Abroad, Roots blowers have been basically eliminated due to problems such as small capacity, low efficiency, high noise, and uneven air supply.

Roos

By the 1990s, foreign scholars creatively applied the ternary flow theory to centrifugal blowers, and some manufacturers designed and manufactured single-stage centrifugal blower products based on this. Compared with Roots blowers and multi-stage low-speed centrifugal blowers, single-stage centrifugal blowers The three-stage centrifugal blower has the advantages of high efficiency, small footprint, wide flow adjustment range, and high level of automation. It has been widely used around the world.

Single stage centrifugal blower

Air suspension blowers began to sprout in South Korea in the late 1990s. With the beginning of civilian aviation in the United States, aviation air impellers were introduced into air suspension blowers. A group of expert teams from the Korean Research Institute specializing in air suspension technology participated in the technical research and development of Neuros air suspension fans. They improved the frequency conversion stability of the fans, the heat dissipation of the whole machine and the operating point efficiency, and made the air suspension Blower taken to new heights.

air suspension blower

The concept of magnetic levitation was proposed in the mid-19th century. Countries such as Europe, the United States, and Japan began to vigorously carry out research on magnetic levitation bearings in the 1960s. Since the mid-1990s, foreign countries have begun to study high-speed magnetic levitation motors. Various types such as permanent magnet synchronous magnetic levitation motors, switched reluctance magnetic levitation motors, and induction magnetic levitation motors have appeared one after another, and are mainly used in centrifugal compressors. Entering the 21st century, magnetic bearing technology has become more mature. There are dozens of foreign companies producing magnetic bearing technology-related products, such as SKF in Sweden, Waukasha in the United States, Sulzer in Switzerland, Luster in Germany, and Seiko Co., Ltd. in Japan. Corporations and other companies have magnetic bearing products that are used in different fields.

Luoyang Zhongjia Control Technology Co., Ltd. Maglev Blower

Generally speaking, due to its simple structure and low technical threshold, Roots blowers were widely used in many occasions that required air supply in the early years. However, the energy consumption of such fans was high, resulting in high operating costs; later, centrifugal impeller technology appeared. However, in the absence of high-speed drive, blower manufacturers began to use multi-stage compression to improve the efficiency of the blower. This type of blower is widely used in medium-sized and above-sized sewage treatment plants; with the development of high-speed gearbox technology , the gear-increasing single-stage centrifugal blower appeared, which further improved the efficiency of the fan. However, the gearbox cost was high, the structure was complex, and the maintenance cost was high. As a result, this type of fan was not widely used. Since then, magnetic levitation/air suspension centrifugal fans have appeared. , completely solving several problems such as high-speed drive, transmission, friction loss, and overall efficiency optimization.