩定性上，均占據一定優(yōu)勢。

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.

螺桿鼓風(fēng)機與羅茨鼓風(fēng)機相比，同樣風(fēng)量的產(chǎn)品，在初次采購成本上要高于后者；但在能耗及維護成本上，螺桿鼓風(fēng)機要低于羅茨鼓風(fēng)機。且這種優(yōu)勢會(huì )隨著(zhù)設備壓力、以及使用的時(shí)間的增加，變得更加顯著(zhù)。

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.

羅茨風(fēng)機和螺桿鼓風(fēng)機都是屬于容積式風(fēng)機，如果兩者要進(jìn)行比較的話(huà)，可以簡(jiǎn)單歸結為壓縮原理的不同，螺桿鼓風(fēng)機的節能、穩定、低噪優(yōu)勢更為突出。

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.

羅茨風(fēng)機在運轉和輸送空氣的過(guò)程中，轉子間的腔體不發(fā)生容積變化，壓力來(lái)自于把大量的空氣強制送入一個(gè)體積比較小的外部腔體中，如：管道或儲氣罐中，外部腔體中空氣的密度不斷提高，從而產(chǎn)生壓力，通常稱(chēng)之為“外壓縮”。羅茨鼓風(fēng)機結構簡(jiǎn)單，強制送風(fēng)（送風(fēng)量不受排氣壓力影響），自身不產(chǎn)生壓力。

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.

而螺桿鼓風(fēng)機的工作原理就跟羅茨鼓風(fēng)機有些區別了，空氣同樣是吸進(jìn)來(lái)，再排出去，吸氣時(shí)，螺桿和螺桿之間的空腔是大的，隨著(zhù)螺桿轉子的轉動(dòng)，腔體體積會(huì )逐漸變小，當氣體排出去后，腔體容積會(huì )變得很小很小。也就是說(shuō)，在旋轉過(guò)程中，就相當于把2m?的氣壓縮成1m?的氣，壓力隨之就提高，也就是說(shuō)這個(gè)壓力的提升不是來(lái)自于外圍的管網(wǎng)，而是來(lái)自于主機腔體內部容腔的變化，也就是所謂的內壓縮。

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.