Vacuum generator principle

- Jul 30, 2019-

In the automated production we are familiar with, common actions such as pushing, pulling, clamping, and blocking can be achieved through the pneumatic and electric actuators we introduced earlier.

However, if you need to carry glass, precision solar panels, or open soft and thin food plastic bags, you need to use another very important action to "suck" to correspond.

If you want to use the jaws..... I can’t panic.

So what should we do? At this time, we need the "vacuum" we mentioned above to achieve it!


Understanding of vacuum

    Before we discuss vacuum specifically, we need to understand what vacuum is, as the name implies, the degree of vacuum, that is, the degree to which the density of gas molecules in a space is in a standard state.

In short, the state that is stronger than a standard atmospheric pressure (about 101.3 KPa) is vacuum.

If specific quantification is required, it can be explained by pressure, ranging from -101.3 kPa to 0 kPa.


Of course, the so-called absolute vacuum does not exist.

Principle of vacuum generation

   Ok, now that we understand the concept of vacuum, we can now imagine how to create a vacuum.

Here, we are going to launch the famous Laval tube, the origin of this name is officially because of his inventor Swedish engineer Laval. In 1883, in the steam turbine he invented, the pipe was first used, hence the name.

Laval tubes are widely used in supersonic wind tunnels, jet engines, steam turbines, rocket propulsion and other equipment that require supersonic flow.

The reason is that the unique design of the injection pipe makes the supply pressure of the air supply port higher than a certain value, and after reaching a certain level, the nozzle emits a supersonic jet.


For the vacuum, we are not using the supersonic flow of the exhaust port. We use the viscosity generated by the supersonic gas. The high-speed jet absorbs the gas in the negative pressure chamber to form a negative pressure.

    Speaking of this, Xiaobian wants to say a few off-topics, and historical development is particularly similar. Just as we discovered electricity, we invented the original generator, and at the time did not really think about what we need to use it. Do something, let alone how to improve it, such as giving him a switch or something.

Therefore, the same is true for vacuum. First, we invented a device that creates a vacuum. Well, this is good, you see this artifact being


How can we put it down accurately and decently? There will always be people who come up with a solution. For example, to take the pick up and put it down into two steps, we call it "supply" and "destruction."