Before we dive deep into the Vacuum Ejector products that you can get from the market, let’s first start with understating what exactly a vacuum ejector is. Vacuum Ejectors work on the venture principle i.e. they use the principle of pneumatics and uses much simpler design in comparison to vacuum generator. In simpler words, Vacuum Ejectors are used to create vacuum by changing the flow/pressure of the compressed air. These vacuum ejectors can be used in different machines that require vacuum generation for proper functioning.

NameImageSuction rateAir consumptionPrice
SEG 30 LS SDA370 l/min392 l/min$$$
Vacuforce CV10HSK27 l/min44 l/min$$
SMC ZH07BS-06-067 l/min13 / min$
SMC ZL112-EE27L100 l/min63 l/min$$$$

The working of ejectors will be explained in detail later on. Since you have an idea about what a vacuum ejector is, let’s have a look at a few vacuum ejectors that can easily be found in the market.

SEG 30 LS SDA Basic Vacuum Ejector

SEG 30 HS SDA Basic Vacuum EjectorIt is a compact light weight ejector that can be used with household vacuum systems. Here are the complete details about this product

Details

  1. Nozzle Size: 3.0 mm
  2. Suction rate: 240 l/min
  3. Air consumption: 392 l/min
  4. Weight: 14.4 ounces
  5. Length: 90 mm
  6. External diameter: 31 mm

Pros

  1. No heat generation
  2. No moving parts
  3. Vacuum is on and off immediately with the air supply
  4. Low cost
  5. Quick to repair or replace

Cons

  1. Needs some technical knowledge to operate
  2. A bit heavy compared to other ejectors

Vacuforce CV10HSK CV Vacuum Venturi Generator

CV10HSK Vacuum EjectorThis venturi vacuum generator is the second in the list of our top vacuum ejectors. This vacuum generator is a light weight but tough ejector that can be used with almost every vacuum system. Although it’s small and light weight, it has an all aluminum body which is a huge plus.

Details

  1. Anodized Aluminum Body
  2. Single Stage Technology
  3. Vacuum Flow Rates up to 8CFM
  4. Maximum Vacuum of 27″Hg
  5. Single Stage Technology
  6. Nozzle Size: 1.0 mm
  7. Weight: 4.3 ounces
  8. Length: 45 mm

Pros

  1. Light weight
  2. Small
  3. Small nozzle
  4. All metal construction
  5. Reliable

Cons

  1. Single stage technology
  2. A bit pricey

SMC ZH07BS-06-06 vacuum ejector

This vacuum ejector comes in a lot of nozzle sizes which makes it really easy to pick the best one for your situation. The vacuum ejector is very light weight and, therefore, suitable for a lot of household medium duty vacuum systems.

SMC ZH07BS Vacuum Generator

Details

  1. Nozzle Size: 0.5, 0.7, 1.0, 1.3, 1.5, 1.8, 2.0 mm
  2. Suction rate: 5-85 l/min (Type S) or 8-135 l/min (Type L). Note: The range is for all nozzle sizes. The exact suction rate will depend on the exact nozzle size.
  3. Air consumption: 13-185 l/min. Note: The range is for all nozzle sizes. The exact air consumption rate will depend on the exact nozzle size.
  4. Weight: 0.9 – 3.35 ounces (depending on the size of the nozzle)
  5. Built-in silencer
  6. Available in 2 types: box type and direct piping type

Pros

  1. Compact
  2. Light weight
  3. Vacuum is on and off immediately with the air supply (quick response)
  4. Mountable body

Cons

  1. Might need some technical knowledge to pick the right nozzle size

SMC ZL112-EE27L vacuum ejector

A heavy duty vacuum ejector that comes with multiple options to choose from. It comes in the standard type as well as with the valve. Although it is a bit pricey but it is suitable for all type of vacuuming systems whether light weight or very heavy weight (industrial) systems.

SMC ZL112 Vacuum Ejector

Details

  1. Nozzle Size: 1.22 mm
  2. Suction rate (max): 100 l/min
  3. Air consumption: 63 l/min
  4. Max vacuum pressure” -84 kPa
  5. Operating temperature range: 5 to 50 °C
  6. Weight: 25.8 ounces (will vary depending on whether you have the valve or standard)
  7. Supply/release valve combination

Pros

  1. Multistage Ejector Technology
  2. A lot of options to choose from (valve or standard)
  3. Suitable for a lot of different situations
  4. Small nozzle
  5. Reliable

Cons

  1. Requires technical knowledge to understand the various models
  2. Heavy
  3. Very pricey

Vacuum Ejectors: How they work

Now, let’s talk about how the Vacuum Ejectors work, in detail. First, have a look at the parts of a typical vacuum ejector

  • Chest
  • Nozzle
  • Throat
  • Discharge
  • Suction
  • Motive Gas
ejector suction cup

The same principle of vacuum ejector used for suction cup

The air is usually entered from the Motive Gas section and through the throat area. As the compressed air leaves the throat (which is a restricted area) to the larger area (discharge), the pressure falls, and the velocity increases. The intensity is such that a vacuum (lower pressure than ambient air pressure) is formed and air to be evacuated from the process is pulled into the flowing airstream and blown out.

This is the basic principle of the Vacuum Ejector and how it works. The main point here is that it creates a pressure difference between the incoming and outgoing air which creates a suction/vacuum. The size of each area can vary from product to product to add some variations to the vacuum generation process.

Types

The Vacuum Ejectors come in 2 major types.

  • Single Stage Technology
  • Multi Stage Technology

The main difference between single stage and multi stage ejectors are the nozzles (or stages). The explanation given above is that of a single stage ejector because it has only a single stage (1 nozzle 1 throat) and these type of ejectors are somewhat limited. The multistage ejector will usually have multiple nozzles and throats (and other parts) to control the flow of the air in stages. As you might have already guessed, the multistage ejector has more control over the air flow and pressure and, therefore, provides more efficiency.

Benefits

Here are some of the major benefits you will get with using the vacuum ejectors

  1. No vibration, heat generation and moving parts
  2. Vacuum is on and off immediately with the air supply
  3. Low cost and requires very little or no maintenance at all
  4. Can be located very close to the process, reducing the amount of evacuation air and offering faster cycle times
  5. Lightweight and mobile
  6. No electricity required
  7. High vacuum level with relatively small flow rate
  8. Any mounting position

Conclusion

Vacuum ejectors are a very useful alternative to a mechanical pump and lots of other vacuum generating equipment. Not many truly understand how the vacuum ejectors work and what can be achieved with the proper usage of these equipment. There are, of course, limitations to the usage of these items but they can certainly make your vacuuming systems very effective, if used correctly.