Vacuum generators | How do they work & Selection guide | Tameson

In this video, Max explains vacuum generators and how they work.
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Timecodes:
00:00 - Intro
00:34 - How do they work?
00:51 - Benefits
01:09 - 3 types
01:27 - Selection guide
02:12 - Silencers and filters
02:26 - Outro
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Hi I’m Max and today we’re going to talk about vacuum generators!

Vacuum generators are compact and relatively simple machines that generate a vacuum very quickly using compressed air. These types of vacuum generators are used in systems built for object handling such as pick-and-place operation.
Vacuum generators are typically used together with vacuum suction cups. A vacuum suction cup is connected to the vacuum generator’s outlet and is what is attached to the object being handled. More on suction cups in another video!

Vacuum generators operate on the Venturi effect and Bernoulli’s principle, which states that the higher the speed of the air, the lower the pressure. So by blowing compressed air at high speed through a nozzle, you can create suction and this is exactly what happens.

The benefits of using compressed air to create a vacuum is the fact that it is a very fast method, there are no moving parts so long lifetime and the generators are very compact and low-weight. Also, no heat is generated and they are relatively cheap. Do note that you need compressed air available to supply the vacuum generator.

There are three main types of generators:
- Single stage generators, the simplest type with one nozzle
- Multi-stage generators, these have multiple nozzles and create very high suction rates.
- Compact generators, these are more high-end and usually contain valves and communication hardware to integrate into a fully automated system

When selecting a vacuum generator it is important to take the following criteria into account:
- Suction rate: This is usually defined in m3/h or l/min. The maximum suction rate is defined as the maximum flow rate that the vacuum generator evacuates from the environment, this is free flow so the flow rate when something is picked up is lower. High suction rates are useful, for example, if you want to lift porous materials or if you need to pick up large objects.
- Vacuum level. The vacuum level is the level relative to the ambient pressure, so 80% means that the pressure is 80% lower than the ambient pressure.
- Evacuation time, the time that is required to create a vacuum
- And lastly the compressed air consumption

We recommend installing a silencer at the exit to avoid unwanted noise. In addition, we recommend installing a vacuum filter in the pipe between the suction cup and the ejector. This is especially necessary for dusty environments.
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