来源：https://www.sdqyjn.com/ 日期：2021-07-27 浏览量：
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
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.
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.
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.
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.
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.