CPAP Centrifugal Blowers  

The Secret of the the "Turtle Blower"

Originally developed especially for respiration devices, the “Turtle Blower” (ebm-papst partnumber ECI 30.20) has since become established as a robust universal genius. The housing is what gave the Turtle Blower its nickname. The small black plastic case with the five screw bosses and the blower outlet are reminiscent of a small turtle.

The compact blower was developed for medical respiration aids. It supports patients suffering from irregular breathing by ensuring that they have sufficient air supply. As the device is used right next to the patient’s bed, the little turtle has to be mainly capable of two things. Firstly, it has to be very quiet, and secondly it has to respond dynamically and positively to the patient’s respiration requirements. But it can do a lot more than just that.

With a diameter of just under seven centimeters, the Turtle Blower is a mighty midget.

For use in CPAP respiration devices, the blower has to satisfy specific requirements. It supports the body’s respiratory reflexes with a controlled supply of air. Its air flow and pressure must be continually adapted to the patient’s own breathing. The blower drive must therefore be able to adjust its speed with extreme flexibility. The development engineers at ebm-papst designed the blower to be suitably dynamic for a maximum operating point at which a pressure variation of four to 20 millibars is possible within the space of 200 milliseconds.

The universal genius generates adequate pressure for these applications:

Quiet, robust and inexpensive

Yet, nobody is awoken by a howling motor. The Turtle Blower’s noise level of 40 dB(A) acoustic pressure makes it rather a quiet companion. This is also the result of its smooth-running design, which generates extremely low levels of vibration. In respiration devices, the blower is given additional damping and is encased in a foam cage within a soundproof box. The air intake and outlet ducts meander like an exhaust system for optimum noise minimization. The result is that the Breas iSleep device, for example, has a noise level of just 21 dB(A) acoustic power – perfect for a good night’s sleep. The engineers at ebm-papst achieved the smoothness with which the blower runs by using an iron-free motor. Air coils are used instead of stator teeth. This means that the motor has no magnetic resistance, generates less structure-borne noise and has lower power loss. Because the EC technology employed has no brushes (wearing parts), the blower lives