What is called Roots fan, the difference between Roots fan and centrifugal fan

What is called Roots fan, the difference between Roots fan and centrifugal fan

INTRODUCTION

Air movement is an important process in industrial production and fans play an important role in this process. Among fans, Roots fans and centrifugal fans are two common types, each of which has its own characteristics. In this article, we will give a brief introduction to Roots fans and centrifugal fans and the differences between them.

Concept and working principle of Roots fan

Roots fan is a pulsation-free, regulator-free volumetric fan, which consists of a double impeller with a small gap between the impellers. When the impeller rotates, the air passing through the gap is drawn in and discharged to the outlet, thus creating a continuous airflow. The Roots fan works without pulsating airflow, so it is suitable for some occasions with high pressure requirements. It is mainly used for conveying clean gases or gases with low dust content.

Concept and working principle of centrifugal fan

Centrifugal fan is a kind of fan that uses centrifugal force to transfer airflow. It is mainly composed of casing, impeller, transmission device and other parts. When the impeller rotates, the air is pushed outward by the centrifugal force, resulting in an airflow. Centrifugal fans can generate large air pressure and are suitable for conveying gases, dust and granular materials, etc.

Structure and appearance characteristics

The Roots fan has a rectangular appearance and consists of two impellers mounted on the same axis, and the blades of the impellers are gear-shaped. Centrifugal fans, on the other hand, have a rounded appearance and usually have only one impeller with wider blades. Due to the differences in appearance and structure, Roots fans and centrifugal fans differ in their installation and maintenance during use.

Operating noise and vibration

Roots fans produce less noise and vibration during operation. This is mainly due to the special design of the impeller structure of Roots fans, which effectively reduces noise and vibration. Centrifugal fans, on the other hand, produce greater noise and vibration when rotating at high speeds, and require special attention to noise and vibration control during installation and use, so as not to affect the working environment and machine life.

Efficiency and energy consumption

Roots fans are usually more energy efficient than centrifugal fans under the same operating conditions. This is because the working principle of the Roots fan determines its relatively high efficiency, and it is also capable of frequency conversion speed regulation, thus saving energy. Centrifugal fans, on the other hand, are usually less efficient at high pressures and require an external regulator for speed control, which increases energy consumption to a certain extent.

Differences in application areas

Due to the differences in the operating principle and performance of Roots fans and centrifugal fans, they also differ in their areas of application. Roots fans are mainly used for conveying clean gases, fluctuating gases as well as flammable and explosive gases, while centrifugal fans are suitable for conveying dust, granular materials as well as high-temperature gases. At the same time, centrifugal fans have a slightly different range of application in terms of air pressure and speed, as the airflow characteristics are determined by the way the airflow is generated.

Conclusion

In conclusion, Roots fans and centrifugal fans have their own advantages and scope of application. When choosing a fan, it is necessary to make comprehensive consideration according to the specific work requirements and environmental conditions. It is hoped that through the introduction of this article, readers will have a clearer understanding of Roots fans and centrifugal fans, and will be able to better choose the fan that suits their needs.

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