Ultimate vacuum of vacuum pump system in vacuum unit

Very low vapor pressure: This is the most important performance of vacuum pump oil. Because vacuum units require high vacuum, paraffin-based narrow-cut lubricants are generally used. For diffusion vacuum pumps, silicone oil with low vapor pressure or other synthetic products can be used. oil.
Appropriate viscosity and good viscosity-temperature characteristics: The internal volume of the vacuum pump chamber is constantly changing to form an exhaust gas, and the lubricating oil should have suitable viscosity and viscosity-temperature characteristics.
Good thermal oxidation stability: The vacuum pump is continuously developing at high speed. Due to the high-speed friction between the sliding plate and the pump body, the oil temperature is increased, and the oil is easily oxidized and decomposed. Especially the diffusion pump vacuum unit is often operated under a high temperature environment. The vapor pressure in the system is increased and the degree of vacuum is lowered, so that the vacuum pump oil is required to have good thermal oxidation stability.
In order to achieve different product process specifications, work efficiency and equipment working life requirements, different vacuum sections need to choose different vacuum system configurations. For optimum configuration, the following points should be considered when selecting a unit vacuum pump: Determining the working range of the vacuum pump: First, the vacuum required to determine each process must be checked. Because each process has its own range of vacuum levels, it must be carefully studied. Determine the ultimate vacuum of the vacuum pump: Check the ultimate vacuum of the vacuum pump system based on the vacuum required to determine the process, because the ultimate vacuum of the system determines the optimal working vacuum of the system.
In general, the system's ultimate vacuum is 20% lower than the system's operating vacuum and 50% lower than the foreline's ultimate vacuum. Press the cover, the pumping (vacuum) indicator on the panel lights up, the vacuum pump starts pumping, the cover is automatically sucked, and the vacuum knob can adjust the degree of vacuum according to the packaging requirements. When adjusting, the scale is from low to high. Be small. When the pumping reaches the set time (ie the required degree of vacuum), that is, the pumping is finished, the pumping light is turned off, and the airing indicator is turned on to indicate that the charging starts. The inflation knob can adjust the length of the inflation time (that is, the amount of inflation), the method is the same as above. If you do not need to inflate, turn the power switch to the vacuum position, the program will automatically enter the vacuum package, and the charge indicator will go out. When the air pumping or inflation is completed, the indicator light will be extinguished, and the heat seal indicator light will be on, that is, the sealing program will be entered. The heat sealing time and temperature adjustment knob are arranged on the panel to adapt to different thickness materials, and the rotation time is adjusted when adjusting the time and temperature. To be small, prevent the heat seal temperature from suddenly increasing and burn out the heat seal fittings.

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