I have a question about vacuum pumps?
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May I ask, is there any relationship between the inlet pressure and the limit pressure in a vacuum pump? Do they influence each other?
Each pump has its own inherent operating range, and the appropriate model should be selected according to the markings indicated for it. As for extreme conditions, they go beyond the limits of its operating parameters, and it will then be unable to meet your work requirements.
There are two types of operational phenomena. One involves a sealed system with no material flow entering it; the pressure inside the system is reduced by the vacuum pump until it reaches a certain limit beyond which it can no longer decrease. This state is known as ultimate vacuum, and it depends on two factors: the performance of the vacuum pump and the leakage rate of the system. The other phenomenon occurs in processes such as vacuum distillation, where material is continuously fed into the system, and the vacuum pump continues to draw air out in order to maintain a certain pressure balance. It depends on the pumping speed, and has little to do with the pump’s ultimate vacuum
It’s okay; these two are completely different concepts that don’t fall under the same category
The ultimate pressure refers to the pressure reached when the inlet is completely closed; the inlet pressure, on the other hand, is the pressure under normal operating conditions. These two pressures cannot exist at the same time, but the inlet pressure is definitely higher than the ultimate pressure
In theory and in practice, as pressure approaches its limit, various phenomena occur, such as cavitation.
These issues can be attributed to the performance of the pump, including oil temperature, water content, etc