Design a convenient and reliable vacuum system, select the main vacuum pump is a key issue. Select the main vacuum pump can not only pursue a certain index, must be based on the conditions of use comprehensive consideration. How to choose the main pump of the vacuum system (1) Determine the type of main pump based on the ultimate pressure that the vacuum chamber needs to establish. General pressure limit of the main pump than the vacuum chamber to choose the ultimate low pressure to an order of magnitude. (2) Select the main pump according to the working pressure required for the production of the vacuum chamber. The operating point of the main pump should be chosen correctly. Within its working pressure range, the total amount of gas generated in the process of the vacuum chamber should be excluded. Therefore, the working pressure in the vacuum chamber must be within the optimum pump pressure range. (3) According to the size of the vacuum chamber and the required pumping time to choose the main pump. The volume of the vacuum chamber has an impact on the time it takes the system to reach the ultimate vacuum. When the pumping time required a certain time, if the larger the volume of the vacuum chamber, the greater the pumping speed of the main pump. (4) The correct combination of vacuum pump, vacuum pump aspiration, and sometimes choose a pump can not meet the pumping requirements, the need for several pump combination, complement each other to meet the pumping requirements. (5) If the vacuum system requires oil-free, you should choose a variety of non-oil pump for the main pump. If the requirements are not strict, you can choose a pump, and then add some oil pollution control measures, such as adding cold trap, baffle, oil well, etc., but also to achieve clean vacuum requirements. (6) When selecting a vacuum pump, you should know the composition of the gas being drawn, and select the appropriate pump for the composition of the gas being drawn. If the gas contains corrosive gases, dust particles, etc., you should consider choosing a dry vacuum pump, corrosion-resistant vacuum pump. Or install ancillary equipment on the pump inlet air duct. (7) Choose the main pump according to the economic indicators such as initial investment and daily maintenance cost of the entire vacuum system. (Editor: Li Juan) Further reading: Pump and Valve Tube Fittings Exhibition Information 2016 Exhibition Information
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