Principle is a positive displacement blower fan, there are two trefoil relative rotation of the impeller and the casing wall sealed space, because each wheel is involute or epicycloid envelope impeller and processing lines, three for each of the impeller blades are identical, while the two impellers are also identical, thus greatly reducing the processing difficulty. Impeller in the processing of numerical control equipment to ensure that the two impellers in the center from the same situation next, no matter what position the two impeller rotation, can maintain a certain minimum clearance to ensure the gas leak within the allowable range. Advantages clover Roots blower: Clover Roots blower fan economical and durable, no lubrication, long life, good dynamic balance of simple structure, easy maintenance, no internal lubrication, oil-free media delivery characteristics. The pump rotor is supported with a reliable anti-backlash structure, balancing rotating parts as detailed specifications Roots blower, and high-precision helical gears, therefore, smooth running, low noise, the use of more reliable, high differential pressure the long run. Roots blower, Zhucheng East Han Machinery Co., Ltd. (certified), Roots blower is provided by the East Han Machinery Co., Ltd. Zhucheng. Zhucheng East Han Machinery Co., Ltd. (www.dhlcfj.com) is an industry leader in Shandong Weifang, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Zhucheng East Han Machinery Co. led the staff warmly welcome all inquiries negotiations to create Zhucheng East Han Machinery Co., a better future.