Do you know the difference between Roots blower and screw blower?
There are significant differences between Roots blower and screw blower in multiple aspects. The following is a detailed comparison between the two:
1、 Structural Design
1. Roots blower:
It is mainly composed of two three leaf or four leaf rotors, which rotate synchronously and in reverse through gears on bearings without contact with each other.
There are several variable pressure chambers evenly distributed on the rotor. As the rotor rotates, gas is drawn in from the inlet, compressed through the gap between the rotor and the casing, and discharged from the exhaust port.
2. Screw fan:
Also known as a screw compressor, it is mainly composed of two interlocking screws (rotors) and a sealed casing.
Lubricating oil films are installed between the screws and on the inner wall of the casing to reduce wear and friction. When the screw rotates, the volume between them will constantly change, thereby achieving gas suction, compression, and discharge.
2、 Working principle
1. Roots blower:
Utilize the gap between two rotors and synchronous reverse rotation to compress and transport gas.
The gas is gradually compressed in the gap between the rotor and the casing, thereby achieving pressurization.
2. Screw fan:
The compression of gas is achieved through the rotational motion of the screw.
The volume change between the screws causes gas to be sucked in, compressed, and discharged.
3、 Performance characteristics
1. Roots blower:
It has the characteristics of stable air volume and small pressure fluctuations.
Low noise and vibration, relatively long service life.
The structure is relatively simple and easy to maintain.
2. Screw fan:
It has the characteristics of high speed, adjustable air volume, and stable pressure.
Relatively low noise, high conversion efficiency, and good energy-saving effect.
Suitable for occasions with high requirements for noise and vibration control.
4、 Application scenarios
1. Roots blower:
Widely used in industries such as electricity, cement, and mining, which typically require high air volume and medium to low pressure gas transportation.
Roots blower can meet these needs, and its simple structure and easy maintenance make it more advantageous in some harsh environments.
2. Screw fan:
Widely used in fields such as refrigeration, air conditioning, and air compression.
Due to its stable and low-noise characteristics, it has a wide range of applications in both home and commercial environments.
5、 Maintenance cost
1. Roots blower:
The structure is simple and relatively easy to maintain, so the maintenance cost is relatively low.
However, due to its relatively inadequate performance compared to screw fans, it may require more frequent replacement of components, thereby increasing long-term maintenance costs.
2. Screw fan:
The structure is complex and requires high maintenance technology, so the maintenance cost is relatively high.
However, due to its stable operation and low failure rate, maintenance costs can be effectively controlled in the long run.
In summary, there are significant differences between Roots blowers and screw blowers in terms of structural design, working principles, performance characteristics, application scenarios, and maintenance costs. Therefore, when making a choice, it should be comprehensively considered based on actual needs and operating environment.
