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AVAC Vakuumteknik AB – Specialized in vacuum ejectors
We are specialists when it comes to vacuum ejectors, automation and material handling since the beginning of 80’s. We have sincere knowledge and experience in the vacuum field where we offer standard and customized solutions.Our product development is focused around the process of air tightning material such as sheet or glas and for Pick & Place applications.
Ejectors for generating vacuum and sensors for monitoring vacuum
We developed vacuum ejectors for effective vacuum generation. We offer both standard products and customized solutions. We also have vacuum sensors for monitoring your automated processes. You can read more about our vacuum ejectors here on our website or by downloading our catalogue and brochures.
Award-winning vacuum ejectors
Our multi circuit ejectors has seperate vacuum circuits and a common blow-off with AVAC Monitoring System (AMS). Our multi circuit ejector has also been awarded the innovation award “Award for Blech Expo” for the most innovative product in handling- and robot technology.
Our vacuum ejectors are based on the venturi principle
Our ejectors operate by the venturi principle which means that compressed air is led in through a primary nozzle where it is blown to a secondary nozzle which draws the air from the vacuum connection. Depending on the nozzle design different vacuum levels can be obtained. Our standard ejectors are designed so that the levels can be achieved according to the curve on page 8. This design of the ejector has the benefit of no moving parts and are easy to build in thanks to small dimensions.
Physically, this is described as: Venturi effect is the decrease in fluid pressure that results when a fluid flows through a constricted part of the tube. The effect is named after the Italian physicist Giovanni Batista Venturi (1746-1822). The ejectors lead the compressed air in through the primary nozzle where it is expanded and the compressed air energy is converted into kinetic energy. The air jet speed increases, the temperature and the pressure decreases in the vacuum connection. The advantages of the Venturi principle is that there are no moving parts, has small dimensions, low maintenance cost and rapid response.
Vacuum is produced
The ejector is supplied with compressed air which is led through the primary nozzle and blown to the secondary nozzle, drawing the air from the vacuum connection where vacuum is achieved. The Release Phase When the solenoid valve is actuated, compressed air is blown through the Jet Nozzle linking off the air from the primary nozzle into the vacuum connection. Additionally air is withdrawn through the exhaust. At the beginning, the withdrawn air signifies the major part of the blow-off. When the vacuum level gradually is sinking the withdrawn air loses importance. At atmospheric pressure only the flow through the jet- and primary nozzles remain.
It means that the total Blow-off flow is: The Ejector flow + the flow of the solenoid valve + air withdrawn through the exhaust.
Our ejectors are designed to produce a high vacuum level and the nozzles design provide very low air consumption. To get the lowest air consumption possible our nozzles are designed for an optimum supply pressure of 4 bar . A higher pressure will not achieve a higher vacuum, but only result in much higher air consumption and higher noise levels from the ejector.