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4. Roots Vacuum Pump 
     Roots pump production from abroad situation, several large companies abroad, such as Leybold, Balzers, Alcatell, Edwards and ULVAC, they pump each Roots Roots pump sales accounted for global sales ratio of no more than 5% This 5 Total 20% only, Roots pump output, but Roots pump prices abroad than domestically produced much higher pump. At present, almost all domestic and foreign large or small, high-vacuum and in vacuum system, in order to shorten the extraction time and improve production efficiency with a Roots pump, Roots pump so made must be based on the occupation of the domestic market managed to enter the international market , so that must be made to further reduce vibration and noise of the Roots pump, oil seal solve problems, and improve the appearance of quality pumps to improve the pump and the cleanliness of the finish. In addition, we must also consider the fact that some countries and regions of the power frequency of 60Hz, but also to ensure that the Roots pump speed in improving the circumstances of the reliability of long-term operation.