The comparison between rotary fan and Roots fan is as follows:
1、 Working principle
1. Rotary fan: suction compression is achieved by sliding the sliding blades of the eccentric rotor. Its working process consists of three parts: suction stroke, compression stroke, and exhaust stroke. The fan completes the suction, compression, and exhaust process once every rotation.
2. Roots blower: uses two blade shaped rotors to make relative motion in the cylinder to compress and transport gas. The synchronous gear at the rotor shaft end keeps the two rotors in mesh, and each concave curved surface on the rotor forms a working volume with the inner wall of the cylinder. During the rotation of the rotor, gas is taken away from the suction port, and when it is moved to the vicinity of the exhaust port and connected to the exhaust port, it is transported to the exhaust channel.
2、 Performance parameters
1. Rotary fan:
Airflow range: 0.31~5.41 cubic meters per minute
Pressure range: 9.8~49 kPa
Noise level: The noise level of silent or small rotary fans is only about 45 decibels, while the noise level of slightly larger or non silent fans is generally around 80 decibels
2. Roots blower:
Airflow range: 0.15~150 cubic meters per minute (varies by model)
Pressure range: 9.8~196 kPa
Noise level: Typically, the noise level ranges from 75 decibels to 110 decibels
3、 Application Fields
1. Rotary fan: mostly used for small sewage treatment aeration, sewage mixing aeration in hospitals, hotels, ships, laboratories, vacuum paper feeding in the printing industry, electroplating tanks, mixing aeration of industrial wastewater, plastic welding, air supply for packaging and blowing, spray of burners, glass industry and other fields.
2. Roots blower: widely used in the environmental protection industry (sewage treatment, desulfurization and dust removal), aquaculture, grain processing, steel smelting, pneumatic conveying, electricity, petrochemicals, cement, mining, textile, papermaking, printing, electronics and other sectors and fields of the national economy. Due to its good sealing performance, it can also be used for transporting flammable, explosive, and corrosive gases such as carbon monoxide, biogas, coal gas, hydrogen, acetylene, and carbon dioxide.
4、 Other characteristics
1. Rotary fan:
Advantages: low noise, small size, large air volume, low energy consumption, stable operation, easy installation, resistance to load changes, stable air volume, equipped with an air chamber, and smooth air dispersion.
Disadvantages: The air volume and pressure range are relatively small, making it unsuitable for large-scale projects.
2. Roots blower:
Advantages: Simple structure, easy manufacturing, wide pressure and flow range, able to meet more working conditions, gas transportation free of oil and dust, very environmentally friendly.
Disadvantage: The noise is relatively high and not suitable for projects with strict noise control.
5、 Choose Suggestions
1. Rotary fan: suitable for occasions with strict requirements for noise, low air volume and pressure, such as small sewage treatment, laboratory ventilation, etc.
2. Roots blower: suitable for occasions with high requirements for air volume and pressure, and can accept noise levels, such as large-scale sewage treatment, industrial gas transportation, etc.
