Festo - Vacuum generators

Open silencers on vacuum generators

Wed, 03 Apr 2013 06:09:02 +0200

Why should open silencers be used for vacuum generators? Over time, a closed silencer becomes contaminated on the inside with dirt particles which are larger than the porosity of the body of the silencer. As the contamination increases, back pressure gradually develops in the vacuum generator (vacuum performance reduced – maintenance necessary). With an "open silencer", dirt particles can be sucked in via the laval nozzle, which then leave the silencer again with the air flow. Advantages: reliable, safe to operate and maintenance-free.

Air-saving circuit with vacuum generators

Tue, 02 Apr 2013 11:27:29 +0200

What is an air-saving circuit? When a vacuum generator is being used without other additional functions, it requires energy for as long as "Vacuum on" is active. If a vacuum generator with vacuum monitoring via a sensor and an integrated non-return valve is being used, the vacuum only needs to be created (and thus energy consumed) if the vacuum falls below a predetermined level. As long as the vacuum in the system remains within the preset limit values, the vacuum generation is automatically deactivated to save energy. An air-saving circuit like this can be controlled via a PLC. However, the control system can also be fully integrated into a vacuum generator.

Air velocity in a vacuum generator

Tue, 02 Apr 2013 11:26:05 +0200

At what speed does the air flow through a vacuum generator? The air velocity in a vacuum generator reaches a value greater than Mach 3. Mach 1 = speed of sound Mach 2 = twice the speed of sound Mach 3 = three times the speed of sound etc.

Function of a vacuum generator

Thu, 28 Mar 2013 13:20:18 +0100

How does a vacuum generator work? Festo vacuum generators operate according to the venturi principle. The compressed air flows from the pressure supply port into the ejector. The constriction in the venturi nozzle increases the flow velocity of the air to supersonic speed. After exiting the venturi nozzle, the air expands and flows through the receiver nozzle into the outlet port (silencer). In the process, a vacuum is created in the chamber between the venturi and receiver nozzles, which causes air to be drawn in from the vacuum port. The vacuumed air and exhaust air both leave through the outlet port (silencer). Why must vacuum generators always be operated with unlubricated compressed air? If lubricated compressed air is used, dust and dirt particles from the air which is sucked in can settle in the silencer or even in the vacuum generator, thus impairing the suction performance.

Evacuation time

Thu, 28 Mar 2013 12:46:23 +0100

What does the evacuation time indicate? The evacuation time is the time required for a vacuum generator to evacuate a volume of 1000 cm³ (1 litre).

Decentralised vacuum generation

Thu, 28 Mar 2013 09:45:21 +0100

What are the advantages of decentralised vacuum generation? Vacuum generation only when needed and directly in the gripping area (economic efficiency) Minimum line / tube lengths and maximum efficiency Fast evacuation and cycle times Controlled setting down due to reliable ejector pulse Due to the short tube lengths, the evacuation times can often be achieved with smaller vacuum generators (lower air consumption)

Air supply time of vacuum volumes

Wed, 27 Mar 2013 12:24:36 +0100

What does the air supply time indicate? The air supply time is the time required for the air to reduce a vacuum (of 6 bar for p1) to a residual vacuum of -0.05 bar for a volume of 1000 cm³ (1 litre). (Air is supplied backwards through the silencer via the laval nozzle).

Handling Guide

Tue, 16 Oct 2012 17:20:19 +0200

The competence brochure for standard handling systems from Festo

Vacuum generators for all applications

Tue, 13 Mar 2012 14:30:07 +0100

This poster will help you to choose the right vacuum ejector for your application – and thus ensure that you can continue in the future to generate vacuum

economically, reliably and conveniently.

Manual Support Portal

Wed, 15 May 2013 13:34:49 +0200

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