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+--- Téma: Selection of vacuum system (/Thread-Selection-of-vacuum-system)
Selection of vacuum system - yanyan - 2020-10-26
Selection of vacuum system
Under its working pressure, the vacuum pump should be able to discharge all the gas in the process of vacuum equipment process, and recognize the vacuum volume of the system. Check the time required to acknowledge the required vacuum, the flow resistance and leakage of the vacuum pipe. Considering the requirement of vacuum degree, adhere to the pumping rate of vacuum demand under certain process requirements after reaching the required vacuum degree; correctly combine the vacuum pump and recognize the appropriate stage ratio between the main pump and the previous stage pump; when planning the vacuum pipeline, the short and thick pipeline should be selected as far as possible, and the general pipe diameter should not be less than the inlet of the true empty pump.
In the planning of the vacuum system, the sealing performance of the system should be carried out to reduce the leakage rate of the system. Appropriate sealing data should be selected. The practical pumping volume flow of liquid ring vacuum pump is related to the working liquid. The higher the working fluid is, the higher the steam partial pressure is
The worse the condensing effect of the steam at the inlet of the pump is, the smaller the volume flow of the vacuum pump is. It is suggested to select the working fluid with low full vapor pressure. The temperature of the working fluid should be controlled together. As for the gas with high freezing point, such as glycerol, octamethylcyclotetrasiloxane and hexamethyltrisiloxane, etc., should be removed. In order to avoid these gases from entering roots pump and agglomerate and accumulate, it is necessary to move the temperature of roots pump, such as heating nitrogen; In the vacuum system planning, new skills should be selected to achieve active control and interlock protection.
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