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How Do Mono-Type Pumps Work?

December 1, 2017

Named after the French inventor, René Moineau, Mono-Type Pumps are known for certain special flow characteristics. The proprietary drive mechanism inside this pump features pulse-free fluid conveyance, plus a knack for discharging that fluid medium at a truly constant rate. A worthy mention is also reserved for a handy mix-sensitive attribute, a feature that benefits the food and pharmaceutics sector. Assuredly utilisable, just how do mono-type pumps work?

The Wavelength Delivery System

Take a look at the ocean, the way each individual wave rolls into shore. Wouldn't it be helpful if we could harness that power? Well, mono-type pumps accomplish this feat quite handily. Only, instead of rolling waves, it's the helical relationship established by a metal rotor and an elastomeric stator that sets the fluid in motion. Trapped in the discrete helical runs that form cavities between the rotor and stator, those sealed pockets are displaced or pumped down the length of a tubular housing. It's because of those seals, the travelling cavities, that this pumping solution is used in systems where chemicals and food ingredients must be kept separate. Back at that elastomeric stator, this reverse corkscrew lining typically uses an internal geography that doubles the oscillating channels found on the helically shaped rotor.

Acting as a Visco-Elastic Piston

Despite the fact that this is a positive displacement process, there are no fast-moving parts in evidence within this mechanism. No, if this equipment could be compared to any other type of pump, it would be the piston systems that still prosper in many industrial applications. In effect, the wavelength of the stator interacts with the opposing wavelength on the nickel-plated rotor. Like the waves we first compared this principle to, the discrete fluid pockets roll forward as an elastomeric impelled mass. Aided by an eccentrically mounted drive shaft, the operational characteristics of the mono-type pump are easy enough to discern. Among them, the ability to transport mix-agnostic packets of thick or gooey fluid at a low speed top the list. Again, this particular feature suggests a shear-sensitive application, such as a treacle production facility, but then there are sewage plants, gypsum and silicate slurries, and many other usage areas.

In the past, we've described rotor and stator issues, plus the commonest issues that trouble this specialised pumping gear. However, sometimes we need to peel away the parts so that we can see the fluid conveyance principles in motion. Like a corkscrew, the mono-type pump uses an intelligently designed relationship between the solid rotor and the flexible stator. Working with the eccentrically mounted drive shaft, the wavelengths built into those two rotating screws impels a pulse-less series of discrete fluid pockets forward.

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