Shaft coupling used for aerator device in oxygenation of water

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One-piece helical beam stainless steel construction needs no lubrication and does not suffer from oxidation, and increases aeration rate by 30 per cent

Shaft coupling used for aerator device in oxygenation of waterThe challenge for Abssac was to develop a flexible shaft coupling that could be used in the drive assembly of a ‘aerator’ used in the oxygenation of water in fish spawning ponds and small lakes. Aeration is especially required in times of hot weather where the oxygen concentration within the water can fall and have a detrimental effect on spawning.

The old procedure involved a fast rotating agitating propeller, placed below the surface of the water, while compressed air was simultaneously piped to just behind the rotating propeller to allow a mix and aeration to take place. Although this original process did work, it was not very efficient as the air hose would often move from the optimum position, requiring constant maintenance and monitoring during operation. In the original design, the immersed propeller was driven via shafting and a series of ‘cardan-style’ u-joints, which also required an environmentally friendly lubrication.

Abssac was approached by the manufacturer to look at a solution to replace the universal joints where no lubrication would be required.

However, it was quickly realised that the drive offered by Abssac could also aid in the quest to improve aeration. The helical beam coupling by design has a hollow centre, and this proved to be a big advantage to the application. The final design of stainless steel shaft coupling could not only handle the angular offset and torque required, but cleverly would allow a compressed air tube to be fed through the middle so that oxygen could directly be fed to the middle of the agitating propeller. The end result increased aeration rate by 30 per cent.

Moreover, the single piece U-joint design also supported the propeller shaft at the motor end, eliminating the need for a bearing. In addition, its one-piece stainless steel construction did not need lubrication or suffer from oxidation.

To find out more about Abssac's flexible shaft couplings and other products, visit the website at

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