The AIRTEC central ejectors function according to the Venturi principle. Compressed air with 4 to 6 bar flows through a protective filter in the compressed air supply port (1.1) into the ejector creating a vacuum in the mixing chamber (C). The vacuum line is evacuated via connection (2) and another protective filter.
A check valve (D) between the mixing chamber (C) and connection (2) as well as in connection (1.2) seal off the vacuum system to the atmosphere so that in the event of the compressed air supply being interrupted in an airtight vacuum system, the vacuum remains unaffected.
To this end, the production series HV-SA with flange-mounted electronic vacuum switches has a parts control ...
(9) Function
AIRTEC Classic ejectors work according to the Venturi principle. Air compressed between 4 and 6 bar, which is as dirt and oil free as possible, flows through the Venturi nozzle (B) via the compressed air supply (A); this is protected against large particles of dirt by a protective filter.
As a result of the flow cross-section in the nozzle being narrowed considerably, the flow velocity increases to the supersonic level.
In the mixing chamber (C), the quick-moving air jet hits the atmospheric air of the vacuum line (D) and whisks this along into the up-take nozzle (E), also known as a diffuser.
In this process, the required negative pressure is creating vacuum. A protective filter in the vacuum connection ...
The Concept
The column ejector get it’s name from it’s cylindrical geometry. The pressure supply is introduced radially on the ejector body and routed internally into the center of the ejector. The air flow is directed downwards through an orifice to a baffle plate and is accelerated radially in all directions until the desired sub- or supersonic speed is obtained at the point of ejection 1. At this point the air expands and vacuum is created (Venturi principle). At point 2, the accelerated air flow is mixed with the drawn air. At point 3, the air speed is reduced and flows direct ly upward through a silencer to atmosphere. Several vacuum ports are positioned around the outer diameter into point 2, to connect several vacuum cups on one ejector.
The vacuum is maintained on all ports, even in cases where one or several cups draws to atmospheric pressure. Additional valves or pressure control are not required. This increases operating safety while reducing start-up costs.
The new body design makes the ejector highly efficient. In vacuum ranges above 40 %, the column ejector achieves a performance, at equal air consumption, that can only be matched by multistage vacuum ejectors. The compact form, along with its lightweight design, provides for new application possibilities in the area of vacuum technology.
(420) Design and function
The central ejector is based on the Venturi principle. It is mounted on a RF- manifold system. A double 3/2-way pilot valve, type BM-01-310/2-HN, provides the control of the vacuum and blow off port.
The unit is available as single ejector and can be extended up to 6 stations. 3 different flow sizes are available. Scope of delivery: Acetal-resin silence with self-cleaning granulate filling.
Design and function
These calibrated and temperature-compensated sensors deliver extremely accurate measurements. There are two programmable switchpoints ready to be processed.
The switching points and the hystereses are adjustable.
The “adjustable output” functions are distinguished by a red and a green LED.
The sensors are user friendly and can be easily re-configured for special applications.
We have been designing and manufacturing pneumatic components in Germany for more than 36 years. These pneumatic components are in sold and serviced through our worldwide distribution network. Clients from all industries put their trust in Airtec quality-from standard machinery and processing industries to robotics, high-tech machine tools, aerospace and semi conductor industries.