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Air Jets and Nozzles Overview

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A simple solution to excessive air consumption and noise level on compressed air "blowoff" operations. Using a small amount of compressed air as a power source, Air Jets and Nozzles produce outlet flows up to 25 times compressed air consumption. Air savings, compared to open copper tubes or pipe nipples commonly used for blowoff can be as high as 80%. Less compressed air means less noise – typical noise level reduction is 10 dBA. All Air Jets and Nozzles meet OSHA maximum dead-ended pressure requirements.

An open 1/4" (6mm) copper tube, by contrast, ejects pure compressed air at up to 40 standard cubic feet per minute (1133 SLPM), the entire output of a 10 horsepower compressor. Annual energy cost can exceed $1,000 per year. Noise levels in excess of 100 dBA are commonly produced. When supply pressure exceeds 30 PSIG (2 BAR), an open jet violates OSHA static pressure requirements.

Reduce noise level and air cost on blowoff operations.

Applications   Advantages
rd_ball.gif (946 bytes) Part cleaning   rd_ball.gif (946 bytes) Reduced compressed air cost
rd_ball.gif (946 bytes) Chip removal   rd_ball.gif (946 bytes) 10 dBA average noise reduction
rd_ball.gif (946 bytes) Part drying   rd_ball.gif (946 bytes) Improved blowoff performance
rd_ball.gif (946 bytes) Liquid blowoff   rd_ball.gif (946 bytes) Compact
rd_ball.gif (946 bytes) Part cooling   rd_ball.gif (946 bytes) Meet OSHA noise level requirements
rd_ball.gif (946 bytes) Material conveying   rd_ball.gif (946 bytes) Meet OSHA dead-end pressure requirements
rd_ball.gif (946 bytes) Part ejection      
rd_ball.gif (946 bytes) Fiber conveying      
rd_ball.gif (946 bytes) Air assist      
How Air Jets and Nozzles Work
Air Jets utilize the coanda effect (wall attachment of a high velocity fluid) to produce air motion in their surroundings. As illustrated at bottom right, a small amount of compressed air is throttled through an internal ring nozzle above sonic velocity. A vacuum is produced, pulling large volumes of surrounding, or "free" air, through the jet. Air Jets produce the highest force to air consumption ratio of all EXAIR blowoff products, making them the most economical choice for "tough" applications such as part ejection or chip removal. Both the outlet and inlet can be ducted for remote positioning. If the end is blocked, flow simply reverses at well below OSHA static pressure requirements.

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Open Jet

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Air Jet

Air Nozzles also use the coanda effect to amplify compressed airflow 25 times or more. As illustrated to the right, compressed air is ejected through a thin ring nozzle. As this ring of air travels along the outer wall of the nozzle, surrounding air is entrained into the stream. This entrained airstream combines with the air ejected from the center hole to produce a high volume, high velocity blast of air – at minimal consumption. The slotted end allows air to vent safely should the nozzle end be blocked.

Both Air Jets and Nozzles are easily retrofitted to existing blowoffs, and are available in adjustable or non-adjustable versions.

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Air Nozzle

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A Model 1009 Adjustable Nozzle
reduces air use and improves
performance of a blowgun.

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A Model 1005 Air Nozzle blows
trim away from a forming die.

 

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Last modified: May 08, 2000

 

 

 
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