posted on 2014-08-06, 00:00authored byMichael Loepfe, Christoph M. Schumacher, Wendelin J. Stark
We present a design and parameter
study on 3D-printed, lost-wax-casted
and combustion-powered soft silicone pumps, which are internally cooled
by the conveyed liquid. Important factors influencing the pumping
performance such as gas mixtures, feed rates, and actuation frequencies
were thoroughly studied. Furthermore, we reinforced some of the here
presented pumps with aramid fabrics in order to achieve partial blocking
of the elastomeric flexibility upon combustion expansion. This design
measure dramatically increased the pumping capabilities and allowed
continuous conveying of water to 13 m (corresponding to 42 ft) of
height. We were able to stably operate these novel pumps for more
than 30 000 combustion cycles.
Therefore, they represent a further step toward long-term stable soft
machines with dense power characteristics.