How does a vacuum generator work?

The working principle of the vacuum generator can be divided into three stages: 1. The pumping stage, connecting the target container or system through the suction pipe to establish a low-pressure area inside it; 2. The mid-range stage, when the pressure decreases After reaching a certain value, the interaction force between gas molecules becomes smaller and smaller, the free path between molecules increases, and the speed of gas molecules increases; 3. In the high vacuum stage, when the pressure is further reduced, the interaction between gas molecules The collisions become extremely sparse and there are almost no collisions. At this time, the gas molecules are mainly ejected from the wall, thus producing a "wall effect".

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

A vacuum generator is a device used to generate a high vacuum environment. Its working principle can be divided into three stages:

1. Pumping stage: First, the vacuum generator will connect the target container or system through the suction pipe to establish a low-pressure area inside it. At this time, the external pressure will push the gas into the outlet of the system, while the outlet of the vacuum generator maintains a low pressure state, thus forming a certain exhaust air flow.

2. Mid-range stage: When the pressure drops to a certain value, the interaction force between gas molecules becomes smaller and smaller, the free path between molecules increases, and the speed of gas molecules increases. At this time, the elastic rebound loss of gas molecules after they collide with the wall also becomes larger, so the rate at which gas molecules are ejected from the wall increases. At the same time, due to too frequent collisions between the wall and gas molecules, the heat generation decreases as the number of gas molecules decreases, resulting in a drop in temperature, which is what we often call the "low temperature vacuuming" stage.

3. High vacuum stage: When the pressure is further reduced, the collisions between gas molecules become extremely sparse and there is almost no collision. At this time, the gas molecules are mainly ejected from the wall, resulting in "Wall effect". At this time, the air pressure is called high vacuum. In a high vacuum state, the number of gas molecules is very small and almost negligible. At the same time, the high vacuum state also has the characteristics of good stability, small relevant interference, and more accurate measurement.

In summary, the working process of the vacuum generator is to pass the gas in the target container or system through the pumping stage and the mid-range stage, so that the air pressure is reduced, and finally reaches a high vacuum state.

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