The quality of the vacuum pump depends on its mechanical structure and the quality of the oil, so it needs to be ensured when it is used. If volatile organic solvents are distilled, the organic solvents will be absorbed by the oil and increase the vapor pressure, thus reducing the evacuation efficiency; if it is an acidic gas, it will corrode the oil pump; if it is water vapor, it will turn the oil into an emulsion and pump out the vacuum pump.
The function of a Roots vacuum pump is to extract gas molecules from the vacuum chamber and reduce the gas pressure in the chamber to achieve the required vacuum level. Generally speaking, there is a large range from atmospheric to very high vacuum, and so far there is no vacuum system that can cover this range. Therefore, different vacuum system configurations should be selected depending on the process specifications, productivity and equipment life requirements of the different products as well as the vacuum band. When selecting a vacuum system to obtain a configuration.
Please cnsider the following matters:
I. Type of gas to be extracted and extraction volume
Check the type of extraction required by the process and the extraction technique. This is because the type of gas being drawn in can contaminate the Roots vacuum pump system by reacting with the liquid in the pump. In addition, consider determining the appropriate exhaust time and the amount of gas produced during the intake process.
Second, the vacuum degree
Vacuum degree determines the product used in what structure, vacuum degree is the gauge pressure and pressure of these two readings.
In other words, the closer the reading is to “0”, the higher the vacuum. But on the other hand, the closer the pressure is to 760mmh, the higher the vacuum level is. If the required pressure (vacuum) is close to “0”, only the vacuum pump can meet this demand, but if the demand is close to 1bar (atmospheric pressure), then you can choose the Roots fan or centrifugal fan to meet this demand.
Third, the work of the Roots vacuum pump to determine the vacuum range
Need to determine the vacuum required for each process. Because each process has an adapted range of vacuum degree, so it is necessary to carefully study what kind of vacuum is suitable for this process.
IV. Vacuum volume check
Determine the time required to reach the required vacuum level, the flow resistance of the pipeline, and the leakage volume. After reaching the required vacuum degree, consider maintaining the inhalation rate under certain conditions of process requirements.
V. Determination of vacuum degree
In order to make the vacuum of the system to determine the working vacuum of the system, according to determine the vacuum required by the process to check the vacuum of the Roots vacuum pump system. The vacuum of the system is generally 20% lower than the working vacuum of the system, and 50% lower than the vacuum of all stage pumps.
Of course, common sense is only the result of theoretical calculations and does not take into account various variables such as piping flow resistance, leakage, filter flow resistance, extraction gas temperature, and so on. In practice, a safety factor also needs to be considered.
