Suggestions for selection and design of vacuum system
The working pressure of the selected vacuum pump shall meet the vacuum limit and working pressure requirements of the vacuum equipment; Each pump has a certain range of working pressure, should choose the pump working point in this range; Check and determine the type and volume of pumping required for the process.
The characteristics of the gas, such as corrosion, cohesion, etc., should be analyzed.
Because if the type of gas pumped reacts with the liquid in the pump, the pump system will be contaminated.
At the same time, it must be considered to determine the appropriate exhaust time and exhaust process produced by the gas footprint.
At its operating pressure, the vacuum pump shall be able to remove all gases generated in the process of vacuum equipment and determine the vacuum volume of the system.
Check to determine the time required to reach the required vacuum, flow resistance, and leakage of the vacuum piping.
The proper stage ratio between the main pump and the front pump can be determined by the correct combination of the vacuum pump and shorter, coarser piping, taking into account that the required vacuum can be achieved and the required pumping rate can be maintained under certain process conditions. Should be used as far as possible in the design of vacuum piping, and the general diameter of the pipeline is not less than the inlet of the vacuum pump.
In the design of vacuum system, the sealing performance should be improved and the leakage rate should be reduced. Appropriate sealing materials should be selected. The actual volume flow of the gas pumped by the ring vacuum pump is related to the working liquid.
The higher the working liquid is, the higher the partial vapor pressure is, and the working liquid is vacuum-vacuum.
The worse the condensing effect of the inlet steam of the pump, the smaller the volume flow of the pumped gas of the vacuum pump.
It is suggested to select the working medium with low saturated vapor pressure and control the temperature of the working medium at the same time. For gases with high freezing point, such as glycerin, octamethylcyclotetrasiloxane and hexamethyltrisiloxane, the temperature of the roots pump should be increased to avoid condensation and deposition of the gas into the roots pump, such as heating nitrogen to raise the temperature. Pump. Adopt new technology to realize automatic control and interlock protection.
